Method and system for acquiring biosignals in the presence of HF interference
Inventors
SALIGA, THOMAS V • Bibian, Stéphane • Zikov, Tatjana
Assignees
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Publication Number
US-11337656-B1
Publication Date
2022-05-24
Expiration Date
Abstract
The present invention, herein is a method and apparatus that significantly limits the effect of high frequency (“HF”) interferences on acquired electro-physiological signals, such as the EEG and EMG. Preferably, this method comprises of two separate electronic circuitries and steps or electronics for processing the signals. One circuit is used to block the transmission of HF interferences to the instrumentation amplifiers. It is comprised of a front-end active filter, a low frequency electromagnetic interference (“EMI”) shield, and an isolation barrier interface which isolates the patient from earth ground. The second circuit is used to measure the difference in potential between the two isolated sides of the isolation barrier. This so-called “cross-barrier” voltage is directly representative of the interference level that the instrumentation amplifier is subjected to. This circuit is used to confirm that the acquired signals are not corrupted by the interference.
Core Innovation
The invention acquires signals from a subject in the presence of high frequency (HF) electrical interference. At least 2 electrodes are attached to the subject, and signals are acquired using amplification circuitry that includes at least one input filter for HF electrical interference rejection and an isolation barrier. A quantitative measure of a level of HF electrical interference is obtained and provided with the acquired signals to a processor.
The quantitative measure is used as a metric of residual HF interference by measuring HF electrical interference across the isolation barrier and transmitting the measured HF electrical interference level together with the acquired signals. The measured HF electrical interference level is obtained in association with the isolation barrier so that the processor receives both the biosignal data and the interference level.
In the apparatus implementation, multistage amplification circuitry and an optimized low frequency shield are included, and power is transmitted via an optimized transformer while data is transmitted via at least one data coil. The amplification circuitry is configured to measure the level of HF electrical interference across the isolation barrier and transmit the acquired signals and measured HF electrical interference level to a processor.
Claims Coverage
The partial content includes two independent claims. Each independent claim centers on acquiring biosignals under HF electrical interference while measuring the HF interference level across an isolation barrier and transmitting both the biosignals and the measured HF interference level to a processor.
Electrode-based signal acquisition with HF rejection and quantitative interference measurement
Attaching at least 2 electrodes to a subject; acquiring signals using amplification circuitry comprising at least one input filter for HF electrical interference rejection and an isolation barrier; obtaining a quantitative measure of a level of HF electrical interference; and transmitting the signals and measured HF electrical interference level to a processor.
HF-interference-rejection apparatus with isolated HF interference measurement across an isolation barrier
Providing at least 2 electrodes for acquiring signals; providing amplification circuitry for HF electrical interference rejection with at least one active input filter, multistage amplification circuitry, an optimized low frequency shield, and an isolation barrier where power is transmitted via an optimized transformer and data is transmitted via at least one data coil; measuring the level of HF electrical interference across the isolation barrier; and transmitting the acquired signals and measured HF electrical interference level to a processor.
Both independent claims require acquiring signals under HF electrical interference using amplification circuitry with HF rejection and an isolation barrier, then obtaining and transmitting a quantitative measure of HF electrical interference across that isolation barrier to a processor together with the acquired signals.
Stated Advantages
Documented Applications
No documented applications found
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