Lead Reversal Detection Circuit for Implantable Medical Devices
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Solution Overview
Problem
Implantable medical devices face hazards due to lead reversal, where a low voltage lead is inadvertently inserted into a high voltage bore, risking ineffective therapy delivery or tissue damage, as existing designs do not reliably prevent incorrect lead insertion.
Innovation Solution
Incorporating a lead reversal detection circuit connected to the device's bores, which measures parameters such as impedance or cardiac wall motion to detect incorrect lead insertion and generates an alert or disables therapies to prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If leads are made with similar bore dimensions to allow flexibility in insertion, then ease of operation is improved, but lead reversal hazards increase
Solution Approach 1:
The patent performs lead verification measurements (impedance, electrogram morphology, pacing capture) before enabling therapy delivery. This preliminary detection and verification process identifies incorrectly inserted leads before they can cause harm, resolving the contradiction by maintaining flexible bore dimensions while preventing lead reversal hazards through advance detection.
Solution Approach 2:
The system continuously monitors lead parameters (impedance values, electrogram characteristics, pacing response) and provides feedback to verify correct lead insertion. This feedback mechanism allows the device to detect and alert about lead reversal conditions while maintaining operational flexibility, thus resolving the contradiction between ease of insertion and safety.
2Reliability
If lead verification measurements are performed before therapy delivery, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent uses the device's existing therapeutic functions (pacing, sensing) to perform self-verification of lead insertion correctness. The system uses its own pacing pulses and sensing capabilities to measure impedance and evaluate electrogram morphology, eliminating the need for separate complex verification hardware while improving reliability.
Solution Approach 2:
The device performs multiple functions using the same hardware components: therapy delivery, lead verification, and safety monitoring all use the same electrodes and circuits. This multi-functionality approach improves reliability through comprehensive verification without significantly increasing device complexity, as existing components serve multiple purposes.
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
The solution effectively prevents lead reversal by accurately detecting and alerting against incorrect lead insertion, ensuring safe and appropriate therapy delivery, thereby reducing the risk of tissue damage and system malfunction.
Implementation Method 1
measures parameters such as impedance or cardiac wall motion to detect incorrect lead insertion
Implementation Method 2
measures parameters such as impedance or cardiac wall motion to detect incorrect lead insertion
Data Source
AI summary
A medical system including an implantable medical device having at least first and second bores, the first bore configured to receive a first lead, the first lead configured to deliver a first therapy, the second bore configured to receive a second lead, the second lead configured to deliver a second therapy, and a lead reversal detection circuit connected to the at least first and second bores, for detecting insertion of the first or second leads into the wrong bore.