RU94144U1 - DEVICE FOR ULTRASONIC BIOMICROSCOPY OF AN ISOLATED EYE APPLE - Google Patents

Abstract

 1. A device for conducting ultrasound biomicroscopic examination of the eye, including a bath, characterized in that at the bottom of the bath there is an emphasis for the eyeball, and the device is additionally equipped with an element for fixing the eyeball on the emphasis. ! 2. The device according to claim 1, characterized in that the emphasis for the eyeball is made in the form of a truncated cone, fixed on the bottom of the bath with a smaller base. ! 3. The device according to claim 1 or 2, characterized in that the element for fixing the eyeball on the stop is made in the form of a ring with a handle.

Description

The utility model relates to ophthalmology and can be used in ultrasound biomicroscopy (UBM) of an isolated eyeball to determine the anatomical and topographic relationships and morphometric parameters of the structures of the anterior segment and peripheral structures, for example, in pathological conditions of the human eyeball or experimental animal.

When performing UBM studies of the human eyeball, an immersion medium is used, which conducts ultrasound from the sensor to the studied eye structures.

It is known to use a special ring to create the volume of immersion fluid, the lower part of which is located in the arches of the conjunctival cavity, and the upper part serves as a limiting barrier to the immersion fluid, which is used as physiological saline (CWPovlin, FSFoster. Ultrasound Biomocroscopy in glaucoma. In: The Glaucomas. Edited by R. Ritch, MBShields, T. Krupin, 2-nd ed. Mosby, 1996. Vol. I. p. 476; C. Tello, S. Potash, J. Liebmann, R. Ritch. Ophthalmic surgery Soft contact lens modification of the ocular cup for high-resolution ultrasound biomicroscopy. 1993. Aug. Vol. 24.No 8. p.563-564).

The disadvantage of this ring device is the inability to conduct UBM studies of an isolated eyeball, because the isolated eyeball does not have arches of the conjunctival cavity, at the same time, the isolated eyeball must be in a humid environment to prevent it from drying out during the study.

It is known to use blepharostat to create and hold a volume of immersion fluid (RF Patent No. 2251978, АВВ 8/10, 12/27/2004), which, when the eyelids are diluted and then lifted, create a volume from the natural anatomical structures of the eye.

This device is also not suitable for conducting UBM studies of an isolated eyeball, because An isolated eyeball does not have the natural anatomical structures of the eye.

The prototype of the claimed technical solution is a device made in the form of a bath (RF Patent No. 83182, A61F 9/00, 05/27/2009), which is also placed in the conjunctival cavity. The tray has the shape of two truncated cones with a height of 10 mm and 3 mm, touching smaller bases with diameters of 20 mm and having large bases of 60 mm (upper truncated cone) and 25 mm (lower truncated cone), and in the contact plane there is an opening with a diameter of 18 mm . To conduct UBM for the patient's eyelids, the lower part of the bath is inserted into the conjunctival cavity. The upper part of the bath is filled in 2/3 with physiological saline, the tip of the sensor is lowered into the solution and the study is carried out. The large diameter of the upper part of the bath does not prevent the sensor from moving sideways and, therefore, provides a wide overview of the structures under study.

The disadvantage of this device is the bath is the inability to conduct UBM studies of an isolated eyeball, because the isolated eyeball does not have a conjunctival cavity, while the isolated eyeball must be in a humid environment to prevent it from drying out during the study.

The problem to be solved and the expected technical result are to create a device suitable for conducting UBM studies of an isolated eyeball without drying out during the study, while maintaining a broad overview of the structures under study.

The problem is solved in that the device for conducting ultrasound biomicroscopic examination of the eye, including the bath, is characterized in that an emphasis for the eyeball is installed at the bottom of the bath, and the device is additionally equipped with an element for fixing the eyeball on the emphasis. The emphasis for the eyeball is made in the form of a truncated cone, fixed on the bottom of the bath with a smaller base. The element for fixing the eyeball on the stop is made in the form of a ring with a handle.

The tray, therefore, unlike the prototype, has a bottom, and the element for fixing the eyeball prevents it from floating in the immersion medium and ensures the fixation of the eyeball in any position relative to the sensor.

