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Jiang J, Fu T, Liu J, Wang Y, Fan J, Song H, Xiao D, Wang Y, Yang J. Real-time simulation for multi-component biomechanical analysis using localized tissue constraint progressive transfer learning. J Mech Behav Biomed Mater 2024; 158:106682. [PMID: 39142234 DOI: 10.1016/j.jmbbm.2024.106682] [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: 04/19/2024] [Revised: 07/29/2024] [Accepted: 08/08/2024] [Indexed: 08/16/2024]
Abstract
In virtual surgical training, it is crucial to achieve real-time, high-fidelity simulation of the tissue deformation. The anisotropic and nonlinear characteristics of the organ with multi-component make accurate real-time deformation simulation difficult. A localized tissue constraint progressive transfer learning method is proposed in this paper, where the base-compensated dual-output transfer learning strategy and the localized tissue constraint progressive learning architecture are developed. The proposed strategy enriches the multi-component biomechanical dataset to fully represent complex force-displacement with minimal high-quality data. Meanwhile, the proposed architecture adopts focused and progressive model to accurately describe tissues with varied biomechanical properties rather than singular homogeneous model. We made comparison with 4 state-of-the-art (SOTA) methods in simulating multi-component biomechanical deformations of organs with 100 pairs of testing data. Results show that the accuracy of our method is 50% higher than other methods in different validation matrix. And our method can stably simulate the deformations in 0.005 s per frame, which largely improves the computing efficiency.
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Affiliation(s)
- Jiaxi Jiang
- School of Optics and Photonics, Beijing Institute of Technology, Beijing, 100081, China
| | - Tianyu Fu
- School of Medical Technology, Beijing Institute of Technology, Beijing, 100081, China.
| | - Jiaqi Liu
- School of Optics and Photonics, Beijing Institute of Technology, Beijing, 100081, China
| | - Yuanyuan Wang
- School of Optics and Photonics, Beijing Institute of Technology, Beijing, 100081, China
| | - Jingfan Fan
- School of Optics and Photonics, Beijing Institute of Technology, Beijing, 100081, China
| | - Hong Song
- School of Computer Science and Technology, Beijing Institute of Technology, Beijing, 100081, China
| | - Deqiang Xiao
- School of Optics and Photonics, Beijing Institute of Technology, Beijing, 100081, China
| | - Yongtian Wang
- School of Optics and Photonics, Beijing Institute of Technology, Beijing, 100081, China.
| | - Jian Yang
- School of Optics and Photonics, Beijing Institute of Technology, Beijing, 100081, China.
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Bernini M, Hellmuth R, Dunlop C, Ronan W, Vaughan TJ. Recommendations for finite element modelling of nickel-titanium stents-Verification and validation activities. PLoS One 2023; 18:e0283492. [PMID: 37556457 PMCID: PMC10411813 DOI: 10.1371/journal.pone.0283492] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2023] [Accepted: 03/11/2023] [Indexed: 08/11/2023] Open
Abstract
The objective of this study is to present a credibility assessment of finite element modelling of self-expanding nickel-titanium (Ni-Ti) stents through verification and validation (VV) activities, as set out in the ASME VV-40 standard. As part of the study, the role of calculation verification, model input sensitivity, and model validation is examined across three different application contexts (radial compression, stent deployment in a vessel, fatigue estimation). A commercially available self-expanding Ni-Ti stent was modelled, and calculation verification activities addressed the effects of mesh density, element integration and stable time increment on different quantities of interests, for each context of use considered. Sensitivity analysis of the geometrical and material input parameters and validation of deployment configuration with in vitro comparators were investigated. Results showed similar trends for global and local outputs across the contexts of use in response to the selection of discretization parameters, although with varying sensitivities. Mesh discretisation showed substantial variability for less than 4 × 4 element density across the strut cross-section in radial compression and deployment cases, while a finer grid was deemed necessary in fatigue estimation for reliable predictions of strain/stress. Element formulation also led to substantial variation depending on the chosen integration options. Furthermore, for explicit analyses, model results were highly sensitive to the chosen target time increment (e.g., mass scaling parameters), irrespective of whether quasistatic conditions were ensured (ratios of kinetic and internal energies below 5%). The higher variability was found for fatigue life simulation, with the estimation of fatigue safety factor varying up to an order of magnitude depending on the selection of discretization parameters. Model input sensitivity analysis highlighted that the predictions of outputs such as radial force and stresses showed relatively low sensitivity to Ni-Ti material parameters, which suggests that the calibration approaches used in the literature to date appear reasonable, but a higher sensitivity to stent geometry, namely strut thickness and width, was found. In contrast, the prediction of vessel diameter following deployment was least sensitive to numerical parameters, and its validation with in vitro comparators offered a simple and accurate (error ~ 1-2%) method when predicting diameter gain, and lumen area, provided that the material of the vessel is appropriately characterized and modelled.
