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Ren C, Chang Z, Li K, Wang X, Wang D, Xu Y, Li X, Li Q. Impact of uniaxial cyclic stretching on matrix-associated endothelial cell responses. Mater Today Bio 2024; 27:101152. [PMID: 39104901 PMCID: PMC11298614 DOI: 10.1016/j.mtbio.2024.101152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2024] [Revised: 06/07/2024] [Accepted: 07/08/2024] [Indexed: 08/07/2024] Open
Abstract
Uniaxial cyclic stretching plays a pivotal role in the fields of tissue engineering and regenerative medicine, influencing cell behaviors and functionality based on physical properties, including matrix morphology and mechanical stimuli. This study delves into the response of endothelial cells to uniaxial cyclic strain within the geometric constraints of micro-nano fibers. Various structural scaffold forms of poly(l-lactide-co-caprolactone) (PLCL), such as flat membranes, randomly oriented fiber membranes, and aligned fiber membranes, were fabricated through solvent casting and electrospinning methods. Our investigation focuses on the morphological variation of endothelial cells under diverse geometric constraints and the mechanical-dependent release of nitric oxide (NO) on oriented fibrous membranes. Our results indicate that while uniaxial cyclic stretching promotes endothelial cell spreading, the anisotropy of the matrix morphology remains the primary driving factor for cell alignment. Additionally, uniaxial cyclic stretching significantly enhances NO release, with a notably stronger effect correlated to the increasing strain amplitude. Importantly, this study reveals that uniaxial cyclic stretching enhances the mRNA expression of key proteins, including talin, vinculin, rac, and nitric oxide synthase (eNOS).
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Affiliation(s)
- Cuihong Ren
- School of Mechanics and Safety Engineering, Zhengzhou University, Zhengzhou, 450001, PR China
- National Center for International Research of Micro-Nano Molding Technology, Zhengzhou University, Zhengzhou, 450001, PR China
| | - Zhonghua Chang
- Institute of Laser Manufacturing, Henan Academy of Sciences, Zhengzhou, 450046, PR China
| | - Kecheng Li
- School of Mechanics and Safety Engineering, Zhengzhou University, Zhengzhou, 450001, PR China
- National Center for International Research of Micro-Nano Molding Technology, Zhengzhou University, Zhengzhou, 450001, PR China
| | - Xiaofeng Wang
- School of Mechanics and Safety Engineering, Zhengzhou University, Zhengzhou, 450001, PR China
- National Center for International Research of Micro-Nano Molding Technology, Zhengzhou University, Zhengzhou, 450001, PR China
| | - Dongfang Wang
- School of Mechanics and Safety Engineering, Zhengzhou University, Zhengzhou, 450001, PR China
- National Center for International Research of Micro-Nano Molding Technology, Zhengzhou University, Zhengzhou, 450001, PR China
| | - Yiyang Xu
- National Center for International Research of Micro-Nano Molding Technology, Zhengzhou University, Zhengzhou, 450001, PR China
| | - Xiaomeng Li
- School of Mechanics and Safety Engineering, Zhengzhou University, Zhengzhou, 450001, PR China
- National Center for International Research of Micro-Nano Molding Technology, Zhengzhou University, Zhengzhou, 450001, PR China
| | - Qian Li
- School of Mechanics and Safety Engineering, Zhengzhou University, Zhengzhou, 450001, PR China
- National Center for International Research of Micro-Nano Molding Technology, Zhengzhou University, Zhengzhou, 450001, PR China
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2
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Lu X, Zou H, Liao X, Xiong Y, Hu X, Cao J, Pan J, Li C, Zheng Y. Construction of PCL-collagen@PCL@PCL-gelatin three-layer small diameter artificial vascular grafts by electrospinning. Biomed Mater 2022; 18. [PMID: 36374009 DOI: 10.1088/1748-605x/aca269] [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: 07/23/2022] [Accepted: 11/14/2022] [Indexed: 11/16/2022]
Abstract
The demand for artificial vascular grafts in clinical applications is increasing, and it is urgent to design a tissue-engineered vascular graft with good biocompatibility and sufficient mechanical strength. In this study, three-layer small diameter artificial vascular grafts were constructed by electrospinning. Polycaprolactone (PCL) and collagen (COL) were used as the inner layer to provide good biocompatibility and cell adhesion, the middle layer was PCL to improve the mechanical properties, and gelatin (GEL) and PCL were used to construct the outer layer for further improving the mechanical properties and biocompatibility of the vascular grafts in the human body environment. The electrospun artificial vascular graft had good biocompatibility and mechanical properties. Its longitudinal maximum stress reached 2.63 ± 0.12 MPa, which exceeded the maximum stress that many natural blood vessels could withstand. The fiber diameter of the vascular grafts was related to the proportion of components that made up the vascular grafts. In the inner structure of the vascular grafts, the hydrophilicity of the vascular grafts was enhanced by the addition of COL to the PCL, and human umbilical vein endothelial cells (HUVECs) adhered more easily to the vascular grafts. In particular, the cytocompatibility and proliferation of HUVECs on the scaffold with an inner structure PCL:COL = 2:1 was superior to other ratios of vascular grafts. The vascular grafts did not cause hemolysis of red blood cells. Thus, the bionic PCL-COL@PCL@PCL-GEL composite graft is a promising material for vascular tissue engineering.
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Affiliation(s)
- Xingjian Lu
- Department of Physics, and Key Laboratory of ATMMT Ministry of Education, Zhejiang Sci-Tech University, Hangzhou 310018, People's Republic of China
| | - Hao Zou
- Department of Physics, and Key Laboratory of ATMMT Ministry of Education, Zhejiang Sci-Tech University, Hangzhou 310018, People's Republic of China
| | - Xiaokun Liao
- Department of Physics, and Key Laboratory of ATMMT Ministry of Education, Zhejiang Sci-Tech University, Hangzhou 310018, People's Republic of China
| | - Yue Xiong
- Department of Physics, and Key Laboratory of ATMMT Ministry of Education, Zhejiang Sci-Tech University, Hangzhou 310018, People's Republic of China
| | - Xiaoyan Hu
- Department of Physics, and Key Laboratory of ATMMT Ministry of Education, Zhejiang Sci-Tech University, Hangzhou 310018, People's Republic of China
| | - Jun Cao
- Department of Physics, and Key Laboratory of ATMMT Ministry of Education, Zhejiang Sci-Tech University, Hangzhou 310018, People's Republic of China
| | - Jiaqi Pan
- Department of Physics, and Key Laboratory of ATMMT Ministry of Education, Zhejiang Sci-Tech University, Hangzhou 310018, People's Republic of China
| | - Chaorong Li
- Department of Physics, and Key Laboratory of ATMMT Ministry of Education, Zhejiang Sci-Tech University, Hangzhou 310018, People's Republic of China
| | - Yingying Zheng
- Department of Physics, and Key Laboratory of ATMMT Ministry of Education, Zhejiang Sci-Tech University, Hangzhou 310018, People's Republic of China
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3
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Small Diameter Cell-Free Tissue-Engineered Vascular Grafts: Biomaterials and Manufacture Techniques to Reach Suitable Mechanical Properties. Polymers (Basel) 2022; 14:polym14173440. [PMID: 36080517 PMCID: PMC9460130 DOI: 10.3390/polym14173440] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2022] [Revised: 07/06/2022] [Accepted: 07/06/2022] [Indexed: 12/25/2022] Open
Abstract
Vascular grafts (VGs) are medical devices intended to replace the function of a blood vessel. Available VGs in the market present low patency rates for small diameter applications setting the VG failure. This event arises from the inadequate response of the cells interacting with the biomaterial in the context of operative conditions generating chronic inflammation and a lack of regenerative signals where stenosis or aneurysms can occur. Tissue Engineered Vascular grafts (TEVGs) aim to induce the regeneration of the native vessel to overcome these limitations. Besides the biochemical stimuli, the biomaterial and the particular micro and macrostructure of the graft will determine the specific behavior under pulsatile pressure. The TEVG must support blood flow withstanding the exerted pressure, allowing the proper compliance required for the biomechanical stimulation needed for regeneration. Although the international standards outline the specific requirements to evaluate vascular grafts, the challenge remains in choosing the proper biomaterial and manufacturing TEVGs with good quality features to perform satisfactorily. In this review, we aim to recognize the best strategies to reach suitable mechanical properties in cell-free TEVGs according to the reported success of different approaches in clinical trials and pre-clinical trials.
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4
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Arima T, Otsuka S, Mitsuoka H, Nakano T, Naito M, Ishibashi H. Site-specific mechanical properties of the human great saphenous vein: Cadaveric comparisons among the thigh, knee, and lower leg harvest sites. Phlebology 2022; 37:445-451. [DOI: 10.1177/02683555221088103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Background This study aimed to determine site-specific mechanical properties of the great saphenous vein (GSV) harvested from various sites in the same cadaver. Methods GSV samples were harvested from three sites: the thigh, knee, and lower leg. The thickness and diameter of the samples were measured, and the tensile test was performed to measure stiffness and Young’s modulus. Results The stiffness of the GSV harvested from knees in the longitudinal direction was lower than those from other sites, whereas the stiffness of the GSV harvested from the lower leg in the circumferential direction was lower than that from the thigh. Conclusions The GSV has site-specific mechanical properties. Thus, in addition to morphological evaluations such as echo and computed tomography in preoperative graft surgical evaluations, knowledge of the mechanical properties at each site can improve the patency rate and prevent aneurysmal expansion.
