Cerebral Electrodes with Segmented Anodes for Focused Stimulation
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Solution Overview
Problem
Existing neural tissue stimulation technologies often cause unwanted side effects due to the inability to precisely control the stimulation field, affecting tissues both near and far from the region of interest.
Innovation Solution
The use of leads with strategically arranged anodal and cathodal electrodes, where unbalanced currents create a net anodal flow at a distance from the region of interest, allowing for focused cathodal stimulation while minimizing anodal stimulation in undesired areas, and employing internal edges on electrodes to enhance directional control of the electric field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional bipolar stimulation is used with cathodal stimulation at the region of interest, then effective neural stimulation is achieved, but unwanted side effects occur in adjacent tissues due to inability to precisely control the stimulation field
Solution Approach 1:
The electrode array is segmented into multiple independently controllable electrodes arranged around the region of interest. This allows selective activation of specific electrodes to create focused cathodal stimulation zones while using other electrodes as anodal shields to prevent spread to adjacent tissues, thereby resolving the contradiction between stimulation effectiveness and minimizing side effects.
Solution Approach 2:
Different regions of the electrode array are assigned different functions: some electrodes serve as cathodal stimulation contacts while others serve as anodal shielding contacts. This local differentiation enables precise control of the electric field distribution, allowing effective stimulation at the region of interest while limiting the stimulation field to prevent unwanted effects in adjacent tissues.
2Reliability
If the stimulation field is expanded to ensure adequate coverage of the region of interest, then treatment effectiveness is improved, but the area of unwanted stimulation increases
Solution Approach 1:
The electrode configuration creates an asymmetric electric field distribution where cathodal stimulation is concentrated in specific directional zones toward the region of interest, while anodal shielding creates corresponding asymmetric boundaries. This asymmetric arrangement allows adequate coverage of the target area while asymmetrically limiting the overall stimulation field to minimize unwanted areas.
Solution Approach 2:
The patent transitions from traditional two-dimensional bipolar stimulation to a three-dimensional multi-polar configuration with electrodes arranged around the region of interest in multiple dimensions. This spatial arrangement creates focused stimulation zones while using surrounding anodal electrodes to confine the field, effectively increasing targeted coverage without proportionally increasing the total stimulated area.
3Measurement precision
If unbalanced currents are applied to create net anodal flow at a distance, then directional control of the electric field is enhanced, but the complexity of current management increases
Solution Approach 1:
The system dynamically adjusts the current distribution across different electrodes based on real-time needs. The pulse generator can independently control the amplitude and polarity of currents to each electrode, enabling flexible creation of unbalanced current patterns for directional field control. This dynamic adaptability achieves precise directional control while managing complexity through programmable control rather than fixed complex circuitry.
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 enables targeted neural stimulation with reduced side effects by limiting the stimulation area and controlling the electric field shape, ensuring effective treatment at the region of interest while minimizing impact on adjacent tissues.
Implementation Method 1
by applying charge differences between circumferentially distributed electrodes, a smaller stimulation field may be established
Implementation Method 2
providing to anodes and cathodes on the lead unbalanced currents, such that a net flow of current occurs
Data Source
Figure 1
Figure 2~3B
Figure 4~5F
AI summary
Neural stimulation using various electrode configurations and/or anodic flow to control the stimulation effect. In some embodiments, a remote cathodal collecting electrode is used. In some embodiments, a multi-polar stimulation includes anodes on either side of a cathode.