R-wave Detection in Cardiac Assist Drive Units
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Solution Overview
Problem
Current cardiac assist devices (CADs) operating in co- or counterpulsation modalities face challenges in accurately detecting the R-wave in electrocardiogram signals, leading to inefficiencies in timing the inflation and deflation of balloon pumps, which affects the synchronization with the cardiac cycle and overall efficacy of therapy.
Innovation Solution
The implementation of a drive unit system that utilizes a wavelet filter to process ECG signals, allowing for accurate detection of R-waves through a filtered ECG signal, and employs dual R-wave detection thresholds to ensure precise timing of balloon pump operations, minimizing both missed detections and false triggers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional ECG signal processing methods are used, then device complexity is reduced, but measurement precision of R-wave detection deteriorates
Solution Approach 1:
The patent introduces wavelet transform as an intermediary processing step between raw ECG signal acquisition and R-wave detection. The wavelet transform decomposes the ECG signal into different frequency components, allowing selective enhancement of R-wave characteristics while suppressing noise and other artifacts. This intermediary transformation enables more accurate R-wave detection without requiring direct complex filtering of the original signal.
2Reliability
If dual R-wave detection thresholds are implemented, then reliability of R-wave detection is improved, but device complexity increases
Solution Approach 1:
The patent employs dual thresholds (upper and lower bounds) for R-wave detection instead of a single threshold. The upper threshold prevents false positive detections by requiring strong R-wave signals, while the lower threshold ensures sensitivity to weaker but legitimate R-waves. This partial application of multiple detection criteria improves reliability without implementing the full complexity of comprehensive arrhythmia analysis algorithms.
Data Source
AI summary
A drive unit system for operating a cardiac assist device is disclosed. The drive unit system may include an R-wave detection module that makes a speculative detection of an R-wave associated with a received electrocardiogram (ECG) signal of a patient's heart and a conservative detection of the R-wave. The drive unit system includes a drive unit that may be coupled to the cardiac assist device and may operate the cardiac assist device based on the speculative detection and the conservative detection.