1
|
Liang M, Song L, Gao Y, Feng W, Wang L, Fan Y. Structural optimization of degradable polymer vascular stents based on surrogate models. Comput Methods Biomech Biomed Engin 2024:1-11. [PMID: 38937925 DOI: 10.1080/10255842.2024.2370400] [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: 03/12/2024] [Accepted: 06/06/2024] [Indexed: 06/29/2024]
Abstract
The clinical performance of biodegradable polymer stents implanted in blood vessels is affected by uneven degradation. Stress distribution plays an important role in polymer degradation, and local stress concentration leads to the premature fracture of stents. Numerical simulations combined with in vitro experimental validation can accurately describe the degradation process and perform structural optimization. Compared with traditional design techniques, optimization based on surrogate models is more scientifically effective. Three stent structures were designed and optimized, with the effective working time during degradation as the optimization goal. The finite element method was employed to simulate the degradation process of the stent. Surrogate models were employed to establish the functional relationship between the design parameters and the degradation performance. The proposed function models accurately predicted the degradation performance of various stents. The optimized stent structures demonstrated improved degradation performance, with the kriging model showing a better optimization effect. This study provided a novel approach for optimizing the structural design of biodegradable polymer stents to enhance degradation performance.
Collapse
Affiliation(s)
- Mingkai Liang
- Key Laboratory of Biomechanics and Mechanobiology (Beihang University), Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
- Hangzhou International Innovation Institute, Beihang University, Hangzhou, China
| | - Lihua Song
- Key Laboratory of Biomechanics and Mechanobiology (Beihang University), Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Yuanming Gao
- Key Laboratory of Biomechanics and Mechanobiology (Beihang University), Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Wentao Feng
- Key Laboratory of Biomechanics and Mechanobiology (Beihang University), Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Lizhen Wang
- Key Laboratory of Biomechanics and Mechanobiology (Beihang University), Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
- Hangzhou International Innovation Institute, Beihang University, Hangzhou, China
| | - Yubo Fan
- Key Laboratory of Biomechanics and Mechanobiology (Beihang University), Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| |
Collapse
|
2
|
Li L, Zhu P, Li Q, Gao Y, Fan Y. Symmetrical structure design of PLGA Biodegradable sinus stents and structure optimization based on surrogate models. Comput Methods Biomech Biomed Engin 2024:1-10. [PMID: 38776383 DOI: 10.1080/10255842.2024.2355491] [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: 03/26/2024] [Accepted: 05/08/2024] [Indexed: 05/25/2024]
Abstract
This study aims to enhance the degradation uniformity of PLGA sinus stents to minimize fracture risk caused by stress corrosion. Symmetric stent structures were introduced and compared to sinusoidal structure in terms of stress and degradation uniformity during implantation and degradation processes. Three surrogate models were employed to optimize the honeycomb-like structure. Results showed honeycomb-like structures exhibited the superior stress distribution and highest degradation uniformity. The kriging model achieved the smallest error and degradation uniformity of 83.24%. In conclusion, enhancing the symmetry of stent structures improves degradation uniformity, and the kriging model has potential for the optimization of stent structures.
Collapse
Affiliation(s)
- Lingyan Li
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Peng Zhu
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Qiao Li
- School of Engineering Medicine, Beihang University, Beijing, China
| | - Yuanming Gao
- School of Engineering Medicine, Beihang University, Beijing, China
| | - Yubo Fan
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
- School of Engineering Medicine, Beihang University, Beijing, China
| |
Collapse
|
3
|
Liu Y, Xia B, Zhao R, Qin M, Weng X, Zeng Z, Deng K, Jiang H. Automatic in situ short-distance deposition of PLGA/PLLA composite nanofibrous membranes for personalized wound dressings. NANOSCALE 2024; 16:8546-8562. [PMID: 38596837 DOI: 10.1039/d3nr06376c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2024]
Abstract
Improving the mechanical properties of wound dressings and achieving personalized automatic real-time in situ deposition are important for accelerating wound management and repair. In this study, we report a self-designed automatic in situ deposition device based on solution blow spinning (SBS) to prepare poly(lactic-co-glycolic acid) (PLGA) and poly-L-lactic acid (PLLA) composite (PLGA/PLLA) nanofibrous membranes for wound dressing at a short distance. Polymer solution and in situ deposition conditions, including air pressure, spinning distance, solvent extrusion rate, and spinning rate, were optimized using orthogonal experiments and characterized via dynamic mechanical analysis. The microscopic morphology and physical properties of the prepared PLGA/PLLA composite nanofibrous membranes show that their strength, adhesion, water vapor transmission rate (WVTR), water retention, water absorption, degradation, and other properties were sufficient for wound-dressing applications. To investigate the possibility of a biomedical wound-dressing material, tannic acid (TA) was incorporated into the PLGA/PLLA composite nanofibrous membranes. The resultant PLGA/PLLA/TA composite nanofibrous membranes exhibited good biocompatibility and exceptional antibacterial properties against both Escherichia coli and Staphylococcus aureus. A pilot animal study illustrated the potential of this in situ deposition of PLGA/PLLA/TA composite nanofibrous membranes across multiple applications in wound healing/repair by reducing wound scar tissue formation and fibroblast overactivation.
Collapse
Affiliation(s)
- Yuzhi Liu
- Department of Gastroenterology and Hepatology, West China Hospital, Sichuan University, Chengdu, 610041, China.
| | - Bihan Xia
- Department of Gastroenterology and Hepatology, West China Hospital, Sichuan University, Chengdu, 610041, China.
| | - Rui Zhao
- Department of Gastroenterology and Hepatology, West China Hospital, Sichuan University, Chengdu, 610041, China.
