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Shazly T, Eberth JF, Kostelnik CJ, Uline MJ, Chitalia VC, Spinale FG, Alshareef A, Kolachalama VB. Hydrophilic Coating Microstructure Mediates Acute Drug Transfer in Drug-Coated Balloon Therapy. ACS APPLIED BIO MATERIALS 2024; 7:3041-3049. [PMID: 38661721 DOI: 10.1021/acsabm.4c00080] [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] [Indexed: 04/26/2024]
Abstract
Drug-coated balloon (DCB) therapy is a promising endovascular treatment for obstructive arterial disease. The goal of DCB therapy is restoration of lumen patency in a stenotic vessel, whereby balloon deployment both mechanically compresses the offending lesion and locally delivers an antiproliferative drug, most commonly paclitaxel (PTX) or derivative compounds, to the arterial wall. Favorable long-term outcomes of DCB therapy thus require predictable and adequate PTX delivery, a process facilitated by coating excipients that promotes rapid drug transfer during the inflation period. While a variety of excipients have been considered in DCB design, there is a lack of understanding about the coating-specific biophysical determinants of essential device function, namely, acute drug transfer. We consider two hydrophilic excipients for PTX delivery, urea (UR) and poly(ethylene glycol) (PEG), and examine how compositional and preparational variables in the balloon surface spray-coating process impact resultant coating microstructure and in turn acute PTX transfer to the arterial wall. Specifically, we use scanning electron image analyses to quantify how coating microstructure is altered by excipient solid content and balloon-to-nozzle spray distance during the coating procedure and correlate obtained microstructural descriptors of coating aggregation to the efficiency of acute PTX transfer in a one-dimensional ex vivo model of DCB deployment. Experimental results suggest that despite the qualitatively different coating surface microstructures and apparent PTX transfer mechanisms exhibited with these excipients, the drug delivery efficiency is generally enhanced by coating aggregation on the balloon surface. We illustrate this microstructure-function relation with a finite element-based computational model of DCB deployment, which along with our experimental findings suggests a general design principle to increase drug delivery efficiency across a broad range of DCB designs.
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Affiliation(s)
- Tarek Shazly
- Department of Biomedical Engineering Program, College of Engineering and Computing, University of South Carolina, Columbia, South Carolina 29208, United States
- Department of Mechanical Engineering, College of Engineering and Computing, University of South Carolina, Columbia, South Carolina 29208, United States
- Cardiovascular Translational Research Center, University of South Carolina, Columbia, South Carolina 29208, United States
| | - John F Eberth
- Biomedical Engineering, Science and Health Systems, Drexel University, Philadelphia, Pennsylvania 19104, United States
| | - Colton J Kostelnik
- Biomedical Engineering, Science and Health Systems, Drexel University, Philadelphia, Pennsylvania 19104, United States
- Aerospace Engineering and Engineering Mechanics, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Mark J Uline
- Department of Biomedical Engineering Program, College of Engineering and Computing, University of South Carolina, Columbia, South Carolina 29208, United States
- Cardiovascular Translational Research Center, University of South Carolina, Columbia, South Carolina 29208, United States
- Department of Chemical Engineering, College of Engineering and Computing, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Vipul C Chitalia
- Department of Medicine, Boston University School of Medicine, Boston, Massachusetts 02118, United States
- VA Coston Healthcare System, Boston, Massachusetts 02115, United States
| | - Francis G Spinale
- Department of Biomedical Engineering Program, College of Engineering and Computing, University of South Carolina, Columbia, South Carolina 29208, United States
- Cardiovascular Translational Research Center, University of South Carolina, Columbia, South Carolina 29208, United States
- Department of Cell Biology and Anatomy, School of Medicine, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Ahmed Alshareef
- Department of Biomedical Engineering Program, College of Engineering and Computing, University of South Carolina, Columbia, South Carolina 29208, United States
- Department of Mechanical Engineering, College of Engineering and Computing, University of South Carolina, Columbia, South Carolina 29208, United States
- Cardiovascular Translational Research Center, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Vijaya B Kolachalama
- Department of Medicine, Boston University School of Medicine, Boston, Massachusetts 02118, United States
- Department of Computer Science and Faculty of Computing & Data Sciences, Boston University, Boston, Massachusetts 02115, United States
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Pearce D, Nemcek M, Witzenburg C. Combining Unique Planar Biaxial Testing with Full-Field Thickness and Displacement Measurement for Spatial Characterization of Soft Tissues. Curr Protoc 2022; 2:e493. [PMID: 35849021 DOI: 10.1002/cpz1.493] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Soft tissues rely on the incredible complexity of their microstructure for proper function. Local variations in material properties arise as tissues develop and adapt, often in response to changes in loading. A barrier to investigating the heterogeneous nature of soft tissues is the difficulty of developing experimental protocols and analysis tools that can accurately capture spatial variations in mechanical behavior. In this article, we detail protocols enabling mechanical characterizations of anisotropic, heterogeneous soft tissues or tissue analogs. We present a series of mechanical tests designed to maximize inhomogeneous strain fields and in-plane shear forces. A customized, 3D-printable gripping system reduces tissue handling and enhances shear. High-resolution imaging and laser micrometry capture full-field displacement and thickness, respectively. As the equipment necessary to conduct these protocols is commercially available, the experimental methods presented offer an accessible route toward addressing heterogeneity. © 2022 The Authors. Current Protocols published by Wiley Periodicals LLC. Basic Protocol 1: Unique biaxial testing of soft tissues and tissue analogs Basic Protocol 2: Full-field thickness measurement of soft tissues and tissue analogs Support Protocol 1: Creating and speckling cruciform-shaped samples for mechanical testing Support Protocol 2: Creating custom gripping system to minimize sample handling.
