RU146185U1 - MICRO HOOK - A TRAP FOR EXTRACTING THREAD FROM THE FRONT EYE CAMERA - Google Patents

Abstract

1. Microhook for removing the thread from the anterior chamber of the eye, containing the handle and placed to it at an angle of 120-130 °, circular in cross section, the working part that ends with a flat trap for the thread, located in the same plane with the handle: vertically rotated, and the groove for the filament to be trapped, it is located below, at a distance of 0.45-0.5 mm from the distal end of the trap, characterized in that the flat trap is a distal end of the working part of the hook twisted into a cochlea counterclockwise, while the angle of twist is 360–380 ° from the longitudinal axis of the working part, and the trap turns located in one plane have a gap between them, which allows the filament to be trapped freely, and the lower turn of the trap is on a straight line with the working part of the micro hook. 2. The micro hook according to claim 1, characterized in that the groove for inserting the thread is formed by turns of the trap. 3. The micro-hook according to claim 1, characterized in that the working part round in cross section smoothly tapers to a cone towards the distal end. The micro-hook according to claim 1, characterized in that the end face of the distal end of the working part of the micro-hook is smoothly rounded.

Description

The proposed utility model relates to instruments used in medicine, in particular in ophthalmic surgery during suture procedures, such as removing the thread from the anterior chamber of the eye.

Usually in ophthalmosurgery, in order to perform surgical operations in the anterior chamber, a universal surgical instrument is used - the lower micro hook for the iris (Medin-Ural catalog // Microsurgical instrument. - Yekaterinburg. - 2012. - M819T). Structurally, it is a microhook, round in cross section, which gradually tapers to a cone to the distal end. Its distal end is bent in an arc, and the bend is made more than half the circumference, and the end of the hook represents a thickening of a spherical shape: a bulb, which acts as a retainer for the thread.

A microhook of this design is used for reconstructive procedures for suturing, for suture fixation of intraocular lenses, rings, and manipulations with the iris. It is with this design that the micro-hook in practice leads the thread 10.0 out of the anterior chamber of the eye through corneal paracentesis (Fedorov S.N., Egorova E.V. Violation of the position of the IOL in the eye // Errors and complications in implantation of an artificial lens. - Moscow. - 1992 - S. 240).

Due to the fact that this microhook at the time of its removal outward with a caught thread repeatedly clings to the edges of the corneal paracentesis (in previous years, the incisions were longer and this design was satisfactory), a special microhook was developed in our center for more atraumatic removal of the thread from the front eye chambers (Patent PM PM No. 138383 - Prototype). Structurally, it presents a vertically oriented flat spatula-trap with a rounded end; the groove for introducing the thread into the trap is made from the bottom and directed upward, while the groove width is 0.1 mm. The groove is located at a distance of 0.45-0.5 mm from the distal end of the spatula, and the upper edge of the groove passes into an oval hole, elongated along the longitudinal axis of the tool. The lower edges of the groove are rounded. The thickness of the working part of the spatula is 0.2 mm.

Disadvantages of micro hook construction.

1. Since the groove has a width of only 0.1 mm (only the small size of the groove allows you to exclude jamming of the corneal tissue in it), with a thickness of the working part of the spatula of 0.2 mm, it becomes technically difficult to get a thread into it when it is oblique relative to the longitudinal axis tool.

2. With the existing design, it is impossible to completely exclude right angles in the instrument, therefore, in some cases, not the corneal tissue is infringed, but the conjunctiva at the exit of paracentesis, which makes it difficult to manipulate the instrument.

The objective of the utility model is to develop a microhook for removing the thread through paracentesis, the design of which will provide an easy grip of the thread at any tilt to the tool and as much as possible eliminates the problems of hooking the hook to the surrounding tissue when it is brought out.

EFFECT: using a new micro hook construction, the thread is easily trapped, held securely and brought out, while the walls of paracentesis are not injured, the time of surgery is reduced.

The specified technical result can be obtained if the microhook for removing the thread from the anterior chamber of the eye containing the handle and the working part, round in cross section, placed to it at an angle of 120-130 °, which ends with a flat thread trap located in the same plane with the handle, while the trap is vertically rotated, and the groove for introducing the thread into the trap is located below, at a distance of 0.45-0.5 mm from the distal end of the trap, according to the new design, the flat trap is twisted into a snail against the clock arrows the distal end of the working part of the hook, while the twist angle is 360 ° -380 ° from the longitudinal axis of the working part, and the turns of the trap, being in the same plane, have a gap between them, which allows the thread to be trapped freely, and the lower turn of the trap is on one straight line with the working part of the micro-hook.

