Multi-electrode Lead Depth Control via Impedance Monitoring
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Solution Overview
Problem
Current His bundle pacing techniques face challenges such as uncertain lead positioning, high capture thresholds, and increased risk of premature battery depletion due to variable anatomy and tissue structure, particularly in patients with dilated hearts, leading to suboptimal pacing and frequent lead revisions.
Innovation Solution
A novel multi-electrode lead with a distal fixation electrode and intermediate electrodes, allowing for continuous impedance monitoring during implantation to ensure precise depth control and avoid septal penetration, enabling effective left bundle branch pacing with a conventional pacemaker using an adapter for secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bipolar lead is deployed into the interventricular septum for LBB pacing, then left ventricle capture can be achieved, but the risk of septal penetration increases due to variable septum thickness and uncertain LBB fiber location
Solution Approach 1:
The lead is divided into multiple electrode segments (first distal fixation electrode, intermediate electrodes, and second pacing electrode) positioned at different depths. This segmentation allows incremental impedance monitoring at each level, enabling precise depth control without penetrating through the entire septum.
Solution Approach 2:
Impedance monitoring is implemented at multiple electrode levels to provide real-time feedback during implantation. When impedance change indicates tissue contact at the appropriate depth, the system provides feedback to stop advancement, preventing over-penetration while ensuring adequate tissue engagement for reliable capture.
2Reliability
If the distal electrode is deployed deep into the septum to achieve low capture threshold, then pacing efficacy improves, but the risk of entering the left ventricular cavity increases
Solution Approach 1:
Impedance monitoring is performed in advance at intermediate electrode positions before the pacing electrode reaches its final deployment position. This preliminary action detects tissue contact early, allowing the operator to stop advancement before penetrating too deeply or entering the ventricular cavity.
Solution Approach 2:
Intermediate electrodes serve as intermediary sensing elements that monitor tissue contact at shallower depths. These intermediaries provide early warning of tissue engagement, allowing the main pacing electrode to be positioned at the optimal depth without direct trial-and-error advancement.
3Reliability
If conventional His bundle pacing is performed, then physiological pacing can be achieved, but implantation success varies widely due to challenging anatomy and expertise requirements
Solution Approach 1:
The lead performs self-positioning assistance through automated impedance monitoring at multiple levels. The system independently detects tissue contact and provides depth feedback, reducing reliance on operator expertise for precise positioning while maintaining the physiological benefits of conduction system pacing.
Solution Approach 2:
The patent replaces manual mechanical positioning judgment with electrical impedance-based depth sensing. Instead of relying on operator skill to judge tissue contact mechanically, the system uses electrical properties to automatically determine implantation depth, simplifying the procedure.
4Manufacturing precision
If multiple electrodes are included in the lead for depth control, then implantation precision improves, but lead complexity and connection requirements increase
Solution Approach 1:
The multi-electrode lead is designed to be compatible with conventional pacemakers through an adapter interface. The same lead structure serves dual purposes: impedance monitoring for depth control and pacing delivery, while interfacing with standard pacemaker systems to avoid requiring entirely new equipment.
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 provides accurate depth control during lead implantation, reducing the risk of septal penetration and achieving optimal left ventricle capture at lower voltages, thereby improving pacing efficacy and reducing the need for repeated pacemaker replacements.
Implementation Method 1
Electrical impedance is monitored for at least one, several, or all the intermediate electrodes during the lead implantation procedure. A change of impedance for each of the monitored electrodes reaching or exceeding a predefined impedance change threshold may be used to detect the point of contact and entry of the monitored electrode into the cardiac tissue.
Data Source
AI summary
A method for pacing left bundle branch of the heart comprising implantation of a multi-electrode lead at a desired depth into the interventricular septum from the right ventricle, wherein the depth control during the implantation of the distal electrode is provided by monitoring electrical impedance for one or more intermediate electrodes. Reaching of exceeding a threshold of electrical impedance change is used to determine the entry of a corresponding intermediate electrode from the blood stream in the right ventricle into the cardiac tissue of the septum. Known distances between intermediate spaced apart electrodes and the distal electrode allow determination of the implantation depth of the distal electrode.