Modular Electrode Assembly for TTFields with Separation Detection

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Solution Overview

Problem

Conventional electrode assemblies for applying Tumor Treating Fields (TTFields) are integrated units that must be applied or removed as a whole, lacking modular subassemblies that can ensure continuous contact and alignment during use.

Innovation Solution

The development of a modular apparatus comprising two subassemblies, where one subassembly includes a conductive layer, electrode elements, and conductive terminals, and the other subassembly includes a conductive adhesive or gel layer for skin contact, ensuring continuous contact and alignment through electrical and optical detection methods.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If electrode assemblies are designed as single integrated units, then manufacturing and application are simplified, but the ability to ensure continuous contact and alignment during use is reduced

Engineering Contradiction:

Improveease of applicationVSAvoidcontinuous contact and alignment

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The electrode assembly is divided into two separate subassemblies (first subassembly with electrode elements and second subassembly with conductive adhesive layer) that can be independently manufactured and then coupled together. This segmentation allows each subassembly to be optimized for its specific function while maintaining the overall reliability of continuous contact through the coupling mechanism with conductive terminals.

Inventive Principle:

Principle #1Segmentation

2Reliability

If electrode assemblies are divided into modular subassemblies, then continuous contact and alignment can be ensured, but device complexity increases

Engineering Contradiction:

Improvecontinuous contact and alignmentVSAvoidmodular structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The two separate subassemblies are merged into a single functional unit through the coupling mechanism where conductive terminals on the first subassembly contact with the conductive adhesive layer on the second subassembly. This merging ensures continuous electrical contact and proper alignment while maintaining the benefits of modular design for manufacturing and application.

Inventive Principle:

Principle #5Merging (Combining)

3Ease of operation

If conventional integrated electrode assemblies are used, then application procedure is simple, but safety issues arise from potential separation during use

Engineering Contradiction:

Improveapplication procedureVSAvoidsafety issues from separation

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The coupling mechanism between subassemblies incorporates conductive terminals that provide electrical continuity feedback to indicate proper contact and alignment. This feedback mechanism ensures that the electrode assembly is correctly applied and remains connected during use, preventing separation-related safety issues while maintaining a relatively simple application procedure.

Inventive Principle:

Principle #23Feedback

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 modular design ensures reliable application of alternating electric fields by maintaining continuous contact and alignment between subassemblies, preventing safety issues and enhancing the efficacy of TTFields treatment.

Implementation Method 1

The at least one intermediate layer of material is configured to either (a) capacitively couple each of the electrode elements to the first layer of conductive material or (b) conductively couple each of the electrode elements to the first layer of conductive material

Methodology Applied

Scientific EffectCapacitive coupling: Capacitance

Implementation Method 2

Methodology Applied

Scientific EffectConductive coupling: Conduction (electrical)

Implementation Method 3

The third layer of conductive material is positioned at the front of the second subassembly in electrical contact with the second layer of conductive material, and the third layer of conductive material is configured to adhere to skin

Methodology Applied

Scientific EffectAdhesion: Adhesive

Data Source

PatentUS20250108217A1Applying an Electrical Signal Using a Multi-Part Electrode Assembly, and Interrupting the Electrical Signal if the Parts Begin to Separate

Publication Date: 2025.04.03 NOVOCURE GMBH

AI summary

Alternating electric fields (e.g., tumor treating fields or TTFields) can be applied to a subject's body using electrode assemblies that are made from two discrete subassemblies, which are removably and adhesively connectable to each other. As long as the two subassemblies remain in intimate contact (which can be determined, e.g., by measuring an electrical resistance or an optical reflectance), the system applies an AC voltage to the electrode assemblies. But if (a) the subassemblies within any given electrode assembly become separated (or even begin to separate), or (b) the subassemblies within any given electrode assembly are not aligned correctly, then the system will turn off the AC voltage to that electrode assembly.