A3: Wearable Devices

FACTORS INFLUENCING PULSE PRESSURE IN RADIAL ARTERY TONOMETRY: A DEVICE DESIGN PERSPECTIVE

Sitikantha Roy, Mohd. Ikbal B. Choudhury, Pranjal Singh, Rajnish Juneja, Anamika Prasad

Indian Institute of Technology Delhi, India

The technology for acquiring pressure pulses from a peripheral artery using the principle of applanation tonometry has been around for a while now. Under stable conditions, arterial tonometry can faithfully give the right pulse waveforms that can be calibrated to a blood pressure (BP). Quite a number of products have come up in the market with varying degrees of accuracy and use case. This is because the focus now has started to shift from discreet two-value BP readings to pulse waveforms, as the latter is more representative of a number of hemodynamic and physiological parameters.  However most of the available devices are very expensive and used only in physiology labs for the purpose of research. Moreover the devices are like black-boxes as neither the clinicians can calibrate them with a gold standard in case of spurious readings, nor the engineers can modify them to improve efficacy.  Therefore there is need for a detailed study to identify factors influencing tonometric readings from a device development perspective. We have developed a device supported by detailed underlying computational analysis that enables measurement of pressure pulses in the radial artery using off-the-shelf tactile-based pressure sensor. In this work, we present some of the factors affecting pulse pressure reading from radial artery in the context of device design.  Specifically, we evaluate factors such as sensor position on the artery, hold-down pressure and orientation, extension of the wrist, and material and geometry variability and its relationship with specific device design. Also the factors influencing calibration of pressure pulses to the BP are identified and discussed
 

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