Implantable Lead Integrity via Impedance Variability Analysis
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Solution Overview
Problem
Existing impedance-based diagnostics for implantable medical leads are unable to detect partial fractures, which can cause sensing and therapy integrity issues, due to their low resolution and temporal frequency, and are often confounded by changes in patient tissue or fluid impedance.
Innovation Solution
Evaluating the integrity of implantable medical leads by determining the variability of impedance measurements at a higher frequency, such as 65 samples per second, with a resolution of less than 0.1 ohms, to detect early signs of conductor fractures or partial fractures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing impedance-based diagnostics are used with low measurement frequency and resolution, then device complexity is reduced, but measurement precision deteriorates leading to inability to detect partial fractures
Solution Approach 1:
The patent changes the measurement parameters by increasing both the temporal frequency (to 65 samples per second) and resolution (to less than 0.1 ohms) of impedance measurements. This enables detection of partial fractures that would be invisible to existing diagnostics with lower measurement precision.
2Measurement precision
If impedance measurements are taken at high frequency with high resolution, then measurement precision improves for detecting partial fractures, but use of energy increases
Solution Approach 1:
The system performs high-frequency impedance measurements periodically at 65 samples per second rather than continuously, allowing detection of partial fractures while managing energy consumption through structured measurement intervals.
3Reliability
If existing impedance thresholds are used for fracture detection, then ease of operation is maintained, but reliability deteriorates due to inability to detect partial fractures
Solution Approach 1:
The system performs preliminary high-resolution impedance measurements to establish baseline values and detect early signs of partial fractures before they progress to complete fractures, improving reliability through early detection capability.
Solution Approach 2:
The system continuously monitors impedance variability and provides feedback when thresholds are exceeded, enabling reliable detection of partial fractures while maintaining operational simplicity through automated alert generation.
4Measurement precision
If measurement resolution is increased to less than 0.1 ohms, then measurement precision improves for detecting partial fractures, but difficulty of detecting and measuring decreases due to signal noise
Solution Approach 1:
The system performs preliminary high-resolution impedance measurements to establish baseline values and detect early signs of partial fractures before they progress to complete fractures, improving reliability through early detection capability.
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
This approach enables earlier detection of lead conductor fractures and partial fractures, potentially preventing complete fractures and associated therapy and sensing integrity issues.
Implementation Method 1
acquiring a set of measurements of impedance of an implantable medical lead
Data Source
AI summary
A method comprises acquiring a set of measurements of impedance of an implantable medical lead, determining a metric of variability of the set of impedance measurements, determining that the metric of variability satisfies a criterion, and generating a lead integrity alert in response to the metric of variability satisfying the criterion.