Variable Electrode Spacing Implantable Lead for LBB Pacing
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Solution Overview
Problem
Existing implantable leads for left bundle branch pacing have fixed electrode spacing, which can lead to suboptimal positioning and potential tissue damage during implantation, as the ring electrode often needs to be driven deeper into the septal wall, compromising sensing accuracy and increasing the risk of damaging surrounding tissue.
Innovation Solution
An implantable lead design featuring a helical electrode that can extend into the septal wall to engage the left bundle branch while the ring electrode is independently positioned on the septal wall surface, allowing for variable electrode spacing through a threaded interface that converts rotational movement into axial movement, enabling optimal placement of both electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fixed electrode spacing is used in existing pacing leads, then the lead structure is simple and easy to manufacture, but the ring electrode must be driven deeper into the septal wall to access the LBB, creating tissue damage and compromising sensing accuracy
Solution Approach 1:
The patent applies the dynamics principle by making the electrode spacing variable rather than fixed. The helical electrode can be independently advanced or retracted relative to the ring electrode, allowing the spacing between them to change dynamically during implantation. This enables the helical electrode to reach deep into the septal wall for LBB access while the ring electrode remains at the optimal sensing location on the surface, thereby resolving the technical contradiction between operational ease and device complexity.
2Reliability
If the ring electrode is driven deeper into the septal wall to access LBB with fixed spacing, then the helical electrode can engage the target tissue, but the ring electrode creates bore holes and damages surrounding tissue including the right bundle branch
Solution Approach 1:
The patent applies segmentation by separating the functions of the two electrodes. The helical electrode is dedicated to pacing the LBB by engaging deep in the septal wall, while the ring electrode is dedicated to sensing and remains positioned on the surface. This functional segmentation allows each electrode to perform its optimal function without compromising tissue integrity, resolving the contradiction between pacing reliability and tissue damage prevention.
3Measurement precision
If fixed electrode spacing is used, then manufacturing is simpler, but the ring electrode cannot be independently positioned for optimal sensing accuracy
Solution Approach 1:
The patent implements dynamics by enabling independent positioning of the helical electrode relative to the ring electrode through a variable spacing mechanism. During implantation, the helical electrode can be advanced or retracted to achieve the optimal sensing position for the ring electrode on the septal wall surface, while maintaining the ability to engage the LBB deeply. This dynamic adjustment capability improves sensing accuracy without significantly complicating the manufacturing process.
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 design improves pacing and sensing accuracy by allowing for precise positioning of both electrodes, reducing tissue damage and enhancing the reliability of cardiac stimulation, while maintaining the ring electrode at the tissue surface for optimal sensing.
Implementation Method 1
The threaded surface converts rotation of the inner lead subassembly relative to the outer lead subassembly into relative axial movement of the helical electrode relative to the ring electrode
Data Source
AI summary
An implantable lead includes an inner lead subassembly contained within and movable relative to an outer lead subassembly. The inner lead subassembly has a helical electrode to pace a target anatomy. The outer lead subassembly includes a ring electrode to sense or pace the target anatomy. A threaded interface interconnects the inner lead subassembly and the outer lead subassembly such that relative rotation of the lead subassemblies causes relative axial movement between the helical electrode and the ring electrode. Other embodiments are also described and claimed.