CPC A61B 18/02 (2013.01) [A61B 18/0218 (2013.01); F04B 15/08 (2013.01); A61B 2018/00333 (2013.01); A61B 2018/00815 (2013.01); A61B 2018/00821 (2013.01); A61B 2018/00863 (2013.01); A61B 2018/0293 (2013.01)] | 20 Claims |
1. A cryogenic apparatus for cryogenic treatment of a tissue of a living subject, the cryogenic apparatus comprising:
a probe having a distal end and a return lumen;
a temperature sensor located at the distal end of the probe;
a pump configured to deliver a cryogenic fluid to the distal end of the probe and to receive the cryogenic fluid returning via the return lumen from the distal end of the probe, the pump comprising a pump motor configured to activate the pump;
a separator, coupled to the return lumen and configured to separate the returning cryogenic fluid into a returning cryogenic liquid and a returning cryogenic gas;
a flow meter, configured to measure a rate of flow of the returning cryogenic gas; and
a processor configured to activate the pump motor and on activation thereof to control a rate of pumping of the pump motor in response to a temperature measured by the temperature sensor and the rate of flow of the returning cryogenic gas.
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