Mr Zhou suffered from psoriasis for more than 20 years, a thousands of people company's boss, daily work affairs and social functions, so that he is busy, psoriasis is not cured for a long time, which makes him very troublesome, every time he travelled, he had to bring with him a large number of topical ointment and oral medication, but still can not completely remove the lesions, last year, I suggested that he cooperate with the family ultraviolet light therapy, the effect is very obvious. He gladly bought a large ultraviolet light therapy instrument, put the company to do; travelling with a small, can be done at any time.

　　Xiao Li is a college student, but the history of psoriasis has more than ten years, experts recommended her external drugs and ultraviolet light treatment, lesions clear up to nearly 90%; recently she is ready to study for the exams, worried about aggravation of the condition of the anxiety to the outpatient preparation, I suggest that she can continue to cooperate with the phototherapy, the beginning of her feel incredible. In fact, psoriasis patients at home can also be as in the hospital for the same professional light therapy. Recently, she called me to tell me that the effect of the treatment is maintained very well, to be after the examination to make a special trip to thank.

　　The use of artificial ultraviolet light source treatment (i.e. ultraviolet phototherapy) for psoriasis has a history of nearly 100 years. In particular, narrow-spectrum medium-wave ultraviolet light is the first-line therapy for treating psoriasis of common type, which is the most widely used and is recommended by the guidelines of psoriasis treatment in various countries. It can be carried out individually, or through the combination of topical or systemic medication to increase the efficacy, shorten the course of the disease, and reduce the adverse reactions.

　　Home phototherapy is a form of phototherapy in which patients are treated at home with professional home phototherapy products under the guidance of a doctor. It was first developed in Sweden in 1979 and has been evaluated for efficacy and safety in various countries in recent years: home phototherapy makes it easy for dermatological patients to enjoy professional phototherapy at home. Patients in the home treatment, reducing the trouble of multiple trips to the hospital, especially for work and study, life or physical inconvenience or can not come to the outpatient clinic treatment of patients, or is being treated in the hospital but local need to intensify the treatment of patients, can be practical.

　　Psoriasis is a multifactorial and complex disease, although many patients can be treated effectively without recurrence, but at present it can not be completely cured, so no matter from the point of view of health economics or efficacy and safety considerations, ultraviolet phototherapy is a very realistic treatment option; literature shows that more and more physicians are willing to prescribe, and patients are happy to accept home phototherapy.

　　The Sigma 308LED UV phototherapy device is a solid-state semiconductor device capable of directly converting electrical energy into UV light. Each LED consists of a PN junction with unidirectional conductivity. When the light-emitting diode with forward voltage, from the P region injected into the N region of the hole and from the N region injected into the P region of the electron, in the vicinity of the PN junction with the N region of the electron and the P region of the hole, respectively, to complex, resulting in spontaneous emission of fluorescence (Figure 1, 2). LED made of different materials will emit different wavelengths of light, the third generation of semiconductor materials, aluminium gallium nitride (AlGaN) made of UVBLEDs, can emit a peak wavelength of 308nm, such as UVB each narrow spectral wavelength of the ultraviolet light.

　　Relative to xenon chloride excimer lamps, SQ308LED light source has the following characteristics: ① low voltage can be started, high security, electromagnetic radiation is small, 308 excimer lamps need a high frequency and high voltage to start running, running high radiation, not suitable for home use; ② light source is a semiconductor solid-state light source, life of up to 5000 hours or more, the use of the intensity of the process of virtually no decline, 308 Excimer lamp is built-in xenon chloride gas lamp, life expectancy of only 300 hours or so, with the cumulative increase in the use of time, the intensity of the lamp will occur to a greater degree of attenuation; ③ 308nmLED single light source compact size, can be flexibly combined into different shapes, 308 excimer lamps do not have this characteristic. At the same time SQ308LED light source also has a significant advantage of environmental protection and high portability at home.

　　Shanghai Sigma Hi-Tech Co., Ltd. was founded in 1992 and is a registered medical instrument company in Shanghai. With the tenet of "developing optical medicine technology and serving human health", the company is committed to the research and development of medical devices in the field of optical medicine, strictly following the requirements that medical devices must be safe, reliable and effective, and has set up a high-standard production and quality assurance system to transform effective optical medicine methods into products through technology. Sigma has been awarded "Shanghai High-tech Enterprise" since 2001, and the self-developed 03 and 05 UV phototherapy instruments have been awarded "2002 Shanghai A-class high-tech achievement transformation project". At present, the company's main products are SH1, SH2, SH4, SS01, SS02, SS03, SS04, SS05, SS06, SS07, SS08, SS09, SS10 and other types of ultraviolet phototherapy apparatus, daylight ultraviolet simulation device and Wood's lamp and so on.

　　Consultation Tel: 021-64325721

　　Address：11/F, Building 8, No.388 Shuanglian Road, Xujing Town, Qingpu District, Shanghai, China.

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