Vital signs monitor
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United States of America Patent
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Aug 29, 1989
Issued Date -
N/A
app pub date -
Sep 8, 1987
filing date -
Sep 8, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A vital signs monitor includes an ECG sensor, an oximetric finger probe, a respiration impedance sensor, a respiration strain gauge, and a blood pressure cuff with a pressure sensor. Signals generated by these sensors are processed by a microcomputer which is programmed to cross-reference data from multiple channels in order to improve accuracy. The microcomputer is programmed to select the more regular pulses from the ECG sensor and the finger probe to arrive at a better measure of heart rate. In addition, the microcomputer is programmed to use the strain gauge signal to remove artifacts from the signal generated by the impedance sensor. In this way a more artifact-free measure of respiration rate is obtained. Blood pressure is measured by using timing information derived from pulses sensed by the oximetric finger probe in combination with signals generated by the blood pressure cuff pressure sensor to determine systolic and diastolic pressures of the subject. A calibrated blood pressure waveform is generated automatically from the oximetric finger probe and the blood pressure cuff.
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