Clinical-grade AFE measures four vital signs

September 21, 2021 // By Jean-Pierre Joosting
Clinical-grade AFE measures four vital signs
Ideal for remote patient monitoring devices, the MAX86178 features synchronized measurement of electrocardiogram (ECG), heart rate, SpO₂ and respiration rate.

The MAX86178 from Analog Devices simplifies the design of wearable remote patient monitoring (RPM) devices by measuring four vital signs with one triple-system vital signs analog front end (AFE). This single-chip AFE integrates three measurement systems (optical, ECG and bio-impedance) to obtain four common vital signs: electrocardiogram (ECG or EKG), heart rate (ECG or optical PPG), blood-oxygen saturation (SpO₂) and respiration rate (using BioZ). The MAX86178 enables synchronized optical PPG and ECG timing for derived health metrics.

Medical device designers are eager to reduce annual healthcare-related expenditures by replacing office-based health monitoring systems with smaller, lower power, wireless devices worn discreetly and continuously in the home or office. With three clinical-grade subsystems integrated into one IC, the MAX86178 triple system AFE replaces discrete implementations by integrating an optical PPG sub-system to measure heart rate and SpO₂, a single lead ECG sub-system, as well as a biopotential and bioimpedance (BioZ) sub-system to measure respiration rate. It permits small vital signs devices by fitting those multiple functions into a 2.6- x 2.8-mm package.

In addition, next-generation wearable RPMs need to operate at low power to permit smaller batteries or extend battery life to allow more convenient charging requirements. To enable ultra-low power features, the MAX86178 provides each subsystem with configurable options to optimize battery life for specific use cases.

Clinical-Grade AFE from Analog Devices measures four vital signs for remote patient monitoring devices.

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