FACTORS INFLUENCING THE DOSE DELIVERY
1. HIGH CONTINUOUS POWER
The higher the Power delivered to the skin, • the more important the dose to the target tissue, • the deeper the penetration, • the shorter the treatment time, • the better the pain blocking effect.
1W
10W
15W
2. IMPROVING LIGHT PENETRATION
When contact between the Laser head and the skin : • Compression removes competing blood chromophores (blanching), • Opens hair follicles, • Reduces light reflection on the skin between 4-7%, • Collimated beam improves light transmission by increasing energy density, Energy transmitted to the tissues increased by 15%.
3. WAVELENGTH MINIMIZING UNWANTED ABSORPTION
Therapeutic Window
• Interest to both 810 and 980 nm wavelengths due to their ability to be preferentially absorbed by musculoskeletal tissues. • They also minimize the interference of melanin which has an affinity for shorter wavelengths as well as the impact of water within the body which preferentially absorbs longer wavelengths. • Energy that is absorbed by melanin or water in the body is energy that is lost at the target tissue. • The wavelength ratio has to be set depending on the skin colour (melanin concentration).
10 2
Melanin
10 1
Water
Oxy hemoglobin
10 0
10 -1
10 -2
400
600
800
1000 1200 1400
Wavelength (nm)
HIGH CONTINUOUS POWER + ON CONTACT TREATMENT + RIGHT WAVELENGTHS = THERAPEUTIC EFFICIENCY
(1)Clijsen R, Brunner A, Barbero M, Clarys P, Taeymans J. Effects of low-level laser therapy on pain in patients with musculoskeletal disorders: a systematic review and meta- analysis. Eur J Phys Rehabil Med. 2017 Aug;53(4):603-610.
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