Non-contact tonometer having non-linear pressure ramp

Details Non-contact tonometer having non-linear pressure ramp Non-contact tonometer having non-linear pressure ramp

1998-07-13

2000-12-12

O'Connor, Cary

Surgery

Diagnostic testing

Testing aqueous humor pressure or related condition

A61B 316

Patent

active

061591483

ABSTRACT:
A non-contact tonometer having a fluid pulse generating system for causing corneal applanation is improved by changing the pressure versus time characteristics of the fluid pulse from a linearly increasing relationship of the prior art to a non-linearly increasing relationship which reduces the impulse energy delivered to the eye during testing for purposes of patient comfort. In a preferred embodiment, an automatically driven piston for producing an air pulse is provided with a linearly increasing current source for driving the piston mechanism, whereby the pressure ramp of the air pulse increases as a squared function of time to reduce impulse energy delivered to the eye.

REFERENCES:
patent: 4996990 (1991-03-01), Hideshima
patent: 5002056 (1991-03-01), Takahashi et al.

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