Endovascular prosthesis

Abstract

Said endovascular prosthesis (1) is made up of a tubular knitted textile structure having, within the meshes of said knitted textile structure, at least one helical continuous weft thread (3) extending along the entire main dimension of the endovascular prosthesis. Said at least one thread (3) is formed of a shape memory alloy having previously undergone such a treatment, and in particular a thermomechanical treatment such that, at the temperature of the human body, the thread provides the structure with the tubular shape thereof by super-elastic or shape-memory effect.

Description

technical field [0001] The present invention relates to the field of endovascular prostheses or stent-grafts and is more particularly intended to be implemented in the case of aortic aneurysms. [0002] The invention is more particularly directed to such a vascular stent-graft integrating together a tubular fabric structure and at least one filamentary element of the shape memory alloy type. Background technique [0003] An aneurysm is a dilation of a segment of an artery. Ruptures in this diseased area are likely to result in bleeding, sometimes fatal. When such an aneurysm is detected, the medical profession may implement two solutions: the first consists in resorbing the aneurysm by open surgery, ie by a particularly severe and invasive technique. The second solution consists in shunting the aneurysm by inserting a stent-graft at the level of the aneurysm, which is implanted upstream and downstream of the aneurysm in the relevant artery; then comes endovascular surgery ...

AI Technical Summary

Problems solved by technology

[0009] Another inherent difficulty with prior art stent-grafts is mispositioning and unsatisfactory performance at the level of the folds that the stent-graft is intended to implant in order to fit the artery. bends that may be taken with specific twists and turns at the level of

This folding of the stent graft is likely to cause it to at least partially occlude, leading to serious complications requiring new surgical procedures

[0010] Another difficulty posed by prior art stent grafts is their heterogeneity

Indeed, due to sutures or loop fastening patterns or similar systems, and often due to the exoskeleton on the fabric structure, the stent-graft has mechanical properties that deviate from the native tissue, which more or less leads to a rapid rejection of the stent-graft, Periodic replacement is required due to possible risk of new blockages and may not produce the desired effect in the right case of resorbing aneurysms

Furthermore, the structural heterogeneity of the prior art stent-grafts may lead to possible sliding (migration) of said structures within the artery, which inevitably leads to the need for a second highly invasive procedure

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