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144 WEBER ET AL. mately 1–2 cm, but may reach 5 to 10 cm in the infrared range.11 Therefore, “penetration depth” must be defined in a different way as for a pricked needle: the diffusion phe- nomena described above leads naturally to a successive diminution of the beam. It is important to define at which degree of diminution a therapeutic effect could still be ex- pected. Manufacturers of mere red light laser devices could also argue that by supposed inductive and snowball effects, even at this wavelength, photons can reach a depth of 10 cm. It is doubtful in this case that some single photons would still generate the desired therapeutic effects by stimulating the acupuncture point. Especially in patients with dark skin, no real effect can be expected when only red lasers are used because of high absorption of skin melanin. Modern fiber-optic laser needle device with 12 channels for treating up to 12 acupuncture points simultaneously with dif- ferent wavelengths. FIG. 3. Green, red, and infrared laser needles coming out of the end of a glass fiber. The term “half penetration depth” indicates the depth at which half of the laser light is absorbed. Provided that the absorption of an individual light quant per cell is considered as the minimum output, a maximum seems possible of 4 mm for green light, 1 cm for red light, and 4–10 cm for infrared light, with the half-penetration depths as specified above (Table 1). Biological Effects of Laser Light General reactions in tissue include decongestion, allevi- ation of pain, improved bloodflow, immune stimulation, and reparation of tissue. Reactions on the Cellular Level The following effects may occur: increase of ATP syn- thesis, stimulation of the antioxidative metabolism, forma- tion of singlet oxygen, stimulation of the mitochondrial me- tabolism, increase of protein biosynthesis, and increase of DNA synthesis and cell renewal. Further Development of Laser Needle Technology In the context of an extensive double-blind study con- cerning disturbances of the lumbar spine, a clearly limited effect of the red light laser on the deep tissue, especially on FIG. 4.PDF Image | Needles of Light: A New Therapeutic Approach
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