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Farr NTH, Workman VL, Saad S, Roman S, Hearnden V, Chapple CR, Murdoch C, Rodenburg C, MacNeil S. Uncovering the relationship between macrophages and polypropylene surgical mesh. BIOMATERIALS ADVANCES 2024; 159:213800. [PMID: 38377947 DOI: 10.1016/j.bioadv.2024.213800] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Revised: 02/06/2024] [Accepted: 02/11/2024] [Indexed: 02/22/2024]
Abstract
Currently, in vitro testing examines the cytotoxicity of biomaterials but fails to consider how materials respond to mechanical forces and the immune response to them; both are crucial for successful long-term implantation. A notable example of this failure is polypropylene mid-urethral mesh used in the treatment of stress urinary incontinence (SUI). The mesh was largely successful in abdominal hernia repair but produced significant complications when repurposed to treat SUI. Developing more physiologically relevant in vitro test models would allow more physiologically relevant data to be collected about how biomaterials will interact with the body. This study investigates the effects of mechanochemical distress (a combination of oxidation and mechanical distention) on polypropylene mesh surfaces and the effect this has on macrophage gene expression. Surface topology of the mesh was characterised using SEM and AFM; ATR-FTIR, EDX and Raman spectroscopy was applied to detect surface oxidation and structural molecular alterations. Uniaxial mechanical testing was performed to reveal any bulk mechanical changes. RT-qPCR of selected pro-fibrotic and pro-inflammatory genes was carried out on macrophages cultured on control and mechanochemically distressed PP mesh. Following exposure to mechanochemical distress the mesh surface was observed to crack and craze and helical defects were detected in the polymer backbone. Surface oxidation of the mesh was seen after macrophage attachment for 7 days. These changes in mesh surface triggered modified gene expression in macrophages. Pro-fibrotic and pro-inflammatory genes were upregulated after macrophages were cultured on mechanochemically distressed mesh, whereas the same genes were down-regulated in macrophages exposed to control mesh. This study highlights the relationship between macrophages and polypropylene surgical mesh, thus offering more insight into the fate of an implanted material than existing in vitro testing.
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Affiliation(s)
- Nicholas T H Farr
- Department of Materials Science and Engineering, University of Sheffield, Sir Robert Hadfield Building, Mappin Street, Sheffield, UK; Insigneo Institute for in silico Medicine, The Pam Liversidge Building, Sir Robert Hadfield Building, Mappin Street, Sheffield, UK.
| | - Victoria L Workman
- Department of Materials Science and Engineering, University of Sheffield, Sir Robert Hadfield Building, Mappin Street, Sheffield, UK; Insigneo Institute for in silico Medicine, The Pam Liversidge Building, Sir Robert Hadfield Building, Mappin Street, Sheffield, UK
| | - Sanad Saad
- Department of Materials Science and Engineering, University of Sheffield, Sir Robert Hadfield Building, Mappin Street, Sheffield, UK; Department of Urology, Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield, UK
| | - Sabiniano Roman
- Department of Materials Science and Engineering, University of Sheffield, Sir Robert Hadfield Building, Mappin Street, Sheffield, UK
| | - Vanessa Hearnden
- Department of Materials Science and Engineering, University of Sheffield, Sir Robert Hadfield Building, Mappin Street, Sheffield, UK; Insigneo Institute for in silico Medicine, The Pam Liversidge Building, Sir Robert Hadfield Building, Mappin Street, Sheffield, UK
| | | | - Craig Murdoch
- School of Clinical Dentistry, 19 Claremont Crescent, University of Sheffield, Sheffield, UK
| | - Cornelia Rodenburg
- Department of Materials Science and Engineering, University of Sheffield, Sir Robert Hadfield Building, Mappin Street, Sheffield, UK; Insigneo Institute for in silico Medicine, The Pam Liversidge Building, Sir Robert Hadfield Building, Mappin Street, Sheffield, UK
| | - Sheila MacNeil
- Department of Materials Science and Engineering, University of Sheffield, Sir Robert Hadfield Building, Mappin Street, Sheffield, UK
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Mallick K, Sahu A, Dubey NK, Das AP. Harvesting marine plastic pollutants-derived renewable energy: A comprehensive review on applied energy and sustainable approach. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 348:119371. [PMID: 37925980 DOI: 10.1016/j.jenvman.2023.119371] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2023] [Revised: 08/29/2023] [Accepted: 10/14/2023] [Indexed: 11/07/2023]
Abstract
The inevitable use of plastics in the existing standard of life makes its way to ecosystems, predominantly into the marine ecosystem. Recent research on energy recycling from marine discarded plastics through biological, chemical, and thermal processes is summarized, which degrade plastic debris and transform it into energy-efficient products. In a system-oriented approach, different boundaries like carbon efficiency, global warming potential, cumulative energy demand, and cost of the product have been evaluated. Even these technologies may successfully reduce the yearly volume of marine plastics by up to 89% while reducing greenhouse gas emissions by 30%. Conversely, recycling a ton of marine discarded plastics may save 915 cubic feet of landfill space, 6500 kWh of energy, and barrels of oil. Energy may be recovered up to 79% from waste plastics using various techniques. Up to 84% liquid fuel had been generated, with a maximum calorific power of 45 MJ/kg. It has been shown that in Asian countries, the power generation capacity of throw-away facemask wastes regularly varies from 2256 kWh/day to 18.52 million kWh/day. Hence, the conversion of marine plastics into biofuel, syngas, biochar, hydrocarbons, electricity, and value-added functional materials by various biotechnological and chemical processes like biodegradation, pyrolysis, gasification, methanolysis, and hydrolysis should be improvised as a source of alternative energy in the immediate future. Our review signifies the potential benefits of energy harvesting technologies from marine plastics pollutants to overcome the growing challenge of energy demands and provide a long-term solution to underdeveloped and developing countries as a sustainable source of energy. Endorsing current strategies to harvest energy from marine plastic wastes that enhance power generation technologies will help in building a more sustainable and greener environment that imparts a healthy and circular economy while shielding natural resources.
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Affiliation(s)
- Krishnamayee Mallick
- Department of Life Sciences, Rama Devi Women's University, Bhubaneswar, Odisha, India
| | - Aishwarya Sahu
- Department of Life Sciences, Rama Devi Women's University, Bhubaneswar, Odisha, India
| | | | - Alok Prasad Das
- Department of Life Sciences, Rama Devi Women's University, Bhubaneswar, Odisha, India.
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3
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Jain T, Tantisuwanno C, Paul A, Takmakov P, Joy A, Isayeva I, Simon DD. Accelerated in vitro oxidative degradation testing of polypropylene surgical mesh. J Biomed Mater Res B Appl Biomater 2023; 111:2064-2076. [PMID: 37596906 DOI: 10.1002/jbm.b.35308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2023] [Revised: 06/14/2023] [Accepted: 08/01/2023] [Indexed: 08/21/2023]
Abstract
Polypropylene (PP) surgical mesh had reasonable success in repair of hernia and treatment of stress urinary incontinence (SUI); however, their use for the repair of pelvic organ prolapse (POP) resulted in highly variable results with lifelong complications in some patients. One of several factors that could be associated with mesh-related POP complications is changes in the properties of the implanted surgical mesh due to oxidative degradation of PP in vivo. Currently, there are no standardized in vitro bench testing methods available for assessing the susceptibility to oxidative degradation and estimating long-term in vivo stability of surgical mesh. In this work, we adapted a previously reported automated reactive accelerated aging (aRAA) system, which uses elevated temperatures and high concentrations of hydrogen peroxide (H2 O2 ), for accelerated bench-top oxidative degradation testing of PP surgical mesh. Since H2 O2 is highly unstable at elevated temperatures and for prolonged periods, the aRAA system involves a feedback loop based on electrochemical detection methods to maintain consistent H2 O2 concentration in test solutions. Four PP mesh samples with varying mesh knit designs, filament diameter, weight, and % porosity, were selected for testing using aRAA up to 4 weeks and characterized using thermal analysis, Fourier-transform infrared spectroscopy-attenuated total reflectance (FTIR-ATR) and scanning electron microscopy (SEM). Additionally, the oxidation index (OI) values were calculated based on the FTIR-ATR spectra to estimate the oxidative degradation and oxidation reaction kinetics of PP surgical mesh. The OI values and surface damage in the form of surface flaking, peeling, and formation of transverse cracks increased with aRAA aging time. The aRAA test method introduced here could be used to standardize the assessment of long-term stability of surgical mesh and may also be adopted for accelerated oxidative degradation testing of other polymer-based medical devices.
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Affiliation(s)
- Tanmay Jain
- Division of Biology, Chemistry and Materials Science, U.S. Food and Drug Administration, Center for Devices and Radiological Health, Office of Science and Engineering Laboratories, Silver Spring, Maryland, USA
| | | | - Arindam Paul
- Division of Biology, Chemistry and Materials Science, U.S. Food and Drug Administration, Center for Devices and Radiological Health, Office of Science and Engineering Laboratories, Silver Spring, Maryland, USA
| | - Pavel Takmakov
- Division of Biology, Chemistry and Materials Science, U.S. Food and Drug Administration, Center for Devices and Radiological Health, Office of Science and Engineering Laboratories, Silver Spring, Maryland, USA
| | - Abraham Joy
- Department of Polymer Science, The University of Akron, Akron, Ohio, USA
| | - Irada Isayeva
- Division of Biology, Chemistry and Materials Science, U.S. Food and Drug Administration, Center for Devices and Radiological Health, Office of Science and Engineering Laboratories, Silver Spring, Maryland, USA
| | - David D Simon
- Division of Biology, Chemistry and Materials Science, U.S. Food and Drug Administration, Center for Devices and Radiological Health, Office of Science and Engineering Laboratories, Silver Spring, Maryland, USA
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Dibb B, Woodgate F, Taylor L. When things go wrong: experiences of vaginal mesh complications. Int Urogynecol J 2023; 34:1575-1581. [PMID: 36607398 PMCID: PMC10287809 DOI: 10.1007/s00192-022-05422-z] [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: 08/23/2022] [Accepted: 11/14/2022] [Indexed: 01/07/2023]
Abstract
INTRODUCTION Previous research has suggested that complications stemming from vaginal mesh can lead to life-changing negative physical consequences including erosion and chronic pain. However, there has been little research on the experiences of women who have had complications. This study was aimed at exploring the individual experiences of women who have had vaginal mesh complications and how this has impacted them. METHODS An explorative qualitative design was followed. Eighteen semi-structured interviews were conducted with women who had experienced complications with vaginal mesh due to stress urinary incontinence and pelvic organ prolapse. The mean age was 52 and the mean time since the mesh was fitted was 8 years (6 had since had it removed and a further 6 had had partial removal), and the mean time since first mesh-related symptom was 10 months. Data were analysed using thematic analysis. RESULTS Four main themes were identified: perceived impact of mesh complications, attitudes of medical professionals, social support and positive growth. Results showed that participant experiences of their mesh complication were psychologically traumatic, including feelings of increased anxiety and fears relating to suicidal thoughts. Intimate relationships were also affected, with reduced sexual functioning and intimacy stemming from mesh complications. Negative experiences with medical professionals included feeling dismissed, a lack of recognition of their symptoms, and anger towards the profession. CONCLUSIONS The impacts of vaginal mesh complications were found to be wide-reaching and life-changing, affecting numerous aspects of participants' lives. Greater awareness in this area is needed to provide further support for women experiencing vaginal mesh complications.
