RU95523U1 - DEVICE FOR PHOTOTHERAPY OF DERMATOSIS - Google Patents

Abstract

 A device for phototherapy of dermatoses containing an emitter that provides ultraviolet radiation in the therapeutic wavelength range, characterized in that a barrier discharge lamp on working molecules of excited nitrogen (N2 *) with radiation in the wavelength range of 280-420 nm, or working hydroxyl molecules (· OH *) in the wavelength range of 306-320 nm, or a mixture thereof.

Description

The utility model relates to medical equipment, namely, devices for phototherapy of skin diseases.

It is known that when using ultraviolet radiation in medicine to obtain an erythermal effect, the wavelength range (260–300) <λ <400 nm is favorable. Radiation wavelengths λ <300 nm increase the risk of actinic skin carotoses. UVA (315-400 nm) and UVB (280-315 nm) radiation is used for the phototherapy of skin diseases such as psoriasis, neurodermatitis, occupational dermatoses, mycoses. For example, the spectrum of the therapeutic effect of UVB radiation on psoriasis lies in the wavelength range of 296-313 nm [1-3].

Known devices for UV phototherapy, in which a fluorescent lamp is used as an emitter (for example, LER-40 or TL-01) [1]. Such a lamp is a low-pressure mercury lamp in which the short-wave radiation of mercury vapor is converted by a phosphor into radiation useful for phototherapy. A serious drawback of these devices is the presence of mercury in the working environment of the emitter, which makes them unsafe for use in medical institutions and in everyday life (in case of bulb depressurization, demercurization of rooms is required) and requires a special and expensive procedure for disposal of used lamps [4]. Therefore, for example, in the EU countries since 2009, the phased removal of mercury-containing lamps from the production cycle has begun [5]

Known devices for phototherapy in which a pulsed discharge lamp is used as an emitter [6, 7]. The disadvantage of such devices is their complexity: these lamps require forced water cooling, and increased requirements for electrical safety. In addition, since the radiation spectrum of such devices is wide, the use of special filters is required to isolate the treatment part in it.

The closest to a useful model in terms of technical nature and the achieved result is a phototherapy device that provides ultraviolet radiation in the therapeutic wavelength range, in which an N ₂ laser is used as an emitter [8]. The therapeutic effect is achieved by the action of radiation at λ = 337 nm on the affected areas of the skin. The disadvantage of the device is its complexity in maintenance and design in comparison with lamps for phototherapy. In addition, the area of exposure of the affected area of the skin does not exceed 5 mm in diameter.

The objective of the utility model is to simplify the design, increase the service life, avoid mercury-containing emitters and increase the safety of the device.

This problem is achieved due to the fact that the device for phototherapy of dermatoses, containing an emitter that provides ultraviolet radiation in the therapeutic wavelength range, according to the technical solution, contains as an emitter a barrier discharge lamp on working molecules of excited nitrogen (N ₂ *) with radiation in the range wavelengths of 280-420 nm, or on working hydroxyl molecules · OH * in the wavelength range of 306-320 nm, or a mixture thereof.

The lamps used are characterized by a molecular spectrum of radiation corresponding to the treatment region of wavelengths, namely:

The ultraviolet emission spectrum of a barrier discharge lamp on N ₂ * working molecules containing nitrogen with inert gas additives in the region of 300–420 nm is represented by intense bands of electron-vibrational transitions of the second positive molecular nitrogen system C ³ P _u ^→ B ³ P _g , with maxima at λ = 316, 337.1, 358 and 380 nm (Fig. 1).

The ultraviolet emission spectrum of a lamp of a barrier discharge on working molecules · ОН * containing water vapor with the addition of inert gases is represented by the intense band of the A ² ∑ → X ² П band of the molecule ^• ОН *, with a maximum at λ = 309.2 nm (FIG. 2).

The ultraviolet emission spectrum of a lamp of a barrier discharge on the working molecules · ОН * and N ₂ *, for example, containing ammonia water vapors with inert gas additives, is a combination of the spectra shown in Figs. 1 and 2. It contains the intense electron-vibrational bands as indicated transitions of the second positive system of molecular nitrogen, as well as the transition system of the band А ² ∑ → X ² П hydroxyl · ОН *, which, in comparison with the spectrum in Fig. 1, has only three strong peaks at λ = 308.1, 309.2 and 309.5 nm, and other peaks are suppressed.

