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Salaris N, Chen W, Haigh P, Caciolli L, Giobbe GG, De Coppi P, Papakonstantinou I, Tiwari MK. Nonwoven fiber meshes for oxygen sensing. Biosens Bioelectron 2024; 255:116198. [PMID: 38555771 DOI: 10.1016/j.bios.2024.116198] [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: 10/12/2023] [Revised: 03/05/2024] [Accepted: 03/07/2024] [Indexed: 04/02/2024]
Abstract
Accurate oxygen sensing and cost-effective fabrication are crucial for the adoption of wearable devices inside and outside the clinical setting. Here we introduce a simple strategy to create nonwoven polymeric fibrous mats for a notable contribution towards addressing this need. Although morphological manipulation of polymers for cell culture proliferation is commonplace, especially in the field of regenerative medicine, non-woven structures have not been used for oxygen sensing. We used an airbrush spraying, i.e. solution blowing, to obtain nonwoven fiber meshes embedded with a phosphorescent dye. The fibers serve as a polymer host for the phosphorescent dye and are shown to be non-cytotoxic. Different composite fibrous meshes were prepared and favorable mechanical and oxygen-sensing properties were demonstrated. A Young's modulus of 9.8 MPa was achieved and the maximum oxygen sensitivity improved by a factor of ∼2.9 compared to simple drop cast film. The fibers were also coated with silicone rubbers to produce mechanically robust sensing films. This reduced the sensing performance but improved flexibility and mechanical properties. Lastly, we are able to capture oxygen concentration maps via colorimetry using a smartphone camera, which should offer unique advantages in wider usage. Overall, the introduced composite fiber meshes show a potential to significantly improve cell cultures and healthcare monitoring via absolute oxygen sensing.
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Affiliation(s)
- Nikolaos Salaris
- Nanoengineered Systems Laboratory, UCL Mechanical Engineering, University College London, London, WC1E 7JE, United Kingdom; Wellcome/EPSRC Centre for Interventional and Surgical Sciences-WEISS, University College London, London, W1W 7TS, United Kingdom
| | - Wenqing Chen
- Nanoengineered Systems Laboratory, UCL Mechanical Engineering, University College London, London, WC1E 7JE, United Kingdom; Wellcome/EPSRC Centre for Interventional and Surgical Sciences-WEISS, University College London, London, W1W 7TS, United Kingdom
| | - Paul Haigh
- School of Engineering, Newcastle University, Newcastle, NE1 7RU, United Kingdom
| | - Lorenzo Caciolli
- Wellcome/EPSRC Centre for Interventional and Surgical Sciences-WEISS, University College London, London, W1W 7TS, United Kingdom; NIHR Biomedical Research Centre, Stem Cells and Regenerative Medicine, Developmental Biology and Cancer Programme, UCL GOS ICH Zayed Centre for Research Into Rare Disease in Children, 20 Guilford Street, London, WC1N 1DZ, United Kingdom
| | - Giovanni Giuseppe Giobbe
- NIHR Biomedical Research Centre, Stem Cells and Regenerative Medicine, Developmental Biology and Cancer Programme, UCL GOS ICH Zayed Centre for Research Into Rare Disease in Children, 20 Guilford Street, London, WC1N 1DZ, United Kingdom
| | - Paolo De Coppi
- NIHR Biomedical Research Centre, Stem Cells and Regenerative Medicine, Developmental Biology and Cancer Programme, UCL GOS ICH Zayed Centre for Research Into Rare Disease in Children, 20 Guilford Street, London, WC1N 1DZ, United Kingdom; Dept. of Specialist Neonatal and Paediatric Surgery, Great Ormond Street Hospital, London, UK
| | - Ioannis Papakonstantinou
- Photonic Innovations Lab, Department of Electronic and Electrical Engineering, University College London, London, WC1E 7JE, United Kingdom
| | - Manish K Tiwari
- Nanoengineered Systems Laboratory, UCL Mechanical Engineering, University College London, London, WC1E 7JE, United Kingdom; Wellcome/EPSRC Centre for Interventional and Surgical Sciences-WEISS, University College London, London, W1W 7TS, United Kingdom.
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2
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Sirolli S, Guarnera D, Ricotti L, Cafarelli A. Triggerable Patches for Medical Applications. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024:e2310110. [PMID: 38860756 DOI: 10.1002/adma.202310110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Revised: 06/05/2024] [Indexed: 06/12/2024]
Abstract
Medical patches have garnered increasing attention in recent decades for several diagnostic and therapeutic applications. Advancements in material science, manufacturing technologies, and bioengineering have significantly widened their functionalities, rendering them highly versatile platforms for wearable and implantable applications. Of particular interest are triggerable patches designed for drug delivery and tissue regeneration purposes, whose action can be controlled by an external signal. Stimuli-responsive patches are particularly appealing as they may enable a high level of temporal and spatial control over the therapy, allowing high therapeutic precision and the possibility to adjust the treatment according to specific clinical and personal needs. This review aims to provide a comprehensive overview of the existing extensive literature on triggerable patches, emphasizing their potential for diverse applications and highlighting the strengths and weaknesses of different triggering stimuli. Additionally, the current open challenges related to the design and use of efficient triggerable patches, such as tuning their mechanical and adhesive properties, ensuring an acceptable trade-off between smartness and biocompatibility, endowing them with portability and autonomy, accurately controlling their responsiveness to the triggering stimulus and maximizing their therapeutic efficacy, are reviewed.
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Affiliation(s)
- Sofia Sirolli
- The BioRobotics Institute, Scuola Superiore Sant'Anna, Piazza Martiri della Libertà 33, Pisa, 56127, Italy
- Department of Excellence in Robotics & AI, Scuola Superiore Sant'Anna, Piazza Martiri della Libertà 33, Pisa, 56127, Italy
| | - Daniele Guarnera
- The BioRobotics Institute, Scuola Superiore Sant'Anna, Piazza Martiri della Libertà 33, Pisa, 56127, Italy
- Department of Excellence in Robotics & AI, Scuola Superiore Sant'Anna, Piazza Martiri della Libertà 33, Pisa, 56127, Italy
| | - Leonardo Ricotti
- The BioRobotics Institute, Scuola Superiore Sant'Anna, Piazza Martiri della Libertà 33, Pisa, 56127, Italy
- Department of Excellence in Robotics & AI, Scuola Superiore Sant'Anna, Piazza Martiri della Libertà 33, Pisa, 56127, Italy
| | - Andrea Cafarelli
- The BioRobotics Institute, Scuola Superiore Sant'Anna, Piazza Martiri della Libertà 33, Pisa, 56127, Italy
- Department of Excellence in Robotics & AI, Scuola Superiore Sant'Anna, Piazza Martiri della Libertà 33, Pisa, 56127, Italy
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3
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Youssef K, Ullah A, Rezai P, Hasan A, Amirfazli A. Recent advances in biosensors for real time monitoring of pH, temperature, and oxygen in chronic wounds. Mater Today Bio 2023; 22:100764. [PMID: 37674780 PMCID: PMC10477692 DOI: 10.1016/j.mtbio.2023.100764] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2023] [Revised: 07/16/2023] [Accepted: 08/05/2023] [Indexed: 09/08/2023] Open
Abstract
Chronic wounds are among the major healthcare issues affecting millions of people worldwide with high rates of morbidity, losses of limbs and mortality. Microbial infection in wounds is a severe problem that can impede healing of chronic wounds. Accurate, timely and early detection of infections, and real time monitoring of various wound healing biomarkers related to infection can be significantly helpful in the treatment and care of chronic wounds. However, clinical methodologies of periodic assessment and care of wounds require physical visit to wound care clinics or hospitals and time-consuming frequent replacement of wound dressing patches, which also often adversely affect the healing process. Besides, frequent replacements of wound dressings are highly expensive, causing a huge amount of burden on the national health care systems. Smart bandages have emerged to provide in situ physiochemical surveillance in real time at the wound site. These bandages integrate smart sensors to detect the condition of wound infection based on various parameters, such as pH, temperature and oxygen level in the wound which reduces the frequency of changing the wound dressings and its associated complications. These devices can continually monitor the healing process, paving the way for tailored therapy and improved quality of patient's life. In this review, we present an overview of recent advances in biosensors for real time monitoring of pH, temperature, and oxygen in chronic wounds in order to assess infection status. We have elaborated the recent progress in quantitative monitoring of several biomarkers important for assessing wounds infection status and its detection using smart biosensors. The review shows that real-time monitoring of wound status by quantifying specific biomarkers, such as pH, temperature and tissue oxygenation to significantly aid the treatment and care of chronic infected wounds.
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Affiliation(s)
- Khaled Youssef
- Department of Mechanical Engineering, York University, Toronto, ON, Canada
| | - Asad Ullah
- Department of Mechanical and Industrial Engineering, Qatar University, Doha, 2713, Qatar
- Biomedical Research Center, Qatar University, Doha, 2713, Qatar
| | - Pouya Rezai
- Department of Mechanical Engineering, York University, Toronto, ON, Canada
| | - Anwarul Hasan
- Department of Mechanical and Industrial Engineering, Qatar University, Doha, 2713, Qatar
- Biomedical Research Center, Qatar University, Doha, 2713, Qatar
| | - Alidad Amirfazli
- Department of Mechanical Engineering, York University, Toronto, ON, Canada
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Mirani B, Hadisi Z, Pagan E, Dabiri SMH, van Rijt A, Almutairi L, Noshadi I, Armstrong DG, Akbari M. Smart Dual-Sensor Wound Dressing for Monitoring Cutaneous Wounds. Adv Healthc Mater 2023; 12:e2203233. [PMID: 36929644 DOI: 10.1002/adhm.202203233] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2022] [Revised: 02/24/2023] [Indexed: 03/18/2023]
Abstract
Managing slow-healing wounds and associated complications is challenging, time-consuming, and expensive. Systematic collection, analysis, and dissemination of correct wound status data are critical for enhancing healing outcomes and reducing complications. However, traditional data collection approaches are often neither accurate nor user-friendly and require diverse skill levels, resulting in the collection of inconsistent and unreliable data. As an advancement to the authors' previously developed hydrogel-based smart wound dressing, here is reported an enhanced integration of drug delivery and sensing (pH and glucose) modules for accelerated treatment and continuous monitoring of cutaneous wounds. In the current study, growth factor delivery modules and an array of colorimetric glucose sensors are incorporated into the dressing to promote wound healing and extend the dressing's utility for diabetic wound treatment. Furthermore, the efficacy of the wound dressing in monitoring infection and supporting wound healing via antibiotic and growth factor delivery is investigated in mice models. The updated dressing reveals excellent healing benefits on non-infected and infected wounds, as well as real-time monitoring and early detection of wound infection.