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Affiliation(s)
- Bridget Dibb
- School of Psychology, University of Surrey, Guildford, Surrey, GU2 7XH, UK.
| | - Fee Woodgate
- School of Psychology, University of Surrey, Guildford, Surrey, GU2 7XH, UK
| | - Lauren Taylor
- School of Psychology, University of Surrey, Guildford, Surrey, GU2 7XH, UK
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Farr NTH, Klosterhalfen B, Noé GK. Characterization in respect to degradation of titanium-coated polypropylene surgical mesh explanted from humans. J Biomed Mater Res B Appl Biomater 2023; 111:1142-1152. [PMID: 36610021 PMCID: PMC10952695 DOI: 10.1002/jbm.b.35221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Revised: 11/21/2022] [Accepted: 12/23/2022] [Indexed: 01/08/2023]
Abstract
Titanium-coated polypropylene (Ti-PP) mesh was introduced in 2002 as a surgical mesh for the treatment of hernias and shortly after for pelvic floor surgery, with the aim of improving biocompatibility when compared to non-titanised/regular PP mesh implants. The application of a titanium coating could also be beneficial to address concerns regarding the exposure of PP in an in vivo environment. Many studies have shown that PP, although it is widely accepted as a stable polymer, is subject to oxidation and degradation, such degradation affects the mechanical behavior, that is, the stiffness and tensile strength of PP mesh. Despite the wide clinical use of Ti-PP surgical meshes, no study has yet investigated the residual material properties post clinical deployment and subsequent explantation. In this study, two explanted Ti-PP mesh samples each having different incorporation durations from two patients were examined. Material analysis conducted within this study includes the following techniques: attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR), Raman spectroscopy, low voltage - scanning electron microscopy (LV-SEM), backscattered electron (BSE) imaging, energy dispersive X-ray spectroscopy (EDS) and secondary election hyperspectral imaging (SEHI). The hypothesis of this study is that the Ti coating successfully shields the PP mesh from oxidative stress in vivo and thus protects it from degradation. The results of this analysis show for the first time evidence of bulk oxidation, surface degradation, and environmental stress cracking on explanted Ti-PP meshes.
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Affiliation(s)
- Nicholas T. H. Farr
- Department of Materials Science and EngineeringUniversity of SheffieldSheffieldUK
- Insigneo Institute for in silico MedicineSheffieldUK
| | | | - Günter K. Noé
- Department of Obstetrics and Gynecology Rheinlandclinics DormagenUniversity of Witten HerdeckeDormagenGermany
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Johnston B, Adamus G, Ekere AI, Kowalczuk M, Tchuenbou-Magaia F, Radecka I. Bioconversion of Plastic Waste Based on Mass Full Carbon Backbone Polymeric Materials to Value-Added Polyhydroxyalkanoates (PHAs). Bioengineering (Basel) 2022; 9:bioengineering9090432. [PMID: 36134978 PMCID: PMC9496005 DOI: 10.3390/bioengineering9090432] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2022] [Revised: 08/26/2022] [Accepted: 08/28/2022] [Indexed: 11/28/2022] Open
Abstract
This review article will discuss the ways in which various polymeric materials, such as polyethylene (PE), polypropylene (PP), polystyrene (PS), and poly(ethylene terephthalate) (PET) can potentially be used to produce bioplastics, such as polyhydroxyalkanoates (PHAs) through microbial cultivation. We will present up-to-date information regarding notable microbial strains that are actively used in the biodegradation of polyolefins. We will also review some of the metabolic pathways involved in the process of plastic depolymerization and discuss challenges relevant to the valorization of plastic waste. The aim of this review is also to showcase the importance of methods, including oxidative degradation and microbial-based processes, that are currently being used in the fields of microbiology and biotechnology to limit the environmental burden of waste plastics. It is our hope that this article will contribute to the concept of bio-upcycling plastic waste to value-added products via microbial routes for a more sustainable future.
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Affiliation(s)
- Brian Johnston
- Science in Industry Research Centre (SIRC), SciTech Innovation Hub, Wolverhampton Science Park, Glaisher Drive, Wolverhampton WV10 9RU, UK
- School of Science, Faculty of Science and Engineering, University of Wolverhampton, Wolverhampton WV1 1LY, UK
- Correspondence: (B.J.); (I.R.)
| | - Grazyna Adamus
- Centre of Polymer and Carbon Materials, Polish Academy of Sciences, 41-800 Zabrze, Poland
| | - Anabel Itohowo Ekere
- School of Science, Faculty of Science and Engineering, University of Wolverhampton, Wolverhampton WV1 1LY, UK
| | - Marek Kowalczuk
- School of Science, Faculty of Science and Engineering, University of Wolverhampton, Wolverhampton WV1 1LY, UK
- Centre of Polymer and Carbon Materials, Polish Academy of Sciences, 41-800 Zabrze, Poland
| | - Fideline Tchuenbou-Magaia
- School of Engineering, Computing and Mathematical Sciences, Faculty of Science and Engineering, University of Wolverhampton, Wolverhampton WV1 1LY, UK
| | - Iza Radecka
- School of Science, Faculty of Science and Engineering, University of Wolverhampton, Wolverhampton WV1 1LY, UK
- Correspondence: (B.J.); (I.R.)
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7
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Lu X, Harman M, Todd Heniford B, Augenstein V, McIver B, Bridges W. Analyzing material changes consistent with degradation of explanted polymeric hernia mesh related to clinical characteristics. Surg Endosc 2022; 36:5121-5135. [PMID: 35257210 PMCID: PMC10851311 DOI: 10.1007/s00464-021-08882-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2021] [Accepted: 11/16/2021] [Indexed: 10/18/2022]
Abstract
BACKGROUND Proposed mechanisms that potentially contribute to polypropylene mesh degradation after in vivo exposure include oxidizing species and mechanical strains induced by normal healing, tissue integration, muscle contraction, and the immediate and chronic inflammatory responses. METHODS This study explores these potential degradation mechanisms using 63 mesh implants retrieved from patients after a median implantation time of 24 months following hernia repair surgery (mesh explants) and analysis of multivariate associations between the material changes and clinical characteristics. Specifically, polypropylene mesh degradation was characterized in terms of material changes in surface oxidation, crystallinity and mechanical properties, and clinical characteristics included mesh placement location, medical history and mesh selection. RESULTS Compared to pristine control samples, subsets of mesh explants had evidence of surface oxidation, altered crystallinity, or changed mechanical properties. Using multivariate statistical approach to control for clinical characteristics, infection was a significant factor affecting changes in mesh stiffness and mesh class was a significant factor affecting polypropylene crystallinity changes. CONCLUSIONS Highly variable in vivo conditions expose mesh to mechanisms that alter clinical outcomes and potentially contribute to mesh degradation. These PP mesh explants after 0.5 to 13 years in vivo had measurable changes in surface chemistry, crystallinity and mechanical properties, with significant trends associated with factors of mesh placement, mesh class, and infection.
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Affiliation(s)
- Xinyue Lu
- Department of Bioengineering, Clemson University, Clemson, SC, 29634, USA
| | - Melinda Harman
- Department of Bioengineering, Clemson University, Clemson, SC, 29634, USA.
| | - B Todd Heniford
- Gastrointestinal and Minimally Invasive Surgery, Carolinas Medical Center, Charlotte, NC, 28204, USA
| | - Vedra Augenstein
- Gastrointestinal and Minimally Invasive Surgery, Carolinas Medical Center, Charlotte, NC, 28204, USA
| | - Brittney McIver
- Department of Bioengineering, Clemson University, Clemson, SC, 29634, USA
| | - William Bridges
- Department of Mathematical Sciences, Clemson University, Clemson, SC, 29634, USA
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8
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Graul LM, Liu S, Maitland DJ. Theoretical error of sectional method for estimation of shape memory polyurethane foam mass loss. J Colloid Interface Sci 2022; 625:237-247. [PMID: 35716618 DOI: 10.1016/j.jcis.2022.06.045] [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: 12/16/2021] [Revised: 06/03/2022] [Accepted: 06/09/2022] [Indexed: 11/25/2022]
Abstract
INTRODUCTION Measuring in vivo degradation for polymeric scaffolds is critical for analysis of biocompatibility. Traditionally, histology has been used to estimate mass loss in scaffolds, allowing for simultaneous evaluation of mass loss and the biologic response to the implant. Oxidatively degradable shape memory polyurethane (SMP) foams have been implemented in two vascular occlusion devices: peripheral embolization device (PED) and neurovascular embolization device (NED). This work explores the errors introduced when using histological sections to evaluate mass loss. METHODS Models of the SMP foams were created to mimic the device geometry and the tetrakaidekahedral structure of the foam pore. These models were degraded in Blender for a wide range of possible degradation amounts and the mass loss was estimated using m sections. RESULTS As the number of sections (m) used to estimate mass loss for a volume increased the sampling error decreased and beyond m = 5, the decrease in error was insignificant. NED population and sampling errors were higher than for PED scenarios. When m ≥ 5, the averaged sampling error was below 1.5% for NED and 1% for PED scenarios. DISCUSSION/CONCLUSION This study establishes a baseline sampling error for estimating randomly degraded porous scaffolds using a sectional method. Device geometry and the stage of mass loss influence the sampling error. Future studies will use non-random degradation to further investigate in vivo mass loss scenarios.