- Department of Endoscopy, Sichuan Clinical Research Center for Cancer, Sichuan Cancer Hospital & Institute, Sichuan Cancer Center, Affiliated Cancer Hospital of University of Electronic Science and Technology of China, Chengdu, 610042, China
| | - Mei Qin
- School of Mechanical and Electrical Engineering, University of Electronic Science and Technology of China, Chengdu, 611731, China.
| | - Xuan Weng
- School of Mechanical and Electrical Engineering, University of Electronic Science and Technology of China, Chengdu, 611731, China.
| | - Zhi Zeng
- School of Mechanical and Electrical Engineering, University of Electronic Science and Technology of China, Chengdu, 611731, China.
| | - Kai Deng
- Department of Gastroenterology and Hepatology, West China Hospital, Sichuan University, Chengdu, 610041, China.
| | - Hai Jiang
- School of Mechanical and Electrical Engineering, University of Electronic Science and Technology of China, Chengdu, 611731, China.
| |
Collapse
|
4
|
Wu Z, Li Q, Wang L, Zhang Y, Liu W, Zhao S, Geng X, Fan Y. A novel biomimetic nanofibrous cardiac tissue engineering scaffold with adjustable mechanical and electrical properties based on poly(glycerol sebacate) and polyaniline. Mater Today Bio 2023; 23:100798. [PMID: 37753375 PMCID: PMC10518490 DOI: 10.1016/j.mtbio.2023.100798] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2023] [Revised: 09/02/2023] [Accepted: 09/14/2023] [Indexed: 09/28/2023] Open
Abstract
Biomaterial tissue engineering scaffolds play a critical role in providing mechanical support, promoting cells growth and proliferation. However, due to the insulation and inappropriate stiffness of most biomaterials, there is an unmet need to engineer a biomimetic nanofibrous cardiac tissue engineering scaffold with tailorable mechanical and electrical properties. Here, we demonstrate for the first time the feasibility to generate a novel type of biocompatible fibrous scaffolds by blending elastic poly(glycerol sebacate) (PGS) and conductive polyaniline (PANI) with the help of a nontoxic carrier polymer, poly (vinyl alcohol) (PVA). Aligned and random PGS/PANI scaffolds are successfully obtained after electrospinning, cross-linking, water and ethanol wash. Incorporating of different concentrations of PANI into PGS fibers, the fibrous sheets show enhanced conductivity and slower degradation rates while maintaining the favorable hemocompatibility. The elastic modulus of the PGS/PANI scaffolds is in the range of 0.65-2.18 MPa under wet conditions, which is similar to that of natural myocardium. All of these fibrous mats show good cell viability and were able to promote adhesion and proliferation of H9c2 cells. Furthermore, the in vivo host responses of both random and aligned scaffolds confirm their good biocompatibility. Therefore, these PGS/PANI scaffolds have great potential for cardiac tissue engineering.
Collapse
Affiliation(s)
- Zebin Wu
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, Beijing Advanced Innovation Centre for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing 100083, China
| | - Qiao Li
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, Beijing Advanced Innovation Centre for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing 100083, China
- School of Engineering Medicine, Beihang University, Beijing 100083, China
| | - Lizhen Wang
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, Beijing Advanced Innovation Centre for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing 100083, China
| | - Yang Zhang
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, Beijing Advanced Innovation Centre for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing 100083, China
| | - Wei Liu
- Department of Cardiology, Beijing Jishuitan Hospital, Capital Medical University, Beijing 100035, China
| | - Shudong Zhao
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, Beijing Advanced Innovation Centre for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing 100083, China
| | - Xuezheng Geng
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, Beijing Advanced Innovation Centre for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing 100083, China
| | - Yubo Fan
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, Beijing Advanced Innovation Centre for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing 100083, China
- School of Engineering Medicine, Beihang University, Beijing 100083, China
| |
Collapse
|
5
|
Chen T, Miao W, Yang Z, Yang F. From Nanovesicles to Nanobubbles Based on Repeated Compression Method. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:16740-16749. [PMID: 37962381 DOI: 10.1021/acs.langmuir.3c01817] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2023]
Abstract
Nanobubbles have been increasingly applied in biomedicine, which is attributed to their ability to work as ultrasound imaging contrast agents and powerful gene/drug carriers. Different production techniques or approaches have been developed to generate uniform and stable shelled nanobubbles. However, these shelled nanobubbles are usually prepared based on disordered shell materials, such as free phospholipids and polymers. In recent years, the continuous repeated compression method for a gas-liquid mixture has been developed to produce free and lipid-shelled nanobubbles. In this study, to explore the response of well-organized nanostructures to this method, the repeated compression method was used to treat preprepared liposomes and polymeric nanovesicles. Size distribution, morphologies, and ultrasound image contrast enhancement of these nanovesicles were determined before and after repeated compression. Results demonstrate that the presence of a phospholipid bilayer is vital to form liposome-based nanobubbles. And the low elastic modulus of the polymeric membrane is key to encapsulate gases into polymeric nanovesicles. Overall, it demonstrated the advantages of well-organized nanostructures to produce nanobubble structures, giving new insights into the preparation and understanding of nanobubbles.
