An embolization device for positioning in a blood vessel

A - Human Necessities – 61 – B

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A61B 17/00 (2006.01) A61B 17/12 (2006.01)

Patent

CA 2263575

An embolization device for positioning in a blood vessel comprises an elongated wire body (1) which in its unloaded condition has a predetermined shape and has an elongated shape with a substantially straight centre line during its insertion through a catheter (18) to a placement site in the blood vessel and after its release from the catheter assumes a complexly curved shape which depends on the predetermined shape and on the blood vessel impact on the wire body. In its predetermined shape the wire body has at least one section (4) located between its front and back ends in which the centre line has substantially no curvature or such a small curvature that along a length of at least 20 mm it follows a helix-free path. The front end section (2, 2', 2") of the wire body is adapted to be frictionally locked to the vessel wall when discharged from the catheter, before said helix-free section (4) has been discharged from the catheter. When the helix-free section (4) is discharged it will bend sideways and seek towards the middle of the vessel lumen and continue towards the opposite vessel wall where it is frictionally locked. At continued pushing out many such vessel-crossing wire portions (20) occur, which provides efficient occlusion of the vessel.

La présente invention concerne un dispositif intravasculaire d'embolisation qui se compose d'un corps filaire (1) de forme allongée. Lorsqu'il n'est pas en place, le corps filaire présente une forme initiale allongée caractérisée par un segment central sensiblement rectiligne permettant l'introduction vers le site d'implantation en passant par un cathéter (18). Une fois qu'il est libéré du cathéter, le corps filaire épouse une forme de courbe complexe qui est définie par la forme initiale et la réaction du vaisseau sanguin sur le corps filaire. Sous sa forme initiale, le corps filaire comporte au moins, entre l'extrémité antérieure et l'extrémité postérieure, un segment (4) dont l'axe central n'est pratiquement pas incurvé, ou si faiblement incurvé que, sur une longueur d'au moins 20 mm, il suit un tracé non spiralé. Le segment d'extrémité antérieure (2, 2', 2'') du corps filaire est conçu pour se bloquer par friction contre la paroi vasculaire lors de la libération du cathéter, et ce, avant que le segment non spiralé (4) ne soit libéré du cathéter. A sa libération du cathéter, le segment non spiralé (4) s'infléchit sur le côté et cherche sa voie vers le centre de la lumière vasculaire, puis continue sa progression vers la paroi vasculaire opposée contre laquelle il se bloque par friction. Si on prolonge la poussée pour libérer le dispositif, de nombreuses parties filaires (20) viennent se placer en travers du vaisseau sanguin, réalisant ainsi une occlusion efficace du vaisseau sanguin.

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