Cryosurgical instrument

Details Cryosurgical instrument Cryosurgical instrument

1975-10-09

1977-04-19

Pace, Channing L.

Surgery

Truss

Pad

62293, A61B 1736

Patent

active

040182274

ABSTRACT:
A cryosurgical instrument having a purge cycle of indeterminate duration, separate and apart from its cooling and warming modes, which can be conducted with a refrigerant consisting of a low pressure unsaturated or saturated gas. During the purge cycle, the pressure of the refrigerant gas is regulated to a level below that which is required to effect a Joule-Thomson expansion of the gas upon its entrance into an expansion chamber adjacent the tip of the instrument while simultaneously exhausting the effluent to the atmosphere through an exhaust valve actuated by a footswitch.

REFERENCES:
patent: 3548829 (1970-12-01), Reynolds et al.
patent: 3613689 (1971-10-01), Crump et al.
patent: 3696813 (1972-10-01), Wallach
patent: 3913581 (1975-10-01), Ritson et al.

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