Distal protection filter with improved wall apposition

摘要

In accordance with the present invention, a distal protection and embolic material retrieval device with improved apposition to both large and small vessel walls of varying geometries for enhancing the filtering of embolic material during intravascular procedures while allowing for the passage of blood is provided. The device includes a filter basket (10) designed to maximize apposition of the filtering portion to that of the vessel wall and may include struts (20) which provide circumferential support to the filtering membrane (50) and thereby minimizing or eliminating in-folding of the filter basket. Thin film materials may also be utilized for the filtering membrane of the filter basket. In addition one can incorporate biological and/or pharmaceutical agents in combination with the present invention.

<Paragraphs id="pa02" num="0002" xmlns:base="http://www.sipo.gov.cn/XMLSchema/base">In one embodiment a vascular filtering device comprises: a supporting collar (30) having a concentric though hole adapted to slidably engage with a guide wire; a primary supporting strut having a proximal end and a distal end; and a compliant substantially conical membrane. The distal end of said supporting strut is operatively attached to the supporting collar and the proximal end of the supporting strut is free to expand away from a guide wire. The membrane is operatively attached to both said supporting strut and to said supporting collar.