Calibration process for femtosecond laser intraocular lens modification system using video and OCT targeting
US12042434B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 8, 2020 |
| Grant date | Jul 23, 2024 |
| Priority date | — |
| Expiry date | Oct 10, 2040 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F2009/00897
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The XYZ beam position of an ophthalmic laser system is calibrated by measuring a fluorescent signal induced by the focused laser beam in a thin glass coverslip via multiphoton absorption. A video camera measures the XY position and intensity of the fluorescent signal as the focused laser beam strikes the coverslip. The Z position of the focus is determined by scanning the targeted z position and identifying the Z scanner position of peak fluorescence. An OCT system measures the real space Z location of the coverslip, which is correlated with the Z scanner position. Other laser system parameters are assessed by repeatedly scanning a lower energy laser beam in a piece of IOL material, and observing damage (scattering voids) formation in the IOL material. Based on the rate of damage formation, laser system parameters such as beam quality, numerical aperture, pulse energy, and pulse duration, etc. can be assessed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.