RU176305U1 - GOGGLES FOR VIDEONISTAGMOSCOPY - Google Patents

Abstract

The utility model relates to medical equipment and can be used when performing video nystagmoscopy and positional maneuvers. The technical result is the expansion of the field of view of the patient's eyes; examination of the patient by several specialists without distortion of the image of the patient’s eyes during side examination; simplification of the design of the glasses, reducing their weight, improving convenience when using them, reducing their cost, eliminating the risk of their breakage when dropped. This is achieved by the fact that the body is made of leather on a dense fabric base. Plastic prismatic Fresnel lenses of 20 prismatic diopters are inserted into the case in an aluminum frame, the focal length is 6 mm in the form of semi-ovals, the rounded sides of which are facing the medial corners of the eyes of the patient. The length of the small axes of the Fresnel lenses is 43 mm, and the large axes are 50 mm. Transparent plastic in the form of semi-ovals is inserted into the side surfaces of the housing in an aluminum frame, the lengths of the small axes of which are equal to the lengths of the small axes of the plastic Fresnel prismatic lenses.

Description

The utility model relates to the field of medicine, namely to medical equipment and can be used when performing video nystagmoscopy and also when performing positional maneuvers and when registering a nystagmine reaction from both eyes.

At the moment, the presence of glasses for diagnosing nystagmus in the outpatient department of an ENT doctor is legally prescribed.

When performing video nystagmography, a helmet-mask is used with a unit integrated into the eyepiece frame, inside which an infrared video camera operating from the electric network is placed, that is, the helmet-mask is intended for only one eye. In addition to the helmet mask, an obturator is attached, with which it is possible to close the slot for the other eye [Operating Instructions for VNG ULMER, Manufacturer: Synapsys, France].

A helmet mask for video nystagmography is also known. This is achieved by the fact that two remote radio-wave chambers are installed in the eyepiece frame, and the helmet mask is additionally equipped with a temporal temporal latch, consisting of a headband and two protective ear linings attached to it from the inside. A wireless power source is installed on the headband connected to the eyepiece frame with a fastener [RU 136312, 2014].

The above constructions have the following disadvantages: limited mobility, the need for batteries, high cost (the cost of a helmet mask for video nystagmography VNG ULMER, manufacturer: Synapsys, France, is about 500,000 rubles, and a helmet mask for video nystagmography, patent RU 136312 - 50,000 rubles) .

As a prototype for the closest technical nature, we selected Fresnel glasses (Fresnel), proposed by the German doctor Herman Frenzel for video nystagmoscopy. The collecting lenses of the glasses have a large increase (+ 10. + 20 diopters), which excludes the effect of fixing the gaze and fixing spontaneous nystagmus. This allows the doctor to monitor eye movement. The design includes a special backlight directed into the eyes of the subject. The combination of powerful biconvex lenses and bright light actually blinds the patient, he does not fix his gaze on anything, which facilitates observation of eye movements. [Gejrot T. Hermann Frenzel and the lighted eyeglasses. He introduced a new way to measure vertigo // Lakartidningen. 1994 Sep 21; 91 (38): 3395-6. - 1994. - No. Sep 21; 91 (38). - C. 3395-6. Rothermel E.B. Benign paroxysmal positional dizziness // Bulletin of otorhinolaryngology. - 2007. - No. 4. - S. 66-69].

The disadvantages of the prototype include:

• insufficiency of the field of view of the patient’s eyes for the doctor (lens diameter - 35 mm);

• a biconvex Frenzel lens distorts the patient’s eye image during lateral examination, which occurs when examining a patient by several specialists or when examining a patient with interns or residents;

• the need to hold the model with your hand, which complicates the study (see photo of the prototype - Fig. 1 and Fig. 2);

• the need for frequent change of batteries, which requires additional costs for the operation of the device.

• design complexity, the weight of which is about 1 kg;

• high cost of construction (50-60 thousand rubles);

• a high risk of damage to glasses in case of accidental fall, as the device parts are made of breakable materials: a plastic case, breakable Fresnel lenses and a lighting device.

The technical result of the utility model is:

• expanding the field of view of the patient’s eyes for the doctor;

• the ability to examine the patient by several specialists without distorting the image of the patient’s eyes during a side examination;

• simplification of the design of the glasses and reducing their weight, as well as improving the convenience when using them;

• reduction in the cost of points;

• elimination of the risk of breakage of glasses when they fall.

The technical result of the utility model is achieved in that the glasses for video nystagmoscopy consist of a body made of leather on a dense fabric base. Plastic prismatic Fresnel lenses of 20 prismatic diopters are inserted into the case in an aluminum frame. The focal length is 6 mm, made in the form of semi-ovals, the rounded sides of which are facing the medial corners of the patient's eyes. The length of the small axes of the plastic prismatic Fresnel lenses is 43 mm, the length of their major axes is 50 mm. Transparent plastic in the form of semi-ovals is inserted into the side surfaces of the housing in an aluminum frame, the lengths of the small axes of which are equal to the lengths of the small axes of the plastic prismatic Fresnel lenses. Glasses also contain rubber fasteners, equipped with a regulator of its length and connected to the side surface of the body for fixing to the head.

Distinctive essential features and a causal relationship between them and the achieved technical result:

• The case of glasses for video nystagmoscopy is made of leather on a dense fabric base, which ensures softness of the structure and is the key to comfortable adherence of glasses to the face of the subject, allows them to be used in patients with different head circumferences, and also provides the ability to fold the structure and put it in your doctor’s pocket , which makes this design compact, convenient and practical.