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Affiliation(s)
- Bahram Mirani
- Laboratory for Innovations in Microengineering (LiME), Department of Mechanical Engineering, University of Victoria, Victoria, BC, V8P 5C2, Canada
- Center for Advanced Materials and Related Technologies (CAMTEC), University of Victoria, Victoria, BC, V8P 5C2, Canada
| | - Zhina Hadisi
- Laboratory for Innovations in Microengineering (LiME), Department of Mechanical Engineering, University of Victoria, Victoria, BC, V8P 5C2, Canada
- Center for Advanced Materials and Related Technologies (CAMTEC), University of Victoria, Victoria, BC, V8P 5C2, Canada
| | - Erik Pagan
- Laboratory for Innovations in Microengineering (LiME), Department of Mechanical Engineering, University of Victoria, Victoria, BC, V8P 5C2, Canada
- Center for Advanced Materials and Related Technologies (CAMTEC), University of Victoria, Victoria, BC, V8P 5C2, Canada
| | - Seyed Mohammad Hossein Dabiri
- Laboratory for Innovations in Microengineering (LiME), Department of Mechanical Engineering, University of Victoria, Victoria, BC, V8P 5C2, Canada
- Center for Advanced Materials and Related Technologies (CAMTEC), University of Victoria, Victoria, BC, V8P 5C2, Canada
| | - Antonia van Rijt
- Laboratory for Innovations in Microengineering (LiME), Department of Mechanical Engineering, University of Victoria, Victoria, BC, V8P 5C2, Canada
| | - Lama Almutairi
- Laboratory for Innovations in Microengineering (LiME), Department of Mechanical Engineering, University of Victoria, Victoria, BC, V8P 5C2, Canada
| | - Iman Noshadi
- Department of Bioengineering, University of California, Riverside, CA, 92507, USA
| | - David G Armstrong
- Southwestern Academic Limb Salvage Alliance (SALSA), Department of Surgery, Keck School of Medicine of University of Southern California, Los Angeles, CA, 90033, USA
| | - Mohsen Akbari
- Laboratory for Innovations in Microengineering (LiME), Department of Mechanical Engineering, University of Victoria, Victoria, BC, V8P 5C2, Canada
- Center for Advanced Materials and Related Technologies (CAMTEC), University of Victoria, Victoria, BC, V8P 5C2, Canada
- Terasaki Institute for Biomedical Innovation, Los Angeles, CA, 90064, USA
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Bakhrushina EO, Shumkova MM, Sergienko FS, Novozhilova EV, Demina NB. Spray Film-Forming systems as promising topical in situ Systems: A review. Saudi Pharm J 2023; 31:154-169. [PMID: 36685308 PMCID: PMC9845128 DOI: 10.1016/j.jsps.2022.11.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Accepted: 11/18/2022] [Indexed: 11/24/2022] Open
Abstract
Spray film-forming systems (SFFSs) provide great potential for the treatment of various types of wounds. Such systems afford to prolong the action of active substances, to prevent cross-contamination, and to ensure accelerated wound healing. Spray films are known since the mid-20th century, and nowadays they are widely used to treat minor skin injuries, but numerous clinical cases describe their successful use in the treatment of burns, wounds, bedsores, etc. The current level of polymer development and composite synthesis has greatly expanded the possibilities of creating compositions of spray film-forming systems. Scattered information and lack of standardization of such delivery systems creates difficulties for pharmaceutical development. This review highlights most of the existing requirements and suggestions from studies to standardize the characteristics of SFFSs and classify them based on scientific sources and regulatory documentation, as well as the position of such systems in the pharmaceutical market. The search and evaluation of known characterization methods and their modifications, as well as the approval of their list (separately for development and for standardization) can potentially increase the research interest in the problem of spray film-forming systems development and contribute to the registration of new drugs and medical devices in this promising dosage form, including with its own pharmacological effect.
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Marks HL, Cook K, Roussakis E, Cascales JP, Korunes‐Miller JT, Grinstaff MW, Evans CL. Quantitative Luminescence Photography of a Swellable Hydrogel Dressing with a Traffic-Light Response to Oxygen. Adv Healthc Mater 2022; 11:e2101605. [PMID: 35120400 DOI: 10.1002/adhm.202101605] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Revised: 12/24/2021] [Indexed: 12/19/2022]
Abstract
Sensor-integrated wound dressings are emerging tools applicable to a wide variety of medical applications from emergency triage to at-home monitoring. Uncomfortable, unnecessary wound dressing changes may be avoided by providing quantitative insight into tissue characteristics related to wound healing such as tissue oxygenation, pH, and exudate/transudate volume. Here, a simple cost-effective methodology for quantifying oxygen and pH in a swellable hydrogel dressing using a single photograph is presented. The red and green luminescence of a novel dendritic polyamine Pt-porphyrin and fluorescein conjugate quantitatively responds to oxygen and pH, respectively, and enables robust sensing. The porphyrin conjugate, when combined with a four-arm star polyethylene glycol (PEG) amine polymer, rapidly crosslinks at room temperature with an N-hydroxysuccinimide (NHS)-PEG crosslinker to form a color-changing hydrogel dressing with tunable swelling capabilities applicable to a variety of wound environments. An inexpensive digital single-lens reflex (DSLR) camera modified with bandpass filters captures the hydrogel luminescence using simple macroscopic photography, and conversion to HSB colorspace allows for intensity-independent image analysis of the hydrogels' dual modality response. The hydrogel formulation exhibits a robust and validated visible red-orange-green "traffic light" spectrum in response to oxygen changes, regardless of swelling state, pH, or autofluorescence from skin, thereby enabling the clinician friendly naked-eye feedback.
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Affiliation(s)
- Haley L. Marks
- Wellman Center for Photomedicine Massachusetts General Hospital Harvard Medical School Boston MA 02129 USA
| | - Katherine Cook
- Department of Chemistry Boston University Boston MA 02215 USA
| | - Emmanuel Roussakis
- Wellman Center for Photomedicine Massachusetts General Hospital Harvard Medical School Boston MA 02129 USA
| | - Juan Pedro Cascales
- Wellman Center for Photomedicine Massachusetts General Hospital Harvard Medical School Boston MA 02129 USA
| | | | - Mark W. Grinstaff
- Department of Chemistry Boston University Boston MA 02215 USA
- Department of Biomedical Engineering Boston University Boston MA 02215 USA
| | - Conor L. Evans
- Wellman Center for Photomedicine Massachusetts General Hospital Harvard Medical School Boston MA 02129 USA
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Bose M, Hagerty J, Boes J, Kim CS, Stoecker W, Nam P. Optical Oxygen Sensor Patch Printed with Polystyrene Microparticles-based Ink on Flexible Substrate. IEEE SENSORS JOURNAL 2021; 21:21494-21502. [PMID: 35002540 PMCID: PMC8730360 DOI: 10.1109/jsen.2021.3105655] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Optical oxygen sensors based on photoluminescence quenching have gained increasing attention as a superior method for continuous monitoring of oxygen in a growing number of applications. A simple and low-cost fabrication technique was developed to produce sensor arrays capable of two-dimensional oxygen tension measurement. Sensor patches were printed on polyvinylidene chloride film using an oxygen-sensitive ink cocktail, prepared by immobilizing Pt(II) mesotetra(pentafluorophenyl)porphine (PtTFPP) in monodispersed polystyrene microparticles. The dispersion media of the ink cocktail, high molecular weight polyvinyl pyrrolidone suspended in 50% ethanol (v/v in water), allowed adhesion promotion and compatibility with most common polymeric substrates. Ink phosphorescence intensity was found to vary primarily with fluorophore concentration and to a lesser extent with polystyrene particle size. The sensor performance was investigated as a function of oxygen concentrations employing two different techniques: a multi-frequency phase fluorometer and smart phone-based image acquisition. The printed sensor patch showed fast and repetitive response over 0-21% oxygen concentrations with high linearity (with R2 >0.99) in a Stern-Volmer plot, and sensitivity of I0/I21 >1.55. The optical sensor response on a surface was investigated further using two-dimensional images which were captured and analyzed under different oxygen environment. Printed sensor patch along with imaging read-out technique make an ideal platform for early detection of surface wounds associated with tissue oxygen.