Collapse
Affiliation(s)
- Tiandong Chen
- State Key Laboratory of Digital Medical Engineering, Jiangsu Key Laboratory for Biomaterials and Devices, School of Biological Sciences and Medical Engineering, Southeast University, Nanjing 210096, Jiangsu, China
| | - Weiling Miao
- State Key Laboratory of Digital Medical Engineering, Jiangsu Key Laboratory for Biomaterials and Devices, School of Biological Sciences and Medical Engineering, Southeast University, Nanjing 210096, Jiangsu, China
| | - Zhenrong Yang
- State Key Laboratory of Digital Medical Engineering, Jiangsu Key Laboratory for Biomaterials and Devices, School of Biological Sciences and Medical Engineering, Southeast University, Nanjing 210096, Jiangsu, China
| | - Fang Yang
- State Key Laboratory of Digital Medical Engineering, Jiangsu Key Laboratory for Biomaterials and Devices, School of Biological Sciences and Medical Engineering, Southeast University, Nanjing 210096, Jiangsu, China
| |
Collapse
|
6
|
Wan B, Bao Q, Burgess D. Long-acting PLGA microspheres: advances in excipient and product analysis toward improved product understanding. Adv Drug Deliv Rev 2023; 198:114857. [PMID: 37149041 DOI: 10.1016/j.addr.2023.114857] [Citation(s) in RCA: 13] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Revised: 04/16/2023] [Accepted: 04/28/2023] [Indexed: 05/08/2023]
Abstract
Poly(lactic-co-glycolic acid) (PLGA) microspheres are a sustained-release drug delivery system with several successful commercial products used for the treatment of a variety of diseases. By utilizing PLGA polymers with different compositions, therapeutic agents can be released over durations varying from several weeks to several months. However, precise quality control of PLGA polymers and a fundamental understanding of all the factors associated with the performance of PLGA microsphere formulations remains challenging. This knowledge gap can hinder product development of both innovator and generic products. In this review, variability of the key release controlling excipient (PLGA), as well as advanced physicochemical characterization techniques for the PLGA polymer and PLGA microspheres are discussed. The relative merits and challenges of different in vitro release testing methods, in vivo pharmacokinetic studies, and in vitro-in vivo correlation development are also summarized. This review is intended to provide an in-depth understanding of long-acting microsphere products and consequently facilitate the development of these complex products.
Collapse
Affiliation(s)
- Bo Wan
- University of Connecticut, Department of Pharmaceutical Sciences, Storrs, CT 06269
| | - Quanying Bao
- University of Connecticut, Department of Pharmaceutical Sciences, Storrs, CT 06269
| | - Diane Burgess
- University of Connecticut, Department of Pharmaceutical Sciences, Storrs, CT 06269
| |
Collapse
|
7
|
Shang T, Wang K, Tang S, Shen Y, Zhou L, Zhang L, Zhao Y, Li X, Cai L, Wang J. The Flow-Induced Degradation and Vascular Cellular Response Study of Magnesium-Based Materials. Front Bioeng Biotechnol 2022; 10:940172. [PMID: 35875490 PMCID: PMC9301134 DOI: 10.3389/fbioe.2022.940172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Accepted: 05/23/2022] [Indexed: 11/24/2022] Open
Abstract
Magnesium (Mg)-based materials are considered as potential materials for biodegradable vascular stents, and some Mg-based stents have obtained regulatory approval. However, the development and application of Mg-based stents are still restricted by the rapid degradation rate of Mg and its alloys. In order to screen out the desirable Mg-based materials for stents, the degradation behavior still needs further systematic study, especially the degradation behavior under the action of near-physiological fluid. Currently, the commonly used Mg-based vascular stent materials include pure Mg, AZ31, and WE43. In this study, we systematically evaluated their corrosion behaviors in a dynamic environment and studied the effect of their degradation products on the behavior of vascular cells. The results revealed that the corrosion rate of different Mg-based materials was related to the composition of the elements. The dynamic environment accelerated the corrosion of Mg-based materials. All the same, AZ31 still shows good corrosion resistance. The effect of corrosive products on vascular cells was beneficial to re-endothelialization and inhibition of smooth muscle cell proliferation at the implantation site of vascular stent materials.
Collapse
|
8
|
Li R, Liu K, Huang X, Li D, Ding J, Liu B, Chen X. Bioactive Materials Promote Wound Healing through Modulation of Cell Behaviors. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022; 9:e2105152. [PMID: 35138042 PMCID: PMC8981489 DOI: 10.1002/advs.202105152] [Citation(s) in RCA: 81] [Impact Index Per Article: 40.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Revised: 12/24/2021] [Indexed: 05/13/2023]
Abstract
Skin wound repair is a multistage process involving multiple cellular and molecular interactions, which modulate the cell behaviors and dynamic remodeling of extracellular matrices to maximize regeneration and repair. Consequently, abnormalities in cell functions or pathways inevitably give rise to side effects, such as dysregulated inflammation, hyperplasia of nonmigratory epithelial cells, and lack of response to growth factors, which impedes angiogenesis and fibrosis. These issues may cause delayed wound healing or even non-healing states. Current clinical therapeutic approaches are predominantly dedicated to preventing infections and alleviating topical symptoms rather than addressing the modulation of wound microenvironments to achieve targeted outcomes. Bioactive materials, relying on their chemical, physical, and biological properties or as carriers of bioactive substances, can affect wound microenvironments and promote wound healing at the molecular level. By addressing the mechanisms of wound healing from the perspective of cell behaviors, this review discusses how bioactive materials modulate the microenvironments and cell behaviors within the wounds during the stages of hemostasis, anti-inflammation, tissue regeneration and deposition, and matrix remodeling. A deeper understanding of cell behaviors during wound healing is bound to promote the development of more targeted and efficient bioactive materials for clinical applications.
