Automatic blood pressure monitor having reduced data loss sensitivity to cuff pressure changes
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United States of America Patent
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Jan 25, 1994
Grant Date -
N/A
app pub date -
Jan 25, 1993
filing date -
Jan 25, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An automatic blood pressure monitor having a blood pressure cuff, an air pump applying pressurized air to the cuff, an air valve selectively venting the cuff, and a pressure transducer generating an output signal having a D.C. component indicative of the steady-state pressure in the cuff, and an A.C. component indicative of oscillometric pulses. The pressure transducer output is amplified and applied to an analog-to-digital converter which generates a digital word indicative of the steady-state cuff pressure. The amplified pressure transducer output is also applied to one input of a differential amplifier having an output that is applied to an analog-to-digital converter having a limited operating range. The other input of the amplifier receives an offset signal from a voltage source to offset the amplified pressure transducer output so that the output of the differential amplifier will not exceed the operating range of the analog-to-digital converter.
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