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Affiliation(s)
- Lance M Graul
- Department of Biomedical Engineering, Texas A&M University, College Station, TX, United States
| | - Shuling Liu
- Department of Statistics, Texas A&M University, College Station, TX, United States
| | - Duncan J Maitland
- Department of Biomedical Engineering, Texas A&M University, College Station, TX, United States.
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9
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Ajdary R, Abidnejad R, Lehtonen J, Kuula J, Raussi-Lehto E, Kankuri E, Tardy B, Rojas OJ. Bacterial nanocellulose enables auxetic supporting implants. Carbohydr Polym 2022; 284:119198. [DOI: 10.1016/j.carbpol.2022.119198] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2021] [Revised: 01/26/2022] [Accepted: 01/27/2022] [Indexed: 01/08/2023]
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10
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Ajdary R, Reyes G, Kuula J, Raussi-Lehto E, Mikkola TS, Kankuri E, Rojas OJ. Direct Ink Writing of Biocompatible Nanocellulose and Chitosan Hydrogels for Implant Mesh Matrices. ACS POLYMERS AU 2022; 2:97-107. [PMID: 35445214 PMCID: PMC9011395 DOI: 10.1021/acspolymersau.1c00045] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/14/2021] [Revised: 11/23/2021] [Accepted: 11/29/2021] [Indexed: 01/28/2023]
Abstract
Direct ink writing via single or multihead extrusion is used to synthesize layer-by-layer (LbL) meshes comprising renewable polysaccharides. The best mechanical performance (683 ± 63 MPa modulus and 2.5 ± 0.4 MPa tensile strength) is observed for 3D printed structures with full infill density, given the role of electrostatic complexation between the oppositely charged components (chitosan and cellulose nanofibrils). The LbL structures develop an unexpectedly high wet stability that undergoes gradual weight loss at neutral and slightly acidic pH. The excellent biocompatibility and noncytotoxicity toward human monocyte/macrophages and controllable shrinkage upon solvent exchange make the cellular meshes appropriate for use as biomedical implants.
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Affiliation(s)
- Rubina Ajdary
- Department of Bioproducts and Biosystems, School of Chemical Engineering, Aalto University, PO Box 16300, FI-00076 Aalto, Espoo, Finland.,Bioproducts Institute, Department of Chemical & Biological Engineering, Department of Chemistry and Department of Wood Science, 2360 East Mall, The University of British Columbia, Vancouver, BC V6T 1Z3, Canada
| | - Guillermo Reyes
- Department of Bioproducts and Biosystems, School of Chemical Engineering, Aalto University, PO Box 16300, FI-00076 Aalto, Espoo, Finland
| | - Jani Kuula
- Department of Neuroscience and Biomedical Engineering, School of Science, Aalto University, PO Box 16300, FI-00076 Aalto, Espoo, Finland
| | - Eija Raussi-Lehto
- Department of Neuroscience and Biomedical Engineering, School of Science, Aalto University, PO Box 16300, FI-00076 Aalto, Espoo, Finland.,R&D Development Services, Metropolia University of Applied Sciences, PL 4000, FI-00079, Metropolia, Helsinki, Finland
| | - Tomi S Mikkola
- Department of Obstetrics and Gynecology, University of Helsinki, and Helsinki University Hospital, 00290 Helsinki, Finland
| | - Esko Kankuri
- Department of Pharmacology, Faculty of Medicine, University of Helsinki, 00290 Helsinki, Finland
| | - Orlando J Rojas
- Department of Bioproducts and Biosystems, School of Chemical Engineering, Aalto University, PO Box 16300, FI-00076 Aalto, Espoo, Finland.,Bioproducts Institute, Department of Chemical & Biological Engineering, Department of Chemistry and Department of Wood Science, 2360 East Mall, The University of British Columbia, Vancouver, BC V6T 1Z3, Canada
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11
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Klinge U, Dievernich A, Stegmaier J. Quantitative Characterization of Macrophage, Lymphocyte, and Neutrophil Subtypes Within the Foreign Body Granuloma of Human Mesh Explants by 5-Marker Multiplex Fluorescence Microscopy. Front Med (Lausanne) 2022; 9:777439. [PMID: 35242772 PMCID: PMC8887619 DOI: 10.3389/fmed.2022.777439] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Accepted: 01/11/2022] [Indexed: 11/13/2022] Open
Abstract
Foreign bodies such as fibers of a surgical mesh induce a typical reaction with an inflammatory infiltrate that forms a surrounding granuloma. This infiltrate is dominated by macrophages, lymphocytes, and neutrophils, whereas its extent of collaboration is widely unknown. In this study, we analyzed 12 samples of surgical meshes explanted from humans by multiplex analyses with three different 5-marker panels – 1. macrophage panel: CD68, CD86, CD105, CD163, and CD206; 2. lymphocyte panel: CD3, CD4, CD8, CD20, and CD68; and 3. neutrophil panel: CD15, histone, MPO, NE, and CD68. Measurement of fluorescence intensity within nuclear masks resulting from DAPI nuclear staining allows exact quantification of cells considered “positive” at a user-defined mean intensity threshold of > 100. Obviously, however, there is no natural threshold as a biological criterion for an intensity that separates “positive” stained cells from unstained cells (“negative”). Multiplex staining of 5 markers always reveals a high rate of coexpression for almost all of the 25 possible marker combinations (= 32 combinations, when using 5 markers simultaneously). The present staining results demonstrate that various morphological and functional subtypes of macrophages, lymphocytes, and neutrophils are abundant in the foreign body granuloma (FBG), which were investigated by regions of interest (ROI) with an area of 1 mm2. The widespread coexpression of two or more markers underscores the complex collaboration network of the inflammatory infiltrate. The ability to combine spatial distribution with exact numerical analysis may offer new perspectives for our understanding of the complex interactions in this multidimensional process.
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Affiliation(s)
- Uwe Klinge
- Department of General, Visceral and Transplant Surgery at the University Hospital of the RWTH Aachen, Aachen, Germany
| | - Axel Dievernich
- Forschungs- und Entwicklungsgesellschaft FEG Textiltechnik, Aachen, Germany
| | - Johannes Stegmaier
- Institute of Imaging and Computer Vision, RWTH Aachen University, Aachen, Germany
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12
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Abhari RE, Izett-Kay ML, Morris HL, Cartwright R, Snelling SJB. Host-biomaterial interactions in mesh complications after pelvic floor reconstructive surgery. Nat Rev Urol 2021; 18:725-738. [PMID: 34545239 DOI: 10.1038/s41585-021-00511-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/29/2021] [Indexed: 02/08/2023]
Abstract
Polypropylene (PPL) mesh is widely used in pelvic floor reconstructive surgery for prolapse and stress urinary incontinence. However, some women, particularly those treated using transvaginal PPL mesh placement for prolapse, experience intractable pain and mesh exposure or extrusion. Explanted tissue from patients with complications following transvaginal implantation of mesh is typified by a dense fibrous capsule with an immune cell-rich infiltrate, suggesting that the host immune response has a role in transvaginal PPL mesh complications through the separate contributions of the host (patient), the biological niche within which the material is implanted and biomaterial properties of the mesh. This immune response might be strongly influenced by both the baseline inflammatory status of the patient, surgical technique and experience, and the unique hormonal, immune and microbial tissue niche of the vagina. Mesh porosity, surface area and stiffness also might have an effect on the immune and tissue response to transvaginal mesh placement. Thus, a regulatory pathway is needed for mesh development that recognizes the roles of host and biological factors in driving the immune response to mesh, as well as mandatory mesh registries and the longitudinal surveillance of patients.
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Affiliation(s)
- Roxanna E Abhari
- Nuffield Department of Orthopaedics, Rheumatology, and Musculoskeletal Sciences (NDORMS), University of Oxford, Oxford, UK.
| | - Matthew L Izett-Kay
- Department of Urogynaecology, Oxford University Hospitals NHS Trust, Oxford, UK.,Nuffield Department of Women's & Reproductive Health, University of Oxford, Oxford, UK
| | - Hayley L Morris
- Nuffield Department of Orthopaedics, Rheumatology, and Musculoskeletal Sciences (NDORMS), University of Oxford, Oxford, UK
| | - Rufus Cartwright
- Department of Urogynaecology, London North West Hospitals NHS Trust, London, UK.,Department of Epidemiology & Biostatistics, Imperial College London, London, UK
| | - Sarah J B Snelling
- Nuffield Department of Orthopaedics, Rheumatology, and Musculoskeletal Sciences (NDORMS), University of Oxford, Oxford, UK.,NIHR Oxford Biomedical Research Centre, Oxford, UK
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13
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Farr NTH, Roman S, Schäfer J, Quade A, Lester D, Hearnden V, MacNeil S, Rodenburg C. A novel characterisation approach to reveal the mechano-chemical effects of oxidation and dynamic distension on polypropylene surgical mesh. RSC Adv 2021; 11:34710-34723. [PMID: 35494782 PMCID: PMC9042683 DOI: 10.1039/d1ra05944k] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Accepted: 10/17/2021] [Indexed: 11/21/2022] Open
Abstract
Polypropylene (PP) surgical mesh, used successfully for the surgical repair of abdominal hernias, is associated with serious clinical complications when used in the pelvic floor for repair of stress urinary incontinence or support of pelvic organ prolapse. While manufacturers claim that the material is inert and non-degradable, there is a growing body of evidence that asserts PP fibres are subject to oxidative damage and indeed explanted material from patients suffering with clinical complications has shown some evidence of fibre cracking and oxidation. It has been proposed that a pathological cellular response to the surgical mesh contributes to the medical complications; however, the mechanisms that trigger the specific host response against the material are not well understood. Specifically, this study was constructed to investigate the mechano-chemical effects of oxidation and dynamic distension on polypropylene surgical mesh. To do this we used a novel advanced spectroscopical characterisation technique, secondary electron hyperspectral imaging (SEHI), which is based on the collection of secondary electron emission spectra in a scanning electron microscope (SEM) to reveal mechanical-chemical reactions within PP meshes.
