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Bakhtiaridoost S, Musuroi C, Volmer M, Florescu M. Optoelectronic microfluidic device for point-of-care blood plasma viscosity measurement. LAB ON A CHIP 2024; 24:3305-3314. [PMID: 38869225 DOI: 10.1039/d4lc00211c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2024]
Abstract
Physical properties of blood plasma, such as viscosity, serve as crucial indicators of disease. The inherent capillary effect of paper microchannels, coupled with minimal sample requirement, stimulated the advancement of paper-based viscometers. This study presents a precise, non-contact optoelectronic system using a microfluidic platform for the measurement of blood plasma viscosity. Microchannels were defined onto the filter paper using an available and inexpensive wax crayon, without the need for conventional wax printing equipment. The time required for the 5 μL sample to pass a specific distance was measured using two pairs of infrared sensors. Subsequently, this data was sent to the microcontroller, which automatically calculated the viscosity. Throughout the measurements, sample temperature was maintained at a constant 37 °C through an integrated heater with automated control. The microfluidic platform successfully processed real samples, yielding viscosity measurements in under three minutes. Evaluation with fetal bovine serum, spiked with varying protein concentrations in both native and denatured states, demonstrated a precision exceeding 96% compared to conventional Ostwald viscometer readings. For human subjects exhibiting pathologies affecting serum and plasma viscosity compared to physiological norms, strong correlations were observed between resultant values and clinical diagnoses. The proposed device aims to replace expensive and complex optical equipment, offering a safer alternative for measuring plasma viscosity. Unlike similar devices, it eliminates the risk of component deformation due to chemical contact or unsafe irradiation.
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Affiliation(s)
- Somayyeh Bakhtiaridoost
- Department of Fundamental, Prophylactic and Clinical Disciplines, Faculty of Medicine, Transilvania University of Brasov, Brasov, Romania.
| | - Cristian Musuroi
- Department of Electrical Engineering and Applied Physics, Transilvania University of Brasov, Brasov, Romania.
| | - Marius Volmer
- Department of Electrical Engineering and Applied Physics, Transilvania University of Brasov, Brasov, Romania.
| | - Monica Florescu
- Department of Fundamental, Prophylactic and Clinical Disciplines, Faculty of Medicine, Transilvania University of Brasov, Brasov, Romania.
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Lee K, Han J. Analysis of the urine flow characteristics inside catheters for intermittent catheter selection. Sci Rep 2024; 14:13273. [PMID: 38858470 PMCID: PMC11164700 DOI: 10.1038/s41598-024-64395-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2023] [Accepted: 06/07/2024] [Indexed: 06/12/2024] Open
Abstract
In this study, we conducted a numerical analysis on catheter sizes using computational fluid dynamics to assess urinary flow rates during intermittent catheterization (IC). The results revealed that the fluid (urine) movement within a catheter is driven by intravesical pressure, with friction against the catheter walls being the main hindrance to fluid movement. Higher-viscosity fluids experienced increased friction with increasing intravesical pressure, resulting in reduced fluid velocity, whereas lower-viscosity fluids experienced reduced friction under similar pressure, leading to increased fluid velocity. Regarding urine characteristics, the results indicated that bacteriuria, with lower viscosity, exhibited higher flow rates, whereas glucosuria exhibited the lowest flow rates. Additionally, velocity gradients decreased with increasing catheter diameters, reducing friction and enhancing fluid speed, while the friction increased with decreasing diameters, reducing fluid velocity. These findings confirm that flow rates increased with larger catheter sizes. Furthermore, in terms of specific gravity, the results showed that a 12Fr catheter did not meet the ISO-suggested average flow rate (50 cc/min). The significance of this study lies in its application of fluid dynamics to nursing, examining urinary flow characteristics in catheterization. It is expected to aid nurses in selecting appropriate catheters for intermittent catheterization based on urinary test results.
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Affiliation(s)
- Kyeongeun Lee
- College of Nursing Science, Kyung Hee University, Seoul, Republic of Korea
| | - Jeongwon Han
- College of Nursing Science, Kyung Hee University, Seoul, Republic of Korea.
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3
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Erstling JA, Bag N, Gardinier TC, Kohle FFE, DomNwachukwu N, Butler SD, Kao T, Ma K, Turker MZ, Feuer GB, Lee R, Naguib N, Tallman JF, Malarkey HF, Tsaur L, Moore WL, Chapman DV, Aubert T, Mehta S, Cerione RA, Weiss RS, Baird BA, Wiesner UB. Overcoming Barriers Associated with Oral Delivery of Differently Sized Fluorescent Core-Shell Silica Nanoparticles. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2305937. [PMID: 37689973 DOI: 10.1002/adma.202305937] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2023] [Revised: 09/07/2023] [Indexed: 09/11/2023]
Abstract
Oral delivery, while a highly desirable form of nanoparticle-drug administration, is limited by challenges associated with overcoming several biological barriers. Here, the authors study how fluorescent and poly(ethylene glycol)-coated (PEGylated) core-shell silica nanoparticles sized 5 to 50 nm interact with major barriers including intestinal mucus, intestinal epithelium, and stomach acid. From imaging fluorescence correlation spectroscopy studies using quasi-total internal reflection fluorescence microscopy, diffusion of nanoparticles through highly scattering mucus is progressively hindered above a critical hydrodynamic size around 20 nm. By studying Caco-2 cell monolayers mimicking the intestinal epithelia, it is observed that ultrasmall nanoparticles below 10 nm diameter (Cornell prime dots, [C' dots]) show permeabilities correlated with high absorption in humans from primarily enhanced passive passage through tight junctions. Particles above 20 nm diameter exclusively show active transport through cells. After establishing C' dot stability in artificial gastric juice, in vivo oral gavage experiments in mice demonstrate successful passage through the body followed by renal clearance without protein corona formation. Results suggest C' dots as viable candidates for oral administration to patients with a proven pathway towards clinical translation and may generate renewed interest in examining silica as a food additive and its effects on nutrition and health.
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Affiliation(s)
- Jacob A Erstling
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY, 14853, USA
- Department of Biomedical Engineering, Cornell University, Ithaca, NY, 14853, USA
| | - Nirmalya Bag
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY, 14853, USA
| | - Thomas C Gardinier
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY, 14853, USA
| | - Ferdinand F E Kohle
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY, 14853, USA
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY, 14853, USA
| | - Naedum DomNwachukwu
- Department of Biomedical Engineering, Cornell University, Ithaca, NY, 14853, USA
| | - Scott D Butler
- Department of Biomedical Sciences, Cornell University, Ithaca, NY, 14853, USA
| | - Teresa Kao
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY, 14853, USA
| | - Kai Ma
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY, 14853, USA
| | - Melik Z Turker
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY, 14853, USA
| | - Grant B Feuer
- Department of Biomedical Engineering, Cornell University, Ithaca, NY, 14853, USA
| | - Rachel Lee
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY, 14853, USA
| | - Nada Naguib
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY, 14853, USA
- Department of Biomedical Engineering, Cornell University, Ithaca, NY, 14853, USA
| | - James F Tallman
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY, 14853, USA
| | - Henry F Malarkey
- Department of Applied and Engineering Physics, Cornell University, Ithaca, NY, 14853, USA
| | - Lieihn Tsaur
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY, 14853, USA
| | - William L Moore
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY, 14853, USA
| | - Dana V Chapman
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY, 14853, USA
| | - Tangi Aubert
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY, 14853, USA
| | - Saurabh Mehta
- Center for Precision Nutrition and Health, Division of Nutritional Sciences, Cornell University, Ithaca, NY, 14853, USA
| | - Richard A Cerione
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY, 14853, USA
| | - Robert S Weiss
- Department of Biomedical Sciences, Cornell University, Ithaca, NY, 14853, USA
| | - Barbara A Baird
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY, 14853, USA
| | - Ulrich B Wiesner
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY, 14853, USA
- Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, NY, 14853, USA
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Wang X, Liu P, Zhao S, Wang F, Li X, Wang L, Yan Y, Zou GA, Xu G. Dynamic simulation and analysis of the influence of urethral morphological changes on urodynamics after benign prostatic hyperplasia surgery: A computational fluid dynamics study. COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE 2024; 243:107915. [PMID: 37995487 DOI: 10.1016/j.cmpb.2023.107915] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2023] [Revised: 10/31/2023] [Accepted: 11/03/2023] [Indexed: 11/25/2023]
Abstract
BACKGROUND AND OBJECTIVE Computational fluid dynamics (CFD) technology has been widely used in medicine to simulate and analyse urine flow characteristics in urology. In previous studies, researchers have modelled the analysis with a simple circular urethra, ignoring the effect of the patient's true urethral morphology on the urinary flow rate. Moreover, the studies tended to be steady-state simulations rather than dynamic simulations. Therefore, this study is established a relatively realistic model of the posterior urethra based on MRI data combined with the urodynamic data of patients and analysed the urodynamic characteristics of the posterior urethra model after benign prostatic hyperplasia (BPH) surgery using a CFD dynamic simulation. METHODS Based on clinical MRI data, a three-dimensional real urethral model was established for two patients with BPH after surgery. The boundary conditions were set according to the patients' real urodynamic data, and a Reynolds averaged Navier‒Stokes model was used for transient simulations. The dynamic simulation depicted the entire urination process, and the urine flow characteristics were studied under real urethral morphology after surgery. RESULTS 1. By comparing the three-dimensional trajectory of urine and the vortex identification cloud map based on the Q criterion, we intuitively observed the distribution of the vortex in the model, and a 'gourd-shaped' urethra was more likely to generate a vortex than a 'funnel-shaped' urethra. 2. After surgery for BPH, the changes in the posterior urethral pressure were mainly concentrated in the urethral membrane, and the velocity increased while the pressure decreased. The curve of the posterior urethral pressure changes during urination was simulated and calculated. The posterior urethral pressure gradients of the two patients were 6.6 cmH2O and 5.26 cmH2O. CONCLUSIONS The complete urinary discharge process can be dynamically simulated using CFD techniques. By comparing the simulation results, the posterior urethral morphology can have an important impact on the urinary flow characteristics. Determining the location of vortex generation can lay a foundation for personalized surgical plans for patients in the future. Furthermore, numerical simulations can provide a new method for the study of non-invasive posterior urethral pressure gradients.
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Affiliation(s)
- Xihao Wang
- Department of Urology, The First Affiliated Hospital of Henan University, Kaifeng, China
| | - Pengyue Liu
- Department of Urology, The First Affiliated Hospital of Henan University, Kaifeng, China
| | - Sen Zhao
- Department of Medical Imageology, The First Affiliated Hospital of Henan University, Kaifeng, China
| | - Fei Wang
- Department of Urology, The First Affiliated Hospital of Henan University, Kaifeng, China
| | - Xiaodong Li
- Department of Urology, The First Affiliated Hospital of Henan University, Kaifeng, China
| | - Lianqu Wang
- Department of Urology, The First Affiliated Hospital of Henan University, Kaifeng, China
| | - Yongjun Yan
- Department of Urology, The First Affiliated Hospital of Henan University, Kaifeng, China
| | - Guang-An Zou
- School of Mathematics and Statistics Henan University, Kaifeng, China
| | - Guoliang Xu
- Department of Urology, The First Affiliated Hospital of Henan University, Kaifeng, China.
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Guan X, Lu D, Chen Z, Wang Z, Zhou G, Fan Y. Non-invasive detection of bladder cancer via microfluidic immunoassay of the protein biomarker NMP22. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2023. [PMID: 37377044 DOI: 10.1039/d3ay00664f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/29/2023]
Abstract
Bladder cancer (BC) is a malignant tumor that occurs in the bladder mucosa and has a high morbidity and mortality rate. Early diagnosis means that cystoscopy-aided imaging is invasive and pricey. Microfluidic immunoassay enables noninvasive detection of early BC. However, its clinical applications are limited due to the poor internal design and hydrophobic surface of polydimethylsiloxane (PDMS) chip. This study aims to design a PDMS chip with right-moon capture arrays and prepare a hydrophilic surface by APTES with different concentrations (PDMS-three-step: O2 plasma-5-98% APTES), which facilitates early detection of BC with enhanced sensitivity. Simulations showed that the right-moon arrays in the capture chamber reduced the flow velocity and shear stress of the target molecule NMP22, improving the capture performance of the chip. PDMS-three-step surface was measured by X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), contact angle, and antibody immobilization. The results displayed that the contact angle of PDMS-three-step remained in the range of 40° to 50° even after 30 days of exposure to air, leading to a more stable hydrophilic surface. The effectiveness of the PDMS chip was assessed via the quantitative immunoassay of the protein marker NMP22 and its sensitivity analysis to urine. After the assessment, the LOD of NMP22 was 2.57 ng mL-1, and the sensitivity was 86.67%, which proved that the PDMS chip was effective. Thus, this study provided a novel design and modification method of the microfluidic chip for the early detection of BC.
