Transcortical DC Electric Field Modulation of Spreading Depression
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Solution Overview
Problem
Current methods lack effective modulation and control over spreading depression (SD) in the brain, which is associated with conditions like migraine, stroke, and traumatic brain injury, as they do not adequately address the propagation and initiation of SD waves.
Innovation Solution
The application of transcortical DC electric fields and currents to modulate SD, allowing for the suppression, confinement, and arrest of SD waves by varying electric field strengths and polarities, which can be administered before or during SD initiation, using electrodes or magnetic fields to create specific stimulation patterns based on brain state detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If surface positive DC polarization is applied to arrest SD propagation, then SD wave propagation is effectively arrested, but the device complexity and control precision requirements increase
Solution Approach 1:
The patent applies parameter changes by systematically varying DC polarization strength and polarity to achieve effective SD wave arrest. By optimizing the polarization parameters (strength, duration, polarity), the system achieves reliable SD modulation while managing device complexity through controlled parameter adjustment rather than complex structural design.
Solution Approach 2:
The patent implements feedback control by monitoring brain state and adjusting polarization parameters in real-time. This feedback mechanism ensures effective SD wave arrest while adapting the electric field application to actual physiological conditions, thereby improving reliability without requiring overly complex fixed systems.
2Ease of operation
If transcortical DC polarization is applied to modulate SD, then SD propagation can be controlled, but the precision of electric field application and state detection must be high
Solution Approach 1:
The patent uses parameter changes to simplify operation while achieving precise effects. By adjusting polarization strength and timing parameters, the system provides easy-to-operate SD modulation without requiring extremely precise electric field application, as the broad parameter ranges accommodate variations in individual anatomy and physiology.
Solution Approach 2:
The patent applies dynamics by making the polarization parameters adjustable and adaptable rather than fixed. This dynamic approach allows the system to maintain ease of operation while achieving the necessary precision through real-time parameter optimization based on individual patient needs and response.
3Object-affected harmful factors
If DC electric fields are used to confine SD to superficial layers, then deep brain structures are protected, but the complexity of delivering targeted electric fields increases
Solution Approach 1:
The patent applies local quality by creating different polarization effects at different cortical depths. Surface positive DC polarization naturally confines the electric field effects to superficial layers, providing local protection to deep brain structures without requiring complex targeted delivery systems. The field strength naturally decays with depth, creating a protective gradient.
Solution Approach 2:
The patent uses dimensionality change by applying polarization from the surface (one-dimensional approach) rather than requiring deep brain electrode placement (three-dimensional targeting). This surface-based approach protects deep structures by design, as the electric field naturally attenuates with depth, avoiding the need for complex invasive delivery systems.
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 effectively slows, arrests, or confines SD wave propagation, providing a potential treatment and prevention method for disorders related to SD, with surface positive polarization being effective in arresting SD propagation and surface negative polarization in confining it to superficial layers.
Implementation Method 1
polarization of the cortical tissue parallel to the direction of a propagating SD wave increased the conduction velocity of SD when the polarization direction was positive to negative in the direction of propagation
Implementation Method 2
This suggested that the propagation is mediated by the movement of positively charged ions such as potassium
Implementation Method 3
the effects of transcortical DC polarization on SD have not been systematically explored
Implementation Method 4
surface positive polarization arrests SD propagation and surface negative polarization confines it to superficial layers
Data Source
AI summary
The present invention provides devices and methods for modulating spreading depression in the brain.