RU161541U1 - SECONDARY CATARACT TREATMENT CANULA - Google Patents

Abstract

The cannula for the treatment of secondary cataract is a curved hollow metal tube with an external diameter of 0.6 mm, having an end for connecting to an aspiration device and a working end with an opening, characterized in that it has a length of at least 30 mm, an inner diameter of 0.4 mm, the working end of the cannula is bent with a radius of curvature of 3 mm; on the side facing the bend of the working end, the cannula is sharpened by half the diameter at an angle of 30 ° for 3 mm with the formation of a hole, an upper blunt edge and a lower pointed edge; at a distance of at least 10 mm from the working end of the cannula has a bend at an angle of 105 °.

Description

The utility model relates to medicine, namely to ophthalmology, and can be used in the surgical treatment of patients with secondary cataract for cleaning the posterior lens capsule.

The most common form of secondary cataract is clouding of the posterior capsule after cataract extraction, caused by proliferation and migration of residual epithelial cells that line the posterior capsule and take the form of vacuoles, the so-called “pearls” or “balls” of Adamuk-Elschnig. Secondary cataract is subject to surgical treatment. Usually produce dyscision of the posterior lens capsule, on which Adamyuk-Elshnig balls are placed. The operation can be carried out using a laser beam. In this case, secondary cataract is destroyed within the pupil. A hole with a diameter of 2.0-2.5 mm is formed. The disadvantage of these operations is that the remains of the lens masses, although they are removed from the optical zone, remain inside the eye, where they can cause an inflammatory reaction or get into the corner of the anterior chamber and block the outflow paths of intraocular fluid, thereby leading to ophthalmic hypertension.

We offer a device for removing Adamyuk-Elschnig's balls and other epithelial formations on the posterior lens capsule.

The prototype of this device is a Simco cannula (1), which is a tube with a blind rounded working end with a hole and an end for connection to an aspiration system; its total length is 43 mm, diameter 0.6 mm. Removing the balls of Adamyuk-Elschnig is carried out as follows: first, with a spatula or other cannula, the back capsule is cleaned of the cells, and then they are aspirated using a Simko cannula.

The disadvantages of this device are the impossibility of the most complete cleansing of the back capsule from Adamyuk-Elshnig balls and the remains of loose crystalline masses, the absence of a crystalline mass storage, which may lead to some of them remaining in the eye and causing the above complications.

The technical result of using the proposed device is the removal of Adamyuk-Elshnig balls and other loose epithelial formations from the posterior lens capsule.

This result is achieved in that the tube has a length of at least 30 mm, an inner diameter of 0.4 mm, the working end of the cannula is bent with a radius of curvature of 3 mm; on the side facing the bend of the working end, the cannula is sharpened by half the diameter at an angle of 30 ° for 3 mm with the formation of a hole, an upper blunt edge and a lower pointed edge; at a distance of at least 10 mm from the working end of the cannula has a bend at an angle of 105 °.

The advantages of this device are as follows. The tube has a length of at least 30 mm, which allows convenient access and manipulation inside the eye. The inner diameter of the tube is 0.4 mm, which contributes to good aspiration of the lens masses. The end of the cannula is bent with a radius of curvature of 3 mm, which prevents the masses from spreading through the chamber, and allows this part to be used as an accumulator of lens masses. The cannula is sharpened at an angle of 30 ° for 3 mm with the formation of an opening through which the lens masses are aspirated and two edges, the edge of the upper edge is blunt so as not to injure the eye tissue when the instrument is inserted inside, and the lower edge is pointed, which allows you to clean the back lens capsule from Adamyuk-Elshnig cells and loose lens masses. At a distance of at least 10 mm from the working end of the cannula has a bend at an angle of 105 °, which allows access and work throughout the posterior lens capsule.

The cannula for the treatment of secondary cataract is a curved hollow metal tube with an external diameter of 0.6 mm, having an end for connection with an aspiration device and a working end with an opening. The cannula has a length of at least 30 mm, an inner diameter of 0.4 mm, the working end of the cannula is curved with a radius of curvature of 3 mm; on the side facing the bend of the working end, the cannula is sharpened by half the diameter at an angle of 30 ° for 3 mm with the formation of a hole, an upper blunt edge and a lower pointed edge; at a distance of at least 10 mm from the working end of the cannula has a bend at an angle of 105 °.

The utility model is illustrated by graphic material. The figure 1 shows the proposed device, side view. The figure 2 shows the proposed device, a top view. The cannula for the treatment of secondary cataract is a curved hollow metal tube (1) with an external diameter of 0.6 mm, having an end (2) for connection with an aspiration device and a working end (3), which is bent with a radius of curvature of 3 mm. On the side facing the bend of the working end (3), the cannula is sharpened by half the diameter at an angle of 30 ° for 3 mm with the formation of a hole (4), the upper blunt edge (5) and the lower pointed edge (6); at a distance of at least 10 mm from the working end (3) the cannula has a bend (7) at an angle of 105 °.

The device is used as follows. Access is through a tunnel section, thanks to a tube length of at least 30 mm; the edge of the upper edge is blunt so as not to injure the eye tissue when the instrument is inserted inside, and the lower edge is pointed, which allows the back capsule of the lens to be cleaned of Adamyuk-Elshnig cells and loose lens masses. The curved working end of the tool serves as a storage device for the lens masses and Adamuk-Elschnig balls, where they are immediately aspirated by a vacuum system attached to the tool.

Clinical example.

Patient C, 55 years old, underwent phacoemulsification of cataract of the right eye with implantation of a posterior soft intraocular lens for age-related cataract on May 20, 2014. At discharge, visual acuity was 1.0.

In February 2015, the patient complained of decreased vision in his right eye. On examination, visual acuity was 0.2, and biomicroscopy revealed proliferation of lens epithelial cells along the entire posterior surface with the formation of Adamyuk-Elshnig spheres. On February 18, 2015, an operation was performed - removal of Adamyuk-Elshnig balls from the posterior lens capsule using the proposed cannula. The operation and the postoperative period - without complications.

Subsequent biomicroscopy of Adamyuk-Elshnig balls and other loose epithelial formations of the posterior lens capsule was not found. Visual acuity at discharge was 1.0.

This useful model for the treatment of secondary cataract can be widely used in medical ophthalmology departments of multidisciplinary hospitals and specialized ophthalmological clinics.

1) LLC "MEDTECHNIKA" Production - technical association. Product Catalog → Instruments for Ophthalmology / Aspiration - Irrigation / Cannula / Suction cannula by Simko http://www.medtech.ru/catalog/ophthalmology/section.php?SECTION_ID=472

Claims (1)

The cannula for the treatment of secondary cataract is a curved hollow metal tube with an external diameter of 0.6 mm, having an end for connection with an aspiration device and a working end with an opening, characterized in that it has a length of at least 30 mm, an inner diameter of 0.4 mm, the working end of the cannula is bent with a radius of curvature of 3 mm; on the side facing the bend of the working end, the cannula is sharpened by half the diameter at an angle of 30 ° for 3 mm with the formation of a hole, an upper blunt edge and a lower pointed edge; at a distance of at least 10 mm from the working end of the cannula has a bend at an angle of 105 °.

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