SU865286A1 - Device for local cryoeffect - Google Patents

Description

(54) DEVICE FOR LOCAL CRITICAL IMPACT

I

The invention relates to medical technology, in particular to devices for local cryotherapy, and can be used to produce destruction or stop bleeding.

A device for local cryosurgery is known, which contains a tank filled with a liquefied refrigerant under excessive pressure and heat exchangers with channels (tubes) for supplying a liquid refrigerant and draining the gaseous refrigerant. The operation of the device consists in forcing the refrigerant under pressure through the heat exchange channels 1.

However, this device does not provide regulated cryogenic effects.

Closest to the proposed technical entity is a device for local cryogenic, containing a reservoir for liquefied refrigerant with a lid, having an opening for the vapor outlet, tip, tube for supplying liquefied refrigerant to the tip, steam discharge tube, ejector, installed in the hole of the lid with movement along the axis of the vapor tube.

the end of which is located in the narrow part of the ejector with a gap for the release of refrigerant vapor from the tank. In the known device, there is an evaporating circuit with forced refrigerant movement, which is effected by suction of the refrigerant vapor ejector from the evaporation zone into the atmosphere and replacing the vapor with a liquefied refrigerant. The working fluid in the ejector is the vapor of the refrigerant itself, which forms in the tank due to natural heat influxes from the environment. The amount of suction vapor is regulated by moving the ejector through the adjusting sleeve relative to the opening of the vapor tube 2.

t5 The disadvantages of the known device are the impossibility of a quick cessation of cryosurgery and thus the elimination of tissue freezing, as well as low freezing capacity.

The purpose of the invention is the rapid cessation of cryotherapy and the elimination of freezing of the tissue.

This goal is achieved by the fact that a device for local cryosurgery containing a container for liquefied refrigerant, equipped with a lid with an opening for accommodating a guide sleeve, a pipe for supplying liquefied refrigerant, a vapor tube and a hollow tip, is additionally equipped with a heat pipe and a locking screw installed in the guide sleeve can move along the axis of the steam discharge tube to block its outlet opening, while a cover with opening is mounted on the output end of the steam discharge tube The heat pipe is located inside the latter, while its evaporation zone is adjacent to the end of the hollow tip. By means of such an arrangement of the device, the volume of the charge from the gaseous refrigerant, which is located between the evaporation zone and the steam discharge tube, is regulated by blocking the outlet of the steam discharge tube with a screw; Since the same temperature is established along the entire length of the heat pipe and the heat supply from the heat pipe to the evaporation zone is stopped, the cryoinfluence stops faster. In addition, since the heat pipe simultaneously serves as a generator of forced refrigerant movement, the freezing capacity of the device is increased. The drawing schematically shows the proposed device, a longitudinal section. The device for local cryogenic treatment includes a reservoir 1 for a liquefied refrigerant with a lid 2, a guide sleeve 3, a locking screw 4, a refrigerant gas discharge pipe 5, a liquefied gas supply pipe 6, a heat pipe 7, a heat pipe cover 8 7, a tip 9 In the cover 2 and the guide sleeve 3 there is a channel 0. The device is equipped with a pump 11. The heat pipe is made without a transport zone, which virtually eliminates the possible temperature difference between the evaporation zone and the condensation zone and thereby increases the effect cooling capacity. The cover (casing) 8 covers the entire outer surface of the heat pipe condensation zone. Between the cover 8 and the surface of the condensation zone of the heat pipe 7 there is a space for movement of the refrigerant, behind the condensation zone the casing is connected to the refrigerant gas exhaust pipe 5. The cover 8 is connected to the tip and has in its lower part openings 12 for access of the refrigerant. The cap 2 has an opening for the refrigerant vapor to escape from the volume of the tank into the volume 13 of the guide sleeve 3. In the free volume 13 of the sleeve 3, a vapor tube 5 ends. The same volume 13 includes part of the locking screw 4 with the possibility of its rotation. The proposed device works as follows. Liquid nitrogen is poured into reservoir 1, which cools the adsorbent inside pump 11, thereby improving the evacuation of the insulating jacket of tube 6. Next, the tank is closed with cap 2, and the steam discharge tube 5 enters the opening of the guide sleeve 3 and then into the free volume 13 of this bushings, which also include refrigerant vapor generated in the tank volume. Liquid nitrogen fills the space between the vapor tube 5 and the wall of the tube 6, then enters the space between the cover 8 and the wall of the tube 6. Reaching the hole 12 in the cover 8, liquid nitrogen washes the heat pipe 7 and as a gas phase goes through the vapor tube 5, the free volume 13 is directed by the sleeve 3 and further along channel 10 to the atmosphere. When the liquid refrigerant moves along the heat pipe 7, it cools and, consequently, condenses the gaseous nitrogen, which causes the start of the heat pipe, then the evaporation-condensation processes cool the tip to the temperature of liquid nitrogen. After this cooling the cryotool is ready for operation. The operation mode is maintained due to the fact that there is a continuous cooling of the condensation zone of the heat pipe by moving cooling nitrogen. Nitrogen gas evaporating on the surface of the heat pipe during natural convection moves along pipe 5 for evacuating the gaseous refrigerant from reservoir 1 to the atmosphere. To stop cooling the cryoinstrument, it is sufficient to stop the access of the liquid refrigerant to the condensation zone of the heat pipe, which is done by closing the outlet of the refrigerant gas discharge pipe 5 when the locking screw 4 is moved relative to the guide sleeve 3. In this case, a leak occurs from the refrigerant gas between the evaporation zone. and a vapor tube, in connection with which the same temperature is established over the entire length of the heat pipe, and consequently, a rapid discontinuity occurs. s cryotherapy. Due to the fact that the area of the outer surface of the heat pipe exceeds the area of the evaporation zone, the heat sink through the heat pipe is increased to such values that the heat pipe becomes a generator of the movement of the refrigerant in the device. This increases the freezing capacity of the device. The proposed device greatly expands the possibility of conducting operations in which it is necessary to strictly control the process of cryogenic exposure.

Claims (1)

Claim A device for local cryotherapy containing a container for liquefied refrigerant, equipped with a lid with a hole for accommodating the guide sleeve, a tube for supplying liquefied refrigerant, a steam outlet tube and a hollow tip, characterized in that, in order to quickly stop cryotherapy and thereby prevent freezing of the fabric, and also increase the freezing ability, the device is additionally equipped with a heat pipe and a locking screw, installed VNIIIPI Order 7913/8 Circulation 690 Branch of the PPP "Patent", Uzhgorod, st. in the guide sleeve with the possibility of moving along the axis of the steam outlet pipe to block its outlet, while a cover with holes is mounted on the input end of the steam outlet pipe, and the heat pipe is located inside the latter, while its evaporation zone is adjacent to the end face of the hollow tip.