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Taiyo Yuki has developed a pulse sensor using a piezoelectric element, which was announced at "MEDTEC Japan 2015" (April 22nd to April 24th, Tokyo Ariake International Convention and Exhibition Center). The sensor uses the piezoelectric effect to measure the vascular wall vibrations that accompany the heartbeat. Compared with an ordinary pulse sensor using an LED, the pulse can be measured with high resolution and low power consumption, and the hardness information of the blood vessel can also be obtained. In the future, field tests will be conducted in medical institutions.
Pulse sensors using LEDs measure the degree of vasodilation caused by blood vessel wall vibrations based on the amount of hemoglobin light absorbed. Based on this, the pulse rate is calculated. The pulse obtained in this way is a "volume waveform" and it is said that the general resolution is low. This time, the sensor can measure high-resolution "acceleration pulse waveform" in real time. A pulse sensor using an LED consumes mW-class power, and this sensor only needs to amplify the μW-level power consumed by the circuit, which is also an advantage.
Since the vibration of the blood vessel wall can be directly detected, the hardness of the blood vessel is known, which is a major feature thereof. In addition to the degree of atherosclerosis, the vascular stiffness is also an “indicator of stress and pain†that the patient feels during surgery and the like (solar induced electricity). It is alleged that the blood vessels become hardened when a large load is applied to the patient.
In the Taiyo Electric Pavilion, a field test prototype “Smart Pulse Analyzer†equipped with a disturbance cancellation algorithm was introduced. A demonstration was made on-site to display the measured real-time pulse waveform via Bluetooth on a tablet. (Reporter: Daxia Xia, "Nikkei Digital Health")
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