Implantable Cardiac Device Baseline Correction for Noise Detection
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Solution Overview
Problem
Implantable cardiac devices face interference from biological and external noise sources, which can prevent the detection of treatable conditions and lead to inappropriate therapy delivery due to baseline offset issues.
Innovation Solution
An implantable cardiac device with operational circuitry that performs noise detection and enables a baseline correction method, such as a dynamic heuristic filter, to prevent baseline offset and ensure accurate signal sensing, thereby avoiding inappropriate therapy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If noise detection is performed to identify noisy series, then reliability of cardiac event detection is improved, but device complexity increases due to additional processing requirements
Solution Approach 1:
The patent segments the cardiac signal analysis into distinct phases: initial baseline period for establishing reference levels, noise detection phase for identifying noisy series through turning point analysis, and baseline correction phase for restoring accurate baseline levels. This segmentation allows complex noise rejection functionality to be implemented through modular, manageable processing stages rather than a monolithic complex system
Solution Approach 2:
The patent applies preliminary action by establishing baseline levels during an initial quiet period before noise occurs, and by detecting noise patterns early through turning point analysis. This allows the system to proactively identify noisy series and apply baseline correction before noise-induced baseline offsets can corrupt subsequent cardiac event detection, preventing rather than merely reacting to detection errors
2Measurement precision
If baseline correction method is enabled to correct noise-induced baseline offset, then measurement precision of cardiac signals is improved, but loss of time occurs while waiting for noisy series to end before correction
Solution Approach 1:
The patent implements dynamic baseline correction where the correction method is adaptively enabled or disabled based on real-time detection of noisy series. The system dynamically adjusts its operation by monitoring for noise patterns, determining when baseline correction is needed, and applying correction only during appropriate intervals. This dynamic approach optimizes the balance between maintaining measurement precision and minimizing time loss by avoiding unnecessary correction operations
3Measurement precision
If turning point analysis is used for noise detection, then detection accuracy for noisy series is improved, but device complexity increases due to additional algorithm requirements
Solution Approach 1:
The patent extracts the essential noise detection functionality by focusing specifically on turning point analysis of the cardiac signal. Rather than implementing complex comprehensive noise rejection algorithms, the system extracts and applies the specific turning point detection method to identify noisy series. This extraction approach achieves effective noise detection by concentrating on the critical feature (turning points) that indicates noise presence, avoiding unnecessary algorithmic complexity
Data Source
AI summary
Implantable cardiac devices and methods of their use. A method of operation in an implantable cardiac device may include steps for characterizing detected events as noise or not noise, identifying a set of consecutive noise events or a threshold quantity of noise events in a set period of time and declaring a noisy series to have occurred. In response to the declaration of a noisy series, the method initiates a baseline correction algorithm. Devices for performing such methods are also disclosed.