Surgery – Instruments – Cyrogenic application
Patent
1992-01-31
1994-08-02
Shay, David M.
Surgery
Instruments
Cyrogenic application
606 20, 606 23, 606 26, A61B 1736
Patent
active
053341813
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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Finkelstein J. J.
Jones Steve
Neu Dan
Onik Gary
Rubinsky Boris
Cryomedical Sciences Inc.
Shay David M.
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