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A Novel Dual-mode Anti-interference Pulse Oximetry with iMAT Algorithm


Pulse Oximetry, as a non-invasive method of monitoring blood oxygenation and detecting hypoxia, has been extensively used in operating room, PACU, CCU, emergency department, neonatal care unit and home care.

There are many factors which limit the performance of pulse oximetry and two of the most common are high motion (such as shivering, tremor of patient) and low perfusion at the area of measurement. Both conditions will add interference to the signal acquired by the sensor and reduce the accuracy of the result.

The use of specifically anti-motion technique and signal processing algorithm iMATTM can greatly eliminate the interference under those harsh conditions.

This anti-interference technique from EDAN addresses this issue by the following two aspects:

1. A high SNR circuit with low-noise devices is designed for the acquisition of weak signal under low perfusion.

2. A unique signal processing algorithm iMATTM which takes the advantage of the signal characteristics under high motion or low perfusion to improve the accuracy and stability of the measurement.

The algorithm iMATTM uses special filtering techniques to reduce the noise caused by motion as well as from other sources and amplifies the pulse oximetry signal. The blood oxygen saturation value is obtained by combining both frequency domain and time domain signal processing techniques.

The merits of one of the signal processing techniques is that the interferences from motion or other sources are greatly reduced, thus the measurement is more accurate and stable. The rate of false alarm decreases as well, reducing the waste of labor force of caregivers.

The other signal processing technique maintains an adequate level of sensitivity and fast response to changes of oxygen saturation so that caregivers can take necessary actions in time.

The above dual-mode anti-interference pulse oximetry technology guarantees the reliable, accurate and sensitive measurement of blood oxygen saturation under conditions of high motion and low perfusion.

Besides, in order to meet the needs of home care and out-patient examination, special fast measuring technique which expedites the analysis and processing of the signal can also be used to offer a quick result, making the measuring process more convenient and less time-consuming. It also implies the possibility of expanding the use of pulse oximetry from continuous monitoring to a wider variety of applications.