Contrast adjustor for aiming laser

Details Contrast adjustor for aiming laser Contrast adjustor for aiming laser

1990-05-18

1991-10-15

Shay, David

Surgery

Instruments

Light application

606012, 128395, A61N 506

Patent

active

050571028

ABSTRACT:
A laser treatment apparatus is to treat a site of disease of a patient with a laser beam. The laser treatment apparatus contains a source of illumination light for irradiating a site of treatment of the patient and a site around the site of treatment with the illumination light; a source of aiming light for irradiating the site of treatment with the aiming light; a light-receiving device for receiving a light reflected from an aiming site to which the aiming light is applied and from a site around the aiming site; a setting means for comparing a ratio of a quantity of light reflected from the aiming site, as received by the light-receiving means, to a quantity of light reflected from the site around the aiming site with a predetermined ratio; and a control unit for controlling an illuminance of the aiming light with respect to the illumination light by adjusting a ratio of the quantity of light reflected from the aiming site to the quantity of light reflected from the site around the aiming site so as to reach a predetermined ratio.

REFERENCES:
patent: 4316467 (1982-02-01), Macherheide
patent: 4409979 (1983-10-01), Roussel et al.
patent: 4644948 (1987-02-01), Lang et al.
patent: 4648892 (1987-03-01), Kittrell et al.
patent: 4741612 (1988-05-01), Berngruber et al.
patent: 4768513 (1988-09-01), Suzuki
patent: 4917486 (1990-04-01), Raven

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