Collapse
Affiliation(s)
- Ruotao Li
- Department of Hand and Foot SurgeryThe First Hospital of Jilin University1 Xinmin StreetChangchun130065P. R. China
- Key Laboratory of Polymer EcomaterialsChangchun Institute of Applied ChemistryChinese Academy of Sciences5625 Renmin StreetChangchun130022P. R. China
| | - Kai Liu
- Department of Hand and Foot SurgeryThe First Hospital of Jilin University1 Xinmin StreetChangchun130065P. R. China
- Key Laboratory of Polymer EcomaterialsChangchun Institute of Applied ChemistryChinese Academy of Sciences5625 Renmin StreetChangchun130022P. R. China
| | - Xu Huang
- Key Laboratory of Polymer EcomaterialsChangchun Institute of Applied ChemistryChinese Academy of Sciences5625 Renmin StreetChangchun130022P. R. China
- Department of Hepatobiliary and Pancreatic SurgeryThe First Hospital of Jilin University1 Xinmin StreetChangchun130065P. R. China
| | - Di Li
- Department of Hepatobiliary and Pancreatic SurgeryThe First Hospital of Jilin University1 Xinmin StreetChangchun130065P. R. China
| | - Jianxun Ding
- Key Laboratory of Polymer EcomaterialsChangchun Institute of Applied ChemistryChinese Academy of Sciences5625 Renmin StreetChangchun130022P. R. China
| | - Bin Liu
- Department of Hand and Foot SurgeryThe First Hospital of Jilin University1 Xinmin StreetChangchun130065P. R. China
| | - Xuesi Chen
- Key Laboratory of Polymer EcomaterialsChangchun Institute of Applied ChemistryChinese Academy of Sciences5625 Renmin StreetChangchun130022P. R. China
| |
Collapse
|
9
|
Yang X, Zhang W, Yao J, Sun A, Gao Y, Guo M, Fan Y. The differences between surface degradation and bulk degradation of FEM on the prediction of the degradation time for poly (lactic-co-glycolic acid) stent. Comput Methods Biomech Biomed Engin 2021; 25:65-72. [PMID: 34582282 DOI: 10.1080/10255842.2021.1931846] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
The degradation time is a crucial factor in evaluating the performance of poly (lactic-co-glycolic acid) (PLGA) stents. Bulk degradation mode was commonly used to analyze the stent degradation behavior by finite element approach. However, the PLGA stents may present surface degradation more than bulk degradation under certain conditions, which will greatly affect the degradation time after implantation. In this study, the degradation processes of the poly (lactic-co-glycolic acid) stent were reproduced utilizing finite element analysis. Both bulk degradation and surface degradation modes were considered. The correlation between tensile stress and degradation rate was investigated. The degradation time was analyzed selectively. The stress distribution, fracture, and mass loss were also compared between bulk degradation mode and surface degradation mode. The simulation results showed that, in both evolution modes, the degradation began at the 'peak-valley' region and fracture occurred at the cross of links and rings. Additionally, high levels of Von-Mises stress were observed in these two regions. Compared with bulk degradation, the fracture time of the stent was delayed by 63% in the surface degradation mode. In conclusion, the mass loss rate and scaffolding period showed great differences between surface degradation and bulk degradation. Based on this study, it is suggested that bulk degradation mode is not applicable to the case of inadequate water uptake mode, such as the tracheal stent degradation process. More experimental research should be carried out to accurately predict the scaffolding period after implantation. The mechanical properties of the fracture zone should be strengthened.
Collapse
Affiliation(s)
- Xianda Yang
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Weirong Zhang
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Jie Yao
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Anqiang Sun
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Yuanming Gao
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, China.,School of Engineering Medicine, Beihang University, Beijing, China
| | - Meng Guo
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Yubo Fan
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, China.,School of Engineering Medicine, Beihang University, Beijing, China
| |
Collapse
|
10
|
Liu Z, Zhang H, Lai H. Fluid flow effects on the degradation kinetics of bioresorbable polymers. Comput Methods Biomech Biomed Engin 2021; 24:1073-1084. [PMID: 33719755 DOI: 10.1080/10255842.2020.1867115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Implants, tissue engineering scaffolds made of biodegradable polymers are widely used in biomedical engineering. The degradation of polymers plays a critical role in the effectiveness of these applications. In this paper, the mechanism of the hydrolytic degradation affected by the flow medium is studied. The results indicate that both high porosity and dynamic conditions may significantly slow down degradation speed. A critical value of the Reynolds number is found to exist. When the Reynolds number is higher than the critical value, the autocatalysis was suppressed. The models reported in this article might serve as a guide to design 3D biodegradable implants.