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Affiliation(s)
- Xiali Guan
- School of Biological Science and Medical Engineering, Beihang University, Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, Beijing 100083, China.
| | - Da Lu
- School of Biological Science and Medical Engineering, Beihang University, Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, Beijing 100083, China.
| | - Zhigang Chen
- School of Biological Science and Medical Engineering, Beihang University, Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, Beijing 100083, China.
| | - Zhuya Wang
- School of Biological Science and Medical Engineering, Beihang University, Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, Beijing 100083, China.
| | - Gang Zhou
- School of Biological Science and Medical Engineering, Beihang University, Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, Beijing 100083, China.
- Shenzhen Research Institute, Beihang University, Shenzhen, 518057, China
| | - Yubo Fan
- School of Biological Science and Medical Engineering, Beihang University, Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, Beijing 100083, China.
- Shenzhen Research Institute, Beihang University, Shenzhen, 518057, China
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Mascolini MV, Fontanella CG, Berardo A, Carniel EL. Influence of transurethral catheters on urine pressure-flow relationships in males: A computational fluid-dynamics study. COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE 2023; 238:107594. [PMID: 37207463 DOI: 10.1016/j.cmpb.2023.107594] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2023] [Revised: 04/27/2023] [Accepted: 05/08/2023] [Indexed: 05/21/2023]
Abstract
BACKGROUND AND OBJECTIVE In the field of urology, the pressure-flow study (PFS) is an essential urodynamics practise which requires the patient's transurethral catheterization during the voiding phase of micturition to evaluate the functionality of the lower urinary tract (LUT) and reveal the pathophysiology of its dysfunctionality. However, the literature evidences confusion regarding the interference of the catheterization on the urethral pressure-flow behaviour. METHODS The present research study represents the first Computational Fluid-Dynamics (CFD) approach to this urodynamics issue, analysing the influence of a catheter in the male LUT through case studies which included the inter-individual and intra-individual dependence. A set of four three dimensional (3D) models of the male LUT, different in urethral diameters, and a set of three 3D models of the transurethral catheter, diverse in calibre, were developed leading to 16 CFD non-catheterized either catheterized configurations, to describe the typical micturition scenario considering both urethra and catheter characteristics. RESULTS The developed CFD simulations showed that the urine flow field during micturition was influenced by the urethral cross-sectional area and each catheter determined a specific decrease in flow rate if compared to the relative free uroflow. CONCLUSIONS In-silico methods allow to analyse relevant urodynamics aspects, which could not be investigated in vivo, and may support the clinical PFS to reduce uncertainty on urodynamic diagnosis.
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Affiliation(s)
- Maria Vittoria Mascolini
- Department of Industrial Engineering, University of Padova, Padova, Italy; Centre of Mechanics of Biological Materials, University of Padova, Padova, Italy
| | - Chiara Giulia Fontanella
- Department of Industrial Engineering, University of Padova, Padova, Italy; Centre of Mechanics of Biological Materials, University of Padova, Padova, Italy
| | - Alice Berardo
- Centre of Mechanics of Biological Materials, University of Padova, Padova, Italy; Department of Civil, Environmental and Architectural Engineering, University of Padova, Padova, Italy; Department of Biomedical Sciences, University of Padova, Padova, Italy.
| | - Emanuele Luigi Carniel
- Department of Industrial Engineering, University of Padova, Padova, Italy; Centre of Mechanics of Biological Materials, University of Padova, Padova, Italy
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Cimier A, Thach S, Lacroix B, Mariat C. [Evaluation of the efficacy and safety of HIVEC intravesical thermochemotherapy with intermediate-risk and high-risk non-muscle-invasive bladder cancer]. Prog Urol 2023; 33:254-264. [PMID: 36906430 DOI: 10.1016/j.purol.2023.02.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Revised: 10/25/2022] [Accepted: 02/16/2023] [Indexed: 03/11/2023]
Abstract
INTRODUCTION Non-muscle-infiltrating cancers (NMIBC) represent 75% of bladder tumors. The objective of our study is to report a single-center experience of the efficacy and tolerability of HIVEC on intermediate- and high-risk NMIBC in adjuvant therapy. MATERIAL AND METHOD Between December 2016 and October 2020, patients with intermediate-risk or high-risk NMIBC were included. They were all treated with HIVEC as an adjuvant therapy to bladder resection. Efficacy was assessed by endoscopic follow-up and tolerance by a standardized questionnaire. RESULTS A total of 50 patients were included. The median age was 70years (34-88). The median follow-up time was 31 months (4-48). Forty-nine patients had cystoscopy as part of the follow-up. Nine recurred. One patient progressed to Cis. The 24-month recurrence-free survival was 86.6%. There were no severe adverse events (grade 3 or 4). The ratio of delivered instillations to planned instillations was 93%. CONCLUSION HIVEC with the COMBAT system is well tolerated in adjuvant treatment. However, it is not better than standard treatments, especially for intermediate-risk NMIBC. While waiting for recommendations, it cannot be proposed as an alternative to standard treatment. LEVEL OF EVIDENCE: 2
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Affiliation(s)
- A Cimier
- Service d'urologie, CHU de Saint-Étienne, hôpital Nord, 42055 Saint-Étienne, France.
| | - S Thach
- Service d'urologie, clinique Mutualiste, 3, rue Le Verrier, 42000 Saint-Étienne, France
| | - B Lacroix
- Service d'urologie, clinique Mutualiste, 3, rue Le Verrier, 42000 Saint-Étienne, France
| | - C Mariat
- Service d'urologie, CHU de Saint-Étienne, hôpital Nord, 42055 Saint-Étienne, France
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Zarrinchang P, Ashrafizaadeh M, Jamshidi N. Simulation of the female pelvic mobility and vesical pressure changes employing fluid-structure interaction method. Int Urogynecol J 2023; 34:571-580. [PMID: 36169682 DOI: 10.1007/s00192-022-05362-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Accepted: 09/05/2022] [Indexed: 01/26/2023]
Abstract
INTRODUCTION AND HYPOTHESIS This study aims to develop a fluid-structural interaction (FSI) method to pinpoint the effects of pressure changes inside the bladder and their impact on the supporting structure and the urethra mobility. METHODS A physiological model of the nulliparous female pelvis, including the organs, supportive structures, and urine, was developed based on magnetic resonance images. Soft tissues with nonlinear hyperelastic material characteristics were modeled. The Navier-Stokes equations governing the fluid flow within the computational domain (urine) were solved. The urine and soft tissue interactions were simulated by the FSI method. The vesical pressure and its impact on the urethral mobility and supportive structures were investigated during the Valsalva maneuver. Moreover, the simulation results were validated by comparing with a urodynamic test and other research. RESULTS The results demonstrated that the vesical pressure simulated by the FSI method could predict the nonlinear behavior of the urodynamic test pressure. The urethra retropubic bladder neck and the bladder neck-pubic bone angle changed 58.92% and -55.76%, respectively. The retropubic urethral length distance changed by -48.74%. The error compared to the statistical results of other research is < 5%. CONCLUSIONS The total deformation and mobility of the urethra predicted by the FSI model were consistent with clinical observations in a subject. The urethra supports dependence on the tissues' mechanical properties, interaction between the tissues, and effect of urine fluid inside the bladder. This simulation effectively depicts the patterns of urethra mobility, which provides a better understanding of the behavior of the pelvic floor.
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Affiliation(s)
- Pouya Zarrinchang
- Mechanical Engineering group, Pardis College, Isfahan University of Technology, Isfahan, 84156-83111, Iran
| | - Mahmud Ashrafizaadeh
- Department of Mechanical Engineering, Isfahan University of Technology, Isfahan, 84156-83111, Iran.
| | - Nima Jamshidi
- Department of Biomedical Engineering, Faculty of Engineering, University of Isfahan, Isfahan, Iran
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Xu Z, Yue P, Feng JJ. Poroelastic modelling reveals the cooperation between two mechanisms for albuminuria. J R Soc Interface 2023; 20:20220634. [PMID: 36628531 PMCID: PMC9832287 DOI: 10.1098/rsif.2022.0634] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2022] [Accepted: 12/08/2022] [Indexed: 01/12/2023] Open
Abstract
Albuminuria occurs when albumin leaks abnormally into the urine. Its mechanism remains unclear. A gel-compression hypothesis attributes the glomerular barrier to compression of the glomerular basement membrane (GBM) as a gel layer. Loss of podocyte foot processes would allow the gel layer to expand circumferentially, enlarge its pores and leak albumin into the urine. To test this hypothesis, we develop a poroelastic model of the GBM. It predicts GBM compression in healthy glomerulus and GBM expansion in the diseased state, essentially confirming the hypothesis. However, by itself, the gel compression and expansion mechanism fails to account for two features of albuminuria: the reduction in filtration flux and the thickening of the GBM. A second mechanism, the constriction of flow area at the slit diaphragm downstream of the GBM, must be included. The cooperation between the two mechanisms produces the amount of increase in GBM porosity expected in vivo in a mutant mouse model, and also captures the two in vivo features of reduced filtration flux and increased GBM thickness. Finally, the model supports the idea that in the healthy glomerulus, gel compression may help maintain a roughly constant filtration flux under varying filtration pressure.
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Affiliation(s)
- Zelai Xu
- Department of Chemical and Biological Engineering, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z2
| | - Pengtao Yue
- Department of Mathematics, Virginia Tech, Blacksburg, VA 24061, USA
| | - James J. Feng
- Department of Chemical and Biological Engineering, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z2
- Department of Mathematics, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z2
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10
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Jang KS, Kim JW, Ryu J. Numerical investigation of urethra flow characteristics in benign prostatic hyperplasia. COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE 2022; 224:106978. [PMID: 35797748 DOI: 10.1016/j.cmpb.2022.106978] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2021] [Revised: 04/05/2022] [Accepted: 06/25/2022] [Indexed: 06/15/2023]
Abstract
BACKGROUND AND OBJECTIVE Conventional practice includes a limited depiction of urethral pressure and flows based on fragmented gross clinical observations. However, with technological advancements in simulations, computational fluid dynamics (CFD) can provide an alternative approach to predict the bladder pressure with a concordant quantitative flow field in the urethra. Thus, this study aims to comprehensively analyze the urine flow characteristics in various urethra models using simulations. METHODS Three-dimensional urethra models were constructed for seven specific subjects based on clinical radiographs. Simulations with Reynolds averaged Navier-Stokes model were performed to quantitatively investigate the urine flow under various volume flow rate of voided urine. RESULTS Under benign prostatic hyperplasia, the spindle shape of the prostatic urethra (PRU) generates wake flow. The wake flow was also observed in several regions downstream of the PRU, depending on the urethra shape. This wake flow resulted in total pressure loss and urinary tract dysfunction. When comparing pre- and post-operative urethra models, the bladder pressure decreased by 14.98% in P04 and 4.67% in P06. Thus, we identified variability between surgical results of patients. The bladder pressure according to the volume flow rate of voided urine was investigated using simulations and the theoretical consideration based on hydrodynamics. In theoretical consideration, the bladder pressure was expressed as a second-order polynomial for volume flow rate. These results concur with the simulation results. CONCLUSION Numerical simulation can describe the urine flow field in the urethra, providing the possibility to predict the bladder pressure without requiring painful, invasive interventions, such as cystoscopy. Furthermore, effective treatments to improve urination function can be formulated to be patient-specific, by detecting causes and problem regions based on quantitative analysis and predicting post-surgical outcomes.
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Affiliation(s)
- Kyeong Sik Jang
- PKG Design Team, Test& System Package (TSP), Samsung Electronics, Gyeonggi-do 18448, Republic of Korea
| | - Jin Wook Kim
- Department of Urology, Chung-Ang University, Seoul 06974, Republic of Korea; Biomedical Research Institute, Chung-Ang University Hospital, Seoul 06973, Republic of Korea.
| | - Jaiyoung Ryu
- Department of Mechanical Engineering, Chung-Ang University, Seoul 06974, Republic of Korea; Department of Intelligent Energy and Industry, Chung-Ang University, Seoul 06974, Republic of Korea.
