Pulse wave measuring apparatus of high measurement accuracy
First Claim
1. A pulse wave measuring apparatus comprising:
- a pressure pulse wave sensor including a plurality of sensor elements, detecting an intra-arterial pressure waveform superficial of a body, a select unit selecting a sensor element located right above an artery out of said plurality of sensor elements based on a sphygmographic waveform detected with said pressure pulse wave sensor, a sphygmographic waveform minutia value calculation unit calculating a minutia value using an amplitude value of a predetermined minutia from the sphygmographic waveform detected with said selected sensor element, a distortion degree calculation unit calculating difference in distortion degree of sphygmographic waveforms detected with respective said sensor elements, based on a sphygmographic waveform detected with said selected sensor element and a sphygmographic waveform detected with at least one sensor element located at a predetermined distance from said selected sensor element, and an amplitude value correction unit correcting said amplitude value of the predetermined minutia using said calculated difference in distortion degree.
1 Assignment
0 Petitions
Accused Products
Abstract
A pulse wave measuring apparatus includes a pressure sensor having a plurality of sensor elements wider in width than the small sensor element required in conventional tonometry. On the basis of differences α and β of an AI value based on a pulse wave signal from the sensor element right above an artery and AI values based on pulse wave signals from two sensor elements located at a predetermined distance from the sensor element right above the artery, α2+β2 is obtained. An AI value correction is calculated using a regression formula with α2+β2 as a correction parameter representing the distortion degree. Using this correction value, the AI based on a pulse wave signal from the sensor element located right above the artery is corrected.
10 Citations
11 Claims
-
1. A pulse wave measuring apparatus comprising:
-
a pressure pulse wave sensor including a plurality of sensor elements, detecting an intra-arterial pressure waveform superficial of a body, a select unit selecting a sensor element located right above an artery out of said plurality of sensor elements based on a sphygmographic waveform detected with said pressure pulse wave sensor, a sphygmographic waveform minutia value calculation unit calculating a minutia value using an amplitude value of a predetermined minutia from the sphygmographic waveform detected with said selected sensor element, a distortion degree calculation unit calculating difference in distortion degree of sphygmographic waveforms detected with respective said sensor elements, based on a sphygmographic waveform detected with said selected sensor element and a sphygmographic waveform detected with at least one sensor element located at a predetermined distance from said selected sensor element, and an amplitude value correction unit correcting said amplitude value of the predetermined minutia using said calculated difference in distortion degree. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
Specification