Collapse
Affiliation(s)
- Zhitao Liu
- School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, P.R. China
| | - Hongbo Zhang
- School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, P.R. China
| | - Huanxin Lai
- School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, P.R. China
| |
Collapse
|
11
|
Zhang F, King MW. Biodegradable Polymers as the Pivotal Player in the Design of Tissue Engineering Scaffolds. Adv Healthc Mater 2020; 9:e1901358. [PMID: 32424996 DOI: 10.1002/adhm.201901358] [Citation(s) in RCA: 90] [Impact Index Per Article: 22.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2019] [Revised: 04/03/2020] [Indexed: 01/15/2023]
Abstract
Biodegradable polymers play a pivotal role in in situ tissue engineering. Utilizing various technologies, researchers have been able to fabricate 3D tissue engineering scaffolds using biodegradable polymers. They serve as temporary templates, providing physical and biochemical signals to the cells and determining the successful outcome of tissue remodeling. Furthermore, a biodegradable scaffold also presents the fourth dimension for tissue engineering, namely time. The properties of the biodegradable polymer change over time, presenting continuously changing features during the degradation process. These changes become more complicated when different materials are combined together to fabricate a composite or heterogeneous scaffold. This review undertakes a systematic analysis of the basic characteristics of biodegradable polymers and describe recent advances in making composite biodegradable scaffolds for in situ tissue engineering and regenerative medicine. The interaction between implanted biodegradable biomaterials and the in vivo environment are also discussed, including the properties and functional changes of the degradable scaffold, the local effect of degradation on the contiguous tissue and their evaluation using both in vitro and in vivo models.
Collapse
Affiliation(s)
- Fan Zhang
- Wilson College of TextilesNorth Carolina State University Raleigh NC 27606 USA
| | - Martin W. King
- Wilson College of TextilesNorth Carolina State University Raleigh NC 27606 USA
- College of TextilesDonghua University Songjiang District Shanghai 201620 China
| |
Collapse
|
12
|
Li F, Li X, He R, Cheng J, Ni Z, Zhao G. Preparation and evaluation of poly(D, L-lactic acid)/poly(L-lactide-co-ε-caprolactone) blends for tunable sirolimus release. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2020.124518] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
13
|
Abbasnezhad N, Shirinbayan M, Tcharkhtchi A, Bakir F. In vitro study of drug release from various loaded polyurethane samples and subjected to different non-pulsed flow rates. J Drug Deliv Sci Technol 2020. [DOI: 10.1016/j.jddst.2020.101500] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
|
14
|
Gao Y, Wang L, Li L, Gu X, Zhang K, Xia J, Fan Y. Effect of stress on corrosion of high-purity magnesium in vitro and in vivo. Acta Biomater 2019; 83:477-486. [PMID: 30445159 DOI: 10.1016/j.actbio.2018.11.019] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2018] [Revised: 10/07/2018] [Accepted: 11/12/2018] [Indexed: 11/15/2022]
Abstract
Magnesium-based implants are subjected to complicated stresses during implantation in the human body. The stress effects on corrosion of magnesium (Mg) in vitro were investigated in previous studies, whereas in this study, the corrosion behaviors of high-purity (HP) Mg under stress were comparatively studied in vitro in Hank's solution and in vivo in the subcutaneous environment of rats. Loading devices were designed to apply compressive stress (15.1 ± 0.5 MPa) and tensile stress (13.2 ± 0.2 MPa) on HP Mg specimens both in vitro and in vivo. Corrosion rates of HP Mg were characterized by mass and volume losses. It was shown that the applied compressive stress had no effect on in vitro corrosion behaviors and the applied tensile stress accelerated the in vitro corrosion, thereby causing severe pitting corrosions and stress corrosion cracking (SCC). However, there was no significant change for corrosion behaviors in vivo under neither compressive stress nor tensile stress. Severe pitting corrosion and SCC did not occur in vivo. Histological evaluation revealed that a fibrotic capsule induced by foreign body reaction was formed on the corrosion surfaces of HP Mg in the subcutaneous environment. It was proposed that the fibrotic capsule suppressed the effects of stress in vivo by protecting the corrosion surfaces. These results provided new insights into understanding the stress effects on the corrosion of Mg both in vitro and in vivo. STATEMENT OF SIGNIFICANCE: Mg and its alloys have shown potential as biodegradable metallic materials. During implantation, Mg is subjected to various mechanical environments in the human body. It is necessary to have a clear understanding of different effects of stress on Mg corrosion. However, few studies were performed in vivo. It is important to analyze the effect of quantitative stress on Mg corrosion in vivo. Therefore, in this study, quantitative stresses were applied on Mg both in vitro and in vivo. The effects of stress on in vitro and in vivo corrosions of Mg were investigated and compared.
Collapse
Affiliation(s)
- Yuanming Gao
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing 100083, China; Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing 100083, China
| | - Lizhen Wang
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing 100083, China; Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing 100083, China.
| | - Linhao Li
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing 100083, China; Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing 100083, China
| | - Xuenan Gu
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing 100083, China; Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing 100083, China
| | - Kuo Zhang
- Department of Laboratory Animal Science, Peking University Health Science Center, Beijing 100191, China
| | - Jie Xia
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing 100083, China; Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing 100083, China
| | - Yubo Fan
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing 100083, China; Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing 100083, China; National Research Center for Rehabilitation Technical Aids, Beijing 100176, China.