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11
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Chen HS, Liu X, Zhang ZC, Ye ZH, Lin T, He DW, Wei GH. Computational fluid dynamics modeling approaches to assess lower urinary tract hydraulic dynamics in posterior urethral valve before and after endoscopic valve ablation: a pilot study. World J Urol 2021; 40:505-511. [PMID: 34811586 DOI: 10.1007/s00345-021-03875-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2021] [Accepted: 10/28/2021] [Indexed: 11/28/2022] Open
Abstract
PURPOSE Computational fluid dynamics (CFD) has been used successfully in cardiovascular system research to analyze the physiological processes inside vessels. We evaluated the hydraulic information of urine through the lower urinary tract in a patient with posterior urethral valve (PUV) before and after valve ablation by CFD. METHODS A set of models of the lower urinary tract were developed based on geometrical data obtained by cystoscopy and voiding cystourethrography. Simulated assumptions and conditions were applied according to prior studies and urodynamic results. We used Fluent CFD 19.0 (Ansys Inc., USA) to compute the velocity and pressure of the fluid regions. The simplification of Bernoulli's formula was applied afterward to calculate the hydraulic energy of different positions. RESULTS The urine flow rates of the NORMALst, the PUVst, and the POSTst at 5000 Pa were 18.08 ml/s, 11.14 ml/s, and 12.16 ml/s, respectively. Precipitous pressure change was observed around the valve in the PUVst, and the abnormal change was concentrated in the dilated urethra in the POSTst. Major energy dissipations were generated around the valve and the dilated urethra in the PUVst. The energy loss that occurred in the dilated urethra did not improve after the operation. CONCLUSIONS Our findings are probably indicative of the hydrodynamics changes in the dilated urethra in PUV and need to be confirmed through more improved CFD models in the future. CFD may revolutionize pediatric urologists' perception in the management of urinary disease.
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Affiliation(s)
- Hong-Song Chen
- Department of Urology, Children's Hospital of Chongqing Medical University, Chongqing, 400014, PR China.,Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing, 400014, PR China.,National Clinical Research Center for Child Health and Disorders, Chongqing, 400014, PR China.,China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Chongqing, 400014, PR China.,Children's Hospital of Chongqing Medical University, Chongqing, 400014, PR China.,Chongqing Key Laboratory of Pediatrics, Chongqing, 400014, PR China.,Chongqing Key Laboratory of Children Urogenital Development and Tissue Engineering, Chongqing, 400014, PR China
| | - Xing Liu
- Department of Urology, Children's Hospital of Chongqing Medical University, Chongqing, 400014, PR China. .,Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing, 400014, PR China. .,National Clinical Research Center for Child Health and Disorders, Chongqing, 400014, PR China. .,China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Chongqing, 400014, PR China. .,Children's Hospital of Chongqing Medical University, Chongqing, 400014, PR China. .,Chongqing Key Laboratory of Pediatrics, Chongqing, 400014, PR China. .,Chongqing Key Laboratory of Children Urogenital Development and Tissue Engineering, Chongqing, 400014, PR China.
| | - Zhi-Cheng Zhang
- Department of Urology, Children's Hospital of Chongqing Medical University, Chongqing, 400014, PR China.,Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing, 400014, PR China.,National Clinical Research Center for Child Health and Disorders, Chongqing, 400014, PR China.,China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Chongqing, 400014, PR China.,Children's Hospital of Chongqing Medical University, Chongqing, 400014, PR China.,Chongqing Key Laboratory of Pediatrics, Chongqing, 400014, PR China.,Chongqing Key Laboratory of Children Urogenital Development and Tissue Engineering, Chongqing, 400014, PR China
| | - Zi-Han Ye
- Department of Urology, Children's Hospital of Chongqing Medical University, Chongqing, 400014, PR China.,Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing, 400014, PR China.,National Clinical Research Center for Child Health and Disorders, Chongqing, 400014, PR China.,China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Chongqing, 400014, PR China.,Children's Hospital of Chongqing Medical University, Chongqing, 400014, PR China
| | - Tao Lin
- Department of Urology, Children's Hospital of Chongqing Medical University, Chongqing, 400014, PR China.,Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing, 400014, PR China.,National Clinical Research Center for Child Health and Disorders, Chongqing, 400014, PR China.,China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Chongqing, 400014, PR China.,Children's Hospital of Chongqing Medical University, Chongqing, 400014, PR China.,Chongqing Key Laboratory of Pediatrics, Chongqing, 400014, PR China.,Chongqing Key Laboratory of Children Urogenital Development and Tissue Engineering, Chongqing, 400014, PR China
| | - Da-Wei He
- Department of Urology, Children's Hospital of Chongqing Medical University, Chongqing, 400014, PR China.,Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing, 400014, PR China.,National Clinical Research Center for Child Health and Disorders, Chongqing, 400014, PR China.,China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Chongqing, 400014, PR China.,Children's Hospital of Chongqing Medical University, Chongqing, 400014, PR China.,Chongqing Key Laboratory of Pediatrics, Chongqing, 400014, PR China.,Chongqing Key Laboratory of Children Urogenital Development and Tissue Engineering, Chongqing, 400014, PR China
| | - Guang-Hui Wei
- Department of Urology, Children's Hospital of Chongqing Medical University, Chongqing, 400014, PR China.,Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing, 400014, PR China.,National Clinical Research Center for Child Health and Disorders, Chongqing, 400014, PR China.,China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Chongqing, 400014, PR China.,Children's Hospital of Chongqing Medical University, Chongqing, 400014, PR China.,Chongqing Key Laboratory of Pediatrics, Chongqing, 400014, PR China.,Chongqing Key Laboratory of Children Urogenital Development and Tissue Engineering, Chongqing, 400014, PR China
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12
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Domingues B, Pacheco M, Cruz JE, Carmagnola I, Teixeira‐Santos R, Laurenti M, Can F, Bohinc K, Moutinho F, Silva JM, Aroso IM, Lima E, Reis RL, Ciardelli G, Cauda V, Mergulhão FJ, Gálvez FS, Barros AA. Future Directions for Ureteral Stent Technology: From Bench to the Market. ADVANCED THERAPEUTICS 2021. [DOI: 10.1002/adtp.202100158] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Beatriz Domingues
- 3B's Research Group‐Research Institute on Biomaterials Biodegradables and Biomimetics University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine Avepark‐Parque Barco Guimarães 4805‐017 Portugal
- ICVS/3B's‐PT Government Associate Laboratory Braga/Guimarães 4805‐017 Portugal
| | - Margarida Pacheco
- 3B's Research Group‐Research Institute on Biomaterials Biodegradables and Biomimetics University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine Avepark‐Parque Barco Guimarães 4805‐017 Portugal
- ICVS/3B's‐PT Government Associate Laboratory Braga/Guimarães 4805‐017 Portugal
| | - Julia E. Cruz
- Endourology‐Endoscopy Department Minimally Invasive Surgery Centre Jesús Usón Cáceres 10071 Spain
| | - Irene Carmagnola
- Department of Mechanical and Aerospace Engineering Politecnico di Torino Turin 10129 Italy
- Polito BIOMedLAB Politecnico di Torino Turin 10129 Italy
| | - Rita Teixeira‐Santos
- LEPABE–Laboratory for Process Engineering Environment Biotechnology and Energy Faculty of Engineering University of Porto Porto 4200‐465 Portugal
| | - Marco Laurenti
- Department of Applied Science and Technology Politecnico di Torino Turin 10129 Italy
| | - Fusun Can
- Department of Medical Microbiology School of Medicine Koc University Istanbul 34450 Turkey
| | - Klemen Bohinc
- Faculty of Health Sciences University of Ljubljana Ljubljana 1000 Slovenia
| | - Fabíola Moutinho
- i3S‐Instituto de Investigação e Inovação em Saúde Universidade do Porto Porto 4200‐135 Portugal
- INEB‐Instituto de Engenharia Biomédica Universidade do Porto Porto 4200‐135 Portugal
| | - Joana M. Silva
- 3B's Research Group‐Research Institute on Biomaterials Biodegradables and Biomimetics University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine Avepark‐Parque Barco Guimarães 4805‐017 Portugal
- ICVS/3B's‐PT Government Associate Laboratory Braga/Guimarães 4805‐017 Portugal
| | - Ivo M. Aroso
- 3B's Research Group‐Research Institute on Biomaterials Biodegradables and Biomimetics University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine Avepark‐Parque Barco Guimarães 4805‐017 Portugal
- ICVS/3B's‐PT Government Associate Laboratory Braga/Guimarães 4805‐017 Portugal
| | - Estêvão Lima
- School of Health Sciences Life and Health Sciences Research Institute (ICVS) University of Minho Braga 4710‐057 Portugal
| | - Rui L. Reis
- 3B's Research Group‐Research Institute on Biomaterials Biodegradables and Biomimetics University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine Avepark‐Parque Barco Guimarães 4805‐017 Portugal
- ICVS/3B's‐PT Government Associate Laboratory Braga/Guimarães 4805‐017 Portugal
| | - Gianluca Ciardelli
- Department of Mechanical and Aerospace Engineering Politecnico di Torino Turin 10129 Italy
- Polito BIOMedLAB Politecnico di Torino Turin 10129 Italy
| | - Valentina Cauda
- Department of Applied Science and Technology Politecnico di Torino Turin 10129 Italy
| | - Filipe J. Mergulhão
- LEPABE–Laboratory for Process Engineering Environment Biotechnology and Energy Faculty of Engineering University of Porto Porto 4200‐465 Portugal
| | - Federico S. Gálvez
- Endourology‐Endoscopy Department Minimally Invasive Surgery Centre Jesús Usón Cáceres 10071 Spain
| | - Alexandre A. Barros
- 3B's Research Group‐Research Institute on Biomaterials Biodegradables and Biomimetics University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine Avepark‐Parque Barco Guimarães 4805‐017 Portugal
- ICVS/3B's‐PT Government Associate Laboratory Braga/Guimarães 4805‐017 Portugal
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13
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Zheng S, Carugo D, Mosayyebi A, Turney B, Burkhard F, Lange D, Obrist D, Waters S, Clavica F. Fluid mechanical modeling of the upper urinary tract. WIREs Mech Dis 2021; 13:e1523. [PMID: 34730288 DOI: 10.1002/wsbm.1523] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2020] [Revised: 02/01/2021] [Accepted: 02/02/2021] [Indexed: 12/20/2022]
Abstract
The upper urinary tract (UUT) consists of kidneys and ureters, and is an integral part of the human urogenital system. Yet malfunctioning and complications of the UUT can happen at all stages of life, attributed to reasons such as congenital anomalies, urinary tract infections, urolithiasis and urothelial cancers, all of which require urological interventions and significantly compromise patients' quality of life. Therefore, many models have been developed to address the relevant scientific and clinical challenges of the UUT. Of all approaches, fluid mechanical modeling serves a pivotal role and various methods have been employed to develop physiologically meaningful models. In this article, we provide an overview on the historical evolution of fluid mechanical models of UUT that utilize theoretical, computational, and experimental approaches. Descriptions of the physiological functionality of each component are also given and the mechanical characterizations associated with the UUT are provided. As such, it is our aim to offer a brief summary of the current knowledge of the subject, and provide a comprehensive introduction for engineers, scientists, and clinicians who are interested in the field of fluid mechanical modeling of UUT. This article is categorized under: Cancer > Biomedical Engineering Infectious Diseases > Biomedical Engineering Reproductive System Diseases > Biomedical Engineering.
