Patent ID: 6911009
Filing Date: 2005-06-28
Classification: A61B

Abstract:
1. A sphygmogram measure method for measuring pulse pressure at two adjacent measure points, comprising the steps of: Step 1: positioning an upstream pressure sensor and a downstream pressure sensor at a certain distance L in accordance with the bloodstream direction; Step 2: acquiring the signals from the upstream and the downstream pressure sensors and passing the signals through preamplifier and filter circuits and offset adjust circuits to acquire an analog form of upstream pressure P Step 3: converting the analogy analog form of upstream pressure P Step 4: filtering the analog form of upstream pressure P Step 5: detecting the zero-cross signal of the fundamental wave of the upstream and downstream pressure signals to trigger and stop the counting of a counter, and obtaining the time lag τ between the two pressure signals by output of the counter: Step 6: storing the digitized upstream pressure signal P Step 7: calculating the digital downstream pressure P