Flexible TTFields Transducer Layer for Stable Skin Conformity

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Solution Overview

Problem

Existing transducer apparatuses for tumor treating fields (TTFields) face challenges in proper positioning due to body contours and movement, leading to detachment and reduced treatment effectiveness, and cause discomfort due to rigid anisotropic material layers and sharp edges.

Innovation Solution

Incorporating a flexible foam layer between the anisotropic material layer and the body, using slits or a central hole in the anisotropic material layer, and employing a conductive adhesive layer with anisotropic properties to spread current and heat evenly, reducing irritation and improving adherence.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a rigid anisotropic material layer is used in the transducer, then electrical conductivity and current distribution are improved, but flexibility and comfort are worsened

Engineering Contradiction:

Improveelectrical conductivityVSAvoidflexibility

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent combines a rigid anisotropic material layer with a flexible foam layer to create a composite structure. The anisotropic layer provides the necessary electrical conductivity and current distribution, while the flexible foam layer provides mechanical compliance and comfort. This composite approach allows each material to contribute its advantageous properties while mitigating their individual disadvantages.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The flexible foam layer acts as an intermediary between the rigid anisotropic material layer and the patient's body. It cushions the rigid layer, allowing the system to maintain electrical performance while adapting to body contours and movements, thus resolving the conflict between rigidity and flexibility.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the transducer is made firm to maintain positioning, then treatment effectiveness is improved, but comfort and adherence are worsened

Engineering Contradiction:

Improvepositioning stabilityVSAvoiddiscomfort

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent employs a flexible foam layer that can deform to match the patient's body contours while still providing a cushioning effect. This flexible structure maintains contact and positioning stability without the discomfort associated with rigid materials, allowing the transducer to adapt to various body shapes and movements.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The flexible foam layer provides beforehand cushioning by continuously adapting to body movements and contours. This cushioning effect prevents discomfort and skin irritation before they occur, while maintaining sufficient pressure for effective treatment delivery.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Reliability

If the anisotropic material layer is made thicker for better current distribution, then electrical performance is improved, but flexibility and adaptability are worsened

Engineering Contradiction:

Improvecurrent distributionVSAvoidflexibility

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent creates a composite structure where the anisotropic material layer (providing electrical performance) is combined with a flexible foam layer (providing adaptability). The foam layer compensates for the reduced flexibility caused by the thicker anisotropic layer, allowing the system to maintain both electrical performance and adaptability to body contours.

Inventive Principle:

Principle #40Composite materials

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

Enhances treatment effectiveness by maintaining proper positioning and reducing discomfort, allowing for consistent delivery of TTFields without exceeding skin temperature thresholds.

Implementation Method 1

employing a conductive adhesive layer with anisotropic properties to spread current and heat evenly

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

employing a conductive adhesive layer with anisotropic properties to spread current and heat evenly

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Implementation Method 3

Incorporating a flexible foam layer between the anisotropic material layer and the body

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS20250360306A1Flexible layer for use in a tumor treating fields transducer

Publication Date: 2025.11.27 NOVOCURE GMBH

AI summary

A transducer apparatus for delivering tumor treating fields to a subject's body, the transducer apparatus comprising an array of one or more electrode elements, the array configured to be positioned over the subject's body with a front face of the array facing the subject's body, an anisotropic material layer electrically coupled to the array and located on a front side of the front face of the array, the anisotropic material layer comprising a front face and a back face, the back face facing the array, and a flexible layer coupled to the front face of the anisotropic material layer and configured to contact the subject's body, wherein the flexible layer comprises a flexible material and, optionally, an adhesive.