Erroneous impingement protective device for laser system

Details Erroneous impingement protective device for laser system Erroneous impingement protective device for laser system

1985-05-17

1986-11-18

Coven, Edward M.

Surgery

Truss

Pad

219121LA, A61N 300

Patent

active

046229710

ABSTRACT:
A plurality of light detector pairs are spaced around the emitter end of a surgical laser handpiece with different, converging directivities to sense pilot beam reflections from a target. Their differentially compared outputs are applied to a distance determining unit having an adjustable threshold or majority decision level to detect when the end of the handpiece is at a desired distance from the target, whereupon the main laser beam is activated. Such a majority distance determination reduces activation errors due to the reflective characteristics and contours of the target surface and the angle of the handpiece.

REFERENCES:
patent: 3123066 (1964-03-01), Brunley
patent: 3329818 (1967-07-01), Woehl
patent: 3595220 (1971-07-01), Kawahara
patent: 4213704 (1980-07-01), Burns et al.
patent: 4266549 (1981-05-01), Kimura
patent: 4273111 (1981-06-01), Tsukaya
patent: 4438705 (1984-03-01), Wilinsky

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