Steering mechanism for bi-directional catheter

A - Human Necessities – 61 – M

Patent

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Details

A61M 25/00 (2006.01) A61M 25/01 (2006.01) A61M 25/092 (2006.01)

Patent

CA 2508866

A bi-directional catheter with nearly double the throw in its catheter tip deflection defines a puller wire travel path having a U-turn a pulley which minimizes the offset angle between the puller wire and the longitudinal axis of the control handle while maximizing the travel distance of that puller wire for any given distance traveled by the pulley drawing the puller wire. In particular, the control handle of the catheter which includes a steering assembly having a lever arm carrying a pair of pulleys for drawing corresponding puller wires to deflect the tip section of the catheter. The pulleys are rotatably mounted eon opposing portions of the lever arm such that one pulley is moved distally as the other pulley is moved proximally when the lever arm is rotated. Because each puller wire is trained on a respective pulley, rotation of the lever arm causes the pulley that is moved proximally to draw its puller wire to deflect the tip section in the direction of the off-axis lumen in which that puller wire extends.

Il s'agit d'un cathéter bidirectionnel, avec presque le double de déviation de sa pointe, dont le câble de tirage décrit un trajet qui comporte une poulie demi-tour, ce qui minimise l'angle de décalage entre le câble de tirage et l'axe longitudinal de la poignée de commande. Ainsi, la distance du trajet de ce câble de tirage, est maximisée, pour toute distance parcourue par la poulie tirant sur le câble de tirage. En particulier, la poignée de commande du cathéter comprend un ensemble de direction pourvu d'un bras de levier portant un paire de poulies pour tirer sur les câbles de tirage correspondants, pour faire dévier la pointe du cathéter. Les poulies sont montées pour pouvoir tourner, sur les parties en opposition du bras de levier, de sorte qu'une poulie est déplacée en extrémité, à mesure que l'autre poulie est déplacée en amont, lorsque le bras de levier tourne. Du fait que chaque câble de tirage est entraîné sur sa poulie respective, la rotation du bras de levier cause le déplacement de la poulie en amont pour tirer sur son câble de tirage, afin de faire dévier la pointe dans le sens de la lumière excentrée dans laquelle ce câble de tirage s'étire.

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