Cryosurgical instrument

Details Cryosurgical instrument Cryosurgical instrument

1978-05-15

1980-07-08

Michell, Robert W.

Surgery

Truss

Pad

62293, A61B 1736, A61F 712

Patent

active

042112311

ABSTRACT:
A cryosurgical instrument which may be used with interchangeable spray and closed end cryotips includes a body member with a central bore extending partially therethrough. Refrigerant is supplied to a first point in the bore through a valved refrigerant supply line while an effluent opening connects an effluent line to a second point in the bore. The bore receives the inner ends of cryotips. All cryotips used with the instrument include refrigerant delivery tubes having inner ends which are positioned adjacent the first point in the bore and O-rings which are seated between the first point and the second point in the bore to prevent escape of refrigerant. Closed end cryotips to be used with the instrument further include an effluent channel extending from an expansion chamber to the second point in the bore. A second O-ring is provided with closed end cryotips. The second O-ring is seated between the second point in the bore and its open end to prevent escape of effluent refrigerant flowing through the effluent channel.

REFERENCES:
patent: 3439680 (1969-04-01), Thomas, Jr.
patent: 3651813 (1972-03-01), Bryne
patent: 3664344 (1972-05-01), Bryne
patent: 3696813 (1972-10-01), Wallach
patent: 3712306 (1973-01-01), Bryne
patent: 3807403 (1974-04-01), Stumpf et al.
patent: 3933156 (1976-01-01), Riggi
patent: 3934589 (1976-01-01), Zimmer

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