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Affiliation(s)
- Mousumi Bose
- Department of Chemistry, Missouri University of Science and Technology, Rolla, MO 65409 USA
| | - Jason Hagerty
- Department of Electrical and Computer Engineering, Missouri University of Science and Technology, Rolla, MO 65409 USA
| | - Jason Boes
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523 USA
| | - Chang-Soo Kim
- Department of Electrical and Computer Engineering, Missouri University of Science and Technology, Rolla, MO 65409 USA
| | | | - Paul Nam
- Department of Chemistry, Missouri University of Science and Technology, Rolla, MO 65409 USA
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Abstract
OBJECTIVE Oxygen is essential to wound healing; therefore, accurate monitoring can guide clinical decisions. Clinical wound assessment is often subjective, and tools to monitor wound oxygen are typically expensive, indirect, and highly variable. This study demonstrates the utility of a novel, low-cost oxygen-sensing thin film for serial assessment of wound oxygenation. DESIGN Dual-layer films were fabricated with boron oxygen-sensing nanoparticles (BNPs) impregnated into a chitosan-polycaprolactone layer for direct wound bed contact with a relatively oxygen impermeable calcium alginate surface layer. The BNPs are a dual-emissive difluoroboron β-diketonate dye incorporated into poly(lactic acid) nanoparticles. Under UV excitation, the BNPs emit fluorescence based on concentration and oxygen-sensitive phosphorescence. The fluorescence/phosphorescence ratio is directly proportional to oxygen concentration. METHODS A series of in vitro oxygen challenges and in vivo murine and porcine wound healing models were used to validate the utility of the film in sensing wound oxygenation. MAIN RESULTS In vitro testing demonstrated the oxygen-sensing capability of the BNP film and its ability to shield ambient oxygen to isolate wound oxygen. In vivo testing demonstrated the ability of the film to accurately monitor relative oxygen changes in a murine wound over time, measuring a 22% fluorescence/phosphorescence increase during acute healing. CONCLUSIONS This study presents a low-cost, noninvasive, direct, and serial oxygen mapping technology to detect spatial differences in wound oxygenation. Clinical use of the films has the potential to monitor wound healing trajectories and guide wound care decisions.
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O'Callaghan S, Galvin P, O'Mahony C, Moore Z, Derwin R. 'Smart' wound dressings for advanced wound care: a review. J Wound Care 2021; 29:394-406. [PMID: 32654609 DOI: 10.12968/jowc.2020.29.7.394] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Hard-to-heal wounds are a common side-effect of diabetes, obesity, pressure ulcers and age-related vascular diseases, the incidences of which are growing worldwide. The increasing financial burden of hard-to-heal wounds on global health services has provoked technological research into improving wound diagnostics and therapeutics via 'smart' dressings, within which elements such as microelectronic sensors, microprocessors and wireless communication radios are embedded. This review highlights the progress being made by research groups worldwide in producing 'smart' wound device prototypes. Significant advances have been made, for example, flexible substrates have replaced rigid circuit boards, sensors have been printed on commercial wound dressing materials and wireless communication has been demonstrated. Challenges remain, however, in the areas of power supply, disposability, low-profile components, multiparametric sensing and seamless device integration in commercial wound dressings.
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Affiliation(s)
- Suzanne O'Callaghan
- Department of Life Sciences Interface, Tyndall National Institute, University College Cork, Ireland
| | - Paul Galvin
- Department of Life Sciences Interface, Tyndall National Institute, University College Cork, Ireland
| | - Conor O'Mahony
- Department of Life Sciences Interface, Tyndall National Institute, University College Cork, Ireland
| | - Zena Moore
- Royal College of Surgeons in Ireland, School of Nursing, 123 St. Stephen's Green, Dublin 2 Dublin, Ireland.,Monash University, Melbourne, Australia.,Ghent University, Belgium.,Lida Institute, Shanghai, China.,University of Wales, Cardiff, Wales
| | - Rosemarie Derwin
- Royal College of Surgeons in Ireland, School of Nursing, 123 St. Stephen's Green, Dublin 2 Dublin, Ireland
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Zhuang M, Joshi S, Sun H, Batabyal T, Fraser CL, Kapur J. Difluoroboron β-diketonate polylactic acid oxygen nanosensors for intracellular neuronal imaging. Sci Rep 2021; 11:1076. [PMID: 33441771 PMCID: PMC7806623 DOI: 10.1038/s41598-020-80172-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2020] [Accepted: 12/17/2020] [Indexed: 11/08/2022] Open
Abstract
Critical for metabolism, oxygen plays an essential role in maintaining the structure and function of neurons. Oxygen sensing is important in common neurological disorders such as strokes, seizures, or neonatal hypoxic-ischemic injuries, which result from an imbalance between metabolic demand and oxygen supply. Phosphorescence quenching by oxygen provides a non-invasive optical method to measure oxygen levels within cells and tissues. Difluoroboron β-diketonates are a family of luminophores with high quantum yields and tunable fluorescence and phosphorescence when embedded in certain rigid matrices such as poly (lactic acid) (PLA). Boron nanoparticles (BNPs) can be fabricated from dye-PLA materials for oxygen mapping in a variety of biological milieu. These dual-emissive nanoparticles have oxygen-insensitive fluorescence, oxygen-sensitive phosphorescence, and rigid matrix all in one, enabling real-time ratiometric oxygen sensing at micron-level spatial and millisecond-level temporal resolution. In this study, BNPs are applied in mouse brain slices to investigate oxygen distributions and neuronal activity. The optical properties and physical stability of BNPs in a biologically relevant buffer were stable. Primary neuronal cultures were labeled by BNPs and the mitochondria membrane probe MitoTracker Red FM. BNPs were taken up by neuronal cell bodies, at dendrites, and at synapses, and the localization of BNPs was consistent with that of MitoTracker Red FM. The brain slices were stained with the BNPs, and the BNPs did not significantly affect the electrophysiological properties of neurons. Oxygen maps were generated in living brain slices where oxygen is found to be mostly consumed by mitochondria near synapses. Finally, the BNPs exhibited excellent response when the conditions varied from normoxic to hypoxic and when the neuronal activity was increased by increasing K+ concentration. This work demonstrates the capability of BNPs as a non-invasive tool in oxygen sensing and could provide fundamental insight into neuronal mechanisms and excitability research.
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Affiliation(s)
- Meng Zhuang
- Department of Chemistry, University of Virginia, Charlottesville, VA, 22904, USA
| | - Suchitra Joshi
- Department of Neurology, University of Virginia, Charlottesville, VA, 22903, USA
| | - Huayu Sun
- Department of Neurology, University of Virginia, Charlottesville, VA, 22903, USA
| | - Tamal Batabyal
- Department of Neurology, University of Virginia, Charlottesville, VA, 22903, USA
| | - Cassandra L Fraser
- Department of Chemistry, University of Virginia, Charlottesville, VA, 22904, USA.
| | - Jaideep Kapur
- Department of Neurology, University of Virginia, Charlottesville, VA, 22903, USA.
- Department of Neuroscience, University of Virginia, Charlottesville, VA, 22903, USA.
- UVA Brain Institute, University of Virginia, Charlottesville, VA, 22903, USA.
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11
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NIH Workshop 2018: Towards Minimally Invasive or Noninvasive Approaches to Assess Tissue Oxygenation Pre- and Post-transfusion. Transfus Med Rev 2020; 35:46-55. [PMID: 33353783 DOI: 10.1016/j.tmrv.2020.12.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2020] [Revised: 12/01/2020] [Accepted: 12/02/2020] [Indexed: 12/12/2022]
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Cascales JP, Roussakis E, Witthauer L, Goss A, Li X, Chen Y, Marks HL, Evans CL. Wearable device for remote monitoring of transcutaneous tissue oxygenation. BIOMEDICAL OPTICS EXPRESS 2020; 11:6989-7002. [PMID: 33408975 PMCID: PMC7747925 DOI: 10.1364/boe.408850] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Revised: 10/30/2020] [Accepted: 11/02/2020] [Indexed: 06/12/2023]
Abstract
Wearable devices have found widespread applications in recent years as both medical devices as well as consumer electronics for sports and health tracking. A metric of health that is often overlooked in currently available technology is the direct measurement of molecular oxygen in living tissue, a key component in cellular energy production. Here, we report on the development of a wireless wearable prototype for transcutaneous oxygenation monitoring based on quantifying the oxygen-dependent phosphorescence of a metalloporphyrin embedded within a highly breathable oxygen sensing film. The device is completely self-contained, weighs under 30 grams, performs on-board signal analysis, and can communicate with computers or smartphones. The wearable measures tissue oxygenation at the skin surface by detecting the lifetime and intensity of phosphorescence, which undergoes quenching in the presence of oxygen. As well as being insensitive to motion artifacts, it offers robust and reliable measurements even in variable atmospheric conditions related to temperature and humidity. Preliminary in vivo testing in a porcine ischemia model shows that the wearable is highly sensitive to changes in tissue oxygenation in the physiological range upon inducing a decrease in limb perfusion.
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13
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Marks H, Bucknor A, Roussakis E, Nowell N, Kamali P, Cascales JP, Kazei D, Lin SJ, Evans CL. A paintable phosphorescent bandage for postoperative tissue oxygen assessment in DIEP flap reconstruction. SCIENCE ADVANCES 2020; 6:eabd1061. [PMID: 33355131 PMCID: PMC11206211 DOI: 10.1126/sciadv.abd1061] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2020] [Accepted: 11/17/2020] [Indexed: 06/12/2023]
Abstract
Flaps are common in plastic surgery to reconstruct large tissue defects in cases such as trauma or cancer. However, most tissue oximeters used for monitoring ischemia in postoperative flaps are bulky, wired devices, which hinder direct flap observation. Here, we present the results of a clinical trial using a previously untried paintable transparent phosphorescent bandage to assess the tissue's partial pressure of oxygen (pO2). Statistical analysis revealed a strong relationship (P < 0.0001) between the rates of change of tissue oxygenation measured by the bandage and blood oxygen saturation (%stO2) readings from a standard-of-care ViOptix near-infrared spectroscopy oximeter. In addition, the oxygen-sensing bandage showed no adverse effects, proved easy handling, and yielded bright images across all skin tones with a digital single-lens reflex (DSLR) camera. This demonstrates the feasibility of using phosphorescent materials to monitor flaps postoperatively and lays the groundwork for future exploration in other tissue oxygen sensing applications.
