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Ribaudo JG, He K, Madira S, Young ER, Martin C, Lu T, Sacks JM, Li X. Sutureless vascular anastomotic approaches and their potential impacts. Bioact Mater 2024; 38:73-94. [PMID: 38699240 PMCID: PMC11061647 DOI: 10.1016/j.bioactmat.2024.04.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2024] [Revised: 03/25/2024] [Accepted: 04/04/2024] [Indexed: 05/05/2024] Open
Abstract
Sutureless anastomotic devices present several advantages over traditional suture anastomosis, including expanded global access to microvascular surgery, shorter operation and ischemic times, and reduced costs. However, their adaptation for arterial use remains a challenge. This review aims to provide a comprehensive overview of sutureless anastomotic approaches that are either FDA-approved or under investigation. These approaches include extraluminal couplers, intraluminal devices, and methods assisted by lasers or vacuums, with a particular emphasis on tissue adhesives. We analyze these devices for artery compatibility, material composition, potential for intimal damage, risks of thrombosis and restenosis, and complications arising from their deployment and maintenance. Additionally, we discuss the challenges faced in the development and clinical application of sutureless anastomotic techniques. Ideally, a sutureless anastomotic device or technique should eliminate the need for vessel eversion, mitigate thrombosis through either biodegradation or the release of antithrombotic drugs, and be easily deployable for broad use. The transformative potential of sutureless anastomotic approaches in microvascular surgery highlights the necessity for ongoing innovation to expand their applications and maximize their benefits.
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Affiliation(s)
- Joseph G. Ribaudo
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Washington University in St. Louis, MO, 63110, USA
| | - Kevin He
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Washington University in St. Louis, MO, 63110, USA
| | - Sarah Madira
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Washington University in St. Louis, MO, 63110, USA
| | - Emma R. Young
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Washington University in St. Louis, MO, 63110, USA
| | - Cameron Martin
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Washington University in St. Louis, MO, 63110, USA
| | - Tingying Lu
- Department of Plastic Surgery, Johns Hopkins School of Medicine, Baltimore, MD, 21287, USA
| | - Justin M. Sacks
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Washington University in St. Louis, MO, 63110, USA
| | - Xiaowei Li
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Washington University in St. Louis, MO, 63110, USA
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Heitzer M, Kilic K, Merfort R, Winnand P, Emonts C, Bock A, Ooms M, Steiner T, Hölzle F, Modabber A. Tensile strength of adhesives in peripheral nerve anastomoses: an in vitro biomechanical evaluation of four different neurorrhaphies. Eur J Med Res 2024; 29:264. [PMID: 38698476 PMCID: PMC11067280 DOI: 10.1186/s40001-024-01858-9] [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: 01/08/2023] [Accepted: 04/24/2024] [Indexed: 05/05/2024] Open
Abstract
BACKGROUND The fundamental prerequisite for prognostically favorable postoperative results of peripheral nerve repair is stable neurorrhaphy without interruption and gap formation. METHODS This study evaluates 60 neurorrhaphies on femoral chicken nerves in terms of the procedure and the biomechanical properties. Sutured neurorrhaphies (n = 15) served as control and three sutureless adhesive-based nerve repair techniques: Fibrin glue (n = 15), Histoacryl glue (n = 15), and the novel polyurethane adhesive VIVO (n = 15). Tensile and elongation tests of neurorrhaphies were performed on a tensile testing machine at a displacement rate of 20 mm/min until failure. The maximum tensile force and elongation were recorded. RESULTS All adhesive-based neurorrhaphies were significant faster in preparation compared to sutured anastomoses (p < 0.001). Neurorrhaphies by sutured (102.8 [cN]; p < 0.001), Histoacryl (91.5 [cN]; p < 0.001) and VIVO (45.47 [cN]; p < 0.05) withstood significant higher longitudinal tensile forces compared to fibrin glue (10.55 [cN]). VIVO, with △L/L0 of 6.96 [%], showed significantly higher elongation (p < 0.001) compared to neurorrhaphy using fibrin glue. CONCLUSION Within the limitations of an in vitro study the adhesive-based neurorrhaphy technique with VIVO and Histoacryl have the biomechanical potential to offer alternatives to sutured neuroanastomosis because of their stability, and faster handling. Further in vivo studies are required to evaluate functional outcomes and confirm safety.
