Staggered Electrode Array for Neuromodulation
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Solution Overview
Problem
Existing electrode arrays for neuromodulation, particularly spinal cord stimulation, face challenges in achieving precise and effective neuromodulation due to limited stimulation specificity and controllability, especially at the sacral level, where current steering capabilities are poor, leading to imprecise muscle targeting and movement fluidity.
Innovation Solution
An electrode array design featuring a densely packed first section with parallel electrodes for current steering and a second section with regularly spaced electrodes, arranged symmetrically and transversally offset, allowing for targeted stimulation of spinal segments and dorsal roots, enhancing stimulation specificity and coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If electrodes are arranged with large spacing (at least 8mm between neighboring contacts), then the electrode array can be manufactured with simpler processes and lower cost, but the stimulation specificity and ability to target precise spinal segments is reduced
Solution Approach 1:
The electrode array is divided into multiple columns (at least three) with electrodes arranged in a staggered pattern across rows. This segmentation allows different electrode columns to be activated independently, enabling current steering to achieve precise spinal segment targeting while maintaining manufacturable spacing between individual electrodes.
Solution Approach 2:
The patent transitions from simple linear electrode spacing to a two-dimensional staggered grid arrangement across multiple columns and rows. This dimensional expansion allows current to be steered in multiple directions and combinations, achieving precise spatial selectivity without requiring extremely small inter-electrode distances.
2Manufacturing precision
If electrodes are densely packed in a single row for current steering, then stimulation specificity improves, but the device complexity increases and coverage of multiple spinal segments is limited
Solution Approach 1:
The electrode array is divided into multiple independent columns, each capable of being activated separately. This segmentation allows the system to target multiple spinal segments simultaneously or selectively activate individual columns for precise current steering, reducing the need for excessively dense single-row packing.
Solution Approach 2:
Each electrode column can serve multiple functions: individual activation for targeted stimulation, combined activation with adjacent columns for broader coverage, and various pairing combinations for current steering. This multi-functionality allows the array to handle diverse stimulation requirements without increasing physical density.
3Device complexity
If regular paddle design with evenly spaced electrodes is used, then the electrode array structure is simple and easy to manufacture, but the ability to provide current steering and enhance stimulation specificity is poor
Solution Approach 1:
The patent employs an asymmetric staggered arrangement where electrodes in different columns are offset relative to each other in the radial direction. This asymmetric positioning creates distinct current pathways and enables current steering capabilities that are impossible with symmetric evenly-spaced arrangements, while maintaining relatively simple manufacturing.
Solution Approach 2:
Different columns of electrodes are positioned at different radial offsets to optimize current steering for specific spinal segments. Each column's local positioning is tailored to achieve optimal stimulation patterns, with electrodes in adjacent columns having different radial coordinates to enable precise current direction control.
4Area of stationary object
If electrode spacing is increased to cover broader spinal cord areas, then the coverage area increases, but the stimulation specificity and muscle targeting precision deteriorates
Solution Approach 1:
The electrode array is divided into multiple columns that can be activated independently or in combination. This segmentation allows the system to achieve broad spatial coverage by activating multiple columns while maintaining precise current steering capability within each column, thus preserving muscle targeting precision despite increased overall coverage area.
Solution Approach 2:
The patent uses a two-dimensional staggered grid arrangement across multiple columns and rows, expanding from linear spacing to planar distribution. This dimensional expansion allows current to be steered with high precision in the azimuthal direction while covering broader spinal segments radially, decoupling coverage area from targeting precision.
Data Source
AI summary
The present invention relates to an electrode array for neuromodulation, comprising a first electrode section with more than two electrodes being arranged parallel and densely packed in the first electrode section, further comprising a second electrode section with more electrodes than in the first electrode section, the electrodes in the second electrode section being arranged symmetrically with respect to the longitudinal axis and transversal offset to each other. Furthermore, the present invention relates to a lead paddle and a neuromodulation system.