RU2253411C2 - Intracapsular ring having member for fixing intraocular lens - Google Patents

Abstract

FIELD: medical engineering.

SUBSTANCE: device has at least two members for fixing flexible intraocular lens, the members being manufactured as complex shape bends placed in opposite segments and forming loops having at least two coils separated with space between them and being in size close to flexible intraocular lens haptic means thickness allowing to fix flat haptic means in the space between the coils of flexible ring loops and secure stable postoperative lens position.

EFFECT: enhanced effectiveness in performing extracapsular cataract extraction and intraocular aphakia correction.

3 cl, 3 dwg

Description

The invention relates to medicine, namely to ophthalmology, and can be used for extracapsular cataract extraction with intraocular correction of aphakia with an elastic lens (ElIOL) with simultaneous implantation of an intracapsular stabilizing ring (VSC).

Known intracapsular ring with an element of fixation of the intraocular lens, made in the form of bends of the ring, forming a loop [EP 1155665 A3 (publ. 21.11.2001)]. The disadvantage of this ring is the lack of the possibility of stable fixation with its help ElIOL with a plane haptic because of the possible discrepancy between the sizes of the ring and the lens.

The aim of the invention is to expand the capabilities of VSC in fixing ElIOL with a plane haptic and to prevent complications associated with deflection of the lens during fibrosis of the capsular lens bag (CMX), as well as decentration in case of mismatch in the size of CMX and the lens and violation of its position during laser capsulotomy.

This goal is achieved by the fact that during the implantation of ElIOL with a planar haptic, a VSC is initially implanted, having elements in the opposite segments of the ring for fixing the haptic parts of the lens in the form of its bends, forming loops of at least two turns with gaps between them having a size close to thickness haptic element of an intraocular lens. Intracapsular implantation of ElIOL is carried out, the planar haptic parts of which are alternately placed in the elements for their fixation in the ring, leading them into the gap existing between the elastic loops, where they are fixed by clamping due to the elasticity of the VSK and ElIOL materials and a slight difference in the size of the loop gap.

Figure 1 shows the device of the ring - a General view of the fixed in it ElIOL with a plane haptic; figure 2 is the same side view. The device consists of a ring (1) with fixing elements (2) formed by turns (3) with a gap between them (4).

The presence of a flexible VSK on the inner side of the ring has at least two elements for fixing the EIOL in the form of its bends located in opposite segments and forming loops of at least two turns with gaps between them having dimensions equal to or slightly less than the thickness of the lens haptic, allows you to fix planar haptic parts of ElIOL by placing them in the gap between the spring-loaded loops of loops, which, when a planar haptic is inserted into them, slightly apart crumple it between the turns by the type of paperclip, and ensure a guaranteed stable postoperative position of ElIOL.

There is a causal relationship between the VSK design and the technical result, since the KMX stabilizing ring takes the burden on the intracapsular implants arising from KMX fibrosis, reducing or eliminating the flexion of the ElIOL haptic, and the presence of additional lens-fixing elements ensures its centering and stable position in the absence and damage to the posterior leaf of the capsular bag of the lens.

Elements of the ring for fixing ElIOL in the form of its bends, forming loops, can have a different configuration. Figure 1 and 2 presents the locking elements of the ring (2) in the form of a part (segment) of the spiral of various technical solutions. These configurations at the same time are movable joints of the type of hinge, the advantage of which is additional convenience during implantation of VSC, as it allows you to change the shape of the ring by reducing its diameter and facilitate its entry into the arches of the KMX.

To ensure a technical result in fixing the ElIOL haptics between the turns of elastic loops of the ring, there should be at least two of them, but there may be more. Figure 3 presents the locking element of the ring of three turns (3) and two gaps (4). In this case, an additional advantage appears, namely, the possibility of choosing the position of the lens haptic (6) and ElIOL as a whole and, therefore, influencing the postoperative clinical refraction of the eye. Given the knowledge of the step sizes of the turns of the fixing elements and their position, the optical power of the lens can be accurately taken into account, and clinical refraction can be dosed both during the main intervention and in the postoperative period if it is necessary to change it by fixing the haptic in another gap, which also contributes to the high inertness of the materials, the design of ElIOL with a plane haptic and the absence of adhesions fixing it in the intercapsular space.

In addition, if there are two or more turns with gaps in the fixation elements, the latter, by bending the rings, can be located either in the plane of the VSC itself or parallel to it (Fig. 2), or be at an acute angle to it to increase the deflection of the planar lens haptic inside eyes and enhancing its contact with the posterior leaf of CMX in order to somewhat replenish the preoperative volume of the lens, which is the prevention of vitreoretinal complications and opacities of the posterior lens capsule. In the case of a shift or deviation of the fixation elements of the VSK from its plane, they are on one side of the plane of the ring (figure 2).

The size of the loops - VSC fixation elements - is determined by their shape, the dimensions of the CMX, as well as the optical and haptic parts of ElIOL and can range from 0.5 to 2.5 mm. The dimensions of the turns in the loops of the fixing elements can be the same or different.

Figure 3 presents the locking element of the ring with different sizes of turns of loops (3). In this case, one of the turns plays the role of a guide for the planar haptic of ElIOL into the gap fixing it, and the height of the turns up to 2.5 mm allows you to visually control the introduction of the haptic into the gap even with mydriasis less than 6.0 mm.

The size of the gap, as mentioned above, is close in size to the thickness of the haptic part of ElIOL and can be both equal throughout and gradually narrow to the borders of the ring at an acute angle to facilitate the insertion of the lens’s gap and increase the reliability of its fixation. In this case, at the top of the turns, it can slightly exceed the thickness of the lens haptic thickness, and at the outer border of the ring it can be slightly less than its thickness.

The use of the intracapsular ring is as follows. After removal of the nucleus and lens masses during extracapsular cataract extraction, VSK and ElIOL (5) are successively implanted into the capsular bag, the planar haptic parts (6) of which are alternately placed in the elements for their fixation (2) located in opposite segments of the ring by introducing them into the gap (4) between the turns of the elements (3), for which use well-known microsurgical instruments. Center the artificial lens and seal the anterior chamber of the eye. Figure 1, 2 schematically shows the position of ElIOL with a planar haptic located in the elements for its fixation of VSC.

The use of this VSK expands the possibilities of its joint use with ElIOL with planar haptic by expanding the boundaries of the successful use of this type of lens in cases of incompatibility of the KMX and ElIOL sizes, reduces the likelihood of a violation of its position and refractive error of the lens, while ensuring uniform stretching of the CMX and reducing the development of secondary cataracts.

Claims (3)

1. An intracapsular elastic ring containing an element for fixing an intraocular lens made in the form of bends of a ring forming a loop, characterized in that it has at least two fixing elements located in opposite segments of the ring in the form of loops of at least two turns with gaps between them, in size close to the thickness of the haptic element of the intraocular lens, and configured to clamp the haptic element between the turns of the loop of the ring. 2. The intra-capsule ring according to claim 1, characterized in that the locking elements are parallel or at an acute angle to the plane of the ring by shifting or tilting to one side. 3. The intra-capsule ring according to claims 1 and 2, characterized in that the turns of the loops of the fixing elements have different sizes.

Images