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Affiliation(s)
- Marius Heitzer
- Department of Oral and Maxillofacial Surgery, University Hospital of RWTH Aachen, Pauwelsstraße 13, 52074, Aachen, Germany.
| | - Konrad Kilic
- Department of Oral and Maxillofacial Surgery, University Hospital of RWTH Aachen, Pauwelsstraße 13, 52074, Aachen, Germany
| | - Ricarda Merfort
- Department of Orthopedics, Trauma and Reconstructive Surgery, University Hospital of RWTH Aachen, Aachen, Germany
| | - Philipp Winnand
- Department of Oral and Maxillofacial Surgery, University Hospital of RWTH Aachen, Pauwelsstraße 13, 52074, Aachen, Germany
| | - Caroline Emonts
- Institute of Textile Technology, RWTH Aachen University, Otto-Blumenthal-Straße 1, 52074, Aachen, Germany
| | - Anna Bock
- Department of Oral and Maxillofacial Surgery, University Hospital of RWTH Aachen, Pauwelsstraße 13, 52074, Aachen, Germany
| | - Mark Ooms
- Department of Oral and Maxillofacial Surgery, University Hospital of RWTH Aachen, Pauwelsstraße 13, 52074, Aachen, Germany
| | - Timm Steiner
- Department of Oral and Maxillofacial Surgery, University Hospital of RWTH Aachen, Pauwelsstraße 13, 52074, Aachen, Germany
| | - Frank Hölzle
- Department of Oral and Maxillofacial Surgery, University Hospital of RWTH Aachen, Pauwelsstraße 13, 52074, Aachen, Germany
| | - Ali Modabber
- Department of Oral and Maxillofacial Surgery, University Hospital of RWTH Aachen, Pauwelsstraße 13, 52074, Aachen, Germany
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Heitzer M, Winnand P, Ooms M, Magnuska Z, Kiessling F, Buhl EM, Hölzle F, Modabber A. A Biodegradable Tissue Adhesive for Post-Extraction Alveolar Bone Regeneration under Ongoing Anticoagulation-A Microstructural Volumetric Analysis in a Rodent Model. Int J Mol Sci 2024; 25:4210. [PMID: 38673796 PMCID: PMC11049800 DOI: 10.3390/ijms25084210] [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: 03/12/2024] [Revised: 04/04/2024] [Accepted: 04/09/2024] [Indexed: 04/28/2024] Open
Abstract
In addition to post-extraction bleeding, pronounced alveolar bone resorption is a very common complication after tooth extraction in patients undergoing anticoagulation therapy. The novel, biodegenerative, polyurethane adhesive VIVO has shown a positive effect on soft tissue regeneration and hemostasis. However, the regenerative potential of VIVO in terms of bone regeneration has not yet been explored. The present rodent study compared the post-extraction bone healing of a collagen sponge (COSP) and VIVO in the context of ongoing anticoagulation therapy. According to a split-mouth design, a total of 178 extraction sockets were generated under rivaroxaban treatment, of which 89 extraction sockets were treated with VIVO and 89 with COSP. Post-extraction bone analysis was conducted via in vivo micro-computed tomography (µCT), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDX) after 5, 10, and 90 days. During the observation time of 90 days, µCT analysis revealed that VIVO and COSP led to significant increases in both bone volume and bone density (p ≤ 0.001). SEM images of the extraction sockets treated with either VIVO or COSP showed bone regeneration in the form of lamellar bone mass. Ratios of Ca/C and Ca/P observed via EDX indicated newly formed bone matrixes in both treatments after 90 days. There were no statistical differences between treatment with VIVO or COSP. The hemostatic agents VIVO and COSP were both able to prevent pronounced bone loss, and both demonstrated a strong positive influence on the bone regeneration of the alveolar ridge post-extraction.
