System and method for performing a single step cryoablation
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United States of America Patent
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May 17, 2005
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 a cryo-element mounted at the distal end of a cryo-catheter. A balloon catheter is provided having a U-shaped balloon attached thereon. The cryo-element is threaded onto a pre-positioned guidewire and advanced within the patient's vasculature until the cryo-element is positioned at the treatment site. Next, the balloon is threaded onto the guidewire and advanced within the patient's vasculature using the balloon catheter. At the treatment site, the U-shaped balloon is interposed between the cryo-element and the target tissue. Saline solution is pumped into the balloon causing the U-shaped balloon to expand and contact both 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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