Electronic sphygmomanometer

摘要

An electronic sphygmomanometer of simplified construction. Systolic and diastolic blood pressure are both indicated by the flashing of a light emission diode on receiving the Korotkov sound signals. A filtering circuit for passing Korotkov sound signals and eliminating pulse sound signals and other noise is used which has a passband with a low cutoff frequency of approximately 40 Hz with a sharp slope and high cutoff frequency of approximately 90 Hz with a gradual slope.