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Affiliation(s)
- Nicholas T H Farr
- Department of Materials Science and Engineering, University of Sheffield Sir Robert Hadfield Building, Mappin Street UK .,Insigneo Institute for in silico Medicine The Pam Liversidge Building, Sir Robert Hadfield Building, Mappin Street Sheffield UK
| | - Sabiniano Roman
- Department of Materials Science and Engineering, University of Sheffield Sir Robert Hadfield Building, Mappin Street UK
| | - Jan Schäfer
- Leibniz Institute for Plasma Science and Technology (INP e.V.) Felix-Hausdorff-Str. 2 17489 Greifswald Germany
| | - Antje Quade
- Leibniz Institute for Plasma Science and Technology (INP e.V.) Felix-Hausdorff-Str. 2 17489 Greifswald Germany
| | - Daniel Lester
- Polymer Characterisation Research Technology Platform, University of Warwick Library Road CV4 7AL Coventry UK
| | - Vanessa Hearnden
- Department of Materials Science and Engineering, University of Sheffield Sir Robert Hadfield Building, Mappin Street UK
| | - Sheila MacNeil
- Department of Materials Science and Engineering, University of Sheffield Sir Robert Hadfield Building, Mappin Street UK
| | - Cornelia Rodenburg
- Department of Materials Science and Engineering, University of Sheffield Sir Robert Hadfield Building, Mappin Street UK
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14
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Bhatt P, Pathak VM, Bagheri AR, Bilal M. Microplastic contaminants in the aqueous environment, fate, toxicity consequences, and remediation strategies. ENVIRONMENTAL RESEARCH 2021; 200:111762. [PMID: 34310963 DOI: 10.1016/j.envres.2021.111762] [Citation(s) in RCA: 70] [Impact Index Per Article: 23.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2021] [Revised: 06/10/2021] [Accepted: 07/22/2021] [Indexed: 06/13/2023]
Abstract
Microplastic is a fragmented plastic part that emerges as a potential marine and terrestrial contaminant. The microplastic wastes in marine and soil environments cause severe problems in living systems. Microplastic wastes have been linked to various health problems, including reproductive harm and obesity, plus issues such as organ problems and developmental delays in children. Recycling plastic/microplastics from the environment is very low, so remediating these polymers after their utilization is of paramount concern. The microplastic causes severe toxic effects and contaminates the environment. Microplastic affects marine life, microorganism in soil, soil enzymes, plants system, and physicochemical properties. Ecotoxicology of the microplastic raised many questions about its use and development from the environment. Various physicochemical and microbial technologies have been developed for their remediation from the environment. The microplastic effects are linked with its concentration, size, and shape in contaminated environments. Microplastic is able to sorb the inorganic and organic contaminants and affect their fate into the contaminated sites. Microbial technology is considered safer for the remediation of the microplastics via its unique metabolic machinery. Bioplastic is regarded as safer and eco-friendly as compared to plastics. The review article explored an in-depth understanding of the microplastic, its fate, toxicity to the environment, and robust remediation strategies.
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Affiliation(s)
- Pankaj Bhatt
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou, 510642, China; Guangdong Laboratory for Lingman Modern Agriculture, Guangzhou, 510642, China.
| | - Vinay Mohan Pathak
- Department of Microbiology, University of Delhi, South Campus, New Delhi, 110021, India; Department of Botany and Microbiology, Gurukul Kangri (Deemed to University), Haridwar, Uttarakhand, 249404, India
| | | | - Muhammad Bilal
- School of Life Science and Food Engineering, Huaiyin Institute of Technology, Huaian, 223003, China.
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15
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Wang H, Klosterhalfen B, Müllen A, Otto T, Dievernich A, Jockenhövel S. Degradation resistance of PVDF mesh in vivo in comparison to PP mesh. J Mech Behav Biomed Mater 2021; 119:104490. [PMID: 33780848 DOI: 10.1016/j.jmbbm.2021.104490] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Revised: 03/10/2021] [Accepted: 03/15/2021] [Indexed: 11/18/2022]
Abstract
Mesh implant has been applied in hernia repair and urogynecological reconstruction. Polypropylene (PP) is now the most widely used material for non-resorbable mesh implants. A degradation phenomenon of PP mesh, which is apparent on the mesh surface as cracking, flaking and peeling, was discovered in the 1990's. This phenomenon of mesh implant has drawn attention because of mesh-related litigations. Polyvinylidene fluoride (PVDF), due to its high biocompatible performance, has been used since 2003 as an alternative material for non-resorbable mesh implants. Till now, no such degradation phenomenon of PVDF mesh has been reported, although limited study on PVDF mesh is available. In this paper, we researched the degradation of PVDF meshes taking the degradation of PP mesh as a reference. The meshes analysed in this study were received from a previous animal experiment. To expose the surface of explanted meshes, a tissue removing method with protease was used and the result of this cleaning process was tested by X-ray Photoelectron Spectroscopy (XPS). The morphological condition of the mesh surface was compared using Scanning Electron Microscopy (SEM) and the chemical condition concerning degradation was analysed through Fourier Transform Infrared Spectroscopy (FTIR). The surface condition of PVDF mesh after 3-, 6-, 12- and 24-month implantation was illustrated and compared with two types of PP meshes. XPS revealed an absence of nitrogen, confirming the successful removal of tissue residues using protease. SEM results presented no notable morphological surface change of the PVDF mesh and progressive surface cracking processes over time of both types of PP meshes. FTIR spectra of the implanted PVDF meshes had no considerable difference from the spectrum of the pristine mesh, while FTIR spectra of both types of PP meshes had extra chemical functional groups (carbonyl (CO) and hydroxyl (-OH) groups) increasing with implantation time, indicating progressive degradation. This study highlights the morphological and chemical stability of the PVDF mesh and demonstrates that the PVDF mesh is more resistant to degradation in comparison to the other two types of PP meshes.
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Affiliation(s)
- Hongshi Wang
- Institute of Applied Medical Engineering, Dept. of Biohybrid & Medical Textiles (BioTex), RWTH Aachen University, Germany.
| | | | | | - Thomas Otto
- Department of Urology, Rheinland Clinic Lukas Hospital Neuss, Neuss, Germany
| | - Axel Dievernich
- Department of General, Visceral and Transplant Surgery, RWTH Aachen University Hospital, Aachen, Germany
| | - Stefan Jockenhövel
- Institute of Applied Medical Engineering, Dept. of Biohybrid & Medical Textiles (BioTex), RWTH Aachen University, Germany
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16
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Atanasova N, Stoitsova S, Paunova-Krasteva T, Kambourova M. Plastic Degradation by Extremophilic Bacteria. Int J Mol Sci 2021; 22:ijms22115610. [PMID: 34070607 PMCID: PMC8198520 DOI: 10.3390/ijms22115610] [Citation(s) in RCA: 43] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Revised: 05/23/2021] [Accepted: 05/24/2021] [Indexed: 01/03/2023] Open
Abstract
Intensive exploitation, poor recycling, low repeatable use, and unusual resistance of plastics to environmental and microbiological action result in accumulation of huge waste amounts in terrestrial and marine environments, causing enormous hazard for human and animal life. In the last decades, much scientific interest has been focused on plastic biodegradation. Due to the comparatively short evolutionary period of their appearance in nature, sufficiently effective enzymes for their biodegradation are not available. Plastics are designed for use in conditions typical for human activity, and their physicochemical properties roughly change at extreme environmental parameters like low temperatures, salt, or low or high pH that are typical for the life of extremophilic microorganisms and the activity of their enzymes. This review represents a first attempt to summarize the extraordinarily limited information on biodegradation of conventional synthetic plastics by thermophilic, alkaliphilic, halophilic, and psychrophilic bacteria in natural environments and laboratory conditions. Most of the available data was reported in the last several years and concerns moderate extremophiles. Two main questions are highlighted in it: which extremophilic bacteria and their enzymes are reported to be involved in the degradation of different synthetic plastics, and what could be the impact of extremophiles in future technologies for resolving of pollution problems.
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17
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Nakai K, Hamuro A, Kitada K, Tahara M, Misugi T, Nakano A, Koyama M, Tachibana D. Preliminary evaluation of the short-term outcomes of polytetrafluoroethylene mesh for pelvic organ prolapse. J Obstet Gynaecol Res 2021; 47:2529-2536. [PMID: 33949055 DOI: 10.1111/jog.14795] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Revised: 03/13/2021] [Accepted: 04/02/2021] [Indexed: 11/30/2022]
Abstract
AIM Tension-free vaginal mesh (TVM) surgery using synthetic polypropylene (PP) soft mesh had spread rapidly. However, the frequency of mesh-related postoperative complications had increased, and PP was banned in April 2019. In Japan, however, transvaginal surgery using polytetrafluoroethylene (PTFE) mesh had been approved. In this study, we evaluated the clinical outcome and quality of life (QOL) of the postoperative course using PP mesh and PTFE mesh (named "ORIHIME™" ) in a combination surgery for utero-sacral ligament suspension and anterior vaginal support using anterior TVM. METHODS The vaginal hysterectomy and utero-sacral ligament colpopexy augmented by anterior vaginal mesh implants using PP mesh and PTFE mesh were performed on patients with stage III to IV cystocele and uterine prolapse. The clinical outcome and QOL changes in their postoperative course were evaluated by comparing 15 cases of PP mesh and 13 cases of PTFE mesh. RESULTS There was no difference between the PP group and PTFE group in characteristics. No mesh-related complications occurred during the follow-up period. With regard to the pelvic organ prolapse quantification (POP-Q) score, no significant difference was found between the two groups. Comparing the postoperative QOL of both groups, the PTFE group had significantly higher values in two domains than PP group (SF-12v2 questionnaire). CONCLUSIONS We used the world's first PTFE mesh to compare PP mesh with postoperative POP-Q and QOL after the same surgery, with the same operator, and at the same institution. The results showed no significant difference between both mesh materials in the short-term.
