Cryosurgical instrument with vent means and method using same

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

1995-03-06

1996-05-28

Pellegrino, Stephen C.

Surgery

Instruments

Cyrogenic application

606 20, 606 26, 607 96, 607105, 62293, A61B 1738

Patent

active

055206824

ABSTRACT:
A closed end surgical cryoprobe instrument may have a probe shaft diameter of 3 millimeters or less and can 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. Heat transfer is maintained through nucleate boiling. In place of vent holes, narrow slits may be provided in the supply tube. Alternatively, a sintered porous metal supply tube can be used as the vent means.

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.
patent: 5334181 (1994-08-01), Rubinsky et al.
Cryostatic Congelation: A System for Producing a Limited, Controlled Region of Cooling or Freezing of Biologic Tissues, Irving S. Cooper and Arnold J. Lee, pp. 259-263.
Cryogenic Surgery of the Basal Ganglia, Irving S. Cooper, Aug. 18, 1962, pp. 600-604.

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