Surgery – Instruments – Light application
Patent
1992-12-31
1994-05-17
Pellegrino, Stephen C.
Surgery
Instruments
Light application
606 6, 606 10, 359385, A61B 1736
Patent
active
053123930
ABSTRACT:
A system for lighting a field for diagnosis or microsurgery, especially eye surgery. Basically, in one embodiment a ring light having a diameter sufficient to surround the objective lens of a surgical microscope is mounted on a housing adjacent to the objective lens. The ring light provides broad, shadowless illumination over the surgical site. In addition, where surgery of the cornea is to be undertaken, a ring of light is reflected from the cornea surface and can be observed through the microscope as indicative of astigmatism. In alternate embodiment, two smaller ring lights are mounted on the housing surrounding and coaxial with the microscope entrance pupils. In this case two circular rings in a figure eight configuration are projected onto the cornea. A light intensity varying mechanism controls ring light intensity. A center light is provided between the objective lenses providing a point source for uniformly illuminating the central portion of the microsurgery site. Preferably, the center light is a fiber optic light source. A separate intensity controlling mechanism is provided for the center light, so that the intensity of each light can be independently varied, as desired. This lighting arrangement provides much less glare in the eyes of the surgeon and lower intensity and greater comfort for the eye of a patient.
REFERENCES:
patent: 3796220 (1974-03-01), Bredemeier
patent: 4527870 (1985-07-01), Esmay
patent: 4719912 (1988-01-01), Weinberg
patent: 4887892 (1989-12-01), Bacus
patent: 4898439 (1990-02-01), Mori
Gilliam Frank D.
Harris Sonya
Pellegrino Stephen C.
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