“Blurred template” approach for arrhythmia detection
AssigneeMedtronic, Inc.
InventorsXin Zhang, Mark L. Brown, Xusheng Zhang, Jeffrey M. Gillberg
Life of this patent
Estimating the term…
Abstract
An implantable medical device and associated method sense cardiac signals for deriving a template representing a known EGM waveform morphology and for classifying an unknown waveform morphology. A boundary of the template, offset from the template, is computed and compared to an unknown waveform morphology for classifying the unknown waveform morphology.
Claims27
A method for use in an implantable medical device, comprising:
- sensing a cardiac signal;
- deriving a known template representing a known waveform morphology from the cardiac signal;
- computing one or more adjusted templates, each of the one or more adjusted templates computed by shifting the known template in at least one of time and amplitude;
- computing an upper boundary using the one or more adjusted templates;
- computing a lower boundary using the one or more adjusted templates, wherein an area is defined between the upper and lower boundaries;
- acquiring an unknown waveform morphology from the cardiac signal;
- comparing the unknown waveform morphology to the upper and lower boundaries;
- and
- classifying the unknown waveform morphology based on the comparison.
An implantable medical device, comprising;
- electrodes for sensing a cardiac signal;
- memory for storing a known template representing a known waveform morphology of the cardiac signal;
- a processor coupled to the memory, the processor configured to:
- receive the cardiac signal;
- compute one or more adjusted templates, each of the one or more adjusted templates computed by shifting the known template in at least one of time and amplitude;
- compute an upper boundary using the one or more adjusted templates;
- compute a lower boundary using the one or more adjusted templates, wherein an area is defined between the upper and lower boundaries;
- acquire an unknown waveform morphology from the cardiac signal;
- compare the unknown waveform morphology to the upper and lower boundaries;
- and
- classify the unknown waveform morphology based on the comparison.
A non-transitory computer readable storage medium storing a set of instructions which when implemented in a medical device system cause the system to:
- sense a cardiac signal;
- derive a known template representing a known waveform morphology from the cardiac signal;
- compute one or more adjusted templates, each of the one or more adjusted templates computed by shifting the known template in at least one of time and amplitude;
- compute an upper boundary using the one or more adjusted templates;
- compute a lower boundary using the one or more adjusted templates, wherein an area is defined between the upper and lower boundaries;
- acquire an unknown waveform morphology from the cardiac signal;
- compare the unknown waveform morphology to the upper and lower boundaries boundary;
- and classify the unknown waveform morphology based on the comparison.
Dependencies are inferred from the claim text.