ECG Morphology Evaluation Timing in Implantable Cardiac Devices
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Solution Overview
Problem
Implantable cardiac devices with limited energy and processing resources face challenges in efficiently managing multiple treatment modalities using a single ECG sensing lead, requiring optimized timing and duration for ECG morphology evaluation to conserve energy and improve accuracy.
Innovation Solution
The method involves performing ECG morphology evaluation at predetermined timing and duration based on specific parameters such as scheduled stimulation events, tachycardia periods, and timing delays, with short sampling windows during stimulation and longer windows during tachycardia, to reduce energy consumption and enhance device management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If continuous ECG morphology evaluation is performed to ensure accurate detection of cardiac events, then measurement precision is improved, but energy consumption increases
Solution Approach 1:
The patent implements periodic morphology evaluation by activating the evaluation process only during specific time windows following sensed events (scheduled stimulation events or tachycardia events) rather than performing continuous evaluation. This periodic approach maintains detection accuracy for critical events while significantly reducing overall energy consumption by keeping the evaluation process inactive during normal sinus rhythm periods.
Solution Approach 2:
The patent dynamically changes the evaluation duration parameter based on the sensed event type: using shorter time windows (e.g., 50-500 ms) following scheduled stimulation events and longer time windows during tachycardia events. This parameter adaptation allows the system to optimize between detection accuracy and energy consumption by matching evaluation duration to clinical needs for different cardiac conditions.
2Measurement precision
If longer ECG sampling windows are used to improve morphology detection accuracy, then measurement precision is improved, but processing time and energy consumption increase
Solution Approach 1:
The patent adapts the sampling window duration parameter based on the type of cardiac event detected: using shorter windows (50-500 ms) for scheduled stimulation events where rapid assessment is needed, and longer windows during tachycardia events where more comprehensive morphology analysis is clinically warranted. This dynamic parameter adjustment optimizes the balance between detection accuracy and processing time for different clinical scenarios.
3Adaptability or versatility
If multiple treatment modalities are combined in a single implantable device, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent enables a single ECG sensing lead to serve multiple treatment modalities (ICD, CRT, and cardiac contractility modulation) by implementing a unified morphology evaluation system that adapts its operation based on the detected cardiac event type. This universal approach allows one lead to provide inputs for all modalities, reducing the need for separate sensing systems and simplifying overall device architecture while maintaining the ability to deliver diverse therapies.
Data Source
AI summary
The present invention discloses means and methods for performing evaluation of an electrocardiogram (ECG) morphology in an implantable device, optionally the implantable device has a single ECG sensing lead.