RU134049U1 - TORIC INTRAOCULAR LENS WITH LABELING OF CYLINDRICAL COMPONENT - Google Patents

Abstract

The device relates to medical equipment and, in particular, to ophthalmology. Before implantation on a toric IOL, 1.5-2.5 mm backward from the optical center of the IOL in the direction of production markings, under an operating microscope, an insulin needle with a diameter of 30 or 27 Gauge, two point marks are punctured in the surface layers, which indicate the position cylindrical meridian IOL. The marking provides a determination of the rotational stability of the toric IOL in the capsule bag in patients with corneal astigmatism in the conditions of a rigid pupil 1 ill.

Description

The device relates to medical equipment and, in particular, to ophthalmology and can be used in cataract surgery with implantation of a toric intraocular lens (IOL) in patients with corneal astigmatism with a rigid pupil.

The search for acceptable options for the simultaneous correction of aphakia and corneal astigmatism led to the creation and implementation in clinical practice of toric IOLs, the use of which avoids the problems encountered during incisions on the cornea, does not require special skills in interventions on the cornea, has a predictable result and stability of the effect, operation conducted according to standard technology; allows simultaneous cataract extraction and correction of preoperative astigmatism, significantly reduces the time of visual and social rehabilitation of the patient. (Malyugin B.E., Filipov V.O. The first experience in correcting corneal astigmatism with phacoemulsification using a spherocylindrical IOL // New in Ophthalmology. - 2001. - No. 1. - P.15-16; Horn JD Status of toric intraocular lenses / / Current Opinion in Ophthalmology. - 2007. - Vol. 18. -P. 58-61).

Toric IOLs are monolithic biconvex spherical acrylate lenses and are distinguished by the toric component present on the back surface. The optical part of the lens is marked with dots or stripes on two opposite sides, which indicate the position of the cylindrical component of the IOL, with which the lens is installed in the capsular bag in accordance with the position of the strong corneal meridian.

The main requirements for implantable toric IOLs are not only the neutralization of corneal astigmatism immediately after surgery, but also the need for a stable position of the IOL in the capsular bag for a long time. Rotational instability of toric IOL models causes a significant decrease in vision in the postoperative period. The most common cause of rotational instability of the IOL is the wrinkling of the capsular bag due to the development of the fibrous process, as a result of which the lens rotates clockwise around its axis. Most of these cases occur during the first three months after implantation (Jos J. Rozema, Gobin L., Verbruggen K., Tassignon MJ, Changes in rotation after implantation of a bag-in-the-lens intraocular lens // Journal of Cataract and Refraction Surgery. - 2009. - Vol. 35 - No. 8. - P.1385-1388; Chang D. Comparative rotational stability of single-piece open-loop acrylic and plate-haptic silicone toric intraocular lenses // Journal of Cataract and Refraction Surgery. - 2008. - Vol. 34. - P.1842-1847).

Even a slight deviation of the cylindrical meridian of the toric IOL from the calculated axis can lead to a significant decrease in astigmatic correction. For example, a deviation of only 10 degrees minimizes the potential correction to 35%, which leads to a significant decrease in the visual acuity of the patient (Jos J. Rozema, Gobin L., Verbruggen K., Tassignon MJ, Changes in rotation after implantation of a bag-in- the-lens intraocular lens // Journal of Cataract and Refraction Surgery. - 2009. - Vol. 35 - P.1385-1388; Weinand F. et al. Rotation stability of a single-piece hydrophobic acrylic intraocular lens: new method for high -precision rotation control // Journal of Cataract and Refraction Surgery. - 2007. - Vol. 33 - No. 5. - P.800-803).

The prototype of the utility model is to determine the correct location of the cylindrical meridian after surgery on the eyes with a rigid pupil using special markings applied to the toric IOL, in the form of two strips on each side of the edge, which indicate the position of the cylindrical meridian of the IOL. The strips end with arcs equal to 1/4 of the ring with a diameter of 3 mm, 1.5 mm on each side of the optical center of the IOL, concave towards the edge of the lens. The marking is applied to the surface of the IOL during its industrial production (Utility Model Patent No. 110978 dated December 12, 2011 (Bull. No. 34) according to application No. 20111110877 dated March 23, 2011 “Toric intraocular lens with a marking for its orientation”. Authors: Fedyashev G.A., Egorov V.V.).

The disadvantages of this markup are:

- it is necessary to change the technology of industrial production of IOLs (i.e., marking during manufacture);

- marking according to the prototype causes the patient visual disturbances - a decrease in contrast sensitivity, visual impairment in low light conditions, the appearance of the effect of "gallo";

- when decentralizing the IOL, in the case of markings falling into the center of the optical zone, the visual acuity of the patient is significantly reduced;

The task is to propose the marking of toric IOLs for accurate orientation in the capsule bag with corneal astigmatism in the conditions of a rigid pupil that does not affect the quality and visual acuity of the patient.

The technical result is the ability to accurately visualize the position and determine the rotational stability of the toric IOL in the capsule bag during and after surgery, in patients with corneal astigmatism in the conditions of the rigid pupil.

The figure shows a toric IOL with the proposed labeling.

Before implantation on a toric IOL 1, with the existing production marking 2, 1.5-2.5 mm from the optical center of the IOL to the sides of the production markings, under an operating microscope, an insulin needle with a diameter of 30 or 27 Gauge, two surface are punctured point marks 3, which indicate the position of the cylindrical meridian of the IOL, both during the operation and in the postoperative period. The distance between the marks is not fixed and is determined by the surgeon, depending on the degree of expansion of the pupil. The choice of distance is calculated so that the marks are located on the edge of the pupil.

Device Advantages:

- labels do not cause visual disturbances in patients (there is no gallo effect, no decrease in contrast sensitivity, and vision in the dark does not decrease);

- in cases of IOL decentration and label displacement, the visual acuity of the patient does not decrease;

The device is simple in execution and does not require changing the industrial production of IOL;

Claims (1)

A toric intraocular lens with a marking of a cylindrical component, indicating the position of the cylindrical meridian of the IOL, characterized in that in the surface layers of the toric IOL, departing depending on the degree of expansion of the pupil 1.5-2.5 mm from the optical center of the IOL to the side of the production markings, under with an operating microscope, an insulin needle with a diameter of 30 or 27 Gauge punctured two point marks.

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