RU157669U1 - CANULA FOR INTRAOCULAR ADMINISTRATION AND ASPIRATION OF DYES DURING CHROMITOVRECTOMY - Google Patents

Abstract

A cannula for intraocular administration and aspiration of dyes during chromovitrectomy, containing a fixation and a working part, characterized in that the working part is made in the form of a hollow tube made of steel with a rounded section, 35 mm long, 0.5 mm in diameter; the working end of the tube is made blunt and completely rolled; a hole with a diameter of 0.5 mm is located on the side surface of the tube 1.0 mm from the working end; the fixing part has a Luer Lock system.

Description

The utility model relates to the field of medicine, and more particularly to ophthalmic instruments used for the introduction and aspiration of intraocular dyes during chromovitrectomy, mainly for contrasting epiretinal membranes and the inner border membrane.

Contrasting and removing the epiretinal membranes and the inner border membrane is one of the laborious and delicate operations carried out on the retina.

Known surgical instrument made in the form of a direct standard cannula for the introduction of drugs and contrast agents (Catalog "Titan Medical", 2012, Cannula retinal straight, with 6).

The disadvantage of this tool is the increased complexity, inconvenience of use, the possibility of tissue injury.

Known surgical cannula for the introduction and aspiration of solutions (Catalog "MedOne", 2014, Standard vitreoretinal cannula, with 4).

The disadvantage of this cannula is the inconvenience of use and the possibility of injury.

A known cannula with a silicone tip containing a silicone insert at its working end (Catalog "Alcon", 2013, Cannula with a silicone tip, p. 17).

The disadvantage of this cannula is the inconvenience and increased complexity of use.

A known tool for the introduction and aspiration of the dye during removal of the inner border and epiretinal membranes. The dual action of the instrument is achieved by placing a shunt between the tip and the needle supplying the infusion fluid. The shunt is connected to a silicone tube, which, in turn, is connected to a syringe filled with a dye. To introduce the dye, you must use your finger to block the hole located on the surface of the shunt (4. R. Brinken, S. Schmitz-Valckenberg, FG Holz. A novel instrument for dye injection and aspiration aiding the removal of internal limiting membranes and epiretinal membranes // Retina. - 2013. - Vol. 33 - P. 2180-2181 - prototype).

The disadvantage of this device is the ability to remove only one drug, as well as the complexity, inconvenience of use and the associated increased invasiveness.

The purpose and objective of the utility model is to simplify the design and reduce the complexity and trauma during the introduction and aspiration of intraocular dyes, mainly for contrasting epiretinal membranes and the inner boundary membrane

The technical result achieved by using the utility model is to reduce the morbidity (trauma to the intraocular structures) during the administration and removal of drugs for contrasting the epiretinal membranes and the inner border membrane during chromovitrectomy.

The technical result according to the invention is achieved due to the design of the cannula, which consists of the fixation part of the cannula and the working part of the cannula. The working part is a hollow tube with a rounded cross-section, made of steel, with a blunt working end, which is completely rolled; while on the side surface of the tube at a distance of 1.0 mm from the working end, a hole with a diameter of 0.5 mm is made for the introduction and aspiration of a contrasting preparation. The fixation part of the cannula can be mounted on a syringe with a ready-made preparation for use or on a special instrument with the Luer Lock system.

The working part of the cannula has a length of 35 millimeters, for work in emmetropic and myopic eyes, and is made with a diameter of 0.5 mm.

The distinguishing features of the utility model in comparison with the closest analogue are as follows:

- the working part of the cannula is made in the form of a hollow tube of steel;

- the working end of the cannula is made blunt and completely rolled;

- on the side surface of the cannula at a distance of 1.0 mm from the working end, a hole with a diameter of 0.5 mm is made;

- the working part of the cannula has a length of 35 mm, a diameter of 0.5 mm

The utility model is illustrated by graphic material (Fig. 1), which shows the proposed device.

The utility model contains a fixing part (1) with a Luer Lock system for reliable connection with a reflux handle or syringe and a working part (2) made in the form of a hollow steel tube.

The working end of the cannula (3) is made blunt and completely rolled. On the lateral surface of the working part of the cannula 1.0 mm from the working end there is an opening (4) with a diameter of 0.5 mm through which preparations are introduced and aspirated to contrast the epiretinal membranes and the inner border membrane.

When contrasting epiretinal structures, mainly epiretinal membranes and the inner boundary membrane, the proposed device is used as follows.

After the visual determination of the places of contrast, the cannula is brought to the proposed site of contrast and the drug is supplied for contrast. The working end 2 is brought to the place of contrast and a contrasting preparation is fed through the side opening 4.

A feature of this device is that the drug is fed through a side hole having a size of 0.5 mm, which prevents the development of the effect of "water hammer" at the proposed place of contrast of the retina (reduces trauma). If necessary, depending on the type of drug used, due to the fixation end with the Luer Lock system, a reliable connection with a reflux handle or a ready-made syringe with the drug is possible.

The length of 35 mm and the diameter of the working part of 0.5 mm also allow minimizing the invasiveness of the intervention when working on emmetropic and myopic eyes.

The proposed device is simple in design and reliable in operation. Its use allows trauma to contrast the alleged areas of epiretinal tissues and the inner border membrane without trauma.

Examples of using the utility model:

Example 1:

To contrast the epiretinal structures, the proposed device is attached by the fixation part (1) to the syringe with the preparation for contrasting, after visual determination of the places of contrasting, the working end of the cannula (3) is brought to the proposed site of contrasting and through the side opening (4) the preparation for contrasting is supplied. After the epiretinal structures are contrasted, the excess drug is removed through the side opening (4) with the same syringe.

Example 2:

To contrast the epiretinal structures, the proposed device is attached with the fixation part (1) to the reflux handle, a preparation is drawn for contrasting by active aspiration inward, after visual determination of the places of contrasting, the working end of the cannula (3) is brought to the proposed site of contrasting and through the side hole (4) it is fed preparation for contrasting by active irrigation. After the epiretinal structures are contrasted, the excess drug is removed through the side hole (4) with the same reflux handle by active aspiration.

Claims (1)

A cannula for intraocular administration and aspiration of dyes during chromovitrectomy, containing a fixation and a working part, characterized in that the working part is made in the form of a hollow tube made of steel with a rounded section, 35 mm long, 0.5 mm in diameter; the working end of the tube is made blunt and completely rolled; a hole with a diameter of 0.5 mm is located on the side surface of the tube 1.0 mm from the working end; the fixing part has a Luer Lock system.

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