Portable cryosurgical instrument

Claim 1

A portable cryosurgical instrument suitable for one handed operation comprising: an insulated container for holding a liquefied gas coolant; closure means for said insulated container; a pressure line communicating with the inside of said insulated container; tubing means extending from near the bottom of said insulated container to the outside thereof; heat exchange means attached to said tubing means outside said container for vaporizing said liquefied gas coolant passing therethrough; application means attached to said heat exchange means for applying the vaporized gas coolant; handle means on said insulated container; a manual squeeze bulb connected to said pressure line and positioned adjacent said handle means in such position that when the fingers of a human hand grasp the handle, the thumb of the same hand is in a position to compress the bulb against the handle; said squeeze bulb being connected to atmosphere through an opening in an intermediate portion of the bulb such that said opening must be covered before pressurization, wherein when said handle is gripped by the fingers of one hand of the operator, the bulb opening can be covered by the thumb of the same hand of the operator to stop venting before pressurization whereby the thumb compresses said bulb against said handle to cause pressurization.