Cryosurgical instrument reservoir

Details Cryosurgical instrument reservoir Cryosurgical instrument reservoir

1976-12-06

1978-09-26

Michell, Robert W.

Surgery

Truss

Pad

215 13R, 220901, A61B 1736

Patent

active

041161998

ABSTRACT:
A cryosurgical instrument employing a standard, doublewalled, metal vacuum bottle or dewer has a collar metallurgically bonded to the top of the dewer near the mouth thereof to provide machined threads for releasably engaging the delivery and control portion of the instrument to the reservoir portion of the instrument. The collar provides additional strength and support to the portion where the two walls of the dewer are joined to each other. A vent is provided in a bottom cap of the vacuum dewer. A valve directly in the cryogen delivery line is connected by a stem to a fulcrumed operating handle (the subject of a division thereof); a 360.degree. fulcrum is used, to permit rotating the handle for thumb or finger operation with either the right or the left hand, as desired; rotation of the handle also rotates the valve stem so as to assist in freeing it from crystalline adhesion which may result from moisture in the cryogen or in the ambient air. In one embodiment, the 360.degree. fulcrum has a cam surface which can be positioned wherever it is desired to cause the operating handle to be locked into the on position, regardless of its position of rotation. The fulcrum is adjustable for the relationship between the motion of the handle and the operation of the valve.

REFERENCES:
patent: 1511852 (1924-10-01), Wagner
patent: 2645097 (1950-11-01), Posch
patent: 3739956 (1973-06-01), Reynolds
patent: 3823718 (1974-07-01), Tromovitch
patent: 3863794 (1975-02-01), Hata
patent: 3889681 (1975-06-01), Waller et al.

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