Lead Insulation Breach Detection via External Test Signals
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Solution Overview
Problem
Implantable medical leads often experience insulation breaches and externalization of conductors due to stress and degradation, leading to undesirable operation and challenging detection using conventional methods like impedance monitoring, fluoroscopy, and defibrillation shock testing.
Innovation Solution
A medical device system that includes an external signal generator and electrodes to deliver a test signal to the patient, and an implantable medical device to analyze the induced electrical signals on the leads for characteristics indicative of insulation breaches or externalizations, allowing for the detection of lead-related conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional impedance monitoring is used to detect lead conditions, then the detection method is simple, but the detection precision is insufficient for insulation breaches and externalizations
Solution Approach 1:
The patent introduces an external signal generator as an intermediary device to deliver test signals to the patient's body. This external device enables precise detection of lead insulation breaches and externalizations by generating controlled test signals that interact with the lead conductors, allowing the implantable device to measure induced signals and detect lead conditions with high precision without requiring complex internal signal generation circuitry.
Solution Approach 2:
The patent replaces conventional impedance monitoring methods with an electrical field-based detection approach. Instead of using simple impedance measurements, the system uses induced electrical signals from external test signals to detect lead conditions. This substitution enables more precise detection of insulation breaches and externalizations by measuring the electrical characteristics of induced signals rather than relying on basic impedance values.
2Measurement precision
If fluoroscopy is used to detect lead conditions, then detection capability is improved, but patient exposure to ionizing radiation increases
Solution Approach 1:
The patent replaces fluoroscopy (an optical/radiation-based imaging method) with an electrical signal-based detection method. The system uses external signal generators to deliver test signals and measures induced electrical signals on the leads to detect insulation breaches and externalizations. This substitution eliminates ionizing radiation exposure while maintaining detection capability through electrical field interactions with the lead conductors.
Solution Approach 2:
The patent introduces electrical test signals as an intermediary between the detection system and the lead conductors. Instead of using ionizing radiation to visualize lead conditions, the system uses controlled electrical test signals that induce measurable signals on the leads. This intermediary approach enables safe, radiation-free detection of lead insulation breaches and externalizations through electrical measurements.
3Measurement precision
If defibrillation shock testing is used to detect lead conditions, then detection accuracy is improved, but patient discomfort and safety risks increase
Solution Approach 1:
The patent uses partial action by applying low-energy test signals that are sufficient to induce measurable signals on the leads without delivering full defibrillation shock energy. The external signal generator delivers controlled test signals at energy levels well below defibrillation thresholds, enabling accurate detection of lead insulation breaches and externalizations without causing patient discomfort or safety risks associated with high-energy shock testing.
Solution Approach 2:
The patent performs preliminary detection using low-energy test signals before any high-energy defibrillation therapy is delivered. The system continuously or periodically delivers safe test signals to monitor lead conditions, enabling early detection of insulation breaches and externalizations. This preliminary action prevents the need for uncomfortable and potentially risky defibrillation shock testing by maintaining ongoing monitoring at safe energy levels.
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 method effectively identifies lead-related conditions without the need for ionizing radiation or uncomfortable defibrillation shock testing, enabling modifications to therapy or lead replacement, thereby ensuring proper device operation and patient comfort.
Implementation Method 1
A medical device system that includes an external signal generator and electrodes to deliver a test signal to the patient, and an implantable medical device to analyze the induced electrical signals on the leads
Data Source
AI summary
A technique for identifying lead-related conditions, such as insulation breaches and/or externalization of lead conductors, includes analyzing characteristics of electrical signals generated on one or more electrode sensing vectors of the lead by a test signal to determine whether a lead-related condition exists. The characteristics of the electrical signals induced on the lead by the test signal may be significantly different on a lead having an insulation breach or externalized conductor than on a lead not having such lead-related conditions. As such, the implantable medical device may be subject to a known test signal and analyze the signals on the lead to detect lead-related conditions.