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He S, Wei L, Wang G, Pugno NM, Chen Q, Li Z. In Silico Evaluation of In Vivo Degradation Kinetics of Poly(Lactic Acid) Vascular Stent Devices. J Funct Biomater 2024; 15:135. [PMID: 38786646 PMCID: PMC11122488 DOI: 10.3390/jfb15050135] [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: 03/28/2024] [Revised: 05/09/2024] [Accepted: 05/11/2024] [Indexed: 05/25/2024] Open
Abstract
Biodegradable vascular stents (BVS) are deemed as great potential alternatives for overcoming the inherent limitations of permanent metallic stents in the treatment of coronary artery diseases. The current study aimed to comprehensively compare the mechanical behaviors of four poly(lactic acid) (PLA) BVS designs with varying geometries via numerical methods and to clarify the optimal BVS selection. Four PLA BVS (i.e., Absorb, DESolve, Igaki-Tamai, and Fantom) were first constructed. A degradation model was refined by simply including the fatigue effect induced by pulsatile blood pressures, and an explicit solver was employed to simulate the crimping and degradation behaviors of the four PLA BVS. The degradation dynamics here were characterized by four indices. The results indicated that the stent designs affected crimping and degradation behaviors. Compared to the other three stents, the DESolve stent had the greatest radial stiffness in the crimping simulation and the best diameter maintenance ability despite its faster degradation; moreover, the stent was considered to perform better according to a pilot scoring system. The current work provides a theoretical method for studying and understanding the degradation dynamics of the PLA BVS, and it could be helpful for the design of next-generation BVS.
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Affiliation(s)
- Shicheng He
- Biomechanics Laboratory, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, China
| | - Lingling Wei
- School of Food and Biological Engineering, Hefei University of Technology, Hefei 230601, China
| | - Guixue Wang
- Key Laboratory for Biorheological Science and Technology of Ministry of Education, State and Local Joint Engineering Laboratory for Vascular Implants, Bioengineering College of Chongqing University, Chongqing 400030, China
| | - Nicola M. Pugno
- Laboratory for Bioinspired, Bionic, Nano, Meta Materials and Mechanics, University of Trento, Via Mesiano 77, 38123 Trento, Italy
- School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, London E1 4NS, UK
| | - Qiang Chen
- Biomechanics Laboratory, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, China
| | - Zhiyong Li
- Biomechanics Laboratory, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, China
- School of Mechanical, Medical and Process Engineering, Queensland University of Technology, Brisbane, QLD 4001, Australia
- Faculty of Sports Science, Ningbo University, Ningbo 315211, China
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He S, Liu W, Wei L, Chen Q, Li Z. A phenomenological model of pulsatile blood pressure-affected degradation of polylactic acid (PLA) vascular stent. Med Biol Eng Comput 2024; 62:1347-1359. [PMID: 38183527 DOI: 10.1007/s11517-023-02998-6] [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: 05/05/2023] [Accepted: 12/09/2023] [Indexed: 01/08/2024]
Abstract
The stent implantation may alter the post-operative patient's blood pressure, and bioresorbable vascular stents (BVS) as a candidate to treat vascular diseases, its degradation is affected by mechanical stress, thus, the altered pressure representing varying stress level will result in different degradation behaviors of the BVS. This paper first proposed a novel stress-regulated PLA degradation model that included swelling factor, and then the degradation evolutions of a PLA BVS within 180 days under normal and high blood pressures were simulated by finite element method, and more four degradation indexes were defined to study the effects of the two blood pressures on the degradation of the PLA BVS. The results showed that the high pressure weakly accelerated the degradation of the PLA BVS with respect to the normal pressure by examining the four indexes, e.g., the residual stent volumev r ( t ) decreased to 0.72 and 0.69, respectively for the normal and high pressures at day 180. The current finding provided a theoretical understanding of the PLA BVS degradation, and hinted that the PLA BVS may not need to be elaborately selected in clinical practices for treating hypertensive patients.
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Affiliation(s)
- Shicheng He
- Biomechanics Laboratory, School of Biological Science and Medical Engineering, Southeast University, Nanjing, 210096, People's Republic of China
| | - Wanling Liu
- Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Nanjing University, Nanjing, 210023, People's Republic of China
| | - Lingling Wei
- School of Food and Biological Engineering, Hefei University of Technology, Hefei, 230601, People's Republic of China
| | - Qiang Chen
- Biomechanics Laboratory, School of Biological Science and Medical Engineering, Southeast University, Nanjing, 210096, People's Republic of China.
| | - Zhiyong Li
- Biomechanics Laboratory, School of Biological Science and Medical Engineering, Southeast University, Nanjing, 210096, People's Republic of China.
- School of Mechanical, Medical and Process Engineering, Queensland University of Technology, Brisbane, QLD4001, Australia.
- Faculty of Sports Science, Ningbo University, Ningbo, 315211, People's Republic of China.