| |
Collapse
|
15
|
Gu XN, Lu Y, Wang F, Lin W, Li P, Fan Y. The effect of tensile and fluid shear stress on the in vitro degradation of magnesium alloy for stent applications. Bioact Mater 2018; 3:448-454. [PMID: 30182072 PMCID: PMC6120427 DOI: 10.1016/j.bioactmat.2018.08.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2018] [Revised: 08/27/2018] [Accepted: 08/27/2018] [Indexed: 12/27/2022] Open
Abstract
Magnesium alloys have gained great attention as biodegradable materials for stent applications. Cardiovascular stents are continuously exposed to different types of mechanical loadings simultaneously during service, including tensile, compressive and fluid shear stress. In this study, the in vitro degradation of WE43 wires was investigated under combined effect of tensile loading and fluid shear stress and compared with that experienced an individual loading condition. For the individual mechanical loading treatment, the degradation of magnesium wires was more severely affected by tensile loading than fluid shear stress. Under tensile loading, magnesium wires showed faster increment of corrosion rates, loss of mechanical properties and localized corrosion morphology with the increasing tensile loadings. With the combined stress, smaller variation of the corrosion rates as well as the slower strength degeneration was shown with increasing stress levels, in comparison with the individual treatment of tensile loading. This study could help to understand the effect of complex stress condition on the corrosion of magnesium for the optimization of biodegradable magnesium stents. Tensile loading induced the localized corrosion and fast degeneration of mechanical properties of magnesium wires. Relatively homogeneous corrosion of magnesium wires was observed under fluid shear stress. Under combined stresses, smaller variation of the corrosion rates and the slower strength decay was shown with increasing stresses.
Collapse
Affiliation(s)
- Xue-Nan Gu
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing, 10083, China.,Beijing Advanced Innovation Centre for Biomedical Engineering, Beihang University, Beijing, 102402, China
| | - Yun Lu
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing, 10083, China
| | - Fan Wang
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing, 10083, China
| | - Wenting Lin
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing, 10083, China
| | - Ping Li
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing, 10083, China.,Beijing Advanced Innovation Centre for Biomedical Engineering, Beihang University, Beijing, 102402, China
| | - Yubo Fan
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing, 10083, China.,Beijing Advanced Innovation Centre for Biomedical Engineering, Beihang University, Beijing, 102402, China.,National Research Center for Rehabilitation Technical Aids, Beijing, 100176, China
| |
Collapse
|
16
|
Aligned contiguous microfiber platform enhances neural differentiation of embryonic stem cells. Sci Rep 2018; 8:6087. [PMID: 29666444 PMCID: PMC5904125 DOI: 10.1038/s41598-018-24522-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2017] [Accepted: 04/03/2018] [Indexed: 11/09/2022] Open
Abstract
A microfiber platform that is able to enhance neuronal differentiation and guide aligned neurite outgrowths is essential to the repair of nerve damage. To achieve this aim, we utilized biocompatible and biodegradable poly lactic-co-glycolic acid (PLGA) to design a novel Aligned Contiguous Microfiber Platform (ACMFP) as substrates for the neuronal induction of mouse embryonic stem (ES) cells. To generate the ACMFP, a modified micro-fluid chip system was established to control microfiber parameters including fiber diameter, alignment, and the distance between fibers. Further, Pluronic-F127 was applied to the ACMFP system to maintain a stable and highly aligned fiber platform for at least 12 days. We found that the ACMFP can enhance the neuronal differentiation of mouse ES cells. The ACMFP system showed significantly better neurite outgrowth alignment guidance compared to the control substrate. The effects of alignment guidance were inversely proportionate to the diameter of the fiber, with the optimal diameter size of 60 µm. This study demonstrates a novel ACMFP system that can be used as a biomaterial substrate for neurite outgrowth alignment guidance, which may provide a new model for the development of a multidisciplinary treatment option for nerve injuries.
Collapse
|
17
|
The Effect of Fluid Shear Stress on the In Vitro Release Kinetics of Sirolimus from PLGA Films. Polymers (Basel) 2017; 9:polym9110618. [PMID: 30965925 PMCID: PMC6418679 DOI: 10.3390/polym9110618] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2017] [Revised: 10/31/2017] [Accepted: 11/10/2017] [Indexed: 12/27/2022] Open
Abstract
Drug-carrying coatings of stents implanted in blood vessels are exposed to various blood flows. This study investigated the effect of fluid shear stress on the in vitro release kinetics of sirolimus from poly(lactic-co-glycolic acid) (PLGA) films. The homemade parallel plate flow chamber was used to exert quantitative shear stress on the sirolimus-carrying film. By adjusting the flow rate of the release media in the chamber, three levels of shear stress (3.6, 12.0, and 36.0 dyn/cm²) were respectively applied. For each level of shear stress employed, the release kinetics of sirolimus from the PLGA films exhibited a four-phase profile: an initial burst release phase (Phase I), a lag phase (Phase II), a second burst release phase (Phase III), and a terminal release phase (Phase IV). During Phases I and II, sirolimus was released slowly and in small amounts (<10%); however, during Phases III and IV, the drug release increased considerably. Comparisons of different shear stresses indicated that greater shear stress resulted in earlier and faster sirolimus release, with more cumulative drug release observed. PLGA film degradations (molecular weight reduction, mass loss, and surface topographical variations) were also investigated to better explain the observed drug release behavior. Consequently, fluid shear stress was found to significantly accelerate the release of sirolimus from the PLGA matrices. Therefore, this study could provide a practical method for evaluating the in vitro drug release from polymer matrices under uniform shear stress, and might help improve the design of biodegradable coatings on drug-eluting stents.
