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Sergi PN. Some Mechanical Constraints to the Biomimicry with Peripheral Nerves. Biomimetics (Basel) 2023; 8:544. [PMID: 37999185 PMCID: PMC10669299 DOI: 10.3390/biomimetics8070544] [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: 08/08/2023] [Revised: 10/01/2023] [Accepted: 10/20/2023] [Indexed: 11/25/2023] Open
Abstract
Novel high technology devices built to restore impaired peripheral nerves should be biomimetic in both their structure and in the biomolecular environment created around regenerating axons. Nevertheless, the structural biomimicry with peripheral nerves should follow some basic constraints due to their complex mechanical behaviour. However, it is not currently clear how these constraints could be defined. As a consequence, in this work, an explicit, deterministic, and physical-based framework was proposed to describe some mechanical constraints needed to mimic the peripheral nerve behaviour in extension. More specifically, a novel framework was proposed to investigate whether the similarity of the stress/strain curve was enough to replicate the natural nerve behaviour. An original series of computational optimizing procedures was then introduced to further investigate the role of the tangent modulus and of the rate of change of the tangent modulus with strain in better defining the structural biomimicry with peripheral nerves.
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Affiliation(s)
- Pier Nicola Sergi
- Translational Neural Engineering Area, The Biorobotics Institute and Department of Excellence in Robotics and AI, Sant'Anna School of Advanced Studies, 56127 Pisa, Italy
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Zhang XP, He YT, Li WX, Chen BZ, Zhang CY, Cui Y, Guo XD. An update on biomaterials as microneedle matrixes for biomedical applications. J Mater Chem B 2022; 10:6059-6077. [PMID: 35916308 DOI: 10.1039/d2tb00905f] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Microneedles (MNs) have been developed for various applications such as drug delivery, cosmetics, diagnosis, and biosensing. To meet the requirements of MNs used in these areas, numerous materials have been used for the fabrication of MNs. However, MNs will be exposed to skin tissues after piercing the stratum corneum barrier. Thus, it is necessary to ensure that the matrix materials of MNs have the characteristics of low toxicity, good biocompatibility, biodegradability, and sufficient mechanical properties for clinical application. In this review, the matrix materials currently used for preparing MNs are summarized and reviewed in terms of these factors. In addition, MN products used on the market and their applications are summarized in the end. This work may provide some basic information to researchers in the selection of MN matrix materials and in developing new materials.
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Affiliation(s)
- Xiao Peng Zhang
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 10029, China.
- Beijing Laboratory of Biomedical Materials, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, P. R. China
| | - Yu Ting He
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 10029, China.
- Beijing Laboratory of Biomedical Materials, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, P. R. China
| | - Wen Xuan Li
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 10029, China.
- Beijing Laboratory of Biomedical Materials, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, P. R. China
| | - Bo Zhi Chen
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 10029, China.
- Beijing Laboratory of Biomedical Materials, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, P. R. China
| | - Can Yang Zhang
- Biopharmaceutical and Health Engineering Division, Tsinghua Shenzhen International Graduate School, Shenzhen, 518055, China.
| | - Yong Cui
- Department of Dermatology, China-Japan Friendship Hospital, East Street Cherry Park, Chaoyang District, Beijing, 100029, P. R. China.
| | - Xin Dong Guo
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 10029, China.
- Beijing Laboratory of Biomedical Materials, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, P. R. China
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Koppaka S, Hess-Dunning A, Tyler DJ. Biomechanical characterization of isolated epineurial and perineurial membranes of rabbit sciatic nerve. J Biomech 2022; 136:111058. [DOI: 10.1016/j.jbiomech.2022.111058] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2021] [Revised: 01/31/2022] [Accepted: 03/21/2022] [Indexed: 01/31/2023]
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Sergi PN, Valle JD, Oliva NDL, Micera S, Navarro X. A data-driven polynomial approach to reproduce the scar tissue outgrowth around neural implants. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2020; 31:59. [PMID: 32632521 DOI: 10.1007/s10856-020-06396-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2019] [Accepted: 06/23/2020] [Indexed: 06/11/2023]
Abstract
Despite the huge complexity of the foreign body reaction, a quantitative assessment over time of the scar tissue thickness around implanted materials is needed to figure out the evolution of neural implants for long times. A data-driven approach, based on phenomenological polynomial functions, is able to reproduce experimental data. Nevertheless, a misuse of this strategy may lead to unsatisfactory results, even if standard indexes are optimized. In this work, an effective in silico procedure was presented to reproduce the scar tissue dynamics around implanted synthetic devices and to predict the capsule thickness for times before and after experimental detections.
