Non-Contact Breathing and Pulse Measurement
Today, the monitoring and evaluation of vital functions, especially pulse and breathing rates, are part of the clinical routine. In certain cases (e.g. during dialysis, after a heart attack, or to prevent Sudden Infant Death Syndrome), long-term home monitoring is also necessary. However, the current use of the related ECG-electrodes, PPG-clips or flow sensors is associated with several side-effects like skin irritation, contact problems or large energy requirements. Due to the mechanical work performed by the heart and lungs, well- conducting and poor-conducting fluid volumes (blood or air) pass through the body, which causes a measurable change in the body’s electrical impedance distribution. Through magnetic bioimpedance measurements, which use inductive eddy currents, a non-contact determination of this resistance distribution is possible.
- Very small measurement signals
- Signal disturbance sensitive to movements of surrounding metal as well as to movement or deformation of the sensor
- Disturbance to other measuring devices
- Problematic integration
Figure 1 illustrates an early prototype of a single- channel sensor (red), that can be used for the monitoring of heart activity.
In the scope of the project , the following goals will be pursued:
- Development of measurement and testing protocols
- Determination of suitable measurement sensors and positions
- Wearable integration in clothing/accessories
- Integration in beds or seating structures
- Non-contact monitoring of premature babies in incubators