| 摘要 |
<p>A system and method for cryoablating tissue at a target site in a patient includes a cryotip attached to the distal end of a catheter tube. The cryotip is made of a shape memory material that assumes a straight configuration at a first temperature and a coiled configuration at a second temperature. With the cryotip in the straight configuration, the cryotip is guided through the vasculature of a patient to the target site. A refrigerant fluid is introduced into the expansion chamber of the cryotip to cool the cryotip to the second temperature. At the second temperature, the cryotip transforms into the coiled configuration and is placed in contact with circumferential tissue around the target site. The circumferential tissue is then cryoablated in a single-step operation.</p> |
