Dielectric-Anisotropic Electrode Structure for TTFields Skin Conformability

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Solution Overview

Problem

Existing TTFields therapy apparatuses face challenges with the fragility and high cost of high dielectric constant polymer films used as dielectric material, which are prone to piercing during manufacturing and require expensive materials, and lack sufficient coverage to maintain effective capacitive contact.

Innovation Solution

The apparatus incorporates a layer of anisotropic material to protect and increase the area of dielectric material contact, allowing for the use of cheaper materials like Al2O3 and polymer films, enhancing flexibility and durability while maintaining capacitive contact.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If high dielectric constant polymer films are used as dielectric material, then capacitive contact effectiveness is improved, but manufacturing difficulty increases due to fragility and piercing susceptibility

Engineering Contradiction:

Improvecapacitive contact effectivenessVSAvoidmanufacturing difficulty

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent uses a composite structure combining a flexible substrate layer with a dielectric material layer (such as Al2O3 or polymer films). This composite approach allows the dielectric material to be supported by the flexible substrate, preventing piercing during manufacturing while maintaining capacitive contact effectiveness. The flexible substrate acts as a mechanical support that distributes stress and protects the dielectric layer.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent employs flexible substrate layers and thin film dielectric materials that can conform to skin surfaces. These flexible structures are less prone to piercing during manufacturing and application compared to rigid high dielectric constant materials. The flexibility allows the apparatus to adapt to body contours while maintaining electrical contact.

Inventive Principle:

Principle #30Flexible shells and thin films

2Reliability

If high dielectric constant polymer films are used, then capacitive contact effectiveness is improved, but material cost increases

Engineering Contradiction:

Improvecapacitive contact effectivenessVSAvoidmaterial cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent utilizes cheaper dielectric materials such as aluminum oxide (Al2O3) and standard polymer films that can be applied as disposable or reusable electrode assemblies. These materials provide sufficient dielectric properties for TTFields therapy at a lower cost compared to high dielectric constant polymers, making the therapy more economically viable.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

By combining flexible substrates with cost-effective dielectric materials like Al2O3 coatings or standard polymers, the patent achieves a balance between capacitive effectiveness and material cost. The composite structure compensates for the lower dielectric constant of cheaper materials through optimized geometry and contact area.

Inventive Principle:

Principle #40Composite materials

3Reliability

If dielectric material coverage area is increased, then capacitive contact effectiveness is improved, but device flexibility decreases

Engineering Contradiction:

Improvecapacitive contact effectivenessVSAvoidflexibility

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent uses flexible substrate layers and thin film dielectric materials that can conform to skin surfaces. These flexible structures allow the dielectric material to cover a large area while maintaining flexibility and adaptability to body contours. The thin film construction prevents rigidity issues that would arise from thick or extensive dielectric material coverage.

Inventive Principle:

Principle #30Flexible shells and thin films

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 configuration improves manufacturing ease and reduces costs while ensuring effective capacitive contact and better conformability to the skin, allowing for safer and more efficient delivery of TTFields therapy.

Implementation Method 1

The layer of dielectric material contacts at least a first layer of the at least one layer of anisotropic material to form a capacitive structure

Methodology Applied

Scientific EffectCapacitance: Capacitance

Data Source

PatentUS12496438B2Apparatus comprising dielectric layer coupled to anisotropic layer

Publication Date: 2025.12.16 NOVOCURE GMBH

AI summary

An apparatus includes an outer adhesive layer comprising a conductive gel or conductive adhesive, at least one layer of anisotropic material, a layer of dielectric material, and a skin contact layer comprising a conductive gel or conductive adhesive. The at least one layer of anisotropic material and the layer of dielectric material are positioned between the outer adhesive layer and the skin contact layer. The layer of dielectric material contacts at least a first layer of the at least one layer of anisotropic material to form a capacitive structure.