Key result
Long-term vascular graft failures underscore the need for standards characterizing time-dependent arterial and textile elasticity.
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Statistical investigation reveals primary mechanisms of vascular graft failure over 30 years, highlighting the need for standardizing mechanical and structural material evaluation.
A statistical investigation of reported vascular graft failures over a period of 30 years is undertaken. The most important causes of graft failure are underlined, as well as the time to failure and relative frequency of each failure mechanism. This brings out the need for a critical review of the properties of basic textile structures used in today's vascular prosthetic grafts. The physiologic and structural factors which contribute to mechanical failure of arteries and artery/implant composite systems are analyzed. The importance of obtaining the complete set of time-dependent elastic constants of the artery--which is viewed as an anisotropic material--is pointed out. Future research areas important for characterizing the mechanical behavior of artery/implant systems are suggested, with the aim of establishing rational standards for prosthesis evaluation.
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Pourdeyhimi et al. (1986) conducted a review in Vascular graft failure. Vascular prosthetic grafts (textile structures) was evaluated on Causes of graft failure, time to failure, and relative frequency of each failure mechanism. Vascular prosthetic graft failures investigated over 30 years highlight the need to characterize time-dependent elastic constants of arteries and textile structures to establish evaluation standards.
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