RU2550002C2 - Intraocular lens - Google Patents

Abstract

FIELD: medicine.

SUBSTANCE: invention refers to ophthalmosurgery. An intraocular lens comprises an optical part consisting of two lenses with two securing flanges, and a haptic part with grooves. Each flange of the optical part represents a segment of a flat curvilinear figure, while curvilinear elements of the haptic part represent parabolic segments with a focal parameter of 5.0-12.0. Light refraction coefficients of each lens are different.

EFFECT: using the given invention enables reducing ocular tissue injuries, reducing chromatic aberrations, provides more reliable lens fastening in the IOL structure with the graduated intraocular variation of the optical force, and increases conservation.

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Description

The invention relates to the field of ophthalmic surgery.

Known artificial lens of the eye (IHG) according to the patent of the Russian Federation No. 2465865. In the artificial lens of the eye, containing the optical part, consisting of two lenses with fixing protrusions, and the haptic part, containing grooves, each protrusion of the optical part is made in the form of a segment of a flat curved figure, and the curved elements of the haptic part are made in the form of segments of ellipses with eccentricity 0, 04-0.08 and focal parameter 6.0-11.0, and the refractive indices of light of each of the lenses are different.

However, this device has significant disadvantages: insufficient compensation for chromatic aberration of the optical part, trauma to the posterior tissues of the eye by supporting elements due to incomplete coincidence of their shape with the shape of the inner surface of the capsule.

In addition, the fastening of the optical and haptic parts is not reliable enough.

EFFECT: reduction of traumatization of eye tissues, reduction of chromatic aberrations, increase of lens mount reliability in IHG design with a metered intraocular change in optical power, increase of organ-preservation.

The technical result is achieved by the fact that in the artificial lens of the eye containing the optical part, consisting of two lenses with locking protrusions, and the haptic part containing grooves, according to the invention, each protrusion of the optical part is made in the form of a segment of a flat curved figure, and the curved elements of the haptic part are made in the form of parabolic segments with a focal parameter of 5.0-12.0, while the refractive indices of the light of each lens are different.

The proposed set of essential distinguishing parameters is necessary and sufficient for the unambiguous achievement of a technical result.

By focal parameter is meant half the length of the chord passing through the focus and perpendicular to the major axis of the parabola.

The focal parameter can be reduced to 5.0, while remaining within the physiological range of capsule size.

The focal parameter can be expanded to 12.0, since there is a capsule with a diameter of 12.0 mm. With a focal parameter in an unstressed state of 12.0 mm, implantation into a capsule of a smaller diameter provides a more stable intracapsular position.

The invention is illustrated by drawings: FIG. 1-4.

FIG. 1 is a fragment of the attachment of two optical lenses with a haptic part.

FIG. 2 is a view of an optical lens.

FIG. 3 - view of the grooves of the haptic part.

FIG. 4 is a top view of the IHG when mounted in the haptic part.

The artificial lens of the eye contains haptic 1 and optical parts (Fig. 1). The optical part consists of two 2, 3 lenses arranged in series on one common optical axis 4.

IHG is made with the possibility of dosed intraocular changes in optical power in accordance with changes in refraction.

IHG is made with the possibility of reciprocating movement of these lenses 2, 3 along axis 4. In FIG. 2 shows a view of an optical lens. Moreover, each optical lens is equipped with two diametrically opposite protrusions 5 (Fig. 2), made in the form of a segment of a flat curved figure. These protrusions interact with at least two grooves 6 in the haptic part (Fig. 3).

The outer surface of the lens 2 contains two through holes 7, which serve as a stop for the rotation of the lens around the center of symmetry using a special tool (not shown).

The curvilinear elements 8 of the haptic part 1 are made in the form of parabola segments (Fig. 4), which allow more reliable fixation of IHG in the capsule bag due to the congruence shape of the inner surface of the capsule bag.

The refractive indices of the light of lenses 2, 3 are different, which allows to reduce the chromatic aberration. For example, if the refractive indices differ by 6% (1.52 and 1.43), the correction of transverse chromatic aberrations for the blue and red rays of the visible range is 10% of the total volume.

The haptic part 1 is connected to at least two symmetric curved open elements 8 directed in opposite directions.

Intraocular correction of optical power is carried out by moving the intraocular optical lens 3 along the optical axis 4 (Fig. 1).

If necessary, a system of two optical lenses 2, 3 and their intraocular movement along the optical axis 4 are used.

Dosed intraocular correction of optical power is as follows. For intraocular correction of myopia, either optical lens 2 is moved deeper, or when myopia is corrected, lens 3 is removed to a greater extent if it was implanted, either it is replaced by a lens of lower optical power, or lens 3 of the corresponding positive or negative optical power is implanted.

For intraocular correction of hyperopia, either lens 2 is moved toward the cornea if there is no lens 3, or lens 3 is added with the corresponding positive optical power, or it is replaced with a lens with higher optical power.

The proposed IHG works as follows. Moving the optical lenses 2 and / or 3 from / to the cornea reduces / increases the optical power of the IHG. Adding a positive / negative lens 3 increases / decreases the optical power of the ICH. Replacing the lens 2 and / or 3 with a larger / smaller value of the optical power increases / decreases the optical power of the ICH. The magnitude of the displacement and the optical power of the lenses are calculated according to the mathematical dependence on the basis of the magnitude of the required dosed intraocular correction.

The optical power of the replaced optical part is calculated according to the mathematical dependence on the basis of the magnitude of the required dosed intraocular correction.

Implantation of IHG is as follows. After phacoemulsification, the anterior chamber and capsule bag are filled with viscoelastic. Through the tunnel section using the injector or in the folded state, the haptic part of the IHG is introduced through the front chamber into the capsule bag. Then, also using the injector or in the folded state, the optical part of the IHG is introduced into the front chamber and fixed in the capsule bag. Assembly of IHG is performed intraocularly. The anterior chamber is washed with a BSS solution, Acetylcholine 0.01% solution is introduced. The operational access is sealed by hydration.

Using IHG allows you to achieve the claimed technical result - reducing trauma to the tissues of the eye, reducing chromatic aberrations, increasing the reliability of lens mounting in the design of IHG with a dosed intraocular change in optical power.

Claims (1)

An artificial eye lens containing an optical part consisting of two lenses with fixing protrusions and a haptic part containing grooves, characterized in that each protrusion of the optical part is made in the form of a segment of a flat curved figure, and the curved elements of the haptic part are made in the form of parabola segments with a focal parameter 5.0-12.0, while the refractive indices of light of each of the lenses are different.

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