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Affiliation(s)
- Daniel Pearce
- Department of Biomedical Engineering, University of Wisconsin-Madison, Madison, Wisconsin
| | - Mark Nemcek
- Department of Biomedical Engineering, University of Wisconsin-Madison, Madison, Wisconsin
| | - Colleen Witzenburg
- Department of Biomedical Engineering, University of Wisconsin-Madison, Madison, Wisconsin
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3
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Kurowiak J, Mackiewicz A, Klekiel T, Będziński R. Evaluation of Selected Properties of Sodium Alginate-Based Hydrogel Material—Mechanical Strength, μDIC Analysis and Degradation. MATERIALS 2022; 15:ma15031225. [PMID: 35161169 PMCID: PMC8839524 DOI: 10.3390/ma15031225] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Revised: 02/03/2022] [Accepted: 02/04/2022] [Indexed: 11/25/2022]
Abstract
The search for ideal solutions for the treatment of urethral stenosis continues. This includes developing the material, design, while maintaining its optimal and desired properties. This paper presents the results of the research conducted on sodium alginate-based hydrogel material (AHM), which may be used as a material for stents dedicated to the treatment of pathologies occurring in the genitourinary system. In order to determine the selected parameters of the AHM samples, strength and degradation tests, as well as analysis of the micro changes occurring on the surface of the material using a digital image correlation (µDIC) system, were performed. This study shows that the material possessed good mechanical strength parameters, the knowledge of which is particularly important from the point of view of the stent-tissue interaction. The degradation analysis performed showed that the AHM samples degrade in an artificial urine environment, and that the degradation time mainly depends on the chemical composition of the material. The novel µDIC method performed allowed us to characterize the homogeneity of the material structure depending on the cross-linking agent used.
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Accurate Measurement of Strain in Noncontact Surface Deformation Using Subset-Based Digital Image Correlation. CONTRAST MEDIA & MOLECULAR IMAGING 2021; 2021:4188236. [PMID: 34908910 PMCID: PMC8635938 DOI: 10.1155/2021/4188236] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/03/2021] [Revised: 10/20/2021] [Accepted: 11/01/2021] [Indexed: 11/24/2022]
Abstract
The measurement of strain using some contact techniques has some drawbacks like less accuracy and it takes larger computation time for finding each location of subpixels. Thus, a faster noncontact Digital Image Correlation (DIC) mechanism is utilized along with the traditional techniques to measure the strain. The Newton-Raphson (NR) technique is considered to be an accepted mechanism for accurate tracking of different intensity relocation. Generally, the issue regarding the DIC mechanism is its computational cost. In this paper, an interpolation technique is utilized to accomplish a high precision rate and faster image correlation; thereby it reduces the computation time required for finding the matched pixel and viably handles the rehashing relationship process. Hence, the proposed mechanism provides better efficiency along with a reduced number of iterations required for finding the identity. The number of iterations can be reduced using the Sum of Square of Subset Intensity Gradients (SSSIG) method. The evaluation of the projected scheme is tested with different images through various parameters. Finally, the outcome indicates that the projected mechanism takes only a few milliseconds to match the best matching location, whereas the prevailing techniques require 16 seconds for the same operation with the same step size. This demonstrates the effectiveness of the proposed scheme.
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Application of Digital Image Correlation in Structural Health Monitoring of Bridge Infrastructures: A Review. INFRASTRUCTURES 2021. [DOI: 10.3390/infrastructures6120176] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
A vision-based approach has been employed in Structural Health Monitoring (SHM) of bridge infrastructure. The approach has many advantages: non-contact, non-destructive, long-distance, high precision, immunity from electromagnetic interference, and multiple-target monitoring. This review aims to summarise the vision- and Digital Image Correlation (DIC)-based SHM methods for bridge infrastructure because of their strategic significance and security concerns. Four different bridge types were studied: concrete, suspension, masonry, and steel bridge. DIC applications in SHM have recently garnered attention in aiding to assess the bridges’ structural response mechanisms under loading. Different non-destructive diagnostics methods for SHM in civil infrastructure have been used; however, vision-based techniques like DIC were only developed over the last two decades, intending to facilitate damage detection in bridge systems with prompt and accurate data for efficient and sustainable operation of the bridge structure throughout its service life. Research works reviewed in this article demonstrated the DIC capability to detect damage such as cracks, spalling, and structural parameters such as deformation, strains, vibration, deflection, and rotation. In addition, the reviewed works indicated that the DIC as an efficient and reliable technique could provide sustainable monitoring solutions for different bridge infrastructures.
