Balloon catheter and method for manufacturing same

A - Human Necessities – 61 – M

Patent

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Details

A61M 25/10 (2006.01) A61M 25/00 (2006.01) A61M 29/04 (2006.01)

Patent

CA 2307021

A balloon catheter capable of improving re-wrapping property by preventing loosening of an inner tube after inflation of a balloon, preventing bending by easing discontinuity of rigidity at the bond portion between an outer tube and the balloon, improving advancing performance inside the blood vessel and passing performance of a constricted portion, and improving transmission property of push force by preventing a so-called "accordion phenomenon", comprising a catheter shaft (1) equipped with a double-tube structure comprising an inner tube (5) and an outer tube (4) at at least a position in the proximity of the distal end portion of the catheter and a balloon (3) disposed at the distal end portion of the catheter shaft (1), wherein a guide tube (11) having an outer diameter smaller than an inner diameter of the outer tube (4) and an inner diameter greater than an outer diameter of the inner tube (5) is disposed at at least the distal end portion of the outer tube (4) in such a manner as to constitute the double-tube with the outer tube (4), and the inner tube (5) is not fixed but is allowed to penetrate through inside of the guide tube (11) in the axial direction.

Ce cathéter à ballonnet est à même d'améliorer la capacité au ré-enveloppement en évitant le desserrement d'un tube interne après gonflage du ballonnet, d'éviter le cintrage en atténuant la discontinuité en matière de rigidité de la partie de liaison entre le tube externe et le ballonnet, d'améliorer la progression à l'intérieur du vaisseau sanguin ainsi que l'aptitude à franchir une partie étranglée ainsi que d'améliorer les qualités de transmission de la force de poussée en empêchant le phénomène dit "d'accordéon". Ce cathéter est constitué d'une tige (1) équipée d'une structure à double tube comprenant un tube interne (5) et un tube externe (4) positionnés au moins à proximité de l'extrémité distale du cathéter ainsi que d'un ballonnet (3) placé à l'extrémité distale de la tige (1). Un tube de guidage (11), dont le diamètre extérieur est inférieur au diamètre interne du tube externe (4) et dont le diamètre intérieur est supérieur au diamètre extérieur du tube interne (5), vient se positionner au moins à l'extrémité distale du tube externe (4) de manière à constituer avec le tube externe (4) le double tube. Le tube interne (5) n'est pas fixe mais peut pénétrer à l'intérieur de ce tube de guidage (11) dans le sens axial.

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