Wireless health monitoring in the setting of X-ray, magnetic resonance imaging and other sources of electromagnetic interference
First Claim
1. A system adapted for physiological monitoring of an individual'"'"'s health data in the presence of variable electromagnetic interference (EMI), including EMI generated by gradient magnetic field (GMF-interference), whose frequency spectrum often overlaps with that of an individual'"'"'s physiological signals, said system comprising:
- at least one acquisition module that includes at least two sensors adapted to be placed onto an individual'"'"'s skin for collecting at least one physiological signal by substantially continuous monitoring said health data;
at least one communication module that includes at least one transmitter for receiving and transmitting said at least one physiological signal; and
at least one processing module for receiving said at least one physiological signal from said communication module and processing said at least one physiological signal, said module including;
at least one GMF-detector for detection of GMF interference on a continuous, time-domain basis, including at least parameter selected GMF amplitude, derivative, waveform, the beginning and ending of GMF interference, by extracting at least one feature of said physiological signal on a substantially continuous basis and comparing said at least one feature with thresholds to detect at least one part of the signal that exceeds said thresholds, wherein threshold values are represented by at least one at least one value selected from constant value, automatically adapted value, and manually adapted value;
at least one filter for filtering said GMF interference from said physiological signal using at least one signal processing operation selected from bitwise shift operation, voltage division, voltage multiplication, pattern recognition, template matching and wavelet-based filtering tailored to the time-domain characteristics of patterns of the GMF interference; and
at least one section for processing said physiological signal after removal of GMF interference by performing at least one signal processing operation selected from low-pass filtering, high-pass filtering, band-pass filtering, signal averaging, reconstruction and singular value decomposition.
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Accused Products
Abstract
This multipurpose, modular system provides diagnostic-quality, wireless, multichannel monitoring in diverse settings, including interventional procedures guided by X-ray and MRI, with variable electromagnetic interference (EMI) and eliminates the need for multiple detachments/reattachments of patient cables when the patient is moved from one room/procedure to another. The system includes: 1) multiple filterbanks (filtering procedures) for recording both diagnostic-quality (broad-band) signals in the absence of EMI and narrow-band signals in the presence of EMI, with subsequent reconstruction of diagnostic-quality signals from the narrow-band signals; 2) filtering of EMI, using a priori and adaptive criteria about differences between the EMI and physiological signals'"'"' characteristics; 3) filtering of the magneto-hydrodynamic effect, using physiological measurements at different distances from the magnet (i.e., at different strengths of magnetic field) and changes in blood flow and blood pressure; and 4) multiple wireless transmitters for increasing reliability and speed (throughput) of the wireless data transmission.
27 Citations
19 Claims
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1. A system adapted for physiological monitoring of an individual'"'"'s health data in the presence of variable electromagnetic interference (EMI), including EMI generated by gradient magnetic field (GMF-interference), whose frequency spectrum often overlaps with that of an individual'"'"'s physiological signals, said system comprising:
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at least one acquisition module that includes at least two sensors adapted to be placed onto an individual'"'"'s skin for collecting at least one physiological signal by substantially continuous monitoring said health data; at least one communication module that includes at least one transmitter for receiving and transmitting said at least one physiological signal; and at least one processing module for receiving said at least one physiological signal from said communication module and processing said at least one physiological signal, said module including; at least one GMF-detector for detection of GMF interference on a continuous, time-domain basis, including at least parameter selected GMF amplitude, derivative, waveform, the beginning and ending of GMF interference, by extracting at least one feature of said physiological signal on a substantially continuous basis and comparing said at least one feature with thresholds to detect at least one part of the signal that exceeds said thresholds, wherein threshold values are represented by at least one at least one value selected from constant value, automatically adapted value, and manually adapted value; at least one filter for filtering said GMF interference from said physiological signal using at least one signal processing operation selected from bitwise shift operation, voltage division, voltage multiplication, pattern recognition, template matching and wavelet-based filtering tailored to the time-domain characteristics of patterns of the GMF interference; and at least one section for processing said physiological signal after removal of GMF interference by performing at least one signal processing operation selected from low-pass filtering, high-pass filtering, band-pass filtering, signal averaging, reconstruction and singular value decomposition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system adapted for physiological monitoring of an individual'"'"'s health data in the presence of variable electromagnetic interference (EMI), including EMI generated by gradient magnetic field (GMF-interference), whose frequency spectrum often overlaps with that of an individual'"'"'s physiological signals, said system comprising:
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at least one acquisition module that includes at least two sensors adapted to be placed onto an individual'"'"'s skin for collecting at least two physiological signals of an individual'"'"'s health data including at least one ECG signal by substantially continuous monitoring said health data; at least one communication module for receiving and transmitting wirelessly said at least two signals of an individual'"'"'s health data, using at least two wireless transmitters located within a single transmission module to improve at least one parameter selected from transmission speed and reliability by providing at least one type of operation selected from synchronous, asynchronous, parallel and independent transmission; and at least one processing module for receiving said at least two signals from said communication module and processing said at least two signals, said module including; at least one GMF-detector for detection of GMF interference on a continuous, time-domain basis, including at least parameter selected GMF amplitude, derivative, waveform, the beginning and ending of GMF interference, by extracting at least one feature of said signals on a substantially continuous basis and comparing said at least one feature with thresholds to detect at least one part of the signals that exceeds said thresholds, wherein threshold values are represented by at least one at least one value selected from constant value, automatically adapted value, and manually adapted value; parallel filter banks for filtering said GMF interference from said physiological signals using at least one signal processing operation selected from bitwise shift operation, voltage division, voltage multiplication, pattern recognition, template matching and wavelet-based filtering tailored to the time-domain characteristics of patterns of the GMF interference; and at least one section for processing said physiological signals after removal of GMF interference, which performs at least one signal processing operation selected from low-pass filtering, high-pass filtering, band-pass filtering, signal averaging, reconstruction and singular value decomposition. - View Dependent Claims (10, 11, 12, 13)
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14. A method adapted for physiological monitoring physiological data of an individual'"'"'s health data in the presence of variable electromagnetic interference (EMI), including EMI generated by gradient magnetic field (GMF-interference), whose frequency spectrum often overlaps with physiological signals, said method comprising:
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collecting at least one physiological signal of an individual'"'"'s health data by substantially continuous monitoring said health data; receiving and transmitting said at least one physiological signal to a processing unit; and conditioning said at least one physiological signal in said processing said at least one signal by detecting GMF-interference on a continuous, time-domain basis, including at least one parameter selected from GMF amplitude, derivative, waveform, the beginning and ending of GMF-interference, by extracting at least one feature of said signal on a substantially continuous basis and comparing said at least one feature with thresholds to detect at least one feature of the signal that exceeds said thresholds, wherein threshold values are represented by at least one value selected from constant value, automatically adapted value, and manually adapted value, filtering said GMF from said at least one physiological signal using at least one signal processing operation selected from bitwise shift operations, voltage division, voltage multiplication, pattern recognition, template matching and wavelet-based filtering tailored to the time-domain characteristics and/or patterns of the GMF signals; and processing said physiological signal after removal of GMF, which performs at least one of signal processing operation selected from low-pass filtering, high-pass filtering, band-pass filtering, signal averaging, reconstruction and singular value decomposition. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification