Length Redundancy and Twist Improve the Biomechanical Properties of Polytetrafluoroethylene Bypass Grafts.
Biomechanical Phenomena
Blood Vessel Prosthesis
Blood Vessel Prosthesis Implantation
/ instrumentation
Compressive Strength
Elasticity
Hemodynamics
Lower Extremity
/ blood supply
Materials Testing
Polytetrafluoroethylene
/ chemistry
Prosthesis Design
Prosthesis Failure
Stress, Mechanical
Tensile Strength
Journal
Annals of vascular surgery
ISSN: 1615-5947
Titre abrégé: Ann Vasc Surg
Pays: Netherlands
ID NLM: 8703941
Informations de publication
Date de publication:
Nov 2019
Nov 2019
Historique:
received:
22
12
2018
revised:
23
02
2019
accepted:
18
04
2019
pubmed:
19
7
2019
medline:
10
3
2020
entrez:
19
7
2019
Statut:
ppublish
Résumé
The iliofemoropopliteal artery significantly changes path length during normal hip and knee flexion. Prosthetic bypass grafts, such as polytetrafluoroethylene (PTFE) grafts, are relatively stiff and thus can subject graft anastomoses to high tension when the path length increases. The aim of this study was to examine the influence of length redundancy and twist on the biomechanical properties of PTFE bypass grafts. Unreinforced and ring-reinforced PTFE grafts were loaded in an axial mechanical testing machine to measure the tensile and compressive axial forces with varying levels of length redundancy and axial twist. Adding 5-15% length redundancy to a graft decreases the force to cause 5% extension by > 90% without substantially increasing shortening forces. Adding 4.5°/cm of axial twist imparts a corkscrew shape to the graft without increasing extension or shortening forces in the presence of length redundancy. Ring-reinforced PTFE grafts require more length redundancy to experience these reductions in forces especially in the presence of axial twist. A modest amount of length redundancy and twist (i.e., a cork-screw condition) confers improved biomechanical properties in a PTFE graft, especially in ring-reinforced grafts. This should be taken into consideration when fashioning an arterial bypass graft in the iliofemoropopliteal segment.
Sections du résumé
BACKGROUND
BACKGROUND
The iliofemoropopliteal artery significantly changes path length during normal hip and knee flexion. Prosthetic bypass grafts, such as polytetrafluoroethylene (PTFE) grafts, are relatively stiff and thus can subject graft anastomoses to high tension when the path length increases. The aim of this study was to examine the influence of length redundancy and twist on the biomechanical properties of PTFE bypass grafts.
METHODS
METHODS
Unreinforced and ring-reinforced PTFE grafts were loaded in an axial mechanical testing machine to measure the tensile and compressive axial forces with varying levels of length redundancy and axial twist.
RESULTS
RESULTS
Adding 5-15% length redundancy to a graft decreases the force to cause 5% extension by > 90% without substantially increasing shortening forces. Adding 4.5°/cm of axial twist imparts a corkscrew shape to the graft without increasing extension or shortening forces in the presence of length redundancy. Ring-reinforced PTFE grafts require more length redundancy to experience these reductions in forces especially in the presence of axial twist.
CONCLUSIONS
CONCLUSIONS
A modest amount of length redundancy and twist (i.e., a cork-screw condition) confers improved biomechanical properties in a PTFE graft, especially in ring-reinforced grafts. This should be taken into consideration when fashioning an arterial bypass graft in the iliofemoropopliteal segment.
Identifiants
pubmed: 31319171
pii: S0890-5096(19)30395-4
doi: 10.1016/j.avsg.2019.04.007
pmc: PMC6900574
pii:
doi:
Substances chimiques
Polytetrafluoroethylene
9002-84-0
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
410-415Subventions
Organisme : Medical Research Council
ID : MC_PC_16082
Pays : United Kingdom
Informations de copyright
Copyright © 2019 The Author(s). Published by Elsevier Inc. All rights reserved.
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