This leads to the important topic on the reduction of motion artifacts. In other words, these devices are required to provide an accurate estimate of the monitored vital sign under normal daily life situations. Most importantly, these devices need to have a low failure rate and must report minimal false alarms. For example, these devices need to be miniature in size, must possess a user-friendly interface and be efficient in power consumption.
In order to make wearable devices practical, a series of technical problems have to be solved. The devices can also automatically notify emergency services in critical situations. alerting them when their blood pressure is increasing to a level above a predetermined threshold. The devices can warn individuals of symptoms of deterioration, e.g. These devices are particularly important to the world's increasingly aging population, whose health conditions have to be assessed regularly or monitored continuously. Wearable medical devices are capable of continuously monitoring an individual's vital signs in real time. The results suggested that the SPWVD approach could potentially be used to reduce motion artifact on wearable pulse oximeters.
In addition, the SPWVD approach also reduces the mean absolute pulse rate error significantly (p < 0.05) from 16.4 bpm and 11.2 bpm for the WMA and FFT approaches, respectively, to 5.62 bpm. The SPWVD approach shows significant improvement (p < 0.05), as compared to traditional approaches, when subjects bend their finger or press their finger against the sensor. For each condition, 24 sets of PPG signals collected from 6 subjects, each of 30 seconds, were studied with reference to the PPG signal recorded simultaneously from the subject's other hand, which was stationary at all times. SpO2 and pulse rate were estimated from a photoplethysmographic (PPG) signal recorded when subject is in a resting position as well as in the act of performing four types of motions: horizontal and vertical movements of the hand, and bending and pressing motions of the finger. the weighted moving average (WMA) and the fast Fourier transform (FFT) approaches. The SPWVD approach is compared with two techniques currently used in this field, i.e. This study investigates the use of the smoothed psuedo Wigner-Ville distribution (SPWVD) for the reduction of motion artifacts affecting pulse oximetry. In order to incorporate the technique into a wearable device which can be used in ambulatory settings, the influence of motion artifacts on the estimated SpO2 must be reduced. The pulse oximeter, a medical device capable of measuring blood oxygen saturation (SpO2), has been shown to be a valuable device for monitoring patients in critical conditions.