Method of catheter balloon manufacture and use

A - Human Necessities – 61 – M

Patent

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Details

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

Patent

CA 2199549

A catheter balloon is prepared for inflation, and the balloon is inflated by the following process. At least a portion of an elastic, thermoplastic tube is radially stretched until the radially stretched tube portion exhibits a desired increase in molecular orientation. The stretching conditions, such as selective heating, preferably cause a central section of the stretched tube portion to have less wall thickness than end sections of the tube portion. At least part of the tube portion may be longitudinally stretched relative to the tube, to create a desired biaxial molecular orientation. Thereafter, the tube portion is optionally placed into a stent, the tube portion being part of a catheter. The tube portion is inserted into a patient to position the stent and tube portion at a desired position, such as a location in the coronary artery. After positioning of the tube portion and stent, the lumen of the tube portion is pressurized to cause radial expansion of the tube portion within the patient, with a central section of the tube portion expanding first.

Un cathéter à ballonnet est préparé pour gonflage et est gonflé de la façon suivante. Au moins une portion d'un tube thermoplastique élastique est étirée radialement jusqu'à ce que l'orientation moléculaire de cette portion présente l'augmentation désirée. Les conditions d'étirement, comme le chauffage sélectif, font en sorte que la partie centrale de la portion de tube étirée présente une paroi moins épaisse que les extrémités de cette portion. Au moins une partie de la portion de tube peut être étirée longitudinalement par rapport au tube pour créer l'orientation moléculaire biaxiale désirée. Ensuite, la portion de tube peut être placée sur un tuteur, la portion de tube faisant partie d'un cathéter. La portion de tube est insérée dans un patient de manière que le tuteur et la portion de tube se trouvent dans une position désirée, comme dans l'artère coronaire. Après positionnement de la portion de tube et du tuteur, la lumière de la portion de tube est mise sous pression pour dilater radialement la portion de tube à l'intérieur du patient, la partie centrale de la portion de tube se dilatant en premier.

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