RU2438615C2 - Cryosurgical apparatus - Google Patents

Abstract

FIELD: medicine.

SUBSTANCE: invention refers to medical equipment, particularly a cryosurgical instrument which can be used in gynaecology, oncology, urology, neurosurgery, dermatology, cosmetology, as well as in general surgery. An apparatus comprises a cryoagent container with a vacuum thermal insulation, an L-shaped capillary tube with an operative tip with its vertical portion connected with the mentioned container, and its horizontal portion - with the operative tip, an atmospheric discharge nozzle for liquid-vapour mixture, a safety valve, a handle, a gate valve with a spring-assisted rod and a seat. A gate valve body comprises a liquid cavity connected with the cryoagent container through an inlet fitting, while an outlet fitting of the liquid cavity is connected with the vertical portion of the L-shaped capillary tube. From a side of the seat, a rod head comprises a ball seal blocking cryoagent supply through the inlet fitting. If the gate valve is open, the inlet and outlet fittings are connected through the liquid cavity of the gate valve. A back surface of the rod head represents a seal face which in the open position of a gate valve, resting on a seal bushing mounted in the body and interacting with the moving rod does not prevent the cryoagent ingress into a thermal zone of the rod drive executed in the form of the interacting handle, locking bushing, spring, closing sleeve.

EFFECT: invention allows increasing reliable performance of the apparatus ensured by air-tightness of the locking valve and thereby preventing frosting of the locking valve drive.

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Description

The invention relates to medical equipment, in particular to a cryosurgical instrument that can be used in gynecology, oncology, urology, neurosurgery, dermatology, cosmetology, as well as in general surgery.

Cryosurgical devices serve to destroy pathologically altered tissues due to their local freezing to ultralow temperatures, for example, to -170 ° C.

Known cryosurgical devices containing a container with a liquid cryoagent, in which a L-shaped capillary tube for supplying a cryoagent is installed, a vertical section of which is in communication with a cryoagent, and a working tip is installed at the end of the horizontal section, in addition, there is an outlet channel for the exit of gas resulting from boiling of the cryoagent due to heat inflows (US patent No. 5098428, 3739956, 4345598, 4693252; EP No. 0395307, DE No. 4007473; applications WO No. 2004012612, Russian Federation No. 98119377, Russian patents No. No. 2238694, 40880, 33862, 37312, 2053719 2034517, 2157133, 2251988, 2301043, ed. Certificate of the USSR No. 610524).

The closest in essence and design to the proposed device is a cryosurgical device according to the patent of the Russian Federation No. 2301043, M.cl.7: A61B 17/36. This cryosurgical unit contains a vacuum-insulated container for a cryoagent, a cartridge detachably connected to it, an L-shaped capillary tube, the vertical part of which passes through the cartridge and is in communication with the cryoagent of the container, and the horizontal part - with a probe tip, a gas exhaust pipe, and a pressure regulator mounted on the cartridge and at the inlet it is communicated through it with the aforementioned capacity, as well as with a gas discharge hole made in the pressure regulator housing, in the housing of which is also spring-loaded relative to of the pressure regulator body, a valve having a through axial channel and a tapered end interacting with a seat mounted at the inlet of the pressure regulator, in addition, the pressure regulator is equipped with an adjusting nut that compresses the adjusting spring and regulates the force of its compression, while the position of this nut is fixed by a lock nut, in the axial hole of these nuts on the thread missed a screw interacting with the valve.

The disadvantage of the proposed technical solution is the lack of reliability due to possible leaks of the cryoagent for sealing the drive of the shut-off valve.

The objective of the invention is to increase the reliability of the apparatus by ensuring the tightness of the shut-off valve and, as a consequence, the prevention of leaks of the cryoagent and freezing of the drive of the shut-off valve.

This problem is solved in that in a cryosurgical apparatus containing a container for a cryoagent with vacuum thermal insulation, a L-shaped capillary tube with an operating tip, the vertical part of which is in communication with the mentioned container and immersed in a cryoagent, and the horizontal part with an operational tip, a pipe for dumping vapor-liquid mixtures to the atmosphere, safety valve, handle, shut-off valve with a spring-loaded stem and seat, a fluid cavity is formed in the shut-off valve housing, which communicates with the tank for I have a cryoagent through the inlet pipe, and the outlet pipe of this fluid cavity is in communication with the vertical part of the L-shaped capillary tube, with a ball seal on the stem head on the seat side, in the closed position of the shut-off valve, blocking the flow of the cryoagent through the inlet pipe, and when open the inlet and outlet valves of the shutoff valve are communicated through the liquid cavity of the shutoff valve, while the rear surface of the stem head is made in the form of a sealing surface, which the open position of the shutoff valve, abutting against the sealing sleeve installed in the housing and interacting with the rod during its movement, does not allow the cryoagent to enter the warm zone of the rod drive, made in the form of interacting handles - locking sleeve - spring - pressure sleeve.

In Fig.1 shows a cryosurgical apparatus, and in Fig.2 - view A with a closed shut-off valve, Fig.3 and 4 - view A with a closed and open shut-off valve, where:

1 - capacity for cryoagent;

2 - the neck of the tank for the cryoagent;

3 - sealed housing;

4 - bayonet connection;

5 - consolidation;

6 - L-shaped capillary tube;

7 - operational tip;

8 - pipe discharge of the vapor-liquid mixture into the atmosphere;

9 - safety valve;

10 - handle;

11 - shutoff valve;

12 - valve body;

13 - a saddle;

14 - stock;

15 - inlet pipe;

16 - liquid cavity of the shutoff valve;

17 - outlet pipe;

18 - ball seal;

19 - sealing sleeve;

20 - persistent nut;

21 - spring;

22 - pressure sleeve;

23 - locking sleeve;

24 - emphasis;

25 - a nut with a lock nut;

26 - a stub;

27, 28 - stenels;

29 - rear sealing surface of the rod head.

