Equipment for detecting, monitoring, measuring, displaying and recording pulse and heartbeat

摘要: An inexpensive, compact and portable instrument using two photoelectric cells in a sensitive Wheatstone bridge, an operational amplifier ambient light sources arranged to easily engage the finger or other parts of human body at frequent intervals detect pulsatile blood changes vascular bed provide visual audible indication corresponding pulse heartbeat. Also, heartbeat can be measured ratetime patterns recorded for various diagnostic purposes including identification suspected allergens toxic substances.