Rebound tonometry method and apparatus
US11026577B2 · kind B2 · utility
1Cited by
10References
20Claims
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Key dates
| Filing date | Jun 13, 2018 |
| Grant date | Jun 8, 2021 |
| Priority date | — |
| Expiry date | Apr 22, 2039 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B3/0025
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Viscoelastic properties of the cornea are derived from an ophthalmic measurement signal representing velocity as a function of time of a contact probe rebounded by the eye. The viscoelastic properties include a “Lost Energy Ratio” (LER), a “Time Shift” (TS), a damping parameter (σ), and an elastic parameter (η). An improved method for determining intra-ocular pressure from the measurement signal is also disclosed, wherein a first derivative of the measurement signal at a moment in time when velocity of the probe is zero due to contact of the probe with the cornea is calculated and correlated to an intra-ocular pressure value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.