3D Grounded Wall for FSCV Artifact Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Fast-scanning cyclic voltammetry (FSCV) induces significant artifacts in electrophysiological recordings due to volume conduction of currents in conductive brain tissue, complicating the acquisition of clean neural data and neurotransmitter signals, as previous techniques have been unable to effectively eliminate these artifacts from the device design stage.
Innovation Solution
A 3D reference/ground structure surrounding the FSCV electrode, fabricated with materials like gold, platinum, or PEDOT:PSS, is used to enclose the electrode currents, reducing artifacts by connecting the conductive wall to ground and optimizing its height and gap dimensions to minimize interference with nearby electrical recordings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If FSCV is used to monitor neurotransmitter dynamics, then high temporal resolution and selectivity are achieved, but significant artifacts are induced in nearby electrical recordings
Solution Approach 1:
A conductive wall structure is introduced as an intermediary element between the FSCV electrode and the surrounding brain tissue. This wall acts as a mediator that confines the electrical currents generated during FSCV scans, preventing them from propagating to nearby recording electrodes and causing artifacts, while allowing the FSCV measurement function to proceed unchanged.
Solution Approach 2:
The conductive wall is implemented as a thin film structure that surrounds the FSCV electrode. This thin conductive barrier effectively contains the voltage-induced currents within a localized region, preventing their spread to adjacent neural recording sites while maintaining the functional performance of the FSCV electrode.
2Object-generated harmful factors
If a conductive wall is introduced to reduce artifacts, then artifact suppression is achieved, but device complexity increases
Solution Approach 1:
The conductive wall structure serves multiple functions simultaneously: it confines FSCV-induced currents to reduce artifacts, provides a defined geometry for current distribution, and can be integrated with existing probe fabrication processes. This multi-functionality reduces the need for additional separate components to achieve artifact suppression.
3Object-generated harmful factors
If the conductive wall height is increased to better enclose currents, then artifact reduction improves, but the gap control becomes more difficult
Solution Approach 1:
The design optimizes specific geometric parameters of the conductive wall, including its height and the gap between the wall and electrode surface. By carefully selecting these parameters within specific ranges, the design achieves effective current confinement and artifact suppression while maintaining manufacturability and avoiding excessive complexity in fabrication.
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 3D reference/ground design significantly reduces FSCV-induced artifacts from approximately 5 mV to sub-μV levels, enabling cleaner electrical signals for concurrent electrophysiology and neurochemical sensing, facilitating neuroscience research and clinical applications by maintaining artifact-free neural probes.
Implementation Method 1
Due to the volume conduction of the currents induced by the applied voltage in the FSCV electrodes in conductive brain tissue
Implementation Method 2
The conductive wall and wire are disposed on the probe. The conductive wall is grounded and is disposed on the probe
Data Source
AI summary
A probe includes a fast-scanning cyclic voltammetry electrode, a conductive wall disposed around the fast-scanning cyclic voltammetry electrode, and a wire in electronic communication with the fast-scanning cyclic voltammetry electrode. The conductive wall is grounded. Fast scanning cyclic voltammetry electrode currents are enclosed within the conductive wall. Resulting fast scanning cyclic voltammetry can have sub-μV level artifacts.