- The number of hypertensive people is increasing, and most of the existing sphygmomanometers in the market cannot meet the needs of users.
Micro medical blood pressure detection equipment, fast, accurate,
convenient development.
The BP Monitor Solution consists of a MEMS piezoelectric pump, a
variable modulus tactile sensing wrist cuff, a high-modulus and highly
flexible fiber watchband, and a highly precise and generalized AI BP
algorithm. In principle, it uses the oscillometric boosting method and
has more faster and more accurate blood pressure monitoring. Key
innovations include:
1) By using MEMS pump-valve integrated devices as an inflation source
and control valve, it significantly reduces the size of conventional
blood pressure monitors, enabling the integration of blood pressure
measurement into a typical wristwatch-sized device.
2) For achieving further accuracy improvement, use multi-sensors to
collect raw data. Pulse wave is sampled bymulti-layered spring-type
tactile sensing wrist cuff, air pressure and contact pressure are
collected by dual data curve simultaneously.
3) To solve the specificity of narrow balloon sensing component, AI BP
algorithm is used to achieve non-linear correction of wrist cuff
pressure and artery pressure. It has strong population adaptability
and universality, and can be updated by OTA.
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After BP measurement starts,sampling control phase and signal
processing phase come in sequence:
1) Sampling control phase
Drive the MEMS micropump to infalte the TPU spring-type narrow wrist
cuff at a constant rate, and the radial artery is continuously
compressed under the constraints of the inelastic watchband. In this
process, the device senses the pulsation of the pulse wave and obtains
the air pressure curve; at the same time, thecontact-sensing flexible
sensor on the outer wall of the cuff continuously collects the
pressure between the outer wall of the cuff and the skin of the
wrist.When the amp litude of the pulse wave signal is lower than the
threshold, the MEMS piezoelectric pump stops, and the membrane valve
in the MEMS pump opens, deflating instantly.
2) Signal processing stage
Based on the air pressure curve obtained above, Butterworth filtering
and FIR filtering are performed to obtain the pulse fluctuation
pressure curve and air pressure static pressure curve respectively,
and then the variable amplitude system is usedthe mathematical method,
the original diastolic blood pressure and systolic blood pressure can
be obtained by mapping; the pulse can be obtained by performing pulse
wave statistics based on the dynamic pressure curve. Due to the narrow
cuff effect and individual wearing tightness,consistently, the blood
pressure algorithm constructed based on the dynamic pressure curve and
the contact pressure curve realizes the correction of the individual's
true systolic blood pressure and diastolic blood pressure, and finally
displays the measurement results.
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