Surgery – Miscellaneous – Methods
Patent
1997-06-06
1999-11-09
Peffley, Michael
Surgery
Miscellaneous
Methods
606 9, A61N 506
Patent
active
059794542
ABSTRACT:
Successful laser treatment of hemangiomas requires selective photocoagulation of subsurface targeted blood vessels without thermal damage to the overlying epidermis. An apparatus for in vivo exposure of laser radiation from a continuous Nd:YAG laser at 1064 nm delivers repetitive cryogen spurts, each having a duration of the order of milliseconds during continuous laser irradiation. Control of the cryogen spray cooling is achieved through monitoring of the radiometric surface temperature of the tissue site and either controlling the repetition rate of the cryogen spurts according to temperature or according to a threshold temperature of the irradiated surface and/or repetition rate of the cryogen spurts according to power density and the duration of continuous irradiation.
REFERENCES:
patent: 5057104 (1991-10-01), Chess
patent: 5344418 (1994-09-01), Ghaffari
patent: 5814040 (1998-09-01), Nelson et al.
Anvari et al, "Dynamic Epidermal . . . Evaluations", Lasers in Medical Science, vol. 10, pp. 105-112, 1995.
Anvari et al, "Spatially Selective . . . Cooling", Applied Optics, vol. 35, No. 19, pp. 3314-3320, Jul. 1996.
Anvari Bahman
Milner Thomas E.
Nelson J. Stuart
Tanenbaum Samuel B.
Dawes Daniel L.
Peffley Michael
The Regents of the University of California
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