Collapse
|
18
|
Li Y, Chu Z, Li X, Ding X, Guo M, Zhao H, Yao J, Wang L, Cai Q, Fan Y. The effect of mechanical loads on the degradation of aliphatic biodegradable polyesters. Regen Biomater 2017; 4:179-190. [PMID: 28596915 PMCID: PMC5458542 DOI: 10.1093/rb/rbx009] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2017] [Revised: 03/01/2017] [Accepted: 03/06/2017] [Indexed: 12/11/2022] Open
Abstract
Aliphatic biodegradable polyesters have been the most widely used synthetic polymers for developing biodegradable devices as alternatives for the currently used permanent medical devices. The performances during biodegradation process play crucial roles for final realization of their functions. Because physiological and biochemical environment in vivo significantly affects biodegradation process, large numbers of studies on effects of mechanical loads on the degradation of aliphatic biodegradable polyesters have been launched during last decades. In this review article, we discussed the mechanism of biodegradation and several different mechanical loads that have been reported to affect the biodegradation process. Other physiological and biochemical factors related to mechanical loads were also discussed. The mechanical load could change the conformational strain energy and morphology to weaken the stability of the polymer. Besides, the load and pattern could accelerate the loss of intrinsic mechanical properties of polymers. This indicated that investigations into effects of mechanical loads on the degradation should be indispensable. More combination condition of mechanical loads and multiple factors should be considered in order to keep the degradation rate controllable and evaluate the degradation process in vivo accurately. Only then can the degradable devise achieve the desired effects and further expand the special applications of aliphatic biodegradable polyesters.
Collapse
Affiliation(s)
- Ying Li
- School of Biological Science and Medical Engineering, Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Beihang University, Beijing 100191, People’s Republic of China
| | - Zhaowei Chu
- School of Biological Science and Medical Engineering, Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Beihang University, Beijing 100191, People’s Republic of China
| | - Xiaoming Li
- School of Biological Science and Medical Engineering, Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Beihang University, Beijing 100191, People’s Republic of China
| | - Xili Ding
- School of Biological Science and Medical Engineering, Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Beihang University, Beijing 100191, People’s Republic of China
| | - Meng Guo
- School of Biological Science and Medical Engineering, Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Beihang University, Beijing 100191, People’s Republic of China
| | - Haoran Zhao
- Department of Biomedical Engineer, University of Cincinnati, Cincinnati, OH 45221, USA
| | - Jie Yao
- School of Biological Science and Medical Engineering, Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Beihang University, Beijing 100191, People’s Republic of China
| | - Lizhen Wang
- School of Biological Science and Medical Engineering, Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Beihang University, Beijing 100191, People’s Republic of China
| | - Qiang Cai
- Key Laboratory of Advanced Materials of Ministry of Education of China, Tsinghua University, Beijing 100084, People’s Republic of China
| | - Yubo Fan
- School of Biological Science and Medical Engineering, Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Beihang University, Beijing 100191, People’s Republic of China
- National Research Center for Rehabilitation Technical Aids, Beijing 100176, People’s Republic of China
| |
Collapse
|
19
|
Cui HK, Li FB, Guo YC, Zhao YL, Yan RF, Wang W, Li YD, Wang YL, Yuan GY. Intermediate analysis of magnesium alloy covered stent for a lateral aneurysm model in the rabbit common carotid artery. Eur Radiol 2017; 27:3694-3702. [PMID: 28124747 DOI: 10.1007/s00330-016-4715-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2016] [Revised: 12/09/2016] [Accepted: 12/15/2016] [Indexed: 11/26/2022]
Abstract
OBJECTIVE To analyze the outcomes of a magnesium alloy covered stent (MACS) for a lateral aneurysm model in common carotid artery (CCA). METHODS In 32 rabbits, a MACS (group A, n = 17) or a Willis covered stent (WCS; group B, n = 15) was inserted and the rabbits were sacrificed 1, 3, 6, or 12 months after stenting. Angiography and intravascular ultrasound (IVUS) were performed at 3, 6, and 12 months. Scanning electron microscopy was performed for six stents in each group at 1, 3, and 6 months, and histopathology and histomorphology were conducted at 3 (n = 4), 6 (n = 4), and 12 (n = 12) months. RESULTS Final angiography showed complete occlusion of the aneurysms in 12 cases. IVUS at 6 and 12 months revealed a significant increase in mean lumen area of the stented CCA in group A and also showed greater mean lumen area in group A than in group B. The endothelialization process was quicker in group A than in group B. CONCLUSION MACS is effective for occlusion of lateral aneurysms and is superior to WCS in growth of the stented CCA and endothelialization. Further work is needed to make this device available for human use. KEY POINTS • The MACS is an effective approach for occlusion of a lateral aneurysm. • IVUS showed that the CCA could grow following degradation of the MACS. • The lumen area of the stented CCA was excellent in MACS. • HE staining displayed the degradation of the magnesium alloy stent. • Combination of IVUS and DSA were applied in this study.
Collapse
Affiliation(s)
- Hong-Kai Cui
- Department of Interventional Radiology, The First Affiliated Hospital, Xinxiang Medical University, Xinxiang, Henan Province, China
- , No.88, Jian Kang Road, Weihui, 453100, Henan Province, China
| | - Fen-Bao Li
- Department of Interventional Radiology, The First Affiliated Hospital, Xinxiang Medical University, Xinxiang, Henan Province, China
- , No.88, Jian Kang Road, Weihui, 453100, Henan Province, China
| | - Ying-Chang Guo
- Department of Interventional Radiology, The First Affiliated Hospital, Xinxiang Medical University, Xinxiang, Henan Province, China
- , No.88, Jian Kang Road, Weihui, 453100, Henan Province, China
| | - Yong-Li Zhao
- Department of Interventional Radiology, The First Affiliated Hospital, Xinxiang Medical University, Xinxiang, Henan Province, China
- , No.88, Jian Kang Road, Weihui, 453100, Henan Province, China
| | - Rui-Fang Yan
- Department of Interventional Radiology, The First Affiliated Hospital, Xinxiang Medical University, Xinxiang, Henan Province, China
- , No.88, Jian Kang Road, Weihui, 453100, Henan Province, China
| | - Wu Wang
- Department of Interventional Radiology, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, (Fengxian Hospital), Shanghai, 200233, China
- , No. 600, Yi Shan Road, Shanghai, 200233, China
| | - Yong-Dong Li
- Department of Interventional Radiology, The First Affiliated Hospital, Xinxiang Medical University, Xinxiang, Henan Province, China.
