Hydrogel Electrode Patch Array for Accurate Nerve Signal Placement
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Solution Overview
Problem
Conventional electrode placement methods for nerve conduction studies suffer from anatomical variability, leading to positioning errors that cause increased electrical current requirements, patient discomfort, and reduced signal quality due to unintentional stimulation of surrounding tissues.
Innovation Solution
An electrode patch with a flexible substrate and an array of hydrogel electrodes featuring raised geometries, optionally with an adhesive layer and intermediate layer, designed to closely contact the skin and minimize placement errors, combined with an electronics module for precise stimulus delivery and signal recording.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional flat metal or gel disc electrodes are used, then ease of manufacture is improved, but electrode positioning accuracy deteriorates due to anatomical variability
Solution Approach 1:
The patent divides the electrode interface into multiple discrete electrode sites arranged in an array on a flexible substrate. Each electrode is a separate element that can be independently positioned, allowing the nerve to contact one or more specific electrodes rather than requiring precise placement of a single large electrode. This segmentation enables tolerance for positioning variability while maintaining measurement accuracy.
Solution Approach 2:
The patent transitions from traditional single-point or bipolar electrode placement to a two-dimensional array of multiple electrodes on a flexible substrate. This dimensional expansion allows the system to capture spatial distribution of electrical signals across the nerve, converting a positioning precision problem into a spatial mapping opportunity where the nerve's natural contact point becomes the measurement target rather than the placement target.
2Ease of operation
If larger electrode size is used to increase the chance of nerve contact, then ease of operation is improved, but measurement precision deteriorates due to reduced sensitivity to localized signals
Solution Approach 1:
The large electrode area is segmented into multiple smaller electrode sites arranged in an array. Each individual electrode maintains small size for high spatial resolution and sensitivity, while the collective array covers a larger area to increase the probability of nerve contact. This segmentation allows the system to benefit from both small electrode sensitivity and large coverage without compromise.
Solution Approach 2:
The patent combines multiple small electrodes into a unified array system that functions as both a high-resolution measurement tool and a large-area contact interface. By merging the signals from multiple electrodes or selecting the optimal contact electrode, the system achieves both the sensitivity of small electrodes and the operational ease of large electrodes.
3Ease of manufacture
If traditional stimulating electrodes are used, then ease of manufacture is improved, but harmful factors increase due to unintentional stimulation of surrounding tissue
Solution Approach 1:
The patent employs multiple small electrodes with localized current delivery capability rather than a single large electrode that disperses current over a broad area. This local quality approach allows current to be concentrated at the specific electrode-nerve contact point, minimizing current spread to surrounding non-target tissues and reducing unwanted stimulation while maintaining effective stimulation at the target site.
Data Source
AI summary
Systems, devices, and methods for interfacing with biological tissue are described herein. An example electrode patch as described herein includes a flexible substrate and an electrode array arranged on the flexible substrate. The electrode array includes a plurality of electrodes, where each of the plurality of electrodes is formed of a hydrogel. Additionally, each of the plurality of electrodes defines a raised geometry. Additionally, an example system includes the electrode patch, which is configured to interface with a subject's skin, and an electronics module operably coupled to the electrode array.