Force-triggered applanation tonometer
US4624235A · kind A · utility
7Cited by
2References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 13, 1984 |
| Grant date | Nov 25, 1986 |
| Priority date | — |
| Expiry date | Apr 13, 2004 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B3/16
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A portion of the cornea or similar flexible membrane is flattened by urging against the cornea a footplate with a measurable force and deriving a signal proportional to the magnitude of the applanated area of the cornea when the applanating force is compared to a threshold which corresponds to a force equal to a selected reference force on the planar footplate contacting the cornea. When the selected reference force signal is reached the area of the applanated region of the cornea is transferred as a signal for scaling by another signal proportional to the force.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.