Cryosurgical system for destroying tumors by freezing
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United States of America Patent
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Aug 2, 1994
Issued Date -
N/A
app pub date -
Jan 31, 1992
filing date -
Sep 26, 1990
priority date (Note) -
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Abstract
An improved cryosurgical system includes means for cooling the cryoprobe instrument to temperatures below the normal boiling point of liquid nitrogen as well as means for recovering the sub-cooled liquid coolant. A unique cryoprobe instrument of simplified construction uses an active vacuum for thermal insulation. Means are provided for controllably adjusting the length of the freezing zone of the cryoprobe to allow the freezing zone to be adjusted for different sizes and shapes of tumors which may be 'observed' before surgery by ultrasound imaging. Multiple, disposable cryoprobe instruments can be individually controlled for both operating temperature and freeze zone length. A preferred refrigeration system for sub-cooling liquid nitrogen refrigerant or other cryogenic liquid refrigerant is based on the principles of evaporative cooling.
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