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Affiliation(s)
- Pier Nicola Sergi
- Translational Neural Engineering Area, The BioRobotics Institute, Sant'Anna School of Advanced Studies, PSV, 56025, Pontedera, Pisa, Italy.
| | - Jaume Del Valle
- Department of Cell Biology, Physiology and Immunology, Institute of Neurosciences, Universitat Autónoma de Barcellona, and Centro de Investigación Biomédica en Red en Enfermedades Neurodegenerativas (CIBERNED), Bellaterra, Spain
| | - Natalia de la Oliva
- Department of Cell Biology, Physiology and Immunology, Institute of Neurosciences, Universitat Autónoma de Barcellona, and Centro de Investigación Biomédica en Red en Enfermedades Neurodegenerativas (CIBERNED), Bellaterra, Spain
| | - Silvestro Micera
- Translational Neural Engineering Area, The BioRobotics Institute, Sant'Anna School of Advanced Studies, PSV, 56025, Pontedera, Pisa, Italy
- Bertarelli Foundation Chair in Translational Neuroengineering, Center for Neuroprosthetics and Institute of Bioengineering, School of Engineering, École Polytechnique Fédérale de Lausanne (EPFL), 1015, Lausanne, Switzerland
| | - Xavier Navarro
- Department of Cell Biology, Physiology and Immunology, Institute of Neurosciences, Universitat Autónoma de Barcellona, and Centro de Investigación Biomédica en Red en Enfermedades Neurodegenerativas (CIBERNED), Bellaterra, Spain
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Giannessi E, Stornelli MR, Sergi PN. Strain stiffening of peripheral nerves subjected to longitudinal extensions in vitro. Med Eng Phys 2019; 76:47-55. [PMID: 31882395 DOI: 10.1016/j.medengphy.2019.10.012] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2018] [Revised: 10/11/2019] [Accepted: 10/20/2019] [Indexed: 01/07/2023]
Abstract
The mechanical response of peripheral nerves is crucial to understand their physiological and pathological conditions. However, their response to external mechanical solicitations is still partially unclear, since peripheral nerves could behave in a quite complex way. In particular, nerves react to longitudinal strains increasing their stiffness to keep axons integrity and to preserve endoneural structures from overstretch. In this work, the strain stiffening of peripheral nerves was investigated in vitro through a recently introduced computational framework, which is able to theoretically reproduce the experimental behaviour of excised tibial and sciatic nerves. The evolution and the variation of the tangent modulus of tibial and sciatic nerve specimens were quantitatively investigated and compared to explore how stretched peripheral nerves change their instantaneous stiffness.
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Affiliation(s)
| | | | - Pier Nicola Sergi
- Translational Neural Engineering Area, The Biorobotics Institute, Sant'Anna School of Advanced Studies, PSV, 56025 Pontedera, Italy.
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A Quantitative Investigation on the Peripheral Nerve Response within the Small Strain Range. APPLIED SCIENCES-BASEL 2019. [DOI: 10.3390/app9061115] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Peripheral nerves are very complex biological structures crucial to linking the central nervous system to the periphery of the body. However, their real behaviour is partially unknown because of the intrinsic difficulty of studying these structures in vivo. As a consequence, theoretical and computational tools together with in vitro experiments are widely used to approximate the mechanical response of the peripheral nervous tissue to different kind of solicitations. More specifically, particular conditions narrow the mechanical response of peripheral nerves within the small strain regime. Therefore, in this work, the mechanical response of nerves was investigated through the study of the relationships among strain, stress and displacements within the small strain range. Theoretical predictions were quantitatively compared to experimental evidences, while the displacement field was studied for different values of the tissue compressibility. This framework provided a straightforward computational assessment of the nerve response, which was needed to design suitable connections to biomaterials or neural interfaces within the small strain range.
