System for bi-directionally controlling the cryo-tip of a cryoablation catheter
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United States of America Patent
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May 20, 2008
Grant Date -
Dec 29, 2005
app pub date -
Jun 24, 2004
filing date -
Jun 24, 2004
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A bi-directional system for actively deflecting the distal tip of a catheter includes a reconfigurable tube that is positioned proximal to the catheter's distal tip. The tube is formed with slits that are arranged to allow the tube to be transformed from a relaxed, cylindrical configuration to a plurality of deflected configurations. First and second pull wires are provided, with each wire having a respective distal end that is attached to the distal end of the tube. Each wire extends to a catheter handle where it is attached to a respective reel. The reels can be rotated, back and forth, to selectively deflect or relax the tube. To ensure a smooth recovery after a relatively large deflection, a mechanism is disclosed for delaying an application of tension on one of the pull wires until at least a portion of any tension on the other pull wire is released.
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