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Affiliation(s)
- Kensaku Nakai
- Department of Obstetrics and Gynecology, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - Akihiro Hamuro
- Department of Obstetrics and Gynecology, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - Kohei Kitada
- Department of Obstetrics and Gynecology, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - Mie Tahara
- Department of Obstetrics and Gynecology, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - Takuya Misugi
- Department of Obstetrics and Gynecology, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - Akemi Nakano
- Department of Obstetrics and Gynecology, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - Masayasu Koyama
- Department of Obstetrics and Gynecology, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - Daisuke Tachibana
- Department of Obstetrics and Gynecology, Osaka City University Graduate School of Medicine, Osaka, Japan
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18
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Ferreira FV, Otoni CG, Lopes JH, de Souza LP, Mei LHI, Lona LMF, Lozano K, Lobo AO, Mattoso LHC. Ultrathin polymer fibers hybridized with bioactive ceramics: A review on fundamental pathways of electrospinning towards bone regeneration. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2021; 123:111853. [PMID: 33812570 DOI: 10.1016/j.msec.2020.111853] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2020] [Revised: 12/21/2020] [Accepted: 12/26/2020] [Indexed: 10/22/2022]
Affiliation(s)
- Filipe V Ferreira
- School of Chemical Engineering, University of Campinas (UNICAMP), Campinas, SP, Brazil
| | - Caio G Otoni
- Department of Materials Engineering (DEMa), Federal University of São Carlos (UFSCar), São Carlos, SP, Brazil
| | - João H Lopes
- Department of Chemistry, Division of Fundamental Sciences (IEF), Technological Institute of Aeronautics (ITA), São Jose dos Campos, SP, Brazil
| | - Lucas P de Souza
- College of Engineering and Physical Sciences, Aston Institute of Materials Research, Aston University, Birmingham, UK
| | - Lucia H I Mei
- School of Chemical Engineering, University of Campinas (UNICAMP), Campinas, SP, Brazil
| | - Liliane M F Lona
- School of Chemical Engineering, University of Campinas (UNICAMP), Campinas, SP, Brazil
| | - Karen Lozano
- Department of Mechanical Engineering, The University of Texas Rio Grande Valley, Edinburg, TX, USA
| | - Anderson O Lobo
- Interdisciplinary Laboratory for Advanced Materials, BioMatLab, Materials Science and Engineering Graduate Program, Federal University of Piaui, Teresina, PI, Brazil.
| | - Luiz H C Mattoso
- Nanotechnology National Laboratory for Agriculture (LNNA), Embrapa Instrumentation, São Carlos, SP, Brazil.
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19
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Mridha AR, Dargaville TR, Dalton PD, Carroll L, Morris MB, Vaithilingam V, Tuch BE. Prevascularized Retrievable Hybrid Implant to Enhance Function of Subcutaneous Encapsulated Islets. Tissue Eng Part A 2020; 28:212-224. [PMID: 33081600 DOI: 10.1089/ten.tea.2020.0179] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Replacement of pancreatic β-cells is one of the most promising treatment options for treatment of type 1 diabetes (T1D), even though, toxic immunosuppressive drugs are required. In this study, we aim to deliver allogeneic β-cell therapies without antirejection drugs using a bioengineered hybrid device that contains microencapsulated β-cells inside 3D polycaprolactone (PCL) scaffolds printed using melt electrospin writing (MEW). Mouse β-cell (MIN6) pseudoislets and QS mouse islets are encapsulated in alginate microcapsules, without affecting viability and insulin secretion. Microencapsulated MIN6 cells are then seeded within 3D MEW scaffolds, and these hybrid devices implanted subcutaneously in streptozotocin-treated diabetic NOD/SCID and BALB/c mice. Similar to NOD/SCID mice, blood glucose levels (BGL) are lowered from 30.1 to 4.8 mM in 25-41 days in BALB/c. In contrast, microencapsulated islets placed in prevascularized MEW scaffold 3 weeks after implantation in BALB/c mice normalize BGL (<12 mM) more rapidly, lasting for 60-105 days. The lowering of glucose levels is confirmed by an intraperitoneal glucose tolerance test. Vascularity within the implanted grafts is demonstrated and quantified by 3D-doppler ultrasound, with a linear increase over 4 weeks (r = 0.65). Examination of the device at 5 weeks shows inflammatory infiltrates of neutrophils, macrophages, and B-lymphocytes on the MEW scaffolds, but not on microcapsules, which have infrequent profibrotic walling. In conclusion, we demonstrate the fabrication of an implantable and retrievable hybrid device for vascularization and enhancing the survival of encapsulated islets implanted subcutaneously in an allotransplantation setting without immunosuppression. This study provides proof-of-concept for the application of such devices for human use, but, will require modifications to allow translation to people with T1D. Impact statement The retrievable 3D printed PCL scaffold we have produced promotes vascularization when implanted subcutaneously and allows seeded microencapsulated insulin-producing cells to normalize blood glucose of diabetic mice for at least 2 months, without the need for antirejection drugs to be administered. The scaffold is scalable for possible human use, but will require modification to ensure that normalization of blood glucose levels can be maintained long term.
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Affiliation(s)
- Auvro R Mridha
- Discipline of Physiology, Faculty of Medicine and Health, School of Medical Sciences, The University of Sydney, Sydney, Australia.,Australian Foundation for Diabetes Research, Sydney, Australia.,Bosch Institute, The University of Sydney, Sydney, Australia
| | - Tim R Dargaville
- Institute of Health and Biomedical Innovation, Queensland University of Technology, Queensland, Australia
| | - Paul D Dalton
- Department of Functional Materials in Medicine and Dentistry, University of Würzburg, Würzburg, Germany
| | - Luke Carroll
- Discipline of Physiology, Faculty of Medicine and Health, School of Medical Sciences, The University of Sydney, Sydney, Australia.,Australian Foundation for Diabetes Research, Sydney, Australia.,Now Based at NHMRC Clinical Trials Centre, The University of Sydney, Sydney, Australia
| | - Michael B Morris
- Discipline of Physiology, Faculty of Medicine and Health, School of Medical Sciences, The University of Sydney, Sydney, Australia.,Bosch Institute, The University of Sydney, Sydney, Australia
| | - Vijayaganapathy Vaithilingam
- Australian Foundation for Diabetes Research, Sydney, Australia.,Cell Biology Inspired Tissue Engineering (CBITE), MERLN Institute for Technology-Inspired Regenerative Medicine, Maastricht University, Maastricht, The Netherlands
| | - Bernard E Tuch
- Discipline of Physiology, Faculty of Medicine and Health, School of Medical Sciences, The University of Sydney, Sydney, Australia.,Australian Foundation for Diabetes Research, Sydney, Australia
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20
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Kawaguchi S, Narimoto K, Hamuro A, Nakagawa T, Urata S, Kadomoto S, Iwamoto H, Yaegashi H, Iijima M, Nohara T, Shigehara K, Izumi K, Tachibana D, Kadono Y, Mizokami A, Koyama M. Transvaginal polytetrafluoroethylene mesh surgery for pelvic organ prolapse: 1-year clinical outcomes. Int J Urol 2020; 28:268-272. [PMID: 33760315 DOI: 10.1111/iju.14444] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Accepted: 10/25/2020] [Indexed: 12/18/2022]
Abstract
OBJECTIVES To evaluate the safety and efficacy of transvaginal mesh surgery using a polytetrafluoroethylene mesh to treat pelvic organ prolapse. METHODS This prospective observational study included women undergoing transvaginal mesh surgery for pelvic organ prolapse that used new polytetrafluoroethylene mesh cut into a shape similar to that of Elevate. We evaluated the subjective and objective outcomes at 3 and 12 months, as well as postoperative complication rates. RESULTS This study included 55 patients. The pelvic organ prolapse quantification scores improved significantly at 3 and 12 months after surgery compared with scores before surgery. In four patients (7.3%), a pelvic examination showed stage 2 objective recurrence without subjective symptoms. Clavien-Dindo grades 2 and 3 perioperative complications were observed in 9.1% and 1.8% of the patients, respectively. Vaginal mesh exposure occurred in one patient (1.8%) at the time of the 3-month follow-up evaluation. The mesh was exposed at the proximal midline of the anterior vaginal wall. CONCLUSIONS These findings show the safe and effective use of the polytetrafluoroethylene mesh for transvaginal mesh surgery.
