Differential pressure applanation tonometer

Surgery – Truss – Pad

Patent

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Details

Other Related Categories

128652, A61B 316

Type

Patent

Status

active

Patent number

048607550

Description

ABSTRACT:
An applanation tonometer for sensing the intraocular pressure of the eye. The tonometer includes coaxial inner and outer probes which are placed in contact with the eye. The difference in longitudinal forces applied by the eye to the inner and outer probes is measured and the intraocular pressure is determined therefrom. The total pressure applied to the eye by the tonometer is not measured as only the differential pressure on the two probes is needed. The tonometer may include a feedback mechanism to oppose relative longitudinal movement between the probes, thus improving the linearity, accuracy and stability of the instrument. The differential-pressure sensing circuitry includes a sample-and-hold circuit for receiving the measured result and supplying it to an indicating meter. The circuitry also includes compensating means for compensating for the force effects of gravity on the masses of the device. Finally, a level sensing circuit is used to indicate that a complete measurement has been made when a predetermined force has been applied to the eye by the outer probe.

REFERENCES:
patent: 2708928 (1955-05-01), Zenatti
patent: 2966795 (1961-01-01), Smyth
patent: 3049001 (1962-08-01), Mackay et al.
patent: 3070087 (1962-12-01), Sittel
patent: 3184960 (1965-05-01), Murr et al.
patent: 3376735 (1968-04-01), Garber et al.
patent: 3390572 (1968-07-01), Murr
patent: 3572319 (1971-03-01), Bittner et al.
patent: 4766904 (1988-08-01), Kozin et al.
"Fast, Automatic Ocular Pressure Measurement Based on an Exact Theory", IRE Transactions on Medical Electronics, Mackay & Marg, Apr. 1960, pp. 61-67.
"Tonometry: the Informed Choice", Distributed by Optical Radiation Corp., Ophthalmic Products Div., 1300 Optical Drive, Azusa, CA 91702.

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