Cryoablation systems and methods

Details Cryoablation systems and methods Cryoablation systems and methods

A - Human Necessities

61

B

A61B 18/02 (2006.01) A61F 7/12 (2006.01) A61M 25/01 (2006.01) A61B 17/00 (2006.01)

Patent

CA 2471788

Systems and methods for treating an arrhythmia originating in a pulmonary vein of a patient are described. The system includes a rigid sheath and an elongated catheter that defines an axis and has an ablating distal section. The distal section includes a plurality of conductive bands, with each band establishing an enclosed chamber. The ablating distal section is reconfigurable between a first compact configuration in which each band is positioned relatively near the axis for transit through the sheath and second expanded configuration in which each band is positioned relatively far from the axis. Once in the second configuration, a fluid refrigerant is expanded into each enclosed chamber to cool the bands and cryoablate tissue. The second configuration is particularly useful for ablating a circumferential band of tissue, for example, a band of tissue surrounding the opening (i.e. ostium) where a pulmonary vein connects with the left atrium.

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