发明名称 |
HAND-HELD SELF-CONTAINED ELECTRONIC TONOMETER |
摘要 |
S P E C I F I C A T I O N HAND-HELD SELF-CONTAINED ELECTRONIC TONOMETER 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 microprocessor. 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. |
申请公布号 |
CA1291796(C) |
申请公布日期 |
1991.11.05 |
申请号 |
CA19860522025 |
申请日期 |
1986.11.03 |
申请人 |
DESIGN TEAM PARTNERS |
发明人 |
FELDON, STEVEN;WALLACE, DAVID;MEZACK, GARY;MONSOUR, ROBERT A. |
分类号 |
A61B3/16 |
主分类号 |
A61B3/16 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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