Steerable catheter using flat pull wires and method of...

A - Human Necessities – 61 – M

Patent

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Details

A61M 25/00 (2006.01) A61M 25/09 (2006.01) B29C 63/24 (2006.01) B29C 63/42 (2006.01)

Patent

CA 2652550

A catheter assembly (100) includes an inner liner (10) made of flexible material and an outer layer (60) having a steering mechanism. The steering mechanism includes at least one flat wire and a corresponding lumen (42) through which the flat wire may travel. The steering mechanism may also include at least one pull ring to which the flat wires are attached. A layer of heat shrink (70) material may encompass the outer layer. A braided wire assembly (50), which may have a braid density that varies along the length of the catheter, may also be provided in the outer layer. The overall cross-section of the catheter assembly is preferably substantially circular. A catheter shaft (100) may include a plurality of segments (61, 62) of differing hardness characteristics. The outer layer typically comprises a melt processing polymer such that the catheter assembly may be laminated using heat.

L'invention concerne un ensemble cathéter (100) qui comprend une gaine intérieure (10) composée d'un matériau flexible et une couche extérieure (60) possédant un mécanisme d'orientation. Le mécanisme d'orientation comprend au moins un fil plat et une lumière correspondante (42) à travers laquelle le fil plat peut se déplacer. Le mécanisme d'orientation peut également comprendre au moins un anneau de traction auquel les fils plats sont attachés. Une couche d'un matériau thermorétractable (70) peut entourer la couche extérieure. Un ensemble fil tressé (50), dont la densité de tressage peut varier sur la longueur du cathéter, peut également être disposé dans la couche extérieure. La section transversale globale de l'ensemble cathéter est de préférence sensiblement circulaire. Une tige (100) de cathéter (100) peut comprendre une pluralité de segments (61, 62) présentant différentes caractéristiques de rigidité. La couche extérieure comprend généralement un polymère de traitement de matière en fusion de façon que l'ensemble cathéter puisse être stratifié par voie thermique.

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