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Affiliation(s)
- Martina Bernini
- Biomechanics Research Centre (BioMEC), College of Science and Engineering, University of Galway, Galway, Ireland
- Vascular Flow Technologies, Dundee, United Kingdom
| | | | - Craig Dunlop
- Vascular Flow Technologies, Dundee, United Kingdom
| | - William Ronan
- Biomechanics Research Centre (BioMEC), College of Science and Engineering, University of Galway, Galway, Ireland
| | - Ted J. Vaughan
- Biomechanics Research Centre (BioMEC), College of Science and Engineering, University of Galway, Galway, Ireland
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Carpenter HJ, Ghayesh MH, Zander AC, Psaltis PJ. On the nonlinear relationship between wall shear stress topology and multi-directionality in coronary atherosclerosis. COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE 2023; 231:107418. [PMID: 36842347 DOI: 10.1016/j.cmpb.2023.107418] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2022] [Revised: 02/01/2023] [Accepted: 02/09/2023] [Indexed: 06/18/2023]
Abstract
BACKGROUND AND OBJECTIVE In this paper we investigate twelve multi-directional/topological wall shear stress (WSS) derived metrics and their relationships with the formation of coronary plaques in both computational fluid dynamics (CFD) and dynamic fluid-structure interaction (FSI) frameworks. While low WSS is one of the most established biomechanical markers associated with coronary atherosclerosis progression, alone it is limited. Multi-directional and topological WSS derived metrics have been shown to be important in atherosclerosis related mechanotransduction and near-wall transport processes. However, the relationships between these twelve WSS metrics and the influence of both FSI simulations and coronary dynamics is understudied. METHODS We first investigate the relationships between these twelve WSS derived metrics, stenosis percentage and lesion length through a parametric, transient CFD study. Secondly, we extend the parametric study to FSI, both with and without the addition of coronary dynamics, and assess their correlations. Finally, we present the case of a patient who underwent invasive coronary angiography and optical coherence tomography imaging at two time points 18 months apart. Associations between each of the twelve WSS derived metrics in CFD, static FSI and dynamic FSI simulations were assessed against areas of positive/negative vessel remodelling, and changes in plaque morphology. RESULTS 22-32% stenosis was the threshold beyond which adverse multi-directional/topological WSS results. Each metric produced a different relationship with changing stenoses and lesion length. Transient haemodynamics was impacted by coronary dynamics, with the topological shear variation index suppressed by up to 94%. These changes appear more critical at smaller stenosis levels, suggesting coronary dynamics could play a role in the earlier stages of atherosclerosis development. In the patient case, both dynamics and FSI vs CFD changes altered associations with measured changes in plaque morphology. An appendix of the linear fits between the various FSI- and CFD-based simulations is provided to assist in scaling CFD-based results to resemble the compliant walled characteristics of FSI more accurately. CONCLUSIONS These results highlight the potential for coronary dynamics to alter multi-directional/topological WSS metrics which could impact associations with changes in coronary atherosclerosis over time. These results warrant further investigation in a wider range of morphological settings and longitudinal cohort studies in the future.
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Affiliation(s)
- Harry J Carpenter
- School of Mechanical Engineering, University of Adelaide, Adelaide, South Australia 5005, Australia.
| | - Mergen H Ghayesh
- School of Mechanical Engineering, University of Adelaide, Adelaide, South Australia 5005, Australia.
| | - Anthony C Zander
- School of Mechanical Engineering, University of Adelaide, Adelaide, South Australia 5005, Australia
| | - Peter J Psaltis
- Vascular Research Centre, Lifelong Health Theme, South Australian Health and Medical Research Institute (SAHMRI), Adelaide, South Australia 5000, Australia; Adelaide Medical School, University of Adelaide, Adelaide, South Australia 5005, Australia; Department of Cardiology, Central Adelaide Local Health Network, Adelaide, South Australia 5000, Australia
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SHEN XIANG, LU KAIKAI, ZHU HONGFEI, JIANG JIABAO, TIAN RUN, LI HANQING. TORSIONAL BEHAVIOR OF STENTS: THE ROLE OF LINKER AND STENT TAPERING INVESTIGATED WITH NUMERICAL SIMULATION. J MECH MED BIOL 2022. [DOI: 10.1142/s0219519422500385] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The torsional performance is a major mechanical property of stent. A stent with good torsional performance is easy to deform along blood vessels without damaging the vascular wall to avoid in-stent restenosis (ISR). Therefore, this study aimed to study the effect of stent parameters on torsional performance. The effect of stent parameters on torsional performance was studied via finite element method (FEM). The twist metric (TM) and stress distribution of various stents were compared. The TM values of stents with I-, S-, M-, C-, and V-shaped linkers were 0.0190, 0.0191, 0.0184, 0.0141, and 0.0201[Formula: see text][Formula: see text], respectively. In addition, the TM value of the stent increased by 35.85 times when the number of linkers was increased from 2 to 8 and the stent was twisted at the same angular displacement in clockwise direction. The TM value of the stent with 1.13∘ tapering was 0.010 [Formula: see text], which was lower by 47.64% compared with that of cylindrical stent. Compared with the shape of the linker, the number of linkers had a more remarkable effect on torsional performance. Torsional performance was observably enhanced with the decrease in the number of linkers. Among the five stents with different linker shapes, the torsional performance of the stent with C-shaped linker was the best. Besides, the torsional performance of the tapered stent was better than that of the cylindrical stent. Moreover, the torsional performance increased by increasing the stent tapering. This work might provide insights into better stent design and clinical decisions.