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Affiliation(s)
- Marius Heitzer
- Department of Oral and Maxillofacial Surgery, University Hospital RWTH Aachen, Pauwelstraße 30, 52074 Aachen, Germany (M.O.)
| | - Philipp Winnand
- Department of Oral and Maxillofacial Surgery, University Hospital RWTH Aachen, Pauwelstraße 30, 52074 Aachen, Germany (M.O.)
| | - Mark Ooms
- Department of Oral and Maxillofacial Surgery, University Hospital RWTH Aachen, Pauwelstraße 30, 52074 Aachen, Germany (M.O.)
| | - Zuzanna Magnuska
- Institute for Experimental Molecular Imaging, RWTH Aachen University, Forckenbeckstraße 55, 52074 Aachen, Germany; (Z.M.)
| | - Fabian Kiessling
- Institute for Experimental Molecular Imaging, RWTH Aachen University, Forckenbeckstraße 55, 52074 Aachen, Germany; (Z.M.)
| | - Eva Miriam Buhl
- Institute for Pathology, Electron Microscopy Facility, University Hospital RWTH Aachen, Pauwelstraße 30, 52074 Aachen, Germany
| | - Frank Hölzle
- Department of Oral and Maxillofacial Surgery, University Hospital RWTH Aachen, Pauwelstraße 30, 52074 Aachen, Germany (M.O.)
| | - Ali Modabber
- Department of Oral and Maxillofacial Surgery, University Hospital RWTH Aachen, Pauwelstraße 30, 52074 Aachen, Germany (M.O.)
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Heitzer M, Kilic K, Merfort R, Emonts C, Winnand P, Kniha K, Hölzle F, Modabber A. Evaluation of fibrin, cyanoacrylate, and polyurethane-based tissue adhesives in sutureless vascular anastomosis: a comparative mechanical ex vivo study. Int J Oral Maxillofac Surg 2023; 52:1137-1144. [PMID: 37019734 DOI: 10.1016/j.ijom.2023.03.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2022] [Revised: 03/18/2023] [Accepted: 03/21/2023] [Indexed: 04/05/2023]
Abstract
The stability of a microvascular anastomosis is an important prerequisite for successful tissue transfer. Advances in tissue adhesives are potentially opening new avenues for their use in sutureless microsurgical anastomosis, however they have not yet gained clinical acceptance. In this ex vivo study, a novel polyurethane-based adhesive (PA) was used in sutureless anastomoses and its stability compared with that of sutureless anastomoses performed with fibrin glue (FG) and a cyanoacrylate (CA). Stability was assessed using hydrostatic (15 per group) and mechanical tests (13 per group). A total of 84 chicken femoral arteries were used in this study. The time taken to create the PA and CA anastomoses was significantly faster when compared to the FG anastomoses (P < 0.001): 1.55 ± 0.14 min and 1.39 ± 0.06 min, respectively, compared to 2.03 ± 0.35 min. Both sustained significantly higher pressures (289.3 mmHg and 292.7 mmHg, respectively) than anastomoses using FG (137.3 mmHg) (P < 0.001). CA anastomoses (0.99 N; P < 0.001) and PA anastomoses (0.38 N; P = 0.009) could both withstand significantly higher longitudinal tensile forces compared to FG anastomoses (0.10 N). Considering the background of an in vitro study, the PA and CA anastomosis techniques were shown to be similar to each other and superior to FG, due to their stability and faster handling. These findings need to be validated and confirmed in further in vivo studies.
