Black Silicon Nanopatterned Electrodes for Neural Stimulation
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Solution Overview
Problem
Current technologies for bladder volume monitoring and neural stimulation face challenges such as biofouling, signal drift, power consumption, and limited spatial selectivity, which hinder their effectiveness for chronic use.
Innovation Solution
The development of nano-patterned surface electrodes made of black silicon (BSi) with a conductive coating, which significantly reduces electrode impedance, enabling miniaturization and reducing tissue inflammation, and the use of custom-made nanopatterned electrodes that improve signal-to-noise ratio and charge injection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional electrodes are used for neural stimulation, then the device structure is simple, but the spatial selectivity is limited and tissue inflammation occurs
Solution Approach 1:
The patent transforms the electrode surface from a conventional flat 2D structure to a 3D nanopatterned structure with vertical nanoscale features. This dimensional transition increases the effective surface area and enables spatially selective stimulation by creating distinct nanoscale regions that can target specific neural populations, thereby resolving the contradiction between spatial selectivity and structural simplicity.
Solution Approach 2:
The patent modifies the physical parameters of the electrode surface by introducing nanoscale patterns with controlled dimensions, densities, and geometries. These parameter changes at the nanoscale level enhance spatial selectivity and reduce tissue inflammation while maintaining overall device structural simplicity, addressing the technical contradiction through precise parameter optimization.
2Reliability
If conventional electrodes are used, then the device is easy to manufacture, but biofouling and signal drift occur over time
Solution Approach 1:
The patent employs nanopatterned surfaces with porous or textured structures that reduce biofouling by minimizing protein adsorption and cell adhesion. The increased surface area-to-volume ratio and controlled pore structures prevent biofilm formation, thereby improving signal stability over time while using fabrication processes compatible with standard semiconductor manufacturing techniques.
Solution Approach 2:
The patent utilizes composite structures combining semiconductor materials with conductive coatings and nanopatterned surfaces. This composite approach enhances signal stability by reducing biofouling and improving electrical contact, while the fabrication process integrates multiple material deposition and patterning steps that are manufacturable using established industrial processes.
3Power
If electrode surface area is increased to reduce impedance, then the charge injection capacity improves, but the device size increases
Solution Approach 1:
The patent resolves this contradiction by transitioning from a 2D electrode surface to a 3D nanopatterned structure. The vertical nanoscale features increase the effective surface area and charge injection capacity without expanding the lateral footprint of the electrode, enabling high power performance in a compact form factor.
Solution Approach 2:
The patent implements nested structures where nanoscale features are embedded within the electrode geometry. This nesting approach packs increased surface area within the same footprint by creating hierarchical structures that utilize vertical space, thereby improving charge injection capacity without increasing the overall device size.
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 nano-patterned electrodes achieve stable and chronic bladder volume monitoring and spatially selective neural stimulation, reducing biofouling and signal degradation, and enabling high-resolution stimulation with improved electrode stability.
Implementation Method 1
a nano-patterned semiconductor layer on a frontside of the substrate
Implementation Method 2
a frontside conductive layer on the nano-patterned semiconductor layer
Data Source
AI summary
A sensor is described. The sensor includes a nano-patterned semiconductor layer on a frontside of a substrate. The sensor also includes a frontside conductive layer on the nano-patterned semiconductor layer on the frontside of the substrate. The sensor further includes a backside conductive layer on a backside of the substrate, distal from the frontside conductive layer.