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Affiliation(s)
- Takahiro Arima
- Department of Vascular Surgery, Aichi Medical University, Aichi, Japan
| | - Shun Otsuka
- Department of Anatomy, Aichi Medical University, Aichi, Japan
| | - Hiroki Mitsuoka
- Department of Vascular Surgery, Aichi Medical University, Aichi, Japan
| | - Takashi Nakano
- Department of Anatomy, Aichi Medical University, Aichi, Japan
| | - Munekazu Naito
- Department of Anatomy, Aichi Medical University, Aichi, Japan
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5
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Chan D, Chien JC, Axpe E, Blankemeier L, Baker SW, Swaminathan S, Piunova VA, Zubarev DY, Maikawa CL, Grosskopf AK, Mann JL, Soh HT, Appel EA. Combinatorial Polyacrylamide Hydrogels for Preventing Biofouling on Implantable Biosensors. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022. [PMID: 35390209 DOI: 10.1101/2020.05.25.115675] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Biofouling on the surface of implanted medical devices and biosensors severely hinders device functionality and drastically shortens device lifetime. Poly(ethylene glycol) and zwitterionic polymers are currently considered "gold-standard" device coatings to reduce biofouling. To discover novel anti-biofouling materials, a combinatorial library of polyacrylamide-based copolymer hydrogels is created, and their ability is screened to prevent fouling from serum and platelet-rich plasma in a high-throughput parallel assay. It is found that certain nonintuitive copolymer compositions exhibit superior anti-biofouling properties over current gold-standard materials, and machine learning is used to identify key molecular features underpinning their performance. For validation, the surfaces of electrochemical biosensors are coated with hydrogels and their anti-biofouling performance in vitro and in vivo in rodent models is evaluated. The copolymer hydrogels preserve device function and enable continuous measurements of a small-molecule drug in vivo better than gold-standard coatings. The novel methodology described enables the discovery of anti-biofouling materials that can extend the lifetime of real-time in vivo sensing devices.
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Affiliation(s)
- Doreen Chan
- Department of Chemistry, Stanford University, Stanford, CA, 94305, USA
| | - Jun-Chau Chien
- Department of Electrical Engineering, Stanford University, Stanford, CA, 94305, USA
| | - Eneko Axpe
- Department of Materials Science and Engineering, Stanford University, Stanford, CA, 94305, USA
| | - Louis Blankemeier
- Department of Electrical Engineering, Stanford University, Stanford, CA, 94305, USA
| | - Samuel W Baker
- Department of Comparative Medicine, Stanford University, Stanford, CA, 94305, USA
| | | | | | | | - Caitlin L Maikawa
- Department of Bioengineering, Stanford University, Stanford, CA, 94305, USA
| | - Abigail K Grosskopf
- Department of Chemical Engineering, Stanford University, Stanford, CA, 94305, USA
| | - Joseph L Mann
- Department of Materials Science and Engineering, Stanford University, Stanford, CA, 94305, USA
| | - H Tom Soh
- Department of Electrical Engineering, Stanford University, Stanford, CA, 94305, USA
- ChEM-H Institute, Stanford University, Stanford, CA, 94304, USA
- Chan Zuckerberg Biohub, San Francisco, CA, 94158, USA
| | - Eric A Appel
- Department of Materials Science and Engineering, Stanford University, Stanford, CA, 94305, USA
- Department of Bioengineering, Stanford University, Stanford, CA, 94305, USA
- ChEM-H Institute, Stanford University, Stanford, CA, 94304, USA
- Department of Pediatrics - Endocrinology, Stanford University School of Medicine, Stanford, CA, 94305, USA
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6
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Chan D, Chien JC, Axpe E, Blankemeier L, Baker SW, Swaminathan S, Piunova VA, Zubarev DY, Maikawa CL, Grosskopf AK, Mann JL, Soh HT, Appel EA. Combinatorial Polyacrylamide Hydrogels for Preventing Biofouling on Implantable Biosensors. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2109764. [PMID: 35390209 PMCID: PMC9793805 DOI: 10.1002/adma.202109764] [Citation(s) in RCA: 33] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Revised: 04/04/2022] [Indexed: 05/29/2023]
Abstract
Biofouling on the surface of implanted medical devices and biosensors severely hinders device functionality and drastically shortens device lifetime. Poly(ethylene glycol) and zwitterionic polymers are currently considered "gold-standard" device coatings to reduce biofouling. To discover novel anti-biofouling materials, a combinatorial library of polyacrylamide-based copolymer hydrogels is created, and their ability is screened to prevent fouling from serum and platelet-rich plasma in a high-throughput parallel assay. It is found that certain nonintuitive copolymer compositions exhibit superior anti-biofouling properties over current gold-standard materials, and machine learning is used to identify key molecular features underpinning their performance. For validation, the surfaces of electrochemical biosensors are coated with hydrogels and their anti-biofouling performance in vitro and in vivo in rodent models is evaluated. The copolymer hydrogels preserve device function and enable continuous measurements of a small-molecule drug in vivo better than gold-standard coatings. The novel methodology described enables the discovery of anti-biofouling materials that can extend the lifetime of real-time in vivo sensing devices.
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Affiliation(s)
- Doreen Chan
- Department of Chemistry, Stanford University, Stanford, CA, 94305, USA
| | - Jun-Chau Chien
- Department of Electrical Engineering, Stanford University, Stanford, CA, 94305, USA
| | - Eneko Axpe
- Department of Materials Science and Engineering, Stanford University, Stanford, CA, 94305, USA
| | - Louis Blankemeier
- Department of Electrical Engineering, Stanford University, Stanford, CA, 94305, USA
| | - Samuel W Baker
- Department of Comparative Medicine, Stanford University, Stanford, CA, 94305, USA
| | | | | | | | - Caitlin L Maikawa
- Department of Bioengineering, Stanford University, Stanford, CA, 94305, USA
| | - Abigail K Grosskopf
- Department of Chemical Engineering, Stanford University, Stanford, CA, 94305, USA
| | - Joseph L Mann
- Department of Materials Science and Engineering, Stanford University, Stanford, CA, 94305, USA
| | - H Tom Soh
- Department of Electrical Engineering, Stanford University, Stanford, CA, 94305, USA
- ChEM-H Institute, Stanford University, Stanford, CA, 94304, USA
- Chan Zuckerberg Biohub, San Francisco, CA, 94158, USA
| | - Eric A Appel
- Department of Materials Science and Engineering, Stanford University, Stanford, CA, 94305, USA
- Department of Bioengineering, Stanford University, Stanford, CA, 94305, USA
- ChEM-H Institute, Stanford University, Stanford, CA, 94304, USA
- Department of Pediatrics - Endocrinology, Stanford University School of Medicine, Stanford, CA, 94305, USA
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7
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Li N, Ferracane J, Andeen N, Lewis S, Woltjer R, Rugonyi S, Jahangiri Y, Uchida B, Farsad K, Kaufman JA, Al-Hakim R. Endovascular Venous Stenosis and Thrombosis Large Animal Model: angiographic, histological, and biomechanical characterization. J Vasc Interv Radiol 2021; 33:255-261.e2. [PMID: 34915165 DOI: 10.1016/j.jvir.2021.10.036] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2021] [Revised: 09/20/2021] [Accepted: 10/03/2021] [Indexed: 10/19/2022] Open
Abstract
PURPOSE Characterize an ovine endovascular radiofrequency ablation based venous stenosis and thrombosis model for studying venous biomechanics and response to intervention. MATERIALS AND METHODS Unilateral short-segment (n= 2) or long-segment (n = 6) iliac vein stenoses were created in eight adult sheep using an endovenous radiofrequency (RF) ablation technique. Angiographic assessment was performed at baseline, immediately after venous stenosis creation, and after 2-week (n = 6) or 3-month (n = 2) survival. Stenosed iliac veins and contralateral healthy controls were harvested for histological and biomechanical assessment. RESULTS At follow-up, the short-segment RF ablation group showed stable stenosis without occlusion. The long-segment group showed complete venous occlusion/thrombosis with formation of collateral veins. Stenosed veins showed significant wall thickening (0.28 mm vs 0.16 mm; p = 0.0175) and confluent collagen deposition compared to healthy controls. Subacute non-adherent thrombi were apparent at 2 weeks, which were replaced by fibrous luminal obliteration with channels of recanalization at 3 months. Stenosed veins demonstrated increased longitudinal stiffness (448.5 ± 5.4 kPa vs. 314.6 ± 1.5 kPa, p < 0.0001) and decreased circumferential stiffness (140.8 ± 2.6 kPa vs. 246.0 ± 1.6 kPa, p < 0.0001) compared to healthy controls. CONCLUSION Endovenous radiofrequency ablation is a reliable technique for creating venous stenosis and thrombosis in a large animal model with histological and biomechanical attributes similar to those seen in humans. This platform can facilitate understanding of venous biomechanics and testing of venous specific devices and interventions.
