Active Lead Integrity Surveillance via Test Signal Injection
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Solution Overview
Problem
Current methods for diagnosing lead anomalies in implanted medical devices, such as insulation breaches, face challenges in achieving high sensitivity and specificity, often resulting in false positives and inadequate detection of high-voltage insulation breaches before shock delivery, which can lead to inappropriate shocks and unnecessary lead replacements.
Innovation Solution
The implementation of active surveillance monitoring methods that involve injecting a test signal on the output current pathway and simultaneously monitoring an independent current pathway for induced signals, allowing for the detection of lead anomalies without relying on unpredictable anomalous signals and enabling response actions like secondary confirmation tests or alerts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If passive monitoring methods are used to detect lead anomalies, then the device complexity is reduced, but the measurement precision and reliability of anomaly detection deteriorate, resulting in false positives and inadequate detection of high-voltage insulation breaches
Solution Approach 1:
The system performs preliminary testing by injecting a test signal through the output current pathway before actual shock delivery. This preliminary action allows the monitoring pathway to detect insulation breaches and conductor fractures in advance, improving detection precision without requiring complex real-time monitoring during shock delivery
Solution Approach 2:
A test signal acts as an intermediary to indirectly detect lead anomalies. Instead of directly monitoring for anomalies during normal operation, the system injects a test signal and uses the monitored response to infer the presence of insulation breaches or fractures, achieving high detection precision with manageable device complexity
2Reliability
If active surveillance monitoring is implemented to improve detection precision, then the reliability of lead anomaly detection improves, but the use of energy and device complexity increase
Solution Approach 1:
The active surveillance monitoring is performed periodically at scheduled intervals rather than continuously. The controller injects test signals and monitors responses at discrete time points, which maintains high detection reliability while significantly reducing energy consumption compared to continuous monitoring
Solution Approach 2:
The system applies a controlled test signal that exceeds normal operating levels temporarily to stress-test the lead insulation and conductors. This partial/excessive action during testing improves reliability of anomaly detection while the temporary nature of the elevated signal limits additional energy consumption
3Measurement precision
If traditional impedance monitoring is used, then the ease of operation is maintained, but the measurement precision deteriorates, failing to detect insulation breaches with intact dielectric properties at low voltages
Solution Approach 1:
The system changes the test parameters by injecting a controlled test signal with specific voltage levels and waveforms that stress the insulation dielectric properties. This parameter change allows detection of insulation breaches that would be invisible to traditional low-voltage impedance monitoring, improving measurement precision while the automated process maintains ease of operation
Solution Approach 2:
The system performs preliminary stress testing with controlled test signals before clinical use. This preliminary action reveals insulation defects that would not manifest during normal low-voltage operation, improving measurement precision without complicating the ease of operation during actual device use
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 provides sensitive and specific diagnosis of lead anomalies, reducing false positives and enabling early detection of insulation breaches and conductor fractures, thereby improving patient safety and reducing unnecessary interventions.
Implementation Method 1
a test signal is delivered using the implanted medical device... the test signal is delivered through electrodes attached to the patient's skin from an external test-signal generator
Implementation Method 2
simultaneously monitoring a different and independent monitor current pathway for an induced signal to detect any anomalous indications of, or reactions to, the test signal
Data Source
AI summary
Active surveillance of potential lead anomalies in implanted medical leads utilizes test signal(s) delivered through an output current pathway and induced signals monitored via an independent monitor current pathway to detect for any reactions to the test signals in the induced signals. Various specific responses can be initiated if a potential insulation breach or anomaly in the implanted medical lead is identified due to detection of a “positive” test result in the induced signals on the monitor current pathway in reaction to a test signal applied to the output current pathway.