Tunable Cathode Paddle Lead for Spinal Cord Stimulation
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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 adjusting to variations in cerebral spinal fluid thickness, which affects the effectiveness of pain relief and can lead to unwanted stimulation of dorsal root fibers.
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 create a flexible electrical field that preferentially stimulates dorsal column fibers while minimizing 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, then device simplicity is maintained, but adaptability to variations in cerebral spinal fluid thickness is reduced
Solution Approach 1:
The electrode array is divided into multiple independent columns (typically 3-4 columns) with electrodes spaced at different intervals. This segmentation allows each column to target different depths and locations of the spinal cord, accommodating variations in cerebral spinal fluid thickness without requiring a completely different lead design.
Solution Approach 2:
Different columns of electrodes are configured with different spacing patterns optimized for specific anatomical variations. Inner columns may have smaller spacing while outer columns have larger spacing, allowing localized optimization of current distribution to match the specific patient's anatomy and CSF thickness at each lateral position.
2Reliability
If multiple electrodes are activated to cover all target tissue, then pain relief effectiveness is improved, but unwanted stimulation of non-target tissue increases
Solution Approach 1:
Different columns of electrodes are selectively activated based on the specific pain pattern and target area. By configuring specific columns as cathodes and others as anodes, the system creates focused current pathways that stimulate only the intended dorsal column fibers while minimizing spread to dorsal root fibers and other non-target tissue.
Solution Approach 2:
The system dynamically configures electrode polarity and activation patterns based on real-time therapeutic needs. The neurostimulator can switch between different column configurations (e.g., alternating polarity patterns, sequential activation) to optimize pain relief while minimizing unwanted sensations, adapting to changing patient conditions and feedback.
3Manufacturing precision
If uniform electrode spacing is used, then manufacturing simplicity is maintained, but precision in targeting specific spinal cord regions is reduced
Solution Approach 1:
The electrode array is manufactured as segmented columns with predetermined spacing patterns. Each column is designed with specific inter-electrode distances optimized for different anatomical scenarios, allowing precise targeting capabilities while using standardized manufacturing processes for each column module.
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.