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Affiliation(s)
- Ningcheng Li
- Dotter Interventional Institute, Oregon Health & Science University
| | - Jack Ferracane
- School of Dentistry, Oregon Health & Science University; Biomaterials and Biomechanics, Oregon Health & Science University
| | | | - Steven Lewis
- School of Dentistry, Oregon Health & Science University; Biomaterials and Biomechanics, Oregon Health & Science University
| | | | - Sandra Rugonyi
- Biomedical Engineering, Oregon Health & Science University
| | - Younes Jahangiri
- Dotter Interventional Institute, Oregon Health & Science University
| | - Barry Uchida
- Dotter Interventional Institute, Oregon Health & Science University
| | - Khashayar Farsad
- Dotter Interventional Institute, Oregon Health & Science University
| | - John A Kaufman
- Dotter Interventional Institute, Oregon Health & Science University
| | - Ramsey Al-Hakim
- Dotter Interventional Institute, Oregon Health & Science University.
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8
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Wan Y, Yang S, Peng M, Gama M, Yang Z, Deng X, Zhou J, Ouyang C, Luo H. Controllable synthesis of biomimetic nano/submicro-fibrous tubes for potential small-diameter vascular grafts. J Mater Chem B 2021; 8:5694-5706. [PMID: 32510089 DOI: 10.1039/d0tb01002b] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Mimicking the morphological structure of native blood vessels is critical for the development of vascular grafts. Herein, small-diameter composite vascular grafts that integrate the nanofibrous bacterial cellulose (BC) and submicrofibrous cellulose acetate (CA) were fabricated via a combined electrospinning and step-by-step in situ biosynthesis. Scanning electron microscopy (SEM) observation shows the nano/submicro-fibrous morphology and well-interconnected porous structure of the BC/CA grafts. It is found that the BC/CA graft with a suitable BC content demonstrates lower potential of thrombus formation and enhanced endothelialization as compared to the BC and CA counterparts. Western blotting and RT-qPCR results suggest that the BC/CA-2 graft promotes endothelialization by improving expressions of genes vWF-1 and CD31 and protein CD31. The in vivo tests demonstrate much lower inflammatory response to the BC/CA graft. These results suggest that the BC/CA graft shows a great potential as an artificial graft for rapid formation of an endothelial cell monolayer.
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Affiliation(s)
- Yizao Wan
- Jiangxi Key Laboratory of Nanobiomaterials, Institute of Advanced Materials, East China Jiaotong University, Nanchang 330013, China. and School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China
| | - Shanshan Yang
- Jiangxi Key Laboratory of Nanobiomaterials, Institute of Advanced Materials, East China Jiaotong University, Nanchang 330013, China.
| | - Mengxia Peng
- Jiangxi Key Laboratory of Nanobiomaterials, Institute of Advanced Materials, East China Jiaotong University, Nanchang 330013, China.
| | - Miguel Gama
- Centro de Engenharia Biológica, Universidade do Minho, Campus de Gualtar, P 4715-057 Braga, Portugal
| | - Zhiwei Yang
- Jiangxi Key Laboratory of Nanobiomaterials, Institute of Advanced Materials, East China Jiaotong University, Nanchang 330013, China.
| | - Xiaoyan Deng
- Jiangxi Key Laboratory of Nanobiomaterials, Institute of Advanced Materials, East China Jiaotong University, Nanchang 330013, China. and Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing 100083, China
| | - Jianye Zhou
- State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100037, China
| | - Chenxi Ouyang
- Department of Vascular Surgery, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100037, China
| | - Honglin Luo
- Jiangxi Key Laboratory of Nanobiomaterials, Institute of Advanced Materials, East China Jiaotong University, Nanchang 330013, China. and School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China
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9
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Jin H, Landauer AK, Kim KS. Ruga mechanics of soft-orifice closure under external pressure. Proc Math Phys Eng Sci 2021. [DOI: 10.1098/rspa.2021.0238] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Here, we report the closure resistance of a soft-material bilayer orifice increases against external pressure, along with ruga-phase evolution, in contrast to the conventional predictions of the matrix-free cylindrical-shell buckling pressure. Experiments demonstrate that the generic soft-material orifice creases in a threefold symmetry at a
limit-load
pressure of
p
/
μ
≈ 1.20, where
μ
is the shear modulus. Once the creasing initiates, the triple crease wings gradually grow as the pressure increases until the orifice completely closes at
p
/
μ
≈ 3.0. By contrast, a stiff-surface bilayer orifice initially wrinkles with a multifold symmetry mode and subsequently develops ruga-phase evolution, progressively reducing the orifice cross-sectional area as pressure increases. The buckling-initiation mode is determined by the layer's thickness and stiffness, and the pressure by two types of the layer's instability modes—the surface-layer-wrinkling mode for a compliant and the ring-buckling mode for a stiff layer. The ring-buckling mode tends to set the twofold symmetry for the entire post-buckling closure process, while the high-frequency surface-layer-wrinkling mode evolves with successive symmetry breaking to a final closure configuration of two- or threefold symmetry. Finally, we found that the threefold symmetry mode for the entire closure process provides the orifice's strongest closure resistance, and human saphenous veins remarkably follow this threefold symmetry ruga evolution pathway.
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Affiliation(s)
- Hanxun Jin
- School of Engineering, Brown University, Providence, RI 02912, USA
| | | | - Kyung-Suk Kim
- School of Engineering, Brown University, Providence, RI 02912, USA
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10
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Wertheimer S, Sharabi M, Shelah O, Lesman A, Haj-Ali R. Bio-composites reinforced with unique coral collagen fibers: Towards biomimetic-based small diameter vascular grafts. J Mech Behav Biomed Mater 2021; 119:104526. [PMID: 33894525 DOI: 10.1016/j.jmbbm.2021.104526] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Revised: 03/15/2021] [Accepted: 04/09/2021] [Indexed: 01/01/2023]
Abstract
Cardiovascular Diseases (CVDs) are the leading cause of death worldwide. Approximately 31% of all global deaths are caused by CVDs, of which 42% are attributable to coronary artery disease (CAD). CAD is characterized by a narrowing of arteries that restricts the normal blood flow. Over time, surgical intervention is required in severe cases of occlusions and includes implantation of autologous vessels. Today synthetic grafts are used successfully as replacements for blood vessels with a diameter larger than 6 mm. However, they often fail as small-diameter blood vessel replacements. This study introduces a new biocomposite material system consisting of unique and long (cm-scale) collagen fibers derived from soft corals embedded within an alginate hydrogel matrix. The new biocomposite layers were used to fabricate grafts, towards developing a new class of tissue-engineered small-diameter blood vessels. These constructs consisted of both circumferentially and longitudinally oriented collagen fibers. The mechanical properties of the grafts were investigated via a new experimental setup constructed in our lab for this purpose, which applied internal pressure levels of 0-300 mmHg. Similar to native coronary arteries, the biocomposite tubes demonstrated a compliance of 4.88 ± 0.99%/100 mmHg for a physiologic pressure range of 80-120 mmHg. Furthermore, a numerical finite element simulation model is proposed to generate the overall mechanical response of the construct. It is composed of axial and circumferential fibers embedded within the continuum alginate elements. Good prediction is demonstrated when compared with the measured pressure-strain response. Moreover, we examined biocompatibility and cell growth on the collagen fibers. Fibroblast cells proliferated during the experiment that lasted for 32 days and showed aligned configuration with the collagen fiber orientation. The novelty of this study is manifested in the use of naturally derived coral-based long collagen fibers for the development of a new class of tissue-engineered grafts. The proposed novel biocomposite graft demonstrated both mechanical and biological compatibility and can be further developed for small-diameter blood-vessel replacement.
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Affiliation(s)
- Shir Wertheimer
- The Fleischman Faculty of Engineering, Tel Aviv University, Tel Aviv, 69978, Israel
| | - Mirit Sharabi
- The Faculty of Engineering, Ariel University, Ariel, 407000, Israel
| | - Ortal Shelah
- The Fleischman Faculty of Engineering, Tel Aviv University, Tel Aviv, 69978, Israel
| | - Ayelet Lesman
- The Fleischman Faculty of Engineering, Tel Aviv University, Tel Aviv, 69978, Israel
| | - Rami Haj-Ali
- The Fleischman Faculty of Engineering, Tel Aviv University, Tel Aviv, 69978, Israel.
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11
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Jiang C, Wang K, Liu Y, Zhang C, Wang B. Using Wet Electrospun PCL/Gelatin/CNT Yarns to Fabricate Textile-Based Scaffolds for Vascular Tissue Engineering. ACS Biomater Sci Eng 2021; 7:2627-2637. [PMID: 33821604 DOI: 10.1021/acsbiomaterials.1c00097] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Incorporating conductive materials in scaffolds has shown advantages in regulating adhesion, mitigation, and proliferation of electroactive cells for tissue engineering applications. Among various conductive materials, carbon nanotubes (CNTs) have shown great promises in tissue engineering because of their good mechanical properties. However, the broad application of CNTs in tissue engineering is limited by current methods to incorporate CNTs in polymers that require miscible solvents to dissolve CNTs and polymers or CNT surface modification. These methods either limit polymer selections or adversely affect the properties of polymer/CNT composites. Here, we report a novel method to fabricate polymer/CNT composite yarns by electrospinning polycaprolactone/gelatin into a bath of CNT dispersion and extracting electrospun fibers out of the bath. The concentration of CNTs in the bath affects the thermal and mechanical properties and the yarns' degradation behavior. In vitro biological test results show that within a limited range of CNT concentrations in the bath, the yarns exhibit good biocompatibility and the ability to guide cell elongation and alignment. We also report the design and fabrication of a vascular scaffold by knitting the yarns into a textile fabric and combining the textile fabric with gelatin. The scaffold has similar mechanical properties to native vessels and supports cell proliferation. This work demonstrates that the wet electrospun polymer/CNT yarns are good candidates for constructing vascular scaffolds and provides a novel method to incorporate CNTs or other functional materials into biopolymers for tissue engineering applications.
