A method of treating false myopia laser device for its implementation

 

The invention relates to ophthalmology, and can be used to treat the false myopia. A method of treating false myopia involves exposure to radiation from a helium-neon laser on the ciliary body. Moreover, irradiation is carried out diascleral circumference Multispeed punctulata scanning radiation. Laser device for the treatment of false myopia contains helium-neon laser, power supply, control power, a deflector control unit, the generator of rectangular pulses, an electronic key, a movable cylinder, prism and the front set. Thus the output of the pulser is connected with the control input of the electronic switch, the output of the power supply is connected to the controlled input of the electronic switch, the output of the electronic switch is connected to the input of helium-neon laser, the output of which is optically connected to the input of the power control, the output of which is optically connected to the input of the deflector, the optical output of which is connected with a movable prism. The invention improves the efficiency of the treatment. 2 N. p. F.-ly, 1 Il.

The invention relates to the field of medical science is levania children which progression leads to the development of high myopia with thinning of the retina and slobovian with a number of complications in the fundus, are not amenable to correction glasses or contact lenses. Deep organic changes in the membranes of the eye, in the retina and choroid are accompanied by weak sight or blindness and make up a high percentage of disability (more than 20). Therefore, one of the main objectives is the prevention and treatment of false myopia (spasm of accommodation), which contributes to the progression of the true myopia. Unfortunately, the low efficiency of the known methods of treatment, caused by not enough studied the etiology and pathogenesis of this disease require multiple re-use in ophthalmic practice, it is often unsatisfying neither a doctor nor patient.

Currently in ophthalmic practice is widely used to treat the false myopia irradiation of the ciliary body radiation of helium-neon laser in the regime of power from 5 to 20 µw duration from 3 to 5 min with a number of seanav from 5 to 10 (A. A. Semenov, F. A. Romashenko and other materials of all-Union conference on pediatric ophthalmology, Riga, 1991, page Vila, positive results in almost half the cases were unstable. So had to resort to repeated courses of treatment, which is a significant drawback of the method and shows a low efficiency of treatment.

Currently, it is well known that irradiation of helium-neon laser in continuous mode has disinfectant properties and enhances hemodynamic processes in the area of exposure.

However, it is also known that due to the adaptation process of a significant part of the performance impact caused by the change of this factor (in this case, radiation of helium-neon laser).

The invention in part of the way is the development of effective treatment of false myopia by improving hemodynamic performance of the ciliary body when exposed to radiation of helium-neon laser, in order to obtain a consistent visual functions.

The technical result according to the invention is achieved in that in the method of treating false myopia, including exposure radiation of helium-neon laser ciliary body with a total irradiation time of 3-5 min per session and number of sessions 6-8 treatment, the irradiation of p is nyuumon radiation with a frequency of 7.5 rpm and peak width modulation with a frequency of 60-70 Hz power 100-140 µw.

The invention in part of the device is a laser device for the treatment of false myopia, to obtain a stable visual function.

The technical result is achieved by the fact that the laser device for the treatment of false myopia, contains helium-neon laser, power supply, control power, a deflector control unit, the generator of rectangular pulses, an electronic key, a movable cylinder, prism and the front set, and the output of the pulser is connected with the control input of the electronic switch, the output of the power supply is connected to the controlled input of the electronic switch, the output of the electronic switch is connected to the input of helium-neon laser, the output of which is optically connected to the input of the power control, the output of which is optically connected to the input of the deflector, the optical output of which is connected with a movable prism.

The invention is illustrated in the drawing.

The drawing shows a block diagram of a device for treatment of false myopia, containing the power supply 1, a helium-neon laser 2, the control unit power 3, the baffle 4, the control unit 5, the movable head with prism 6, the front set 7, the generator pramogos input electronic key 9, the output of the power supply 1 is connected with a controlled input of an electronic key 9, and controlled output electronic switch 9 is connected to the input of helium-neon laser 2, the output of the HeNe laser 2, is optically connected to the input unit power control 3, the output of which is optically connected to the input of the deflector 4, and the output control unit 5 is connected with deflectors 4, the output of which is optically connected with a movable prism 6.

A method of treating false myopia using laser device according to the invention is carried out as follows: the patient sits and fixed forehead and chin on the front rack setup 7 using the generated scanned with a frequency of 7.5 rpm in two mutually perpendicular planes and amplitude-modulation of the beam helium-neon laser average power 100-140 μw in the form of a dashed circle with a diameter of 2 mm larger than the size of the cornea for the irradiation of the ciliary body.

