Catheter tube and method of manufacturing the tube

A - Human Necessities – 61 – M

Patent

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Details

A61M 25/01 (2006.01) A61L 29/00 (2006.01) A61M 25/00 (2006.01)

Patent

CA 2109030

A catheter tube is composed of a main portion 22 and a tip portion 23. The main portion 22 of the catheter tube is of such a structure that an inner tube 4 and an outer tube 6 are joined via a reinforcing material layer 5, but the tip portion 23 is of such a structure that only the inner tube 4 and the outer tube 6 are joined without intervening the reinforcing material layer 5 between the two tubes. The reinforcing material layer 5 is formed by arranging a filamentous element (e.g., stainless steel wire) 51 around the inner tube in a lattice manner. The inclination angles .theta.1, .theta.2 and .theta.3 of the filamentous element 51 with respect to the axis of the catheter tube at the first, second and third regions 221, 222 and 223, respectively are determined so as to establish the relationship as .theta.1 > .theta.2 > .theta.3. Therefore, the rigidity of the catheter 2 can be increased in accordance with the decrease of the inclination angle of the filamentous element 51. According to the catheter tube, excellent pushing, torque transmission, follow-up to a guide wire, and kink-resistant characteristics can be attained, simultaneously and respectively.

a présente invention vise un tube de cathéter composé d'une partie principale 22 et d'une partie d'extrémité 23. La partie principale 22 est constituée de telle façon qu'un tube intérieur 4 et un tube extérieur 6 sont joints par une couche de matériau de renfort 5, alors que dans la partie d'extrémité 23 le tube intérieur 4 et le tube extérieur 6 sont joints sans couche de renfort 5 entre les deux. La couche de renfort 5 est formée d'un élément filamenteux (p. ex. un fil d'acier inoxydable) 51 disposé en treillis autour du tube intérieur. Les angles d'inclinaison .theta.1, .theta.2 et .theta.3 de l'élément filamenteux 51 par rapport à l'axe du cathéter dans les première, deuxième et troisième régions 221, 222 et 223 sont déterminés respectivement de manière à établir la relation .theta.1>.theta.2>.theta.3. Il est donc possible d'augmenter la rigidité du cathéter 2 en réduisant l'angle d'inclinaison de l'élément filamenteux 51. Selon le tube de cathéter, il est possible d'obtenir d'excellentes caractéristiques de poussée, de transmission de couple, de suivi d'un fil guide et de résistance à la déformation, simultanément et individuellement.

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