Cryosurgical instrument with vent holes and method using same

Details Cryosurgical instrument with vent holes and method using same Cryosurgical instrument with vent holes and method using same

1991-09-06

1993-10-19

Pellegrino, Stephen C.

Surgery

Instruments

Cyrogenic application

606 21, 607105, A61B 1738

Patent

active

052541169

ABSTRACT:
A closed end surgical cryoprobe instrument with probe shaft diameter of 3 millimeters or less is made to achieve and maintain freezing zone temperatures close to that of the liquid cryogenic refrigerant. Using sub-cooled liquid nitrogen at approximately -208.degree. C. freezing zone temperatures as low as -206.degree. C. can be achieved in under 1 minute. The liquid nitrogen supply tube is provided with a plurality of small vent holes to vent gas formed or present in the refrigerant supply tube to the return refrigerant flow channel. The vent holes also allow small amount of liquid nitrogen to vent into the return flow channel to further reduce the temperature differential between the sub-cooled liquid nitrogen supply and the counter-current flowing return refrigerant.

REFERENCES:
patent: 3333587 (1967-08-01), Johnston
patent: 3369550 (1968-02-01), Armao
patent: 3662755 (1972-05-01), Rautenbach et al.
patent: 3907339 (1975-09-01), Stumpf et al.
patent: 4211086 (1980-07-01), Leonard et al.
patent: 5100425 (1992-03-01), Fischell et al.

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