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Qi J, Zhang H, Chen S, Du T, Zhang Y, Qiao A. Numerical Simulation of Dynamic Degradation and Fatigue Damage of Degradable Zinc Alloy Stents. J Funct Biomater 2023; 14:547. [PMID: 37998116 PMCID: PMC10672128 DOI: 10.3390/jfb14110547] [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: 10/09/2023] [Revised: 11/09/2023] [Accepted: 11/09/2023] [Indexed: 11/25/2023] Open
Abstract
Current research on the fatigue properties of degradable zinc alloy stents has not yet considered the issue of the fatigue life changing with material properties during the dynamic degradation process. Therefore, in this paper, we established a fatigue damage algorithm to study the fatigue problem affected by the changing of material properties during the dynamic degradation process of the stent under the action of pulsating cyclic loading. Three models: the dynamic degradation model, the dynamic degradation model under pulsating cyclic loading, and the coupled model of fatigue damage and dynamic degradation, were developed to verify the effect of fatigue damage on stent life. The results show that fatigue damage leads to a deeper degree of inhomogeneous degradation of the stent, which affects the service life of the stent. Fatigue damage is a factor that cannot be ignored. Therefore, when studying the mechanical properties and lifetime of degradable stents, incorporating fatigue damage into the study can help more accurately assess the lifetime of the stents.
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Affiliation(s)
| | | | | | | | | | - Aike Qiao
- Faculty of Environment and Life, Beijing University of Technology, Beijing 100124, China
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Qiao A, Du T, Yang H, Mu Y. Biomechanical Study and Analysis for Cardiovascular/Skeletal Materials and Devices. J Funct Biomater 2023; 14:398. [PMID: 37623643 PMCID: PMC10456227 DOI: 10.3390/jfb14080398] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Revised: 07/24/2023] [Accepted: 07/24/2023] [Indexed: 08/26/2023] Open
Abstract
The Special Issue entitled "Biomechanical Study and Analysis for Cardiovascular/Skeletal Materials and Devices" addresses biological functional materials and devices relevant to cardiovascular diseases and orthopedic conditions [...].
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Affiliation(s)
- Aike Qiao
- Faculty of Environment and Life, Beijing University of Technology, Beijing 100124, China; (T.D.); (H.Y.)
| | - Tianming Du
- Faculty of Environment and Life, Beijing University of Technology, Beijing 100124, China; (T.D.); (H.Y.)
| | - Haisheng Yang
- Faculty of Environment and Life, Beijing University of Technology, Beijing 100124, China; (T.D.); (H.Y.)
| | - Yongliang Mu
- School of Metallurgy, Northeastern University, Shenyang 110819, China;
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Li D, Dai D, Xiong G, Lan S, Zhang C. Composite Nanocoatings of Biomedical Magnesium Alloy Implants: Advantages, Mechanisms, and Design Strategies. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2023; 10:e2300658. [PMID: 37097626 PMCID: PMC10288271 DOI: 10.1002/advs.202300658] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Revised: 03/25/2023] [Indexed: 06/19/2023]
Abstract
The rapid degradation of magnesium (Mg) alloy implants erodes mechanical performance and interfacial bioactivity, thereby limiting their clinical utility. Surface modification is among the solutions to improve corrosion resistance and bioefficacy of Mg alloys. Novel composite coatings that incorporate nanostructures create new opportunities for their expanded use. Particle size dominance and impermeability may increase corrosion resistance and thereby prolong implant service time. Nanoparticles with specific biological effects may be released into the peri-implant microenvironment during the degradation of coatings to promote healing. Composite nanocoatings provide nanoscale surfaces to promote cell adhesion and proliferation. Nanoparticles may activate cellular signaling pathways, while those with porous or core-shell structures may carry antibacterial or immunomodulatory drugs. Composite nanocoatings may promote vascular reendothelialization and osteogenesis, attenuate inflammation, and inhibit bacterial growth, thus increasing their applicability in complex clinical microenvironments such as those of atherosclerosis and open fractures. This review combines the physicochemical properties and biological efficiency of Mg-based alloy biomedical implants to summarize the advantages of composite nanocoatings, analyzes their mechanisms of action, and proposes design and construction strategies, with the purpose of providing a reference for promoting the clinical application of Mg alloy implants and to further the design of nanocoatings.
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Affiliation(s)
- Dan Li
- Stomatological HospitalSchool of StomatologySouthern Medical UniversityGuangzhou510280China
| | - Danni Dai
- Stomatological HospitalSchool of StomatologySouthern Medical UniversityGuangzhou510280China
| | - Gege Xiong
- Stomatological HospitalSchool of StomatologySouthern Medical UniversityGuangzhou510280China
| | - Shuquan Lan
- Stomatological HospitalSchool of StomatologySouthern Medical UniversityGuangzhou510280China
| | - Chao Zhang
- Stomatological HospitalSchool of StomatologySouthern Medical UniversityGuangzhou510280China
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