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Affiliation(s)
- Shaokai Zheng
- ARTORG Center for Biomedical Engineering Research, University of Bern, Bern, Switzerland
| | - Dario Carugo
- Department of Pharmaceutics, UCL School of Pharmacy, University College London, London, UK
| | - Ali Mosayyebi
- Bioengineering Sciences, Faculty of Engineering and Physical Sciences, University of Southampton, Southampton, UK
| | - Ben Turney
- Nuffield Department of Surgical Sciences, University of Oxford, Oxford, UK
| | - Fiona Burkhard
- Department of Urology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Dirk Lange
- The Stone Centre at Vancouver General Hospital, Department of Urologic Sciences, University of British Columbia, Vancouver, British Columbia, Canada
| | - Dominik Obrist
- ARTORG Center for Biomedical Engineering Research, University of Bern, Bern, Switzerland
| | - Sarah Waters
- Oxford Centre for Industrial and Applied Mathematics, Mathematical Institute, University of Oxford, Oxford, UK
| | - Francesco Clavica
- ARTORG Center for Biomedical Engineering Research, University of Bern, Bern, Switzerland
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14
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Johnston L, Wang G, Hu K, Qian C, Liu G. Advances in Biosensors for Continuous Glucose Monitoring Towards Wearables. Front Bioeng Biotechnol 2021; 9:733810. [PMID: 34490230 PMCID: PMC8416677 DOI: 10.3389/fbioe.2021.733810] [Citation(s) in RCA: 42] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Accepted: 08/09/2021] [Indexed: 11/18/2022] Open
Abstract
Continuous glucose monitors (CGMs) for the non-invasive monitoring of diabetes are constantly being developed and improved. Although there are multiple biosensing platforms for monitoring glucose available on the market, there is still a strong need to enhance their precision, repeatability, wearability, and accessibility to end-users. Biosensing technologies are being increasingly explored that use different bodily fluids such as sweat and tear fluid, etc., that can be calibrated to and therefore used to measure blood glucose concentrations accurately. To improve the wearability of these devices, exploring different fluids as testing mediums is essential and opens the door to various implants and wearables that in turn have the potential to be less inhibiting to the wearer. Recent developments have surfaced in the form of contact lenses or mouthguards for instance. Challenges still present themselves in the form of sensitivity, especially at very high or low glucose concentrations, which is critical for a diabetic person to monitor. This review summarises advances in wearable glucose biosensors over the past 5 years, comparing the different types as well as the fluid they use to detect glucose, including the CGMs currently available on the market. Perspectives on the development of wearables for glucose biosensing are discussed.
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Affiliation(s)
- Lucy Johnston
- School of Engineering, The University of Glasgow, Glasgow, United Kingdom
| | - Gonglei Wang
- School of Life and Health Sciences, The Chinese University of Hong Kong, Shenzhen, China
| | - Kunhui Hu
- Shenzhen YHLO Biotech Co., Ltd., Shenzhen, China
| | - Chungen Qian
- The Key Laboratory for Biomedical Photonics of MOE at Wuhan National Laboratory for Optoelectronics, Hubei Bioinformatics and Molecular Imaging Key Laboratory, Systems Biology Theme, Department of Biomedical Engineering, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan, China
| | - Guozhen Liu
- School of Life and Health Sciences, The Chinese University of Hong Kong, Shenzhen, China
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15
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Comparative study of renal drainage with different ureteral stents subject to extrinsic ureteral obstruction using an in vitro ureter-stent model. BMC Urol 2021; 21:100. [PMID: 34261481 PMCID: PMC8281631 DOI: 10.1186/s12894-021-00865-w] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2021] [Accepted: 05/24/2021] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND To compare the efficacy of different ureteral stents subject to extrinsic ureteral obstruction (EUO), in a controlled in vitro stented ureter experiment. METHODS We employ an in vitro ureter-stent experimental set-up, with latex tubing simulating flexible ureters attached to vessels simulating renal units and bladders. The flow behavior of five ureteral stents-polymeric 8F, tandem 6F, tandem 7F, endopyelotomy and metal-was tested under a ureteral deformation configuration of 40°, with 2000 g external force over a 3.5 cm length of the ureter. A constant fluid flow was applied through the ureter-stent configurations, and pressure fluctuations in the renal unit were monitored. We considered a renal unit pressure of 10 cmH2O or flow discontinuation in the bladder as stent failure. Urine containing debris was mimicked by use of a colloidal solution. RESULTS Of all assessed ureteral stents, under EUO conditions, only the single 8F stents remained patent throughout the length of the experiment. All other stents-tandem 6F and 7F, single 7F, metal and endopyelotomy-displayed limitations. CONCLUSIONS Tandem and metal stents show no superiority over large luminal polymeric stents for EUO treatment in this in vitro model. Larger luminal stents offer excellent resistance to external pressure and allow adequate colloidal flow. The need for frequent exchange and bladder irritation should also be considered in the choice of stent configuration for treatment of kidney drainage under EUO.
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16
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Rodriguez-Villarreal AI, Tana LO, Cid J, Hernandez-Machado A, Alarcon T, Miribel-Catala P, Colomer-Farrarons J. An Integrated Detection Method for Flow Viscosity Measurements in Microdevices. IEEE Trans Biomed Eng 2021; 68:2049-2057. [PMID: 32746079 DOI: 10.1109/tbme.2020.3013519] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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17
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Vasantha Ramachandran R, Bhat R, Kumar Saini D, Ghosh A. Theragnostic nanomotors: Successes and upcoming challenges. WILEY INTERDISCIPLINARY REVIEWS-NANOMEDICINE AND NANOBIOTECHNOLOGY 2021; 13:e1736. [PMID: 34173342 DOI: 10.1002/wnan.1736] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Revised: 05/28/2021] [Accepted: 05/30/2021] [Indexed: 12/12/2022]
Abstract
The idea of "fantastic voyagers" carrying out medical tasks within the human body has existed as part of popular culture for many decades. The concept revolved around a miniaturized robot that can travel inside the human body and perform complicated functions such as surgery, navigation of otherwise inaccessible biological environments, and delivery of therapeutics. Since the last decade, significant developments have occurred in this arena that are yet to enter mainstream biomedical practises. Here, we define the challenges to make this fiction into reality. We begin by chalking the journey from pills, nanoparticles, and then to micro-nanomotors. The review describes the principles, physicochemical contexts, and advantages that micro-nanomotors provide. The article then describes micro-nanomotors' obstacles such as maneuverability, in vivo imaging, toxicity, and biodistribution. This article is categorized under: Diagnostic Tools > In Vivo Nanodiagnostics and Imaging Nanotechnology Approaches to Biology > Nanoscale Systems in Biology.
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Affiliation(s)
| | - Ramray Bhat
- Department of Molecular Reproduction, Development and Genetics, Indian Institute of Science, Bangalore, India
| | - Deepak Kumar Saini
- Centre for Biosystems Science and Engineering, Indian Institute of Science, Bangalore, India.,Department of Molecular Reproduction, Development and Genetics, Indian Institute of Science, Bangalore, India
| | - Ambarish Ghosh
- Centre for Nano Science and Engineering, Indian Institute of Science, Bangalore, India.,Department of Physics, Indian Institute of Science, Bangalore, India
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18
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High-Throughput Cell Concentration Using A Piezoelectric Pump in Closed-Loop Viscoelastic Microfluidics. MICROMACHINES 2021; 12:mi12060677. [PMID: 34207912 PMCID: PMC8229193 DOI: 10.3390/mi12060677] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/23/2021] [Revised: 06/01/2021] [Accepted: 06/07/2021] [Indexed: 11/29/2022]
Abstract
Cell concentration is a critical process in biological assays and clinical diagnostics for the pre-treatment of extremely rare disease-related cells. The conventional technique for sample preconcentration and centrifugation has the limitations of a batch process requiring expensive and large equipment. Therefore, a high-throughput continuous cell concentration technique needs to be developed. However, in single-pass operation, the required concentration ratio is hard to achieve. In this study, we propose a closed-loop continuous cell concentration system using a viscoelastic non-Newtonian fluid. For miniaturized and integrated systems, two piezoelectric pumps were adopted. The pumping capability generated by a piezoelectric pump in a microfluidic channel was evaluated depending on the applied voltage, frequency, sample viscosity, and channel length. The concentration performance of the device was evaluated using 13 μm particles and white blood cells (WBCs) with different channel lengths and voltages. In the closed-loop system, the focused cells collected at the center outlet were sent back to the inlet, while the buffer solution was removed to the side outlets. Finally, to expand the clinical applicability of our closed-loop system, WBCs in lysed blood samples with 70% hematocrit and prostate cancer cells in urine samples were used. Using the closed-loop system, WBCs were concentrated by ~63.4 ± 0.8-fold within 20 min to a final volume of 160 μL using 10 mL of lysed blood sample with 70% hematocrit (~3 cP). In addition, prostate cancer cells in 10 mL urine samples were concentrated by ~64.1-fold within ~11 min due to low viscosity (~1 cP).
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19
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Modha S, Shen Y, Chamouni H, Mulchandani A, Tsutsui H. Laser-etched grooves for rapid fluid delivery for a paper-based chemiresistive biosensor. Biosens Bioelectron 2021; 180:113090. [PMID: 33662845 DOI: 10.1016/j.bios.2021.113090] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2020] [Accepted: 02/10/2021] [Indexed: 11/25/2022]
Abstract
Paper-based microfluidic devices are an attractive option for developing low-cost, point-of-care diagnostic tools. To incorporate more complex assays into paper, these devices must become more sophisticated, through the sequential delivery of different liquids or reagents without user intervention. Many flow control strategies focus on slowing the fluid down. However, this can lead to increased assay times and sample loss due to evaporation. We report the use of a CO2 laser to create etched grooves on paper to accelerate wicking speeds in paper-based microfluidic devices. We explored different laser settings to determine the optimal configuration. Our findings showed that simply cutting a slit into the paper created the fastest wicking channels. The slit acted as a macro capillary, allowing fluid to bypass the paper and speed it up. Further studies determined an ideal groove pitch of 0.75 mm (spacing in between grooves) for a paper channel. Additional experiments documented how sealing grooved channels with different adhesives can influence wicking. Overall, sealing the channels with tape made them wick faster. However, sealing methods such as lamination had a negative effect on wicking. Laser-etched grooves were successfully used to design a fluid-handling architecture for a chemiresistive paper-based biosensor. The grooves facilitated rapid, sequential delivery of sample and wash buffer. Human serum albumin spiked in phosphate buffer, artificial urine, and artificial saliva was successfully detected at as low as 15 pM. Etching grooves in paper is a simple process that requires no additional materials or chemicals, allowing single-step fabrication of paper-based microfluidic channels.
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Affiliation(s)
- Sidharth Modha
- Department of Bioengineering, University of California, Riverside, Riverside, CA, 92521, USA
| | - Yu Shen
- Department of Chemical and Environmental Engineering, University of California, Riverside, Riverside, CA, 92521, USA
| | - Hussein Chamouni
- Department of Mechanical Engineering, University of California, Riverside, Riverside, CA, 92521, USA
| | - Ashok Mulchandani
- Department of Chemical and Environmental Engineering, University of California, Riverside, Riverside, CA, 92521, USA; Center for Environmental Research and Technology (CE-CERT), University of California, Riverside, Riverside, CA, 92507, USA
| | - Hideaki Tsutsui
- Department of Bioengineering, University of California, Riverside, Riverside, CA, 92521, USA; Department of Mechanical Engineering, University of California, Riverside, Riverside, CA, 92521, USA; Stem Cell Center, University of California, Riverside, Riverside, CA, 92521, USA.
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20
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Erdbrügger U, Blijdorp CJ, Bijnsdorp IV, Borràs FE, Burger D, Bussolati B, Byrd JB, Clayton A, Dear JW, Falcón‐Pérez JM, Grange C, Hill AF, Holthöfer H, Hoorn EJ, Jenster G, Jimenez CR, Junker K, Klein J, Knepper MA, Koritzinsky EH, Luther JM, Lenassi M, Leivo J, Mertens I, Musante L, Oeyen E, Puhka M, van Royen ME, Sánchez C, Soekmadji C, Thongboonkerd V, van Steijn V, Verhaegh G, Webber JP, Witwer K, Yuen PS, Zheng L, Llorente A, Martens‐Uzunova ES. Urinary extracellular vesicles: A position paper by the Urine Task Force of the International Society for Extracellular Vesicles. J Extracell Vesicles 2021; 10:e12093. [PMID: 34035881 PMCID: PMC8138533 DOI: 10.1002/jev2.12093] [Citation(s) in RCA: 157] [Impact Index Per Article: 52.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Revised: 03/26/2021] [Accepted: 04/22/2021] [Indexed: 12/17/2022] Open
Abstract
Urine is commonly used for clinical diagnosis and biomedical research. The discovery of extracellular vesicles (EV) in urine opened a new fast-growing scientific field. In the last decade urinary extracellular vesicles (uEVs) were shown to mirror molecular processes as well as physiological and pathological conditions in kidney, urothelial and prostate tissue. Therefore, several methods to isolate and characterize uEVs have been developed. However, methodological aspects of EV separation and analysis, including normalization of results, need further optimization and standardization to foster scientific advances in uEV research and a subsequent successful translation into clinical practice. This position paper is written by the Urine Task Force of the Rigor and Standardization Subcommittee of ISEV consisting of nephrologists, urologists, cardiologists and biologists with active experience in uEV research. Our aim is to present the state of the art and identify challenges and gaps in current uEV-based analyses for clinical applications. Finally, recommendations for improved rigor, reproducibility and interoperability in uEV research are provided in order to facilitate advances in the field.