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Affiliation(s)
- XIANG SHEN
- School of Mechanical Engineering, Jiangsu University, No. 301, Xuefu Road, Zhenjiang, China
| | - KAIKAI LU
- School of Mechanical Engineering, Jiangsu University, No. 301, Xuefu Road, Zhenjiang, China
| | - HONGFEI ZHU
- School of Mechanical Engineering, Jiangsu University, No. 301, Xuefu Road, Zhenjiang, China
| | - JIABAO JIANG
- School of Mechanical Engineering, Jiangsu University, No. 301, Xuefu Road, Zhenjiang, China
| | - RUN TIAN
- School of Mechanical Engineering, Jiangsu University, No. 301, Xuefu Road, Zhenjiang, China
| | - HANQING LI
- School of Mechanical Engineering, Jiangsu University, No. 301, Xuefu Road, Zhenjiang, China
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Karimi A, Rahmati SM, Razaghi R, Girkin CA, Crawford Downs J. Finite element modeling of the complex anisotropic mechanical behavior of the human sclera and pia mater. COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE 2022; 215:106618. [PMID: 35026624 PMCID: PMC8847341 DOI: 10.1016/j.cmpb.2022.106618] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2021] [Revised: 12/31/2021] [Accepted: 01/01/2022] [Indexed: 06/14/2023]
Abstract
BACKGROUND AND OBJECTIVE Accurate finite element (FE) simulation of the optic nerve head (ONH) depends on accurate mechanical properties of the load-bearing tissues. The peripapillary sclera in the ONH exhibits a depth-dependent, anisotropic, heterogeneous collagen fiber distribution. This study proposes a novel cable-in-solid modeling approach that mimics heterogeneous anisotropic collagen fiber distribution, validates the approach against published experimental biaxial tensile tests of scleral patches, and demonstrates its effectiveness in a complex model of the posterior human eye and ONH. METHODS A computational pipeline was developed that defines control points in the sclera and pia mater, distributes the depth-dependent circumferential, radial, and isotropic cable elements in the sclera and pia in a pattern that mimics collagen fiber orientation, and couples the cable elements and solid matrix using a mesh-free penalty-based cable-in-solid algorithm. A parameter study was performed on a model of a human scleral patch subjected to biaxial deformation, and computational results were matched to published experimental data. The new approach was incorporated into a previously published eye-specific model to test the method; results were then interpreted in relation to the collagen fibers' (cable elements) role in the resultant ONH deformations, stresses, and strains. RESULTS Results show that the cable-in-solid approach can mimic the full range of scleral mechanical behavior measured experimentally. Disregarding the collagen fibers/cable elements in the posterior eye model resulted in ∼20-60% greater tensile and shear stresses and strains, and ∼30% larger posterior deformations in the lamina cribrosa and peripapillary sclera. CONCLUSIONS The cable-in-solid approach can easily be implemented into commercial FE packages to simulate the heterogeneous and anisotropic mechanical properties of collagenous biological tissues.
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Affiliation(s)
- Alireza Karimi
- Department of Ophthalmology and Visual Sciences, University of Alabama at Birmingham, Birmingham, AL, USA.
| | | | - Reza Razaghi
- Research Department, Heel of Scene Ltd., Tokyo, Japan
| | - Christopher A Girkin
- Department of Ophthalmology and Visual Sciences, University of Alabama at Birmingham, Birmingham, AL, USA.
| | - J Crawford Downs
- Department of Ophthalmology and Visual Sciences, University of Alabama at Birmingham, Birmingham, AL, USA.
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Liu X, Liu G, Ye P, Luo Q, Chang Z. Investigation of mechanical behaviors and improved design of V-shaped braid stents. Proc Inst Mech Eng H 2022; 236:9544119221076946. [PMID: 35102787 DOI: 10.1177/09544119221076946] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
V-shaped braid stents (VBSs), as highly retrievable and flexible nitinol stents, are extensively applied in endovascular diseases. They also cause less damage to vessel wall compared to tube-cutting stents. However, poor performance of VBS or suboptimal operation can give rise to unwanted clinical situations such as thrombosis and intimal hyperplasia. Therefore, research on designing factors affecting the performance of these devices is of great significance. Furthermore, simulation of stenting process can help designers understand the interactions of stents and vessel wall to reduce time to market. Thus, finite element analysis (FEA) and bench test are performed taking into account both designing factors and stenting process of VBS, including development of parametric modeling tool, research on the relationships among structural parameters and radial force, exploration of the interactions of VBS and vessel wall and pulsating load effect. This research was performed using a commercial solver Abaqus/standard with a user material subroutine (UMAT/nitinol). Structural parameters of VBS, unit-cell height and wire diameter have significant impacts on radial force, unit-cell number has slight influence on radial force, and arc diameter has almost negligible impact on radial force. Without pulsatile load, maximum stress and strain always occur in arc position; however, in pulsatile load, maximum stress and strain are gradually transformed to strut position. The stress created near vessel wall and VBS interface is higher than interaction stress due to pulsating load. The obtained result provided valuable information on the structural design of stents as well as the effects of stent on vessel wall and that vessel wall on stent deformation.Graphical abstract[Formula: see text].
