Catheter equipped with expansible member and method of...

A - Human Necessities – 61 – M

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128/127.1

A61M 25/10 (2006.01) A61M 25/00 (2006.01) A61M 29/02 (2006.01) B29C 57/00 (2006.01) B29C 65/18 (2006.01) B29C 65/26 (2006.01)

Patent

CA 2001057

A catheter equipped with an expansible member according to the present invention comprises a first lumen whose tip is open, a second lumen whose tip is closed, a foldable expansible member communicating with the second lumen, and a rigidity imparting member consisting of a linear member extending in the axial direction disposed in the second lumen. Therefore, an extreme flection or bend of the catheter is prevented without decrease of the flexibility of the catheter, especially the elastic deformability in the lateral direction with respect to the axial direction of the catheter. Thus, the force applied to the base end portion of the catheter for advancing the tip end portion thereof is surely transmitted to the tip end portion. Further, a catheter equipped with an expansible member according to the present invention comprises a first lumen whose tip is open, a second lumen whose tip is closed, and a foldable expansible member communicating with the second lumen, the outer diameter of the tip end portion of the catheter including a portion to which the expansible member is attached is smaller than that of the base end portion of the catheter. Therefore, the tip end portion of the catheter can be inserted into a severer stricture portion or in a more peripheral blood vessel. Further, a catheter equipped with an expansible member according to the present invention comprises a first lumen whose tip is open, a second lumen whose tip is closed, and a foldable expansible member communicating with the second lumen, the tip of the expansible member forming the tip of the catheter. Therefore, the expansible member is prevented from peeling off and the tip end of the catheter is prevented from being an injury to the inner wall of a blood vessel when the catheter advances in the blood vessel.

L'invention porte sur un cathéter muni d'un élément extensible et comportant une première lumière dont la pointe est ouverte, une deuxième lumière dont la pointe est fermée, un élément extensible pliable qui communique avec la deuxième lumière et un élément donnant de la rigidité, constitué d'un élément linéaire se prolongeant dans le sens axial, placé à l'intérieur de la deuxième lumière. Une extrême flexion ou courbure du cathéter est ainsi prévenue sans diminuer la souplesse de ce dernier, et surtout sans diminuer la capacité de déformation élastique dans le sens latéral en ce qui a trait au sens axial du cathéter. Donc, la force appliquée sur la base du cathéter afin de faire avancer la pointe de ce dernier est certainement transmise à la pointe. En outre, selon l'invention, un cathéter muni d'un élément extensible comporte une première lumière dont la pointe est ouverte, une deuxième lumière dont la pointe est fermée et un élément extensible pliable qui communique avec la deuxième lumière. Le diamètre externe de la pointe du cathéter, y compris une partie à laquelle l'élément extensible est fixé, est plus petit que celui de la base du cathéter. La pointe peut donc être insérée dans une partie dont le rétrécissement est important ou dans un vaisseau sanguin plus périphérique. De plus, selon l'invention, un cathéter muni d'un élément extensible comporte une première lumière dont la pointe est ouverte, une deuxième lumière dont la pointe est fermée et un élément extensible pliable qui communique avec la deuxième lumière, la pointe de l'élément extensible formant la pointe du cathéter. Il est donc impossible à l'élément extensible de se détacher et à la pointe du cathéter de blesser la paroi interne d'un vaisseau sanguin quand le cathéter avance dans le vaisseau.

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