| US RE40,815 E1 | ||
| Control system for cryosurgery | ||
| Ravikumar V. Kudaravalli, Pleasanton, Calif. (US); and Hong Li, Jilin (China) | ||
| Assigned to AMS Research Corporation, Minnetonka, Minn. (US) | ||
| Filed on Oct. 01, 2007, as Appl. No. 11/865,640. | ||
| Application 09/635108 is a continuation in part of application No. 09/344423, filed on Jun. 25, 1999, granted, now 6,237,355. | ||
| Application 11/865640 is a reissue of application No. 09/635108, filed on Aug. 09, 2000, now 6,471,694, filed on Oct. 29, 2002. | ||
| Int. Cl. A61B 18/18 (2006.01) | ||
| U.S. Cl. 606—21 [62/293; 606/22] | 19 Claims |
| 1. Apparatus for performing cryosurgery, comprising:
a refrigerant supply source connectable to a high pressure duct;
a cryosurgery catheter having an inlet connectable to said high pressure duct, said catheter having a tip;
a refrigerant expansion element in said catheter;
a temperature sensor on said catheter;
a pressure sensor adapted to sense pressure inside said catheter tip;
a low pressure duct connectable to an outlet of said catheter;
a flow sensor in said low pressure duct downstream of said catheter; and
a control system connected and programmed to maintain a selected catheter temperature, in response to signals from said temperature
sensor, said pressure sensor, and said flow sensor.
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