Segmented DBS Electrodes for Directed Neural Stimulation
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Solution Overview
Problem
Existing deep brain stimulation (DBS) systems face limitations in stimulation specificity and biocompatibility, leading to side effects and reduced therapeutic efficacy over time due to large active electrode surfaces, difficulty in predicting optimal stimulation sites, and glial scarring.
Innovation Solution
A method and system for optimizing the stimulation pattern of implanted electrodes in excitable tissue by creating a directed electrical field through electrical stimulation between electrode pairs or clusters, assessing the effect of the field, and selecting electrode pairs that produce the most favorable therapeutic effect while minimizing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If large active electrode surfaces are used in DBS electrodes, then the stimulation coverage is improved, but the stimulation specificity deteriorates and glial scarring increases
Solution Approach 1:
The electrode is divided into multiple independently controllable contacts (e.g., 4 contacts per electrode, multiple electrodes per lead) rather than a single large active surface. This segmentation allows selective activation of smaller sub-regions to achieve precise stimulation of specific neural populations while avoiding activation of adjacent structures that would cause side effects.
Solution Approach 2:
Different contacts on the electrode are designed with different properties (e.g., different surface areas, different positions) to create localized stimulation fields. The system can apply different stimulation parameters to different contacts based on the specific therapeutic need, allowing optimization of stimulation specificity for each local region.
2Area of stationary object
If multiple electrodes are distributed along the same probe, then the stimulation coverage is improved, but the control of current distribution in target tissue deteriorates
Solution Approach 1:
The system provides dynamic control over which electrodes and contacts are activated, allowing real-time adjustment of current distribution patterns. Multiple stimulation configurations can be programmed and switched based on therapeutic response, enabling flexible optimization of current spread through different tissue regions.
Solution Approach 2:
The system can vary stimulation parameters (voltage, current, pulse width, frequency) independently for different electrode contacts to achieve desired current distribution. This parameter control allows compensation for variations in tissue impedance and optimization of stimulation field geometry.
3Reliability
If high current intensities are used to overcome glial scarring, then the stimulation effectiveness is maintained, but the energy consumption increases and battery life shortens
Solution Approach 1:
Instead of applying high current intensities to all electrodes simultaneously, the system activates only the specific subset of electrodes and contacts needed to achieve therapeutic effect. This partial activation reduces overall energy consumption while maintaining stimulation effectiveness in the target region by focusing current where it is most needed.
Solution Approach 2:
The system can adjust stimulation parameters to optimize the balance between effectiveness and energy consumption. By varying voltage, current, and pulse duration parameters, the system achieves adequate neural stimulation at lower power levels compared to conventional high-intensity stimulation.
4Ease of manufacture
If conventional DBS electrode designs are used, then the ease of implantation is maintained, but the biocompatibility deteriorates due to glial scarring
Solution Approach 1:
The electrode incorporates biocompatible coatings and flexible insulating materials that reduce mechanical irritation to surrounding tissue. The electrode design includes flexible polymer coatings that conform to tissue surfaces, reducing micromotion-induced damage and glial scarring while maintaining structural integrity for implantation.
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
The method allows for reduced energy consumption, increased stimulation specificity, and reduced incidence of side effects by identifying optimal electrode combinations and stimulation parameters that achieve therapeutic effects with minimal tissue damage.
Implementation Method 1
electrical stimulation between different combinations of electrode pairs in a cluster of electrodes, or the electrical stimulation between different combinations of electrode pairs in two or more clusters of electrodes, creates a directed electrical field
Data Source
AI summary
A method for optimization of a stimulation specificity of implanted electrodes in excitable tissue of a patient; wherein it comprises the step of electrical stimulation of excitable tissue between one or more combinations of electrode pairs in a cluster of electrodes, or electrical stimulation between one or more combinations of electrode pairs in two or more clusters of electrodes, wherein the two electrodes of said electrode pairs do not belong to the same cluster, wherein the electrical stimulation between different combinations of electrode pairs in a cluster of electrodes, or the electrical stimulation between different combinations of electrode pairs in two or more clusters of electrodes, creates a directed electrical field; wherein the effect of the directed electrical field is assessed after each stimulation step by registering information provided from the patient in view of a therapeutic effect, or by assigning each electrode pair a value related to said information provided by the patient; and choosing, based on the direction of the directed electrical field created, the electrode pair or pairs which give(s) rise to the most favorable assigned value.