UA68731A - Artificial lens - Google Patents

Abstract

The artificial lens contains the lens itself and the peripheral haptic elements. The lens is disposed in the chamber filled with the liquid or other fluid substance. The anterior wall of the chamber is made from the transparent elastic film, while the posterior one represents the ring-shaped elastic film surrounding the lens. Each haptic element consists of external and internal parts connected below the sidewall of the chamber or directly on its surface. The junction point of the haptic element represents the point of its rotation within the plane of the transverse section of the lens.

Description

Description of the invention

The invention relates to medicine, in particular to ophthalmology, and can be used for surgical 2 treatment of eye cataracts or in other cases to restore vision.

Every year, more than 5 million cataract extractions with the implantation of an artificial lens are performed in the world. Eyes with existing models of intraocular lenses (IL) have constant optical power and are therefore adapted for clear vision, for further or near (11.

To eliminate these shortcomings, artificial lenses with bifocal and multifocal lenses were developed, 70 of which concentrically alternate zones for near and far vision |2, ZI.

But these lenses do not always provide patients with normal bifocal vision. Solution |C) has two back foci, due to which the images of distant and near objects formed on the retina and in the medium of the internal fluid do not coincide. A well-known lens made for the same purpose |4| has two plano-convex lenses, located next to each other with flat surfaces and connected by jumpers. The design of the lens is relatively complex and not reliable enough.

The closest to the proposed one, simplified and at the same time more modern, is the artificial lens |bI, which we have adopted as a prototype.

It contains an optical part, or an artificially created lens, which is covered with a transparent film, and haptic elements located diametrically relative to the lens.

The film performs the functions of leveling the surface of the lens and allows to reduce traumatism of the eye tissue during surgery.

Suppose the eye with this IOL has an erytropic refraction. When an object appears in front of the eye at a close distance, a reflex occurs on the ciliary body, the tension of which causes an increase in intraocular pressure in the cavity of the vitreous body. The pressure of the vitreous body on the posterior capsule of the capsular bag causes the capsular bag to shift forward along with the IOL. This shift in the range of 0.25-0.75mm becomes the basis of "increasing the optical power of the eye as a whole, which in turn creates an accommodation effect of 0.5-1.5D." But such accommodation capacity is far from sufficient for normal working capacity.

The main task of the invention is to create a lens with a greater accommodation capacity, that is, one that would provide a higher quality of vision in the distance and near without spectacle correction and the maximum approximation to the natural mobility of the eye. co

The solution to the given problem is achieved by the fact that in the artificial lens containing the lens and peripherally located haptic elements, according to the invention, the front part of the lens is located in a chamber with a liquid - or another substance with fluid properties, the front wall of which is made of a transparent elastic film, with the back - in the form of a ring-shaped elastic film located around the perimeter of the lens, and each of the haptic elements is made of external and internal parts, the connection point of which is located under the ring-shaped ee, the side wall of the camera, or on it and is the turning point of the haptic element in the plane cross-section of the lens, and the refractive index of the liquid is at least 1.336.

The technical result achieved by the invention is the approximation of the IOL design to the anatomical structure of the living lens. With 50 Fig. 1 and Fig. 2 show an artificial lens in cross-section for its two positions, respectively for distance and near vision, on which it is indicated:

From" 1. chamber with liquid; 2. lens;

C. front wall of the chamber; 4. back wall of the camera; b 5. external (peripheral) part of the haptic element;

Ge | 6. the turning point of the haptic element relative to the side wall of the camera; 7. the inner part of the haptic element, which is in contact with the lens; 7 8. points in which the inner part of the haptic element contacts the lens; so 20 9. capsular bag.

The proposed lens performs its functions as follows: and In the case of distance vision, it occupies the position in the capsular bag indicated in Fig.1. In the event of an accommodation reflex, the intraocular pressure shifts the capsular bag 9 to the front. The equator of the capsular bag, being fixed to the ciliary body, remains in the same position. The maximum shift occurs in the middle of the implant, that is, on the optical part of the IOL (Fig. 2). At the same time, the peripheral edge of the outer part, c. the haptic element being fixed along the equator of the capsular bag also remains in place. The inner part of the haptic element 7 presses on the lens 2 and changes the shape of the front wall Z of the camera 1. It becomes convex, which increases the refractive power of the IL. By programming the convexity of the front surface of the lens 2, it is possible to obtain any desired optical power of the IOL at the accommodation voltage. 60 The increase in the optical power of the eye as a whole occurs due to two factors - as a result of the change in the shape of the front wall of camera 1 and due to some shift of the lens 2 to the front.

The proposed mechanism of increasing the optical power of the IOL is very close to the natural mechanism of accommodation.

Literature because 1. A.s. USSR Mo1116572, class Ab1E1/16, publ. 1982

2. US patent Mo5112351, cl. AE1E1/16, 453-32, 1992 3. US patent, Mo4635211, cl. AE1E1/16, 452-32, 1987 4. Patent of the Russian Federation Mo2134086 SI, cl. АЕ1ТЕ1/16, publ. 1999, Bull. Mo22; 5. Patent of Ukraine Mo34462, Ab1E1/16, publ. 2001, Bull. Mo2. x 1 iy 6 de

BO b o

Fig. 1 5 EE NI

A "Z 5 b 8 9

Fig. 2

Claims (1)

The formula of the invention 1. An artificial lens containing a lens and peripherally located haptic elements, which differs in that the front part of the lens is placed in a chamber with a liquid or another substance with fluid properties, the front wall of which is made of a transparent elastic film, the back wall is in the form of a ring " of an elastic film located around the perimeter of the lens, and each of the haptic elements is made of external and internal parts, the connection point of which is located under the side wall of the camera or on it, and is the turning point of the haptic element in the cross-sectional plane of the lens. 2. An artificial lens according to claim 1, which differs in that the refractive index of the liquid is at least 1.336. and in , , , sho. - Official bulletin "Industrial Property". Book 1 "Inventions, useful models, topographies of integrated microcircuits", 2004, M 8, 15.08.2004. State Department of Intellectual Property of the Ministry of Education and Science of Ukraine. so shi s ;" (22) (ee) -I o 50 - 60 b5