Stretchable Biomedical Electrode Pad for Reliable Signal Detection

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Solution Overview

Problem

Conventional biomedical electrode pads struggle to detect biological signals over a broad range due to restricted attachment sheet flexibility, leading to detachment during body movement and electrode connecting pattern breakage.

Innovation Solution

The biomedical electrode pad features an elastically stretchable, contractible, and bendable attachment sheet with electrode connecting wires that extend in a stretchable, contractible, and bendable manner, ensuring the pad remains attached to the skin and preventing electrode breakage during movement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of moving object

If the attachment sheet is made larger to broaden the range of detecting biological signals, then the detection range is improved, but the attachment sheet cannot follow changes in shape of the limb due to body movement and comes easily off the skin

Engineering Contradiction:

Improveattachment sheet areaVSAvoidattachment reliability

Core Design Contradiction:

Area of moving objectVSReliability

Solution Approach 1:

The patent applies the dynamics principle by making the attachment sheet elastically stretchable and the electrode connecting wires flexible, allowing the structure to dynamically adapt to changes in limb shape during body movement. This enables the enlarged attachment sheet to maintain reliable contact with the skin despite motion, resolving the contradiction between increased detection area and attachment reliability.

Inventive Principle:

Principle #15Dynamics

2Reliability

If the electrode connecting patterns are extended in a straight line to connect electrodes, then the electrical connection is improved, but the patterns undergo excessive local deformation and break easily during movement

Engineering Contradiction:

Improveelectrical connection reliabilityVSAvoidelectrode connecting pattern strength

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent applies the curvature principle by replacing straight-line electrode connecting patterns with bent or meandering wire configurations. This allows the electrical connections to accommodate deformation during movement without breaking, maintaining both electrical reliability and mechanical strength through increased flexibility and stress distribution.

Inventive Principle:

Principle #14Spheroidality (Curvature)

3Ease of manufacture

If the attachment sheet is restricted by electrode connecting patterns extended in a straight line, then the manufacturing is simplified, but the sheet fails to follow changes in shape of the limb due to body movement

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidshape adaptability

Core Design Contradiction:

Ease of manufactureVSAdaptability or versatility

Solution Approach 1:

The patent applies dynamics by transitioning from rigid straight-line patterns to flexible, elastically stretchable connection structures that can dynamically conform to changing limb shapes. This maintains manufacturing feasibility while dramatically improving shape adaptability during body movement.

Inventive Principle:

Principle #15Dynamics

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

This design allows the biomedical electrode pad to continuously detect biological signals for a long period, regardless of changes in limb shape due to body movement, by maintaining contact with the skin and preventing electrode damage.

Implementation Method 1

an adhesive surface, which is suitable to be attached to skin through adhesion, on the back surface side

Methodology Applied

Scientific EffectAdhesion: Adhesive

Implementation Method 2

detect biological electrical signals, such as electrocardiographic signals or myoelectric signals, from the skin

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Data Source

PatentEP3777670B1Combination of a bioelectrode pad and a biological signal processing device

Publication Date: 2025.04.23 NIPRO CORP

Figure 1(a)~1(c)
Figure 2
Figure 3(a)~3(b)

AI summary

Proposed is a biomedical electrode comprising: an attachment sheet being elastically stretchable and contractible and having an electrically insulating property that has on a back surface side, an adhesive surface suitable to be attached to the skin of a living body; a plurality of electrodes located apart from one another on the back surface side of the attachment sheet and exposed on the back surface side; a plurality of connecting parts located at a central part on the back surface side of the attachment sheet and covered with electrical insulation while being exposed toward a front surface side through openings of the attachment sheet; and electrode connecting wires located on the back surface side of the attachment sheet and covered with electrical insulation that electrically connect respective ones of the plurality of electrodes with corresponding ones of the plurality of connecting parts, wherein at least one of the electrode connecting wires extends in a stretchable, contractible, and bendable manner.