Porous Electrode Assembly with Insulating Segments for Neurostimulation
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Solution Overview
Problem
Current neurostimulation electrode assemblies, particularly for transcranial direct current stimulation (tDCS), often cause discomfort due to heat and uneven current distribution, leading to inefficiencies in delivering electrical current effectively.
Innovation Solution
The electrode assembly incorporates a substantially porous element with insulating members, such as rivets, exposed at the contact surface to prevent direct contact and facilitate even current distribution, along with a conductive rubber insert or metal material for enhanced current dispersion, and a porous material adapted to contain an electrolyte, optimizing the thickness and porosity for reduced discomfort and improved efficacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a continuous porous material is used for the electrode contact surface, then current distribution is improved, but heat generation and discomfort increase due to direct contact
Solution Approach 1:
The continuous porous contact surface is segmented by introducing insulating members (ridges, posts, or patterns) that divide the conductive surface into discrete regions. This segmentation maintains overall current distribution while creating insulating barriers that prevent excessive heat concentration and direct skin contact in specific areas, thereby reducing discomfort.
Solution Approach 2:
Insulating members are introduced as intermediary elements between the conductive porous material and the patient's skin. These intermediaries (ridges, posts, or patterned insulators) mediate the interaction by allowing beneficial current distribution while blocking harmful direct contact and heat transfer in specific zones.
2Object-affected harmful factors
If insulating members are added to the electrode assembly, then patient comfort is improved, but device complexity increases
Solution Approach 1:
The insulating members are merged with the porous contact surface structure itself, forming an integrated electrode assembly where insulating ridges, posts, or patterns are incorporated directly into the electrode body. This integration reduces the need for separate insulating components and simplifies the overall device structure.
Solution Approach 2:
The insulating members serve multiple functions simultaneously: they provide electrical insulation to reduce discomfort, maintain structural integrity of the electrode assembly, and can help distribute current more evenly across the contact surface. This multi-functionality reduces the need for additional specialized components.
3Object-affected harmful factors
If the porous material thickness is increased to reduce discomfort, then current distribution improves, but electrical resistance increases
Solution Approach 1:
The electrode assembly employs local quality variations by introducing insulating members at specific locations within the porous material. These localized insulating features create regions of different current density and thermal characteristics, allowing thick porous material for comfort while maintaining effective current delivery through strategically positioned conductive pathways.
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 solution minimizes patient discomfort and ensures a more even distribution of electrical current, enhancing the effectiveness of neurostimulation procedures like tDCS for treating psychological disorders and motor rehabilitation.
Implementation Method 1
The substantially porous material is configured to absorb and at least partially contain an electrolyte in liquid form
Implementation Method 2
conductive rubber insert or metal material for enhanced current dispersion
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
An electrode assembly includes a substantially porous element configured to be coupled to an electrode for delivery of electrical current to a patient in a neurostimulation procedure. The substantially porous material defining a contact surface, of which at least a portion contacts the patient during the neurostimulation procedure. A first insulating member is coupled to the substantially porous element and exposed at the contact surface to prevent a portion of the contact surface from contacting the patient to deliver the electrical current during the neurostimulation procedure.