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Affiliation(s)
- Chen Jiang
- School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Dr NW, Atlanta 30332, Georgia, United States.,Georgia Tech Manufacturing Institute, Callaway Manufacturing Research Center Building, 813 Ferst Dr NW, Atlanta 30332, Georgia, United States
| | - Kan Wang
- Georgia Tech Manufacturing Institute, Callaway Manufacturing Research Center Building, 813 Ferst Dr NW, Atlanta 30332, Georgia, United States
| | - Yi Liu
- Georgia Tech Manufacturing Institute, Callaway Manufacturing Research Center Building, 813 Ferst Dr NW, Atlanta 30332, Georgia, United States.,School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, North Ave NW, Atlanta 30332, Georgia, United States
| | - Chuck Zhang
- Georgia Tech Manufacturing Institute, Callaway Manufacturing Research Center Building, 813 Ferst Dr NW, Atlanta 30332, Georgia, United States.,H. Milton Stewart School of Industrial and System Engineering, Georgia Institute of Technology, 755 Ferst Dr NW, Atlanta 30332, Georgia, United States
| | - Ben Wang
- School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Dr NW, Atlanta 30332, Georgia, United States.,Georgia Tech Manufacturing Institute, Callaway Manufacturing Research Center Building, 813 Ferst Dr NW, Atlanta 30332, Georgia, United States.,H. Milton Stewart School of Industrial and System Engineering, Georgia Institute of Technology, 755 Ferst Dr NW, Atlanta 30332, Georgia, United States
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12
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Zaccaria A, Migliavacca F, Contassot D, Heim F, Chakfe N, Pennati G, Petrini L. Finite Element Simulations of the ID Venous System to Treat Venous Compression Disorders: From Model Validation to Realistic Implant Prediction. Ann Biomed Eng 2021; 49:1493-1506. [PMID: 33398616 PMCID: PMC8137589 DOI: 10.1007/s10439-020-02694-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Accepted: 11/13/2020] [Indexed: 12/17/2022]
Abstract
The ID Venous System is an innovative device proposed by ID NEST MEDICAL to treat venous compression disorders that involve bifurcations, such as the May-Thurner syndrome. The system consists of two components, ID Cav and ID Branch, combined through a specific connection that prevents the migration acting locally on the pathological region, thereby preserving the surrounding healthy tissues. Preliminary trials are required to ensure the safety and efficacy of the device, including numerical simulations. In-silico models are intended to corroborate experimental data, providing additional local information not acquirable by other means. The present work outlines the finite element model implementation and illustrates a sequential validation process, involving seven tests of increasing complexity to assess the impact of each numerical uncertainty separately. Following the standard ASME V&V40, the computational results were compared with experimental data in terms of force-displacement curves and deformed configurations, testing the model reliability for the intended context of use (differences < 10%). The deployment in a realistic geometry confirmed the feasibility of the implant procedure, without risk of rupture or plasticity of the components, highlighting the potential of the present technology.
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Affiliation(s)
- Alissa Zaccaria
- LaBS, Department of Chemistry Materials and Chemical Engineering, Politecnico di Milano, Milan, Italy
| | - Francesco Migliavacca
- LaBS, Department of Chemistry Materials and Chemical Engineering, Politecnico di Milano, Milan, Italy
| | | | - Frederic Heim
- Laboratoire de Physique et Mécanique Textiles (LPMT), Université de Haute-Alsace, Mulhouse, France.,Groupe Européen De Recherche Sur Les Prothèses Appliquées À La Chirurgie Vasculaire (GEPROVAS), Strasbourg, France
| | - Nabil Chakfe
- Groupe Européen De Recherche Sur Les Prothèses Appliquées À La Chirurgie Vasculaire (GEPROVAS), Strasbourg, France.,Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - Giancarlo Pennati
- LaBS, Department of Chemistry Materials and Chemical Engineering, Politecnico di Milano, Milan, Italy
| | - Lorenza Petrini
- Department of Civil and Environmental Engineering, Politecnico di Milano, Milano, Italy.
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13
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Walsh DR, Lynch JJ, O' Connor DT, Newport DT, Mulvihill JJE. Mechanical and structural characterisation of the dural venous sinuses. Sci Rep 2020; 10:21763. [PMID: 33303894 PMCID: PMC7729903 DOI: 10.1038/s41598-020-78694-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Accepted: 11/26/2020] [Indexed: 12/27/2022] Open
Abstract
The dural venous sinuses play an integral role in draining venous blood from the cranial cavity. As a result of the sinuses anatomical location, they are of significant importance when evaluating the mechanopathology of traumatic brain injury (TBI). Despite the importance of the dural venous sinuses in normal neurophysiology, no mechanical analyses have been conducted on the tissues. In this study, we conduct mechanical and structural analysis on porcine dural venous sinus tissue to help elucidate the tissues’ function in healthy and diseased conditions. With longitudinal elastic moduli values ranging from 33 to 58 MPa, we demonstrate that the sinuses exhibit higher mechanical stiffness than that of native dural tissue, which may be of interest to the field of TBI modelling. Furthermore, by employing histological staining and a colour deconvolution protocol, we show that the sinuses have a collagen-dominant extracellular matrix, with collagen area fractions ranging from 84 to 94%, which likely explains the tissue’s large mechanical stiffness. In summary, we provide the first investigation of the dural venous sinus mechanical behaviour with accompanying structural analysis, which may aid in understanding TBI mechanopathology.
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Affiliation(s)
- Darragh R Walsh
- Bernal Institute, University of Limerick, Limerick, Ireland.,School of Engineering, University of Limerick, Limerick, Ireland
| | - James J Lynch
- Bernal Institute, University of Limerick, Limerick, Ireland.,School of Engineering, University of Limerick, Limerick, Ireland
| | - David T O' Connor
- Bernal Institute, University of Limerick, Limerick, Ireland.,School of Engineering, University of Limerick, Limerick, Ireland.,Health Research Institute, University of Limerick, Limerick, Ireland
| | - David T Newport
- Bernal Institute, University of Limerick, Limerick, Ireland.,School of Engineering, University of Limerick, Limerick, Ireland
| | - John J E Mulvihill
- Bernal Institute, University of Limerick, Limerick, Ireland. .,School of Engineering, University of Limerick, Limerick, Ireland. .,Health Research Institute, University of Limerick, Limerick, Ireland.
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14
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Pooria A, Pourya A, Gheini A. Application of tissue-engineered interventions for coronary artery bypass grafts. Future Cardiol 2020; 16:675-685. [PMID: 32643391 DOI: 10.2217/fca-2019-0050] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Coronary artery bypass graft is one of the extensively conducted procedures to release occlusion in the coronary vessel. Various biological grafts are used for this purpose, superiorly, saphenous vein graft, if unavailable, other vessels in the body, with likewise characteristics are exploited for the purpose. The choice of graft is yet under discovery that could impeccably meet all the requirements. Variation in perioperative and postoperative results have given uneven clinical inferences of these conduits. Alternatively, tissue-engineering is also being applied in this area for clinical improvements. This review underlines some of the commonly used grafts for coronary artery bypass graft and advancements in tissue engineering for this purpose.
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Affiliation(s)
- Ali Pooria
- Department of Cardiology, Lorestan University of Medical Sciences, Khorramabad, Iran
| | - Afsoun Pourya
- Student of Research Committee, Tehran University of Medical Sciences, Tehran, Iran
| | - Alireza Gheini
- Department of Cardiology, Lorestan University of Medical Sciences, Khorramabad, Iran
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15
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Turin SY, Fracol M, Keller E, Markl M, Collins J, Krochmal D, Kim JYS. Gluteal Vein Anatomy: Location, Caliber, Impact of Patient Positioning, and Implications for Fat Grafting. Aesthet Surg J 2020; 40:642-649. [PMID: 31574144 DOI: 10.1093/asj/sjz260] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Deaths in gluteal autografting occur due to gluteal vein injuries, but data are lacking on the precise location and caliber of these veins. OBJECTIVES The authors sought to present the first in vivo study of gluteal vein anatomy utilizing magnetic resonance imaging. METHODS Magnetic resonance imaging venography of 16 volunteer hemi-sections was conducted in the supine, prone, prone with a bump (jack-knife), and left and right decubitus positions in 1 session after a single contrast administration. Caliber and course of the superior and inferior gluteal veins (SGV/IGV) were analyzed vs bony landmarks and position changes. RESULTS The SGV has a very short submuscular course before splitting into 2 smaller branches superolaterally. The IGV runs immediately deep to the gluteus maximus in the center of the buttock as a single large trunk, on average 56 mm deep (mean 27 mm of muscle belly and 30 mm subcutaneous fat). No intramuscular or subcutaneous branches greater than 2 mm were found. In the prone position, the IGV and SGV have an average caliber of 5.96 mm and 5.63 mm. Vessel caliber decreased by 21% and 27%, respectively, in the jack-knife position and by 14% and 15% in lateral decubitus. CONCLUSIONS The SGV and IGV are immediately deep to gluteus maximus approximately 6 cm deep with a caliber on the order of 6 mm in the prone position. The distribution of these vessels suggests there is no "safe zone" in the intramuscular or submuscular planes. The jackknife or lateral decubitus positions can decrease vein caliber by up to 27%, possibly reducing the risk of injury due to either traction or direct cannula impact.