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Affiliation(s)
- M Heitzer
- Department of Oral and Maxillofacial Surgery, University Hospital of RWTH Aachen, Aachen, Germany.
| | - K Kilic
- Department of Oral and Maxillofacial Surgery, University Hospital of RWTH Aachen, Aachen, Germany
| | - R Merfort
- Department of Orthopaedics, Trauma and Reconstructive Surgery, University Hospital of RWTH Aachen, Aachen, Germany
| | - C Emonts
- Institut für Textiltechnik, RWTH Aachen University, Aachen, Germany
| | - P Winnand
- Department of Oral and Maxillofacial Surgery, University Hospital of RWTH Aachen, Aachen, Germany
| | - K Kniha
- Department of Oral and Maxillofacial Surgery, University Hospital of RWTH Aachen, Aachen, Germany
| | - F Hölzle
- Department of Oral and Maxillofacial Surgery, University Hospital of RWTH Aachen, Aachen, Germany
| | - A Modabber
- Department of Oral and Maxillofacial Surgery, University Hospital of RWTH Aachen, Aachen, Germany
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Fitzgerald DM, Colson YL, Grinstaff MW. Synthetic Pressure Sensitive Adhesives for Biomedical Applications. Prog Polym Sci 2023; 142:101692. [PMID: 37273788 PMCID: PMC10237363 DOI: 10.1016/j.progpolymsci.2023.101692] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Pressure sensitive adhesives are components of everyday products found in homes, offices, industries, and hospitals. Serving the general purpose of fissure repair and object fixation, pressure sensitive adhesives indiscriminately bind surfaces, as long as contact pressure is administered at application. With that being said, the chemical and material properties of the adhesive formulation define the strength of a pressure sensitive adhesive to a particular surface. Given our increased understanding of the viscoelastic material requirements as well as the intermolecular interactions at the binding interface required for functional adhesives, pressure sensitive adhesives are now being explored for greater use. New polymer formulations impart functionality and degradability for both internal and external applications. This review highlights the structure-property relationships between polymer architecture and pressure sensitive adhesion, specifically for medicine. We discuss the rational, molecular-level design of synthetic polymers for durable, removable, and biocompatible adhesion to wet surfaces like tissue. Finally, we examine prevalent challenges in biomedical wound closure and the new, innovative strategies being employed to address them. We conclude by summarizing the progress of current research, identifying additional clinical opportunities, and discussing future prospects.
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Affiliation(s)
- Danielle M. Fitzgerald
- Department of Chemistry, Biomedical Engineering, and Medicine, Boston University, Boston, MA 02115
| | - Yolonda L. Colson
- Division of Thoracic Surgery, Department of Surgery, Massachusetts General Hospital, Boston, MA 02214
| | - Mark W. Grinstaff
- Department of Chemistry, Biomedical Engineering, and Medicine, Boston University, Boston, MA 02115
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Heitzer M, Winnand P, Bock A, Ooms M, Katz MS, Kniha K, Grottke O, Hölzle F, Modabber A. Evaluation of the Hemostatic Effect of an Innovative Tissue Adhesive during Extraction Therapy under Rivaroxaban in a Rodent Model. J Funct Biomater 2023; 14:333. [PMID: 37504828 PMCID: PMC10381264 DOI: 10.3390/jfb14070333] [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: 05/21/2023] [Revised: 06/18/2023] [Accepted: 06/19/2023] [Indexed: 07/29/2023] Open
Abstract
An increase in rivaroxaban therapies is associated with increased numbers of postoperative bleeding despite the use of hemostatic sponges, which are currently the gold standard treatment. VIVO has shown promising hemostatic results, favorable tissue properties, and ease of application, although it has not yet been used in the oral cavity. The aim of this study was to evaluate the hemostatic properties of VIVO in the extraction sockets of 31 rodents and compare this to gelatin sponge (GSP) therapy. At rivaroxaban concentrations of 264.10 ± 250.10 ng/mL, 62 extraction sockets were generated, of which 31 were treated with VIVO and 31 with GSP. The duration time, early and late bleeding events, and wound healing score were determined. Histologic examinations of the tissues were performed after 5 days. VIVO presented a longer procedure, 1.26 ± 0.06 min, but a significantly shorter bleeding time, 0.14 ± 0.03 min. There was no difference between the two groups in terms of the severity and timing of bleeding. More minor early bleeding events were observed for GSP. VIVO showed a significantly better healing score, with favorable histological results. In an animal study, VIVO showed promising hemostatic properties after tooth extraction under ongoing anticoagulative therapy.
