Clinical validation of LTMS-S: A wearable system for vital signs monitoring

Abstract

LTMS-S is a new wearable system for the monitoring of several physiological signals--including a two-lead electrocardiogram (ECG)--and parameters, such as the heart rate, the breathing rate, the peripheral oxygen saturation (SpO2), the core body temperature (CBT), and the physical activity. All signals are measured using only three sensors embedded within a vest. The sensors are standalone with their own rechargeable battery, memory, wireless communication and with an autonomy exceeding 24 hours. This paper presents the results of the clinical validation of the LTMS-S system.

New biosensors and wearables for cardiorespiratory telemonitoring

“…SpO2 (arterial oxygen saturation) is normally measured at the fingertip, but recent experiments [10] suggest that it can be also captured from the chest, at least under certain conditions. Skin temperature is easy to monitor but has limited physiological meaning.…”

“…Skin temperature is easy to monitor but has limited physiological meaning. CBT (core body temperature) is more difficult to obtain in an unobtrusive way, but some developments show that it might be possible to indirectly sense it from the chest surface [10].…”

“…However, only one ECG lead and one impedance channel could be measured this way. Nevertheless, the quality of the ECG and impedance was proven excellent despite the absence of shielded cables and additional signals such as CBT and SpO2 were added [10]. A first step towards more ECG leads was achieved with the synchronization of additional measuring sensors [14].…”

“…The reference sensor is bigger in its present implementation (dia. 65 × 19mm) and looks like the sensor S in [10], because like the latter, it measures SpO2 and acceleration. Moreover, the reference sensor also processes the ECG and impedance signals to extract relevant information such as heart and respiration rates, as well as activity and posture classes.…”

Understanding the human performance envelope using electrophysiological measures from wearable technology

“…In this research, we capture physiological signals through exploitation of a newly developed wearable technology developed by the Swiss company CSEM SA (Chételat et al 2015) shown in Fig. 1.…”