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Affiliation(s)
- Haley Marks
- Wellman Center for Photomedicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02129, USA
| | - Alexandra Bucknor
- Division of Plastic Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA
| | - Emmanuel Roussakis
- Wellman Center for Photomedicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02129, USA
| | - Nicholas Nowell
- Wellman Center for Photomedicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02129, USA
| | - Parisa Kamali
- Division of Plastic Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA
| | - Juan Pedro Cascales
- Wellman Center for Photomedicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02129, USA
| | - Darya Kazei
- Division of Plastic Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA
| | - Samuel J Lin
- Division of Plastic Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA.
| | - Conor L Evans
- Wellman Center for Photomedicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02129, USA.
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Roblyer D. Perspective on the increasing role of optical wearables and remote patient monitoring in the COVID-19 era and beyond. JOURNAL OF BIOMEDICAL OPTICS 2020; 25:JBO-200273-PER. [PMID: 33089674 PMCID: PMC7575829 DOI: 10.1117/1.jbo.25.10.102703] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Accepted: 10/01/2020] [Indexed: 05/13/2023]
Abstract
SIGNIFICANCE The COVID-19 pandemic is changing the landscape of healthcare delivery in many countries, with a new shift toward remote patient monitoring (RPM). AIM The goal of this perspective is to highlight the existing and future role of wearable and RPM optical technologies in an increasingly at-home healthcare and research environment. APPROACH First, the specific changes occurring during the COVID-19 pandemic in healthcare delivery, regulations, and technological innovations related to RPM technologies are reviewed. Then, a review of the current state and potential future impact of optical physiological monitoring in portable and wearable formats is outlined. RESULTS New efforts from academia, industry, and regulatory agencies are advancing and encouraging at-home, portable, and wearable physiological monitors as a growing part of healthcare delivery. It is hoped that these shifts will assist with disease diagnosis, treatment, management, recovery, and rehabilitation with minimal in-person contact. Some of these trends are likely to persist for years to come. Optical technologies already account for a large portion of RPM platforms, with a good potential for future growth. CONCLUSIONS The biomedical optics community has a potentially large role to play in developing, testing, and commercializing new wearable and RPM technologies to meet the changing healthcare and research landscape in the COVID-19 era and beyond.
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Affiliation(s)
- Darren Roblyer
- Boston University, Department of Biomedical Engineering, Boston, Massachusetts, United States
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15
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Roussakis E, Cascales JP, Marks HL, Li X, Grinstaff M, Evans CL. Humidity‐Insensitive Tissue Oxygen Tension Sensing for Wearable Devices
†. Photochem Photobiol 2020; 96:373-379. [DOI: 10.1111/php.13198] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2019] [Revised: 10/22/2019] [Accepted: 11/16/2019] [Indexed: 12/25/2022]
Affiliation(s)
- Emmanuel Roussakis
- Wellman Center for Photomedicine Massachusetts General Hospital Harvard Medical School Boston MA
| | - Juan Pedro Cascales
- Wellman Center for Photomedicine Massachusetts General Hospital Harvard Medical School Boston MA
| | - Haley L. Marks
- Wellman Center for Photomedicine Massachusetts General Hospital Harvard Medical School Boston MA
| | - Xiaolei Li
- Wellman Center for Photomedicine Massachusetts General Hospital Harvard Medical School Boston MA
| | - Mark Grinstaff
- Departments of Biomedical Engineering and Chemistry Boston University Boston MA
| | - Conor L. Evans
- Wellman Center for Photomedicine Massachusetts General Hospital Harvard Medical School Boston MA
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16
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Ji S, Zhou S, Zhang X, Li C, Chen W, Jiang X. Oxygen-Sensing Probes and Bandage for Optical Detection of Inflammation. ACS APPLIED BIO MATERIALS 2019; 2:5110-5117. [DOI: 10.1021/acsabm.9b00775] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Shilu Ji
- MOE Key Laboratory of High Performance Polymer Materials and Technology, Department of Polymer Science & Engineering, College of Chemistry & Chemical Engineering, and Jiangsu Key Laboratory for Nanotechnology, Nanjing University, Nanjing 210093, P. R. China
| | - Sensen Zhou
- MOE Key Laboratory of High Performance Polymer Materials and Technology, Department of Polymer Science & Engineering, College of Chemistry & Chemical Engineering, and Jiangsu Key Laboratory for Nanotechnology, Nanjing University, Nanjing 210093, P. R. China
| | - Xiaoke Zhang
- MOE Key Laboratory of High Performance Polymer Materials and Technology, Department of Polymer Science & Engineering, College of Chemistry & Chemical Engineering, and Jiangsu Key Laboratory for Nanotechnology, Nanjing University, Nanjing 210093, P. R. China
| | - Cheng Li
- MOE Key Laboratory of High Performance Polymer Materials and Technology, Department of Polymer Science & Engineering, College of Chemistry & Chemical Engineering, and Jiangsu Key Laboratory for Nanotechnology, Nanjing University, Nanjing 210093, P. R. China
| | - Weizhi Chen
- MOE Key Laboratory of High Performance Polymer Materials and Technology, Department of Polymer Science & Engineering, College of Chemistry & Chemical Engineering, and Jiangsu Key Laboratory for Nanotechnology, Nanjing University, Nanjing 210093, P. R. China
| | - Xiqun Jiang
- MOE Key Laboratory of High Performance Polymer Materials and Technology, Department of Polymer Science & Engineering, College of Chemistry & Chemical Engineering, and Jiangsu Key Laboratory for Nanotechnology, Nanjing University, Nanjing 210093, P. R. China
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17
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Roussakis E, Ortines RV, Pinsker BL, Mooers CT, Evans CL, Miller LS, Calderón-Colón X. Theranostic biocomposite scaffold membrane. Biomaterials 2019; 212:17-27. [PMID: 31100480 DOI: 10.1016/j.biomaterials.2019.05.007] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2018] [Revised: 04/13/2019] [Accepted: 05/05/2019] [Indexed: 12/15/2022]
Abstract
Acute and chronic wounds affect millions and are associated with billions of dollars in healthcare costs. The use of healing markers, biochemical cues from biocompatible matrices and materials, and their correlation with wound healing has the potential to generate valuable diagnostic, prognostic, and therapeutic information. In this study, we developed a collagen-dextran oxygen-sensing biocomposite scaffold membrane in which a phosphorescent oxygen sensor was incorporated to monitor physiological oxygen using in vivo phosphorescence imaging in a preclinical mouse model of wound healing. The oxygen-sensing biocomposite scaffold membrane enabled the noninvasive and longitudinal monitoring of oxygenation changes in vivo in an approach compatible with commercially available preclinical in vivo imaging system instruments. This study provides a new and novel capability where a biocomposite material can serve as a biocompatible, biodegradable theranostic platform to promote and assess tissue oxygenation during wound healing.
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Affiliation(s)
- Emmanuel Roussakis
- (a)Wellman Center for Photomedicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA, 02129, USA
| | - Roger V Ortines
- Department of Dermatology, Johns Hopkins University School of Medicine, Baltimore, MD, 21231, USA
| | - Bret L Pinsker
- Department of Dermatology, Johns Hopkins University School of Medicine, Baltimore, MD, 21231, USA
| | - Cavin T Mooers
- Research and Exploratory Development Department, The Johns Hopkins University - Applied Physics Laboratory, Laurel, MD, 20723, USA
| | - Conor L Evans
- (a)Wellman Center for Photomedicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA, 02129, USA
| | - Lloyd S Miller
- Department of Dermatology, Johns Hopkins University School of Medicine, Baltimore, MD, 21231, USA
| | - Xiomara Calderón-Colón
- Research and Exploratory Development Department, The Johns Hopkins University - Applied Physics Laboratory, Laurel, MD, 20723, USA.
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18
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Polacco MA, Hou H, Kuppusamy P, Chen EY. Measuring Flap Oxygen Using Electron Paramagnetic Resonance Oximetry. Laryngoscope 2019; 129:E415-E419. [PMID: 31034638 DOI: 10.1002/lary.28043] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Revised: 04/03/2019] [Accepted: 04/15/2019] [Indexed: 12/18/2022]
Abstract
OBJECTIVES/HYPOTHESIS To determine if electron paramagnetic resonance (EPR) oximetry is a viable technology to aid in flap monitoring. STUDY DESIGN Prospective cohort. METHODS This was a cohort study assessing accuracy and speed of EPR oximetry in detecting ischemia of a saphenous artery-based flap in a rat model, using transcutaneous oximetry as a control. Measurements were obtained under both resting and ischemic conditions for nine Sprague Dawley rats (18 flaps), for 3 postoperative days following flap elevation. RESULTS The mean partial pressure of oxygen prior to tourniquet application was 66.9 ± 8.9 mm Hg with EPR oximetry and 64.7 ± 5.2 mm Hg with transcutaneous oximetry (P = .45). Mean partial pressures of oxygen during tourniquet application were 8.9 ± 3.2 mm Hg and 8.5 ± 2.9 mm Hg for EPR oximetry and transcutaneous oximetry, respectively (P = .48), and 67.2 ± 6.9 mm Hg and 65.3 ± 6.1 mm Hg after tourniquet release for EPR oximetry and transcutaneous oximetry, respectively (P = .44). The mean ischemia detection time of EPR oximetry was 49 ± 21 seconds. CONCLUSIONS Offering timely, accurate, and noninvasive tissue oxygen measurements, EPR oximetry is a promising adjunct in flap monitoring. LEVEL OF EVIDENCE NA Laryngoscope, 129:E415-E419, 2019.
