CS215780B1 - Interchangeable working liquid nitrogen container for cryosurgical instruments - Google Patents

Abstract

Replaceable working container for liquid nitrogen for cryosurgical instruments with exhaust and safety valve. The container is intended for autonomous cryosurgical instruments for direct connection to the cryosurgical instrument. The essence of the t- design is that the inner tube of the container neck, adapted for inserting the input branch of the cryosurgical instrument and sealed to the instrument in a way that allows rotation of the container around the axis, is extended by bending into the corner between the bottom and the cylindrical wall of the inner container, while the outlet tubes of the exhaust and safety valve open into the opposite corner between the wall and the lid of the container. The container is intended primarily for outpatient cryosurgical instruments and is illustrated in more detail in the drawing.

Description

BACKGROUND OF THE INVENTION The present invention relates to the construction of a replaceable liquid nitrogen working vessel for cryosurgical instruments, provided with an exhaust and relief valve, in particular for working with the instrument even in a vertical position.

Cryosurgical devices using liquid nitrogen to obtain very low temperatures are of two types. In one of these, liquid nitrogen from a large reservoir is fed to a cryosurgical instrument through a flexible hose, while in a second type device a small liquid nitrogen reservoir is attached directly to the instrument. '

Instruments with a large reservoir and flexible liquid nitrogen supply allow working with the tool in any position, but they are very expensive and the possibility of manufacturing them in CSSR is dependent on the import of components.

The hitherto known designs of cryosurgical devices with a small liquid nitrogen working vessel attached directly to the instrument do not allow the instrument to be operated in all necessary postures.

These disadvantages of the prior art devices are overcome by the design of the replaceable liquid nitrogen working vessel for cryosurgical instruments provided with an exhaust and relief valve according to the invention, which is characterized in that the inner tube of the double walled vessel neck is sized to receive the cryosurgical instrument inlet into the corner between the bottom and the cylindrical wall of the inner receptacle, while the exhaust and relief valve outlet tubes open into the opposite corner between the cylindrical wall and the lid of the inner receptacle,

BRIEF DESCRIPTION OF THE DRAWINGS The drawing illustrates a double wall container with two pressure relief valves and a throat adapted to be rotatably sealed to an inlet branch of a cryosurgical instrument.

Liquid nitrogen 10 is stored in an inner container formed by a bottom 2 with a cylindrical wall J and a lid 6 which are separated from the outer shell 11 by an evacuated space 12. The inner tube of the throat 1 is straightly sunk into the inner container in a length necessary to insert the inlet branch 20 of the cryosurgical instrument, and by bending it further extended into a corner between the cylindrical wall J and the bottom 2 of the inner container. The connection of the inlet branch 16 to the neck 1 of the container is sealed by a rubber ring 8 in such a way that the container can be rotated at least 180 ° about its axis. In the lid 6 / container are located two double-tap branches. Inner tubes J, resp. The taps 8 are extended into the inner receptacle and are provided with tubing 8 and tubing 8, respectively. 2, which opens into the upper corner between the cylindrical wall J and the lid 6 of the inner receptacle at a diagonally opposite location where the bent end of the extension of the tube 1 opens.

The inner tubes 2, pWp · are separated from the outer tubes by a common evacuated space 12 and are adapted to receive the sealing ring 13a at the point of the vacuum-tight connection. event. to which it is a spring 15a. event. 15b, the plate 14a is pressed. event. 14b. The spring pressure 15 can be adjusted by sliding the cover 16a. event. 16b. whose position is determined eg? screw 17a. event. 17b.

The vacuum in the evacuated space 12 is maintained by the sorbent 18.

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The vial is filled with liquid nitrogen by pouring or injecting any of the branches 16 in the upper lid 6 of the vial to loosen the screw 17a. event. 17b and removing the cover 16a. event. 16b with fan. It is preferable to fill the container with a branch b with an inner tube 19 extended to the bottom of the inner container. Plates 14a. 14b with springs 15a. 15b acts as pressure relief valves that automatically discharge excess nitrogen gas from the container at a certain pressure given by the surface of the plate 14a, 14b by the pressure of the spring 15a. B. It is advantageous to set the pressure at which the valves are opened to be different. Then the lower pressure valve serves to maintain the necessary working overpressure in the container, and the second valve, set to a pressure of a small safety value higher than the first valve, is used as a safety pressure relief.

Claims (1)

SUBJECT OF THE INVENTION Replaceable liquid nitrogen working vessel for cryosurgical instruments with exhaust and relief valve, characterized in that the inner tube (1) of the neck of the double-sided vessel, sized to accommodate the forward branch (20) of the cryosurgical instrument, is bent further extended into the corner and the cylindrical wall (3) of the inner receptacle, while the outlet pipes (4 and 5) of the exhaust and relief valve open into the opposite corner between the cylindrical wall (3) and the lid (6) of the inner receptacle, the tube of the container neck (1) is sealed by a rubber ring (8) and rotatable by at least 180 °.