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Affiliation(s)
- Marius Heitzer
- Department of Oral and Cranio-Maxillofacial Surgery, University Hospital RWTH Aachen, Pauwelstraße 30, 52074 Aachen, Germany
| | - Philipp Winnand
- Department of Oral and Cranio-Maxillofacial Surgery, University Hospital RWTH Aachen, Pauwelstraße 30, 52074 Aachen, Germany
| | - Anna Bock
- Department of Oral and Cranio-Maxillofacial Surgery, University Hospital RWTH Aachen, Pauwelstraße 30, 52074 Aachen, Germany
| | - Mark Ooms
- Department of Oral and Cranio-Maxillofacial Surgery, University Hospital RWTH Aachen, Pauwelstraße 30, 52074 Aachen, Germany
| | - Marie Sophie Katz
- Department of Oral and Cranio-Maxillofacial Surgery, University Hospital RWTH Aachen, Pauwelstraße 30, 52074 Aachen, Germany
| | - Kristian Kniha
- Department of Oral and Cranio-Maxillofacial Surgery, University Hospital RWTH Aachen, Pauwelstraße 30, 52074 Aachen, Germany
| | - Oliver Grottke
- Clinic for Anesthesiology/Operative Intensive Care Medicine, University Hospital RWTH Aachen, Pauwelstraße 30, 52074 Aachen, Germany
| | - Frank Hölzle
- Department of Oral and Cranio-Maxillofacial Surgery, University Hospital RWTH Aachen, Pauwelstraße 30, 52074 Aachen, Germany
| | - Ali Modabber
- Department of Oral and Cranio-Maxillofacial Surgery, University Hospital RWTH Aachen, Pauwelstraße 30, 52074 Aachen, Germany
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Bremer L, Hagemeister K, Moss M, Ernst L, Tolba RH, Jockenhoevel S, Apel C. Long-Term Degradation Assessment of a Polyurethane-Based Surgical Adhesive-Assessment and Critical Consideration of Preclinical In Vitro and In Vivo Testing. J Funct Biomater 2023; 14:jfb14030168. [PMID: 36976092 PMCID: PMC10058192 DOI: 10.3390/jfb14030168] [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: 02/15/2023] [Revised: 03/08/2023] [Accepted: 03/18/2023] [Indexed: 03/29/2023] Open
Abstract
Tissue adhesives constitute a great possibility to improve conventional wound closure. In contrast to sutures, they enable nearly immediate hemostasis and can prevent fluid or air leaks. In the present study, a poly(ester)urethane-based adhesive was investigated which already proved to be suitable for different indications, such as reinforcing vascular anastomosis and sealing liver tissue. Using in vitro and in vivo setups, the degradation of the adhesives was monitored over a period of up to 2 years, to evaluate long-term biocompatibility and determine degradation kinetics. For the first time, the complete degradation of the adhesive was documented. In subcutaneous locations, tissue residues were found after 12 months and in intramuscular locations, tissue degradation was complete after about 6 months. A detailed histological evaluation of the local tissue reaction revealed good biocompatibility throughout the different degradation stages. After full degradation, complete remodeling to physiological tissue was observed at the implant locations. In addition, this study critically discusses common issues related to the assessment of biomaterial degradation kinetics in the context of medical device certification. This work highlighted the importance and encouraged the implementation of biologically relevant in vitro degradation models to replace animal studies or at least reduce the number of animals in preclinical testing prior to clinical studies. Moreover, the suitability of frequently used implantation studies based on ISO 10993-6 at standard locations was critically discussed, especially in light of the associated lack of reliable predictions for degradation kinetics at the clinically relevant site of implantation.