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Affiliation(s)
- Sergey Y Turin
- Division of Plastic and Reconstructive Surgery, Northwestern University Feinberg School of Medicine, Chicago, IL
| | - Megan Fracol
- Division of Plastic and Reconstructive Surgery, Northwestern University Feinberg School of Medicine, Chicago, IL
| | - Eric Keller
- Department of Radiology, Stanford University, Stanford, CA
| | - Michael Markl
- Department of Radiology, Northwestern University Feinberg School of Medicine, Chicago, IL
| | | | | | - John Y S Kim
- Division of Plastic and Reconstructive Surgery, Northwestern University Feinberg School of Medicine, Chicago, IL
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16
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Wang D, Xu Y, Li Q, Turng LS. Artificial small-diameter blood vessels: materials, fabrication, surface modification, mechanical properties, and bioactive functionalities. J Mater Chem B 2020; 8:1801-1822. [PMID: 32048689 PMCID: PMC7155776 DOI: 10.1039/c9tb01849b] [Citation(s) in RCA: 70] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Cardiovascular diseases, especially ones involving narrowed or blocked blood vessels with diameters smaller than 6 millimeters, are the leading cause of death globally. Vascular grafts have been used in bypass surgery to replace damaged native blood vessels for treating severe cardio- and peripheral vascular diseases. However, autologous replacement grafts are not often available due to prior harvesting or the patient's health. Furthermore, autologous harvesting causes secondary injury to the patient at the harvest site. Therefore, artificial blood vessels have been widely investigated in the last several decades. In this review, the progress and potential outlook of small-diameter blood vessels (SDBVs) engineered in vitro are highlighted and summarized, including material selection and development, fabrication techniques, surface modification, mechanical properties, and bioactive functionalities. Several kinds of natural and synthetic polymers for artificial SDBVs are presented here. Commonly used fabrication techniques, such as extrusion and expansion, electrospinning, thermally induced phase separation (TIPS), braiding, 3D printing, hydrogel tubing, gas foaming, and a combination of these methods, are analyzed and compared. Different surface modification methods, such as physical immobilization, surface adsorption, plasma treatment, and chemical immobilization, are investigated and are compared here as well. Mechanical requirements of SDBVs are also reviewed for long-term service. In vitro biological functions of artificial blood vessels, including oxygen consumption, nitric oxide (NO) production, shear stress response, leukocyte adhesion, and anticoagulation, are also discussed. Finally, we draw conclusions regarding current challenges and attempts to identify future directions for the optimal combination of materials, fabrication methods, surface modifications, and biofunctionalities. We hope that this review can assist with the design, fabrication, and application of SDBVs engineered in vitro and promote future advancements in this emerging research field.
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Affiliation(s)
- Dongfang Wang
- Department of Mechanical Engineering, University of Wisconsin, Madison, WI, USA. and Wisconsin Institute for Discovery, University of Wisconsin, Madison, WI, USA and School of Mechanics and Engineering Science, Zhengzhou University, Zhengzhou 450001, P. R. China and National Center for International Research of Micro-Nano Molding Technology, Zhengzhou University, Zhengzhou 450001, P. R. China
| | - Yiyang Xu
- Department of Mechanical Engineering, University of Wisconsin, Madison, WI, USA. and Wisconsin Institute for Discovery, University of Wisconsin, Madison, WI, USA
| | - Qian Li
- School of Mechanics and Engineering Science, Zhengzhou University, Zhengzhou 450001, P. R. China and National Center for International Research of Micro-Nano Molding Technology, Zhengzhou University, Zhengzhou 450001, P. R. China
| | - Lih-Sheng Turng
- Department of Mechanical Engineering, University of Wisconsin, Madison, WI, USA. and Wisconsin Institute for Discovery, University of Wisconsin, Madison, WI, USA
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17
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Jia W, Li M, Weng H, Gu G, Chen Z. Design and comprehensive assessment of a biomimetic tri-layer tubular scaffold via biodegradable polymers for vascular tissue engineering applications. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2020; 110:110717. [PMID: 32204029 DOI: 10.1016/j.msec.2020.110717] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Revised: 12/29/2019] [Accepted: 02/02/2020] [Indexed: 11/26/2022]
Abstract
Considering the structural complexity of the native artery wall and the limitations of current treatment strategies, developing a biomimetic tri-layer tissue-engineered vascular graft is a major developmental direction of vascular tissue regeneration. Biodegradable polymers exhibit adequate mechanical characteristics and feasible operability, showing potential prospects in the construction of tissue engineering scaffold. Herein, we present a bio-inspired tri-layer tubular graft using biodegradable polymers to simulate natural vascular architecture. The inner layer made of polycaprolactone (PCL) nanofiber possesses high tensile strength and contributed to endothelial cell adhesion and proliferation. The middle layer consisted of poly(lactic-co-glycolide) (PLGA) with a three-dimensional porous structure is appropriate for vascular smooth muscle cells (SMCs) penetration. The polyurethane (PU) was selected to be the outer layer, aiming to hold the entire tubular structure, suggesting superior mechanical properties and ideal biocompatibility. Adhesion between independent layers is achieved by thermal crosslinking. The compliance, burst pressure and suture retention force of the tubular scaffold were 2.50 ± 1.60%, 2737.73 ± 583.41 mmHg and 13.06 ± 1.89 N, respectively. The in vivo study of subcutaneous implantation for 8 weeks demonstrated the biomimetic tri-layer vascular graft could maintain intimal integrity, cell infiltration, collagen deposition and scaffold biodegradation. Overall, the biomimetic tri-layer vascular graft promises to be a potential candidate for vascular replacement and regeneration.
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Affiliation(s)
- Weibin Jia
- National Glycoengineering Research Center and Shandong Provincial Key Laboratory of Carbohydrate Chemistry and Glycobiology, Shandong University, Qingdao 266200, PR China
| | - Min Li
- National Glycoengineering Research Center and Shandong Provincial Key Laboratory of Carbohydrate Chemistry and Glycobiology, Shandong University, Qingdao 266200, PR China
| | - Hongjuan Weng
- National Glycoengineering Research Center and Shandong Provincial Key Laboratory of Carbohydrate Chemistry and Glycobiology, Shandong University, Qingdao 266200, PR China
| | - Guofeng Gu
- National Glycoengineering Research Center and Shandong Provincial Key Laboratory of Carbohydrate Chemistry and Glycobiology, Shandong University, Qingdao 266200, PR China
| | - Zonggang Chen
- National Glycoengineering Research Center and Shandong Provincial Key Laboratory of Carbohydrate Chemistry and Glycobiology, Shandong University, Qingdao 266200, PR China.
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18
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Yan S, Napiwocki B, Xu Y, Zhang J, Zhang X, Wang X, Crone WC, Li Q, Turng LS. Wavy small-diameter vascular graft made of eggshell membrane and thermoplastic polyurethane. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2020; 107:110311. [PMID: 31761197 PMCID: PMC6905500 DOI: 10.1016/j.msec.2019.110311] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2019] [Revised: 09/17/2019] [Accepted: 10/12/2019] [Indexed: 12/17/2022]
Abstract
In this study, a small-diameter, double-layered eggshell membrane/thermoplastic polyurethane (ESM/TPU) vascular graft with a wavy structure was developed. The avian eggshell membrane, a fibrous structure similar to the extracellular matrix (ECM), has the potential to yield rapid endothelialization in vitro. The dopamine and heparin modification of the ESM surface not only promoted human umbilical vein endothelial cell (HUVEC) proliferation via cytocompatibility assessment, but also improved its anticoagulation properties as verified in platelet adhesion tests. The biomimetic mechanical properties of the vascular graft were provided by the elastic TPU fibers via electrospinning using a wavy cross-section rotating collector. The advantage of combining these two materials is to make use of the bioactivity of ESM as the internal membrane and the tunable mechanical properties of TPU as the external layer. The circumferentially wavy structure of the vascular graft produced a toe region in the non-linear section of the stress-strain curve similar to that of natural blood vessels. The ESM/TPU graft's circumferential ultimate strength was 2.57 MPa, its strain was 339% mm/mm, and its toe region was found to be around 20% mm/mm. Cyclical tension tests showed that the vascular graft could maintain good mechanical properties and showed no structural damage under repeated extension tests.
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Affiliation(s)
- Shujie Yan
- School of Mechanics and Engineering Science, Zhengzhou University, Zhengzhou, China; National Center for International Research of Micro-Nano Molding Technology Zhengzhou University, Zhengzhou, China; Polymer Engineering Center, Department of Mechanical Engineering, University of Wisconsin-Madison, Madison, WI, USA; Wisconsin Institute for Discovery University of Wisconsin-Madison, Madison, WI, USA
| | - Brett Napiwocki
- Wisconsin Institute for Discovery University of Wisconsin-Madison, Madison, WI, USA
| | - Yiyang Xu
- School of Mechanics and Engineering Science, Zhengzhou University, Zhengzhou, China; National Center for International Research of Micro-Nano Molding Technology Zhengzhou University, Zhengzhou, China; Polymer Engineering Center, Department of Mechanical Engineering, University of Wisconsin-Madison, Madison, WI, USA; Wisconsin Institute for Discovery University of Wisconsin-Madison, Madison, WI, USA
| | - Jue Zhang
- Morgridge Institute for Research, Madison, WI, USA
| | - Xiang Zhang
- School of Mechanics and Engineering Science, Zhengzhou University, Zhengzhou, China; National Center for International Research of Micro-Nano Molding Technology Zhengzhou University, Zhengzhou, China
| | - Xiaofeng Wang
- School of Mechanics and Engineering Science, Zhengzhou University, Zhengzhou, China; National Center for International Research of Micro-Nano Molding Technology Zhengzhou University, Zhengzhou, China
| | - Wendy C Crone
- Wisconsin Institute for Discovery University of Wisconsin-Madison, Madison, WI, USA
| | - Qian Li
- School of Mechanics and Engineering Science, Zhengzhou University, Zhengzhou, China; National Center for International Research of Micro-Nano Molding Technology Zhengzhou University, Zhengzhou, China.
| | - Lih-Sheng Turng
- Polymer Engineering Center, Department of Mechanical Engineering, University of Wisconsin-Madison, Madison, WI, USA; Wisconsin Institute for Discovery University of Wisconsin-Madison, Madison, WI, USA.