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Affiliation(s)
- Xiangkun Liu
- Shanghai Institute for Minimally Invasive Therapy, School of Health Science and Engineering, University of Shanghai for Science and Technology, Shanghai, China
| | - Guochao Liu
- Shanghai Institute for Minimally Invasive Therapy, School of Health Science and Engineering, University of Shanghai for Science and Technology, Shanghai, China
| | - Ping Ye
- Shanghai Institute for Minimally Invasive Therapy, School of Health Science and Engineering, University of Shanghai for Science and Technology, Shanghai, China
| | - Qiyi Luo
- Shanghai Institute for Minimally Invasive Therapy, School of Health Science and Engineering, University of Shanghai for Science and Technology, Shanghai, China
| | - Zhaohua Chang
- Shanghai Institute for Minimally Invasive Therapy, School of Health Science and Engineering, University of Shanghai for Science and Technology, Shanghai, China
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He R, Zhao L, Silberschmidt VV, Feng J, Serracino-Inglott F. Personalised nitinol stent for focal plaques: Design and evaluation. J Biomech 2021; 130:110873. [PMID: 34883344 DOI: 10.1016/j.jbiomech.2021.110873] [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: 09/20/2021] [Revised: 11/01/2021] [Accepted: 11/16/2021] [Indexed: 10/19/2022]
Abstract
The purpose of this study is to develop personalised nitinol stents for arteries with one and two opposite focal plaques. Novel designs are evaluated through comparison with a commercial stent design, in terms of lumen gain and shape as well as stress levels in the media layer after stenting. METHODS Personalised stents are developed for arteries with one and two opposite focal plaques, based on medical imaging of patients and computer simulations. In silico analysis is then carried out for assessment of stent performance in the diseased arteries. RESULTS Personalised designs significantly increase the lumen gain, reduce the stresses in the media layer, and improve the lumen shape compared to the commercial nitinol stent. CONCLUSION The personalised designs show outstanding performance compared to the commercial stent. SIGNIFICANCE This pilot study proves that personalised nitinol stents are able to deliver desirable treatment outcomes.
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Affiliation(s)
- Ran He
- Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Epinal Way, Loughborough LE11 3TU, UK.
| | - Liguo Zhao
- Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Epinal Way, Loughborough LE11 3TU, UK
| | - Vadim V Silberschmidt
- Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Epinal Way, Loughborough LE11 3TU, UK
| | - Jiling Feng
- Department of Engineering, Manchester Metropolitan University, Manchester M15 6BH, UK
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Zhao F, Sun J, Xue W, Wang F, King MW, Yu C, Jiao Y, Sun K, Wang L. Development of a polycaprolactone/poly( p-dioxanone) bioresorbable stent with mechanically self-reinforced structure for congenital heart disease treatment. Bioact Mater 2021; 6:2969-2982. [PMID: 33732967 PMCID: PMC7930591 DOI: 10.1016/j.bioactmat.2021.02.017] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2021] [Revised: 02/11/2021] [Accepted: 02/14/2021] [Indexed: 12/12/2022] Open
Abstract
Recent progress in bioresorbable stents (BRSs) has provided a promising alternative for treating coronary artery disease. However, there is still lack of BRSs with satisfied compression and degradation performance for pediatric patients with congenital heart disease, leading to suboptimal therapy effects. Here, we developed a mechanically self-reinforced composite bioresorbable stent (cBRS) for congenital heart disease application. The cBRS consisted of poly(p-dioxanone) monofilaments and polycaprolactone/poly(p-dioxanone) core-shell composite yarns. Interlacing points in cBRS structure were partially bonded, offering the cBRS with significantly higher compression force compared to typical braids and remained good compliance. The suitable degradation profile of the cBRS can possibly preserve vascular remodeling and healing process. In addition, the controllable structural organization provides a method to customize the performance of the cBRS by altering the proportion of different components in the braids. The in vivo results suggested the cBRS supported the vessel wall similar to that of metallic stent. In both abdominal aorta and iliac artery of porcine, cBRS was entirely endothelialized within 1 month and maintained target vessels with good patency in the 12-month follow-up. The in vivo degradation profile of the cBRS is consistent with static degradation results in vitro. It is also demonstrated that there is minimal impact of pulsatile pressure of blood flow and variation of radial force on the degradation rate of the cBRS. Moreover, the lumen of cBRS implanted vessels were enlarged after 6 months, and significantly larger than the vessels implanted with metallic stent in 12 months.
