SU628906A1 - Cryosurgical apparatus - Google Patents

Description

(54) CRYOSURGERY DEVICE

one

The invention relates to medicine, in particular, to devices for the rapid local freezing of small objects used as a therapeutic surgical tool.

A cryosurgical device is known, which contains a tip, in the inner cavity of which a tubular heat exchanger with a choke, a handle, a pneumatic switch and a power source of a refrigerant 1 are placed.

The most significant drawbacks of such a device are the relatively low reliability of its operation, the inefficient heating of the tip, due to the insufficiently high temperature and the duration of the heating process.

The low reliability of this device is due to the fact that the purge provided for warming the tip is conducted through the throttle, which is inefficient due to the decrease in the refrigerant temperature and the limitation of the flow rate.

As a result, not all the frozen out impurities can be removed from the inner surface of the heat exchanger tube, which, when restarted, can cause a blockage of the throttle orifice. Thus, the reliability of this device is associated with charging the power supply unit with absolutely pure refrigerants, which is very difficult in medical facilities.

The process of heating in such a device is inefficient for the same reasons as cleaning, i.e. heating is carried out by throttled gas.m. at a reduced temperature.

The organization of the purge channel in this device greatly complicates its design by inserting an electric pneumatic valve of the purge and an additional pneumatic communication line into the power supply hose into the power supply unit, which makes it inconvenient for the operator to manipulate.

The circuit of the invention is to increase the reliability of the device operation by reducing the sensitivity to the purity of the refrigerant and providing forced heating of the tip.

Claims (1)

This is achieved by the fact that, in the proposed cryosurgical device, the heat exchanger is made in the form of a single spiral bifillary tube with a throttle hole at the junction from one spiral to another, connected with the direct flow of the refrigerant, and has an additional hole. located in a pneumatic switch for communicating with the atmosphere, the pneumatic switch being connected to both ends of the tube. The drawing schematically shows the proposed cryosurgical device, a general view. The device comprises a tip 1, in the inner cavity of which a tubular heat exchanger 2 is placed with a throttle 3, a handle 4, a pneumatic switch 5 and a power source 6 with a connecting hose 7. The pneumatic switch 5 is placed in the handle 4 and provided with a key 8 fixed by a latch 9 for control. The heat exchanger 2 is made in the form of a single spiral bifillary tube with a throttle bore 10 at the point of transition from one helix to another, connected with the direct flow of the refrigerant. In the pneumatic switch 5, there are two valves 11 and 12 and a chamber 13 with a throttle bore 14 interconnected with the atmosphere. Pneumatic switch 5 is connected to both ends of the spiral bifilical tube. Cryosurgery device operates as follows. The valve of the supply source 6 is opened and the refrigerant through the flexible connecting hose 7 is supplied to the pneumatic switch 5. When the button 8 is pressed, which is fixed by the latch 9, the valve 11 opens and the high pressure refrigerant of the heat exchanger 2 enters the spiral bifillary tube at ambient temperature which Exiting the throttle bore 10 and expanding, lowers its temperature. Since the refrigerant coming from the high-pressure source is in heat exchange with the refrigerant flowing countercurrent through the annular space of the tip 1, its temperature decreases and, after expansion, reaches the boiling point of the refrigerant after the throttle opening 10. Thus, the tip is cooled and the tissues in contact with it are frozen. Reheating the tip 1 or purging, if necessary, is as follows. After the second pressing of the key 8, the valve 12 organizes the flow of refrigerant sequentially through the spiral tube of the heat exchanger 2, the choke 3 to the chamber 13 and through the throttle hole 14 to the atmosphere. The proposed device works reliably when compressed medical oxygen or nitrogen containing trace impurities in the amount prescribed by the standard and supplied to clinics in conventional forty-liter cans under a pressure of 150 atm. Is used as a refrigerant. Purging the refrigerant through the tube of the heat exchanger and releasing it into the atmosphere through the throttle orifice, at least more than the similar in the heat exchanger, leads to rapid heating of the tip, within ten seconds, which is significantly less than in the known device. Claims A cryosurgical device comprising a tip, in the inner cavity of which a tubular heat exchanger with a choke, a handle, a pneumatic switch and a refrigerant power source are placed, characterized in nor is it made in the form of a single spiral bi-filar tube with a choke hole at the point of transition from one helix to another, associated with direct perspiration it has an additional opening located in the pneumoswitch to communicate with the atmosphere, the pneumoswitch being connected to both ends of the tube. Sources of information taken into account in the examination: 1. US Patent No. 3696813, cl. 128-303.1, 1972.