Indentation tonometer

Details Indentation tonometer Indentation tonometer

1978-06-30

1980-03-11

Howell, Kyle L.

Surgery

Truss

Pad

A61B 316

Patent

active

041923170

ABSTRACT:
An indentation tonometer is contained within a hand holdable housing below which extends a foot plate and a movable plunger. An optical encoder is disposed within the housing and has a ruled scale that is fixed relative to the foot plate and an adjacent ruled scale that is movable relative to the fixed scale. The movable scale engages an upper surface of the plunger and is elevated to a position corresponding to the position of the plunger relative to the foot plate as intraocular pressure is measured. Components for the optical encoder are arranged within the housing to produce a digital readout. The foot plate and plunger are preferably arranged in a subassembly that is vertically movable relative to the housing with suitable switches arranged for detecting when a reading is completed and for automatically calibrating the instrument on the test block. The foot plate and pluger are readily removable, plungers are interchangeable, and the instrument preferably has a memory capable of storing the data from measurement of two eyes.

REFERENCES:
patent: 3062042 (1962-11-01), Gulden
patent: 3070087 (1962-12-01), Sittel
patent: 3070997 (1963-01-01), Papritz et al.
patent: 3266301 (1966-08-01), Sovatkin
patent: 3564907 (1971-02-01), Holcomb et al.
patent: 3724263 (1973-04-01), Rose et al.
patent: 3796498 (1974-03-01), Post
patent: 3992926 (1976-11-01), Berryhill
patent: 4115008 (1978-09-01), Shepherd
Berkeley Bio-Engineering Pamphlet, Electro-Medical Technology, Inc. pamphlet.

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