Investigation PPG sensor and reflected intensity of the LED irradiated light

The hemodialysis tube is often regarded as the lifeline of dialysis patients. If the tube is blocked, it will not only cause panic in the patient, but also delay the course of treatment, and may even cause complications such as arterial embolism. This study uses the principle of PPG photoplethysmography. That is, by measuring the reflected intensity of the LED irradiated light, the blood vessel volume change caused by the pulsation is measured.