Medical low-cost automatic oscillometric blood pressure measurement solutions

Oscillometric blood pressure measuring device must be able to work with 3V battery, and the need to provide enough memory and processing power to run blood pressure algorithm, because these sphygmomanometer is oriented to the consumer market, the low cost is important.

With which devices can achieve low-cost requirements? this article will give you guidance in this regard.

Use automatic oscillometric blood pressure meter you can measure the blood pressure in the Office or home.

Wrist blood pressure lower than systolic blood pressure, blood flow through the artery, when started, the arterial wall start vibrating, these vibrations wrist blood pressure changes or minor fluctuations. This blood pressure fluctuation is systolic blood pressure. Diastolic pressure measurement involves complex, usually proprietary algorithm that can determine the slope of the blood pressure fluctuations. Oscillometric blood pressure measuring device must be able to work with 3V battery, and the need to provide enough memory and processing power to run blood pressure algorithm, because these sphygmomanometer is oriented to the consumer market, the low cost is important.

Solution

ADI's high-performance IC can meet the demand for blood pressure monitor.

AD627 is an integrated micropower instrumentation amplifier, with rail-to-rail output swing.

It has excellent AC and DC, maximum operating current of only 85 A μ.

ADuC7022 is an analog I/O, ARM7TDMI 12-bit microcontroller, low power consumption, power supply voltage: 3 V.

It supports memory-intensive and processing-intensive algorithms.

AD8617 micropower, CMOS, rail-to-rail, input/output operational amplifier with low offset voltage, low input voltage and low current noise, and other characteristics.

It supports single-supply operation. The design of the blood pressure measurement, AD8617 can played on pulsatility four pole bandpass filter.

ADuM2402 is a four-channel digital isolators, with optocoupler compared to traditional devices, it has excellent performance characteristics.

Because it does not use LED and photodiode, iCoupler devices no longer has the optocoupler related design difficulty, including current transfer ratio is uncertain, nonlinear transfer functions, the effect of temperature and life challenges. ICoupler Digital device has a simple interface and stable performance characteristics. ICoupler device eliminates the need for external drives, and other discrete devices. In addition, you can compare the data rate of the signal, the power consumption of devices iCoupler only optocoupler 1/10 to 1/6.

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