Mr. Zhou suffers 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 goes on a business trip, he has to take with him a large number of topical ointment and oral medication, but still can't completely remove the skin lesions, last year, I suggested that he cooperate with the family ultraviolet light therapy, and the effect is very obvious. He gladly bought a large ultraviolet light therapy instrument, put the company to do; travel with a small, can be done at any time.

　　Li is a college student, but the history of psoriasis for more than 10 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 anxiety to the outpatient preparation, I suggest that she can continue to cooperate with phototherapy, she felt incredible at the beginning. 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 combined with topical or systemic medication to increase the therapeutic efficacy, shorten the course of the disease, and reduce the adverse effects.

　　Home phototherapy refers to the phototherapy mode in which patients use professional home phototherapy products at home under the guidance of doctors. 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 dermatology 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 strengthen the treatment of patients, can be practical.

　　Psoriasis is a multifactorial complex disease, although many patients can be treated effectively without recurrence, but at present can not be completely cured, so whether from the health economics point of view 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 aluminum 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 attenuation, 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 feature. 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 established a high-standard production and quality assurance system to transform effective optical medicine methods into products through technology. Sigma has been awarded as "Shanghai High-tech Enterprise" since 2001, and the self-developed 03 and 05 UV phototherapy instruments have been recognized as "2002 Shanghai Grade A 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 UV phototherapy instruments, daylight UV simulation devices and Wood lamps.

　　Consulting telephone: 021-64325721

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

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