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Affiliation(s)
- Fan Zhao
- College of Textiles, Donghua University, Shanghai, 201620, China
- Key Laboratory of Textile Science and Technology, Ministry of Education, College of Textiles, Donghua University, Songjiang District, Shanghai, 201620, China
- Wilson College of Textiles, North Carolina State University, Raleigh, 27606, USA
| | - Jing Sun
- Department of Pediatric Cardiology, Xinhua Hospital, School of Medicine, Shanghai Jiao Tong University, No. 1665 Kongjiang Road, Shanghai, 200092, China
| | - Wen Xue
- College of Textiles, Donghua University, Shanghai, 201620, China
- Key Laboratory of Textile Science and Technology, Ministry of Education, College of Textiles, Donghua University, Songjiang District, Shanghai, 201620, China
| | - Fujun Wang
- College of Textiles, Donghua University, Shanghai, 201620, China
- Key Laboratory of Textile Science and Technology, Ministry of Education, College of Textiles, Donghua University, Songjiang District, Shanghai, 201620, China
| | - Martin W. King
- Wilson College of Textiles, North Carolina State University, Raleigh, 27606, USA
| | - Chenglong Yu
- College of Textiles, Donghua University, Shanghai, 201620, China
- Key Laboratory of Textile Science and Technology, Ministry of Education, College of Textiles, Donghua University, Songjiang District, Shanghai, 201620, China
| | - Yongjie Jiao
- College of Textiles, Donghua University, Shanghai, 201620, China
- Key Laboratory of Textile Science and Technology, Ministry of Education, College of Textiles, Donghua University, Songjiang District, Shanghai, 201620, China
| | - Kun Sun
- Department of Pediatric Cardiology, Xinhua Hospital, School of Medicine, Shanghai Jiao Tong University, No. 1665 Kongjiang Road, Shanghai, 200092, China
| | - Lu Wang
- College of Textiles, Donghua University, Shanghai, 201620, China
- Key Laboratory of Textile Science and Technology, Ministry of Education, College of Textiles, Donghua University, Songjiang District, Shanghai, 201620, China
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Moriwaki T, Okamoto Y, Yamaga H, Fujisaki K, Uematsu M, Sakoda H, Haishima Y. In Vitro Measurement of Contact Pressure Applied to a Model Vessel Wall during Balloon Dilation by Using a Film-Type Sensor. JOURNAL OF NEUROENDOVASCULAR THERAPY 2021; 16:192-197. [PMID: 37502454 PMCID: PMC10370994 DOI: 10.5797/jnet.oa.2021-0068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/13/2021] [Accepted: 07/05/2021] [Indexed: 07/29/2023]
Abstract
Objective As an important evaluation index of vascular damage, the study aims to clarify the value of contact pressure applied to blood vessels and how it changes with respect to balloon pressure during balloon dilation. Methods The contact pressure was evaluated through an in vitro measurement system using a model tube with almost the same elastic modulus as the blood vessel wall and our film-type pressure sensor. A poly (vinyl alcohol) hydrogel tube with almost the same elastic modulus was fabricated as the model vessel. The film-type sensor was inserted between the balloon catheter and the model vessel, and the balloon was dilated. Results The contact pressure applied to the blood vessel was less than 10% of the balloon pressure, and the increase in contact pressure was less than 1% of the increase in balloon pressure (8 to 14 atm). Moreover, the contact pressure and its increase were larger in the model with a high elastic modulus. Conclusion The contact pressure to expand the soft vessel model was not high, and the balloon pressure almost appeared to act on the expansion of the balloon itself. Our experiment using variable stiffness vessel models containing film-type sensors showed that the contact pressure acting on the vessel wall tended to increase as the wall became harder, even when the nominal diameter of the balloon was almost identical to the vessel. Our results can be clinically interpreted: when a vessel is stiff, the high-pressure inflation may rupture it even if its nominal diameter is identical to the diameter of the vessel.
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Affiliation(s)
- Takeshi Moriwaki
- Faculty of Science and Technology, Hirosaki University, Hirosaki, Aomori, Japan
| | - Yoshihiro Okamoto
- Division of Medical Devices, National Institute of Health Sciences, Kawasaki, Kanagawa, Japan
| | - Hiroo Yamaga
- Showa University Northern Yokohama Hospital, Yokohama, Kanagawa, Japan
| | - Kazuhiro Fujisaki
- Faculty of Science and Technology, Hirosaki University, Hirosaki, Aomori, Japan
| | - Miyuki Uematsu
- Division of Medical Devices, National Institute of Health Sciences, Kawasaki, Kanagawa, Japan
| | - Hideyuki Sakoda
- Division of Medical Devices, National Institute of Health Sciences, Kawasaki, Kanagawa, Japan
| | - Yuji Haishima
- Division of Medical Devices, National Institute of Health Sciences, Kawasaki, Kanagawa, Japan
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Lin C, Ren P, Li W, Deng H, Zhou Z. Finite‐element modelling of frictional behaviour between oesophagus and endoscope. BIOSURFACE AND BIOTRIBOLOGY 2020. [DOI: 10.1049/bsbt.2019.0034] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Affiliation(s)
- Chengxiong Lin
- Key Laboratory for Advanced Technology of Materials of Ministry of EducationTribology Research InstituteSouthwest Jiaotong UniversityChengdu610031People's Republic of China
| | - Pan Ren
- Key Laboratory for Advanced Technology of Materials of Ministry of EducationTribology Research InstituteSouthwest Jiaotong UniversityChengdu610031People's Republic of China
| | - Wei Li
- Key Laboratory for Advanced Technology of Materials of Ministry of EducationTribology Research InstituteSouthwest Jiaotong UniversityChengdu610031People's Republic of China
| | - Hengyi Deng
- Department of General SurgeryChengdu Second People's HospitalChengdu610017People's Republic of China
| | - Zhongrong Zhou
- Key Laboratory for Advanced Technology of Materials of Ministry of EducationTribology Research InstituteSouthwest Jiaotong UniversityChengdu610031People's Republic of China
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11
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Chen C, Chen J, Wu W, Shi Y, Jin L, Petrini L, Shen L, Yuan G, Ding W, Ge J, Edelman ER, Migliavacca F. In vivo and in vitro evaluation of a biodegradable magnesium vascular stent designed by shape optimization strategy. Biomaterials 2019; 221:119414. [PMID: 31419654 PMCID: PMC6732791 DOI: 10.1016/j.biomaterials.2019.119414] [Citation(s) in RCA: 57] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2019] [Revised: 07/30/2019] [Accepted: 08/03/2019] [Indexed: 01/25/2023]
