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Comb nozzle for Rikta device
Alopecia is a common disorder affecting more than half of the population worldwide. Androgenetic alopecia, the most common type, affects 50% of males over the age of 40 and 75% of females over 65. Only two drugs have been approved so far (minoxidil and finasteride) and hair transplant is the other treatment alternative. Controlled clinical trials demonstrated that LLLT stimulated hair growth in both men and women. Among various mechanisms, the main mechanism is hypothesized to be stimulation of epidermal stem cells in the hair follicle bulge and shifting the follicles into anagen phase.
It has long been known that red or near‐infrared laser light promotes tissue repair and regeneration and low‐intensity light called low‐level laser therapy (LLLT) stimulates cellular activity 1. After the discovery of lasers in the 1960s, there has been tremendous interest in using these laser devices to treat various medical conditions. The most commonly used devices have wavelengths in the range 500–1,100 nm (the so‐called optical window of tissue) and they deliver fluences of 1–10 J/cm2 with a power density of 3–90 mW/cm2. LLLT has shown beneficial effects for a variety of medical conditions such as wound healing, nerve regeneration, joint pain relief, stroke recovery, and the prevention and treatment of mucositis 2-8. Home‐use LLLT devices that emit low power coherent monochromatic red light have been developed for various skin conditions, including hair growth
In the late 1960s, Endre Mester, a Hungarian physician, began a series of experiments on the carcinogenic potential of lasers by using a low‐power ruby laser (694 nm) on mice. Mice were shaved as a part of the experimental protocol. To Mester's surprise, the laser did not cause cancer but instead improved hair growth around the shaved region on the animal's back 23. This was the first demonstration of “photobiostimulation” with LLLT, and it opened a new path in the field of medicine
In 2007 and 2011, LLLT mediated by a laser comb was approved by the FDA as a safe treatment for male and female pattern hair loss respectively