Cryosurgical instrument

Details Cryosurgical instrument Cryosurgical instrument

1992-07-06

1994-01-04

Aschenbrenner, Peter A.

Surgery

Instruments

Cyrogenic application

606 24, 606 20, A61B 1736

Patent

active

052755959

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.

REFERENCES:
patent: 3439680 (1969-04-01), Thomas, Jr.
patent: 3613689 (1971-10-01), Trumbell et al.
patent: 3630203 (1971-12-01), Sellinger et al.
patent: 3889680 (1975-06-01), Armao
patent: 3971383 (1976-07-01), van Gerven
patent: 4275734 (1981-06-01), Mitchiner
patent: 4377168 (1983-03-01), Rzasa et al.
patent: 5078713 (1992-01-01), Varney

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