System for reducing signal disturbances in ECG, which disturbances are caused by cardio-pulmonary resuscitation
AssigneeLaerdal Medical AS
InventorsHelge Myklebust, Trygve Eftestøl, Bjørn Terje Holten, Sven Ole Aase
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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.
Claims19
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.
Dependencies are inferred from the claim text.