CRYOPROBE THERMAL CONTROL FOR A CLOSED-LOOP CRYOSURGICAL SYSTEM
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United States of America Patent
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Issued Date -
May 29, 2008
app pub date -
Nov 19, 2007
filing date -
Nov 17, 2006
priority date (Note) -
Abandoned
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Abstract
A cryosurgical system providing for temperature control of individual cryoprobes so as to simplify and increase treatment flexibility in cryoablation procedures. The cryosurgical system provides individual control of multiple cryoprobes in a closed-loop refrigeration circuit. The individual control allows the simultaneous use of multiple cryoprobes in a procedure. Typically six to eight probes are used but additional probes and control thereof is contemplated by this invention. The primary refrigeration circuit's compressor can also be utilized to generate pressurized hot vapor for heating the probe ends. In order to direct the pressurized hot vapor to the probe ends, an internal valving and control system reverses the direction of pressurized gas flow through the cryoprobes, delivering the hot gas immediately to the ends by bypassing the heat exchangers. Thus each cryoprobe can be independently controllable to provide full, partial or no freezing or heating at any time.
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