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Affiliation(s)
- Shohei Kawaguchi
- Department of Integrative Cancer Therapy and Urology, Kanazawa University Graduate School of Medical Science, Kanazawa, Ishikawa, Japan
| | - Kazutaka Narimoto
- Department of Urology, St. Luke's International Hospital, Tokyo, Japan
| | - Akihiro Hamuro
- Department of Obstetrics and Gynecology, Osaka City University Graduate School of Medicine, Osaka, Osaka, Japan
| | - Tomomi Nakagawa
- Department of Integrative Cancer Therapy and Urology, Kanazawa University Graduate School of Medical Science, Kanazawa, Ishikawa, Japan
| | - Satoko Urata
- Department of Integrative Cancer Therapy and Urology, Kanazawa University Graduate School of Medical Science, Kanazawa, Ishikawa, Japan
| | - Suguru Kadomoto
- Department of Integrative Cancer Therapy and Urology, Kanazawa University Graduate School of Medical Science, Kanazawa, Ishikawa, Japan
| | - Hiroaki Iwamoto
- Department of Integrative Cancer Therapy and Urology, Kanazawa University Graduate School of Medical Science, Kanazawa, Ishikawa, Japan
| | - Hiroshi Yaegashi
- Department of Integrative Cancer Therapy and Urology, Kanazawa University Graduate School of Medical Science, Kanazawa, Ishikawa, Japan
| | - Masashi Iijima
- Department of Integrative Cancer Therapy and Urology, Kanazawa University Graduate School of Medical Science, Kanazawa, Ishikawa, Japan
| | - Takahiro Nohara
- Department of Integrative Cancer Therapy and Urology, Kanazawa University Graduate School of Medical Science, Kanazawa, Ishikawa, Japan
| | - Kazuyoshi Shigehara
- Department of Integrative Cancer Therapy and Urology, Kanazawa University Graduate School of Medical Science, Kanazawa, Ishikawa, Japan
| | - Kouji Izumi
- Department of Integrative Cancer Therapy and Urology, Kanazawa University Graduate School of Medical Science, Kanazawa, Ishikawa, Japan
| | - Daisuke Tachibana
- Department of Obstetrics and Gynecology, Osaka City University Graduate School of Medicine, Osaka, Osaka, Japan
| | - Yoshifumi Kadono
- Department of Integrative Cancer Therapy and Urology, Kanazawa University Graduate School of Medical Science, Kanazawa, Ishikawa, Japan
| | - Atsushi Mizokami
- Department of Integrative Cancer Therapy and Urology, Kanazawa University Graduate School of Medical Science, Kanazawa, Ishikawa, Japan
| | - Masayasu Koyama
- Department of Obstetrics and Gynecology, Osaka City University Graduate School of Medicine, Osaka, Osaka, Japan
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21
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Huang WC, Yang JM, Chen HF. Five-year clinical and imaging outcomes of primary transobturator midurethral sling procedures for uncomplicated urodynamic stress incontinence. Maturitas 2020; 138:42-50. [DOI: 10.1016/j.maturitas.2020.05.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Revised: 04/24/2020] [Accepted: 05/08/2020] [Indexed: 10/24/2022]
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22
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Rovner E, Tayrac R, Kirschner‐Hermanns R, Veit‐Rubin N, Anding R. Is polypropylene mesh material fundamentally safe for use as a reconstructive material in vaginal surgery: ICI‐RS 2019? Neurourol Urodyn 2020; 39 Suppl 3:S132-S139. [DOI: 10.1002/nau.24312] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2019] [Accepted: 01/27/2020] [Indexed: 12/14/2022]
Affiliation(s)
- Eric Rovner
- Department of UrologyMedical University of South Carolina Charleston South Carolina
| | - Renaud Tayrac
- Department of Obstetrics and GynecologyCaremeau University Hospital Nimes France
| | | | | | - Ralf Anding
- Clinic of Urology‐/Neuro‐UrologyUniversity Clinic Bonn Germany
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23
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Bredikhin M, Gil D, Rex J, Cobb W, Reukov V, Vertegel A. Anti-inflammatory coating of hernia repair meshes: a 5-rabbit study. Hernia 2020; 24:1191-1199. [PMID: 32026188 PMCID: PMC7223801 DOI: 10.1007/s10029-020-02122-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2019] [Accepted: 01/04/2020] [Indexed: 11/26/2022]
Abstract
PURPOSE Polymeric mesh implantation has become the golden standard in hernia repair, which nowadays is one of the most frequently performed surgeries in the world. However, many biocompatibility issues remain to be a concern for hernioplasty, with chronic pain being the most notable post-operative complication. Oxidative stress appears to be a major factor in the development of those complications. Lack of material inertness in vivo and oxidative environment formed by inflammatory cells result in both mesh deterioration and slowed healing process. In a pilot in vivo study, we prepared and characterized polypropylene hernia meshes with vitamin E (α-tocopherol)-a potent antioxidant. The results of that study supported the use of vitamin E as potential coating to alleviate post-surgical inflammation, but the pilot nature of the study yielded limited statistical data. The purpose of this study was to verify the observed trend of the pilot study statistically. METHODS In this work, we conducted a 5-animal experiment where we have implanted vitamin E-coated and uncoated control meshes into the abdominal walls of rabbits. Histology of the mesh-adjacent tissues and electron microscopy of the explanted mesh surface were conducted to characterize host tissue response to the implanted meshes. RESULTS As expected, modified meshes exhibited reduced foreign body reaction, as evidenced by histological scores for fatty infiltrates, macrophages, neovascularization, and collagen organization, as well as by the surface deterioration of the meshes. CONCLUSION In conclusion, results indicate that vitamin E coating reduces inflammatory response following hernioplasty and protects mesh material from oxidative deterioration.
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Affiliation(s)
- M Bredikhin
- Department of Bioengineering, Clemson University, 301 Rhodes Hall, Clemson, SC, 29634, USA
| | - D Gil
- Department of Bioengineering, Clemson University, 301 Rhodes Hall, Clemson, SC, 29634, USA
| | - J Rex
- Department of Bioengineering, Clemson University, 301 Rhodes Hall, Clemson, SC, 29634, USA
| | - W Cobb
- Department of Surgery, The Hernia Center, Prisma Health, 2104 Woodruff rd., Greenville, SC, 29607, USA
| | - V Reukov
- Department of Bioengineering, Clemson University, 301 Rhodes Hall, Clemson, SC, 29634, USA
| | - A Vertegel
- Department of Bioengineering, Clemson University, 301 Rhodes Hall, Clemson, SC, 29634, USA.
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24
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Implantation Time Has No Effect on the Morphology and Extent of Previously Reported "Degradation" of Prolene Pelvic Mesh. Female Pelvic Med Reconstr Surg 2020; 26:128-136. [PMID: 31990801 DOI: 10.1097/spv.0000000000000837] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
OBJECTIVES Prolene polypropylene ("Prolene") meshes demonstrate no in vivo degradation, yet some claim degradation continues until no more Prolene polypropylene can be oxidized. We studied whether implantation time affects the morphology/extent of previously reported as cracking/degradation of completely cleaned Prolene explants. METHODS Urogynecological explants (248 patients) were collected. After excluding non-Prolene/unknown meshes and those without known implantation times, completely cleaned explants (n = 205; 0.2-14.4 years implantation) were analyzed with light microscopy, scanning electron microscopy, and Fourier transform infrared spectroscopy. Based on implant times and storage (fixative or dry), representative specimens were randomly selected for comparison. Controls were unused ("exemplar") TVT specimens with and without intentional oxidation via ultraviolet light exposure. RESULTS Prolene explants included 31 dry (18 TVT; 7 Prolift; 4 Gynemesh; 2 others) and 174 wet (87 TVT; 47 Prolift; 10 Gynemesh; 30 others) specimens. Specimens had similar morphologies before cleaning. Progressive cleaning removed tissue and cracked tissue-related material exposing smooth, unoxidized, and nondegraded fibers, with no visible gradient-type/ductile damage. Fourier transform infrared spectroscopy of the explants confirmed progressive loss of proteins. Cleaning intentionally oxidized exemplars did not remove oxidized carbonyl frequencies and showed deep cracks and gross fiber rupture/embrittlement, unlike the explants and nonoxidized exemplars. CONCLUSIONS If in vivo Prolene degradation exists, there should be wide-ranging crack morphology and nonuniform crack penetration, as well as more cracking, degradation, and physical breakage for implants of longer implantation times, but this was not the case. There is no morphologic or spectral/chemical evidence of Prolene mesh degradation after up to 14.4 years in vivo.
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Danso D, Chow J, Streit WR. Plastics: Environmental and Biotechnological Perspectives on Microbial Degradation. Appl Environ Microbiol 2019; 85:e01095-19. [PMID: 31324632 PMCID: PMC6752018 DOI: 10.1128/aem.01095-19] [Citation(s) in RCA: 286] [Impact Index Per Article: 57.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
Plastics are widely used in the global economy, and each year, at least 350 to 400 million tons are being produced. Due to poor recycling and low circular use, millions of tons accumulate annually in terrestrial or marine environments. Today it has become clear that plastic causes adverse effects in all ecosystems and that microplastics are of particular concern to our health. Therefore, recent microbial research has addressed the question of if and to what extent microorganisms can degrade plastics in the environment. This review summarizes current knowledge on microbial plastic degradation. Enzymes available act mainly on the high-molecular-weight polymers of polyethylene terephthalate (PET) and ester-based polyurethane (PUR). Unfortunately, the best PUR- and PET-active enzymes and microorganisms known still have moderate turnover rates. While many reports describing microbial communities degrading chemical additives have been published, no enzymes acting on the high-molecular-weight polymers polystyrene, polyamide, polyvinylchloride, polypropylene, ether-based polyurethane, and polyethylene are known. Together, these polymers comprise more than 80% of annual plastic production. Thus, further research is needed to significantly increase the diversity of enzymes and microorganisms acting on these polymers. This can be achieved by tapping into the global metagenomes of noncultivated microorganisms and dark matter proteins. Only then can novel biocatalysts and organisms be delivered that allow rapid degradation, recycling, or value-added use of the vast majority of most human-made polymers.
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Affiliation(s)
- Dominik Danso
- Department of Microbiology and Biotechnology, University of Hamburg, Hamburg, Germany
| | - Jennifer Chow
- Department of Microbiology and Biotechnology, University of Hamburg, Hamburg, Germany
| | - Wolfgang R Streit
- Department of Microbiology and Biotechnology, University of Hamburg, Hamburg, Germany
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Landmarks in vaginal mesh development: polypropylene mesh for treatment of SUI and POP. Nat Rev Urol 2019; 16:675-689. [PMID: 31548731 DOI: 10.1038/s41585-019-0230-2] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/20/2019] [Indexed: 01/03/2023]
Abstract
Vaginal meshes used in the treatment of stress urinary incontinence (SUI) and pelvic organ prolapse (POP) have produced highly variable outcomes, causing life-changing complications in some patients while providing others with effective, minimally invasive treatments. The risk:benefit ratio when using vaginal meshes is a complex issue in which a combination of several factors, including the inherent incompatibility of the mesh material with some applications in pelvic reconstructive surgeries and the lack of appropriate regulatory approval processes at the time of the premarket clearance of these products, have contributed to the occurrence of complications caused by vaginal mesh. Surgical mesh used in hernia repair has evolved over many years, from metal implants to knitted polymer meshes that were adopted for use in the pelvic floor for treatment of POP and SUI. The evolution of the material and textile properties of the surgical mesh was guided by clinical feedback from hernia repair procedures, which were also being modified to obtain the best outcomes with use of the mesh. Current evidence shows how surgical mesh fails biomechanically when used in the pelvic floor and materials with improved performance can be developed using modern material processing and tissue engineering techniques.