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Hwang D, Lim B, Jung HG, Ihn YS, Jeong J, Yim S, Oh SR, Kim K. A Pilot Study On The Novel Non-Invasive Nerve-Holder With Negative-Pressure Suctions. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2018; 2018:1789-1792. [PMID: 30440741 DOI: 10.1109/embc.2018.8512555] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
In performing neurosurgical operation on peripheral nervous system, the most important first step is to robustly hold the target nerve, since the nerve-holding stability and reliability significantly affect the result of surgical operation. However it is not straightforward to robustly hold peripheral nerve during the surgical operation, because the peripheral nerve is too flexible and slippery. In this study, we design a novel peripheral nerve-holder that can be used for the neurosurgical operation. Considering the anatomical characteristics of the peripheral nerve that small bundles of nerve fibers (i.e., fascicles) are structured inside the outermost layer of the nerve bundle (i.e., epineurium), we aim to develop a non-clamping and non-invasive type nerve-holder to protect the nerve fibers. For the aim, the negative-pressure suction method is applied to the proposed holder. And, in order to hold the nerve more robustly, micro-bump structure is fabricated on the suction surface contacting with the nerve. This paper introduces the concept, working principle, characteristics, and in-vitro experimental results on feasibility evaluation of the proposed holder.
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Needle-tissue interactive mechanism and steering control in image-guided robot-assisted minimally invasive surgery: a review. Med Biol Eng Comput 2018; 56:931-949. [DOI: 10.1007/s11517-018-1825-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2016] [Accepted: 03/27/2018] [Indexed: 12/19/2022]
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Fast in silico assessment of physical stress for peripheral nerves. Med Biol Eng Comput 2018; 56:1541-1551. [DOI: 10.1007/s11517-018-1794-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2017] [Accepted: 01/22/2018] [Indexed: 12/24/2022]
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Giannessi E, Stornelli MR, Sergi PN. A unified approach to model peripheral nerves across different animal species. PeerJ 2017; 5:e4005. [PMID: 29142788 PMCID: PMC5683050 DOI: 10.7717/peerj.4005] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2016] [Accepted: 10/18/2017] [Indexed: 12/05/2022] Open
Abstract
Peripheral nerves are extremely complex biological structures. The knowledge of their response to stretch is crucial to better understand physiological and pathological states (e.g., due to overstretch). Since their mechanical response is deterministically related to the nature of the external stimuli, theoretical and computational tools were used to investigate their behaviour. In this work, a Yeoh-like polynomial strain energy function was used to reproduce the response of in vitro porcine nerve. Moreover, this approach was applied to different nervous structures coming from different animal species (rabbit, lobster, Aplysia) and tested for different amount of stretch (up to extreme ones). Starting from this theoretical background, in silico models of both porcine nerves and cerebro-abdominal connective of Aplysia were built to reproduce experimental data (R2 > 0.9). Finally, bi-dimensional in silico models were provided to reduce computational time of more than 90% with respect to the performances of fully three-dimensional models.
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Affiliation(s)
| | | | - Pier Nicola Sergi
- Translational Neural Engineering Laboratory, The Biorobotics Institute, Sant'Anna School of Advanced Studies, Pontedera, Italy
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Sergi PN, Jensen W, Yoshida K. Interactions among biotic and abiotic factors affect the reliability of tungsten microneedles puncturing in vitro and in vivo peripheral nerves: A hybrid computational approach. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2016; 59:1089-1099. [DOI: 10.1016/j.msec.2015.11.022] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2015] [Revised: 10/28/2015] [Accepted: 11/08/2015] [Indexed: 01/05/2023]
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