Hand-held self-contained electronic tonometer

Details Hand-held self-contained electronic tonometer Hand-held self-contained electronic tonometer

A - Human Necessities

61

B

326/12.7

A61B 3/16 (2006.01)

Patent

CA 1291796

S P E C I F I C A T I O N HAND-HELD SELF-CONTAINED ELECTRONIC TONOMETER ABSTRACT OF THE DISCLOSURE Disclosed is a battery powered, hand-held self-contained electronic tonometer with a digital readout for displaying pressure in millimeters of mercury. The tonometer includes a transducer which is a solid state pressure sensitive element and which produces a voltage proportional to intraocular pressure. An electrical waveform is produced by gently bringing the transducer in contact with the cornea. The waveform is converted to a digital signal and processed by a single chip micro- processor. The baseline of a reference signal is nulled by equalizing the charges on two capacitors on the inputs of two differential amplifiers. Equalizing the differential inputs of the two amplifier stages results in a gain of zero and removes any carrier signal. Microprocessor software detects the baseline condition established by equalizing the differential inputs. The microprocessor then looks for a series of valid measurements and calculates the average intraocular pressure along with an estimate of reliability. This average value and the reliability indicator are displayed on a liquid crystal display.

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