Detection of optical surface of patient interface for ophthalmic laser applications using a non-confocal configuration
US12216272B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 13, 2023 |
| Grant date | Feb 4, 2025 |
| Priority date | — |
| Expiry date | Oct 13, 2043 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J2001/4261
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An ophthalmic laser system uses a non-confocal configuration to determine a laser beam focus position relative to the patient interface (PI) surface. The system includes a light intensity detector with no confocal lens or pinhole between the detector and the objective lens. When the objective focuses the light to a target focus point inside the PI lens at a particular offset from its distal surface, the light signal at the detector peaks. The offset value is determined by fixed system parameters, and can also be empirically determined by directly measuring the PI lens surface by observing the effect of plasma formation at the glass surface. During ophthalmic procedures, the laser focus is first scanned insider the PI lens, and the target focus point location is determined from the peak of the detector signal. The known offset value is then added to obtain the location of the PI lens surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.