Pacemaker with morphological filtering of sensed cardiac signals

Details Pacemaker with morphological filtering of sensed cardiac signals Pacemaker with morphological filtering of sensed cardiac signals

1997-03-04

1998-10-06

Getzow, Scott M.

Surgery: light, thermal, and electrical application

Light, thermal, and electrical application

Electrical therapeutic systems

A61N 1362

Patent

active

058171339

ABSTRACT:
A system and method are provided, particularly useful for an implantable cardiac pacemaker, for morphological filtering of sensed signals to reliably and accurately identify one or more specified wave portions of the sensed signals. In a first pacemaker embodiment, morphological filtering is done on the sensed atrial signal, whereby the P-wave peak is discriminated out, with the resulting signal minus the P-wave peak being then subtracted from the inputted atrial signal to provide the atrial peak, thereby effectively eliminating sensing of FFR-wave portions. By setting the morphological filter length to correspond to about the duration of the P-wave peak, or just slightly larger, and by adjusting sampling frequency to correspond to cardiac rate variations, there is provided optimized filtering consistent with low power consumption in an implantable device. In other embodiments, FFR-waves, T-waves, VT, SVT and sinus tachycardia are identified by using templates matched to the wave to be identified. The invention can be performed with either analog or digital embodiments, analog embodiments providing for lower power consumption.

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"Impulse Noise Suppression and Background Normalization of Electrocardiogram Signals Using Morphological Operators" Chu, et al. IEEE Transactions on Biomedical Engineering, vol. 36, No. 2, Feb. 1989.
"An Approach to QRS Complex Detection Using Mathematical Morphology" Trahanias, PE, IEEE Transactions on Biomedical Engineering, vol. 40., No. 2, Feb. 1993.

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