The device is used to conduct UBM studies through the immersion medium of the anterior segment and peripheral structures of an isolated human eyeball or experimental animal. As a result of studies, the anatomical and topographic relationships and morphometric parameters of these structures are determined. A wide view of the studied structures is provided by the possibility of fixing the eyeball in any position relative to the sensor. Drying of the studied eyeball during research is excluded.

The proposed device and the studied eyeball are schematically depicted in figure 1. Here:

1 - bath

2 - an emphasis for an eyeball

3 - element for fixing the eyeball on the stop

4 - the equator of the eyeball

5 - limb

6 - cornea

7 - immersion medium

8 - ultrasonic sensor.

The emphasis 2 for the eyeball is made, for example, in the form of a truncated cone fixed on the bottom of the bath 1 with a smaller base.

Element 3 for fixing the eyeball on the stop is made, for example, in the form of a ring with a handle; can be performed at the same time with the bath 1.

In the experiment we used a plastic bath 1 with a height of 35 mm and a diameter of 65 mm. The wall thickness is 1 mm. At the bottom of the bath 1 in the center there is a fixed stop 2 for the eyeball in the form of a hollow truncated cone 10 mm high. The outer diameters of the cone are 28 and 20 mm, and the inner, respectively, 19 and 14 mm. The emphasis 2 is fixed to the bottom of the bath 1 with a smaller base.

Element 3 for fixing the eyeball on the stop 2 helps to correctly position and hold the eyeball in an immersion medium, without interfering with the movement of the sensor to increase the latitude of the studied structures. As element 3, for example, a fixing ring with a handle is used. The diameter of the ring corresponds to the inner diameter of the stop and is 19 mm. The length of the handle is 65 mm. The handle moves away from the locking ring at an angle of 150 °. At 10 mm from the ring, the handle has a bend at an angle of 160 °. For ease of manipulation, the handle has a cylinder with notches with a diameter of 5 mm and a height of 20 mm, which is 10 mm from the end of the handle. The locking ring and the handle are made of wire with a diameter of 1 mm.

To change the position of the eyeball on the stop 2 and to remove the studied area in the field of operation of the ultrasonic sensor 8, a tool developed by the authors can be used - a manipulation tweezer, similar to a surgical one, with jaws bent at the ends at a right angle. The length of the tweezers is 100 mm, the length of the teeth is 0.6 mm.

A rabbit was taken as a laboratory animal on which various eye pathology was simulated.

The proposed device is used as follows.

In the bath 1, place the isolated eyeball with the back pole down and fix it in the stop 2. On top, without exerting pressure, fixation ring 3 is installed so that it contacts the eyeball between the limb 5 and the equator 4 and, thus, the obstruction is prevented the sensor to the sides (the movement of the sensor to the sides is shown by arrows in figure 1) to increase the overview of the structures under study.

Then the volume of the bath 1 is filled with immersion liquid 7 so that the liquid level in the bath 1 is 4-5 mm higher than the study area. An ultrasound probe 8 (mounted, for example, on a tripod) is immersed in immersion fluid 7, without touching the cornea 6, hold it perpendicular to the structures under investigation and conduct UBM examination through immersion medium 7.

Grasping the eyeball, for example, with manipulation tweezers, by the sclera, the eyeball is rotated (positioned) so that the projection of the structures under investigation is perpendicular to the ultrasound transducer 8. As a result, optimal conditions are created for conducting UBM research, with a broad overview of the structures under study and without drying out the isolated eyeball during the research process.

According to the results of a UBM study using the inventive device on an isolated rabbit eyeball, the following were diagnosed: the formation of anterior and posterior goniosynechia, a change in the anterior chamber depth and corneal thickness, and atrophic changes in the iris and anterior chamber angle were detected.

Claims (3)

1. A device for conducting ultrasound biomicroscopic examination of the eye, including a bath, characterized in that at the bottom of the bath there is an emphasis for the eyeball, and the device is additionally equipped with an element for fixing the eyeball on the emphasis. 2. The device according to claim 1, characterized in that the emphasis for the eyeball is made in the form of a truncated cone, fixed on the bottom of the bath with a smaller base. 3. The device according to claim 1 or 2, characterized in that the element for fixing the eyeball on the stop is made in the form of a ring with a handle.