Abstract
The performance of biodegradable magnesium alloy stents (BMgS) requires special attention to non-uniform residual stress distribution and stress concentration, which can accelerate localized degradation after implantation. We now report on a novel concept in stent shape optimization using a finite element method (FEM) toolkit. A Mg-Nd-Zn-Zr alloy with uniform degradation behavior served as the basis of our BMgS. Comprehensive in vitro evaluations drove stent optimization, based on observed crimping and balloon inflation performance, measurement of radial strength, and stress condition validation via microarea-XRD. Moreover, a Rapamycin-eluting polymer coating was sprayed on the prototypical BMgS to improve the corrosion resistance and release anti-hyperplasia drugs. In vivo evaluation of the optimized coated BMgS was conducted in the iliac artery of New Zealand white rabbit with quantitative coronary angiography (QCA), optical coherence tomography (OCT) and micro-CT observation at 1, 3, 5-month follow-ups. Neither thrombus or early restenosis was observed, and the coated BMgS supported the vessel effectively prior to degradation and allowed for arterial healing thereafter. The proposed shape optimization framework based on FEM provides an novel concept in stent design and in-depth understanding of how deformation history affects the biomechanical performance of BMgS. Computational analysis tools can indeed promote the development of biodegradable magnesium stents.
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Affiliation(s)
- Chenxin Chen
- National Engineering Research Center of Light Alloy Net Forming & State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China; Laboratory of Biological Structure Mechanics (LaBS), Department of Chemistry, Materials and Chemical Engineering "Giulio Natta", Politecnico di Milano, Piazza Leonardo da Vinci, 32, Milan, 20133, Italy
| | - Jiahui Chen
- Shanghai Institute of Cardiovascular Diseases, Department of Cardiology, Zhongshan Hospital, Fudan University, Shanghai, 200032, China
| | - Wei Wu
- Laboratory of Biological Structure Mechanics (LaBS), Department of Chemistry, Materials and Chemical Engineering "Giulio Natta", Politecnico di Milano, Piazza Leonardo da Vinci, 32, Milan, 20133, Italy; Department of Mechanical Engineering, The University of Texas at San Antonio, One UTSA Circle, San Antonio, TX, 78249-0669, USA
| | - Yongjuan Shi
- National Engineering Research Center of Light Alloy Net Forming & State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China
| | - Liang Jin
- National Engineering Research Center of Light Alloy Net Forming & State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China
| | - Lorenza Petrini
- Department of Civil and Environmental Engineering, Politecnico di Milano, Piazza Leonardo da Vinci, 32, Milan, 20133, Italy
| | - Li Shen
- Shanghai Institute of Cardiovascular Diseases, Department of Cardiology, Zhongshan Hospital, Fudan University, Shanghai, 200032, China
| | - Guangyin Yuan
- National Engineering Research Center of Light Alloy Net Forming & State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China.
| | - Wenjiang Ding
- National Engineering Research Center of Light Alloy Net Forming & State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China
| | - Junbo Ge
- Shanghai Institute of Cardiovascular Diseases, Department of Cardiology, Zhongshan Hospital, Fudan University, Shanghai, 200032, China
| | - Elazer R Edelman
- Institute for Medical Engineering and Science, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA; Cardiovascular Division, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, 02115, USA
| | - Francesco Migliavacca
- Laboratory of Biological Structure Mechanics (LaBS), Department of Chemistry, Materials and Chemical Engineering "Giulio Natta", Politecnico di Milano, Piazza Leonardo da Vinci, 32, Milan, 20133, Italy.
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12
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Qiu TY, Zhao LG, Song M. A Computational Study of Mechanical Performance of Bioresorbable Polymeric Stents with Design Variations. Cardiovasc Eng Technol 2018; 10:46-60. [DOI: 10.1007/s13239-018-00397-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/04/2018] [Accepted: 11/30/2018] [Indexed: 10/27/2022]
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13
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Zhao F, Liu L, Yang Y, Wang F, Wang L. The Crimping and Expanding Performance of Self-Expanding Polymeric Bioresorbable Stents: Experimental and Computational Investigation. MATERIALS (BASEL, SWITZERLAND) 2018; 11:E2184. [PMID: 30400381 PMCID: PMC6266750 DOI: 10.3390/ma11112184] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/13/2018] [Revised: 10/31/2018] [Accepted: 11/01/2018] [Indexed: 11/29/2022]
Abstract
Abstract: Polymeric bioresorbable stents (PBRSs) are considered the most promising devices to treat cardiovascular diseases. However, the mechanical weakness still hampers their application. In general, PBRSs are crimped into small sheathes and re-expanded to support narrowed vessels during angioplasty. Accordingly, one of the most significant requirements of PBRSs is to maintain mechanical efficacy after implantation. Although a little research has focused on commercial balloon-expanding PBRSs, a near-total lack has appeared on self-expanding PBRSs and their deformation mechanisms. In this work, self-expanding, composite polymeric bioresorbable stents (cPBRSs) incorporating poly(p-dioxanone) (PPDO) and polycaprolactone (PCL) yarns were produced and evaluated for their in vitro crimping and expanding potential. Furthermore, the polymer time-reliable viscoelastic effects of the structural and mechanical behavior of the cPBRSs were analyzed using computational simulations. Our results showed that the crimping process inevitably decreased the mechanical resistance of the cPBRSs, but that this could be offset by balloon dilatation. Moreover, deformation mechanisms at the yarn level were discussed, and yarns bonded in the crossings showed more viscous behavior; this property might help cPBRSs to maintain their structural integrity during implantation.
