CRYOGENIC BALLOON ABLATION SYSTEM

摘要

A cryogenic ablation catheter includes a catheter shaft, a balloon and a connector respectively at the catheter shaft proximal and distal ends, a refrigerant delivery tube assembly including a refrigerant delivery tube rotatable within the catheter shaft lumen, and a refrigerant delivery element with an outlet located inside the balloon which directs refrigerant outwardly against the balloon at different rotary positions as it rotates. A cryogenic balloon ablation system includes the cryogenic ablation catheter, a catheter coupler mating with the connector, a motor including a rotatable hollow motor shaft, and a delivery line fluidly coupled to a cryogenic gas source for supplying cryogenic gas to the refrigerant delivery tube. At least one of the refrigerant delivery tube and the delivery line passes at least partway through the hollow motor shaft. The coupling tip of the connector and the refrigerant delivery tube rotate with the motor shaft.

主权项

1. A cryogenic ablation catheter comprising:
a catheter shaft having proximal and distal ends and a catheter shaft lumen extending between the proximal and distal ends; an expandable and collapsible balloon mounted to the distal end of the catheter shaft, the balloon having an inner surface defining a balloon interior; a connector at the proximal end of the catheter shaft; and a refrigerant delivery tube assembly comprising:
a refrigerant delivery tube housed within the catheter shaft for rotary movement relative to the catheter shaft, the refrigerant delivery tube having an open proximal end towards the connector, an open distal end at the balloon and a refrigerant delivery lumen extending therebetween; anda refrigerant delivery element at the distal end of the refrigerant delivery tube, the refrigerant delivery element having an outlet located within the balloon interior, the outlet fluidly coupled to the open distal end of the refrigerant delivery tube, the outlet configured to direct refrigerant outwardly towards the inner surface of the balloon at different rotary positions according to the rotary orientation of the refrigerant delivery tube.