Apparatus for dose measurement upon photocoagulation in the fund

Details Apparatus for dose measurement upon photocoagulation in the fund Apparatus for dose measurement upon photocoagulation in the fund

1984-05-22

1987-02-24

Cohen, Lee S.

Surgery

Truss

Pad

128395, 128398, 219121LB, 219121LZ, A61B 1736

Patent

active

046449485

ABSTRACT:
For determining the proper dose of therapy radiation for photocoagulation at the fundus of the eye, the fluorescent radiation excited by the therapy radiation (laser light) in the fundus of the eye is utilized. The fluorescence intensity passes through a characteristic minimum upon the termination of the coagulation process. Apparatus is disclosed for the detection by measurement of this effect. Optical beam splitters are provided to separate the fluorescent radiation from the therapy radiation. An electronically controlled shutter is provided for the passage and blocking off of the therapy radiation. The shutter is closed when the fluorescence intensity reaches a minimum after commencement of coagulation, or when the radiation reaches a predetermined amount, if this occurs before the fluorescence reaches its minimum.

REFERENCES:
patent: 3136310 (1964-06-01), Meltzer
patent: 3809092 (1974-05-01), Abraham
patent: 4120293 (1978-10-01), Muckerheide
patent: 4166695 (1979-09-01), Hill et al.
patent: 4266549 (1981-05-01), Kimura
patent: 4299229 (1981-11-01), Enderby
patent: 4305398 (1981-12-01), Sewa
patent: 4316467 (1982-02-01), Muckerheide
patent: 4412543 (1983-11-01), Vassiadie et al.
Heydenreich et al, "Fluo-Angio Photocoagulation . . . ", Jena Review, vol. 19, No. 2, pp. 107-110, 1974.

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