Wearable Pacing Capture Verification via ECG Signal Analysis
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Solution Overview
Problem
Conventional wearable medical systems for pacing therapy face challenges in accurately verifying the capture of pacing pulses due to faulty electrodes and environmental factors, leading to potential life-threatening situations as they often fail to determine the success or failure of therapy.
Innovation Solution
A wearable medical system comprising ECG electrodes, an energy output device, an output circuit, and a processor that delivers pacing pulses and determines capture by analyzing ECG signals post-pulse delivery using a digital filter, providing alerts for both successful and unsuccessful captures to prevent further life-threatening situations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional arrhythmia detectors are used to detect cardiac rhythm disorders, then detection capability is provided, but the system cannot determine therapy success or failure leading to life-threatening situations
Solution Approach 1:
The patent combines the arrhythmia detection function and pacing therapy delivery function into a single integrated wearable medical system. The processor coordinates both detection and therapy delivery, allowing the system to monitor cardiac rhythms and administer pacing pulses without requiring separate devices. This integration enables automatic verification of therapy effectiveness by analyzing post-therapy ECG signals.
Solution Approach 2:
The system implements feedback by analyzing ECG signals after delivering pacing pulses to determine whether the therapy was successful. The processor evaluates the ECG signal characteristics following each pacing pulse and provides feedback on capture status. This closed-loop feedback mechanism allows the system to verify therapy effectiveness and alert users to unsuccessful attempts, preventing life-threatening situations.
2Reliability
If pacing pulses are delivered without verification, then therapy is provided quickly, but the patient is exposed to life-threatening situations due to undetected therapy failure
Solution Approach 1:
The system performs preliminary actions by establishing a blanking period immediately after pacing pulse delivery during which the ECG signal is filtered to remove artifact. This preliminary signal processing prepares the data for subsequent capture analysis, enabling rapid verification without delaying therapy delivery. The refractory period is also established in advance to define the window for capture detection.
Solution Approach 2:
The system rushes through the verification process by implementing efficient digital filtering and analysis algorithms that quickly determine capture status. The processor rapidly evaluates ECG signals within a defined time window after pacing delivery, skipping unnecessary processing steps. This allows the system to provide rapid feedback on therapy effectiveness without significant time loss.
3Measurement precision
If ECG signals are analyzed immediately after pacing pulse delivery, then capture detection is rapid, but electrical artifacts from the pacing pulse interfere with accurate detection
Solution Approach 1:
The system performs preliminary signal processing by implementing a blanking period immediately after pacing pulse delivery. During this period, the ECG signal is filtered to remove electrical artifacts generated by the pacing pulse. This preliminary filtering action prepares the signal for accurate capture analysis by eliminating interfering artifacts before the actual measurement begins.
Solution Approach 2:
The signal processing is segmented into distinct time periods: a blanking period for artifact removal, a refractory period for signal stabilization, and a capture detection window for analysis. This segmentation allows each processing stage to focus on specific tasks, improving measurement precision while managing complexity through modular processing steps.
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
The system effectively verifies pacing pulse capture, reducing exposure to life-threatening conditions by ensuring accurate delivery and notification of capture status, thereby improving patient safety during cardiac rhythm disorder treatment.
Implementation Method 1
a plurality of Electrocardiogram (ECG) electrodes to sense an ECG signal of a patient
Implementation Method 2
The blanking period is implemented digitally using a digital filter such as a finite impulse response filter, after delivering the pacing pulse for a finite time
Implementation Method 3
The energy output device may be a capacitor
Data Source
AI summary
A wearable medical system delivers and verifies capture of pacing pulses. The wearable medical system includes a support structure, a plurality of ECG electrodes, an energy output device coupled to an output circuit, a processor, and a plurality of therapy electrodes. The processor is in communication with the plurality of ECG electrodes and the output circuit. The processor causes a pacing pulse to be delivered to the patient via the energy output device, the output circuit, and the plurality of therapy electrodes. The processor determines whether the pacing pulse was captured by determining whether the ECG signal, within a window subsequent to a blanking period and a refractory period following delivery of the pacing pulse, meets one or more capture criteria. In response to a determination that the pacing pulse was captured, delivery of an additional pacing pulse is prevented else an additional pacing pulse is delivered to the patient.