Implantable Medical Device Lead Failure Detection and Localization
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Solution Overview
Problem
Existing implantable medical devices (IMDs) struggle to accurately detect lead failures in electrodes, which can result in unnecessary pacing or stimulation pulses, causing discomfort to patients, and fail to identify the specific electrode associated with the failure, leading to inadequate corrective action.
Innovation Solution
A method and system that senses cardiac signals over multiple electrode combinations to identify potential lead failures and determine the specific electrode involved, using a channel selection module and failure detection module to correlate signals and compare them to predetermined thresholds, enabling the IMD to adjust its operation and avoid using the failed lead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If lead failure detection is performed using existing methods (R to R intervals, high impedance, impedance trends, slew rate), then lead failure can be detected, but the specific electrode associated with the failure cannot be identified
Solution Approach 1:
The patent divides the lead into multiple segments (electrodes) and tests each segment independently by applying test signals to specific electrode combinations. This segmentation allows the system to identify which specific electrode or electrode combination is failing, rather than just detecting that a failure occurred somewhere in the lead. The testing method systematically isolates each electrode's functionality to provide precise localization of the failure.
2Loss of time
If lead failure is detected early, then corrective action can be taken to avoid using the failed electrode, but existing methods do not provide robust solutions to mitigate failures in sensing electrodes
Solution Approach 1:
The patent implements preliminary testing of electrodes before they are used for sensing cardiac signals. By applying test signals and measuring impedance characteristics prior to actual operation, the system can identify failing electrodes in advance and prevent them from being used for sensing. This preliminary detection and isolation of failed electrodes ensures that only functional electrodes are used for critical sensing tasks, thereby preventing false arrhythmia detection and inappropriate therapy delivery.
3Loss of information
If multiple electrode combinations are tested to identify failure location, then the specific electrode can be identified, but the device complexity increases
Solution Approach 1:
The patent uses a multi-functional testing apparatus that can perform multiple types of measurements (impedance testing, signal injection, signal analysis) using the same basic hardware components. The testing system is designed to be versatile, capable of testing different electrode combinations and configurations without requiring separate specialized equipment for each test type. This universality reduces the overall complexity compared to having dedicated specialized testers for each electrode.
Data Source
AI summary
A method for detecting potential failures by a lead of an implantable medical device is provided. The method includes sensing a first signal over a first channel between a first combination of electrodes on the lead and sensing a second signal from a second channel between a second combination of electrodes on the lead. The method determines whether at least one of the first and second signals is representative of a potential failure in the lead and identifies a failure and the electrode associated with the failure based on which of the first and second sensed signals is representative of the potential failure. Optionally, when the first and second sensed signals are both representative of the potential failure, the method further includes determining whether the first and second sensed signals are correlated with one another. When the first and second sensed signals are correlated, the method declares an electrode common to both of the first and second combinations to be associated with the failure.