RU2702153C1 - Coolant supply device of cryosurgical apparatus to applicator - Google Patents

Abstract

FIELD: medical equipment.

SUBSTANCE: device relates to medical equipment and is intended for use in surgical operations with deep freezing of pathological tissues using liquid nitrogen. Device for coolant supply of cryosurgical apparatus into applicator comprises coolant supply system made in form of steam line and coaxially arranged movable and fixed tubes. Fixed tube is fixed in the steam pipeline, the movable tube enters the fixed one with minimum clearance, is made with possibility of movement inside the fixed tube along the whole length, pull-out for the applicator connection with the support into its bottom and insertion into the fixed tube with provision of coolant supply to the whole length of the applicator. Steam pipeline is designed so that to provide a tight connection with the applicator, and the movable tube is made with slots in the end part and holes in the side surface.

EFFECT: invention allows to expand functional capabilities of the device.

1 cl, 5 dwg

Description

The device relates to medical equipment and is intended for use in surgical operations using deep freezing of pathological tissues using liquid nitrogen.

Cryosurgery is a combination of surgical treatment methods based on local tissue freezing.

Cryosurgery is used in dermatology, neurosurgery, oncology, ophthalmology, otorhinolaryngology, abdominal surgery, urology, gynecology, pediatrics, etc.

Various cryosurgical devices have been developed for different operations in different anatomical areas.

The tasks of developing various designs of cryosurgical devices are providing access to the operated area, ensuring effective cooling of tissues to the required depth.

Cryotherapy devices are known (for example, RF patent 2472464, Austrian patents AT 409585, AT 409715, AT 409716), where one of the tubes of the supply element is fixedly mounted on the cryosurgical applicator or instrument and, when the applicator is installed on the cryosurgical apparatus, is connected to the tube a supply element mounted on a handle or transitional cryosurgical instrument. Such a device leads to a complication of the design of cryoapplicators, a narrowing of their functionality.

A medical cryo-applicator having a replaceable copper cannula tip with a thread on the walls of the internal cavity, which is mounted on the cannula using a transition sleeve with a threaded connection, is also known from the RF patent 85326. This device provides accurate localization of the tip on the fabric, but when using this device, uneven cooling of the fabric is possible.

From US Pat. No. 5,275,595, a cryo-applicator is known including an inlet and an outlet line, a Joule-Thomson valve, which provides an impact in areas where access is difficult. However, this device does not provide the possibility of using a set of applicators of various shapes for different anatomical areas and there is no possibility of uniform cooling of the working surface of the applicator.

A device is known (RF patent 2548319), which is a cryodestructor having a replaceable head mounted on the neck of the tank by means of a threaded connection, with a trigger mechanism for supplying liquid refrigerant mounted on a replaceable head in the form of a needle valve and a refrigerant supply pipe to which the replaceable tip is installed by carvings. This device provides ease of use, reducing the flow of refrigerant, but does not provide the ability to use a set of applicators of various lengths, which narrows its functionality.

The closest analogue of the proposed device is a device for cryosurgical exposure (application US 20140058370 A1), which contains a shell and a refrigerant supply system. When using this device, a flexible applicator with a movable (sliding) thermal insulation is used, covering the inoperative part of the applicator to protect healthy tissues.

The disadvantage of this device is the lack of sufficiently effective heat-insulating materials that can work at temperatures of liquid nitrogen, which does not allow the use of this refrigerant. In addition, this device is difficult in design.

The technical result is to expand the functionality of the device through the use of an expanded range of interchangeable applicators.

To achieve the technical result, a device is proposed for supplying the refrigerant of the cryosurgical apparatus to the applicator, comprising a shell and a system for supplying refrigerant, which is made in the form of a steam pipe and a fixed tube and a coaxially located flexible movable tube. The movable tube is movable inside the stationary tube along its entire length, slots are made on the end of the movable tube, and holes are made on the side surface of the movable tube.

In the particular case, the movable tube is made of plastic material with the possibility of bending along with the applicator.

In a particular case, the movable tube is configured to give it the shape of an applicator before installing it.

The fixed tube can be fixed in the steam line, for example, by means of a spacer, or by any other method known in the art.

The applicator and the movable tube can be made of plastic materials. In this case, they are initially in direct form. When preparing the intervention, they are given the necessary shape, for example, curved. After completion of the intervention, they can again be given a direct form. Applicators can have different lengths.

The design of the device is illustrated by illustrations.

The figure 1 shows a General view of the device in longitudinal section.

Figure 2 shows a view of the device before installing the applicator, with the movable tube extended.

In figures 3 and 4 shows a view of the device with the installed applicator, the movable tube is installed with emphasis on the end face of the applicator.

The figure 5 shows a view of the device installed in the applicator curved shape.

The device consists of a shell 1 and a refrigerant supply system. The refrigerant supply system is made in the form of a steam pipe 2, a fixed supply pipe 3 and a movable supply pipe 5. The steam pipe is installed in the handle or transition tool of the cryosurgical apparatus. Between the handle or the transitional instrument of the cryosurgical unit and the steam pipe there is thermal insulation, which in particular can be vacuum. The fixed supply pipe 3 is fixed in the steam line (for example, a spacer 4). The movable feed tube 5 enters the stationary feed tube with a minimum clearance, the movable and fixed tubes are installed coaxially.

The connection density of the movable and fixed tubes is ensured by the minimum clearance between them and the length of their connection.

To improve the flow of refrigerant into the applicator, slots 6 are made at the end of the movable tube, and holes 7 are made on its lateral surface.

To prevent complete immersion of the movable tube into the stationary one, stops or stops (not shown in the drawings) can be used.

In figures 3-5 shows the steam output 8, the working surface of the applicator 9, the input of the refrigerant 10, the applicator 11.

The device operates as follows.

The movable supply tube 5 extends a distance slightly greater than the depth of the connected applicator 11 (Fig. 2), then the applicator 11 is installed (Fig. 3, 4). The tightness of the connection of the applicator 11 with the steam line 2 is provided by any method known from the prior art, for example, as a cone-cylinder, fixing the applicator in the housing or adapter tool is provided by any method known from the prior art, for example, a threaded connection (not shown in the drawings). When installing the applicator 11, the end face of the movable tube 5 abuts against its bottom; as the applicator is installed, the movable tube moves into the stationary tube 3, thereby ensuring the supply of refrigerant to the entire depth of the applicator and uniform cryogenicity.

The proposed device can be used for any type, shape and size of applicators, simple in design, cheap and, most importantly, unlike analogues, reusable, including flexible. The design of the applicator itself becomes much simpler - it does not need a tube for connecting the applicator to the supply line of the device, because the refrigerant is supplied over the entire length of the applicator by means of a supply device, moreover, liquid nitrogen can be used as a refrigerant.

Claims (2)

1. A device for supplying refrigerant to a cryosurgical apparatus into an applicator containing a shell and a refrigerant supply system, characterized in that the refrigerant supply system is made in the form of a steam line and coaxially located movable and fixed tubes, while the fixed tube is fixed in the steam line, the movable tube enters the fixed with a minimum gap, made with the possibility of moving inside the fixed tube along the entire length, extending to connect the applicator with focus on its bottom and moving into the fixed a tube with the supply of refrigerant for the entire length of the applicator, while the steam line is configured to provide a tight connection with the applicator, and the movable tube is made with slots in the end part and holes in the side surface. 2. The device according to claim 1, characterized in that the movable tube is made of plastic material with the possibility of bending along with the applicator.

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