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Affiliation(s)
- Marc A Polacco
- Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire
| | - Huagang Hou
- Brigham and Women's Hospital, Boston, Massachusetts
| | | | - Eunice Y Chen
- Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire
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19
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Zhou F, Wang W, Guo H. Silver triethanolamine-loaded PVB/CO films for a potential liquid bandage application. J Biomater Appl 2019; 33:1434-1443. [DOI: 10.1177/0885328219835361] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Many studies have reported that silver has excellent antibacterial properties. However, silver ions can easily react with oxygen to form Ag2O, thus leading to a color change and a reduction in its anti-microbial characteristics. In this study, silver triethanolamine- (ST) loaded PVB/CO solution was prepared as a potential candidate liquid bandage. PVB/CO/ST retained high transparency after exposure to light for 12 months, which allowed convenient inspection of the wound bed without removal of the dressing. The PVB/CO/ST film exhibited favorable properties, such as speed of drying, excellent tensile strength and elongation characteristics and water vapor transmission rate (WVTR). It was comfortable and waterproof, and therefore effective at preventing bacterial invasion, providing effective biosafety. PVB/CO/ST solution-treated wounds exhibited accelerated healing and reduced inflammation in a nude mouse mode. Our data suggested that PVB/CO/ST solution could serve as a promising liquid bandage for treatment of minor trauma.
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Affiliation(s)
- Fengzhen Zhou
- Department of Pharmaceutical Engineering, School of Bioengineering and Food, Key Laboratory of Fermentation Engineering (Ministry of Education), Key Laboratory of industrial microbiology in Hubei, Hubei University of Technology, Wuhan, China
| | - Wenjing Wang
- Department of Pharmaceutical Engineering, School of Bioengineering and Food, Key Laboratory of Fermentation Engineering (Ministry of Education), Key Laboratory of industrial microbiology in Hubei, Hubei University of Technology, Wuhan, China
| | - Huiling Guo
- Department of Pharmaceutical Engineering, School of Bioengineering and Food, Key Laboratory of Fermentation Engineering (Ministry of Education), Key Laboratory of industrial microbiology in Hubei, Hubei University of Technology, Wuhan, China
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20
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Li Z, Marks H, Evans CL, Apiou-Sbirlea G. Sensing, monitoring, and release of therapeutics: the translational journey of next generation bandages. JOURNAL OF BIOMEDICAL OPTICS 2018; 24:1-9. [PMID: 30592189 PMCID: PMC6987519 DOI: 10.1117/1.jbo.24.2.021201] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/14/2018] [Accepted: 11/14/2018] [Indexed: 06/09/2023]
Abstract
This article aims to be a progress report on the Sensing, Monitoring And Release of Therapeutics (SMART) bandage-one of the three technologies that received the inaugural SPIE Photonics West Translational Research Symposium Award in 2015. Invented and developed by Dr. Conor L. Evans and his research team at the Wellman Center for Photomedicine, Massachusetts General Hospital, the SMART bandage is a tool aiming to provide measurements of physiological parameters in the skin alongside the administration of therapeutics on-demand. Since the project began in 2012, the chemists, physicists, and biomedical engineers in the team have worked closely with partners from academia and industry to develop oxygen-sensing SMART bandage prototypes that are now in first-in-human clinical studies. This report gives perspectives on the genesis and translational journey of the technology with an emphasis on the challenges encountered, and the solutions innovated at each stage of development.
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Affiliation(s)
- Zongxi Li
- Mass General Research Institute, Boston, Massachusetts, United States
| | - Haley Marks
- Massachusetts General Hospital, Harvard Medical School, Wellman Center for Photomedicine, Charlestown, Massachusetts, United States
| | - Conor L. Evans
- Massachusetts General Hospital, Harvard Medical School, Wellman Center for Photomedicine, Charlestown, Massachusetts, United States
| | - Gabriela Apiou-Sbirlea
- Mass General Research Institute, Boston, Massachusetts, United States
- Massachusetts General Hospital, Harvard Medical School, Wellman Center for Photomedicine, Charlestown, Massachusetts, United States
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21
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Pal A, Goswami D, Cuellar HE, Castro B, Kuang S, Martinez RV. Early detection and monitoring of chronic wounds using low-cost, omniphobic paper-based smart bandages. Biosens Bioelectron 2018; 117:696-705. [DOI: 10.1016/j.bios.2018.06.060] [Citation(s) in RCA: 82] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2018] [Revised: 06/06/2018] [Accepted: 06/27/2018] [Indexed: 12/18/2022]
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22
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Kmiec MM, Hou H, Lakshmi Kuppusamy M, Drews TM, Prabhat AM, Petryakov SV, Demidenko E, Schaner PE, Buckey JC, Blank A, Kuppusamy P. Transcutaneous oxygen measurement in humans using a paramagnetic skin adhesive film. Magn Reson Med 2018; 81:781-794. [PMID: 30277275 DOI: 10.1002/mrm.27445] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Revised: 06/11/2018] [Accepted: 06/11/2018] [Indexed: 01/20/2023]
Abstract
PURPOSE Transcutaneous oxygen tension (TcpO2 ) provides information about blood perfusion in the tissue immediately below the skin. These data are valuable in assessing wound healing problems, diagnosing peripheral vascular/arterial insufficiency, and predicting disease progression or the response to therapy. Currently, TcpO2 is primarily measured using electrochemical skin sensors, which consume oxygen and are prone to calibration errors. The goal of the present study was to develop a reliable method for TcpO2 measurement in human subjects. METHODS We have developed a novel TcpO2 oximetry method based on electron paramagnetic resonance (EPR) principles with an oxygen-sensing skin adhesive film, named the superficial perfusion oxygen tension (SPOT) chip. The SPOT chip is a 3-mm diameter, 60-μm thick circular film composed of a stable paramagnetic oxygen sensor. The chip is covered with an oxygen-barrier material on one side and secured on the skin by a medical adhesive transfer tape to ensure that only the oxygen that diffuses through the skin surface is measured. The method quantifies TcpO2 through the linewidth of the EPR spectrum. RESULTS Repeated measurements using a cohort of 10 healthy human subjects showed that the TcpO2 measurements were robust, reliable, and reproducible. The TcpO2 values ranged from 7.8 ± 0.8 to 22.0 ± 1.0 mmHg in the volar forearm skin (N = 29) and 8.1 ± 0.3 to 23.4 ± 1.3 mmHg in the foot (N = 86). CONCLUSIONS The results demonstrated that the SPOT chip can measure TcpO2 reliably and repeatedly under ambient conditions. The SPOT chip method could potentially be used to monitor TcpO2 in the clinic.
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Affiliation(s)
- Maciej M Kmiec
- Department of Radiology, Geisel School of Medicine, Dartmouth College, Lebanon, New Hampshire
| | - Huagang Hou
- Department of Radiology, Geisel School of Medicine, Dartmouth College, Lebanon, New Hampshire
| | - M Lakshmi Kuppusamy
- Department of Radiology, Geisel School of Medicine, Dartmouth College, Lebanon, New Hampshire
| | - Thomas M Drews
- Department of Chemistry, University of Massachusetts, Amherst, Massachusetts
| | - Anjali M Prabhat
- Department of Radiology, Geisel School of Medicine, Dartmouth College, Lebanon, New Hampshire
| | - Sergey V Petryakov
- Department of Radiology, Geisel School of Medicine, Dartmouth College, Lebanon, New Hampshire
| | - Eugene Demidenko
- Department of Biomedical Data Sciences, Geisel School of Medicine, Dartmouth College, Lebanon, New Hampshire
| | - Philip E Schaner
- Department of Medicine, Geisel School of Medicine, Dartmouth College, Lebanon, New Hampshire
| | - Jay C Buckey
- Department of Medicine, Geisel School of Medicine, Dartmouth College, Lebanon, New Hampshire
| | - Aharon Blank
- Schulich Faculty of Chemistry Technion, Israel Institute of Technology, Haifa, Israel
| | - Periannan Kuppusamy
- Department of Radiology, Geisel School of Medicine, Dartmouth College, Lebanon, New Hampshire.,Department of Chemistry, University of Massachusetts, Amherst, Massachusetts
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23
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Derakhshandeh H, Kashaf SS, Aghabaglou F, Ghanavati IO, Tamayol A. Smart Bandages: The Future of Wound Care. Trends Biotechnol 2018; 36:1259-1274. [PMID: 30197225 DOI: 10.1016/j.tibtech.2018.07.007] [Citation(s) in RCA: 119] [Impact Index Per Article: 19.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2018] [Revised: 07/04/2018] [Accepted: 07/10/2018] [Indexed: 01/16/2023]
Abstract
Chronic non-healing wounds are major healthcare challenges that affect a noticeable number of people; they exert a severe financial burden and are the leading cause of limb amputation. Although chronic wounds are locked in a persisting inflamed state, they are dynamic and proper therapy requires identifying abnormalities, administering proper drugs and growth factors, and modulating the conditions of the environment. In this review article, we discuss technologies that have been developed to actively monitor the wound environment. We also highlight drug delivery tools that have been integrated with bandages to facilitate precise temporal and spatial control over drug release and review automated or semi-automated systems that can respond to the wound environment.
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Affiliation(s)
- Hossein Derakhshandeh
- Department of Mechanical and Materials Engineering, University of Nebraska, Lincoln, NE 68508, USA
| | - Sara Saheb Kashaf
- The University of Chicago Medical Scientist Training Program, Pritzker School of Medicine, University of Chicago, Chicago, IL 60637, USA
| | - Fariba Aghabaglou
- Department of Mechanical and Materials Engineering, University of Nebraska, Lincoln, NE 68508, USA
| | - Ian O Ghanavati
- Department of Mechanical and Materials Engineering, University of Nebraska, Lincoln, NE 68508, USA
| | - Ali Tamayol
- Department of Mechanical and Materials Engineering, University of Nebraska, Lincoln, NE 68508, USA; Current address: 900 N16th Street, Room NH W332, Lincoln, NE 68508, USA.
