Blood Pressure Measurement Using Device with Piezoelectric Sensor

A blood pressure measurement device comprising:

• a cuff comprising an inflatable bladder;
• a processing unit configured to:
• cause the inflatable bladder to inflate to an inflated state, the cuff configured to occlude an artery of a user when the inflatable bladder is in the inflated state;
• and
• cause the inflatable bladder to deflate during a deflation sequence;
• and
• a differential polyvinylidene fluoride (PVDF) sensor coupled to the inflatable bladder and configured to output a signal during the deflation sequence, the signal corresponding to blood flow through the artery;
• wherein:
• the processing unit is further configured to:
• filter the signal to isolate an oscillometric waveform and a biological waveform;
• analyze the oscillometric waveform to determine at least one of a systolic blood pressure, a diastolic blood pressure, or a mean arterial pressure;
• and
• analyze the biological waveform to determine a biological parameter of the user.

A blood pressure measurement device comprising:

• a bladder section comprising:
• a first flexible layer;
• and
• a second flexible layer coupled to the first flexible layer to form an inflatable interior volume between the first flexible layer and the second flexible layer;
• a first differential polyvinylidene fluoride (PVDF) sensor coupled to the first flexible layer and configured to output a first signal corresponding to blood flow through an arm of a user;
• a second differential PVDF sensor coupled to the first flexible layer to output a second signal corresponding to the blood flow through the arm of the user;
• and
• a processing unit operably coupled to the first and second differential PVDF sensors and configured to determine a blood pressure of the user using the first signal and the second signal.