Spencer, Frank & Schneider
Measurement of transmission velocity of pulse wave
 A device for measuring a transmission velocity of a pulse wave includes sensors for sensing heart sounds, and pulse wave signals at upstream and downstream sides of a blood flow. Analog to digital conversion circuitry, coupled to the sensors, converts signals from the sensors from analog to digital form. A data processor, coupled to the analog to digital conversion circuitry processes data received from the analog to digital conversion circuitry. A display device, coupled to the data processor, displays waveforms and numerical data received from the data processor. The data processor includes seven processing units. A first processing unit, coupled to the analog to digital conversion circuitry, detects a first heart sound and generates a marker signal. Second and third processing units, coupled to the analog to digital conversion circuitry, transform digital signals received from the analog to digital conversion circuitry into data for display. A fourth processing unit, coupled to the first, second, and third processing units, detects the marker signal from the first processing unit and obtains predetermined data from the data received from the second and third processing units. A fifth processing unit, coupled to the second and third processing units, temporarily stores data received from the second and third processing units. A sixth processing unit, coupled to the fourth processing unit, determines a transmission time of a pulse wave to derive a transmission velocity of the pulse wave. A seventh processing unit, coupled to the sixth processing unit, transforms signals from the sixth processing unit for display. 
Sankyo Company, Limited
A
A61B
inventional
Masaaki Masatoshi Nobuaki
Takahashi Nishimura Nakatsubo