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von Witzleben M, Stoppe T, Zeinalova A, Chen Z, Ahlfeld T, Bornitz M, Bernhardt A, Neudert M, Gelinsky M. Multimodal additive manufacturing of biomimetic tympanic membrane replacements with near tissue-like acousto-mechanical and biological properties. Acta Biomater 2023; 170:124-141. [PMID: 37696412 DOI: 10.1016/j.actbio.2023.09.005] [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: 04/04/2023] [Revised: 08/08/2023] [Accepted: 09/05/2023] [Indexed: 09/13/2023]
Abstract
The three additive manufacturing techniques fused deposition modeling, gel plotting and melt electrowriting were combined to develop a mimicry of the tympanic membrane (TM) to tackle large TM perforations caused by chronic otitis media. The mimicry of the collagen fiber orientation of the TM was accompanied by a study of multiple funnel-shaped mimics of the TM morphology, resulting in mechanical and acoustic properties similar to those of the eardrum. For the different 3D printing techniques used, the process parameters were optimized to allow reasonable microfiber arrangements within the melt electrowriting setup. Interestingly, the fiber pattern was less important for the acousto-mechanical properties than the overall morphology. Furthermore, the behavior of keratinocytes and fibroblasts is crucial for the repair of the TM, and an in vitro study showed a high biocompatibility of both primary cell types while mimicking the respective cell layers of the TM. A simulation of the in vivo ingrowth of both cell types resulted in a cell growth orientation similar to the original collagen fiber orientation of the TM. Overall, the combined approach showed all the necessary parameters to support the growth of a neo-epithelial layer with a similar structure and morphology to the original membrane. It therefore offers a suitable alternative to autologous materials for the treatment of chronic otitis media. STATEMENT OF SIGNIFICANCE: Millions of people worldwide suffer from chronic middle ear infections. Although the tympanic membrane (TM) can be reconstructed with autologous materials, the grafts used for this purpose require extensive manual preparation during surgery. This affects not only the hearing ability but also the stability of the reconstructed TM, especially in the case of full TM reconstruction. The synthetic alternative presented here mimicked not only the fibrous structure of the TM but also its morphology, resulting in similar acousto-mechanical properties. Furthermore, its high biocompatibility supported the migration of keratinocytes and fibroblasts to form a neo-epithelial layer. Overall, this completely new TM replacement was achieved by combining three different additive manufacturing processes.
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Affiliation(s)
- Max von Witzleben
- Technische Universität Dresden, Faculty of Medicine Carl Gustav Dresden, Centre for Translational Bone, Joint and Soft Tissue Research, Fetscherstr. 74, 01307 Dresden, Germany
| | - Thomas Stoppe
- Technische Universität Dresden, Faculty of Medicine Carl Gustav Carus, Department of Otorhinolaryngology, Head and Neck Surgery, Ear Research Center Dresden (ERCD), Fetscherstr. 74, 01307 Dresden, Germany
| | - Alina Zeinalova
- Technische Universität Dresden, Faculty of Medicine Carl Gustav Dresden, Centre for Translational Bone, Joint and Soft Tissue Research, Fetscherstr. 74, 01307 Dresden, Germany
| | - Zhaoyu Chen
- Technische Universität Dresden, Faculty of Medicine Carl Gustav Carus, Department of Otorhinolaryngology, Head and Neck Surgery, Ear Research Center Dresden (ERCD), Fetscherstr. 74, 01307 Dresden, Germany
| | - Tilman Ahlfeld
- Technische Universität Dresden, Faculty of Medicine Carl Gustav Dresden, Centre for Translational Bone, Joint and Soft Tissue Research, Fetscherstr. 74, 01307 Dresden, Germany
| | - Matthias Bornitz
- Technische Universität Dresden, Faculty of Medicine Carl Gustav Carus, Department of Otorhinolaryngology, Head and Neck Surgery, Ear Research Center Dresden (ERCD), Fetscherstr. 74, 01307 Dresden, Germany
| | - Anne Bernhardt
- Technische Universität Dresden, Faculty of Medicine Carl Gustav Dresden, Centre for Translational Bone, Joint and Soft Tissue Research, Fetscherstr. 74, 01307 Dresden, Germany
| | - Marcus Neudert
- Technische Universität Dresden, Faculty of Medicine Carl Gustav Carus, Department of Otorhinolaryngology, Head and Neck Surgery, Ear Research Center Dresden (ERCD), Fetscherstr. 74, 01307 Dresden, Germany
| | - Michael Gelinsky
- Technische Universität Dresden, Faculty of Medicine Carl Gustav Dresden, Centre for Translational Bone, Joint and Soft Tissue Research, Fetscherstr. 74, 01307 Dresden, Germany.