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21
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Puneeth SB, Goel S. Handheld and ‘Turnkey’ 3D printed paper-microfluidic viscometer with on-board microcontroller for smartphone based biosensing applications. Anal Chim Acta 2021; 1153:338303. [PMID: 33714437 DOI: 10.1016/j.aca.2021.338303] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Revised: 02/02/2021] [Accepted: 02/04/2021] [Indexed: 11/29/2022]
Affiliation(s)
- S B Puneeth
- MEMS, Microfluidics and Nanoelectronics Lab, Department of Electronics and Electrical Science, Birla Institute of Technology and Science, Pilani, Hyderabad Campus, Hyderabad, India, 500078
| | - Sanket Goel
- MEMS, Microfluidics and Nanoelectronics Lab, Department of Electronics and Electrical Science, Birla Institute of Technology and Science, Pilani, Hyderabad Campus, Hyderabad, India, 500078.
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22
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Fontanella CG, Carniel EL. Computational Tools for the Investigation of the Male Lower Urinary Tract Functionality in Health and Disease. J Med Biol Eng 2021. [DOI: 10.1007/s40846-021-00599-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Abstract
Purpose
This paper aims to show the potentialities of computational bioengineering in the field of lower urinary tract pathophysiology. Engineering methods allow the investigation of urine flow in healthy and pathologic conditions and the analysis of urethral occlusion by means of artificial urinary sphincters.
Methods
Computational models of bladder and urethra were developed and exploited to investigate the lower urinary tract physiology in health and in disease. Average male morphometric configurations were assumed, together with typical properties of both biological tissues and fluids. The reliability of the models was assessed by the mutual comparison of results and the investigation of data from experimental and clinical activities.
Results
The developed models allowed to analyze typical situations, such as the micturition in health and in disease, and the lumen occlusion by external devices. The models provided information that clinical and experimental tests barely provide, as the occurrence of turbulent phenomena within urine flow, the shear stresses at the lumen wall, the external pressure that is strictly required to occlude the lumen.
Conclusions
The methods of bioengineering allow broadening and deepening the knowledge of the lower urinary tract functionality. More in detail, modeling techniques provide information that contributes to explain the occurrence of pathological situations, and allows to design and to optimize clinical-surgical procedures and devices.
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23
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Zhang B, Liu S, Liu Y, Wu B, Zhang X, Wang X, Liang X, Cao X, Wang D, Wu CL. Novel CFD modeling approaches to assessing urine flow in prostatic urethra after transurethral surgery. Sci Rep 2021; 11:663. [PMID: 33436678 PMCID: PMC7804846 DOI: 10.1038/s41598-020-79505-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Accepted: 11/30/2020] [Indexed: 11/09/2022] Open
Abstract
Assessment of the pressure and velocity of urine flow for different diameter ratios of prostatic urethra (RPU) after transurethral surgery using computational fluid dynamics (CFD). A standardized and idealized two-dimensional CFD model after transurethral surgery (CATS-1st) was developed for post-surgery mid-voiding. Using CATS-1st, 210 examples were amplified according to an array of size [3][5][14], which contained three groups of longitudinal diameters of prostatic urethra (LD-PU). Each of these groups contained five subgroups of transverse diameters of the bladder neck (TD-BN), each with 14 examples of transverse diameters of PU (TD-PU). The pressure and velocity of urine flow were monitored through flow dynamics simulation, and the relationship among RPU-1 (TD-PU/TD-BN), RPU-2 (RPU-1/LD-PU), the transverse diameter of the vortex, and the midpoint velocity of the external urethral orifice (MV-EUO) was determined. A total of 210 CATS examples, including CATS-1st examples, were analyzed. High (bladder and PU) and medium/low (the rest of the urethra) pressure zones, and low (bladder), medium (PU), and high (the rest of the urethra) velocity zones were determined. The rapid changes in the velocity were concentrated in and around the PU. Laminar flow was present in all the examples. The vortices appeared and then gradually shrank with reducing RPU on both the sides of PU in 182 examples. In the vortex examples, minimum RPU-1 and RPU-2 reached close to the values of 0.79 and 0.02, respectively. MV-EUO increased gradually with decreasing RPU. In comparison to the vortex examples, the non-vortex examples exhibited a significantly higher (p < 0.01) MV-EUO. The developed CFD models (CATS) presented an effective simulation of urine flow behavior within the PU after transurethral surgery for benign prostatic hyperplasia (BPH). These models could prove to be useful for morphological repair in PU after transurethral surgery.
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Affiliation(s)
- Bin Zhang
- Department of Urology, First Hospital of Shanxi Medical University, Taiyuan, 030001, Shanxi, China.,Department of Urology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, 02114, USA
| | - Shuang Liu
- Department of Urology, First Hospital of Shanxi Medical University, Taiyuan, 030001, Shanxi, China
| | - Yinxia Liu
- Department of Obstetrics and Gynecology, Shanxi Health Vocational College, Shanxi Traditional Chinese Medicine School, Jinzhong, 030600, Shanxi, China
| | - Bo Wu
- Department of Urology, First Hospital of Shanxi Medical University, Taiyuan, 030001, Shanxi, China
| | - Xuhui Zhang
- Department of Urology, First Hospital of Shanxi Medical University, Taiyuan, 030001, Shanxi, China
| | - Xin Wang
- Department of Urology, First Hospital of Shanxi Medical University, Taiyuan, 030001, Shanxi, China
| | - Xuezhi Liang
- Department of Urology, First Hospital of Shanxi Medical University, Taiyuan, 030001, Shanxi, China
| | - Xiaoming Cao
- Department of Urology, First Hospital of Shanxi Medical University, Taiyuan, 030001, Shanxi, China
| | - Dongwen Wang
- National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital & Shenzhen Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, No. 113 Baohe road, Longgang district, Shenzhen, 518116, China. .,First College of Clinical Medicine, Shanxi Medical University, Taiyuan, 030001, Shanxi, China.
| | - Chin-Lee Wu
- Department of Urology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, 02114, USA.,Department of Pathology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, 02114, USA
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24
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Kao YT, Kaminski TS, Postek W, Guzowski J, Makuch K, Ruszczak A, von Stetten F, Zengerle R, Garstecki P. Gravity-driven microfluidic assay for digital enumeration of bacteria and for antibiotic susceptibility testing. LAB ON A CHIP 2020; 20:54-63. [PMID: 31774415 DOI: 10.1039/c9lc00684b] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The alarming dynamics of antibiotic-resistant infections calls for the development of rapid and point-of-care (POC) antibiotic susceptibility testing (AST) methods. Here, we demonstrated the first completely stand-alone microfluidic system that allowed the execution of digital enumeration of bacteria and digital antibiograms without any specialized microfluidic instrumentation. A four-chamber gravity-driven step emulsification device generated ∼2000 monodisperse 2 nanoliter droplets with a coefficient of variation of 8.9% of volumes for 95% of droplets within less than 10 minutes. The manual workload required for droplet generation was limited to the sample preparation, the deposition into the sample inlet of the chip and subsequent orientation of the chip vertically without an additional pumping system. The use of shallow chambers imposing a 2D droplet arrangement provided superior stability of the droplets against coalescence and minimized the leakage of the reporter viability dye between adjacent droplets during long-term culture. By using resazurin as an indicator of the growth of bacteria, we were also able to reduce the assay time to ∼5 hours compared to 20 hours using the standard culture-based test.
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Affiliation(s)
- Yu-Ting Kao
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland. and Laboratory for MEMS Applications, IMTEK-Department of Microsystems Engineering, University of Freiburg, Georges-Koehler-Allee 103, 79110 Freiburg, Germany
| | - Tomasz S Kaminski
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland.
| | - Witold Postek
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland.
| | - Jan Guzowski
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland.
| | - Karol Makuch
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland.
| | - Artur Ruszczak
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland.
| | - Felix von Stetten
- Laboratory for MEMS Applications, IMTEK-Department of Microsystems Engineering, University of Freiburg, Georges-Koehler-Allee 103, 79110 Freiburg, Germany and Hahn-Schickard, Georges-Koehler-Allee 103, 79110, Freiburg, Germany
| | - Roland Zengerle
- Laboratory for MEMS Applications, IMTEK-Department of Microsystems Engineering, University of Freiburg, Georges-Koehler-Allee 103, 79110 Freiburg, Germany and Hahn-Schickard, Georges-Koehler-Allee 103, 79110, Freiburg, Germany
| | - Piotr Garstecki
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland.
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25
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Shilo Y, Modai J, Leibovici D, Dror I, Berkowitz B. The Impact of Ureteral Deformation and External Ureteral Pressure on Stent Failure in Extrinsic Ureteral Obstruction: An In Vitro Experimental Study. J Endourol 2019; 34:68-73. [PMID: 31359787 DOI: 10.1089/end.2019.0465] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Background and Purpose: Extrinsic ureteral obstruction is caused frequently by pelvic malignancies or metastatic lymphadenopathy, necessitating renal drainage with ureteral stents to prevent renal failure and kidney damage. Understanding the nature of stent behavior under deformation and realistic external pressures may assist in evaluation of stent performance. Few published studies have investigated the flow and mechanical properties of stents within ureters, and none has considered the effects of deformation and compression on flow in realistic, in vitro, ureter-stent systems. The purpose of this work was to determine whether or not stent failure is due only to stent compression and deformation in the presence of extrinsic obstruction. Methods: We developed an in vitro ureter-stent experimental setup, using latex tubing to simulate a flexible ureter connecting a renal unit and a bladder side. We examined flow behavior in three stents (4.8F, 6F, 7F). The ureter-stent configuration was varied, simulating four levels of deformation (0°, 20°, 40°, 60°) and then simulating different external compressive forces on a stented ureter with 40° deformation. A constant, realistic fluid flow was applied through the ureter-stent configurations, and pressure fluctuations in the renal unit were monitored. Results: Deformation alone on four different levels (0°, 20°, 40°, 60°) has essentially no influence on fluid flow and renal pressure variation. Under increasing external compressive forces of 500, 1000, 2000, and up to 5000 g at 40° deformation, no effect on fluid flow and pressure within the renal unit was noted for the 6F and 7F stents. The only exception was for the 4.8F stent, which demonstrated complete failure at compressive forces near 4000 g. Conclusions: Neither realistic extrinsic ureteral compression forces nor ureteral deformation explain the high frequency of stent failure in extrinsic ureteral obstruction. Other factors such as urine composition may be a major contributor to stent failure.
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Affiliation(s)
- Yaniv Shilo
- Department of Urology, Kaplan Medical Center, Rehovot, Israel
| | - Jonathan Modai
- Department of Urology, Kaplan Medical Center, Rehovot, Israel
| | - Dan Leibovici
- Department of Urology, Kaplan Medical Center, Rehovot, Israel
| | - Ishai Dror
- Department of Earth and Planetary Sciences, Weizmann Institute of Science, Rehovot, Israel
| | - Brian Berkowitz
- Department of Earth and Planetary Sciences, Weizmann Institute of Science, Rehovot, Israel
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26
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Velasco-Bejarano B, Mercado K, Camacho E, Rodríguez L, Gómez-Pliego R, Méndez EA. Development of in-house materials for the verification of specific gravity measurements: Homogeneity, stability, and proficiency studies. Drug Test Anal 2019; 11:1302-1307. [PMID: 31243893 DOI: 10.1002/dta.2670] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2018] [Revised: 04/16/2019] [Accepted: 06/10/2019] [Indexed: 11/06/2022]
Abstract
We developed and evaluated the properties of in-house urine reference materials for the verification of laboratory refractometers, which are frequently used in clinical chemistry and doping testing laboratories. Urine was gathered from 26 healthy volunteers (16 male 30 ± 5 years old and 10 female 29 ± 4 years old), from which two urine batches were obtained: one with a low specific gravity (1.012± 0.003) and the other with a high specific gravity (1.027 ± 0.003). Homogeneity studies were conducted over 20 consecutive days. For short-term stability studies, aliquots of both urine batches were stored at -20 ± 2°C; 3 ± 2°C; 20 ± 2°C; 45 ± 2°C for 0, 2, 7, 14 and 35 days, under both light and dark conditions. Similarly, another study was conducted to measure the long-term stability of urine at -20 ± 2°C, over a 24-month evaluation period. Our data showed that the urine was homogeneous and stable at -20 ± 2°C, 3 ± 2°C, 20 ± 2°C, and 45 ± 2°C under both light and dark conditions. In all cases, the urine was evaluated by specific gravity and no statistically significant differences (p ≤ 0.05) were recorded. Additionally, a proficiency test was conducted in collaboration with 15 ISO/IEC 17025 accredited laboratories, and z-scores and performance factors were evaluated. These data indicate that this material could be used for the verification of refractometers.