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Affiliation(s)
- Fan Zhao
- College of Textiles, Donghua University, Shanghai 201620, China.
- Key laboratory of Textile Science and Technology, Ministry of Education, College of Textiles, Donghua University, Songjiang District, Shanghai 201620, China.
| | - Laijun Liu
- College of Textiles, Donghua University, Shanghai 201620, China.
- Key laboratory of Textile Science and Technology, Ministry of Education, College of Textiles, Donghua University, Songjiang District, Shanghai 201620, China.
| | - Yang Yang
- College of Textiles, Donghua University, Shanghai 201620, China.
| | - Fujun Wang
- College of Textiles, Donghua University, Shanghai 201620, China.
- Key laboratory of Textile Science and Technology, Ministry of Education, College of Textiles, Donghua University, Songjiang District, Shanghai 201620, China.
| | - Lu Wang
- College of Textiles, Donghua University, Shanghai 201620, China.
- Key laboratory of Textile Science and Technology, Ministry of Education, College of Textiles, Donghua University, Songjiang District, Shanghai 201620, China.
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14
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Biodegradable Polyvinyl Alcohol Vascular Stents: Structural Model and Mechanical and Biological Property Evaluation. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2018; 91:404-413. [DOI: 10.1016/j.msec.2018.05.030] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2017] [Revised: 04/20/2018] [Accepted: 05/07/2018] [Indexed: 12/31/2022]
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15
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SHEN XIANG, DENG YONGQUAN, JI SONG, XIE ZHONGMIN, ZHU HONGFEI. FLEXIBILITY BEHAVIOR OF CORONARY STENTS: THE ROLE OF LINKER INVESTIGATED WITH NUMERICAL SIMULATION. J MECH MED BIOL 2018. [DOI: 10.1142/s0219519417501123] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Flexibility is a vital property of stents and different stent structures lead to different flexibility behaviors. In this study, the finite element analysis was adopted and a virtual bending deformation was imposed to quantify the effects of linker pattern, linker number, bending direction and linker location on flexibility. Stent performance indicators, including stress distribution, deformation patterns and bending stiffness, were examined. Results indicate that higher levels of stresses are found on the linker struts, associated with much larger deformation. The linker number plays the most significant role in flexibility, and simply decreasing linker number could result in a sharp increase in flexibility and a decrease in stress. The linker pattern has great impact on stent flexibility, especially on the behavior of self-contact. Stents with different linker patterns could respond differently in the course of bending, and the stent with an offset peak-to-peak linker pattern is the best choice. It is also found that stent flexibility can be improved when fewer linkers lie in the compression area and the linker directions between two adjacent rows are consistent. The results obtained could provide useful information for the improvement of stent design and clinical choice.
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Affiliation(s)
- XIANG SHEN
- School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, P. R. China
| | - YONG-QUAN DENG
- School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, P. R. China
| | - SONG JI
- School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, P. R. China
| | - ZHONG-MIN XIE
- School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, P. R. China
| | - HONG-FEI ZHU
- School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, P. R. China
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16
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XU CHUANGYE, LIU XIUJIAN, PAN LIANQIANG, WU GUANGHUI, SHU LIXIA, HE YUNA, MA LIPING, LIN CHANGYAN. NUMERICAL ANALYSIS OF BALLOON EXPANDABLE STENT DEPLOYMENT INSIDE A PATIENT-SPECIFIC STENOTIC CORONARY ARTERY TO INVESTIGATE THE INSTANT MECHANICAL BEHAVIORS. J MECH MED BIOL 2017. [DOI: 10.1142/s0219519417400371] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The instant mechanical behaviors of stenotic coronary artery and deployed stents have significant impacts on percutaneous coronary intervention prognosis. However, they could not be obtained directly from the current examination techniques, which are commonly used in clinical practice. Thus, we intend to investigate the instantaneous mechanical behaviors of deployed stent and artery through virtually stenting technology based on a real clinical case in assessment of geometric and biomechanical characteristics. Method: Finite element analysis models, including rigid guide catheter, six-folded balloon with conical tip, crimped and bended stent, stenotic coronary artery with soft plaques, were simulated through virtual mechanical expansion and recoil procedure. The morphology changes of coronary lumen, strain and stress distribution of involved components at different stages and apposition of stent struts were analyzed. Results: Lumen in the stenotic region restored patency obviously at maximum expansion and had an elastic recoil about 13.5% later. The maximum principal stress distribution of artery walls and plaque was mainly concentrated in the stenotic segment with the peak value of 1.252[Formula: see text]MPa and 2.975[Formula: see text]MPa at max expansion, 0.713[Formula: see text]MPa and 1.25[Formula: see text]MPa after recoil, respectively. The higher von Mises stress and plastic equivalent strain of stent were present at the bended strut and inter-ring connectors with the peak value of 714.2[Formula: see text]MPa and 0.2385 at max expansion, 694[Formula: see text]MPa and 0.2276 after recoil. Slight malappositions were found in the proximal segment and struts distribution in the stenotic sites showed certain asymmetry. Conclusion: The instant mechanical behaviors of artery and stent could be evaluated through virtual stenting approach in assessment of geometric and biomechanical characteristics. This may contribute to choosing the best stenting schemes and predicting the clinical outcomes for a specific patient.