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19
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Tondnevis F, Keshvari H, Mohandesi JA. Fabrication, characterization, and in vitro evaluation of electrospun polyurethane‐gelatin‐carbon nanotube scaffolds for cardiovascular tissue engineering applications. J Biomed Mater Res B Appl Biomater 2020; 108:2276-2293. [DOI: 10.1002/jbm.b.34564] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Revised: 11/26/2019] [Accepted: 01/08/2020] [Indexed: 12/11/2022]
Affiliation(s)
- Farbod Tondnevis
- Biomaterials Group, Faculty of Biomedical EngineeringAmirkabir University of Technology P.O. Box 15875‐4413, Tehran Iran
| | - Hamid Keshvari
- Biomaterials Group, Faculty of Biomedical EngineeringAmirkabir University of Technology P.O. Box 15875‐4413, Tehran Iran
| | - Jamshid Aghazadeh Mohandesi
- Department of Mining and Metallurgical EngineeringAmirkabir University of Technology P.O. Box 15875‐4413, Tehran Iran
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20
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Wang Z, Mithieux SM, Weiss AS. Fabrication Techniques for Vascular and Vascularized Tissue Engineering. Adv Healthc Mater 2019; 8:e1900742. [PMID: 31402593 DOI: 10.1002/adhm.201900742] [Citation(s) in RCA: 55] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2019] [Revised: 07/12/2019] [Indexed: 12/19/2022]
Abstract
Impaired or damaged blood vessels can occur at all levels in the hierarchy of vascular systems from large vasculatures such as arteries and veins to meso- and microvasculatures such as arterioles, venules, and capillary networks. Vascular tissue engineering has become a promising approach for fabricating small-diameter vascular grafts for occlusive arteries. Vascularized tissue engineering aims to fabricate meso- and microvasculatures for the prevascularization of engineered tissues and organs. The ideal small-diameter vascular graft is biocompatible, bridgeable, and mechanically robust to maintain patency while promoting tissue remodeling. The desirable fabricated meso- and microvasculatures should rapidly integrate with the host blood vessels and allow nutrient and waste exchange throughout the construct after implantation. A number of techniques used, including engineering-based and cell-based approaches, to fabricate these synthetic vasculatures are herein explored, as well as the techniques developed to fabricate hierarchical structures that comprise multiple levels of vasculature.
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Affiliation(s)
- Ziyu Wang
- School of Life and Environmental Sciences University of Sydney NSW 2006 Australia
- Charles Perkins Centre University of Sydney NSW 2006 Australia
| | - Suzanne M. Mithieux
- School of Life and Environmental Sciences University of Sydney NSW 2006 Australia
- Charles Perkins Centre University of Sydney NSW 2006 Australia
| | - Anthony S. Weiss
- School of Life and Environmental Sciences University of Sydney NSW 2006 Australia
- Charles Perkins Centre University of Sydney NSW 2006 Australia
- Bosch Institute University of Sydney NSW 2006 Australia
- Sydney Nano Institute University of Sydney NSW 2006 Australia
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21
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Regenerative and durable small-diameter graft as an arterial conduit. Proc Natl Acad Sci U S A 2019; 116:12710-12719. [PMID: 31182572 DOI: 10.1073/pnas.1905966116] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Despite significant research efforts, clinical practice for arterial bypass surgery has been stagnant, and engineered grafts continue to face postimplantation challenges. Here, we describe the development and application of a durable small-diameter vascular graft with tailored regenerative capacity. We fabricated small-diameter vascular grafts by electrospinning fibrin tubes and poly(ε-caprolactone) fibrous sheaths, which improved suture retention strength and enabled long-term survival. Using surface topography in a hollow fibrin microfiber tube, we enable immediate, controlled perfusion and formation of a confluent endothelium within 3-4 days in vitro with human endothelial colony-forming cells, but a stable endothelium is noticeable at 4 weeks in vivo. Implantation of acellular or endothelialized fibrin grafts with an external ultrathin poly(ε-caprolactone) sheath as an interposition graft in the abdominal aorta of a severe combined immunodeficient Beige mouse model supports normal blood flow and vessel patency for 24 weeks. Mechanical properties of the implanted grafts closely approximate the native abdominal aorta properties after just 1 week in vivo. Fibrin mediated cellular remodeling, stable tunica intima and media formation, and abundant matrix deposition with organized collagen layers and wavy elastin lamellae. Endothelialized grafts evidenced controlled healthy remodeling with delayed and reduced macrophage infiltration alongside neo vasa vasorum-like structure formation, reduced calcification, and accelerated tunica media formation. Our studies establish a small-diameter graft that is fabricated in less than 1 week, mediates neotissue formation and incorporation into the native tissue, and matches the native vessel size and mechanical properties, overcoming main challenges in arterial bypass surgery.
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22
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Li J, Chen Z, Yang X. State of the Art of Small-Diameter Vessel-Polyurethane Substitutes. Macromol Biosci 2019; 19:e1800482. [PMID: 30840365 DOI: 10.1002/mabi.201800482] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2018] [Revised: 02/22/2019] [Indexed: 12/31/2022]
Abstract
Cardiovascular diseases are a severe threat to human health. Implantation of small-diameter vascular substitutes is a promising therapy in clinical operations. Polyurethane (PU) is considered one of the most suitable materials for this substitution due to its good mechanical properties, controlled biostability, and proper biocompatibility. According to biodegradability and biostability, in this review, PU small-diameter vascular substitutes are divided into two groups: biodegradable scaffolds and biostable prostheses, which are applied to the body for short- and long-term, respectively. Following this category, the degradation principles and mechanisms of different kinds of PUs are first discussed; then the chemical and physical methods for adjusting the properties and the research advances are summarized. On the basis of these discussions, the problems remaining at present are addressed, and the contour of future research and development of PU-based small-diameter vascular substitutes toward clinical applications is outlined.
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Affiliation(s)
- Jinge Li
- Polymer Composites Engineering Laboratory, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, No. 5625 Renmin Ave., Changchun, 130022, China
| | - Zhaobin Chen
- Polymer Composites Engineering Laboratory, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, No. 5625 Renmin Ave., Changchun, 130022, China
| | - Xiaoniu Yang
- State Key Laboratory of Polymer Physics and Chemistry, Polymer Composites Engineering Laboratory, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, No. 5625 Renmin Ave., Changchun, 130022, China
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23
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Ye H, Zhang K, Kai D, Li Z, Loh XJ. Polyester elastomers for soft tissue engineering. Chem Soc Rev 2018; 47:4545-4580. [PMID: 29722412 DOI: 10.1039/c8cs00161h] [Citation(s) in RCA: 116] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Polyester elastomers are soft, biodegradable and biocompatible and are commonly used in various biomedical applications, especially in tissue engineering. These synthetic polyesters can be easily fabricated using various techniques such as solvent casting, particle leaching, molding, electrospinning, 3-dimensional printing, photolithography, microablation etc. A large proportion of tissue engineering research efforts have focused on the use of allografts, decellularized animal scaffolds or other biological materials as scaffolds, but they face the major concern of triggering immunological responses from the host, on top of other issues. This review paper will introduce the recent developments in elastomeric polyesters, their synthesis and fabrication techniques, as well as their application in the biomedical field, focusing primarily on tissue engineering in ophthalmology, cardiac and vascular systems. Some of the commercial and near-commercial polyesters used in these tissue engineering fields will also be described.
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Affiliation(s)
- Hongye Ye
- Institute of Materials Research and Engineering (IMRE), 2 Fusionopolis Way, #08-03 Innovis, Singapore 138634, Singapore.
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24
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25
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Yu E, Mi HY, Zhang J, Thomson JA, Turng LS. Development of biomimetic thermoplastic polyurethane/fibroin small-diameter vascular grafts via a novel electrospinning approach. J Biomed Mater Res A 2018; 106:985-996. [PMID: 29143442 PMCID: PMC5826852 DOI: 10.1002/jbm.a.36297] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2017] [Revised: 10/28/2017] [Accepted: 11/10/2017] [Indexed: 12/18/2022]
Abstract
A new electrospinning approach for fabricating vascular grafts with a layered, circumferentially aligned, and micro-wavy fibrous structure similar to natural elastic tissues has been developed. The customized electrospinning collector was able to generate wavy fibers using the dynamic "jump rope" collecting process, which also solved the sample removal problem for mandrel-type collectors. In this study, natural silk fibroin and synthetic thermoplastic polyurethane (TPU) were combined at different weight ratios to produce hybrid small-diameter vascular grafts. The purpose of combining these two materials was to leverage the bioactivity and tunable mechanical properties of these natural and synthetic materials. Results showed that the electrospun fiber morphology was highly influenced by the material compositions and solvents employed. All of the TPU/fibroin hybrid grafts had mechanical properties comparable to natural blood vessels. The circumferentially aligned and wavy biomimetic configuration provided the grafts with a sufficient toe region and the capacity for long-term usage under repeated dilatation and contraction. Cell culture tests with human endothelial cells (EC) also revealed high cell viability and good biocompatibility for these grafts. © 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 106A: 985-996, 2018.
