Nerve Cuff Electrode Surface Roughening for Delamination Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing nerve cuffs experience delamination at window frames due to poor bonding between conductive and non-conductive materials, leading to exposure of internal components to bodily fluids, which causes electrochemical oxidation and galvanic corrosion, and reduce effective charge density and stimulation effectiveness.
Innovation Solution
The nerve cuffs are manufactured by combining grit-blasted conductive members with a nerve cuff body, using different grit blasting parameters to expose portions of the conductive material within windows, and applying a second grit blasting process to remove contaminants, resulting in increased effective surface area and improved adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional bonding methods are used to combine conductive members with non-conductive layers, then the manufacturing process is simple, but delamination occurs at window frames due to poor bonding
Solution Approach 1:
The conductive member surfaces are grit-blasted before assembly to create a roughened surface that enhances bonding. This preliminary surface treatment ensures that when the non-conductive layers are bonded to the conductive members, the adhesion is significantly improved, preventing delamination at the window frames during subsequent manipulation and use.
Solution Approach 2:
The invention changes the surface parameters of the conductive members by applying grit blasting treatment. This modifies the surface roughness and increases the surface area, which fundamentally alters the bonding characteristics between the conductive members and non-conductive materials, transforming poor adhesion into strong bonding.
2Area of stationary object
If thin window frames are used to expose conductive members, then the effective surface area for stimulation is increased, but delamination and exposure of internal components occurs
Solution Approach 1:
The conductive members undergo grit blasting treatment before assembly, creating a roughened surface that provides mechanical interlocking with the non-conductive layers. This preliminary action ensures that even with thin window frames that maximize exposed surface area, the bonding remains strong enough to prevent delamination and protect internal components.
3Ease of manufacture
If smooth conductive surfaces are used, then manufacturing is easier, but effective charge density is reduced due to lower surface area
Solution Approach 1:
The invention changes the surface parameters of conductive members through grit blasting, transforming smooth surfaces into roughened surfaces with increased surface area. This parameter change directly increases the effective charge density available for neural stimulation while the roughened surface also improves bonding characteristics.
4Ease of operation
If internal components are exposed to bodily fluids, then access to conductive members is improved, but electrochemical oxidation and galvanic corrosion occur
Solution Approach 1:
The conductive members are pre-treated with grit blasting to create a roughened surface that enhances bonding with non-conductive protective layers. This preliminary bonding enhancement ensures that even when window frames provide exposure for electrical contact, the protective layers remain securely attached, preventing bodily fluids from reaching internal components and causing electrochemical degradation.
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 reduces delamination, increases stimulation energy delivery, and decreases electrode-electrolyte impedance, thereby reducing power consumption and tissue damage risks.
Implementation Method 1
The conductive members are grit blasted to roughen the surface and increase the effective surface area
Implementation Method 2
The roughened surface increases the effective surface area and improves adhesion
Data Source
AI summary
A method of forming a nerve cuff by combining a plurality of electrically conductive members with respective rear surfaces and grit blasted front surfaces with a nerve cuff body, which includes a respective plurality of windows, in such a manner that exposed portions of the grit blasted front surfaces are within the windows.