Radially expandable axially non-contracting surgical stent

A - Human Necessities – 61 – F

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A61F 2/06 (2006.01) A61M 29/00 (2006.01) A61F 2/00 (2006.01)

Patent

CA 2270991

A surgical stent (10) is provided which can be radially expanded away from a central axis (2) within a body lumen, such as an artery. The stent (10) is formed from a series of struts (20) circumscribing a cylindrical contour of the stent (10). Each strut (20) has a series of bends (30) formed therein with each bend including at least one. trough (32) and at least one crest (36). Gaps (40) are provided between adjacent struts (20). Each gap (40) is spanned by an axial element such as a tie bar (50). Each tie bar (50) attaches to adjacent struts (20) through troughs (32) so that when the stent (10) is radially expanded, the struts (20) are not drawn together, but rather maintain their position and the stent (10) hence maintains its axial length without contracting. Other elements can alternatively be provided between adjacent circumferential elements to provide varying degrees of flexibility between adjacent struts (20).

Extenseur chirurgical (10) pouvant se dilater dans un sens radial en s'éloignant d'un axe central (2) à l'intérieur d'une lumière corporelle, telle qu'une artère. Cet extenseur (10) est constitué par une série d'éléments de compression (20) définissant le profil cylindrique de l'extenseur (10). Chaque élément de compression (20) présente une série d'incurvations (30) comprenant chacune au moins un creux (32) et au moins une crête (36). Des espaces (40) sont situés entre les éléments de compression contigus (20). Chaque espace (40) est mis en tension par un élément axial, tel qu'une barre de liaison (50). Chaque barre de liaison (50) est fixée aux éléments de compression contigus (20) par les creux (32), de sorte que, quand l'extenseur (10) est en état de dilatation radiale, les éléments de compression (20) ne sont pas rassemblés sous l'effet d'une traction, mais conservent plutôt leur position, ce qui permet à l'extenseur de conserver sa longueur axiale sans contraction. Dans un autre mode de réalisation, d'autres éléments peuvent être placés entre des éléments contigus de la circonférence, de manière à créer des degrés variables de souplesse entre les éléments de compression contigus (20).

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