Measuring and testing – Ductility or brittleness
Patent
1975-07-28
1976-11-23
Gill, James J.
Measuring and testing
Ductility or brittleness
A61B 316
Patent
active
039929264
ABSTRACT:
A pressure-measuring apparatus and method is described for providing a digital readout of the intra-ocular pressure of an eye. The apparatus comprises a transducer for applanating the cornea of an eye and providing a variable output proportional to pressure as the transducer is applied to the cornea. Electronic means responsive to a change in the output of the transducer is coupled to the transducer for providing a digital readout of the pressure sensed by the transducer when there is a change in the slope of the output of the transducer and the change in the slope has a predetermined polarity and exceeds a predetermined rate. Means are also provided for simultaneously displaying at least four digital readouts of pressure corresponding to four successive pressure measurements. The multiple readouts permit an operator to use the lowest of the four readouts as an accurate measure of intra-ocular pressure when the measurements are taken from a given eye.
REFERENCES:
patent: 3390572 (1968-07-01), Murr
patent: 3406565 (1968-10-01), Murr
patent: 3452589 (1969-07-01), Hargens et al.
patent: 3677074 (1972-07-01), Murr
patent: 3724263 (1973-04-01), Rose et al.
Becker Warren M.
Ber-Tek, Inc.
Ciarlante Anthony V.
Gill James J.
Gregg Edward B.
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