- , No.88, Jian Kang Road, Weihui, 453100, Henan Province, China.
- Department of Interventional Radiology, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, (Fengxian Hospital), Shanghai, 200233, China.
- , No. 600, Yi Shan Road, Shanghai, 200233, China.
| | - Yong-Li Wang
- Department of Interventional Radiology, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, (Fengxian Hospital), Shanghai, 200233, China.
- , No. 6600, Nan Feng Road, Shanghai, 210499, China.
| | - Guang-Yin Yuan
- National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, Shanghai, 200240, China.
- , No. 800, Dong Chuan Road, Shanghai, 200240, China.
| |
Collapse
|
20
|
Guerra AJ, San J, Ciurana J. Fabrication of PCL/PLA Composite Tube for Stent Manufacturing. ACTA ACUST UNITED AC 2017. [DOI: 10.1016/j.procir.2017.03.339] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
21
|
Chu Z, Li X, Li Y, Zheng Q, Feng C, Guo M, Ding X, Feng W, Gao Y, Yao J, Chen X, Wang L, Fan Y. Effects of different fluid shear stress patterns on the in vitro degradation of poly(lactide-co-glycolide) acid membranes. J Biomed Mater Res A 2016; 105:23-30. [PMID: 27507409 DOI: 10.1002/jbm.a.35860] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2016] [Revised: 07/26/2016] [Accepted: 08/05/2016] [Indexed: 01/30/2023]
Abstract
The applications of poly (lactide-co-glycolide) acid (PLGA) for coating or fabricating polymeric biodegradable stents (BDSs) have drawn more attention. The fluid shear stress has been proved to affect the in vitro degradation process of PLGA membranes. During the maintenance, BDSs could be suffered different patterns of fluid shear stress, but the effect of these different patterns on the whole degradation process is unclear. In this study, in vitro degradation of PLGA membranes was examined with steady, sinusoid, and squarewave fluid shear stress patterns in 150 mL deionized water at 37°C for 20 days, emphasizing on the changes in the viscosity of the degradation solution, mechanical, and morphological properties of the samples. The unsteady fluid shear stress with the same average magnitude as the steady one accelerate the in vitro degradation process of PLGA membranes in terms of maximum fluid shear stress and "window" of effectiveness. Maximum fluid shear stress accelerates the in vitro degradation of molecular fragments that diffused out in the solution while the "window" of effectiveness affects too in the early stage. Besides, maximum fluid shear stress and "window" of effectiveness accelerates the in vitro loss of tensile modulus and ultimate strength of the PLGA membranes while the maximum fluid shear stress plays the leading role in the decrease of tensile modulus at the early degradation stage. This study could help advance the degradation design of PLGA membranes under different fluid shear stress patterns for biomedical applications like stents and drug release systems. © 2016 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 105A: 23-30, 2017.
Collapse
Affiliation(s)
- Zhaowei Chu
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Beijing, China.,Key Laboratory for Optimal Design and Evaluation Technology of Implantable & Interventional Medical Devices, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Xiaoming Li
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Beijing, China.,Key Laboratory for Optimal Design and Evaluation Technology of Implantable & Interventional Medical Devices, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Ying Li
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Beijing, China.,Key Laboratory for Optimal Design and Evaluation Technology of Implantable & Interventional Medical Devices, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Quan Zheng
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Beijing, China.,Key Laboratory for Optimal Design and Evaluation Technology of Implantable & Interventional Medical Devices, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Chenglong Feng
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Beijing, China.,Key Laboratory for Optimal Design and Evaluation Technology of Implantable & Interventional Medical Devices, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Meng Guo
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Beijing, China.,Key Laboratory for Optimal Design and Evaluation Technology of Implantable & Interventional Medical Devices, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Xili Ding
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Beijing, China.,Key Laboratory for Optimal Design and Evaluation Technology of Implantable & Interventional Medical Devices, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Wentao Feng
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Beijing, China.,Key Laboratory for Optimal Design and Evaluation Technology of Implantable & Interventional Medical Devices, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Yuanming Gao
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Beijing, China.,Key Laboratory for Optimal Design and Evaluation Technology of Implantable & Interventional Medical Devices, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Jie Yao
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Beijing, China.,Key Laboratory for Optimal Design and Evaluation Technology of Implantable & Interventional Medical Devices, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Xiaofang Chen
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Beijing, China.,Key Laboratory for Optimal Design and Evaluation Technology of Implantable & Interventional Medical Devices, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Lizhen Wang
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Beijing, China.,Key Laboratory for Optimal Design and Evaluation Technology of Implantable & Interventional Medical Devices, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Yubo Fan
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Beijing, China.,Key Laboratory for Optimal Design and Evaluation Technology of Implantable & Interventional Medical Devices, School of Biological Science and Medical Engineering, Beihang University, Beijing, China.,National Research Center for Rehabilitation Technical Aids, Beijing, China
| |
Collapse
|