Neurostimulation Paddle Lead with Variable Electrode Spacing
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Solution Overview
Problem
Current spinal cord stimulation systems face challenges in accurately targeting pain areas due to fixed electrode spacing and limited flexibility in medial-lateral tuning, which can lead to ineffective pain therapy, especially in areas like the lower back, where variations in cerebral spinal fluid thickness affect stimulation efficacy.
Innovation Solution
The development of a neurostimulation paddle lead with a medial-lateral electrode arrangement featuring adjustable electrode spacings and configurations, allowing for incremental shifting of cathodic and anodic currents to optimize the stimulation field's location and prevent unnecessary stimulation of dorsal root fibers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed electrode spacing is used in spinal cord stimulation leads, then the lead structure is simple and easy to manufacture, but the flexibility in targeting pain areas and tuning stimulation fields is limited
Solution Approach 1:
The patent implements variable electrode spacing by making the insulating layer thickness differ across the paddle surface. This creates a dynamic effective spacing that can be adjusted during programming by selecting different active electrode pairs, allowing the system to adapt to different pain locations and CSF thickness conditions without physically reconfiguring the lead.
Solution Approach 2:
The patent applies different insulating layer thicknesses at different locations on the paddle surface, creating non-uniform electrode spacing. This local variation allows specific regions to have optimized spacing for targeting particular pain areas (e.g., lower back), while maintaining overall lead simplicity.
2Manufacturing precision
If standard electrode arrangement is used, then the lead design is simple, but the precision in stimulating dorsal column fibers while avoiding dorsal root fibers is insufficient
Solution Approach 1:
The patent segments the paddle surface into multiple regions with different insulating layer thicknesses, creating distinct effective electrode zones. This segmentation allows independent control of stimulation fields in different areas, enabling precise targeting of dorsal column fibers while avoiding dorsal root fibers through selective activation of specific electrode pairs.
Solution Approach 2:
The patent changes the effective electrode spacing parameter by varying the insulating layer thickness across the paddle. This parameter change allows the same physical electrode arrangement to create different stimulation field configurations, improving precision in fiber-selective stimulation without adding complex electrode structures.
3Adaptability or versatility
If uniform electrode spacing is used, then the lead fabrication is straightforward, but the ability to account for variations in cerebral spinal fluid thickness is limited
Solution Approach 1:
The patent applies different insulating layer thicknesses at different locations on the paddle surface, creating non-uniform electrode spacing. This local variation allows the lead to account for variations in CSF thickness at different spinal levels without requiring complex manufacturing processes, as the insulating layer can be formed with varying thickness through standard fabrication techniques.
4Adaptability or versatility
If multiple tunable central cathodes are implemented, then the medial-lateral and rostral-caudal flexibility is increased, but the device complexity increases
Solution Approach 1:
The patent creates multiple tunable central cathodes dynamically through programming by selecting different active electrode pairs with different insulating layer thicknesses. This allows the system to achieve multiple cathode configurations without physically implementing separate cathodes, maintaining flexibility while controlling device complexity.
Solution Approach 2:
The patent makes the existing electrode array multi-functional by using the same physical electrodes to serve as different cathodes and anodes through programming. The insulating layer thickness variations enable the same electrode structure to provide multiple stimulation configurations, achieving universality without adding components.
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 enhances the precision and flexibility of spinal cord stimulation, improving pain relief by allowing for more effective targeting of dorsal column fibers while minimizing stimulation of dorsal root fibers, thus providing better therapeutic outcomes with reduced discomfort.
Implementation Method 1
conveying electrical energy between the electrodes to create a medial-lateral electrical field
Data Source
AI summary
A neurostimulation paddle lead, method of neurostimulation, and neurostimulation system are provided. The neurostimulation paddle lead carries a plurality of electrodes comprising at least four columns of electrodes having a spacing between two inner electrode columns less than a spacing between the inner electrode columns and adjacent outer electrode columns. The inner electrode columns may also be longitudinally offset from the outer electrode columns. The methods and neurostimulation systems steer current between the electrodes to modify a medial-lateral electrical field created adjacent spinal cord tissue.