Platinum Dendrite Microelectrodes for High-Resolution Neural Stimulation
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Solution Overview
Problem
Existing neural electrodes face challenges with increased electrode impedance and reduced capacitance due to miniaturization, limiting their clinical applications. They require multi-focus electrodes in a limited space to improve spatial resolution and reduce critical stimuli charge density.
Innovation Solution
A microelectrode design featuring a flexible layer, an electrically conductive layer, and platinum dendrite structures. The electrically conductive layer is partially revealed through grooves on the flexible layer, with each groove containing a platinum dendrite structure. This design increases the surface area and biocompatibility of the microelectrode, allowing for more recording points and improved electrical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the size of microelectrodes is reduced to improve spatial resolution, then the number of electrodes per unit area increases, but electrode impedance increases and capacitance decreases
Solution Approach 1:
The patent transitions from planar 2D electrode surfaces to 3D dendritic structures. The platinum dendrite structures extend vertically and laterally from the substrate, creating multiple surfaces within a small footprint. This dimensional transformation increases the effective surface area and electrical contact area without increasing the planar footprint, thereby improving charge storage capacity and reducing impedance while maintaining high spatial resolution
Solution Approach 2:
The dendritic structures create a porous, three-dimensional network of platinum formations. These porous structures provide increased surface area-to-volume ratio, allowing more active sites for electrochemical reactions. The interconnected dendritic network maintains electrical continuity while providing enhanced charge storage capacity and reduced impedance compared to flat surfaces
2Measurement precision
If the number of electrodes is increased in a limited space to improve spatial resolution, then electrode spacing decreases, but critical stimuli charge density increases
Solution Approach 1:
By extending electrodes vertically into dendritic structures, the patent distributes the charge delivery across multiple surfaces at different heights and positions. This three-dimensional charge distribution reduces the charge density at any single point on the electrode-nerve interface, allowing higher electrode density without increasing critical stimuli charge density
Solution Approach 2:
The dendritic structures segment the electrode surface into numerous smaller contact points distributed throughout the three-dimensional structure. Each dendrite tip and surface segment acts as an independent or semi-independent stimulation site, distributing the total stimulation charge across many segments rather than concentrating it on a single planar surface
Data Source
AI summary
The present invention provides a microelectrode, comprising a flexible layer, an electrically conductive layer and a plurality of platinum dendrite structures, wherein the electrically conductive layer is arranged in the flexible layer, and wherein on the surface of the flexible layer are a plurality of grooves within which the electrically conductive layer is revealed partially, and wherein each of the groove is provided with one platinum dendrite structure therein. The plurality of grooves serve as focal electrodes distributed uniformly, with smaller electrode sites and more recording points. The modified platinum dendrite structures increase the surface area, electrical performance, biocompatibility and service life of the microelectrode. Besides, creating virtual electrodes by current steering technique increases the number of stimuli received by microelectrode during use, and improves its resolution in applications.