Abstract: A cutaneous clamp 8 has angled, hollow tubes 23, 24 leading to hollow jaws 27, 28 having vents 30, 31, with a spacer 40 which can force the tubes together so that the jaws close upon tissue when the spacer is moved along the tubes by operator controlled means 41, 42. The clamp is removably fastened to a source 7 of cryogenic fluid which flows through the tubes and jaws and out the vents 30, 31 and related tubing 33-38.

Abstract: A liquid cryogen withdrawal device includes a plug (14) for insertion into the neck of a cryogen-containing dewar (10) in gas-tight relationship. A withdrawal tube (17) passes through the plug to conduct liquid from the bottom of the dewar through a sintered bronze filter to a container to be filled with cryogen, and a pressure tube (19) fitted with a pump (20). Cryogen is stored in the dewar with a loose fitting cap thereon, with no withdrawal device in the dewar. When liquid is desired to be retrieved from the dewar, the withdrawal device is inserted into the dewar; and the pump is operated to create enough pressure to force a suitable amount of liquid from the dewar. The plug may have a gas pressure relief valve disposed thereon.

Abstract: A hand-held cryosurgical instrument is provided with an insulating, cold-resistive, non-slip grip, which fits onto the neck of a cryosurgical instrument by means of machined threads. The grip has a lip for the users hand to rest against to protect it from the cold metal of the instrument.

Abstract: In a cryosurgical instrument having a dewar and a cap which is threaded onto the dewar when in use, with a main valve portion secured to the cap by threads, the handedness of the threads on the main valve portion are opposite to the handedness of the cap threads, whereby applying thrust through the main valve portion to remove the cap from the dewar will tend to tighten, rather than loosen the main valve portion in the cap.

Abstract: The cap which is threaded onto the dewar of a cryosurgical instrument has a vent hole therethrough which is normally closed off by a gasket when the cap is secured to the dewar, but which can allow the venting of gaseous cryogen therethrough when the cap is loosened. The threads of the cap have a scalloped region in which the threads have been machined away so as to provide a passage for gaseous cryogen, whereby, when the cap is loosened on the dewar, pressure therein is released by gas escaping either through the hole or through the scalloped region of the threads.

Abstract: Cryosurgical probe tips (20,66) are in metallurgical contact with coils of insulated resistor wire (27, 27a) with one end connected through copper wire (75) to a pin (32) insertable into a switch (33, 34, 51-61) of a battery pack (35-50) which may be clipped (64) to cryosurgical apparatus (9-14), and the other end connected through cryogen liquid feed tube structure (19, 19a) and the cryosurgical apparatus to the other end of the battery pack.

Abstract: Liquified cryogen, such as nitrogen, from a source (43) is applied to a fiber mat (16, 18) adjacent to surfaces (10, 12) of an article (14) to be cooled. The cryogen may be delivered by a tube (40) which is disposed between the mat and a structure (20) to which the mat is fastened by press fit barbed fasteners (22).

Abstract: Electronic circuitry 22, 24, 26 is thermally checked by cooling with liquified nitrogen from a cryogenic delivery unit 19, directly by means of a stream 10 or a spray 28 delivered through an aperture 11, 30 of the delivery unit 19 spaced from the surface of the circuitry.

Abstract: A cryosurgical instrument employing a standard, double-walled, 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; 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.

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.