Safety filter for an ophthalmic therapeutic and/or diagnostic instrument
AssigneeCarl-Zeiss-Stiftung
InventorsRoland Brenner, Josef Schlosser, Peter Reimer
Life of this patent
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Abstract
The invention is directed to a safety filter for an ophthalmic therapeutic and/or diagnostic unit into which a laser beam is coupled for therapeutic purposes. The safety filter is optically dimensioned in such a way that no change in the focal intercept results when the filter is swung into the viewing beam path. The filter largely absorbs the particular laser wavelength.
Claims11
A safety filter assembly for absorbing a defined wavelength in an ophthalmic therapeutic and/or diagnostic instrument, the instrument having an optical system defining a focal intercept and including viewing optics and an objective conjointly defining a viewing beam path of non-parallel rays leading to a target plane at the eye of a patient and the instrument further being equipped with a device for coupling a laser beam of laser radiation into the viewing beam path for therapeutic purposes, the safety filter assembly comprising:
- a safety filter;
- a displacing device for displacing said safety filter from a first position in said beam path without substituting an optical element therefor and for moving said safety filter to a second position outside of said beam path;
- said first position being between the objective and the target plane where the beam path is defined by the non-parallel rays;
- and,
- said safety filter being dimensioned so as to cause said focal intercept to remain unchanged when said safety filter is moved into said second position where the non-parallel rays pass through said safety filter.
A laser adapter for an ophthalmic instrument, the ophthalmic instrument having an optical system defining a focal intercept, said optical system including viewing optics and an objective conjointly defining a viewing beam path of non-parallel rays leading to a target plane at the eye of a patient, the laser adapter comprising:
- optic guiding means for guiding a laser beam into the viewing beam path;
- attachment means for releasably attaching said laser adapter to the ophthalmic instrument;
- a safety filter assembly for absorbing a defined wavelength of the radiation of said laser beam;
- and,
- said safety filter assembly being mounted on said attachment means and including:
- a safety filter;
- a displacing device for displacing said safety filter from a first position in said beam path without substituting an optical element therefor and for moving said safety filter to a second position outside of said beam path;
- said first position being between the objective and the target plane where the beam path is defined by the non-parallel rays;
- and,
- said safety filter being dimensioned so as to cause the focal intercept to remain unchanged when said safety filter is moved into said second position where the non-parallel rays pass through said safety filter.
An ophthalmic therapeutic and/or diagnostic instrument comprising:
- an optical system defining a focal intercept and including first and second viewing optics and first and second objectives;
- said first viewing optics and said first objective defining a first stereoscopic component beam path of non-parallel rays to a target plane and said second viewing optics and said second objective conjointly defining a second stereoscopic component beam path of non-parallel rays to the target plane;
- a device for coupling a laser beam of laser radiation into said component beam paths for therapeutic purposes;
- a safety filter;
- a displacing device for displacing said safety filter from a first position in said beam path without substituting an optical element therefor and for moving said safety filter to a second position outside of said beam path;
- said first position being between the objective and the target plane where the beam path is defined by the non-parallel rays;
- and,
- said safety filter being dimensioned so as to cause said focal intercept to remain unchanged when said safety filter is moved into said second position where the non-parallel rays pass through said safety filter.
Dependencies are inferred from the claim text.