Mr. Zhou has battled psoriasis for over two decades. As the CEO of a company with thousands of employees, his daily workload and social engagements keep him perpetually busy. The persistent nature of his psoriasis, resistant to conventional treatments, caused him significant distress. Every business trip required him to carry a large supply of topical ointments and oral medications, yet the skin lesions remained stubbornly persistent. Last year, our editorial team suggested he incorporate home ultraviolet therapy, which yielded remarkably positive results.He promptly purchased a large UV phototherapy unit for his office and carries a portable one for business trips, enabling treatment anytime.Recently preparing for graduate school exams, she visited the clinic anxious about potential flare-ups. Our staff advised continuing phototherapy alongside medication—an idea she initially found hard to believe. In fact, psoriasis patients can achieve hospital-level professional phototherapy at home. She recently called to report excellent sustained results and plans to visit in person after exams to express her gratitude.
The use of artificial ultraviolet light sources (UV phototherapy) to treat psoriasis has a history spanning nearly a century. Narrowband UVB therapy, in particular, is currently the first-line treatment for plaque psoriasis. Widely adopted and recommended by psoriasis treatment guidelines worldwide, it can be administered alone or combined with topical or systemic medications to enhance efficacy, shorten disease duration, and reduce adverse reactions.
Home phototherapy refers to patients using professional home phototherapy devices under medical supervision. First introduced in Sweden in 1979, its efficacy and safety have been evaluated in multiple countries in recent years. This approach allows dermatology patients to conveniently access professional phototherapy at home.Home treatment eliminates the hassle of multiple hospital visits, proving particularly practical for patients whose work, studies, daily life, or physical limitations prevent timely outpatient appointments, or for those undergoing hospital treatment requiring localized intensive therapy.
Psoriasis is a multifactorial complex disease. While many patients achieve remission with effective treatment, a complete cure remains elusive. Therefore, ultraviolet phototherapy represents a highly practical treatment option from both health economics and efficacy/safety perspectives. Literature indicates growing physician willingness to prescribe home phototherapy, with patients also embracing this approach.
The Sigma 308 LED Ultraviolet Light Therapy Device is a solid-state semiconductor device that directly converts electrical energy into ultraviolet light.Each LED consists of a PN junction with unidirectional conductivity. When a forward voltage is applied to the light-emitting diode, holes injected from the P-region into the N-region and electrons injected from the N-region into the P-region recombine near the PN junction with electrons in the N-region and holes in the P-region, respectively, producing spontaneous fluorescent radiation (as shown in Figures 1 and 2).LEDs made from different materials emit light at different wavelengths. UVB LEDs fabricated from third-generation semiconductor material aluminum gallium nitride (AlGaN) can emit ultraviolet light across narrow spectral bands, including UVB with a peak wavelength of 308 nm.
Compared to xenon chloride excimer lamps, the SQ308 LED light source offers the following advantages: ① Low-voltage startup ensures high safety and minimal electromagnetic radiation. In contrast, 308 excimer lamps require high-frequency, high-voltage operation and emit significant radiation during use, making them unsuitable for home applications;② As a solid-state semiconductor light source, it boasts a lifespan exceeding 5000 hours with minimal intensity decay during use. In contrast, 308nm excimer lamps are xenon chloride gas-filled tubes with a lifespan of only about 300 hours, experiencing significant intensity reduction over time;③ The compact size of individual 308nm LED light sources allows flexible configuration into various shapes, a feature unavailable with 308nm excimer lamps. Additionally, the SQ308 LED light source offers significant advantages including environmental friendliness and high portability for home use.
Shanghai Sigma High-Tech Co., Ltd., established in 1992, is a medical instrument company registered in Shanghai. Guided by the mission of "Advancing photomedicine technology to serve human health," the company is dedicated to researching and developing medical devices in the photomedicine field. Strictly adhering to the requirements for medical devices to be safe, reliable, and effective, it has established a high-standard production quality assurance system, transforming proven photomedicine methods into products through technological innovation.Since 2001, Sigma has been consecutively recognized as a "Shanghai High-Tech Enterprise." Its independently developed Model 03 and Model 05 Ultraviolet Phototherapy Devices were both certified as "2002 Shanghai Grade A High-Tech Achievement Transformation Projects."The company's current main products include multiple models of ultraviolet phototherapy devices such as SH1, SH2, SH4, SS01, SS02, SS03, SS04, SS05, SS06, SS07, SS08, SS09, and SS10, as well as sunlight ultraviolet simulation devices and Wood's lamps.
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