RU114606U1 - RING FOR DETERMINING THE POSITION OF TORIC INTROCOULAR LENSES - Google Patents

Abstract

A device for determining the correct installation of toric intraocular lenses during and after surgery, which is a ring marked in degrees, characterized in that the ring is a segment of a sphere 6 mm wide, with a radius of curvature of 12 mm, and a thickness of 0.3-0.5 mm , inner diameter 11-12 mm, outer diameter 17-18 mm.

Description

The utility model relates to ophthalmology and can be used in patients with irregular corneal shape, namely with astigmatism, during surgical treatment of cataracts with implantation of a toric intraocular lens (IOL).

The most important stage of the operation is the marking, during which marks are applied to the cornea along the calculated axis, with which the cylindrical component of the IOL will then be matched. Even a slight mismatch in the position of the cylindrical component of the toric IOL relative to the calculated axis can lead to a significant reduction 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 closest prototype of the utility model is the marking of the cornea. At the same time, the markup is carried out in two stages. The first stage - marking the horizontal meridian of the cornea - is carried out in the patient's sitting position. Using a marker, the horizontal meridian is marked in the form of two points along the outer and inner edges of the cornea (0 and 180 °).

The second stage - marking the previously calculated axis of the cornea, with which the cylindrical component of the IOL will subsequently be compared - is carried out immediately before the operation, in the supine position, under the microscope. Using a marker made in the form of a metal ring with a graduation in degrees, focusing on the position of the horizontal meridian, mark the axis of the cylindrical component of the IOL (www.bck-m.ru/rayner-iol/iol-tflex.html; Graether JM Simplified system of marking the cornea for a toric intraocular lens // Journal of Cataract & Refractive Surgery. - 2009. - Vol. 35, Issue 9, Pages 1498-1500; Shilova T.Yu., Anisimova S.Yu. Method of intraocular correction of aphakia with astigmatic Acrysof Tone lenses / Collection of scientific articles “Modern Technologies of Cataract and Refractive Surgery - 2009” / FGU MNTK Mik eye surgery. "- M., 2009. - P.232).

The disadvantages of this device are:

- the ring is made of metal and needs sterilization;

- the need for applying labels to the cornea with coloring substances denoting the horizontal meridian, which are often erased during the preparation of the patient for surgery;

- the ring is equipped with a handle, so the scribe is not always placed in the palpebral fissure, for example narrow;

- after the operation, the marking disappears and to check the correct position of the IOL, it is necessary to repeat the entire two-stage marking procedure, which leads to additional trauma to the eyeball, which is held for the first and second time with tweezers, as the patient makes involuntary eye movements;

- the ring is a flat structure not adjacent to the eyeball.

The objective of the utility model is to propose a device for accurately determining the correct position of the toric IOL in the eye.

The technical result is the reduction of trauma to the tissues of the eye due to the retention of the ring on the eyeball due to adhesion.

The figures show: Figure 1 - device for determining the position of a toric IOL (top view).

The device is a closed ring 1, a thickness of 0.3-0.5 mm in the form of a segment of a sphere 6 mm wide, corresponding to the curvature of the sclera, with a radius of curvature 12 mm (Figure 1), the inner diameter of the ring is 11-12 mm, the outer 17- 18 mm The ring is held on the eyeball due to adhesion.

The device is used as follows. Before the operation begins, the ring, in the sitting position of the patient, is placed on the eyeball and the ring is rotated so that the 0 and 180 ° graduation marks 2 of ring 1 correspond to the horizontal meridian of the cornea.

Ring 1 is left on the eye before and during the operation. After removing the cloudy lens, a toric IOL is implanted into the capsule bag through the main operative access and rotated clockwise until the labels on the IOL indicating the position of the cylindrical component coincide with the position of the calculated axis, which is determined by graduation 2 of ring 1. After surgery, the ring is removed.

Advantages of the proposed utility model:

- it is possible to use the device both before the operation, and during and after the operation to determine the position of the IOL in the eye, without marking the cornea in two stages;

- it is possible to use a utility model in the eyes with a narrow palpebral fissure;

- the ring is held on the eyeball due to adhesion;

- there is no need to apply coloring substances to the cornea of the eye;

- there is no likelihood of washing off the marked markings with a tear and solutions;

- reduced trauma to the tissues of the eye, as additional tools are not used for marking and holding the eyeball.

An example of a specific implementation: a ring of polymethylmethacrylate, 0.5 mm thick, in the form of a segment of a sphere 6 mm wide, with a radius of curvature 12 mm, the inner diameter of the ring 11 mm, the outer 17 mm.

Claims (1)

A device for determining the correct installation of toric intraocular lenses during and after surgery, which is a ring with a marking in degrees, characterized in that the ring is a segment of a sphere 6 mm wide, with a radius of curvature 12 mm, a thickness of 0.3-0.5 mm , with an inner diameter of 11-12 mm, an outer diameter of 17-18 mm.