• 20 prismatic Fresnel prismatic lenses are inserted into the case in an aluminum frame, 20 prismatic diopters, focal length 6 mm, made in the form of semi-ovals, the rounded sides of which are closer to the inner corners of the patient’s eyes.

Due to the lightness of aluminum, the frame does not burden the structure.

The Fresnel prismatic lens, unlike the biconvex Fresnel lens, is flat, which eliminates the distortion of the image of the patient’s eyes during lateral examination, which occurs when examining the patient by several specialists or when examining the patient with interns or residents.

20 prismatic diopters of prismatic Fresnel lenses are sufficient for the doctor to visualize nystagmus in a patient.

The focal length of Fresnel lenses is 6 mm, which exceeds the distance from the eye to the lenses and creates the effect of a blurred environment, that is, it does not allow fixing to the eye, which eliminates all manifestations of fixative spontaneous nystagmus, and all vestibular manifestations are amplified and can be easily noted by a doctor. The location of the rounded sides of the Fresnel prismatic lenses, made in the form of a semi-oval, closer to the inner corners of the patient’s eyes, eliminates pressure on the nose of the patient during the examination.

• The length of the small axes of Fresnel prismatic lenses made in the form of semi-ovals is 43 mm, the length of their large axes is 50 mm.

The selected sizes of prismatic Fresnel lenses provide a larger, compared with the prototype, the doctor’s review of the patient’s eyes, which simplifies the work of the doctor.

• Transparent plastic in the form of semi-ovals is inserted into the side surfaces of the housing in an aluminum frame so that their non-rounded sides are parallel to the non-rounded sides of the plastic Fresnel prismatic lenses and their lengths are equal.

The semi-oval shape is the maximum possible light zone, which does not interfere with the strength of the structure and ensuring the mobility of its nodes.

Transparent plastic in the frame, inserted into the side surfaces of the housing, provides penetration of external lighting, which, replacing the lighting device available in the prototype, illuminates the patient's eyes.

The non-rounded sides of transparent plastic made in the form of semi-ovals are parallel to the non-rounded sides of the plastic Fresnel prismatic lenses and their lengths are equal, which creates a fold line along the indicated non-rounded sides, which, in turn, is the same as the case of glasses made of leather on a dense fabric base, provides the ability to fold the structure and place it in the pocket of the doctor, which makes this structure compact, convenient and practical, as we noted above.

• The glasses also contain rubber fasteners, equipped with a regulator of its length and connected to the side surface of a dense fabric base for fixing to the head.

Elastic, universally stretched, allows the tissue base to be tightly fixed to the face, which allows the design to be used in patients with different head circumferences.

• The prismatic Fresnel lens, as well as transparent plastic inserts on the side surfaces of the glasses body, in combination with the case made of leather on a dense fabric base, eliminate the risk of glasses breaking when dropped, unlike the prototype.

The cost of manufacturing the structure is 4,500 rubles, which is 12 times cheaper than the design of the prototype.

In FIG. 3 and FIG. 4 presents photographs that depict a utility model, where:

1. housing;

2. rubber fasteners;

3. rubber length adjuster.

4. Freenel lenses in aluminum frame;

5. side surfaces of the housing;

6. transparent plastic in an aluminum frame;

7. non-rounded sides of transparent plastic made in the form of semi-ovals;

8. the rounded sides of the plastic prismatic Fresnel lenses;

The utility model works as follows:

The doctor takes the glasses by the body (1) and puts it on the patient's face so that the body is pressed firmly against the paraorbital part of the face. Rubber fasteners (2) with the help of the length adjuster (3) tightly press the glasses to the face so that the eyes of the subject are in the projection of Fresnel lenses in an aluminum frame (4). The lateral surfaces of the body (5) hold transparent plastic in an aluminum frame (6) in order to naturally illuminate the patient's eyes. The non-rounded sides of transparent plastic made in the form of semi-ovals (7) and the non-rounded sides of plastic Fresnel prismatic lenses (8) are out of the patient's field of view and do not allow fixing the gaze. The doctor evaluates the mobility of the eyes and determines the presence of nystagmus through magnifying Fresnel lenses.

As a dense fabric base, we used linen cloth, but another dense fabric base can be used. We used standard polycarbonate (PC) as transparent plastic, but various types of fiberglass can also be used.

The utility model has been successfully tested at the Department of Otorhinolaryngology, North-West State Medical University. I.I. Mechnikov in 46 patients.

Thus, the developed utility model allows:

• expand the field of view of the patient’s eyes for the doctor;

• examine the patient by several specialists without distorting the image of the patient’s eyes during a side examination;

• simplify the design of glasses, reduce their weight, achieve their compactness and thereby increase the convenience when using glasses;

• reduce the cost of points;

• eliminate the risk of breakage of glasses when they fall.

Claims (1)

Glasses for video nystagmoscopy, consisting of a case made of leather on a dense fabric base, plastic prismatic Fresnel lenses of 20 prismatic diopters in aluminum frame, focal length of 6 mm, made in the form of semi-ovals, the rounded sides of which are facing the inner corners of the patient’s eyes, are inserted into the case , the length of the small axes of the Fresnel lenses is 43 mm, the major axes are 50 mm, transparent plastic in the form of semi-ovals is inserted into the side surfaces of the housing in an aluminum frame so that its non-rounded sides are parallel to the rounded sides of the plastic prismatic Fresnel lenses and their lengths are equal, the glasses also contain rubber fasteners equipped with a regulator of its length and connected to the side surface of the body for fixing to the head.

Images