Convertible catheter incorporating distal force transfer...

A - Human Necessities – 61 – M

Patent

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Details

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

Patent

CA 2322817

A method and apparatus for increasing the force transmission from a core wire to a more proximal portion of the catheter, and for directly providing column support at or near the side port of a convertible or rapid-exchange type of catheter. A core wire is typically attached to a proximal portion of a catheter, and extends distally therefrom through a lumen in the catheter. In accordance with the present invention, the core wire has a size and shape relative the lumen of the catheter such that the lateral movement of the core wire is restricted in a restriction region. By restricting the core wire at a distal location relative to the proximal catheter portion, the force transmission from the core wire to the proximal catheter portion can be increased. Further, in a rapid exchange or convertible type configuration, the restriction region may be placed proximate the side hole. By restricting the movement of the core wire adjacent to the side hole, the core wire can provide direct column support thereto reducing the likelihood of kinging or the like at that location.

L'invention concerne un procédé et un appareil pour augmenter la transmission de force d'un fil central à une partie plus proximale d'un cathéter et pour soutenir directement la colonne au niveau ou près de l'orifice latéral d'un cathéter convertible ou du type à remplacement rapide. Un fil central est généralement fixé sur une partie proximale d'un cathéter et s'en éloigne dans le sens distal à travers une lumière du cathéter. Selon l'invention, la taille et la forme du fil central par rapport à la lumière du cathéter sont telles que le mouvement latéral du fil central est restreint dans une région de restriction. La restriction du mouvement latéral du fil central en un endroit distal par rapport à la partie proximale du cathéter permet d'augmenter la transmission de force du fil central à la partie proximale. En outre, dans une configuration du type à remplacement rapide ou convertible, la région de restriction peut être placée à proximité immédiate de l'orifice latéral. La restriction du mouvement latéral du fil central adjacent à l'orifice latéral apporte au fil central un soutien de colonne direct au niveau ou près de l'orifice latéral, réduisant ainsi les risques de vrillage ou d'autres déformations à cet endroit.

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