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Papkovsky DB, Dmitriev RI. Imaging of oxygen and hypoxia in cell and tissue samples. Cell Mol Life Sci 2018; 75:2963-2980. [PMID: 29761206 PMCID: PMC11105559 DOI: 10.1007/s00018-018-2840-x] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2018] [Revised: 04/24/2018] [Accepted: 05/07/2018] [Indexed: 01/17/2023]
Abstract
Molecular oxygen (O2) is a key player in cell mitochondrial function, redox balance and oxidative stress, normal tissue function and many common disease states. Various chemical, physical and biological methods have been proposed for measurement, real-time monitoring and imaging of O2 concentration, state of decreased O2 (hypoxia) and related parameters in cells and tissue. Here, we review the established and emerging optical microscopy techniques allowing to visualize O2 levels in cells and tissue samples, mostly under in vitro and ex vivo, but also under in vivo settings. Particular examples include fluorescent hypoxia stains, fluorescent protein reporter systems, phosphorescent probes and nanosensors of different types. These techniques allow high-resolution mapping of O2 gradients in live or post-mortem tissue, in 2D or 3D, qualitatively or quantitatively. They enable control and monitoring of oxygenation conditions and their correlation with other biomarkers of cell and tissue function. Comparison of these techniques and corresponding imaging setups, their analytical capabilities and typical applications are given.
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Affiliation(s)
- Dmitri B Papkovsky
- School of Biochemistry and Cell Biology, University College Cork, Cavanagh Pharmacy Building, College Road, Cork, Ireland.
| | - Ruslan I Dmitriev
- School of Biochemistry and Cell Biology, University College Cork, Cavanagh Pharmacy Building, College Road, Cork, Ireland.
- Institute for Regenerative Medicine, Sechenov University, Moscow, Russian Federation.
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25
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Li Z, Navarro-Alvarez N, Keeley EJ, Nowell NH, Goncalves BMM, Huang CA, Evans CL. Non-invasive monitoring of skin inflammation using an oxygen-sensing paint-on bandage. BIOMEDICAL OPTICS EXPRESS 2017; 8:4640-4651. [PMID: 29082091 PMCID: PMC5654806 DOI: 10.1364/boe.8.004640] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2017] [Revised: 09/11/2017] [Accepted: 09/19/2017] [Indexed: 05/19/2023]
Abstract
Inflammation involves a cascade of cellular and molecular mediators that ultimately lead to the infiltration of immune cells into the affected area. This inflammatory process in skin is common to many diseases including acne, infection, and psoriasis, with the presence or absence of immune cells a potential diagnostic marker. Here we show that skin inflammation can be non-invasively measured and mapped using a paint-on oxygen sensing bandage in an in vivo porcine inflammation model. After injection of a known inflammatory agent, the bandage could track the increase, plateau, and decrease in oxygen consumption at the injury site over 7 weeks, as well as discern inflammation resultant from injection at various depths beneath the surface of the skin. Both the initial rate of pO2 change and the change in bandage pO2 at equilibration (CBP20) were found to be directly related to the metabolic oxygen consumption rate of the tissue in contact. Healthy skin demonstrated an initial pO2 decrease rate of 6.5 [Formula: see text], and CBP20 of 84 [Formula: see text]. Inflamed skin had a significantly higher initial consumption rate of 55 [Formula: see text], and a larger CBP20 of 140 [Formula: see text]. The change in the bandage pO2 before and after equilibration with tissue was found to correlate well with histological evidence of skin inflammation in the animals.
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Affiliation(s)
- Zongxi Li
- Wellman Center for Photomedicine, Harvard Medical School, Massachusetts General Hospital, 149 13th Street, Charlestown, Massachusetts 02129, USA
| | - Nalu Navarro-Alvarez
- Center for Transplantation Sciences, Massachusetts General Hospital, 149 13th Street, Charlestown, Massachusetts 02129, USA
| | - Emily J. Keeley
- Wellman Center for Photomedicine, Harvard Medical School, Massachusetts General Hospital, 149 13th Street, Charlestown, Massachusetts 02129, USA
- Department of Biological Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA
| | - Nicholas H. Nowell
- Wellman Center for Photomedicine, Harvard Medical School, Massachusetts General Hospital, 149 13th Street, Charlestown, Massachusetts 02129, USA
| | - Beatriz M. M. Goncalves
- Center for Transplantation Sciences, Massachusetts General Hospital, 149 13th Street, Charlestown, Massachusetts 02129, USA
| | - Christene A. Huang
- Center for Transplantation Sciences, Massachusetts General Hospital, 149 13th Street, Charlestown, Massachusetts 02129, USA
| | - Conor L. Evans
- Wellman Center for Photomedicine, Harvard Medical School, Massachusetts General Hospital, 149 13th Street, Charlestown, Massachusetts 02129, USA
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26
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Zarrintaj P, Moghaddam AS, Manouchehri S, Atoufi Z, Amiri A, Amirkhani MA, Nilforoushzadeh MA, Saeb MR, Hamblin MR, Mozafari M. Can regenerative medicine and nanotechnology combine to heal wounds? The search for the ideal wound dressing. Nanomedicine (Lond) 2017; 12:2403-2422. [DOI: 10.2217/nnm-2017-0173] [Citation(s) in RCA: 135] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Skin is the outermost covering of the human body and at the same time the largest organ comprising 15% of body weight and 2 m2 surface area. Skin plays a key role as a barrier against the outer environment depending on its thickness, color and structure, which differ from one site to another. The four major types of problematic wounds include ulcers (diabetic, venous, pressure) and burn wounds. Developing novel dressings helps us to improve the wound healing process in difficult patients. Recent advances in regenerative medicine and nanotechnology are revolutionizing the field of wound healing. Antimicrobial activity, exogenous cell therapy, growth factor delivery, biodegradable and biocompatible matrix construction, all play a role in hi-tech dressing design. In the present review, we discuss how the principles of regenerative medicine and nanotechnology can be combined in innovative wound dressings.
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Affiliation(s)
- Payam Zarrintaj
- School of Chemical Engineering, College of Engineering, University of Tehran, Tehran, Iran
| | | | - Saeed Manouchehri
- School of Chemical Engineering, College of Engineering, University of Tehran, Tehran, Iran
| | - Zhaleh Atoufi
- School of Chemical Engineering, College of Engineering, University of Tehran, Tehran, Iran
| | - Anahita Amiri
- School of Chemical Engineering, College of Engineering, University of Tehran, Tehran, Iran
| | | | | | - Mohammad Reza Saeb
- Department of Resin & Additives, Institute for Color Science & Technology, P.O. Box 16765–654, Tehran, Iran
| | - Michael R Hamblin
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA 02114, USA
- Department of Dermatology, Harvard Medical School, Boston, MA 02115, USA
- Harvard-MIT Division of Health Sciences & Technology, Cambridge, MA 02139, USA
| | - Masoud Mozafari
- Nanotechnology & Advanced Materials Department, Materials & Energy Research Center (MERC), Tehran, Iran
- Cellular & Molecular Research Center, Iran University of Medical Sciences, Tehran, Iran
- Department of Tissue Engineering & Regenerative Medicine, Faculty of Advanced Technologies in Medicine, Iran University of Medical Sciences, Tehran, Iran
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27
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Oxygen-Sensing Paint-On Bandage: Calibration of a Novel Approach in Tissue Perfusion Assessment. Plast Reconstr Surg 2017; 140:89-96. [PMID: 28654595 DOI: 10.1097/prs.0000000000003421] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
BACKGROUND Knowledge of tissue oxygenation status is fundamental in the prevention of postoperative flap failure. Recently, the authors introduced a novel oxygen-sensing paint-on bandage that incorporated an oxygen-sensing porphyrin with a commercially available liquid bandage matrix. In this study, the authors extend validation of their oxygen-sensing bandage by comparing it to the use of near-infrared tissue oximetry in addition to Clark electrode measurements. METHODS The oxygen-sensing paint-on bandage was applied to the left hind limb in a rodent model. Simultaneously, a near-infrared imaging device and Clark electrode were attached to the right and left hind limbs, respectively. Tissue oxygenation was measured under normal, ischemic (aortic ligation), and reperfused conditions. RESULTS On average, the oxygen-sensing paint-on bandage measured a decrease in transdermal oxygenation from 85.2 mmHg to 64.1 mmHg upon aortic ligation. The oxygen-sensing dye restored at 81.2 mmHg after unclamping. Responses in both control groups demonstrated a similar trend. Physiologic changes from normal to ischemic and reperfused conditions were statistically significantly different in all three techniques (p < 0.001). CONCLUSIONS The authors' newly developed oxygen-sensing paint-on bandage exhibits a comparable trend in oxygenation recordings in a rat model similar to conventional oxygenation assessment techniques. This technique could potentially prove to be a valuable tool in the routine clinical management of flaps following free tissue transfer. Incorporating oxygen-sensing capabilities into a simple wound dressing material has the added benefit of providing both wound protection and constant wound oxygenation assessment.
