Optical system for surgical ophthalmic laser instrument
US4561436A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 28, 1983 |
| Grant date | Dec 31, 1985 |
| Priority date | — |
| Expiry date | Oct 28, 2003 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B2018/2025
- WIPO fieldMedical technology
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.