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Gamage PL, Ren Y, Slape CM, Ambike IM, Wallace AC, Fiedler AK, González JE, Biewer MC, Zimmern P, Stefan MC. Oxidative Degradation of Polypropylene Mesh in E. coli Environment. ACS APPLIED BIO MATERIALS 2019; 2:4027-4036. [DOI: 10.1021/acsabm.9b00547] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Prabhath L. Gamage
- Department of Chemistry and Biochemistry, The University of Texas at Dallas, Richardson, Texas 75080, United States
| | - Yixin Ren
- Department of Chemistry and Biochemistry, The University of Texas at Dallas, Richardson, Texas 75080, United States
| | - Coreen M. Slape
- Department of Biology, The University of Texas at Dallas, Richardson, Texas 75080, United States
| | - Iravati M. Ambike
- Department of Bioengineering, The University of Texas at Dallas, Richardson, Texas 75080, United States
| | - Adele C. Wallace
- Department of Chemistry and Biochemistry, The University of Texas at Dallas, Richardson, Texas 75080, United States
| | - Anna K. Fiedler
- Department of Chemistry and Biochemistry, The University of Texas at Dallas, Richardson, Texas 75080, United States
| | - Juan E. González
- Department of Biology, The University of Texas at Dallas, Richardson, Texas 75080, United States
| | - Michael C. Biewer
- Department of Chemistry and Biochemistry, The University of Texas at Dallas, Richardson, Texas 75080, United States
| | - Philippe Zimmern
- Department of Urology, The University of Texas Southwestern Medical Center at Dallas, Dallas, Texas 75204, United States
| | - Mihaela C. Stefan
- Department of Chemistry and Biochemistry, The University of Texas at Dallas, Richardson, Texas 75080, United States
- Department of Bioengineering, The University of Texas at Dallas, Richardson, Texas 75080, United States
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Polypropylene mesh and systemic side effects in inguinal hernia repair: current evidence. Ir J Med Sci 2019; 188:1349-1356. [PMID: 30915679 DOI: 10.1007/s11845-019-02008-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2019] [Accepted: 03/12/2019] [Indexed: 12/12/2022]
Abstract
INTRODUCTION Increasing awareness and regulatory body attention is directed towards the insertion of synthetic material for a variety of surgical procedures. This review aims to assess current evidence regarding systemic and auto-immune effects of polypropylene mesh insertion in hernia repair. METHODS The electronic literature on systemic and auto-immune effects associated with mesh insertion was examined. RESULTS Foreign body reaction following mesh implantation initiates an acute inflammatory cellular response. Involved markers such as IL-1, IL-6, IL-10 and fibrinogen are increased in circulation in the presence of mesh but return to normal at 7 days post operatively. Oxidative degradation of implanted mesh is likely, but no evidence exists to support systemic absorption or resulting disease effects. Variable cytokine production in healthy hosts leading to unpredictable or overwhelming response to implanted biomaterial warrants further investigation. Clinical studies show no associated long-term systemic effects with mesh. CONCLUSION To date, there remains no evidence to link polypropylene mesh and systemic or auto-immune symptoms. Based on current evidence, the use of polypropylene mesh is supported.
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Bracale U, Melillo P, Piaggio D, Pecchia L, Cuccurullo D, Milone M, De Palma GD, Cavallaro G, Campanelli G, Merola G, Stabilini C. Is Shouldice the best NON-MESH inguinal hernia repair technique? A systematic review and network metanalysis of randomized controlled trials comparing Shouldice and Desarda. Int J Surg 2019; 62:12-21. [PMID: 30639473 DOI: 10.1016/j.ijsu.2019.01.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2018] [Revised: 11/20/2018] [Accepted: 01/05/2019] [Indexed: 01/08/2023]
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Taylor D. The failure of polypropylene surgical mesh in vivo. J Mech Behav Biomed Mater 2018; 88:370-376. [DOI: 10.1016/j.jmbbm.2018.08.041] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2018] [Revised: 05/01/2018] [Accepted: 08/27/2018] [Indexed: 10/28/2022]
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Machatschek R, Schulz B, Lendlein A. Langmuir Monolayers as Tools to Study Biodegradable Polymer Implant Materials. Macromol Rapid Commun 2018; 40:e1800611. [PMID: 30387219 DOI: 10.1002/marc.201800611] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2018] [Revised: 09/24/2018] [Indexed: 11/06/2022]
Abstract
Langmuir monolayers provide a fast and elegant route to analyze the degradation behavior of biodegradable polymer materials. In contrast to bulk materials, diffusive transport of reactants and reaction products in the (partially degraded) material can be neglected at the air-water interface, allowing for the study of molecular degradation kinetics in experiments taking less than a day and in some cases just a few minutes, in contrast to experiments with bulk materials that can take years. Several aspects of the biodegradation behavior of polymer materials, such as the interaction with biomolecules and degradation products, are directly observable. Expanding the technique with surface-sensitive instrumental techniques enables evaluating the evolution of the morphology, chemical composition, and the mechanical properties of the degrading material in situ. The potential of the Langmuir monolayer degradation technique as a predictive tool for implant degradation when combined with computational methods is outlined, and related open questions and strategies to overcome these challenges are pointed out.
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Affiliation(s)
- Rainhard Machatschek
- Institute of Biomaterial Science and Berlin-Brandenburg Center for Regenerative Therapies, Helmholtz-Zentrum Geesthacht, Kantstraße 55,, 14513, Teltow, Germany
| | - Burkhard Schulz
- Institute of Biomaterial Science and Berlin-Brandenburg Center for Regenerative Therapies, Helmholtz-Zentrum Geesthacht, Kantstraße 55,, 14513, Teltow, Germany.,Institute of Chemistry, University of Potsdam, Karl-Liebknecht-Straße 24-25,, 14469, Potsdam, Germany
| | - Andreas Lendlein
- Institute of Biomaterial Science and Berlin-Brandenburg Center for Regenerative Therapies, Helmholtz-Zentrum Geesthacht, Kantstraße 55,, 14513, Teltow, Germany.,Institute of Chemistry, University of Potsdam, Karl-Liebknecht-Straße 24-25,, 14469, Potsdam, Germany
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Ludwicka K, Kolodziejczyk M, Gendaszewska-Darmach E, Chrzanowski M, Jedrzejczak-Krzepkowska M, Rytczak P, Bielecki S. Stable composite of bacterial nanocellulose and perforated polypropylene mesh for biomedical applications. J Biomed Mater Res B Appl Biomater 2018; 107:978-987. [PMID: 30261126 DOI: 10.1002/jbm.b.34191] [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: 01/08/2018] [Revised: 05/16/2018] [Accepted: 06/10/2018] [Indexed: 11/07/2022]
Abstract
The article presents the method of preparation of new, stable bacterial cellulose composites with perforated solid materials for biomedical applications, comprising reconstructive surgery of soft and hard tissues. The composites were obtained in specially designed bioreactors equipped with a set of perforated mesh stripes threaded vertically to the culture medium, ensuring perpendicular growth of bacterial nanocellulose synthesized by Komagataeibacter xylinus E25 in stationary culture. The developed biocomposites have been tested for stability and mechanical strength, as well as for their in vitro inflammatory responses shown as mast cell degranulation with N-acetyl-β-d-hexosaminidase release and mast cell adhesion. The obtained results indicate that the composites components are well integrated after the process of cultivation and purification. Bacterial nanocellulose does not negatively influence mechanical properties of the polypropylene porous mesh, preserving its tensile strength, elasticity, and load. Moreover, application of bacterial cellulose makes the composites less immunogenic as compared to polypropylene itself. Therefore, the composites have the great potential of application in medicine, and depending on the applied porous material, might be used either in hernioplasty (if porous hernia mesh is used), cranioplasty (if perforated metal or polymeric cranial implant is applied), or as a protective barrier in any application that requires biocompatibility or antiadhesive properties improvement. © 2018 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater 107B: 978-987, 2019.
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Affiliation(s)
- Karolina Ludwicka
- Institutte of Technical Biochemistry, Lodz University of Technology, Lodz 90-924, Stefanowskiego 4/10, Poland
| | - Marek Kolodziejczyk
- Institutte of Technical Biochemistry, Lodz University of Technology, Lodz 90-924, Stefanowskiego 4/10, Poland
| | - Edyta Gendaszewska-Darmach
- Institutte of Technical Biochemistry, Lodz University of Technology, Lodz 90-924, Stefanowskiego 4/10, Poland
| | - Michal Chrzanowski
- Faculty of Material Technologies and Textile Design, Lodz University of Technology, Lodz 90-924, Zeromskiego 116, Poland
| | | | - Przemyslaw Rytczak
- Institutte of Technical Biochemistry, Lodz University of Technology, Lodz 90-924, Stefanowskiego 4/10, Poland
| | - Stanislaw Bielecki
- Institutte of Technical Biochemistry, Lodz University of Technology, Lodz 90-924, Stefanowskiego 4/10, Poland
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Tang F, Bao P, Roy A, Wang Y, Su Z. In-situ spectroscopic and thermal analyses of phase domains in high-impact polypropylene. POLYMER 2018. [DOI: 10.1016/j.polymer.2018.03.037] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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Ferzoco SJ. Early experience outcome of a reinforced Bioscaffold in inguinal hernia repair: A case series. INTERNATIONAL JOURNAL OF SURGERY OPEN 2018. [DOI: 10.1016/j.ijso.2018.06.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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Campanelli G, Bruni PG, Morlacchi A, Lombardo F, Cavalli M. Primary inguinal hernia: The open repair today pros and cons. Asian J Endosc Surg 2017; 10:236-243. [PMID: 28727316 DOI: 10.1111/ases.12394] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/09/2017] [Revised: 05/03/2017] [Accepted: 05/11/2017] [Indexed: 11/28/2022]
Abstract
Open anterior repair for inguinal hernia offers several distinct advantages over endoscopic repair, especially when real-world effectiveness is taken into account. The learning curve for endoscopic techniques is long, whereas the Lichtenstein and other open tension-free techniques are easier to teach and replicate at all levels. The outcomes of Lichtenstein repairs for primary inguinal hernia as performed by non-experts and supervised residents are comparable to those of experts. Moreover, open tension-free repair does not require expensive instruments or dedicated equipment, other than the prosthetic mesh. As such, it is feasible in any operating room anywhere in the world with limited costs. In our opinion, the most important advantage offered by open tension-free repair is that it can be performed under local anesthesia. Nevertheless, local anesthesia has some disadvantages: it requires training, excellent knowledge of the anatomy and the necessary technique, patience, and gentle handling of the tissues. Open inguinal hernia repair is a procedure that every surgeon should know and be able to perform because it is necessary to treat two conditions, groin hernia recurrence after a posterior approach (both laparoscopic and open) and pubic inguinal pain syndrome.
