Patent ID: 7731711
Filing Date: 2010-06-08
Classification: A61B

Abstract:
1. A method for cryogenic treatment of a patient, comprising: contacting a portion of the patient with a cryosurgical instrument, said instrument having a tip; delivering a cryogen to said tip; and repeating said delivering said cryogen to said tip at least once while said tip is in contact with at least a portion of the patient, wherein controlling said delivering of said cryogen to said tip also controls temperature at said tip, such that the delivering and the repeating said delivering produce at least one freezing stage and at least one higher temperature freezing stage, and wherein said instrument comprises a plurality of valves for controlling said delivering said cryogen and wherein said repeating said delivering said cryogen to said tip at least once comprises: closing a valve to stop delivering said cryogen, and opening a valve to again deliver said cryogen, by opening a first valve of said plurality of valves to expel said cryogen to the atmosphere, closing said first valve, and opening a second valve of said plurality of valves to deliver said cryogen.