Catheter centering device

Details Catheter centering device Catheter centering device

A - Human Necessities

61

M

A61M 36/00 (2006.01) A61M 25/01 (2006.01) A61N 5/00 (2006.01) A61N 5/10 (2006.01)

Patent

CA 2232918

A medical device (10) for treating a body vessel (42) with a radioactive source (16) includes an elongated tubular catheter (14) and an axially flexible support structure (12) on a distal end of the catheter (14). The catheter (14) has proximal and distal ends, and a lumen (18) for receiving a radioactive source (16). The support structure (12) is formed from a plurality of filaments (22) which are helically wound and interwoven in a braided configuration and has a plurality of alternately spaced unconstricted (32) and constricted (30) regions. The unconstricted regions (32) are radially compressible and self-expandable from a positioning diameter when the device (10) is in a positioning state to a vessel-engaging, treatment diameter which is greater than the positioning diameter when the device(10) is in the treatment state. The constricted regions (30) are engaged with the catheter (14) and concentric with the unconstricted regions (32). When in the treatment state the support structure (12) causes the catheter (14) to be substantially radially centered within a vessel (42) so radiation is uniformly applied to the vessel (42) during treatment.

Un instrument médical (10) destiné à traiter un vaisseau de l'organisme (42) au moyen d'une source radioactive (16) comprend un cathéter tubulaire allongé (14) et une structure support souple dans la direction axiale (12) sur l'extrémité distale du cathéter (14). Le cathéter (14) comporte des extrémités proximale et distale, et une lumière (18) destinée à recevoir la source radioactive (16). La structure support (12) est formée d'un grand nombre de filaments (22) enroulés et entrelacés en hélice pour former une tresse et de nombreuses régions non rétrécies (32) et rétrécies (30) alternativement espacées. Les régions non rétrécies (32) sont compressibles dans la direction radiale et auto-extensibles, d'un diamètre de positionnement, lorsque l'instrument (10) est en mode de positionnement, à un diamètre de fixation au vaisseau et de traitement, qui est supérieur au diamètre de positionnement, lorsque l'instrument (10) est en mode de traitement. Les régions rétrécies (30) sont fixées au cathéter (14) et concentriques par rapport aux régions non rétrécies (32). En cours de traitement, la structure support (12) fait en sorte que le cathéter (14) soit nettement centré radialement à l'intérieur d'un vaisseau (42), de façon que les rayonnements soient appliqués uniformément au vaisseau (42) pendant le traitement.

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