Clarifying features of a utility model:

- the groove for the establishment of the thread is formed by turns of the trap;

- the round working section in section smoothly tapers to a cone to the distal end;

- the end face of the distal end of the working part of the micro-hook is smoothly rounded.

Among the essential features of a utility model, the following are distinguishing:

- a flat trap is a distal end of the working part of a micro-hook twisted into a cochlea counterclockwise,

- the twist angle is 360 ° -380 ° from the longitudinal axis of the working part,

- the turns of the trap, located in the same plane, have a gap between them, ensuring the free entry of the thread into the trap,

- the lower coil of the trap is on one straight line with the working part of the micro-hook.

Between the totality of essential features and the achieved technical result, there is a causal relationship.

The micro-hook-trap is a distal end of the working part of the hook twisted into a cochlea, counterclockwise, while the twist angle is 360 ° -380 ° from the longitudinal axis of the working part. An oval design of the trap was created without any angles, ribs, which excludes injury to the tissues of the anterior chamber and directly to the tissues of paracentesis when the trap with the captured thread is pulled out. If the distal end of the working part is twisted less than 360 °, then the thread trapped in the groove will not be held securely in the trap when the tool moves, and if it is more than 380 °, this is an unnecessary accumulation that will increase the dimensions of the tool. The trap itself, formed by turns of the distal end of the working part, is flat, i.e. all turns forming a trap are located in one plane. Moreover, the plane in which the trap is located is in the same plane with the handle, while the trap is vertically rotated. The groove for introducing the thread into the trap is located below, at a distance of 0.45-0.5 mm from the distal end of the trap, it is formed by turns of the trap. In order for the micro-hook-trap not to cling to paracentesis tissue during the removal of the hook, the lower turn of the trap should be on the same line with the rectilinear working part of the micro-hook. If the coil will protrude beyond the rectilinear working part, the cornea will rush into the groove for the thread. If the coil is recessed, relative to the rectilinear working part, this increases the dimensions of the tool.

The micro-hook-trap is shown in the sketch, where item 1 is the handle; pos.2 - the working part, which is located to the handle at an angle of 120-130 ° and is a round rod, gradually tapering to a cone to the distal end. In this case, the distal end is twisted counterclockwise into the cochlea and forms a structure - a flat trap pos. 3, located on its plane in the same plane with the handle, while the trap is vertically turned, the groove for introducing the thread is formed by turns of the trap and is located below. The twist angle is 360 ° -380 ° from the longitudinal axis of the working part, and the trap coils, located in the same plane, have a gap between them, which allows the filament to be trapped freely, and the lower trap coil is on a straight line (A) with the micro hook hook . The height of the trap is 0.7 mm, which is commensurate with the size of the section (paracentesis) through which it will be displayed (1-1.2 mm).

The micro-hook is used at the stages of reconstructive surgery and at the stages of suture fixation of various elements to bring the thread out (mainly a monofilament thread 10.0). For this, the micro-hook is inserted through paracentesis into the anterior chamber, tilted with a groove in the direction of the thread and the thread is inserted into the groove in a direction from the angle of the front chamber to its center and out (from the front chamber), causing the thread to tension and move in a spiral. Then the micro-hook with the thread is brought out.

In our Center, 5 micro-hooks-traps were made, all of them are used in the operating room. The micro hook design allows you to quickly capture the thread into the trap. The oval shape of the trap provides atraumatic removal of the trap with a thread through paracentesis to the outside. This stage of surgery, thanks to the new micro-hook design, is quick, atraumatic, and does not strain the surgeon.

Claims (4)

1. Microhook for removing the thread from the anterior chamber of the eye, containing the handle and placed to it at an angle of 120-130 °, circular in cross section, the working part that ends with a flat trap for the thread, located in the same plane with the handle: vertically rotated, and the groove for the filament to be trapped, it is located below, at a distance of 0.45-0.5 mm from the distal end of the trap, characterized in that the flat trap is a distal end of the working part of the hook twisted into a cochlea counterclockwise, while the angle of twist is 360–380 ° from the longitudinal axis of the working part, and the trap turns located in the same plane have a gap between them that allows the filament to be trapped freely, and the lower turn of the trap is on a straight line with the working part of the micro hook. 2. The micro-hook according to claim 1, characterized in that the groove for introducing the thread is formed by turns of the trap. 3. The micro-hook according to claim 1, characterized in that the working section round in cross section smoothly tapers to a cone towards the distal end. 4. The micro-hook according to claim 1, characterized in that the end face of the distal end of the working part of the micro-hook is smoothly rounded.

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