CRYOGENIC-RADIOFREQUENCY ABLATION SYSTEM

摘要

A medical treatment system, including a catheter body defining a fluid flow path therethrough; an expandable element disposed on the catheter body, the expandable element defining a cooling chamber therein in fluid communication with the fluid flow path; a plurality of electrodes disposed on the expandable element; a cryogenic fluid source in fluid communication with the fluid flow path; and a radiofrequency energy source in electrical communication with the plurality of electrodes. A method of treating a cardiac tissue site proximate an orifice, including substantially occluding the orifice with an expandable element; powering a plurality of electrodes coupled to the expandable element to reach a predetermined target temperature; circulating a coolant through the expandable element to freeze portions of the cardiac tissue site located between the plurality of electrodes; and ablating the non-frozen portions of the tissue site with the plurality of electrodes.