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Affiliation(s)
- Emily Yu
- Department of Mechanical Engineering, University of Wisconsin–Madison, WI, USA, 53706
- Wisconsin Institute for Discovery, University of Wisconsin–Madison, WI, USA, 53715
| | - Hao-Yang Mi
- Department of Mechanical Engineering, University of Wisconsin–Madison, WI, USA, 53706
- Wisconsin Institute for Discovery, University of Wisconsin–Madison, WI, USA, 53715
- Department of Industrial Equipment and Control Engineering, South China University of Technology, Guangzhou, China
| | - Jue Zhang
- Morgridge Institute for Research, WI, USA, 53715
| | | | - Lih-Sheng Turng
- Department of Mechanical Engineering, University of Wisconsin–Madison, WI, USA, 53706
- Wisconsin Institute for Discovery, University of Wisconsin–Madison, WI, USA, 53715
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Biomechanical property and modelling of venous wall. PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 2018; 133:56-75. [DOI: 10.1016/j.pbiomolbio.2017.11.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2017] [Revised: 11/13/2017] [Accepted: 11/15/2017] [Indexed: 11/18/2022]
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Aussel A, Montembault A, Malaise S, Foulc MP, Faure W, Cornet S, Aid R, Chaouat M, Delair T, Letourneur D, David L, Bordenave L. In Vitro Mechanical Property Evaluation of Chitosan-Based Hydrogels Intended for Vascular Graft Development. J Cardiovasc Transl Res 2017; 10:480-488. [PMID: 28762052 DOI: 10.1007/s12265-017-9763-z] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/22/2017] [Accepted: 07/20/2017] [Indexed: 11/24/2022]
Abstract
Vascular grafts made of synthetic polymers perform poorly in cardiac and peripheral bypass applications. In these applications, chitosan-based materials can be produced and shaped to provide a novel scaffold for vascular tissue engineering. The goal of this study was to evaluate in vitro the mechanical properties of a novel chitosan formulation to assess its potential for this scaffold. Two chitosan-based hydrogel tubes were produced by modulating chitosan concentration. Based on the standard ISO 7198:1998, the hydrogel tubes were characterized in vitro in terms of suture retention strength, tensile strength, compliance, and burst pressure. By increasing chitosan concentration, suture retention value increased to reach 1.1 N; average burst strength and elastic moduli also increased significantly. The compliance seemed to exhibit a low value for chitosan tubes of high concentration. By modulating chitosan concentration, we produced scaffolds with suitable mechanical properties to be implanted in vivo and withstand physiological blood pressures.
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Affiliation(s)
- Audrey Aussel
- University Bordeaux, 33000, Bordeaux, France
- INSERM, Bioingénierie tissulaire, U1026, 33000, Bordeaux, France
- CHU de Bordeaux, 33000, Bordeaux, France
| | - Alexandra Montembault
- University Lyon, Université Lyon 1, Ingénierie des Matériaux Polymères (IMP), CNRS UMR 5223, 69622, Villeurbanne Cedex, France
| | - Sébastien Malaise
- University Lyon, Université Lyon 1, Ingénierie des Matériaux Polymères (IMP), CNRS UMR 5223, 69622, Villeurbanne Cedex, France
| | | | - William Faure
- Rescoll, 8 Allée Geoffroy Saint-Hilaire, 33600, Pessac, France
| | | | - Rachida Aid
- INSERM, U1148, Laboratoire de recherche vasculaire translationnelle, 75000, Paris, France
- University Paris Diderot, Sorbonne Paris Cité, 75000, Paris, France
| | - Marc Chaouat
- INSERM, U1148, Laboratoire de recherche vasculaire translationnelle, 75000, Paris, France
| | - Thierry Delair
- University Lyon, Université Lyon 1, Ingénierie des Matériaux Polymères (IMP), CNRS UMR 5223, 69622, Villeurbanne Cedex, France
| | - Didier Letourneur
- INSERM, U1148, Laboratoire de recherche vasculaire translationnelle, 75000, Paris, France
- University Paris Diderot, Sorbonne Paris Cité, 75000, Paris, France
| | - Laurent David
- University Lyon, Université Lyon 1, Ingénierie des Matériaux Polymères (IMP), CNRS UMR 5223, 69622, Villeurbanne Cedex, France
| | - Laurence Bordenave
- University Bordeaux, 33000, Bordeaux, France.
- INSERM, Bioingénierie tissulaire, U1026, 33000, Bordeaux, France.
- CHU de Bordeaux, 33000, Bordeaux, France.
- CHU de Bordeaux, CIC 1401, 33000, Bordeaux, France.
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28
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Garcia JR, Sanyal A, Fatemifar F, Mottahedi M, Han HC. Twist buckling of veins under torsional loading. J Biomech 2017; 58:123-130. [PMID: 28526174 DOI: 10.1016/j.jbiomech.2017.04.018] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2016] [Revised: 03/31/2017] [Accepted: 04/24/2017] [Indexed: 10/19/2022]
Abstract
Veins are often subjected to torsion and twisted veins can hinder and disrupt normal blood flow but their mechanical behavior under torsion is poorly understood. The objective of this study was to investigate the twist deformation and buckling behavior of veins under torsion. Twist buckling tests were performed on porcine internal jugular veins (IJVs) and human great saphenous veins (GSVs) at various axial stretch ratio and lumen pressure conditions to determine their critical buckling torques and critical buckling twist angles. The mechanical behavior under torsion was characterized using a two-fiber strain energy density function and the buckling behavior was then simulated using finite element analysis. Our results demonstrated that twist buckling occurred in all veins under excessive torque characterized by a sudden kink formation. The critical buckling torque increased significantly with increasing lumen pressure for both porcine IJV and human GSV. But lumen pressure and axial stretch had little effect on the critical twist angle. The human GSVs are stiffer than the porcine IJVs. Finite element simulations captured the buckling behavior for individual veins under simultaneous extension, inflation, and torsion with strong correlation between predicted critical buckling torques and experimental data (R2=0.96). We conclude that veins can buckle under torsion loading and the lumen pressure significantly affects the critical buckling torque. These results improve our understanding of vein twist behavior and help identify key factors associated in the formation of twisted veins.
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Affiliation(s)
- Justin R Garcia
- Department of Mechanical Engineering, University of Texas at San Antonio, USA; Biomedical Engineering Program, UTSA-UTHSCSA, USA
| | - Arnav Sanyal
- Department of Mechanical Engineering, University of Texas at San Antonio, USA
| | - Fatemeh Fatemifar
- Department of Mechanical Engineering, University of Texas at San Antonio, USA
| | - Mohammad Mottahedi
- Department of Mechanical Engineering, University of Texas at San Antonio, USA
| | - Hai-Chao Han
- Department of Mechanical Engineering, University of Texas at San Antonio, USA; Biomedical Engineering Program, UTSA-UTHSCSA, USA; Institute of Mechanobiology & Medical Engineering, Shanghai Jiaotong University, China.
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29
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Dolan EB, Gunning GM, Davis TA, Cooney G, Eufrasio T, Murphy BP. The development and mechanical characterisation of a novel reinforced venous conduit that mimics the mechanical properties of an arterial wall. J Mech Behav Biomed Mater 2017; 71:23-31. [PMID: 28259025 DOI: 10.1016/j.jmbbm.2017.02.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2016] [Revised: 02/03/2017] [Accepted: 02/08/2017] [Indexed: 12/24/2022]
Abstract
Venous grafts have been used to bypass stenotic arteries for many decades. However, this "gold standard" treatment is far from optimal, with long-term vein graft patency rates reported to be as low as 50% at >15 years. These results could be a result of the structural and functional differences of veins compared to arteries. In this study we developed a new protocol for manufacturing reinforced fresh veins with a decellularized porcine arterial scaffold. This novel method was designed to be replicated easily in a surgical setting, and manufactured reinforced constructs were robust and easier to handle than the veins alone. Furthermore, we demonstrate that these Reinforced Venous-Arterial Conduits have comparable mechanical properties to native arteries, in terms of ultimate tensile strength (UTS) (2.36 vs. 2.24MPa) and collagen dominant phase (11.04 vs. 12.26MPa). Therefore, the Reinforced Venous-Arterial Conduit combines the benefits of using the current gold standard homogenous venous grafts composed of a confluent endothelial surface, with an "off-the-shelf" decellularized artery to improve the mechanical properties to closely mimic those of native arteries, while maintaining the self-repairing characteristics of native tissue. In conclusion in this study we have produced a construct and a new technique that combines the mechanical properties of both a natural vein and a decellularized artery to produce a reinforced venous graft that closely mimics the mechanical response of an arterial segment.