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Wei M, Bu X, Wang G, Zhen Y, Yang X, Li D, An Y. Expanded forehead flap in Asian nasal reconstruction. Sci Rep 2023; 13:5496. [PMID: 37015929 PMCID: PMC10071462 DOI: 10.1038/s41598-023-30245-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Accepted: 02/20/2023] [Indexed: 04/06/2023] Open
Abstract
This article reviewed our experience of Chinese nasal reconstruction over 12 years and evaluated the effect of expanded forehead flap both aesthetically and functionally. The special skin type and other anatomic features of Chinese patients was understood thoroughly during the treatment. This article thus catered for the need of multiracial nasal reconstruction. We analyzed existing clinical data and demonstrated a typical case in detail. The postoperative result supported our strategy which advocated the extensive application of expanded forehead flap, together with flip scar flap as the internal lining. The features of Chinese patients also prompted the use of costal and auricular cartilage. Emerging technology like 3D-printing would benefit nasal reconstruction from more aspects.
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Affiliation(s)
- Muqian Wei
- Department of Plastic Surgery, Peking University Third Hospital, 49 North Garden Road, Haidian District, Beijing, 100191, China
| | - Xi Bu
- Department of Plastic Surgery, Peking University Third Hospital, 49 North Garden Road, Haidian District, Beijing, 100191, China
| | - Guanhuier Wang
- Department of Plastic Surgery, Peking University Third Hospital, 49 North Garden Road, Haidian District, Beijing, 100191, China
| | - Yonghuan Zhen
- Department of Plastic Surgery, Peking University Third Hospital, 49 North Garden Road, Haidian District, Beijing, 100191, China
| | - Xin Yang
- Department of Plastic Surgery, Peking University Third Hospital, 49 North Garden Road, Haidian District, Beijing, 100191, China
| | - Dong Li
- Department of Plastic Surgery, Peking University Third Hospital, 49 North Garden Road, Haidian District, Beijing, 100191, China
| | - Yang An
- Department of Plastic Surgery, Peking University Third Hospital, 49 North Garden Road, Haidian District, Beijing, 100191, China.
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Wu S, Liu J, Cai J, Zhao J, Duan B, Chen S. Combining electrospinning with hot drawing process to fabricate high performance poly (L-lactic acid) nanofiber yarns for advanced nanostructured bio-textiles. Biofabrication 2021; 13. [PMID: 34450602 DOI: 10.1088/1758-5090/ac2209] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2021] [Accepted: 08/27/2021] [Indexed: 11/11/2022]
Abstract
Fiber constructed yarns are the elementary building blocks for the generation of implantable biotextiles, and there are always needs for designing and developing new types of yarns to improve the properties of biotextile implants. In the present study, we aim to develop novel nanofiber yarns (NYs) by combining nanostructure that more closely mimic the extracellular matrix fibrils of native tissues with biodegradability, strong mechanical properties and great textile processibility. A novel electrospinning system which integrates yarn formation with hot drawing process was developed to fabricate poly(L-lactic acid) (PLLA) NYs. Compared to the PLLA NYs without hot drawing, the thermally drawn PLLA NYs presented superbly-orientated fibrous structure and notably enhanced crystallinity. Importantly, they possessed admirable mechanical performances, which matched and even exceeded the commercial PLLA microfiber yarns (MYs). The thermally drawn PLLA NYs were also demonstrated to notably promote the adhesion, alignment, proliferation, and tenogenic differentiation of human adipose derived mesenchymal stem cells (hADMSCs) compared to the PLLA NYs without hot drawing. The thermally drawn PLLA NYs were further processed into various nanofibrous tissue scaffolds with defined structures and adjustable mechanical and biological properties using textile braiding and weaving technologies, demonstrating the feasibility and versatility of thermally drawn PLLA NYs for textile-forming utilization. The hADMSCs cultured on PLLA NY-based textiles presented enhanced attachment and proliferation capacities than those cultured on PLLA MY-based textiles. This work presents a facile technique to manufacture high performance PLLA NYs, which opens up opportunities to generate advanced nanostructured biotextiles for surgical implant applications.
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Affiliation(s)
- Shaohua Wu
- College of Textiles & Clothing, Qingdao University, Qingdao, People's Republic of China
| | - Jiao Liu
- College of Textiles & Clothing, Qingdao University, Qingdao, People's Republic of China
| | - Jiangyu Cai
- Department of Sports Medicine, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, People's Republic of China
| | - Jinzhong Zhao
- Department of Sports Medicine, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, People's Republic of China
| | - Bin Duan
- Mary & Dick Holland Regenerative Medicine Program and Division of Cardiology, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE, United States of America.,Department of Surgery, College of Medicine, University of Nebraska Medical Center, Omaha, NE, United States of America.,Department of Mechanical and Materials Engineering, University of Nebraska-Lincoln, Lincoln, NE, United States of America
| | - Shaojuan Chen
- College of Textiles & Clothing, Qingdao University, Qingdao, People's Republic of China
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