Cryosurgical instrument
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United States of America Patent
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Jan 4, 1994
Grant Date -
N/A
app pub date -
Jul 6, 1992
filing date -
Jul 6, 1992
priority date (Note) -
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Abstract
A closed cycle cryosurgical instrument having a mixed gas assembly that is mounted in a housing and also having a cryosurgical probe unit. By using special (or certain) gas mixtures as opposed to pure gasses, pressure reductions to .perspectiveto. or 1/4 of that required by pure gasses can be obtained. The use of gas mixtures with their attendant lower pressures allows for a closed cycle system since expensive and complex multi-stage compressors are not required. With the gas mixtures it is possible to obtain temperatures in the range of liquid nitrogen using a Joule-Thomson based system.
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