A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
A61B 18/20 (2006.01) A61B 17/36 (1990.01)
Patent
CA 2131750
A process for the permanent destruction of unwanted human hair. Hair duct in a section of skin in which the unwanted hair is growing is contaminated with contaminant comprised of a very large number of small particles having a high absorption at at least one frequency band of light. The skin section is then illuminated with a series of short pulses of light at the frequency band of high absorption, the first of said short pulses having sufficient energy to cause a large number of the particles to explode into two or more fragments so as to spread said contaminant in said hair ducts and subsequent pulses having sufficient energy to cause a large number of the fragments to further explode into additional fragments to further spread the contaminant in the hair duct, the explosions and energy transferred to and from said particles and fragments causes damage to skin tissue surrounding said hair ducts so as to cause death to the hairs growing in the ducts. In a preferred embodiment the particles are 1 micron graphite particles and each section is illuminated with about 5 laser pulses at 1.06 micron wavelength produced by a Nd:YAG laser, each pulse having an energy density of about 3 Joules/cm2 and a pulse width of about 10 nano seconds.
Shapiro Cohen
Thermolase Corporation
LandOfFree
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