System for reducing signal disturbances in ECG, which disturbances are caused by cardio-pulmonary resuscitation
First Claim
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1. A system for reducing signal disturbances in ECG of a patient, which disturbances are caused by cardio-pulmonary resuscitation (CPR), the system comprising:
- a device for measuring ECG signals, a plurality of devices for measuring respective reference signals that arise as a function of CPR, where references signals represent measurements that are related to causes of signal disturbances in ECG, and a computational unit connected by separate inlets to receive respective reference and ECG signals, wherein the computational unit includes one or more digital adaptive filters which calculate an estimate of the signal disturbance as a function of the correlation between the signal disturbance caused by CPR and the reference signals to enable the computational unit to produce an output that represents the difference between the ECG signal and the estimated signal disturbance; and
the plurality of devices for measuring respective reference signals that arise as a function of CPR comprise a device for measuring a reference signal by measuring an impedance change between two electrodes placed at standard defibrillation positions and a device for measuring another reference signal by estimating a current running between the patient and a ground of the device for measuring ECG signals.
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Abstract
A system for reducing signal disturbances in ECG, which disturbances are caused by cardio-pulmonary resuscitation (CPR). The system includes a measuring device for measuring one or more signals derived from parameters such as compression depth, lung inflation etc. as a result of CPR. The parameter signals form one or more reference signals that correlate with the signal disturbances. One or more adaptive filters filter the signals out from the signal that constitutes the ECG signals so as to remove disturbances caused by CPR.
174 Citations
19 Claims
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1. A system for reducing signal disturbances in ECG of a patient, which disturbances are caused by cardio-pulmonary resuscitation (CPR), the system comprising:
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a device for measuring ECG signals, a plurality of devices for measuring respective reference signals that arise as a function of CPR, where references signals represent measurements that are related to causes of signal disturbances in ECG, and a computational unit connected by separate inlets to receive respective reference and ECG signals, wherein the computational unit includes one or more digital adaptive filters which calculate an estimate of the signal disturbance as a function of the correlation between the signal disturbance caused by CPR and the reference signals to enable the computational unit to produce an output that represents the difference between the ECG signal and the estimated signal disturbance; and
the plurality of devices for measuring respective reference signals that arise as a function of CPR comprise a device for measuring a reference signal by measuring an impedance change between two electrodes placed at standard defibrillation positions and a device for measuring another reference signal by estimating a current running between the patient and a ground of the device for measuring ECG signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
the estimated current represents a signal disturbance in ECG resulting from at least lung inflation.
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19. A system according to claim 1, wherein the impedance change represents a measurement that is related to a cause of a signal disturbance in ECG resulting from at least heart compression and lung inflation;
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the estimated current represents a signal disturbance in ECG resulting from at least lung inflation.
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Specification
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Current AssigneeLaerdal Medical AS (Laerdal Medical Corporation)
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Original AssigneeLaerdal Medical AS (Laerdal Medical Corporation)
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InventorsAase, Sven Ole, Eftestøl, Trygve, Holten, Bjørn Terje, Myklebust, Helge
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Primary Examiner(s)Jastrzab, Jeffrey R.
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Assistant Examiner(s)Oropeza, Frances P.
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Application NumberUS09/645,443Time in Patent Office1,516 DaysField of Search600/509, 607/5US Class Current600/509CPC Class CodesA61B 5/1102 BallistocardiographyA61B 5/30 Input circuits thereforA61B 5/316 Modalities, i.e. specific d...A61B 5/7207 of noise induced by motion ...A61B 5/725 using specific filters ther...