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Tsytsarev V, Akkentli F, Pumbo E, Tang Q, Chen Y, Erzurumlu RS, Papkovsky DB. Planar implantable sensor for in vivo measurement of cellular oxygen metabolism in brain tissue. J Neurosci Methods 2017; 281:1-6. [PMID: 28219725 DOI: 10.1016/j.jneumeth.2017.02.005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2016] [Revised: 01/13/2017] [Accepted: 02/15/2017] [Indexed: 10/20/2022]
Abstract
BACKGROUND Brain imaging methods are continually improving. Imaging of the cerebral cortex is widely used in both animal experiments and charting human brain function in health and disease. Among the animal models, the rodent cerebral cortex has been widely used because of patterned neural representation of the whiskers on the snout and relative ease of activating cortical tissue with whisker stimulation. NEW METHOD We tested a new planar solid-state oxygen sensor comprising a polymeric film with a phosphorescent oxygen-sensitive coating on the working side, to monitor dynamics of oxygen metabolism in the cerebral cortex following sensory stimulation. RESULTS Sensory stimulation led to changes in oxygenation and deoxygenation processes of activated areas in the barrel cortex. We demonstrate the possibility of dynamic mapping of relative changes in oxygenation in live mouse brain tissue with such a sensor. COMPARISON WITH EXISTING METHOD Oxygenation-based functional magnetic resonance imaging (fMRI) is very effective method for functional brain mapping but have high costs and limited spatial resolution. Optical imaging of intrinsic signal (IOS) does not provide the required sensitivity, and voltage-sensitive dye optical imaging (VSDi) has limited applicability due to significant toxicity of the voltage-sensitive dye. Our planar solid-state oxygen sensor imaging approach circumvents these limitations, providing a simple optical contrast agent with low toxicity and rapid application. CONCLUSIONS The planar solid-state oxygen sensor described here can be used as a tool in visualization and real-time analysis of sensory-evoked neural activity in vivo. Further, this approach allows visualization of local neural activity with high temporal and spatial resolution.
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Affiliation(s)
- Vassiliy Tsytsarev
- Department of Anatomy and Neurobiology, University of Maryland School of Medicine, 20 Penn Street, HSF-2, 21201 MD, Baltimore, USA.
| | - Fatih Akkentli
- Department of Anatomy and Neurobiology, University of Maryland School of Medicine, 20 Penn Street, HSF-2, 21201 MD, Baltimore, USA.
| | - Elena Pumbo
- Center for Genetic Medicine, Children's National Medical Center, Washington DC, 111 Michigan Avenue, NW Washington, DC 20010, USA.
| | - Qinggong Tang
- Fischell Department of Bioengineering, University of Maryland, College Park, Kim Engineering Building, College Park, MD 20740, USA.
| | - Yu Chen
- Fischell Department of Bioengineering, University of Maryland, College Park, Kim Engineering Building, College Park, MD 20740, USA.
| | - Reha S Erzurumlu
- Department of Anatomy and Neurobiology, University of Maryland School of Medicine, 20 Penn Street, HSF-2, 21201 MD, Baltimore, USA.
| | - Dmitri B Papkovsky
- School of Biochemistry and Cell Biology, University College Cork, Cavanagh Pharmacy Building 1.28, College Road, Cork, Ireland.
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29
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DeRosa CA, Seaman SA, Mathew AS, Gorick CM, Fan Z, Demas JN, Peirce SM, Fraser CL. Oxygen Sensing Difluoroboron β-Diketonate Polylactide Materials with Tunable Dynamic Ranges for Wound Imaging. ACS Sens 2016; 1:1366-1373. [PMID: 28042606 DOI: 10.1021/acssensors.6b00533] [Citation(s) in RCA: 90] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Difluoroboron β-diketonate poly(lactic acid) materials exhibit both fluorescence (F) and oxygen sensitive room-temperature phosphorescence (RTP). Introduction of halide heavy atoms (Br and I) is an effective strategy to control the oxygen sensitivity in these materials. A series of naphthyl-phenyl (nbm) dye derivatives with hydrogen, bromide and iodide substituents were prepared for comparison. As nanoparticles, the hydrogen derivative was hypersensitive to oxygen (0-0.3%), while the bromide analogue was suited for hypoxia detection (0-3% O2). The iodo derivative, BF2nbm(I)PLA, showed excellent F to RTP peak separation and an 0-100% oxygen sensitivity range unprecedented for metal-free RTP emitting materials. Due to the dual emission and unconventionally long RTP lifetimes of these O2 sensing materials, a portable, cost-effective camera was used to quantify oxygen levels via lifetime and red/green/blue (RGB) ratiometry. The hypersensitive H dye was well matched to lifetime detection, simultaneous lifetime and ratiometric imaging was possible for the bromide analogue, whereas the iodide material, with intense RTP emission and a shorter lifetime, was suited for RGB ratiometry. To demonstrate the prospects of this camera/material design combination for bioimaging, iodide boron dye-PLA nanoparticles were applied to a murine wound model to detect oxygen levels. Surprisingly, wound oxygen imaging was achieved without covering (i.e. without isolating from ambient conditions, air). Additionally, would healing was monitored via wound size reduction and associated oxygen recovery, from hypoxic to normoxic. These single-component materials provide a simple tunable platform for biological oxygen sensing that can be deployed to spatially resolve oxygen in a variety of environments.
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Affiliation(s)
- Christopher A. DeRosa
- Department
of Chemistry, University of Virginia, Charlottesville, Virginia 22904, United States
| | - Scott A. Seaman
- Department
of Biomedical Engineering, University of Virginia, Charlottesville, Virginia 22908, United States
| | - Alexander S. Mathew
- Department
of Chemistry, University of Virginia, Charlottesville, Virginia 22904, United States
| | - Catherine M. Gorick
- Department
of Biomedical Engineering, University of Virginia, Charlottesville, Virginia 22908, United States
| | - Ziyi Fan
- Department
of Chemistry, University of Virginia, Charlottesville, Virginia 22904, United States
| | - James N. Demas
- Department
of Chemistry, University of Virginia, Charlottesville, Virginia 22904, United States
| | - Shayn M. Peirce
- Department
of Biomedical Engineering, University of Virginia, Charlottesville, Virginia 22908, United States
| | - Cassandra L. Fraser
- Department
of Chemistry, University of Virginia, Charlottesville, Virginia 22904, United States
- Department
of Biomedical Engineering, University of Virginia, Charlottesville, Virginia 22908, United States
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30
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Petrášek Z, Bolivar JM, Nidetzky B. Confocal Luminescence Lifetime Imaging with Variable Scan Velocity and Its Application to Oxygen Sensing. Anal Chem 2016; 88:10736-10743. [PMID: 27690248 DOI: 10.1021/acs.analchem.6b03363] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The dependence of the luminescence lifetime on the probe environment is the basis of a range of sensing techniques. The major advantage of using the lifetime as the sensitive parameter is its independence on the probe concentration. However, the instrumentation for lifetime measurements is complex, generally requiring time-resolved excitation and detection. Here, we present a simple method for the measurement of luminescence lifetimes on the microsecond scale based on variable excitation time determined by the scanning velocity. The technique is implemented in a confocal laser scanning microscope (CLSM), thus allowing not only simple lifetime measurement but also phosphorescence lifetime imaging. Since the method exploits the spatiotemporal dependence of sample excitation in a CLSM, there is no need for a pulsed or modulated light source or for additional time-resolved detection. The method can be realized in a standard CLSM without any modifications. The principle is demonstrated on oxygen sensing by collisional quenching of an oxygen-sensitive ruthenium(II) complex.
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Affiliation(s)
- Zdeněk Petrášek
- Institute of Biotechnology and Biochemical Engineering, Graz University of Technology, NAWI Graz , Petersgasse 12, A-8010 Graz, Austria
| | - Juan M Bolivar
- Institute of Biotechnology and Biochemical Engineering, Graz University of Technology, NAWI Graz , Petersgasse 12, A-8010 Graz, Austria
| | - Bernd Nidetzky
- Institute of Biotechnology and Biochemical Engineering, Graz University of Technology, NAWI Graz , Petersgasse 12, A-8010 Graz, Austria.,Austrian Centre of Industrial Biotechnology , Petersgasse 14, A-8010 Graz, Austria
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31
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Farooqui MF, Shamim A. Low Cost Inkjet Printed Smart Bandage for Wireless Monitoring of Chronic Wounds. Sci Rep 2016; 6:28949. [PMID: 27353200 PMCID: PMC4926082 DOI: 10.1038/srep28949] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2015] [Accepted: 06/07/2016] [Indexed: 11/26/2022] Open
Abstract
Chronic wounds affect millions of patients around the world and their treatment is challenging as the early signs indicating their development are subtle. In addition, a type of chronic wound, known as pressure ulcer, develops in patients with limited mobility. Infection and frequent bleeding are indicators of chronic wound development. In this article, we present an unprecedented low cost continuous wireless monitoring system, realized through inkjet printing on a standard bandage, which can send early warnings for the parameters like irregular bleeding, variations in pH levels and external pressure at wound site. In addition to the early warnings, this smart bandage concept can provide long term wound progression data to the health care providers. The smart bandage comprises a disposable part which has the inkjet printed sensors and a reusable part constituting the wireless electronics. This work is an important step towards futuristic wearable sensors for remote health care applications.
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Affiliation(s)
- Muhammad Fahad Farooqui
- Electrical Engineering Program, 4700 King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Atif Shamim
- Electrical Engineering Program, 4700 King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
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32
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Mathew AS, DeRosa CA, Demas JN, Fraser CL. Difluoroboron β-Diketonate Materials with Long-Lived Phosphorescence Enable Lifetime Based Oxygen Imaging with a Portable Cost Effective Camera. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2016; 8:3109-3114. [PMID: 27909462 PMCID: PMC5125782 DOI: 10.1039/c5ay02959g] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Lifetime-based oxygen imaging is useful in many biological applications but instrumentation can be stationary, expensive, and complex. Herein, we present a portable, cost effective, simple alternative with high spatiotemporal resolution that uses a complementary metal oxide silicon (CMOS) camera to measure oxygen sensitive lifetimes on the millisecond scale. We demonstrate its compatibility with difluoroboron β-diketonate poly(lactic acid) (BF2bdkPLA) polymers which are nontoxic and exhibit long-lived oxygen sensitive phosphorescence. Spatially resolved lifetimes of four BF2bdkPLA variants are measured using nonlinear least squares (NLS) and rapid lifetime determination (RLD) both of which are shown to be accurate and precise. Real-time imaging in a dynamic environment is demonstrated by determining lifetime pixel-wise. The setup costs less than $5000, easily fits into a backpack, and can operate on battery power alone. This versatility combined with the inherent utility of lifetime measurements make this system a useful tool for a wide variety of oxygen sensing applications. This study serves as an important foundation for the development of dual mode real time lifetime plus ratiometric imaging with bright, long lifetime difluoroboron β-diketonate probes.
