Self-expanding prosthesis having stable axial length

Details Self-expanding prosthesis having stable axial length Self-expanding prosthesis having stable axial length

A - Human Necessities

61

F

A61F 2/06 (2006.01)

Patent

CA 2086333

2086333 9200043 PCTABS00010 A body implantable stent (16) consists of two or more generally tubular, coaxial and slidably connected stent segments (20, 22). Each segment (20, 22) is of open weave construction, formed of multiple braided, helically wound strands of resilient material. The stent is elastically deformed to a reduced radius when deployed. When released after positioning, the stent (16) self-expands radially and each segment (20, 22) contracts in the axial direction. To preserve a consistent length of the stent (16) the axially outward and non-overlapping portions (30, 32) of the stent (16) can be designed for secure fixation to the tissue, for example as radially outward flares (34, 36). Alternative approaches to maintain axial length include the addition of reinforcing filaments (62) near the stent opposite ends to increase the restoring force, the provision of fixation hooks (70) at opposite ends of the stent, and securing an elongate, axially directed, flexible and inextensible wire (104) to the opposite ends of the stent.

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