Optical system for surgical ophthalmic laser instrument

Details Optical system for surgical ophthalmic laser instrument Optical system for surgical ophthalmic laser instrument

1983-10-28

1985-12-31

Cohen, Lee S.

Surgery

Truss

Pad

128395, 219121LQ, 219121LS, 350171, A61B 1736

Patent

active

045614369

ABSTRACT:
An optical system for a surgical ophthalmic instrument 10 using a YAG laser reduces the size of the components and facilitates their combination with a binocular microscope 11. A parallel plate beam splitter 22 splits a beam 21 from a visible light He-Ne laser 20 into equal and separated He-Ne beams 21a and 21b. A pair of expanders 27 and 37 diverge the He-Ne beams and a beam 30 from the YAG laser 15. The diverging beams are combined on a coincident optical path, which is collimated and coincided with the optical path of microscope 11 between its binocular head 42 and objective 43. There, a mirror 50 coated to reflect the YAG laser light also has a pair of spaced-apart regions 51a and 51b with a second coating to reflect both the He-Ne beams 21a and 21b so that all laser light converges on the patient's eye. The central mirror region 52 is transparent to visible light so that most of the light reflected from the patient's eye is visible to the surgeon. The lasers and other components are mounted on an optical plate 25 secured to a lower support 12 of microscope 11 where controls are convenient and accuracy is assured.

REFERENCES:
patent: 3710798 (1973-01-01), Bredemeier
patent: 3796220 (1974-03-01), Bredemeier
patent: 3828788 (1974-08-01), Krasnov et al.
patent: 4123143 (1978-10-01), Yachin et al.
patent: 4362361 (1982-12-01), Campbell et al.
patent: 4409979 (1983-10-01), Roussel et al.
"Commercial Ophthalmic YAG Lasers" by Stephen L. Trokel, from YAG Laser Ophthalmic YAG Lasers, published Feb. 1983, by Appleton, Century, and Crofts.
"Ophthalmic Neodymium: YAG Lasers" by Richard H. Keates, M.D.; Steven Fry, Ph.D.; and William J. Link, Ph.D., Sep. 1982.
"Nikon Zoom-Photo Slit-Lamp Microscope FS-2", a brochure by Nippon Kogaku K.K.

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