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Affiliation(s)
- Giampiero Campanelli
- University of Insubria Day and Week Surgery Unit, General Surgery Department, Center of Research on the Pathology and High Specialization on the Abdominal Wall and Hernia Surgery, Milano Hernia Center, Istituto Clinico Sant'Ambrogio, Milan, Italy
| | - Piero Giovanni Bruni
- University of Insubria Day and Week Surgery Unit, General Surgery Department, Center of Research on the Pathology and High Specialization on the Abdominal Wall and Hernia Surgery, Milano Hernia Center, Istituto Clinico Sant'Ambrogio, Milan, Italy
| | - Andrea Morlacchi
- University of Insubria Day and Week Surgery Unit, General Surgery Department, Center of Research on the Pathology and High Specialization on the Abdominal Wall and Hernia Surgery, Milano Hernia Center, Istituto Clinico Sant'Ambrogio, Milan, Italy
| | - Francesca Lombardo
- University of Insubria Day and Week Surgery Unit, General Surgery Department, Center of Research on the Pathology and High Specialization on the Abdominal Wall and Hernia Surgery, Milano Hernia Center, Istituto Clinico Sant'Ambrogio, Milan, Italy
| | - Marta Cavalli
- University of Insubria Day and Week Surgery Unit, General Surgery Department, Center of Research on the Pathology and High Specialization on the Abdominal Wall and Hernia Surgery, Milano Hernia Center, Istituto Clinico Sant'Ambrogio, Milan, Italy
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Fornell J, Soriano J, Guerrero M, Sirvent JDD, Ferran-Marqués M, Ibáñez E, Barrios L, Baró MD, Suriñach S, Nogués C, Sort J, Pellicer E. Biodegradable FeMnSi Sputter-Coated Macroporous Polypropylene Membranes for the Sustained Release of Drugs. NANOMATERIALS (BASEL, SWITZERLAND) 2017; 7:E155. [PMID: 28672792 PMCID: PMC5535221 DOI: 10.3390/nano7070155] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/06/2017] [Revised: 06/21/2017] [Accepted: 06/22/2017] [Indexed: 11/16/2022]
Abstract
Pure Fe and FeMnSi thin films were sputtered on macroporous polypropylene (PP) membranes with the aim to obtain biocompatible, biodegradable and, eventually, magnetically-steerable platforms. Room-temperature ferromagnetic response was observed in both Fe- and FeMnSi-coated membranes. Good cell viability was observed in both cases by means of cytotoxicity studies, though the FeMnSi-coated membranes showed higher biodegradability than the Fe-coated ones. Various strategies to functionalize the porous platforms with transferrin-Alexa Fluor 488 (Tf-AF488) molecules were tested to determine an optimal balance between the functionalization yield and the cargo release. The distribution of Tf-AF488 within the FeMnSi-coated PP membranes, as well as its release and uptake by cells, was studied by confocal laser scanning microscopy. A homogeneous distribution of the drug within the membrane skeleton and its sustained release was achieved after three consecutive impregnations followed by the addition of a layer made of gelatin and maltodextrin, which prevented exceedingly fast release. The here-prepared organic-inorganic macroporous membranes could find applications as fixed or magnetically-steerable drug delivery platforms.
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Affiliation(s)
- Jordina Fornell
- Departament de Física, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Cerdanyola del Vallès, Spain.
| | - Jorge Soriano
- Departament de Biologia Cel·lular, Fisiologia i Immunologia, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Cerdanyola del Vallès, Spain.
| | - Miguel Guerrero
- Departament de Física, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Cerdanyola del Vallès, Spain.
| | - Juan de Dios Sirvent
- Departament de Física, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Cerdanyola del Vallès, Spain.
| | - Marta Ferran-Marqués
- Departament de Física, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Cerdanyola del Vallès, Spain.
| | - Elena Ibáñez
- Departament de Biologia Cel·lular, Fisiologia i Immunologia, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Cerdanyola del Vallès, Spain.
| | - Leonardo Barrios
- Departament de Biologia Cel·lular, Fisiologia i Immunologia, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Cerdanyola del Vallès, Spain.
| | - Maria Dolors Baró
- Departament de Física, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Cerdanyola del Vallès, Spain.
| | - Santiago Suriñach
- Departament de Física, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Cerdanyola del Vallès, Spain.
| | - Carme Nogués
- Departament de Biologia Cel·lular, Fisiologia i Immunologia, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Cerdanyola del Vallès, Spain.
| | - Jordi Sort
- Departament de Física, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Cerdanyola del Vallès, Spain.
- Institució Catalana de Recerca i Estudis Avançats (ICREA), Pg. Lluís Companys 23, E-08010 Barcelona, Spain.
| | - Eva Pellicer
- Departament de Física, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Cerdanyola del Vallès, Spain.
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Talley AD, Rogers BR, Iakovlev V, Dunn RF, Guelcher SA. Oxidation and degradation of polypropylene transvaginal mesh. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2017; 28:444-458. [PMID: 28081670 DOI: 10.1080/09205063.2017.1279045] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Polypropylene (PP) transvaginal mesh (TVM) repair for stress urinary incontinence (SUI) has shown promising short-term objective cure rates. However, life-altering complications have been associated with the placement of PP mesh for SUI repair. PP degradation as a result of the foreign body reaction (FBR) has been proposed as a contributing factor to mesh complications. We hypothesized that PP oxidizes under in vitro conditions simulating the FBR, resulting in degradation of the PP. Three PP mid-urethral slings from two commercial manufacturers were evaluated. Test specimens (n = 6) were incubated in oxidative medium for up to 5 weeks. Oxidation was assessed by Fourier Transform Infrared Spectroscopy (FTIR), and degradation was evaluated by scanning electron microscopy (SEM). FTIR spectra of the slings revealed evidence of carbonyl and hydroxyl peaks after 5 weeks of incubation time, providing evidence of oxidation of PP. SEM images at 5 weeks showed evidence of surface degradation, including pitting and flaking. Thus, oxidation and degradation of PP pelvic mesh were evidenced by chemical and physical changes under simulated in vivo conditions. To assess changes in PP surface chemistry in vivo, fibers were recovered from PP mesh explanted from a single patient without formalin fixation, untreated (n = 5) or scraped (n = 5) to remove tissue, and analyzed by X-ray photoelectron spectroscopy. Mechanical scraping removed adherent tissue, revealing an underlying layer of oxidized PP. These findings underscore the need for further research into the relative contribution of oxidative degradation to complications associated with PP-based TVM devices in larger cohorts of patients.
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Affiliation(s)
- Anne D Talley
- a Department of Chemical and Biomolecular Engineering , Vanderbilt University , Nashville , TN , USA
| | - Bridget R Rogers
- a Department of Chemical and Biomolecular Engineering , Vanderbilt University , Nashville , TN , USA
| | - Vladimir Iakovlev
- b Laboratory Medicine and Pathobiology , University of Toronto , Toronto , Canada.,c Division of Pathology and Keenan Research Centre of the Li Ka Shing Knowledge Institute , St. Michael's Hospital , Toronto , Canada
| | - Russell F Dunn
- a Department of Chemical and Biomolecular Engineering , Vanderbilt University , Nashville , TN , USA.,d Polymer and Chemical Technologies, LLC , Nashville , TN , USA
| | - Scott A Guelcher
- a Department of Chemical and Biomolecular Engineering , Vanderbilt University , Nashville , TN , USA.,e Department of Biomedical Engineering , Vanderbilt University , Nashville , TN , USA.,f Center for Bone Biology , Vanderbilt University , Nashville , TN , USA
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Reply to “In vivo polypropylene mesh degradation is hardly a myth”. Int Urogynecol J 2016; 28:337-338. [DOI: 10.1007/s00192-016-3237-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2016] [Accepted: 12/05/2016] [Indexed: 11/28/2022]
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In vivo polypropylene mesh degradation is hardly a myth. Int Urogynecol J 2016; 28:333-335. [DOI: 10.1007/s00192-016-3233-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2016] [Accepted: 12/05/2016] [Indexed: 10/20/2022]
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Thames SF, White JB, Ong KL. The myth: in vivo degradation of polypropylene-based meshes. Int Urogynecol J 2016; 28:285-297. [DOI: 10.1007/s00192-016-3131-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2016] [Accepted: 08/18/2016] [Indexed: 11/25/2022]
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Bendavid R. Re: Recurrence of inguinal hernias repaired in a large surgical specialty hospital and general hospitals in Ontario, Canada. Can J Surg 2016; 59:E3. [PMID: 26812414 DOI: 10.1503/cjs.017715] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Affiliation(s)
- Robert Bendavid
- From the Department of Surgery, Shouldice Hospital & University of Toronto, Thornhill, Ontario
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Physical Characteristics of Medical Textile Prostheses Designed for Hernia Repair: A Comprehensive Analysis of Select Commercial Devices. MATERIALS 2015; 8:8148-8168. [PMID: 28793704 PMCID: PMC5458830 DOI: 10.3390/ma8125453] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/15/2015] [Revised: 11/17/2015] [Accepted: 11/25/2015] [Indexed: 01/25/2023]
Abstract
Inguinal hernia repairs are among the most frequent operations performed worldwide. This study aims to provide further understanding of structural characteristics of hernia prostheses, and better comprehensive evaluation. Weight, porosity, pore size and other physical characteristics were evaluated; warp knitting structures were thoroughly discussed. Two methods referring to ISO 7198:1998, i.e., weight method and area method, were employed to calculate porosity. Porosity ranged from 37.3% to 69.7% measured by the area method, and 81.1% to 89.6% by the weight method. Devices with two-guide bar structures displayed both higher porosity (57.7%–69.7%) and effective porosity (30.8%–60.1%) than single-guide bar structure (37.3%–62.4% and 0%–5.9%, respectively). Filament diameter, stitch density and loop structure combined determined the thickness, weight and characteristics of pores. They must be well designed to avoid zero effective porosity regarding a single-bar structure. The area method was more effective in characterizing flat sheet meshes while the weight method was perhaps more accurate in describing stereoscopic void space for 3D structure devices. This article will give instructive clues for engineers to improve mesh structures, and better understanding of warp knitting meshes for surgeons.
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