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Affiliation(s)
- Benjamín Velasco-Bejarano
- Laboratorio Nacional de Prevención y Control del Dopaje-CONADE, Ciudad de México, C.P. 14060, Mexico.,Departamento de Ciencias Químicas, Sección de Química Orgánica, Facultad de Estudios Superiores Cuautitlán-UNAM, Cuautitlán Izcalli, Estado de México, C.P. 54740, Mexico
| | - Karina Mercado
- Laboratorio Nacional de Prevención y Control del Dopaje-CONADE, Ciudad de México, C.P. 14060, Mexico
| | - Evangelina Camacho
- Laboratorio Nacional de Prevención y Control del Dopaje-CONADE, Ciudad de México, C.P. 14060, Mexico
| | - Leonardo Rodríguez
- Laboratorio Nacional de Prevención y Control del Dopaje-CONADE, Ciudad de México, C.P. 14060, Mexico
| | - Raquel Gómez-Pliego
- Departamento de Ciencias Biológicas, Sección de Ciencias de la Salud Humana, Facultad de Estudios Superiores Cuautitlán-UNAM, Cuautitlán Izcalli, Estado de México, C.P. 54740, Mexico
| | - Eradio A Méndez
- Laboratorio Nacional de Prevención y Control del Dopaje-CONADE, Ciudad de México, C.P. 14060, Mexico
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27
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Ferrell N, Sandoval RM, Molitoris BA, Brakeman P, Roy S, Fissell WH. Application of physiological shear stress to renal tubular epithelial cells. Methods Cell Biol 2019; 153:43-67. [PMID: 31395384 DOI: 10.1016/bs.mcb.2019.04.010] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Renal tubular epithelial cells are consistently exposed to flow of glomerular filtrate that creates fluid shear stress at the apical cell surface. This biophysical stimulus regulates several critical renal epithelial cell functions, including transport, protein uptake, and barrier function. Defining the in vivo mechanical conditions in the kidney tubule is important for accurately recapitulating these conditions in vitro. Here we provide a summary of the fluid flow conditions in the kidney and how this translates into different levels of fluid shear stress down the length of the nephron. A detailed method is provided for measuring fluid flow in the proximal tubule by intravital microscopy. Devices to mimic in vivo fluid shear stress for in vitro studies are discussed, and we present two methods for culture and analysis of renal tubule epithelial cells exposed physiological levels of fluid shear stress. The first is a microfluidic device that permits application of controlled shear stress to cells cultured on porous membranes. The second is culture of renal tubule cells on an orbital shaker. Each method has advantages and disadvantages that should be considered in the context of the specific experimental objectives.
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Affiliation(s)
- Nicholas Ferrell
- Department of Medicine, Division of Nephrology, Vanderbilt University Medical Center, Nashville, TN, United States; Department of Biomedical Engineering, Vanderbilt University, Nashville, TN, United States.
| | - Ruben M Sandoval
- Department of Medicine, Indiana University School of Medicine, Indianapolis, IN, United States
| | - Bruce A Molitoris
- Department of Medicine, Indiana University School of Medicine, Indianapolis, IN, United States
| | - Paul Brakeman
- Department of Pediatrics, University of California, San Francisco, CA, United States
| | - Shuvo Roy
- Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, CA, United States
| | - William H Fissell
- Department of Medicine, Division of Nephrology, Vanderbilt University Medical Center, Nashville, TN, United States
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28
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Kang H, Jang I, Song S, Bae SC. Development of a Paper-Based Viscometer for Blood Plasma Using Colorimetric Analysis. Anal Chem 2019; 91:4868-4875. [DOI: 10.1021/acs.analchem.9b00624] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Hyunwoong Kang
- Department of Mechanical Engineering, Hanyang University, Seoul 04763, Korea
| | - Ilhoon Jang
- Institute of Nano Science and Technology, Hanyang University, Seoul 04763, Korea
| | - Simon Song
- Department of Mechanical Engineering, Hanyang University, Seoul 04763, Korea
- Institute of Nano Science and Technology, Hanyang University, Seoul 04763, Korea
| | - Sang-Cheol Bae
- Department of Rheumatology, Hanyang University Hospital for Rheumatic Diseases, Seoul 04763, Korea
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29
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Herranz B, Álvarez MD, Pérez-Jiménez J. Association of plasma and urine viscosity with cardiometabolic risk factors and oxidative status. A pilot study in subjects with abdominal obesity. PLoS One 2018; 13:e0204075. [PMID: 30300348 PMCID: PMC6177142 DOI: 10.1371/journal.pone.0204075] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2018] [Accepted: 08/31/2018] [Indexed: 11/18/2022] Open
Abstract
There is increasing interest in the search for accurate, repeatable and widely applicable clinical biomarkers for the early detection of cardiometabolic alterations and oxidative status. Viscosity is a promising tool in that sense, although most studies have used simple viscosimeters, providing limited information, and have not considered oxidative status. The aim of this study was to assess whether viscosity determinations were associated with cardiometabolic and oxidative status in subjects at a primary stage of cardiometabolic risk. A pilot study (n = 20) was conducted in subjects with abdominal obesity, determining urine and plasma viscosity with a rotational rheometer at different shear rates (10000-1000 s-1 in plasma and 1000-50 s-1 in urine). Simple regression showed that urine viscosity was significantly (p< 0.05) associated with markers of oxidative status, and plasma viscosity with blood glucose. Categorical Principal Component Analysis plots showed that urine viscosity measurements at different shear rates clustered in three groups (low, intermediate and high shear rates) were selectively associated with uric acid, polyphenols and antioxidant capacity respectively. Plasma viscosity did not seem to be a relevant clinical marker in subjects with abdominal obesity. Therefore, urine viscosity could potentially serve as a complimentary marker in the evaluation of oxidative status.
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Affiliation(s)
- Beatriz Herranz
- Dpt. Characterization, Quality and Safety, Institute of Food Science, Technology and Nutrition (ICTAN-CSIC), Madrid, Spain
| | - María Dolores Álvarez
- Dpt. Characterization, Quality and Safety, Institute of Food Science, Technology and Nutrition (ICTAN-CSIC), Madrid, Spain
| | - Jara Pérez-Jiménez
- Dpt. Metabolism and Nutrition, Institute of Food Science, Technology and Nutrition (ICTAN-CSIC), Madrid, Spain
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30
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Razavi SE, Jouybar M. Fluid-structure interaction simulation of ureter with vesicoureteral reflux and primary obstructed megaureter. Biomed Mater Eng 2018; 29:821-837. [PMID: 30282337 DOI: 10.3233/bme-181026] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Two common abnormalities in ureters include primary refluxing megaureter (PRM) and primary obstructed megaureter (POM). The aim of this study was to represent the numerical simulation of the urine flow at the end of the ureter with vesicoureteral reflux (VUR) and POM during peristalsis. Methodologically, the peristalsis in the ureter wall was created using Gaussian distribution. Fluid-structure interaction (FSI) was applied to simulate urine-elastic wall interactions; and governing equations were solved using the arbitrary Lagrangian-Eulerian method. Theories such as wall elasticity, Newtonian fluid, and incompressible Navier-Stokes equations were used. Velocity fields, viscous stresses and volumetric outflow rate profiles were obtained through the simulation of the ureter with VUR and POM during peristalsis. In addition, the effect of urine viscosity on flow rate was investigated. When the bladder pressure increased, VUR occurred because of the ureterovesical junction (UVJ) dysfunction, leading to high stresses on the wall. In the POM, the outflow rate was ultimately zero, and stresses on the wall were severe in the obstructed section. Comparing the results demonstrated that the peristalsis leads to even further dilation of the prestenosis portion. It was also observed that the reflux occurs in the ureter with VUR when the bladder pressure is high. Additionally, the urine velocity during the peristalsis was higher than the non-peristaltic ureter.
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Affiliation(s)
| | - Mohammad Jouybar
- School of Industrial and Information Engineering, Polytechnic University of Milan, Milan, Italy
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31
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Tzeng BB, Sun YS. Design and Fabrication of a Microfluidic Viscometer Based on Electrofluidic Circuits. MICROMACHINES 2018; 9:mi9080375. [PMID: 30424308 PMCID: PMC6187613 DOI: 10.3390/mi9080375] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/04/2018] [Revised: 07/18/2018] [Accepted: 07/26/2018] [Indexed: 12/28/2022]
Abstract
This paper reports a microfluidic viscometer based on electrofluidic circuits for measuring viscosities of liquid samples. The developed micro-device consists of a polydimethylsiloxane (PDMS) layer for electrofluidic circuits, a thin PDMS membrane, another PDMS layer for sample pretreatment, and a glass substrate. As the sample flows inside the microfluidic channel, its viscosity causes flow resistance and a pressure drop along this channel. This pressure drop, in turn, generates a hydraulic pressure which deforms the PDMS membrane, causing changes in the cross-sectional area and the electrical resistance of the electrofluidic resistor. This small resistance change is then measured via the electrofluidic Wheatstone bridge to relate the measured voltage difference to the fluidic viscosity. The performance of this viscometer was first tested by flowing nitrogen gas with controllable pressures into the device. The relationship between measured voltage difference and input gas pressure was analyzed to be linear in the pressure range of 0–15 psi. Another test using pure water indicated good linearity between measured voltage difference and flow rate in the rate range of 20–100 μL/min. Viscosities of glycerol/water solutions with volume/volume (v/v) concentrations ranging from 0 to 30% were measured, and these values were close to those obtained using commercially available viscometers. In addition, the sample-pretreatment layer can be used to mix and/or dilute liquid samples to desired concentrations. Therefore, this microfluidic device has potential for measurements of fluidic viscosity in a fast, accurate, and high-throughput manner.
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Affiliation(s)
- Bo-Bi Tzeng
- Department of Physics, Fu-Jen Catholic University, New Taipei City 24205, Taiwan.
| | - Yung-Shin Sun
- Department of Physics, Fu-Jen Catholic University, New Taipei City 24205, Taiwan.
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32
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33
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Chen A, Fu G, Xu Z, Sun Y, Chen X, Cheng KS, Neoh KH, Tang Z, Chen S, Liu M, Huang T, Dai Y, Wang Q, Jin J, Jin B, Han RPS. Detection of Urothelial Bladder Carcinoma via Microfluidic Immunoassay and Single-Cell DNA Copy-Number Alteration Analysis of Captured Urinary-Exfoliated Tumor Cells. Cancer Res 2018; 78:4073-4085. [PMID: 29789419 DOI: 10.1158/0008-5472.can-17-2615] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2017] [Revised: 01/17/2018] [Accepted: 05/15/2018] [Indexed: 11/16/2022]
Affiliation(s)
- Anqi Chen
- MSE Department, College of Engineering, Peking University, Beijing, China
| | - Guanghou Fu
- Department of Urology, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Zhijie Xu
- Department of Urology, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Yukun Sun
- MSE Department, College of Engineering, Peking University, Beijing, China
| | - Xiaoyi Chen
- Department of Urology, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Kok Suen Cheng
- MSE Department, College of Engineering, Peking University, Beijing, China
| | - Kuang Hong Neoh
- MSE Department, College of Engineering, Peking University, Beijing, China
| | - Zhewen Tang
- MSE Department, College of Engineering, Peking University, Beijing, China
| | | | - Ming Liu
- HaploX Biotechnology, Shenzhen, China
| | | | - Yun Dai
- Department of Urology, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Qibo Wang
- Department of Urology, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Jing Jin
- Department of Urology, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Baiye Jin
- Department of Urology, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China.
| | - Ray P S Han
- MSE Department, College of Engineering, Peking University, Beijing, China.
