Shiftable Transducer Array With Anisotropic Layer for Skin Hot Spots

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Solution Overview

Problem

Conventional transducer arrays for tumor treating fields (TTFields) cause skin irritation and uneven current distribution, leading to hot spots and reduced maximum operational current, which limits the strength of the TTFields.

Innovation Solution

Incorporating an anisotropic material layer with a central hole and a foam layer to spread heat and current evenly, reducing skin irritation and enhancing flexibility, thereby increasing the maximum operational current and TTField strength.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional transducer arrays with ceramic disks are used, then TTFields can be generated, but skin irritation and uneven current distribution occur leading to hot spots

Engineering Contradiction:

ImproveTTField generationVSAvoidskin irritation and hot spots

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

An anisotropic material layer is introduced as an intermediary between the ceramic electrode disks and the patient's skin. This layer has directionally dependent electrical conductivity that spreads the current laterally, reducing concentration at any single point and thereby eliminating hot spots and skin irritation while maintaining effective TTField generation.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The electrical conductivity parameters of the transducer assembly are modified by introducing the anisotropic material layer. This layer has different conductivity values in different directions (higher lateral conductivity, lower vertical conductivity), which changes how current distributes through the assembly, spreading it evenly across the skin surface rather than concentrating it at electrode contacts.

Inventive Principle:

Principle #35Parameter changes

2Power

If higher current is applied to increase TTField strength, then treatment effectiveness improves, but skin irritation and hot spots worsen

Engineering Contradiction:

ImproveTTField strengthVSAvoidskin irritation

Core Design Contradiction:

PowerVSObject-affected harmful factors

Solution Approach 1:

The anisotropic material layer acts as a current-distributing intermediary that allows higher total current to be applied without increasing local current density at the skin interface. The lateral conductivity of the anisotropic layer spreads the current across a wider area, decoupling the relationship between total power and local heat generation.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Manufacturing precision

If rigid transducer arrays are used, then manufacturing precision is improved, but adaptability to patient's body surface deteriorates

Engineering Contradiction:

Improvearray alignmentVSAvoidbody surface conformity

Core Design Contradiction:

Manufacturing precisionVSAdaptability or versatility

Solution Approach 1:

The transducer assembly uses a composite structure combining rigid ceramic electrode disks with a flexible anisotropic material layer. The rigid ceramic elements maintain precise electrode positioning and array geometry for manufacturing accuracy, while the flexible anisotropic layer conforms to the patient's body surface contours, enabling adaptability without sacrificing precision.

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

The anisotropic material layer with a central hole and foam layer alleviate skin irritation and improve current distribution, allowing for higher TTField strength and consistent treatment delivery.

Implementation Method 1

the anisotropic material layer with a central hole and foam layer alleviate skin irritation and improve current distribution

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

improve current distribution, allowing for higher TTField strength

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Implementation Method 3

enhancing flexibility, thereby increasing the maximum operational current

Methodology Applied

Scientific EffectElastic deformation: Elasticity

Data Source

PatentUS20260034376A1Shiftable transducer array with anisotropic material layer and foam layer

Publication Date: 2026.02.05 NOVOCURE GMBH

AI summary

A transducer apparatus for delivering tumor treating fields to a subject's body, the transducer apparatus including: an array of electrodes, the array configured to be positioned over the subject's body with a front face of the array facing the subject's body, the array comprising electrode elements; an anisotropic material layer electrically coupled to the array of electrodes 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 of electrodes, the anisotropic material layer further including a hole passing through the front face and the back face of the anisotropic material layer; and a foam layer coupled to the front face of the anisotropic material layer and covering the hole on the front face of the anisotropic material layer.