BLOOD PRESSURE CALCULATION METHOD BASED ON PULSE REFLECTED WAVE TRANSIT TIME, AND BLOOD PRESSURE METER

摘要

A method for calculating blood pressure based on pulse return wave transmission time, and a blood pressure monitor have been provided. The method comprises the following steps: S1: collecting and storing pulse waveform data at a fingertip; S2: processing said pulse waveform data to obtain a heart rate and parameters of a plurality of pulse periods, detecting time axis coordinates of a primary wave starting point SPL1 of a pulse wave and a growth point SPL2 of a return wave in each of said pulse periods, and calculating a corresponding pulse return wave transmission time RWTT: RWTT = SPL2 - SPL1; S3: calculating the pulse return wave transmission time RWTT in each of said pulse periods to form a RWTT array; and S4: calculating systolic and diastolic pressures based on said RWTT array and the heart rate. The present blood pressure calculation method and blood pressure monitor measure a fingertip pulse using only one sensor, thus achieving simplicity, convenience, and quickness. By analyzing a correlation theory basis of a pulse return wave and a human blood pressure, correlation models between RWTT and a systolic pressure as well as a diastolic pressure are established, and the systolic pressure and the diastolic pressure are calculated according to two blood models. The systolic pressure and the diastolic pressure, calculated by means of the present method, have higher accuracy, less error, and board range of application.