Cryogenic surgical instrument

Details Cryogenic surgical instrument Cryogenic surgical instrument

1975-04-29

1976-07-27

Yasko, John D.

Surgery

Truss

Pad

62293, A61B 1736

Patent

active

039713830

ABSTRACT:
To insulate the supply lines to an operating tip of a cryogenic surgical instrument, a coaxial assembly of tubes is provided, the inner one being connected to a supply of cryogenic liquid, such as liquid nitrogen; the space between the outer wall of the inner tube and the next tube forming a return line for evaporated cryogenic liquid which is vented to the atmosphere; and the space between the outermost one of the coaxial tubes and the intermediate tube containing a gas such as normal butane, introduced at atmospheric pressure and which has high heat-insulating properties, and which solidifies, or sublimates, to avoid a vacuum and make possible construction of the supply lines as plastic, preferably polyamide tubes, retaining flexibility in use.

REFERENCES:
patent: 3266492 (1966-08-01), Steinberg
patent: 3298371 (1967-01-01), Lee
patent: 3333587 (1967-08-01), Johnston
patent: 3398738 (1968-08-01), Lamb et al.
patent: 3507283 (1970-04-01), Thomas, Jr.
patent: 3823718 (1974-07-01), Tromovitch
patent: 3907339 (1975-09-01), Stumpf et al.

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