- Jiangxi University of Traditional Chinese Medicine, Nanchang, Jiangxi, China
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34
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Guo W, Hansson J, van der Wijngaart W. Capillary pumping independent of the liquid surface energy and viscosity. MICROSYSTEMS & NANOENGINEERING 2018; 4:2. [PMID: 31057892 PMCID: PMC6220164 DOI: 10.1038/s41378-018-0002-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2017] [Revised: 12/08/2017] [Accepted: 12/14/2017] [Indexed: 05/24/2023]
Abstract
Capillary pumping is an attractive means of liquid actuation because it is a passive mechanism, i.e., it does not rely on an external energy supply during operation. The capillary flow rate generally depends on the liquid sample viscosity and surface energy. This poses a problem for capillary-driven systems that rely on a predictable flow rate and for which the sample viscosity or surface energy are not precisely known. Here, we introduce the capillary pumping of sample liquids with a flow rate that is constant in time and independent of the sample viscosity and sample surface energy. These features are enabled by a design in which a well-characterized pump liquid is capillarily imbibed into the downstream section of the pump and thereby pulls the unknown sample liquid into the upstream pump section. The downstream pump geometry is designed to exert a Laplace pressure and fluidic resistance that are substantially larger than those exerted by the upstream pump geometry on the sample liquid. Hence, the influence of the unknown sample liquid on the flow rate is negligible. We experimentally tested pumps of the new design with a variety of sample liquids, including water, different samples of whole blood, different samples of urine, isopropanol, mineral oil, and glycerol. The capillary filling speeds of these liquids vary by more than a factor 1000 when imbibed to a standard constant cross-section glass capillary. In our new pump design, 20 filling tests involving these liquid samples with vastly different properties resulted in a constant volumetric flow rate in the range of 20.96-24.76 μL/min. We expect this novel capillary design to have immediate applications in lab-on-a-chip systems and diagnostic devices.
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Affiliation(s)
- Weijin Guo
- Micro and Nanosystems, KTH Royal Institute of Technology, Osquldas väg 10, Stockholm, 100 44 Sweden
| | - Jonas Hansson
- Micro and Nanosystems, KTH Royal Institute of Technology, Osquldas väg 10, Stockholm, 100 44 Sweden
| | - Wouter van der Wijngaart
- Micro and Nanosystems, KTH Royal Institute of Technology, Osquldas väg 10, Stockholm, 100 44 Sweden
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35
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Grases F, Söhnel O. Can Randall's plug composed of calcium oxalate form via the free particle mechanism? BMC Urol 2017; 17:80. [PMID: 28886706 PMCID: PMC5591557 DOI: 10.1186/s12894-017-0274-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Accepted: 09/04/2017] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The likelihood of a Randall's plug composed of calcium oxalate monohydrate (COM) forming by the free particle mechanism in a model of kidney with a structure recently described by Robertson was examined at the most favourable conditions for the considered mechanism. METHODS The Robertson model of the kidney is used in the following development. The classical theory of crystallization was used for calculations. RESULTS Initial COM nuclei were assumed to form at the beginning of the ascending loop of Henle where the supersaturation with respect to COM has been shown to reach the threshold level for spontaneous nucleation. Nucleation proceeds by a heterogeneous mechanism. The formed particles are transported in the nephron by a laminar flow of liquid with a parabolic velocity profile. Particles travel with a velocity dependent on their position in the cross-section of the nephron assumed to be straight tubule with smooth walls and without any sharp bends and kinks. These particles move faster with time as they grow as a result of being surrounded by the supersaturated liquid. Individual COM particles (crystals) can reach maximum diameter of 5.2 × 10-6 m, i.e. 5.2 μm, at the opening of the CD and would thus always be washed out of the CD into the calyx regardless of the orientation of the CD. Agglomeration of COM crystals forms a fractal object with an apparent density lower than the density of solid COM. The agglomerate that can block the beginning of the CD is composed of more crystals than are available even during crystaluria. Moreover the settling velocity of agglomerate blocking the opening of the CD is lower than the liquid flow and thus such agglomerate would be washed out even from upward-draining CD. CONCLUSIONS The free particle mechanism may be responsible for the formation of a Randall's plug composed by COM only in specific infrequent cases such as an abnormal structure of kidney. Majority of incidences of Randall's plug development by COM are caused by mechanism different from the free particle mechanism.
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Affiliation(s)
- F Grases
- Laboratory of Renal Lithiasis Research, University Institute of Health Sciences Research(IUNICS), University of Balearic Islands, Palma of Mallorca, Spain.
| | - O Söhnel
- University of J.E. Purkyně, Faculty of Environmental Studies, Ústí n.L, Czech Republic
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Scherr TF, Markwalter CF, Bauer WS, Gasperino D, Wright DW, Haselton FR. Application of mass transfer theory to biomarker capture by surface functionalized magnetic beads in microcentrifuge tubes. Adv Colloid Interface Sci 2017; 246:275-288. [PMID: 28595937 DOI: 10.1016/j.cis.2017.02.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2016] [Revised: 02/15/2017] [Accepted: 02/15/2017] [Indexed: 12/11/2022]
Abstract
In many diagnostic assays, specific biomarker extraction and purification from a patient sample is performed in microcentrifuge tubes using surface-functionalized magnetic beads. Although assay binding times are known to be highly dependent on sample viscosity, sample volume, capture reagent, and fluid mixing, the theoretical mass transport framework that has been developed and validated in engineering has yet to be applied in this context. In this work, we adapt this existing framework for simultaneous mass transfer and surface reaction and apply it to the binding of biomarkers in clinical samples to surface-functionalized magnetic beads. We discuss the fundamental fluid dynamics of vortex mixing within microcentrifuge tubes as well as describe how particles and biomolecules interact with the fluid. The model is solved over a wide range of parameters, and we present scenarios when a simplified analytical expression would be most accurate. Next, we review of some relevant techniques for model parameter estimation. Finally, we apply the mass transfer theory to practical use-case scenarios of immediate use to clinicians and assay developers. Throughout, we highlight where further characterization is necessary to bridge the gap between theory and practical application.
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Magro L, Escadafal C, Garneret P, Jacquelin B, Kwasiborski A, Manuguerra JC, Monti F, Sakuntabhai A, Vanhomwegen J, Lafaye P, Tabeling P. Paper microfluidics for nucleic acid amplification testing (NAAT) of infectious diseases. LAB ON A CHIP 2017. [PMID: 28632278 DOI: 10.1039/c7lc00013h] [Citation(s) in RCA: 77] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
The diagnosis of infectious diseases is entering a new and interesting phase. Technologies based on paper microfluidics, coupled to developments in isothermal amplification of Nucleic Acids (NAs) raise opportunities for bringing the methods of molecular biology in the field, in a low setting environment. A lot of work has been performed in the domain over the last few years and the landscape of contributions is rich and diverse. Most often, the level of sample preparation differs, along with the sample nature, the amplification and detection methods, and the design of the device, among other features. In this review, we attempt to offer a structured description of the state of the art. The domain is not mature and there exist bottlenecks that hamper the realization of Nucleic Acid Amplification Tests (NAATs) complying with the constraints of the field in low and middle income countries. In this domain however, the pace of progress is impressively fast. This review is written for a broad Lab on a Chip audience.
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Affiliation(s)
- Laura Magro
- MMN, Gulliver Laboratory, UMR CNRS 7083, ESPCI Paris, PSL Research University, Paris, France.
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Does Size Matter? Measured and Modeled Effects of Suprapubic Catheter Size on Urinary Flow. Urology 2017; 102:266.e1-266.e5. [PMID: 28131923 DOI: 10.1016/j.urology.2017.01.022] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2016] [Revised: 01/13/2017] [Accepted: 01/17/2017] [Indexed: 11/22/2022]
Abstract
OBJECTIVE To quantify the effects of catheter size and urinary sediment on catheter drainage, and to determine the French size at which catheter upsizing yields a diminished marginal return in flow. MATERIALS AND METHODS Latex Foley catheters (12-26 French [Fr]) were connected to a simulated bladder. Passive drainage times of 450 mL water were measured over 5 successive trials for each catheter size. The effect of sediment was modeled by adding 2g of infant rice cereal to the water. Measurements were repeated in half-length catheters to assess the effect of catheter length. A computational model of resistance was compared to measured data. Percent differences in catheter resistance based on measured catheter dimensions were determined. RESULTS Catheter resistance significantly decreased (P < .001) with increasing catheter size. All catheter sizes had significantly faster (P < .001) drainage times after being shortened, except for the 16 Fr catheter. All catheter sizes exhibited significantly prolonged (P < .001) drainage times after the addition of sediment, except for the 16 Fr catheter. Beyond 18 Fr, larger catheter sizes provided diminishing marginal returns in flow; upsizing from 18 Fr to 20 Fr reduced measured resistance by 19%, which was the lowest improvement in resistance between 2 catheter sizes. The coefficient of determination (R2) between measured and modeled resistances was 0.9754, confirming that the model of catheter performance was accurate. CONCLUSION Marginal improvement in urine flow occurs with catheter upsizing after 18 Fr; however, shortening catheter lengths may serve as another means of improving flow.
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Guo W, Hansson J, van der Wijngaart W. Capillary Pumping Independent of Liquid Sample Viscosity. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:12650-12655. [PMID: 27798835 DOI: 10.1021/acs.langmuir.6b03488] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Capillary flow is a dominating liquid transport phenomenon on the micro- and nanoscale. As described at the beginning of the 20th century, the flow rate during imbibition of a horizontal capillary tube follows the Washburn equation, i.e., decreases over time and depends on the viscosity of the sample. This poses a problem for capillary driven systems that rely on a predictable flow rate and where the liquid viscosity is not precisely known. Here we introduce and successfully experimentally verify the first compact capillary pump design with a flow rate constant in time and independent of the liquid viscosity that can operate over an extended period of time. We also present a detailed theoretical model for gravitation-independent capillary filling, which predicts the novel pump performance to within measurement error margins, and in which we, for the first time, explicitly identify gas inertia dominated flow as a fourth distinct flow regime in capillary pumping. These results are of potential interest for a multitude of applications and we expect our results to find most immediate applications within lab-on-a-chip systems and diagnostic devices.
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Affiliation(s)
- Weijin Guo
- KTH Royal Institute of Technology, Micro and Nanosystems, Osquldas väg 10, 100 44 Stockholm, Sweden
| | - Jonas Hansson
- KTH Royal Institute of Technology, Micro and Nanosystems, Osquldas väg 10, 100 44 Stockholm, Sweden
| | - Wouter van der Wijngaart
- KTH Royal Institute of Technology, Micro and Nanosystems, Osquldas väg 10, 100 44 Stockholm, Sweden
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Schooneveldt G, Kok HP, Balidemaj E, Geijsen ED, van Ommen F, Sijbrands J, Bakker A, de la Rosette JJMCH, Hulshof MCCM, de Reijke TM, Crezee J. Improving hyperthermia treatment planning for the pelvis by accurate fluid modeling. Med Phys 2016; 43:5442. [DOI: 10.1118/1.4961741] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
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41
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Gupta S, Wang WS, Vanapalli SA. Microfluidic viscometers for shear rheology of complex fluids and biofluids. BIOMICROFLUIDICS 2016; 10:043402. [PMID: 27478521 PMCID: PMC4947045 DOI: 10.1063/1.4955123] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2016] [Accepted: 06/21/2016] [Indexed: 05/20/2023]
Abstract
The rich diversity of man-made complex fluids and naturally occurring biofluids is opening up new opportunities for investigating their flow behavior and characterizing their rheological properties. Steady shear viscosity is undoubtedly the most widely characterized material property of these fluids. Although widely adopted, macroscale rheometers are limited by sample volumes, access to high shear rates, hydrodynamic instabilities, and interfacial artifacts. Currently, microfluidic devices are capable of handling low sample volumes, providing precision control of flow and channel geometry, enabling a high degree of multiplexing and automation, and integrating flow visualization and optical techniques. These intrinsic advantages of microfluidics have made it especially suitable for the steady shear rheology of complex fluids. In this paper, we review the use of microfluidics for conducting shear viscometry of complex fluids and biofluids with a focus on viscosity curves as a function of shear rate. We discuss the physical principles underlying different microfluidic viscometers, their unique features and limits of operation. This compilation of technological options will potentially serve in promoting the benefits of microfluidic viscometry along with evincing further interest and research in this area. We intend that this review will aid researchers handling and studying complex fluids in selecting and adopting microfluidic viscometers based on their needs. We conclude with challenges and future directions in microfluidic rheometry of complex fluids and biofluids.
