Apparatus for a stent or other medical device having a...

Details Apparatus for a stent or other medical device having a... Apparatus for a stent or other medical device having a...

A - Human Necessities

61

F

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

Patent

CA 2497519

A stent is described comprising a unit cell having a negative spring rate and a bistable function. The unit cell comprises first and second segments, the first segment being more rigid than the second segment. The second segment is coupled to the first segment, and the first segment comprises a substantially fixed sinusoidal shape. In the contracted state, the second segment is held stable in a sinusoidal shape, but when a force is applied the second segment bends out to a stable, convex-shaped deployed state. The second segments withstand the application of radial forces in the convex-shaped deployed state, and diametral recoil of the stent is minimized.

L'invention concerne un stent comprenant une cellule unitaire présentant une raideur du ressort négative et une fonction bistable. La cellule unitaire comprend un premier et un second segment; le premier segment étant plus rigide que le second segment. Le second segment est couplé au premier segment. Le premier segment comprend une forme sinusoïdale essentiellement fixe. A l'état contracté, le second segment est stabilisé dans une forme sinusoïdale, mais lorsqu'une force est appliquée, ledit second segment fléchit pour adopter un état déployé convexe stable. Les seconds segments résistent à l'application de forces radiales à l'état déployé convexe, et le recul diamétral du stent est réduit.

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