RU203300U1 - FACIAL INTRAOCULAR LENS FOR PATIENTS WITH MYOPIA - Google Patents

Abstract

The utility model relates to medicine, in particular to ophthalmology, namely to a phakic intraocular lens intended for patients with myopia. radially located around the optical part at an equal distance from each other and made in the form of a trapezoid with rounded sides, with the larger base of the trapezoid adjacent to the optical part of the lens. The optical part of the intraocular lens corresponds to a diameter of 6.5-7.0 mm, and the maximum lens size along the haptic is 13.0-14.0 mm, in addition, the corners of the smaller base of the trapezoidal elements of the haptic part are rounded. The technical result is to increase the stability of the phakicum. intraocular lens while ensuring the safety and ease of its installation.

Description

The useful model relates to medicine, in particular to ophthalmology, namely to a phakic intraocular lens intended for patients with myopia.

Known phakic intraocular lens (Phakic intraocular lens for the rear camera: patent No. 108078652, People's Republic of China, application No. CN201710010110; filed. 01/06/2017; publ. 05/29/2018), including the optical part and the haptic part, including four supporting elements. This lens is made of soft, foldable acrylic. The diameter of the optical part is 8 to 10 mm.

Also known is a refractive intraocular lens (Refractive intraocular lens for use, for example, with myopia, including an optical part and a haptic part with tangible elements, while the haptic part is made so that its posterior surface is in contact with the iris during installation: patent No. 2899093, French Republic , application No. FR0651152; filed 03/31/2006; publ. 10/05/2007), including the optical part and the haptic part. This lens is made of polymethyl acrylate. The optic diameter is 5.5 mm.

Also known is an intraocular lens (Intraocular lens: patent No. 2379181, Canada, application No. US36422599; filed. 07/29/1999; publ. 02/08/2001), including an optical part and a haptic part, consisting of two, three or four elements. This lens is made of polymer material. The diameter of the optical part is 4.5-9.0 mm.

Also known is an intraocular contact lens (Intraocular contact lens: patent No. 18913, Russian Federation, application No. RU2001109288; filed 10.04.2001; published 10.08.2001), containing the optical and haptic parts. A hole is made in the center of the optical part, the radii of curvature of the posterior surface of the optical part and the haptic are in the ratio from 0.5 to 0.8, while the haptic part has perforations and consists of at least three supporting elements made in the form of petals, whose lateral surfaces are bounded by second-order curves.

Also known is an intraocular phakic lens (Phakic lens of the anterior chamber: patent No. 6395028, United States of America, US90837801; filed. 07/18/2001; publ. 05/28/2002), including an optical part and a haptic part, consisting of solid plates with an internal hole. This lens is made of polymethyl acrylate. The diameter of the optical part is 4.5-6.5 mm.

Also known is a refractive intraocular lens of the anterior chamber (Intraocular lens: patent No. 6398809, United States of America, application No. US54813700; app. 12.04.2000; publ. 04.06.2002), including an optical part and a haptic part made of at least two ( preferably four) elements. This lens is made of polymethyl acrylate. The diameter of the optical part is 4.5-9.0 mm.

Also known is a phakic intraocular lens (Film frame for a phakic intraocular lens: patent No. 6425917, United States of America, application No. US57030100; filed. 05/12/2000; publ. 07/30/2002), made of polymethylacrylate including an optical and a haptic part, consisting of two elements.

The closest to the claimed technical solution is a phakic intraocular lens (Phakic intraocular lens: patent No. 124146, Russian Federation, application No. RU2011142222; application. 10/19/2011; publ. 01/20/2013). Phakic intraocular lens, including optical and haptic parts. The surface of the haptic part of the lens contains markings in the form of grooves or notches, which make it possible to visually and tactilely distinguish the front and rear surfaces of the lens. In this case, the optical part of the lens corresponds to the dimensions of 5.0-6.0 mm, and the total size of the lens is 11.0-12.5 mm in diameter. In addition, a hole is made in the middle of the optical part. This technical solution was chosen as a prototype.

The disadvantage of the above analogs and the prototype is the relatively low stability of the position of the lens in the eye (especially in myopia) due to the small size of the haptic part of the lens. This can lead to displacement of the lens relative to its original location and / or dislocation of the haptic part of the IOL into the anterior chamber of the eye, which completely disrupts lens refraction and leads to the need for repeated surgical intervention. In addition, with all the positive aspects of the prototype lens (high efficiency for refraction correction and ease of installation relative to other analogs), the angles of the elements, as well as the notches of the haptic part, are sharp enough, which can lead to unwanted injuries to the eye tissues during implantation.

