Coaxial catheter system for performing a single step cryoablation
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United States of America Patent
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Sep 28, 2004
Grant Date -
Jun 17, 2004
app pub date -
Dec 11, 2002
filing date -
Dec 11, 2002
priority date (Note) -
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Abstract
A system for cryoablating target tissue at a treatment site includes an annular shaped balloon attached to the distal end of a first catheter. A cryo-element is attached to the distal end of a second catheter and the second catheter is disposed in the lumen of the first catheter. The cryo-element is positioned at the treatment site using the second catheter. Next, the first catheter is used to advance the balloon over the second catheter to the treatment site where the annular shaped balloon is Interposed between the cryo-element and the target tissue. Saline solution is pumped into the balloon to expand the balloon into contact with the cryo-element and the surrounding target tissue. Next, a refrigerant is expanded to cool the cryo-element, which in turn, freezes the saline solution. The resulting 'ice ball' extracts heat from surrounding tissue resulting in the cryoablation of a substantially circumferential portion of tissue.
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