Cold tip rf/ultrasonic ablation catheter

Details Cold tip rf/ultrasonic ablation catheter Cold tip rf/ultrasonic ablation catheter

A - Human Necessities

61

B

A61B 18/00 (2006.01) A61B 17/22 (2006.01) A61B 18/02 (2006.01) A61B 18/14 (2006.01) A61B 18/18 (2006.01)

Patent

CA 2437140

A catheter for ablating internal tissue using radiofrequency (rf) or ultrasonic energy includes a mechanism to cool the catheter's distal tip. The catheter also includes either an rf electrode or an ultrasonic transducer positioned at the tip to direct energy into the internal tissue for tissue ablation. With the distal tip of the catheter positioned adjacent the target tissue, a refrigerant is introduced into the catheter and allowed to expand near the catheter's distal tip. During expansion, the fluid refrigerant transitions from a liquid state to a gaseous state. Latent heat absorbed during the phase transition cools the tip of the catheter to a temperature sufficient to prevent tissue charring and coagulum formation during ablation. In another implementation, the catheter tip is cooled to a temperature sufficient to freeze tissue and create an ice-bail at the catheter tip that stabilizes the tip relative to the target tissue.

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