Medical stents for body lumens exhibiting peristaltic motion
AssigneeSciMed Life Systems, Inc.
InventorsErik Andersen, Ernst Peter Strecker, Kathleen L. Hess, Susanne Urhoj
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Abstract
Methods for forming, shaping and heat treating stents for reinforcement of the lumen of peristaltic organs. The stent is formed by knitting preferably a nitinol wire into a pattern of overlapping loops selected such that from a relaxed state each row of loops may shift axially relative to and independently of the rows on either side. This local lengthening and shortening accommodates peristalsis of the organ without migrating within the organ.
Claims13
A method of manufacturing a wire medical device, the method comprising:
- providing an elastic metal wire;
- forming said wire so it defines, generally, a tube that has a first geometry,
- said tube being formed by bending said wire in a substantially regular pattern that forms the walls of said tube over its length, and thereafter
- shaping the tube to form a device having a second geometry, said second geometry differing from said first geometry and being effected by applying a mechanical deforming force to said tube in said first geometry so it conforms to said second geometry and, while maintaining said deforming force, heating and then cooling said tube such that said tube retains said second geometry when said mechanical deforming force is removed.
A method of manufacturing a wire medical device, the method comprising:
- providing an elastic metal wire;
- forming said wire so that it defines, generally, a self-expandable tube having a uniform diameter;
- said self-expandable tube being formed by bending said wire in a substantially regular pattern that forms the walls of said self-expandable tube over its length, and thereafter
- shaping the self-expandable tube to form a device having a non-uniform diameter by applying a first mechanical deforming force to only a portion of said self-expandable tube and, while maintaining said first mechanical deforming force, heating and then cooling said self-expandable tube such that said portion of said self-expandable tube retains its deformation when said first mechanical deforming force is removed.
Dependencies are inferred from the claim text.