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Affiliation(s)
- Siddhartha Gupta
- Department of Chemical Engineering, Texas Tech University , Lubbock, Texas 79409, USA
| | - William S Wang
- Department of Chemical Engineering, Texas Tech University , Lubbock, Texas 79409, USA
| | - Siva A Vanapalli
- Department of Chemical Engineering, Texas Tech University , Lubbock, Texas 79409, USA
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42
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Tataruch-Weinert D, Musante L, Kretz O, Holthofer H. Urinary extracellular vesicles for RNA extraction: optimization of a protocol devoid of prokaryote contamination. J Extracell Vesicles 2016; 5:30281. [PMID: 27345058 PMCID: PMC4921785 DOI: 10.3402/jev.v5.30281] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2015] [Revised: 05/17/2016] [Accepted: 05/17/2016] [Indexed: 12/20/2022] Open
Abstract
Background Urinary extracellular vesicles (UEVs) represent an ideal platform for biomarker discovery. They carry different types of RNA species, and reported profile discrepancies related to the presence/absence of 18s and 28s rRNA remain controversial. Moreover, sufficient urinary RNA yields and respective quality RNA profiles are still to be fully established. Methods UEVs were enriched by hydrostatic filtration dialysis, and RNA content was extracted using 7 different commercially available techniques. RNA quantity was assessed using spectrophotometry and fluorometry, whilst RNA quality was determined by capillary electrophoresis. Results The presence of prokaryotic transcriptome was stressed when cellular RNA, as a control, was spiked into the UEVs samples before RNA extraction. The presence of bacteria in hydrostatic filtration dialysis above 1,000 kDa molecular weight cut-off and in crude urine was confirmed with growth media plates. The efficiency in removing urinary bacteria was evaluated by differential centrifugation, filtration (0.22 µm filters) and chemical pretreatment (water purification tablet). For volumes of urine >200 ml, the chemical treatment provides ease of handling without affecting vesicle integrity, protein and RNA profiles. This protocol was selected to enrich RNA with 7 methods, and its respective quality and quantity were assessed. The results were given as follows: (a) Fluorometry gave more repeatability and reproducibility than spectrophotometry to assess the RNA yields, (b) UEVs were enriched with small RNA, (c) Ribosomal RNA peaks were not observed for any RNA extraction method used and (d) RNA yield was higher for column-based method designed for urinary exosome, whilst the highest relative microRNA presence was obtained using TRIzol method. Conclusion Our results show that the presence of bacteria can lead to misidentification in the electrophoresis peaks. Fluorometry is more reliable than spectrophotometry. RNA isolation method must be selected in conjunction with appropriate UEV collection procedure. We also suggested that a minimum 250 ml of urine should be processed to gather enough RNA for robust quantification, qualification and downstream analysis.
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Affiliation(s)
| | - Luca Musante
- Centre for BioAnalytical Sciences (CBAS), Dublin City University, Dublin, Ireland
| | - Oliver Kretz
- Huber Lab - Clinical Research Center, Renal Division-Department of Medicine, University Medical Center, Freiburg, Germany.,Department of Neuroanatomy, University of Freiburg, Freiburg, Germany
| | - Harry Holthofer
- Centre for BioAnalytical Sciences (CBAS), Dublin City University, Dublin, Ireland.,Huber Lab - Clinical Research Center, Renal Division-Department of Medicine, University Medical Center, Freiburg, Germany;
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43
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Nader CA, Pellen F, Roquefort P, Aubry T, Le Jeune B, Le Brun G, Abboud M. Evaluation of low viscosity variations in fluids using temporal and spatial analysis of the speckle pattern. OPTICS LETTERS 2016; 41:2521-2524. [PMID: 27244404 DOI: 10.1364/ol.41.002521] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The noninvasive detection of a material's viscoelasticity is of great importance in the medical field. In fact, certain diseases cause changes in tissue structure and biological fluid viscosity; tracking those changes allows for detection of these diseases. Rheological measurements are also imperative in the industrial field, where it is necessary to characterize a material's viscoelasticity for manufacturing purposes. In this Letter, we present a noncontact, noninvasive, and low cost method for determining low viscosity values and variations in fluids. Laser speckle and viscometric measurements are performed on test samples having low scattering coefficients and low viscosities. The speckle spatial analysis proved to be as accurate as the speckle temporal correlation method reported in previous studies. Very low viscosities of the order of 1 mPa.s were retrieved for the first time using speckle images with either a frame rate of 1950 fps or a single acquired image.
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Schooneveldt G, Bakker A, Balidemaj E, Chopra R, Crezee J, Geijsen ED, Hartmann J, Hulshof MC, Kok HP, Paulides MM, Sousa-Escandon A, Stauffer PR, Maccarini PF. Thermal dosimetry for bladder hyperthermia treatment. An overview. Int J Hyperthermia 2016; 32:417-33. [DOI: 10.3109/02656736.2016.1156170] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
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45
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van der Heijden AG, Dewhirst MW. Effects of hyperthermia in neutralising mechanisms of drug resistance in non-muscle-invasive bladder cancer. Int J Hyperthermia 2016; 32:434-45. [DOI: 10.3109/02656736.2016.1155761] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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46
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Sousa A, Piñeiro I, Rodríguez S, Aparici V, Monserrat V, Neira P, Carro E, Murias C, Uribarri C. Recirculant hyperthermic IntraVEsical chemotherapy (HIVEC) in intermediate–high-risk non-muscle-invasive bladder cancer. Int J Hyperthermia 2016; 32:374-80. [DOI: 10.3109/02656736.2016.1142618] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
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Corrie SR, Coffey JW, Islam J, Markey KA, Kendall MAF. Blood, sweat, and tears: developing clinically relevant protein biosensors for integrated body fluid analysis. Analyst 2016; 140:4350-64. [PMID: 25909342 DOI: 10.1039/c5an00464k] [Citation(s) in RCA: 123] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Biosensors are being developed to provide rapid, quantitative, diagnostic information to clinicians in order to help guide patient treatment, without the need for centralised laboratory assays. The success of glucose monitoring is a key example of where technology innovation has met a clinical need at multiple levels – from the pathology laboratory all the way to the patient's home. However, few other biosensor devices are currently in routine use. Here we review the challenges and opportunities regarding the integration of biosensor techniques into body fluid sampling approaches, with emphasis on the point-of-care setting.
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Affiliation(s)
- S R Corrie
- The University of Queensland, Australian Institute for Bioengineering and Nanotechnology, Delivery of Drugs and Genes Group (D2G2), St Lucia, Queensland 4072, Australia.
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48
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Chouler J, Padgett GA, Cameron PJ, Preuss K, Titirici MM, Ieropoulos I, Di Lorenzo M. Towards effective small scale microbial fuel cells for energy generation from urine. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.01.112] [Citation(s) in RCA: 67] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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49
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DeLaMarre MF, Keyzer A, Shippy SA. Development of a simple droplet-based microfluidic capillary viscometer for low-viscosity Newtonian fluids. Anal Chem 2015; 87:4649-57. [PMID: 25825941 DOI: 10.1021/acs.analchem.5b00677] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Viscosity is an easily measured macroscopic property that provides molecular information and is widely used across the sciences and engineering. Here we report a microfluidic capillary viscometer that forms droplets from aqueous samples in an immiscible carrier phase and encodes information about sample viscosity in the droplet spacing. The device shows exceptional calibration stability, with only a 0.6% drift in calibration factor from run to run, the ability to handle aqueous and nonaqueous samples, and the ability to operate with sample volumes as low as 38 nL. Operating range for aqueous sample viscosity was characterized, and was found to be 0.96-52 cP. Operating range for aqueous shear rate was found to depend on aqueous viscosity and varied from 1.9 × 10(1)-4.4 × 10(2) s(-1) for high viscosity samples to 4.1 × 10(2)-6.0 × 10(3) s(-1) for low viscosity samples. Accuracy was tested by comparing measured viscosities of several samples including crème de menthe peppermint liquor, human urine, and baby oil to viscosities of the same samples obtained with a U-tube viscometer. The device was found to be very accurate, with differences between methods as low as 0.1%. The viscometer presented requires only a basic T junction and can utilize off-chip fluorescence to measure viscosity, which could allow for easy addition of viscometric measurement capabilities to existing droplet platforms. Furthermore, the device is capable of performing measurements on Newtonian fluids without precise control over pressures or flow rates, which significantly simplifies device operation.
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Affiliation(s)
- Michael F DeLaMarre
- Department of Chemistry, University of Illinois at Chicago, Illinois 60607, United States
| | - Alec Keyzer
- Department of Chemistry, University of Illinois at Chicago, Illinois 60607, United States
| | - Scott A Shippy
- Department of Chemistry, University of Illinois at Chicago, Illinois 60607, United States
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50
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Peterson BW, He Y, Ren Y, Zerdoum A, Libera MR, Sharma PK, van Winkelhoff AJ, Neut D, Stoodley P, van der Mei HC, Busscher HJ. Viscoelasticity of biofilms and their recalcitrance to mechanical and chemical challenges. FEMS Microbiol Rev 2015; 39:234-45. [PMID: 25725015 PMCID: PMC4398279 DOI: 10.1093/femsre/fuu008] [Citation(s) in RCA: 181] [Impact Index Per Article: 20.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
We summarize different studies describing mechanisms through which bacteria in a biofilm mode of growth resist mechanical and chemical challenges. Acknowledging previous microscopic work describing voids and channels in biofilms that govern a biofilms response to such challenges, we advocate a more quantitative approach that builds on the relation between structure and composition of materials with their viscoelastic properties. Biofilms possess features of both viscoelastic solids and liquids, like skin or blood, and stress relaxation of biofilms has been found to be a corollary of their structure and composition, including the EPS matrix and bacterial interactions. Review of the literature on viscoelastic properties of biofilms in ancient and modern environments as well as of infectious biofilms reveals that the viscoelastic properties of a biofilm relate with antimicrobial penetration in a biofilm. In addition, also the removal of biofilm from surfaces appears governed by the viscoelasticity of a biofilm. Herewith, it is established that the viscoelasticity of biofilms, as a corollary of structure and composition, performs a role in their protection against mechanical and chemical challenges. Pathways are discussed to make biofilms more susceptible to antimicrobials by intervening with their viscoelasticity, as a quantifiable expression of their structure and composition. Recalcitrance of biofilms against mechanical and chemical challenges has been looked at for ages from a microbiological perspective, but an approach based on viscoelastic properties of biofilms yields new insights in this recalcitrance.
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Affiliation(s)
- Brandon W Peterson
- University of Groningen and University Medical Center Groningen, Department of Biomedical Engineering, Antonius Deusinglaan 1, 9713 AV Groningen, The Netherlands
| | - Yan He
- University of Groningen and University Medical Center Groningen, Department of Biomedical Engineering, Antonius Deusinglaan 1, 9713 AV Groningen, The Netherlands University of Groningen and University Medical Center Groningen, Department of Orthodontics, Hanzeplein 1, 9700 RB Groningen, The Netherlands
| | - Yijin Ren
- University of Groningen and University Medical Center Groningen, Department of Orthodontics, Hanzeplein 1, 9700 RB Groningen, The Netherlands
| | - Aidan Zerdoum
- Department of Chemical Engineering and Materials Science, Stevens Institute of Technology, Hoboken, NJ 07030, Hoboken, New Jersey, USA
| | - Matthew R Libera
- Department of Chemical Engineering and Materials Science, Stevens Institute of Technology, Hoboken, NJ 07030, Hoboken, New Jersey, USA
| | - Prashant K Sharma
- University of Groningen and University Medical Center Groningen, Department of Biomedical Engineering, Antonius Deusinglaan 1, 9713 AV Groningen, The Netherlands
| | - Arie-Jan van Winkelhoff
- University of Groningen and University Medical Center Groningen, Center for Dentistry and Oral Hygiene, Anatonius Deusinglaan 1, 9713 AV Groningen, The Netherlands University of Groningen and University Medical Center Groningen, Department of Medical Microbiology, Hanzeplein 1, 9700 RB, Groningen, The Netherlands
| | - Danielle Neut
- University of Groningen and University Medical Center Groningen, Department of Biomedical Engineering, Antonius Deusinglaan 1, 9713 AV Groningen, The Netherlands
| | - Paul Stoodley
- Departments of Microbial Infection and Immunity and Orthopedics, Center for Microbial Interface Biology, The Ohio State University, 460 West 12th Avenue, Columbus, OH 43210, USA National Centre for Advanced Tribology at Southampton (nCATS), Engineering Sciences, University of Southampton, SO17 1BJ, UK
| | - Henny C van der Mei
- University of Groningen and University Medical Center Groningen, Department of Biomedical Engineering, Antonius Deusinglaan 1, 9713 AV Groningen, The Netherlands
| | - Henk J Busscher
- University of Groningen and University Medical Center Groningen, Department of Biomedical Engineering, Antonius Deusinglaan 1, 9713 AV Groningen, The Netherlands
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