Sphygmorgh measure method and device for pulse pressure and blood flow rate
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United States of America Patent
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Dec 7, 2004
Issued Date -
N/A
app pub date -
Apr 24, 2003
filing date -
Apr 26, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A sphygmogram measure method and device, which detects pulse pressure and blood flow rate simultaneously, includes an upstream and a downstream pressure sensors provided to measure the pulse pressure of two adjacent points on radial artery. The time lag of pulse wave passing through the two pressure sensors is obtained by a time delay detection circuit. The values of pulse pressure at the upstream pressure sensor and time lag are inputted into a digital signal process unit for calculating the value of pulse pressure at the downstream pressure sensor. A thermal image device and an optical displacement sensor are used to measure the unstressed vessel's diameter and the variation of vessel's diameter. A viscometer measures the blood viscosity coefficient of blood specimen. All the values above are used to calculate vessel compliance and blood flow rate as a helpful reference of human's health status.
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