Method and apparatus for producing a model EMG signal from a measured EMG signal
AssigneeRespironics, Inc.
InventorJaroslaw Zarychta
Life of this patent
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Abstract
A model EMG signal is produced from a measured EMG signal that includes a patient's EMG signal and ECG signal by processing the measured EMG signal to produce a logic signal that is in a first binary state in the absence of a P wave, a QRS complex and a T wave of an ECG cycle of the measured EMG signal and that is in a second binary state during at least one of the P wave, the QRS complex and the T wave of the ECG cycle. The measured EMG signal is processed to produce a first envelope signal. The model EMG signal is produced as a function of the first envelope signal when the logic signal is in the first binary state and the absence of the first envelope signal when the logic signal is in the second binary state.
Claims36
A method of producing a model EMG signal from a measured EMG signal, wherein the measured EMG signal includes a patient's EMG signal and an ECG signal, the method comprising the steps of:
- (a) processing a measured EMG signal to produce a logic signal that is (1) in a first binary state responsive to an absence of a P wave, a QRS complex and a T wave in a measured EMG signal and (2) in a second binary state responsive to a presence of at least one of the P wave, the QRS complex, and the T wave in the measured EMG signal;
- (b) processing the measured EMG signal to produce a current first envelope signal;
- and
- (c) producing a model EMG signal as a function of (1) the current first envelope signal responsive to the logic signal being in the first binary state and (2) a signal other than the current first envelope signal responsive to the logic signal being in the second binary state.
An apparatus for producing a model EMG signal from a measured EMG signal, wherein the measured EMG signal includes a patient's EMG signal and an ECG signal, the apparatus comprising:
- logic signal processing means for processing the measured EMG signal to produce a logic signal that is (1) in a first binary state responsive to an absence of a P wave, a QRS complex and a T wave in a measured EMG signal and (2) in a second binary state responsive to a presence of at least one of the P wave, the QRS complex, and the T wave in the measured EMG signal;
- first envelope processing means for processing the measured EMG signal to produce a first envelope signal;
- and
- averaging means for producing a model EMG signal as a function of (1) the current first envelope signal responsive to the logic signal being in the first binary state and (2) a signal other than the current first envelope signal responsive to the logic signal being in the second binary state.
An apparatus for producing a model EMG signal from a measured EMG signal, wherein the measured EMG signal includes a patient's EMG signal and ECG signal, the apparatus comprising:
- a logic signal processor adapted to receive the measured EMG signal to produce a logic signal that is (1) in a first binary state responsive to an absence of a P wave, a QRS complex and a T wave in a measured EMG signal and (2) in a second binary state responsive to a presence of at least one of the P wave, the QRS complex, and the T wave in the measured EMG signal;
- a first envelope processor adapted to receive such a measured EMG signal and output a first envelope signal based on the measured EMG signal;
- an averager operatively coupled to the first envelope processor, wherein the averager outputs a signal corresponding to a moving average of the first envelope signal;
- and
- a switch system operatively coupled to the logic signal processor and to at least of the first envelope processor and the averager, wherein the switch system operates based on the logic signal to at least one of (1) communicate the measured EMG signal to the first envelope processor and (2) communicate the first envelope signal to the averager responsive to the logic signal being in the first binary state so that the averager provides the model EMG signal as a function of a current first envelope signal responsive to the logic signal being in the first binary state, and wherein the switch operates based on the logic signal to at least one of (3) prevent communication of the measured EMG signal to the first envelope processor and (4) prevent communication of the first envelope signal to the averager responsive to the logic signal being in the second binary state so that the averager provides the model EMG signal as a function of a signal other than the current first envelope signal responsive to the logic signal being in the second binary state.
Dependencies are inferred from the claim text.