Spinal Cord Stimulation Electrode Fractionalization for Linear Electric Fields
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Solution Overview
Problem
Current neural modulation technologies face challenges in effectively targeting and modulating complex neural structures, such as the spinal cord, to achieve optimal pain relief without inducing adverse side effects like paresthesia.
Innovation Solution
The development of a system that includes electrodes configured to create a linear electric field over a volume of neural tissue, using a neural modulation generator and a programming system to determine electrode fractionalizations based on a target multipole, which directionally and progressively stacks fractionalizations of target poles to minimize activation of dorsal column fibers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional neural modulation is used to treat chronic pain, then pain relief is achieved, but paresthesia and other adverse side effects are induced
Solution Approach 1:
The patent applies local quality by creating a linear electric field that is non-uniform in space, with different field strengths at different locations. The field is designed to be stronger in the dorsal horn region (target area) and weaker in the dorsal column region (non-target area), allowing selective modulation of pain-processing neurons while avoiding activation of proprioceptive fibers that cause paresthesia.
Solution Approach 2:
The patent segments the neural modulation by dividing the electrode array into multiple independently controllable electrodes along the longitudinal axis of the spinal cord. Each electrode can be independently adjusted to create a linear field distribution, enabling separate optimization of field strength in different spinal segments to target pain pathways while avoiding non-target areas.
2Reliability
If the electric field is strengthened in targeted regions to maximize pain relief, then therapeutic effect is improved, but activation of non-targeted tissues increases causing side effects
Solution Approach 1:
The patent implements local quality through a non-uniform linear electric field where the field strength varies continuously along the longitudinal axis. The field is deliberately designed to have peak strength in the dorsal horn (target) and gradually decrease toward the dorsal column (non-target), allowing maximum therapeutic effect in the pain-processing region while minimizing activation of non-targeted tissues.
Solution Approach 2:
The patent applies dynamics by enabling independent control of each electrode's current amplitude through a programmable stimulus generator. This allows real-time adjustment of the linear field distribution to optimize the balance between strengthening the therapeutic effect in target regions and preventing activation of non-targeted tissues, adapting to individual patient responses.
3Device complexity
If traditional electrode configurations are used, then device simplicity is maintained, but precision in targeting specific neural volumes is insufficient
Solution Approach 1:
The patent segments the electrode array into multiple discrete electrodes distributed along the longitudinal axis, with each electrode capable of independent current delivery. This segmentation enables precise control over the spatial distribution of the electric field, allowing accurate targeting of specific neural volumes such as the dorsal horn while maintaining a relatively simple electrode physical structure.
Solution Approach 2:
The patent applies parameter changes by independently adjusting the current amplitude, polarity, and timing parameters of each electrode through a programmable stimulus generator. This allows precise control of the linear electric field characteristics (strength, direction, and spatial distribution) to accurately target specific neural volumes without requiring complex electrode geometries.
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 allows for precise control of the neural modulation, maximizing the electric field in targeted regions while minimizing activation of non-targeted tissues, thereby achieving effective pain relief with reduced side effects.
Implementation Method 1
a linear electric field over the volume of tissue
Implementation Method 2
delivering neural modulation through a set of electrodes
Data Source
AI summary
A system may include electrodes on at least one lead configured to be operationally positioned for use in modulating a volume of neural tissue, a neural modulation generator configured to deliver energy using at least some electrodes to modulate the volume of neural tissue, a programming system configured to program the programmed modulation parameter set, including determine electrode fractionalizations for the electrodes based on a target multipole. The programmed parameter set may include the determined electrode fractionalizations. The target multipole may be used to determine electrode fractionalizations having at least three target poles that directionally and progressively stack fractionalizations of target poles to provide a linear electric field over the volume of tissue. The neural modulation generator may be configured to use the programmed modulation parameter set to provide the linear electric field over the volume of tissue.