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Electrical and Wave

Automatic-gain-control-and-method-for-enabling-detection-of-low-and-high-amplitude-depolarization-activation-waves-of-the-heart-and-atrial-defibrillator-utilizing-the-same

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Automatic gain control and method for enabling detection of low and high amplitude depolarization activation waves of the heart and atrial defibrillator utilizing the same

Details

Inventors: White, Harley; Bocek, Joseph M.;
Assignee: InControl, Inc. (Redmond, WA)
Primary Examiner: Kamm; William E.
Assistant Examiner: Parker; Marianne
Attorney, Agent or Firm: Gray, Jr.; Richard O.

An apparatus reliably detects a depolarization activation wave of the heart. The apparatus includes a sensor in electrical contact with the heart for sensing electrical activity of the heart and including an amplifier for amplifying the sensed electrical activity according to a variable gain and providing a signal corresponding to the depolarization activation wave. The apparatus further includes an output circuit coupled to the sensor for producing an electrical output corresponding to the depolarization activation wave sensed by the sensor when the signal exceeds a threshold. The apparatus still further includes a control circuit coupled to the sensor and the output circuit for varying at least one of the gain and the threshold to maintain a predetermined sense margin between the sensed electrical activity and the gain and the threshold.

DETAILED DESCRIPTION The present invention therefore provides a method for reliably detecting a depolarization activation wave of the heart.
The method includes the steps of providing a detection system having a variable sensitivity including a variable gain and a variable threshold.
The method further includes the steps of sensing activity of the heart in at least one chamber of the heart and producing an input signal corresponding to the sensed activity, the input signal having an input amplitude.
The method further includes the steps of amplifying the input signal according to the gain to produce an amplified input signal having an amplified input amplitude and producing an output when the amplified input signal exceeds the threshold, the output indicating the occurrence of the depolarization activation wave.
The method still further includes the steps of varying at least one of the gain and the threshold to maintain a predetermined sense margin between the input amplitude and the gain and the threshold.
The present invention further provides an apparatus for reliably detecting a depolarization activation wave of the heart.
The apparatus includes sensing means in electrical contact with the heart for sensing electrical activity of the heart and including amplifying means for amplifying the sensed electrical activity according to a variable gain and providing a signal corresponding to the depolarization activation wave.
The apparatus further includes output means coupled to the sensing means for producing an electrical output corresponding to the depolarization activation wave sensed by the sensing means when the signal exceeds a threshold.
The apparatus still further includes control means coupled to the sensing means and the output means for varying at least one of the gain and the threshold to maintain a predetermined sense margin between the sensed electrical activity and the gain and the threshold.
The present invention still further provides an implantable atrial defibrillator for reliably detecting a depolarization activation wave of the heart and applying cardioverting electrical energy to the atria of the heart in synchronism with the detected depolarization activation wave

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