Flexible TTField Conductive Pad Structure for Heat and Conformity
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Solution Overview
Problem
Existing transducer arrays for Tumor Treating Fields (TTFields) become uncomfortable due to heating and are inflexible, leading to reduced treatment duration and effectiveness.
Innovation Solution
Development of flexible conductive pads with air-channels and non-conductive layers to reduce heat buildup and improve array flexibility, using conductive gels with bulk electron transport agents for enhanced conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If current is applied to transducer arrays for extended treatment duration, then treatment effectiveness is improved, but electrode temperature increases causing patient discomfort and pain
Solution Approach 1:
The patent introduces a thermally conductive layer as an intermediary between the electrode and the patient's skin. This layer acts as a heat sink and thermal management interface, allowing heat to be conducted away from the electrode more efficiently while maintaining electrical contact. The thermally conductive layer mediates the thermal interaction between the heating electrode and the patient's tissue, preventing excessive temperature buildup at the skin interface.
Solution Approach 2:
The patent changes the thermal parameters of the electrode system by adding materials with specific thermal conductivity properties. The electrode assembly is modified to include layers with different thermal conductivities, transforming the thermal management characteristics of the system. This allows the electrode to dissipate heat more effectively while maintaining the electrical parameters needed for TTField generation.
2Reliability
If rigid ceramic electrodes are used to ensure patient safety, then DC signal blocking is achieved, but array flexibility and ability to contour to patient body is reduced
Solution Approach 1:
The patent segments the electrode structure into multiple functional layers: a flexible substrate layer, a conductive layer, and a non-conductive ceramic layer. This segmentation allows each layer to perform its specific function - the flexible substrate provides adaptability, the conductive layer enables current flow, and the ceramic layer ensures safety by blocking DC signals. The segmented structure resolves the contradiction by distributing functions across separate layers rather than requiring a single material to fulfill all requirements.
Solution Approach 2:
The patent creates a composite electrode structure combining materials with different properties - flexible polymers for adaptability, conductive materials for electrical performance, and non-conductive ceramic for safety. This composite construction allows the electrode assembly to simultaneously achieve flexibility for body contouring and DC blocking for patient safety, as each material contributes its unique properties to the overall system performance.
3Power
If current density is increased to enhance TTField generation, then treatment efficacy is improved, but heat generation and electrode overheating worsen
Solution Approach 1:
The thermally conductive layer serves as a thermal intermediary that facilitates heat transfer away from the electrode interface. By introducing this intermediate layer with optimized thermal conductivity, the system can manage the thermal byproduct of high-power operation more effectively, allowing higher current densities to be applied without excessive heat buildup at the patient interface.
Solution Approach 2:
The patent replaces passive thermal management (relying on natural heat dissipation) with an active thermal conduction system through the thermally conductive layer. This substitution enables more efficient heat removal, allowing the system to operate at higher power levels where the enhanced thermal conduction pathway prevents dangerous temperature accumulation.
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 flexible conductive pads maintain effective TTField generation while reducing patient discomfort and extending treatment duration without overheating.
Implementation Method 1
The conductive gel element is configured to be in contact with a patient's skin and receive an electrical current from the electrode element
Implementation Method 2
flexible conductive pads with air-channels and non-conductive layers to reduce heat buildup
Implementation Method 3
The nonconductive ceramic material is a safety feature to ensure that direct-current signals are blocked from unintentionally being transmitted to the patient by mistake
Implementation Method 4
Tumor Treating Fields (TTFields or TTFs) are low intensity (e.g., 1-3 V/cm) alternating electric fields within the intermediate frequency range (100-576 kHz) that target solid tumors by disrupting mitosis
Data Source
AI summary
A conductive pad is described. The conductive pad includes a topcoat layer, an electrode element, and a conductive gel element. The topcoat layer is constructed of a non-conductive material. The electrode element has a first side and a second side, the second side connected to the topcoat layer, and configured to receive an electrical signal from a generator producing an electric signal as a TTField. The conductive gel element is connected to the first side of the electrode element and electrically coupled to the electrode element so as to receive an electrical current from the electrode element, the conductive gel element being in the form of at least one line and operable to be in contact with a patient's skin at specific locations and operable to flex with movement of the patient without substantially moving from the specific location.