HAIR AND LESION REMOVAL AND TREATMENT OF CUTANEOUS CONDITIONS

WIPO Patent Application WO2005074830

A3

A method is proposed for achieving long-term or permanent hair reduction or removal is proposed, which uses low optical energy density levels, typically 5 Joules/cm 2 or less, which is possible by exploiting the differential in the thermal relaxation time of the hair shaft and surrounding melanin in the basal and epidermal layers, namely that the thermal relaxation time of the hair shaft is long compared to that of the individual melanin cells. Therefore, for a given temperature rise, the hair shaft will remain at an elevated temperature for longer than the melanin cells, because the heat diffusion rate is much slower. A sequence of optical pulses, the "pulse train", is delivered to the treatment site, with ability being provided for the pulses of the pulse train to have a variable duration, intensity and duty cycle. The total optical energy delivered causes a temperature rise in the tissue dependant upon the wavelength, energy density, pulse duration and the tissue parameters of skin colour (which is determined by the melanin content of the skin), the presence of hair and other pigment-containing structures.

WO/1989/012239	OPTICAL FIBER FOR GUIDING LASER
JP2004201995	LASER TREATMENT APPARATUS
WO/2016/185734	ENDOSCOPE SYSTEM

KIERNAN MICHAEL NOEL (GB)

PCT/GB2005/000285

September 29, 2005

January 28, 2005

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CYDEN LTD (GB)
KIERNAN MICHAEL NOEL (GB)

A61B18/20; A61B18/18; (IPC1-7): A61B18/20

WO1999032193A1

1999-07-01

US6676654B1	2004-01-13
US20030036751A1	2003-02-20
US6080147A	2000-06-27
US20010029364A1	2001-10-11

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