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Affiliation(s)
- CHUANGYE XU
- Department of Biomedical Engineering, Beijing Anzhen Hospital, Capital Medical University, Beijing 100029, P. R. China
- Department of Biomedical Engineering, Beijing Institute of Heart, Lung, and Blood Vessel Diseases, Beijing 100029, P. R. China
| | - XIUJIAN LIU
- Department of Biomedical Engineering, Beijing Anzhen Hospital, Capital Medical University, Beijing 100029, P. R. China
- Department of Biomedical Engineering, Beijing Institute of Heart, Lung, and Blood Vessel Diseases, Beijing 100029, P. R. China
| | - LIANQIANG PAN
- Department of Biomedical Engineering, Beijing Anzhen Hospital, Capital Medical University, Beijing 100029, P. R. China
- Department of Biomedical Engineering, Beijing Institute of Heart, Lung, and Blood Vessel Diseases, Beijing 100029, P. R. China
| | - GUANGHUI WU
- Department of Biomedical Engineering, Beijing Anzhen Hospital, Capital Medical University, Beijing 100029, P. R. China
- Department of Biomedical Engineering, Beijing Institute of Heart, Lung, and Blood Vessel Diseases, Beijing 100029, P. R. China
| | - LIXIA SHU
- Department of Biomedical Engineering, Beijing Anzhen Hospital, Capital Medical University, Beijing 100029, P. R. China
- Department of Biomedical Engineering, Beijing Institute of Heart, Lung, and Blood Vessel Diseases, Beijing 100029, P. R. China
| | - YUNA HE
- Department of Biomedical Engineering, Beijing Anzhen Hospital, Capital Medical University, Beijing 100029, P. R. China
- Department of Biomedical Engineering, Beijing Institute of Heart, Lung, and Blood Vessel Diseases, Beijing 100029, P. R. China
| | - LIPING MA
- General Practice, Beijing Anzhen Hospital, Capital Medical University, Beijing 100029, P. R. China
| | - CHANGYAN LIN
- Department of Biomedical Engineering, Beijing Anzhen Hospital, Capital Medical University, Beijing 100029, P. R. China
- Department of Biomedical Engineering, Beijing Institute of Heart, Lung, and Blood Vessel Diseases, Beijing 100029, P. R. China
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17
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Naseem R, Zhao L, Liu Y, Silberschmidt VV. Experimental and computational studies of poly-L-lactic acid for cardiovascular applications: recent progress. ACTA ACUST UNITED AC 2017. [DOI: 10.1186/s40759-017-0028-y] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
AbstractStents are commonly used in medical procedures to alleviate the symptoms of coronary heart disease, a prevalent modern society disease. These structures are employed to maintain vessel patency and restore blood flow. Traditionally stents are made of metals such as stainless steel or cobalt chromium; however, these scaffolds have known disadvantages. An emergence of transient scaffolds is gaining popularity, with the structure engaged for a required period whilst healing of the diseased arterial wall occurs. Polymers dominate a medical device sector, with incorporation in sutures, scaffolds and screws. Thanks to their good mechanical and biological properties and their ability to degrade naturally. Polylactic acid is an extremely versatile polymer, with its properties easily tailored to applications. Its dominance in the stenting field increases continually, with the first polymer scaffold gaining FDA approval in 2016. Still some challenges with PLLA bioresorbable materials remain, especially with regard to understanding their mechanical response, assessment of its changes with degradation and comparison of their performance with that of metallic drug-eluting stent. Currently, there is still a lack of works on evaluating both the pre-degradation properties and degradation performance of these scaffolds. Additionally, there are no established material models incorporating non-linear viscoelastic behaviour of PLLA and its evolution with in-service degradation. Assessing these features through experimental analysis accompanied by analytical and numerical studies will provide powerful tools for design and optimisation of these structures endorsing their broader use in stenting. This overview assesses the recent studies investigating mechanical and computational performance of poly(l-lactic) acid and its use in stenting applications.
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Lazim Z, Ismail AE, Taib I, Mohd Atan BA. A review of stent’s failure on patent ductus arteriosus. IOP CONFERENCE SERIES: MATERIALS SCIENCE AND ENGINEERING 2017; 165:012007. [DOI: 10.1088/1757-899x/165/1/012007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
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19
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Computational analysis of mechanical stress–strain interaction of a bioresorbable scaffold with blood vessel. J Biomech 2016; 49:2677-2683. [DOI: 10.1016/j.jbiomech.2016.05.035] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2016] [Revised: 04/27/2016] [Accepted: 05/30/2016] [Indexed: 11/20/2022]
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