Medical Electrode Lateral Conductivity Control
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Solution Overview
Problem
Conventional medical electrodes often cause skin irritation and 'hot spots' due to inadequate flexibility and uneven electrode-skin contact, leading to discomfort and potential burns during nerve and muscle stimulation, as they compromise flexibility to achieve uniform current distribution.
Innovation Solution
A medical electrode with a moderately conductive flexible member, featuring a conductive ink pattern on the bottom side and a moderately high conductivity adhesive, allowing for automated assembly and controlled current density, along with mechanical control of lateral conductivity through cutouts, enabling flexible and even current distribution without edge interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If metallic mesh or foil is used to provide conductivity, then current density can be controlled, but flexibility is compromised and burning or hot spots occur at electrode edges
Solution Approach 1:
The electrode is divided into multiple independent conductive elements (foils or sheets) that can be individually positioned and shaped. This segmentation allows each element to conform to skin contours while maintaining controlled current density distribution, preventing the hot spots that occur with continuous metallic mesh or foil
Solution Approach 2:
Different regions of the electrode have different conductive properties. The conductive elements are strategically placed and shaped to provide appropriate conductivity in specific areas, allowing uniform current distribution across the electrode surface while maintaining flexibility and preventing edge-related burning
2Ease of operation
If electrode is made flexible to conform to skin contours, then comfort and contact are improved, but uniform current distribution becomes difficult to achieve
Solution Approach 1:
The electrode consists of multiple separate conductive foils or sheets rather than a single continuous conductive layer. Each segment can independently conform to skin contours, and their collective arrangement maintains uniform current distribution across the entire electrode surface
Solution Approach 2:
The electrode combines flexible non-conductive materials (foils or sheets) with conductive elements in a composite structure. This allows the electrode to maintain flexibility for skin conformability while the conductive elements ensure uniform current distribution, resolving the contradiction between flexibility and current uniformity
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 solution provides uniform current distribution across the electrode surface, reducing the risk of skin irritation and burns, while allowing for flexible placement of connectors and improved manufacturing efficiency, ensuring optimal patient stimulation or recording.
Implementation Method 1
a highly conductive pattern, such as, for example conductive ink, printed or transferred to the member bottom side
Implementation Method 2
A conductive adhesive of moderately high conductivity is disposed on the flexible member bottom side
Implementation Method 3
for adhering the electrode to a patients' skin
Data Source
AI summary
A medical electrode includes a moderately conductive flexible member having a top side and a bottom side with a connector and contact with a flexible member top side for establishing electrical contact with an external apparatus. An oversize non-conductive flexible sheet covers the conductive flexible member top and the connector and a highly conductive ink pattern is disposed on a conductive flexible member bottom side. A moderately high conductive hydrogel adhesive disposed on the conductive flexible member bottom side and covering the conductive ink pattern is provided for adhering the electrode to a patient's skin. Lateral conductivity and conformability of the electrode is controlled by cutouts in and thickness of the conductive flexible member and/or the conductive adhesive.