Acquisition of arterial response process for pulsating blood flow and its blood pressure measuring method

A blood pressure measuring apparatus comprising:

• a cuff having tubes therein for wrapping around and applying pressure to an artery;
• a pressurizing unit to inflate the cuff;
• a bleeding valve to deflate the cuff;
• a pressure transducer to detect fluctuating pressure within the cuff;
• a displacement transducer to detect displacement of the arterial wall;
• a velocity transducer to detect the velocity of the wall displacement;
• data processing means coupled to the transducers for determining the acceleration component of the arterial wall's displacement and, from the acceleration, determining changes in displacement velocity over time;
• and
• control means for controlling the pressurizing unit, bleeding valve and data processing means.

A method of measuring dynamic parameters of arterial wall motion against decreasing pressure of a pressurized cuff, comprising;

• squeezing an artery by pressurizing the cuff, the artery having a stretchable wall that is displaced in response to a pulsating blood flow through the artery;
• deflating the cuff to decrease the cuff pressure;
• determining acceleration of the arterial wall's displacement as the wall stretches and contracts;
• and
• from the acceleration, determining changes in velocity of the arterial wall's displacement over time.