Neurostimulation Electrode Assembly With Enlarged Stimulation Surface
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Solution Overview
Problem
Existing electrode assemblies for neurostimulation face challenges in generating a strong electrical field without causing tissue damage, particularly due to electrochemical processes and inadequate signal-to-noise ratios, and require invasive implantation methods.
Innovation Solution
The electrode assembly features a stimulation surface of at least 50 mm², surrounded by an insulating carrier material, with a fixing structure and conductor connections designed to minimize electrochemical damage and improve signal quality, allowing for less invasive implantation between the skull and scalp.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the electrode surface area is increased to generate a strong electrical field, then the electrical field strength is improved, but the current density decreases which may reduce stimulation effectiveness
Solution Approach 1:
The electrode body implements local quality by having a stimulation surface with non-uniform properties - specifically, a rough or pimpled surface structure in the stimulation region while maintaining a smooth surface elsewhere. This local surface modification increases the effective stimulation surface area and reduces current density at the stimulation interface without compromising the overall electrical field generation capability. The insulating carrier material also provides local insulation quality to prevent current leakage.
Solution Approach 2:
The patent applies parameter changes by modifying the surface topology of the electrode body - transitioning from a smooth surface to a rough or pimpled surface structure. This surface treatment changes the effective surface area parameter, allowing the electrode to achieve both strong electrical field generation and reduced current density through the increased effective contact area with the tissue.
2Power
If the electrode surface area is increased to compensate for skull attenuation, then the electrical field penetration is improved, but the risk of electrochemical damage to the electrode increases
Solution Approach 1:
The patent uses parameter changes by implementing surface treatment that increases the effective surface area of the electrode body. This surface modification (rough or pimpled structure) allows the electrode to achieve sufficient current density for effective stimulation while distributing the current over a larger effective area, thereby reducing electrochemical damage and improving electrode durability during long-term operation.
Solution Approach 2:
The electrode assembly employs composite materials by combining the conductive electrode body material with an insulating carrier material. This composite structure provides both the electrical conductivity needed for stimulation and the insulation necessary to prevent current leakage and reduce electrochemical side reactions, thereby improving overall system reliability and electrode durability.
3Reliability
If a large stimulation surface is used to reduce current density, then electrochemical processes are reduced, but the signal-to-noise ratio may deteriorate
Solution Approach 1:
The electrode body implements local quality through surface treatment that creates a rough or pimpled structure specifically at the stimulation surface. This local modification increases the effective surface area to reduce current density and electrochemical damage, while the structured surface also enhances the signal-to-noise ratio by improving the electrode-tissue interface contact and reducing noise through the surface topology.
4Object-affected harmful factors
If the electrode assembly is made less invasive for implantation, then patient comfort and safety are improved, but the stability and fixation of the electrode may be compromised
Solution Approach 1:
The electrode assembly employs flexible shells and thin films by using a thin, flexible insulating carrier material that can conform to the curved surface of the skull. This flexible structure allows for less invasive implantation between the skull and scalp while maintaining stable fixation through the flexibility and adaptability to the implantation site, preventing displacement without requiring invasive anchoring mechanisms.
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 provides a strong electrical field with reduced tissue damage and improved signal-to-noise ratio, enabling less invasive neurostimulation with enhanced durability and comfort.
Implementation Method 1
The electrode body (20) has a stimulation surface (15), which is designed to be brought into contact with the tissue of the living being in order to generate an electrical stimulation of the tissue by alternating-current pulses and/or direct-current pulses
Implementation Method 2
The electrical field generated by the electrode body of an electrode assembly is attenuated by the skull of the living being
Data Source
AI summary
The invention relates to an electrode body (20) of an electrode assembly for electrically stimulating tissue of a living being, more particularly for neurostimulation. The electrode body (20) is designed to be arranged at a point between the skull and the scalp of a living being. The electrode body (20) has a stimulation surface, which is designed to be brought into contact with the tissue of the living being in order to produce an electrical stimulation of the tissue by alternating-current pulses and/or direct-current pulses. The electrode body (20) has a stimulation surface having an area of at least 50 mm2, a stimulation surface having an area of at least 20 mm2 and additionally a surface treatment which enlarges the effective stimulation surface, a fastening structure for fastening the electrode body (20) to the tissue of a living being, a conductor connection point, by means of which the electrode body (20) can be connected, by soldering, adhesive bonding, welding or another connection technique, to an electrical conductor (4) for electrically connecting the electrode body (20) to an electrical device or another electrode body (20). Except for the stimulation surface, the electrode body (20) is completely surrounded by an electrically insulating carrier maternal (6), and/or the electrode body (20) has cut-outs (16) distributed over the circumference for fastening the electrode body (20) in a carrier material (6) The invention further releases to electrode assemblies and to a method for producing an electrode assembly.