Tumor Treating Electrode Arrays With Frequency Rotation for Heat Control
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Solution Overview
Problem
Existing TTF systems face inefficiencies due to fixed electrode arrays delivering therapy from limited angles and reactive heat management, leading to reduced efficacy and prolonged shutdowns, which affect the effectiveness of tumor reduction.
Innovation Solution
Adaptive TTF therapy that dynamically adjusts electrode activation configurations, including frequency rotation between 200 kHz and 150 kHz, and real-time temperature monitoring to optimize electrode firing sequences, ensuring effective tumor treatment while managing heat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TTF intensity is increased to 2.35 V/cm to kill more cancer cells, then tumor reduction efficacy is improved, but heat generation increases causing system shutdowns
Solution Approach 1:
The system dynamically adjusts electrode activation configurations in real-time based on temperature feedback. When temperature thresholds are approached, the system changes which electrodes are active, distributing heat generation across different electrode sets over time. This allows the system to maintain high intensity therapy (2.35 V/cm) for maximum tumor reduction while preventing sustained overheating through adaptive reconfiguration.
Solution Approach 2:
The system changes operational parameters by rotating through multiple electrode activation configurations. Each configuration delivers TTF at therapeutic intensity but with different spatial distribution of electromagnetic fields. By cycling through these configurations, the system maintains effective treatment intensity while varying the thermal load pattern, preventing localized heat accumulation that would trigger shutdowns.
2Device complexity
If fixed electrode arrays are used to deliver TTF, then device complexity is reduced, but treatment coverage from multiple angles is limited
Solution Approach 1:
The system uses fixed physical electrode arrays but dynamically changes which electrodes are activated and how they are grouped. The controller rotates through multiple activation configurations, effectively changing the therapeutic angle and field distribution without moving the physical arrays. This provides multi-angle treatment coverage while maintaining the simplicity of fixed array placement.
Solution Approach 2:
The electrode arrays are divided into multiple independently controllable segments or groups. By activating different combinations of these segments in various sequences, the system creates multiple effective treatment angles and field patterns from the same physical arrays. This segmentation allows versatile therapy delivery while keeping the overall device structure relatively simple.
3Device complexity
If reactive heat management is used with shutdowns at 105.5 F, then temperature control is simplified, but therapy delivery time is reduced to 39% of wear time
Solution Approach 1:
The system takes preliminary action by proactively managing heat through configuration rotation before critical temperature thresholds are reached. Instead of waiting for shutdown conditions and then cooling, the system preemptively redistributes thermal load by switching electrode configurations, maintaining continuous therapeutic delivery without abrupt shutdowns and extending productive therapy time.
Solution Approach 2:
The system ensures continuous therapy delivery by rotating electrode configurations to maintain effective TTF treatment without interruption. The adaptive reconfiguration allows the useful action of tumor treatment to continue uninterrupted, preventing the 61% downtime caused by reactive shutdowns while still managing heat generation through intelligent electrode management.
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 tumor reduction by maximizing dielectrophoresis and minimizing heat-related shutdowns, thereby improving treatment efficacy and consistency.
Implementation Method 1
TTFs act to disrupt a cancer cell's mitotic process and cytokinesis by manipulating the cell's polarizable intracellular constituents, namely tubulins that form mitotic spindles
Implementation Method 2
Tubulins form mitotic spindles by taking on electrical properties called dipole moments, which is tubulin molecules become positively charged on one side and negatively charged on the other side
Implementation Method 3
When a TTField runs parallel through the cleavage furrow Polarizable objects are pulled toward the highest concentration of electric field (now the cleavage furrow), in this case, the genetic material needed for cell division
Data Source
AI summary
A method of adapting a treating of tumors by the delivery of tumor treating electromagnetic fields to a patient including the steps of: placing an electrode array on the patient; selecting a first adaptation of an electrode activation configuration to activate selected elements of the electrode array to treat the tumors; analyzing cells of the tumors that have been treated using the first adaptation of the electrode activation configuration; and using the first adaptation of the electrode activation configuration to treat the tumors until depending on a cell analysis of the analyzing step then changing to a second adaptation of the electrode activation configuration to activate selected elements of the electrode array to treat the tumors, the first adaptation including a rotating of electromagnetic field frequencies between 200 kHz and 150 kHz.