Structurally, barrier discharge lamps are bulbs of a dielectric material transparent at the working wavelength, on the surface of which there are metal electrodes to which a pulse or sinusoidal voltage with frequencies from a few Hz to several MHz is applied. The designs of these devices can be different (coaxial, planar, cylindrical) depending on the type of working gas, pressure, amplitude and frequency of the applied voltage. Breakdown is carried out between dielectric barriers, creating a nonequilibrium plasma, the electron energy of which can reach several electron-volts, while the characteristic temperature of heavy particles is comparable to the temperature of dielectric barriers and does not exceed, as a rule, 100 ° C. The use of a barrier discharge ensures the purity of the emission spectra, the durability of the working environment, and electrical safety of operation. The described lamps allow you to irradiate extended areas of the skin. In addition, the use of these lamps as a radiator greatly simplifies the design of the radiator, and the working media that we used do not contain mercury.

For example, a coaxial type barrier discharge lamp on N ₂ * working molecules with a flask emitting surface area of 61 cm ² , in the Ar / N ₂ working mixture = (70 ÷ 250) / 1 and in the partial pressure range from 100 to 700 Torr provided density radiation power from 1 to 2 mW / cm ² . This is sufficient to ensure a minimum erythermal radiation dose (and, accordingly, a therapeutic effect) during the exposure time of several minutes [1]. The device is powered by voltage pulses of tens of kilohertz with an amplitude of up to 7.5 kV, which corresponds to currents through the lamp of the order of several milliamps. Therefore, in comparison with analogues and prototype (where current values can reach amperes), the proposed device is electrically safe. The use of a barrier discharge ensures the purity of the spectrum and a significantly longer service life of the working medium compared to electrode discharge lamps and an N ₂ laser. The device allows you to irradiate an extended area of skin up to 60 cm in length and 3 cm in width and can be scaled due to the geometry of the flask to increase or decrease the irradiation zone. The device does not require special water cooling and / or a complex power supply and start-up circuit, as required by pulsed discharge lamps and an N ₂ laser.

Similar advantages are obtained by the use of barrier discharge lamps on working molecules · ОН * and a combination of working molecules N ₂ * and · ОН *.

Thus, the proposed solution simplifies the design, increases the service life and irradiation area, allows the use of environmentally friendly working media emitters and increases the safety of the device.

Literature

1. Reference book on lighting engineering / Ed. Yu.B. Aizenberg. - M., 2008 .-- S.736-741.

2. Parrish J.A., Jaencke K.F. Action spectrum for phototherapy of psoriasis // J. Invest. Dermatol. - 1981. - V.76. - P.359-362.

3. Cole C.A., Forbes P.D., Davies R.E. An action spectra for carcinogenesis // Photochem. Photobiol. - 1986.- V.43. - P.275-284.

4. Wolsey R. The Lamp Disposal Controversy // Lighting Futures. - 1998. - V.3. - No. 2. - P.1-4.

5. All changes in the lighting market // www.osram.com/incandescent 199R104GB OSRAM CRM CC.

6. Lymin V.A., Druzhinin V.N., Cherniy A.N. A device for local phototherapy of dermatoses // Patent RU 2195342 C1 (A61N 5/06). - Priority 09/11/2001. - Publ. 12/27/2002.

7. Davenport S.A., Gollnick D.A. System and method for dermatological lesion treatment using gas discharge lamp with controllable current density // Patent appl. US 2009/0093799 A1 (A61B 18/18, A61N 5/06). - Publication data 04/09/2009.

8. Zimmer J.P. Pulsed UV laser treatment of recurring skin disorders // Patent appl. US 2008/0172046 A1 (A61B 18/20). - Publication data 07/17/2008.

Claims (1)

A device for phototherapy of dermatoses containing an emitter that provides ultraviolet radiation in the therapeutic wavelength range, characterized in that the barrier lamp on working molecules of excited nitrogen (N ₂ *) with radiation in the wavelength range of 280-420 nm is used as an emitter, or on working hydroxyl molecules (· OH *) in the wavelength range of 306-320 nm, or on their mixture.