Patent ID: 9649070
Date: 2017-05-16
CPC Classifications: A61B

Claim:
1. A method for suppressing cardiogenic oscillations in a transthoracic electrical impedance signal, wherein a signal processing apparatus comprising at least one processor and at least one memory storing program instructions, when executed by the at least one processor, performs the steps of: providing a composite signal S being a transthoracic electrical impedance signal Z, comprising an oscillatory signal S high pass filtering the composite signal S with a high pass filter to produce an estimate of the oscillatory signal Ŝ defining a first bin associated with said first state and a second bin associated with said second state; defining the portions of the estimate of the modulating signal Ŝ assigning the first bin for said first oscillations associated with the defined first state and the second bin for said second oscillations associated with the defined second state; forming a first average waveform for said first oscillations in said first bin and a second average waveform for said second oscillations in said second bin; and using said first and second average waveforms for suppressing said oscillatory signal S