Method of estimating the actual ECG of a patient during CPR
First Claim
1. A method of estimating an actual ECG signal of a patient while performing chest compressions with an automatic chest compressions device, wherein the method comprises the steps of:
- providing an ECG sensor capable of measuring an ECG signal of the patient, said ECG sensor producing a measured ECG signal having an actual component and a noise component;
providing an automatic chest compression device disposed to provide chest compressions to the patient, said chest compression device having a load sensor capable of determining the presence of a chest compression when the load sensed by the load sensor exceeds a predetermined value, said load sensor producing a compression signal corresponding the presence a chest compression;
performing compressions;
providing the measured ECG signal to a system identifier;
providing the compression signal to the system identifier;
estimating the noise component of the measured ECG signal with the system identifier by processing the measured ECG signal and the compression signal;
providing the measured ECG signal and the estimated noise component of the measured ECG signal to a means for combining signals;
calculating the estimated actual ECG with the means for combining signals by combining the measured ECG signal and the noise component of the measured ECG signal.
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Accused Products
Abstract
A method of processing a raw acceleration signal, measured by an accelerometer-based compression monitor, to produce an accurate and precise estimated actual depth of chest compressions. The raw acceleration signal is filtered during integration and then a moving average of past starting points estimates the actual current starting point. An estimated actual peak of the compression is then determined in a similar fashion. The estimated actual starting point is subtracted from the estimated actual peak to calculate the estimated actual depth of chest compressions. In addition, one or more reference sensors (such as an ECG noise sensor) may be used to help establish the starting points of compressions. The reference sensors may be used, either alone or in combination with other signal processing techniques, to enhance the accuracy and precision of the estimated actual depth of compressions.
60 Citations
36 Claims
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1. A method of estimating an actual ECG signal of a patient while performing chest compressions with an automatic chest compressions device, wherein the method comprises the steps of:
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providing an ECG sensor capable of measuring an ECG signal of the patient, said ECG sensor producing a measured ECG signal having an actual component and a noise component;
providing an automatic chest compression device disposed to provide chest compressions to the patient, said chest compression device having a load sensor capable of determining the presence of a chest compression when the load sensed by the load sensor exceeds a predetermined value, said load sensor producing a compression signal corresponding the presence a chest compression;
performing compressions;
providing the measured ECG signal to a system identifier;
providing the compression signal to the system identifier;
estimating the noise component of the measured ECG signal with the system identifier by processing the measured ECG signal and the compression signal;
providing the measured ECG signal and the estimated noise component of the measured ECG signal to a means for combining signals;
calculating the estimated actual ECG with the means for combining signals by combining the measured ECG signal and the noise component of the measured ECG signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of estimating an actual ECG signal of a patient while performing chest compressions with an automatic chest compressions device, wherein the method comprises the steps of:
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providing an ECG sensor capable of measuring an ECG signal of the patient, said ECG sensor producing a measured ECG signal having an actual component and a noise component;
providing an automatic chest compression device disposed to provide chest compressions to the patient, said chest compression device having an encoder capable of determining the presence of a chest compression, said encoder producing a compression signal corresponding the presence a chest compression;
performing compressions;
providing the measured ECG signal to a system identifier;
providing the compression signal to the system identifier;
estimating the noise component of the measured ECG signal with the system identifier by processing the measured ECG signal and the compression signal;
providing the measured ECG signal and the estimated noise component of the measured ECG signal to a means for combining signals;
calculating the estimated actual ECG with the means for combining signals by combining the measured ECG signal and the noise component of the measured ECG signal. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A method of estimating an actual ECG signal of a patient while performing chest compressions with an automatic chest compressions device, wherein the method comprises the steps of:
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providing an ECG sensor capable of measuring an ECG signal of the patient, said ECG sensor producing a measured ECG signal having an actual component and a noise component;
providing an automatic chest compression device disposed to provide chest compressions to the patient, said chest compression device having an accelerometer capable of determining the presence of a chest compression, said accelerometer producing a compression signal corresponding the presence a chest compression;
performing compressions;
providing the measured ECG signal to a system identifier;
providing the compression signal to the system identifier;
estimating the noise component of the measured ECG signal with the system identifier by processing the measured ECG signal and the compression signal;
providing the measured ECG signal and the estimated noise component of the measured ECG signal to a means for combining signals;
calculating the estimated actual ECG with the means for combining signals by combining the measured ECG signal and the noise component of the measured ECG signal. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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Specification