Cryosurgical system and method
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United States of America Patent
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Oct 23, 2001
Issued Date -
N/A
app pub date -
Aug 19, 1999
filing date -
Sep 22, 1997
priority date (Note) -
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status (Latency Note)
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Abstract
A cryosurgical system comprises a compressor unit and a probe assembly. A secondary refrigerant stream from the compressor unit pre-cools a heat exchanger within the probe assembly in a standby mode of operation. After the heat exchange is pre-cooled, a primary refrigerant stream can be passed through the cooled heat exchanger and thereafter expanded within a tissue-contacting portion of the probe assembly to achieve very low temperatures, typically minus 100.degree. C. or lower. After cooling, the refrigerant stream may be passed through the probe assembly with no or partial expansion to warm the tissue-contacting surface of the probe. A probe sheath can be used to provide sterility.
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