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33
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Horgan CC, Han YS, Trueman H, Jackson CJ, Sutherland TD, Rapson TD. Phosphorescent oxygen-sensing and singlet oxygen production by a biosynthetic silk. RSC Adv 2016. [DOI: 10.1039/c6ra03731c] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A recombinant coiled-coil silk was utilised to immobilise heavy-metal-macrocycles which are known to undergo efficient intersystem crossing from the singlet state to the triplet state following excitation with visible light.
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Affiliation(s)
- Conor C. Horgan
- Research School of Engineering
- The Australian National University
- Acton
- Australia
- CSIRO
| | - Yong-Shen Han
- Research School of Chemistry
- The Australian National University
- Acton
- Australia
| | | | - Colin J. Jackson
- Research School of Chemistry
- The Australian National University
- Acton
- Australia
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34
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Desmet CM, Lafosse A, Vériter S, Porporato PE, Sonveaux P, Dufrane D, Levêque P, Gallez B. Application of Electron Paramagnetic Resonance (EPR) Oximetry to Monitor Oxygen in Wounds in Diabetic Models. PLoS One 2015; 10:e0144914. [PMID: 26659378 PMCID: PMC4679295 DOI: 10.1371/journal.pone.0144914] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2015] [Accepted: 11/26/2015] [Indexed: 11/18/2022] Open
Abstract
A lack of oxygen is classically described as a major cause of impaired wound healing in diabetic patients. Even if the role of oxygen in the wound healing process is well recognized, measurement of oxygen levels in a wound remains challenging. The purpose of the present study was to assess the value of electron paramagnetic resonance (EPR) oximetry to monitor pO2 in wounds during the healing process in diabetic mouse models. Kinetics of wound closure were carried out in streptozotocin (STZ)-treated and db/db mice. The pO2 was followed repeatedly during the healing process by 1 GHz EPR spectroscopy with lithium phthalocyanine (LiPc) crystals used as oxygen sensor in two different wound models: a full-thickness excisional skin wound and a pedicled skin flap. Wound closure kinetics were dramatically slower in 12-week-old db/db compared to control (db/+) mice, whereas kinetics were not statistically different in STZ-treated compared to control mice. At the center of excisional wounds, measurements were highly influenced by atmospheric oxygen early in the healing process. In pedicled flaps, hypoxia was observed early after wounding. While reoxygenation occurred over time in db/+ mice, hypoxia was prolonged in the diabetic db/db model. This observation was consistent with impaired healing and microangiopathies observed using intravital microscopy. In conclusion, EPR oximetry using LiPc crystals as the oxygen sensor is an appropriate technique to follow wound oxygenation in acute and chronic wounds, in normal and diabetic animals. Nevertheless, the technique is limited for measurements in pedicled skin flaps and cannot be applied to excisional wounds in which diffusion of atmospheric oxygen significantly affects the measurements.
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Affiliation(s)
- Céline M. Desmet
- Biomedical Magnetic Resonance Research Group, Louvain Drug Research Institute, Université catholique de Louvain, Brussels, Belgium
| | - Aurore Lafosse
- Endocrine Cell Therapy Unit, Center of Tissue/Cell Therapy, Institut de Recherche Expérimentale et Clinique, Cliniques Universitaires Saint-Luc, Université catholique de Louvain, Brussels, Belgium
- Plastic and Reconstructive Surgery Unit, Cliniques Universitaires Saint-Luc, Université catholique de Louvain, Brussels, Belgium
| | - Sophie Vériter
- Endocrine Cell Therapy Unit, Center of Tissue/Cell Therapy, Institut de Recherche Expérimentale et Clinique, Cliniques Universitaires Saint-Luc, Université catholique de Louvain, Brussels, Belgium
| | - Paolo E. Porporato
- Pole of Pharmacology, Institut de Recherche Expérimentale et Clinique, Université catholique de Louvain, Brussels, Belgium
| | - Pierre Sonveaux
- Pole of Pharmacology, Institut de Recherche Expérimentale et Clinique, Université catholique de Louvain, Brussels, Belgium
| | - Denis Dufrane
- Endocrine Cell Therapy Unit, Center of Tissue/Cell Therapy, Institut de Recherche Expérimentale et Clinique, Cliniques Universitaires Saint-Luc, Université catholique de Louvain, Brussels, Belgium
| | - Philippe Levêque
- Biomedical Magnetic Resonance Research Group, Louvain Drug Research Institute, Université catholique de Louvain, Brussels, Belgium
| | - Bernard Gallez
- Biomedical Magnetic Resonance Research Group, Louvain Drug Research Institute, Université catholique de Louvain, Brussels, Belgium
- * E-mail:
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35
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Roussakis E, Li Z, Nowell NH, Nichols AJ, Evans CL. Bright, "Clickable" Porphyrins for the Visualization of Oxygenation under Ambient Light. Angew Chem Int Ed Engl 2015; 54:14728-31. [PMID: 26510549 DOI: 10.1002/anie.201506847] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2015] [Indexed: 11/10/2022]
Abstract
A new group of "clickable" and brightly emissive metalloporphyrins has been developed for the visualization of oxygenation under ambient light with the naked eye. These alkynyl-terminated compounds permit the rapid and facile synthesis of oxygen-sensing dendrimers through azide-alkyne click chemistry. With absorption maxima overlapping with the wavelengths of common commercial laser sources, they are readily applicable to biomedical imaging of tissue oxygenation. An efficient synthetic methodology, featuring the stable trimethylacetyl (pivaloyl) protecting group, is described for their preparation. A paint-on liquid bandage containing a new, click-synthesized porphyrin dendrimer has been used to map oxygenation across an ex vivo porcine skin burn model.
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Affiliation(s)
- Emmanuel Roussakis
- Wellman Center for Photomedicine, Massachusetts General Hospital, CNY 149-3210, 13thStreet, Charlestown, MA 02129 (USA)
| | - Zongxi Li
- Wellman Center for Photomedicine, Massachusetts General Hospital, CNY 149-3210, 13thStreet, Charlestown, MA 02129 (USA)
| | - Nicholas H Nowell
- Wellman Center for Photomedicine, Massachusetts General Hospital, CNY 149-3210, 13thStreet, Charlestown, MA 02129 (USA)
| | - Alexander J Nichols
- Wellman Center for Photomedicine, Massachusetts General Hospital, CNY 149-3210, 13thStreet, Charlestown, MA 02129 (USA).,Harvard University Program in Biophysics, Building C2, Room 112, 240 Longwood Avenue, Boston, MA 02115 (USA).,Harvard-MIT Division of Health Sciences and Technology, 77 Massachusetts Avenue E25-519, Cambridge, MA 02139 (USA)
| | - Conor L Evans
- Wellman Center for Photomedicine, Massachusetts General Hospital, CNY 149-3210, 13thStreet, Charlestown, MA 02129 (USA). .,Harvard University Program in Biophysics, Building C2, Room 112, 240 Longwood Avenue, Boston, MA 02115 (USA).
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36
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Roussakis E, Li Z, Nowell NH, Nichols AJ, Evans CL. Bright, “Clickable” Porphyrins for the Visualization of Oxygenation under Ambient Light. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201506847] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Emmanuel Roussakis
- Wellman Center for Photomedicine, Massachusetts General Hospital, CNY 149‐3210, 13thStreet, Charlestown, MA 02129 (USA)
| | - Zongxi Li
- Wellman Center for Photomedicine, Massachusetts General Hospital, CNY 149‐3210, 13thStreet, Charlestown, MA 02129 (USA)
| | - Nicholas H. Nowell
- Wellman Center for Photomedicine, Massachusetts General Hospital, CNY 149‐3210, 13thStreet, Charlestown, MA 02129 (USA)
| | - Alexander J. Nichols
- Wellman Center for Photomedicine, Massachusetts General Hospital, CNY 149‐3210, 13thStreet, Charlestown, MA 02129 (USA)
- Harvard University Program in Biophysics, Building C2, Room 112, 240 Longwood Avenue, Boston, MA 02115 (USA)
- Harvard–MIT Division of Health Sciences and Technology, 77 Massachusetts Avenue E25‐519, Cambridge, MA 02139 (USA)
| | - Conor L. Evans
- Wellman Center for Photomedicine, Massachusetts General Hospital, CNY 149‐3210, 13thStreet, Charlestown, MA 02129 (USA)
- Harvard University Program in Biophysics, Building C2, Room 112, 240 Longwood Avenue, Boston, MA 02115 (USA)
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37
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Roussakis E, Li Z, Nichols AJ, Evans CL. Sauerstoffmessung in der Biomedizin - von der Makro- zur Mikroebene. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201410646] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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38
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Roussakis E, Li Z, Nichols AJ, Evans CL. Oxygen-Sensing Methods in Biomedicine from the Macroscale to the Microscale. Angew Chem Int Ed Engl 2015; 54:8340-62. [DOI: 10.1002/anie.201410646] [Citation(s) in RCA: 114] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2014] [Revised: 01/05/2015] [Indexed: 12/15/2022]
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