An indwelling device for luminal organs with a bistable structure

摘要

The cylindrical indwelling device (1) is composed of a plurality of struts (3) which are circumferentially connected in such a manner as to share an axial rib (2) in an annular or spiral row. Are connected axially at key points by links (2a) to form a cylindrical shape having a mesh shape. Each strut (3) has at least one pair of strut sides forming a bistable structure that supports a load due to the action of the indwelling device in the radial direction, and a portion that induces a jumping buckling deformation, and compresses the indwelling device. The effect of attempting to radially impose a load on at least one pair of strut sides forming a bistable structure in a direction that prevents jumping and buckling deformation in the opposite direction. As a result, the indwelling device is introduced into the luminal organ, expanded in diameter, and after being placed there, the jumping in the opposite direction is prevented, so that the indwelling device is sufficiently resistant to the action of reducing the diameter of the indwelling device. It can be securely held.