The proposed cryosurgical apparatus includes a container for cryoagent 1 with vacuum thermal insulation. In the neck of the container for cryoagent 2, by means of a bayonet connection 4, a sealed housing 3 is sealed, in which a L-shaped capillary tube 6 is placed, the vertical part of which is inserted into the container for cryogen 1, while the sealed housing 3 is isolated from the container for cryoagent 1.

The horizontal part of the L-shaped capillary tube 6 is equipped with a removable operating tip 7. The configuration of the operating tip 7 is optimally adapted to the anatomical shape of the pathological formation, the operating tips are diverse in shape and size and are attached to the L-shaped capillary tube 6 on the thread and are sealed, for example, with using fluoroplastic sleeve.

The shut-off valve 11 has a handle 10. In the shut-off valve 11, a saddle 13 is installed at the inlet, with which the stem 14 interacts in the closed state, and its opposite end is spring-loaded with a spring 21, with which the push sleeve 22 interacts, regulating the compression force of the spring 21. The stem 14 interacts when moving with a sealing sleeve 19 installed in the housing 12 and preloaded by a thrust nut 20. In the housing of the shutoff valve 11, a fluid cavity 16 is formed, which communicates with the capacity for the cryoagent 1 through the inlet pipe 15, and the outlet pipe 17 of this fluid cavity 16 is in communication with a L-shaped capillary tube 6, and a ball seal 18 is made on the rod head 14 from the seat 13 side. In the closed position, the shut-off valve 11 blocks the flow of the cryoagent through the inlet pipe 15, and when the shut-off valve is in the open position, the inlet 15 and outlet 17 nozzles are communicated through the liquid cavity of the shutoff valve 16, while at the same time, the rear sealing surface of the rod head 29, abutting against the sealing sleeve 19, does not allow the cryoagent to get into it in the warm the area of the actuator rod 14, made in the form of interacting handles 10 - locking sleeve 23 - spring 21 - pressure sleeve 22.

The shut-off valve body 12 on the side of the handle 10 is closed by a plug 26. The cryoagent container 1 is double-walled with high vacuum insulation, tightly sealed after evacuation using a clamped and welded plug 27. The horizontal end of the L-shaped capillary tube 6 is also double-walled with high vacuum insulation, hermetically sealed sealed after evacuation using a pinched and brewed plug 28. To protect the device from increasing pressure, a safety valve 9 is introduced.

The proposed cryosurgical apparatus operates as follows.

This unit is a consumable type system built on the principle of using the heat of boiling of low-temperature liquids.

The shut-off valve 11 with the handle 10 has two extreme positions: when the handle 10 is pressed, the rod 14 goes back, the shut-off valve 11 opens and liquid nitrogen enters through the inlet pipe 15 from the cryogenic agent container 1 into the liquid cavity of the shut-off valve 16 and into the outlet pipe 17, and then into the L-shaped capillary tube 6 and the operating tip 7, cooling it.

At the same time, the rod 14 with its rear sealing surface 29 abuts against the sealing sleeve 19, preventing the cryoagent from getting into it in the warm zone of the shut-off valve actuator 11, made in the form of interacting handles 10 - locking sleeve 23 - spring 21 - pressure sleeve 22.

In the closed position of the shut-off valve 11, the handle 10 is released and under the action of the spring 21, the pressure sleeve 22 presses the rod 14 against the seat 13, blocking with the help of a ball seal 18 the line of entry of the cryoagent, for example liquid nitrogen, through the inlet pipe.

This technical solution allows you to seal the warm area of the shut-off valve actuator, to prevent freezing, thus eliminating the possibility of jamming of the shut-off valve stem and thereby improves the reliability and service life of the cryosurgical apparatus, while it is very simple to manufacture, given the small size of the apparatus.

The device can be operated both in stationary conditions and in outpatient as well as field conditions.

An experimental sample of the proposed apparatus has passed clinical trials, received positive conclusions and is recommended for serial production and use in clinical practice. The experimental sample runs on liquid nitrogen, the depth of freezing (from 90 ° C to 170 ° C, depending on the type of operation), in the model medium for the first 300 seconds at least 8 mm, the time to reach the operating temperature mode of not more than 2 minutes, the time is continuous work with a single refueling for at least 5 minutes, operating pressure 0.3-05 × 10 ⁵ Pa, pressure of the safety valve 0.7 × 10 ⁵ Pa, apparatus weight ≈0.95 kg (without liquid nitrogen).

Claims (1)

A cryosurgical device containing a container for a cryoagent with vacuum thermal insulation, a L-shaped capillary tube with an operating tip, the vertical part of which is in communication with the mentioned capacity, and the horizontal part with an operating tip, a pipe for dumping the vapor-liquid mixture into the atmosphere, a safety valve, a handle, a shut-off valve with a spring-loaded stem and seat, characterized in that a liquid cavity is formed in the shut-off valve housing, communicating with the cryogen container through the inlet pipe, and the outlet pipe of this liquid cavity is in communication with the vertical part of the L-shaped capillary tube, with a ball seal on the stem head on the seat side, in the closed position of the shut-off valve, blocking the flow of the cryoagent through the inlet pipe, and when the shut-off valve is open, the inlet and outlet pipes communicated through the liquid cavity of the shutoff valve, while the rear surface of the stem head is made in the form of a sealing surface, which in the open position of the shutoff valve and, resting against a sealing sleeve installed in the housing and interacting with the rod during its movement, does not allow the cryoagent to enter the warm zone of the rod drive, made in the form of interacting handles, locking bushings, springs, pressure bushings.

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