Continuous Pacing Effectiveness Monitoring via Activation Time Measurement
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Solution Overview
Problem
Current implantable medical devices (IMDs) face challenges in continuously monitoring the effectiveness of pacing therapy without interrupting the treatment, as they rely on temporary suspension of pacing to determine capture efficacy, which can lead to ineffective pacing due to issues like lead dislodgement or suboptimal stimulation locations.
Innovation Solution
The implementation of a system that includes a multipolar lead with additional electrodes for beat-to-beat monitoring of activation times, allowing for continuous assessment of pacing therapy effectiveness by measuring the time between delivering a pacing stimulus and sensing electrical activity using a sensing electrode, without interrupting the therapy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pacing therapy is temporarily suspended to determine capture efficacy, then measurement precision of pacing effectiveness is improved, but productivity of continuous pacing therapy deteriorates
Solution Approach 1:
The patent applies preliminary action by measuring activation times using non-pacing electrodes before pacing therapy is suspended. The system continuously monitors activation times at multiple locations during ongoing pacing therapy, establishing baseline measurements that allow for later assessment of capture efficacy without requiring therapy interruption. This preparatory monitoring enables accurate effectiveness determination while maintaining continuous pacing treatment.
Solution Approach 2:
The patent uses non-pacing electrodes as intermediaries to monitor pacing effectiveness. These dedicated sensing electrodes detect electrical activation times at various cardiac locations without being used for pacing delivery. By separating the monitoring function from the pacing function, the system can continuously assess capture efficacy through these intermediary sensors while the pacing therapy proceeds uninterrupted through pacing electrodes.
2Measurement precision
If additional non-pacing electrodes are added for continuous monitoring, then measurement precision of activation times is improved, but device complexity increases
Solution Approach 1:
The patent applies multi-functionality by designing electrodes that serve dual purposes: pacing electrodes deliver therapeutic stimulation while non-pacing electrodes on the same lead structure provide continuous activation time monitoring. The lead system functions both as a therapy delivery mechanism and a monitoring system, with different electrode segments specialized for their respective functions but integrated within a single unified lead architecture.
Solution Approach 2:
The patent segments the lead into distinct functional zones: pacing electrodes for therapy delivery and non-pacing electrodes for monitoring. This segmentation allows each electrode type to be optimized for its specific function while maintaining a coordinated system. The spatial separation of monitoring electrodes from pacing electrodes within the same lead enables independent optimization of each function without requiring completely separate device systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables continuous, uninterrupted monitoring of pacing therapy effectiveness, allowing for timely adjustments or alerts if the therapy becomes ineffective, thereby maintaining optimal cardiac pacing and reducing complications from ineffective stimulation.
Implementation Method 1
sense electrical activity resulting from the stimulus using a sensing electrode
Data Source
AI summary
Methods and/or devices may be configured to track effectiveness of pacing therapy by monitoring activation times over time, e.g., between pacing stimulus and electrical activity resulting from the pacing stimulus. Generally, the methods and/or devices may determine whether the delivered pacing therapy was effective based on the measured activation times.