Contactless Bed Sensors

Murata
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Contactless Bed sensors

The new bed sensor technology is based on the Ballistocardiographic (BCG) principle. When the heart pumps blood there is a recoil effect to the opposite direction. This means that when e.g. lying on a bed, the entire bed will be subject to micro movements due to the blood flow. We use an ultra-sensitive Murata accelerometer to capture this signal. A microcontroller with a specially made algorithms are able to extract heart rate and many other vital signs from the signal.

Contactless bed sensors

The products are component parts of equipment
    ◾Opens new possibilities in patient monitoring and elderly care in hospitals, assisted living and even at homes
    ◾Embedded heart and respiration rate and beat-to-beat time signal processing enabling patient monitoring from bed occupancy to condition quality Analysis

The BCG technology is available in 2 different formats/products:
    SCA11H node

    ◾A complete BCG-based sensing component that comprises the sensor, microcontroller and a Wi-Fi Transceiver

    ◾Targeted for software solution- and service providers and OEM system Integrators
   SCA10H module

    ◾Solderable PCB module component comprising the sensor and microcontroller
    ◾Ideal for equipment manufacturers

The BCG module/node outputs vital signs and bed occupancy information such as:
    ◾Heart rate
    ◾Respiration rate
    ◾Heart rate variability (correlates to stress level)
    ◾Relative stroke volume (how much blood the heart pumps)
    ◾Bed status indicator (is the bed empty, is patient in bed, is patient moving in bed)
    ◾Other information such as timestamp, signal strength etc.
 

Features

SCA10H

    ◾Contactless measurement enables continuous monitoring without disturbing the Patient
    ◾Ultra low noise and narrow noise bandwidth SCA61T 3D MEMS accelerometer andanalog signal conditioning
    ◾Embedded heart and respiration rate signal processing with 1 Hz output rate
    ◾Low power and only tens of bytes per second communication bandwidth requirement
    ◾Easy to use: UART-interface, Solderable PCB-module

SCA11H

    ◾Contactless measurement enables continuous monitoring without disturbing the Patient
    ◾Embedded heart and respiration rate signal processing with 1 Hz output rate
    ◾IEEE802.11b/g/n WLAN with easy web page configuration
    ◾Remote OTA FW upgrade capability
 

Applications

◾Hospitals, elderly care, assisted living
◾Heart and respiration rate detection
◾Cardiac output estimation
◾Bed occupancy
◾Stress and relaxation index
◾Sleep quality Monitoring