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Affiliation(s)
- Eimear B Dolan
- Trinity Centre for Bioengineering, Trinity Biomedical Sciences Institute, 152-160 Pearse Street, Trinity College Dublin, Dublin 2, Ireland; Department of Mechanical and Manufacturing Engineering, School of Engineering, Trinity College Dublin, Dublin 2, Ireland; Department of Anatomy, Royal College of Surgeons in Ireland, Dublin, Ireland
| | - Gillian M Gunning
- Trinity Centre for Bioengineering, Trinity Biomedical Sciences Institute, 152-160 Pearse Street, Trinity College Dublin, Dublin 2, Ireland; Department of Mechanical and Manufacturing Engineering, School of Engineering, Trinity College Dublin, Dublin 2, Ireland
| | - Travis A Davis
- Trinity Centre for Bioengineering, Trinity Biomedical Sciences Institute, 152-160 Pearse Street, Trinity College Dublin, Dublin 2, Ireland; Department of Mechanical and Manufacturing Engineering, School of Engineering, Trinity College Dublin, Dublin 2, Ireland
| | - Gerard Cooney
- Trinity Centre for Bioengineering, Trinity Biomedical Sciences Institute, 152-160 Pearse Street, Trinity College Dublin, Dublin 2, Ireland; Department of Mechanical and Manufacturing Engineering, School of Engineering, Trinity College Dublin, Dublin 2, Ireland
| | - Tatiane Eufrasio
- Trinity Centre for Bioengineering, Trinity Biomedical Sciences Institute, 152-160 Pearse Street, Trinity College Dublin, Dublin 2, Ireland; Advanced Materials and Bioengineering Research Centre (AMBER), Trinity College Dublin, Dublin 2, Ireland; Department of Anatomy, Royal College of Surgeons in Ireland, Dublin, Ireland
| | - Bruce P Murphy
- Trinity Centre for Bioengineering, Trinity Biomedical Sciences Institute, 152-160 Pearse Street, Trinity College Dublin, Dublin 2, Ireland; Department of Mechanical and Manufacturing Engineering, School of Engineering, Trinity College Dublin, Dublin 2, Ireland; Advanced Materials and Bioengineering Research Centre (AMBER), Trinity College Dublin, Dublin 2, Ireland.
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30
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Numerical investigation of the haemodynamics in the human fetal umbilical vein/ductus venosus based on the experimental data. Biosci Rep 2016; 36:BSR20160099. [PMID: 27512094 PMCID: PMC5041159 DOI: 10.1042/bsr20160099] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2016] [Accepted: 08/10/2016] [Indexed: 11/25/2022] Open
Abstract
Abortion of the fetus due to a disease, in an early stage of pregnancy, has been dramatically increased in the last decades. There is a still lack of knowledge on the various types of diseases which lead fetus to a vulnerable circumstance. The transport of oxygenated blood from the placenta to the human fetus has been an important clinical feature in Doppler velocimetry studies, especially the ductus venosus (DV). The DV connects intra-abdominal portion of the umbilical vein and the inferior vena cava (IVC) at the inlet of the right atrium and is, therefore, important when examining the fetus state of health. An abnormal flow in the DV can indicate a fetal disease such as, chromosomal abnormalities, cardiac defect, hypoxaemia and intrauterine growth restriction (IUGR). The blood flow in the fetal circulation has not been investigated much in detail. The blood flow in the fetal circulation provides necessary information for physician to make a suitable decision on abortion or alternative medical practice before or even after birth. The present study performed a comparative study to quantify the blood velocity in DV by a combination approach based on 3D computational simulation and Doppler measurement. The results showed that the velocity value in DV is significant and can be considered as an indicator of any kind of disease in fetal. The nodal displacement of the model was also analysed. It shows that DV tolerates a higher level of displacement compared with the other regions of the model, whereas the nodal pressure shows different results as the lowest values are located in DV.
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Abstract
Damage to soft tissues in the human body has been investigated for applications in healthcare, sports, and biomedical engineering. This paper reviews and classifies damage models for soft tissues to summarize achievements, identify new directions, and facilitate finite element analysis. The main ideas of damage modeling methods are illustrated and interpreted. A few key issues related to damage models, such as experimental data curve-fitting, computational effort, connection between damage and fractures/cracks, damage model applications, and fracture/crack extension simulation, are discussed. Several new challenges in the field are identified and outlined. This review can be useful for developing more advanced damage models and extending damage modeling methods to a variety of soft tissues.
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Affiliation(s)
- Wenguang Li
- School of Engineering, University of Glasgow, Glasgow, G12 8QQ UK
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Karimi A, Navidbakhsh M, Kudo S. A comparative study on the mechanical properties of the healthy and varicose human saphenous vein under uniaxial loading. J Med Eng Technol 2015; 39:490-7. [PMID: 26361230 DOI: 10.3109/03091902.2015.1086030] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Saphenous Vein (SV) due to fatness, age, inactiveness, etc. can be afflicted with varicose. The main reason of the varicose vein is believed to be related to the leg muscle pump which is unable to return the blood to the heart in contradiction of the effect of gravity. As a result of the varicose vein, both the structure and mechanical properties of the vein wall would alter. However, so far there is a lack of knowledge on the mechanical properties of the varicose vein. In this study, a comparative study was carried out to measure the elastic and hyperelastic mechanical properties of the healthy and varicose SVs. Healthy and varicose SVs were removed at autopsy and surgery from seven individuals and then axial tensile load was applied to them up to the failure point. In order to investigate the mechanical behaviour of the vein, this study was benefitted from three different stress definitions, such as 2nd Piola-Kichhoff, engineering and true stresses and four different strain definitions, i.e. Almansi-Hamel, Green-St. Venant, engineering and true strains, to determine the linear mechanical properties of the SVs. A Digital Image Correlation (DIC) technique was used to measure the true strain of the vein walls during load bearing. The non-linear mechanical behaviour of the SVs was also computationally evaluated via the Mooney-Rivlin material model. The true/Cauchy stress-strain diagram exhibited the elastic modulus of the varicose SVs as 45.11% lower than that of the healthy ones. Furthermore, by variation of the stress a significant alteration on the maximum stress of the healthy SVs was observed, but then not for the varicose veins. Additionally, the highest stresses of 4.99 and 0.65 MPa were observed for the healthy and varicose SVs, respectively. These results indicate a weakness in the mechanical strength of the SV when it becomes varicose, owing to the degradation of the elastin and collagen content of the SV. The Mooney-Rivlin hyperelastic and the Finite Element (FE) data were finally well compared to the experimental data.
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Affiliation(s)
- Alireza Karimi
- a Tissue Engineering and Biological Systems Research Laboratory, School of Mechanical Engineering, Iran University of Science and Technology , Tehran 16887 , Iran and.,b Department of Mechanical Engineering , Kyushu University , 744 Motooka, Nishi-ku , Fukuoka 819-0395 , Japan
| | - Mahdi Navidbakhsh
- a Tissue Engineering and Biological Systems Research Laboratory, School of Mechanical Engineering, Iran University of Science and Technology , Tehran 16887 , Iran and
| | - Susumu Kudo
- b Department of Mechanical Engineering , Kyushu University , 744 Motooka, Nishi-ku , Fukuoka 819-0395 , Japan
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A comparative study on the uniaxial mechanical properties of the umbilical vein and umbilical artery using different stress-strain definitions. AUSTRALASIAN PHYSICAL & ENGINEERING SCIENCES IN MEDICINE 2014; 37:645-54. [PMID: 25151140 DOI: 10.1007/s13246-014-0294-5] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2013] [Accepted: 08/19/2014] [Indexed: 10/24/2022]
Abstract
The umbilical cord is part of the fetus and generally includes one umbilical vein (UV) and two umbilical arteries (UAs). As the saphenous vein and UV are the most commonly used veins for the coronary artery disease treatment as a coronary artery bypass graft (CABG), understating the mechanical properties of UV has a key asset in its performance for CABG. However, there is not only a lack of knowledge on the mechanical properties of UV and UA but there is no agreement as to which stress-strain definition should be implemented to measure their mechanical properties. In this study, the UV and UA samples were removed after caesarean from eight individuals and subjected to a series of tensile testing. Three stress definitions (second Piola-Kichhoff stress, engineering stress, and true stress) and four strain definitions (Almansi-Hamel strain, Green-St. Venant strain, engineering strain, and true strain) were employed to determine the linear mechanical properties of UVs and UAs. The nonlinear mechanical behavior of UV/UA was computationally investigated using hyperelastic material models, such as Ogden and Mooney-Rivlin. The results showed that the effect of varying the stress definition on the maximum stress measurements of the UV/UA is significant but not when calculating the elastic modulus. In the true stress-strain diagram, the maximum strain of UV was 92 % higher, while the elastic modulus and maximum stress were 162 and 42 % lower than that of UA. The Mooney-Rivlin material model was designated to represent the nonlinear mechanical behavior of the UV and UA under uniaxial loading.
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Karimi A, Navidbakhsh M, Rezaee T, Hassani K. Measurement of the circumferential mechanical properties of the umbilical vein: experimental and numerical analyses. Comput Methods Biomech Biomed Engin 2014; 18:1418-26. [DOI: 10.1080/10255842.2014.910513] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Karimi A, Navidbakhsh M, Alizadeh M, Shojaei A. A comparative study on the mechanical properties of the umbilical vein and umbilical artery under uniaxial loading. Artery Res 2014. [DOI: 10.1016/j.artres.2014.02.001] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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