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Affiliation(s)
- Lisanne Bremer
- Department of Biohybrid & Medical Textiles, Institute of Applied Medical Engineering, Helmholtz Institute for Biomedical Engineering, RWTH Aachen University, 52074 Aachen, Germany
| | | | - Michaela Moss
- Institute for Laboratory Animal Science & Experimental Surgery, University Hospital RWTH Aachen, 52074 Aachen, Germany
| | - Lisa Ernst
- Institute for Laboratory Animal Science & Experimental Surgery, University Hospital RWTH Aachen, 52074 Aachen, Germany
| | - René H Tolba
- Institute for Laboratory Animal Science & Experimental Surgery, University Hospital RWTH Aachen, 52074 Aachen, Germany
| | - Stefan Jockenhoevel
- Department of Biohybrid & Medical Textiles, Institute of Applied Medical Engineering, Helmholtz Institute for Biomedical Engineering, RWTH Aachen University, 52074 Aachen, Germany
| | - Christian Apel
- Department of Biohybrid & Medical Textiles, Institute of Applied Medical Engineering, Helmholtz Institute for Biomedical Engineering, RWTH Aachen University, 52074 Aachen, Germany
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Mirzaei Y, Hagemeister K, Tolba RH, Steitz J. Novel In Vitro Study to Assess Microbial Barrier Properties of Polyurethane-Based Tissue Adhesives in Comparison to the Gold Standard Dermabond®. BIOMED RESEARCH INTERNATIONAL 2022; 2022:5249214. [PMID: 36303586 PMCID: PMC9596255 DOI: 10.1155/2022/5249214] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/04/2022] [Revised: 09/05/2022] [Accepted: 10/07/2022] [Indexed: 11/17/2022]
Abstract
Tissue adhesives as a physical barrier to microorganism penetration provide an alternative method with many advantages for wound closure in surgical settings compared to the clinical standard. This raises the need of developing and conducting in vitro methods that are sensitive and reproducible to assess their microbial barrier properties. In this study, three different polyurethane-based tissue adhesives with different physicochemical properties were evaluated in comparison to Dermabond® as a clinical gold standard for topical wound closure. Here, physicochemical properties varied in lactide concentration, viscosity, processing, and the full polymerization time. To evaluate the microbial barrier function, a 5 μl aliquot of E. coli Lux inoculum containing at least 1 × 109 CFU/ml was applied to the surface of each test adhesive and sterile filter paper as the control that was placed on an agar plate and incubated at 37°C. Plates were observed for bacterial growth (morphology), the adhesion of the adhesive/filter paper, and bioluminescence after 24, 48, and 72 hours. The data presented in this in vitro model indicated that polyurethane-based tissue adhesives with lactide concentration ≥ 5% provided a suitable barrier against microbial penetration with 95% confidence of 99% efficacy for 72 h along with Dermabond®. Interestingly, the here described method was able to discriminate between the different physicochemical properties showing a better microbial barrier function with increasing lactide concentration of the adhesive. Overall, the results of this study showed the noninferiority between Dermabond® and the two abovementioned polyurethane-based tissue adhesives.
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Affiliation(s)
- Yalda Mirzaei
- Institute for Laboratory Animal Science, Faculty of Medicine, RWTH Aachen University, Aachen, Germany
| | | | - René H. Tolba
- Institute for Laboratory Animal Science, Faculty of Medicine, RWTH Aachen University, Aachen, Germany
| | - Julia Steitz
- Institute for Laboratory Animal Science, Faculty of Medicine, RWTH Aachen University, Aachen, Germany
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