NON-INVASIVE BLOOD PRESSURE MEASURING APPARATUS AND MEASURING METHOD THEREOF

摘要

A non-invasive blood pressure measuring apparatus and a measuring method is provided. A host (1) is provided with a microprocessor coupled with an air pressure sensor. A pressurized cuff (2) is an inflatable cuff with a gas tube connected with the air pressure sensor, and fastened to a body portion where user's artery blood flow can be blocked completely after air inflation. A pulse wave detector (3) is fixed at a downstream position of the pressurized cuff (2) according to the artery blood flow direction. The microprocessor performs a real-time process to several pulse wave amplitudes detected by the pulse wave detector (3) during the course of slow increase from zero and the corresponding pressures of the pressurized cuff to determine a systolic pressure; and the microprocessor performs a real-time process to several pulse delay periods which are the delay periods between the pulse waves and the corresponding pressure AC signals during the course of variable delay periods to relatively constant delay periods and the corresponding pressures of the pressurized cuff to determine a diastolic pressure. Possible and inevitable errors caused by discontinuity of heartbeats can be avoided by a conversion from discontinuous events to continuous measurements. The systolic pressure and the diastolic pressure of blood pressure can be measured accurately and non-invasively.