The device uses single BLE System-on-Chip to
process the algorithm of blood pressure measurement and data
transmission. Through the newest Bluetooth Low Energy
technology, device can send measured results to the smartphone.
Therefore, users can get the information of systolic blood
pressure, diastolic blood pressure and pulse rate on the
smartphone. Besides, the format of data transmission packet is
based on the standard Blood Pressure Profile specification from
Bluetooth SIG. The homemade blood pressure monitor has high
compatibility to communication with other devices using the
same Bluetooth profile. The accuracy of pulse rate and blood
pressures are verified through the CuffLink simulator. The
accuracy of pulse rate is -1.13 ± 0.52 beats, the accuracy of
systolic blood pressure is 0.69 ± 1.63 mmHg, and the accuracy of
diastolic blood pressure is 0.20 ± 1.02 mmHg. In clinical trials,
the systolic blood pressure average difference between our
method and auscultatory method is 2.66 ± 2.71 mmHg. The
diastolic blood pressure average difference between our method
and auscultatory method is 3.42 ± 4.42 mmHg. As a result, this
device has high accuracy for measuring blood pressure and pulse
rate