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Walsh DR, Lynch JJ, O' Connor DT, Newport DT, Mulvihill JJE. Mechanical and structural characterisation of the dural venous sinuses. Sci Rep 2020; 10:21763. [PMID: 33303894 PMCID: PMC7729903 DOI: 10.1038/s41598-020-78694-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Accepted: 11/26/2020] [Indexed: 12/27/2022] Open
Abstract
The dural venous sinuses play an integral role in draining venous blood from the cranial cavity. As a result of the sinuses anatomical location, they are of significant importance when evaluating the mechanopathology of traumatic brain injury (TBI). Despite the importance of the dural venous sinuses in normal neurophysiology, no mechanical analyses have been conducted on the tissues. In this study, we conduct mechanical and structural analysis on porcine dural venous sinus tissue to help elucidate the tissues’ function in healthy and diseased conditions. With longitudinal elastic moduli values ranging from 33 to 58 MPa, we demonstrate that the sinuses exhibit higher mechanical stiffness than that of native dural tissue, which may be of interest to the field of TBI modelling. Furthermore, by employing histological staining and a colour deconvolution protocol, we show that the sinuses have a collagen-dominant extracellular matrix, with collagen area fractions ranging from 84 to 94%, which likely explains the tissue’s large mechanical stiffness. In summary, we provide the first investigation of the dural venous sinus mechanical behaviour with accompanying structural analysis, which may aid in understanding TBI mechanopathology.
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Affiliation(s)
- Darragh R Walsh
- Bernal Institute, University of Limerick, Limerick, Ireland.,School of Engineering, University of Limerick, Limerick, Ireland
| | - James J Lynch
- Bernal Institute, University of Limerick, Limerick, Ireland.,School of Engineering, University of Limerick, Limerick, Ireland
| | - David T O' Connor
- Bernal Institute, University of Limerick, Limerick, Ireland.,School of Engineering, University of Limerick, Limerick, Ireland.,Health Research Institute, University of Limerick, Limerick, Ireland
| | - David T Newport
- Bernal Institute, University of Limerick, Limerick, Ireland.,School of Engineering, University of Limerick, Limerick, Ireland
| | - John J E Mulvihill
- Bernal Institute, University of Limerick, Limerick, Ireland. .,School of Engineering, University of Limerick, Limerick, Ireland. .,Health Research Institute, University of Limerick, Limerick, Ireland.
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Leng X, Zhou B, Deng X, Davis L, Sutton MA, Shazly T, Lessner SM. Determination of Viscoelastic Properties of human Carotid Atherosclerotic Plaque by Inverse Boundary Value Analysis. IOP CONFERENCE SERIES. MATERIALS SCIENCE AND ENGINEERING 2018; 381. [PMID: 31156719 PMCID: PMC6544144 DOI: 10.1088/1757-899x/381/1/012171] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
In this study, we assessed the mechanical response of samples from human atherosclerotic diseased media and fibrous cap via uniaxial tensile testing. Results show a pronounced hysteresis phenomenon caused by viscoelasticity during the loading-unloading process. An inverse analysis method with finite element modeling was employed to identify the material parameter values for a viscoelastic anisotropic (VA) constitutive model through matching simulation predictions of load-displacement curves with experimental measurements. The identified material parameter values can be used in simulation studies of diseased human carotid arteries, including investigations of inflation processes associated with stenting or angioplasty.
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Affiliation(s)
- Xiaochang Leng
- Institute of Engineering Mechanics, Nanchang University, Jiangxi, 330031, People's Republic of China
| | - Boran Zhou
- Department of Radiology, Mayo Clinic, Rochester, MN 55905
| | - Xiaomin Deng
- College of Engineering and Computing, Department of Mechanical Engineering, University of South Carolina, Columbia, SC 29208
| | - Lindsey Davis
- College of Engineering and Computing, Biomedical Engineering Program, University of South Carolina, Columbia, SC 29208
| | - Michael A Sutton
- College of Engineering and Computing, Department of Mechanical Engineering, University of South Carolina, Columbia, SC 29208.,College of Engineering and Computing, Biomedical Engineering Program, University of South Carolina, Columbia, SC 29208
| | - Tarek Shazly
- College of Engineering and Computing, Department of Mechanical Engineering, University of South Carolina, Columbia, SC 29208.,College of Engineering and Computing, Biomedical Engineering Program, University of South Carolina, Columbia, SC 29208
| | - Susan M Lessner
- College of Engineering and Computing, Biomedical Engineering Program, University of South Carolina, Columbia, SC 29208.,School of Medicine, Department of Cell Biology & Anatomy, University of South Carolina, Columbia, SC 29208
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