Embolic protection devices

A - Human Necessities – 61 – F

Patent

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Details

A61F 2/01 (2006.01)

Patent

CA 2397116

An embolic protection device for use in a blood vessel when an interventional procedure is being performed in a stenosed or occluded region to capture any embolic material which may be created and released into the bloodstream during the procedure. The device includes a filtering assembly having a self- expanding strut assembly and a filter element attached thereto. In one embodiment, the filtering assembly is attached to the distal end of a guide wire and is deployed within the patient's vasculature as the guide wire is manipulated into the area of treatment. A restraining sheath placed over the filtering assembly in a coaxial arrangement maintains the filtering assembly in its collapsed position until it is ready to be deployed by the physician. Thereafter, the sheath can be retracted to expose the filtering assembly which will then self-expand within the patient's vasculature. Interventional devices can be delivered over the guide wire and any embolic debris created during the interventional procedure and released into the blood stream will enter the filtering assembly and be captured therein. Other embodiments include filtering assemblies attached to an outer tubular member and inner shaft member which apply axial force to the distal ends of the assembly to either expand or contract the struts as needed.

L'invention porte sur un dispositif de protection contre les emboles se plaçant dans un vaisseau sanguin lors d'une intervention dans une zone sténosée ou occluse permettant de capturer tout embole créé ou libéré dans le flux sanguin pendant l'intervention. Le dispositif comporte un dispositif de filtrage comprenant un écarteur auto-extensible et un filtre lui étant fixé. Dans une exécution, le dispositif de filtrage, monté à l'extrémité distale d'un fil guide, se déploie dans le vaiseau du patient lors de la manipulation du fil guide dans la zone à traiter. Une gaine de contention placée coaxialement sur le dispositif de filtrage le maintient en position repliée jusqu'à ce que le praticien décide de le déployer. Puis on retire la gaine pour exposer le dispositif de filtrage qui se déploie de lui même dans le vaisseau du patient. On peut alors faire transiter sur le fil guide les instruments nécessaires à l'intervention et capturer dans le filtre tout embole créé dans le flux sanguin y entrant pendant l'intervention. D'autres exécutions comportent un dispositif de filtrage fixé à un élément tubulaire extérieur et une tige intérieure qui applique une force axiale à l'extrémité distale du dispositif, soit pour dilater, soit pour contracter l'écarteur selon les besoins.

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