The problem lies in the need to develop a phakic intraocular lens for patients with myopia, devoid of the above disadvantages.

The technical result consists in increasing the stability of the phakic intraocular lens while ensuring the safety and convenience of its installation.

The technical result is achieved by the fact that in a phakic intraocular lens for patients with myopia, including an optical part with a hole made in the middle and a haptic part, including three identical elements, radially located around the optical part at an equal distance from each other and made in the form of a trapezoid with rounded lateral sides, while the larger base of the trapezium is adjacent to the optical part of the lens, according to the utility model, the optical part of the intraocular lens corresponds to a diameter of 6.5-7.0 mm, and the maximum lens size along the haptic is 13.0-14.0 mm, except In addition, the corners of the smaller base of the trapezoidal elements of the haptic part are rounded.

The implementation of the optical part of the intraocular lens, corresponding to a diameter of 6.5-7.0 mm, allows the lens to be used for patients with myopia. At the same time, the above dimensions were determined experimentally and taking into account other above design aspects, such as the shape of the elements of the haptic part and the presence of an opening made in the middle of the lens to prevent suction to the anterior surface of the lens.

Making the corners of the smaller base of the trapezoidal elements of the haptic part rounded excludes unnecessary trauma to the tissues during the installation of the lens and does not affect the stability of the lens.

The claimed device is illustrated by drawings, where figures 1 and 2 show two versions of the lens with different sizes corresponding to the boundaries of the claimed ranges of the diameter of the optical part and the overall size of the lens.

A phakic intraocular lens for patients with myopia includes an optical part 1 with a hole 2 made in the middle and a haptic part 3. The haptic part 3 includes three elements identical to each other, radially located around the optical part 1 at an equal distance from each other and made in the form of a trapezoid with rounded lateral sides. In addition, the corners of the smaller base of the trapezoidal elements of the haptic part are rounded. In this case, the larger base of the trapezoid is adjacent to the optical part 1 of the lens, as well as the edges of the base of the trapezoidal elements of the haptic part 3 are connected to the optical part 1, because of which the entire lens is a monolithic structure. The optical part of the intraocular lens corresponds to a diameter of 6.5-7.0 mm, and the total lens size is 13.0-14.0 mm. The lens is made of polymer material, preferably collagen (also available in acrylic). For the convenience of installing the lens, as a rule, a text indicator 4 is applied to one of the elements of the haptic part 1, made in a contrasting color with respect to the transparent haptic part 3 (for example, in black).

For the purposes of this application, the overall size of the lens is the diameter of the circle into which the lens fits, with the edges of the haptic part touching a closed plane curve that forms the said circle.

The claimed utility model is illustrated by examples.

Example 1.

Experimental studies were carried out on the stability of the phakic intraocular lens on the cadaver eye of an animal (pig).

For this, a sample of a phakic intraocular lens was made according to the utility model (Sample 1) with the following characteristics:

- the diameter of the optical part - 6.5;

- total lens size - 13.0.

A phakic intraocular lens sample was also used according to the prototype (Sample 2).

The fabricated lens samples were implanted according to the standard technique without suturing into the animal's cadaver eyes. Each cadaver eye was mounted on a special silicone stand (according to patent RU189170). Then, at 10 minutes, the silicone stand was subjected to mechanical stress by performing rapid reciprocating movements, creating conditions for the lens to move relative to its original position. Then, the position of each sample was assessed after 10 minutes of testing.

As a result, it was revealed that Sample 1 retained its original position, and Sample 2 was displaced.

Example 2.

Experimental studies were carried out on the stability of the phakic intraocular lens on the cadaver eye of an animal (pig).

For this, a sample of a phakic intraocular lens was made according to the utility model (Sample 1) with the following characteristics:

- the diameter of the optical part - 7.0;

- total lens size - 14.0.

And also a sample of a phakic intraocular lens according to the prototype (Sample 2). The scheme and test conditions corresponded to example 1.

As a result, it was revealed that Sample 1 retained its original position, and Sample 2 was displaced.

Thus, the claimed utility model provides an increase in the stability of the phakic intraocular lens while ensuring the safety and convenience of its installation.

Claims (1)

A phakic intraocular lens for patients with myopia, including an optical part with a hole made in the middle, and a haptic part, including three identical elements, radially located around the optical part at an equal distance from each other and made in the form of a trapezoid with rounded sides, while the larger base of the trapezium is adjacent to the optical part of the lens, characterized in that the optical part of the intraocular lens corresponds to a diameter of 6.5-7.0 mm, and the maximum lens size along the haptic is 13.0-14.0 mm, in addition, the angles of the smaller base trapezoidal elements of the haptic part are made rounded.

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