Medical Electrode with Conductive Ink Pattern for Uniform Current Distribution

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Solution Overview

Problem

Medical electrodes face challenges in providing uniform electrical distribution over curved body surfaces, leading to skin irritation and 'hot spots' due to inadequate flexibility and uneven electrode-skin contact, which can result in rashes or burning sensations during nerve and muscle stimulation.

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 a connector on the top side, enabling automated assembly and controlled current density distribution without interference from lead wires, and incorporating a border design for current roll-off prevention.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If a metallic mesh or foil is used to provide conductivity, then current density can be controlled, but the electrode loses flexibility and causes burning or hot spots at edges

Engineering Contradiction:

Improvecurrent density controlVSAvoidelectrode flexibility

Core Design Contradiction:

Manufacturing precisionVSAdaptability or versatility

Solution Approach 1:

The patent changes the conductivity parameter from high (metallic mesh/foil) to moderate (conductive fabric with resistivity of 10^-2 to 10^6 ohms per square), eliminating the need for complex mesh structures while maintaining current distribution control and preserving flexibility

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses a composite structure combining conductive fabric with conductive adhesive, creating a flexible yet electrically functional electrode that avoids the rigidity of metallic foils while maintaining effective current distribution

Inventive Principle:

Principle #40Composite materials

2Reliability

If conductive adhesive with high conductivity is used, then electrical coupling is improved, but current distribution becomes uneven causing hot spots

Engineering Contradiction:

Improveelectrical couplingVSAvoidhot spots

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent specifies a moderate conductivity range for the conductive adhesive (10^-2 to 10^6 ohms per square), which is sufficiently conductive for electrical coupling but not so conductive as to create current concentration and hot spots at electrode edges

Inventive Principle:

Principle #35Parameter changes

3Ease of manufacture

If manual assembly is used for electrode construction, then flexibility in assembly is maintained, but unit cost increases and productivity decreases

Engineering Contradiction:

Improveassembly flexibilityVSAvoidunit cost and production efficiency

Core Design Contradiction:

Ease of manufactureVSProductivity

Solution Approach 1:

The patent divides the electrode into separable components (conductive fabric, conductive adhesive, connector) that can be assembled through automated processes, reducing manual labor while maintaining manufacturing quality

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent inverts the traditional assembly approach by placing the connector on the front surface rather than requiring backside assembly, enabling automated pick-and-place manufacturing processes

Inventive Principle:

Principle #13The other way round (Inversion)

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 edge effects and preventing skin irritation, while allowing flexible connector placement and enhanced manufacturing efficiency, ensuring effective patient stimulation or signal recording.

Implementation Method 1

a highly conductive pattern, such as, for example conductive ink, printed or transferred to the member bottom side

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Implementation Method 2

A conductive adhesive of moderately high conductivity is disposed on the flexible member bottom side and covering the conductive pattern for adhering the electrode to a patients' skin

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Data Source

PatentUS7769473B2Medical electrode with indicia

Publication Date: 2010.08.03 AXELGAARD MANUFACTURING COMPANY INC

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. A 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 cover the conductive ink pattern is provided for adhering electrode to a patients' skin.