The ciliary body is irradiated diascleral moving along a circle Multispeed punctulata radiation 3-5 min per session. The number of sessions varies from 6 to 8 in a day. Refraction and visual acuity determined immediately cured after a course is 80 percent of the cases it is possible to obtain a stable treatment effect within 1 year of observation.

Laser device according to the invention, operates as follows.

A square-wave generator 8 generates rectangular pulses with a frequency of 60-70 Hz and a duty cycle equal to two, these pulses to the control input of an electronic key 9, a controlled input connected to the output of the power supply 1, and managed its output connected to the input of a helium-neon laser 1, so is the amplitude of the pulse modulation of the radiation of helium-neon laser 1. This radiation passes through the block power control 3, through which is provided the required average power of the radiation is equal to 100-140 µw and the deflector 4, which provide the desired motion trajectory of the laser spot on the surface of the eyeball of the patient and through the lens 6 mounted on a movable head, means is provided for directing the laser radiation on the patient's eye.

The authors use a known baffle 4 (Y. K. Rebrin "Optical deflector", ed. Tekhnika, Kiev, 1988, S. 129), made in the form of two movable mirrors, the original position of which represents a plane parallel to each other and having an angle of 45° with respect to the direction of laserneedle mirror deflector is controlled by a known control unit 5 (B. I. Gorshkov, "Elements of radio-electronic devices", ed. "Radio I Svyaz', Moscow, 1988, S. 100), made in the form of the generator of sinusoidal oscillations purity of 75 Hz, and the phase shifter providing a phase shift of 90°.

The movable head with prism 6 (laser Lixto, Russia, company "eye microsurgery", 2000) is required for application of the scanned radiation on the patient's eye.

Example 1. Patient P. 15 years. He admitted with a diagnosis of myopia of an average degree (-4,0 D) with spasm of accommodation to 5.5 On both eyes. Visual acuity of 0.1 with correction of 5.5 D=0,9 both eyes.

Patient treatment - transscleral irradiation of the ciliary body according to the invention, the scanning radiation from a helium-neon laser. Altogether there were 8 sessions for 5 min each session: with a frequency of 7.5 rpm and peak width modulation with a frequency of 70 Hz, with a capacity of 140 mW. After treatment accommodation spasm disappeared. After treatment, the visual acuity of both eyes with correction to-4.0 D=1,0. The same indicators of visual acuity remained after six months and after 1 year.

Claims

1. A method of treating false myopia, including exposure radiation of helium-neon laser ciliary body with a total irradiation time of 3-5 Milne circumference, 2 mm greater than the diameter of the cornea, Multispeed punctulata scanning radiation with a frequency of 7.5 rpm and peak width modulation with a frequency of 60-70 Hz, power 100-140 µw.

2. Laser device for the treatment of false myopia, characterized in that it comprises a helium-neon laser, power supply, control power, a deflector control unit, the generator of rectangular pulses, an electronic key, a movable cylinder, prism and the front set, and the output of the pulser is connected with the control input of the electronic switch, the output of the power supply is connected to the controlled input of the electronic switch, the output of the electronic switch is connected to the input of helium-neon laser, the output of which is optically connected to the input of the power control, the output of which is optically connected to the input of the deflector, the optical output of which is connected with a movable prism.



 

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FIELD: medicine.

SUBSTANCE: method involves introducing 0.1-0.3 ml of photosensitizing gel preliminarily activated with laser radiation, after having removed neovascular membrane. The photosensitizing gel is based on a viscoelastic of hyaluronic acid containing khlorin, selected from group containing photolon, radachlorine or photoditazine in the amount of 0.1-2% by mass. The photosensitizing gel is in vitro activated with laser radiation having wavelength of 661-666 nm during 3-10 min with total radiation dose being equal to 100-600 J/cm2. The gel is introduced immediately after being activated. To compress the retina, vitreous cavity is filled with perfluororganic compound or air to be further substituted with silicon oil. The operation is ended with placing sutures on sclerotomy and conjunctiva areas. Compounds like chealon, viscoate or hyatulon are used as viscoelastic based on hyaluronic acid. Perfluormetylcyclohexylperidin, perfluortributylamine or perfluorpolyester or like are used as the perfluororganic compound for filling vitreous cavity.

EFFECT: excluded recurrences of surgically removed neovascular membrane and development of proliferative retinopathy and retina detachment; retained vision function.

3 cl, 5 dwg

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