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1. (WO2018164205) INDWELLING INSTRUMENT HAVING BISTABLE STRUCTURE FOR USE IN LUMINAL ORGAN

Pub. No.:    WO/2018/164205    International Application No.:    PCT/JP2018/008867
Publication Date: Fri Sep 14 01:59:59 CEST 2018 International Filing Date: Thu Mar 08 00:59:59 CET 2018
IPC: A61F 2/90
Applicants: YAMAGUCHI UNIVERSITY
国立大学法人山口大学
INSTITUTE OF BIO-MEDICAL AND WELFARE ENGINEERING
株式会社医療福祉工学研究所
Inventors: MINAMI Kazuyuki
南 和幸
Title: INDWELLING INSTRUMENT HAVING BISTABLE STRUCTURE FOR USE IN LUMINAL ORGAN
Abstract:
A cylindrically shaped indwelling instrument (1) is formed into said cylindrical shape in the form of a mesh by linking a plurality of struts (3) in a circumferential direction in such a way as to share an axial direction rib (2), to form annular or helical rows, and linking the rows of the plurality of struts (3) at required locations in the axial direction by means of links (2a). Each strut (3) has at least one group of strut edges forming a bistable structure supporting a load resulting from an action of the indwelling instrument acting in a diametrically contracting direction, and a part which induces snap buckling deformation thereof. An action which acts in such a way as to diametrically contract the indwelling instrument imparts to the at least one group of strut edges forming the bistable structure a load in a direction impeding reverse snap buckling deformation. As a result, after the indwelling instrument has been introduced into the luminal organ, has been expanded diametrically and has been left in place, reverse snap buckling deformation is prevented and actions causing the indwelling instrument to contract diametrically are adequately resisted, making it possible for the diametrically expanded state to be reliably maintained.