Treatment of cutaneous vascular and pigmented lesions

Details Treatment of cutaneous vascular and pigmented lesions Treatment of cutaneous vascular and pigmented lesions

1994-08-25

1996-12-24

Sykes, Angela D.

Surgery

Instruments

Light application

A61N 506

Patent

active

055869815

ABSTRACT:
According to the invention, a method is provided for disrupting the targeted lesion in skin, such as is necessary in treatment of vascular or pigmented lesions. A microplasma is generated in a target region of skin, the microplasma disrupting the skin ("plasma ablation") to enable removal of the targeted lesion. The microplasma absorbs radiation energy and expands, creating high pressure in the surrounding region which causes disruption of the targeted lesion in that region. A beam of pulsed laser radiation can be used to generate the microplasma by properly controlling the peak irradiance, the pulse duration and the focal spot size of the beam. The invention enables use of a laser having small pulse energy. A synchronized laser beam scan device can be used to scan the beam to provide a highly efficient system for rapid skin treatment.

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"Selective Photothermolysis: Precise Microsurgery by Selective Absoption of Pulsed Radiation", Anderson and Parrish 29 Apr. 1983 vol. 220 pp. 524-527 Science.
"Dynamics of Shock Waves & Cavitation Bubbles Generated by Picosecond Laser Pulses in Corneal Tissue and Water" Juhasz et al Lasers in Surg. & Medicine vol. 15 pp. 91-98(May 1994).
"Intraocular Nd:Yag Laser Surg.: Light-Tissue Interaction, Damage Range, & Reduction of Collateral Effects" A. Vogel et al IEEE Jrnl of Quantum Elec. vol. 26 No. 12 Dec. 1990.

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