TTFields Electrode Cooling Intervals for Higher Peak Intensity
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Solution Overview
Problem
Existing tumor treating field (TTFields) systems face limitations in increasing electric field intensity due to electrode array overheating, which prevents higher current application and thus limits treatment efficacy.
Innovation Solution
Implementing alternating electric field pulses with high amplitudes that would exceed temperature thresholds if continuous, followed by cooling intervals to prevent overheating, allowing for higher peak currents and improved treatment efficacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If continuous high-amplitude alternating current pulses are applied to increase TTField intensity, then treatment efficacy is improved, but electrode array temperature exceeds safe thresholds causing overheating
Solution Approach 1:
The patent applies periodic pulsed alternating current instead of continuous current, with treatment intervals (e.g., 10 minutes on, 10 minutes off) to allow cooling periods. This periodic action maintains high peak power during treatment while preventing sustained overheating by introducing regular cooling intervals, thus resolving the contradiction between delivering high power and controlling temperature.
Solution Approach 2:
The patent implements preliminary cooling actions by applying low-amplitude or zero current during intervals before the electrode array temperature reaches dangerous levels. This preventive approach allows the system to maintain high power output during treatment phases while proactively managing heat accumulation through scheduled cooling periods, preventing thermal damage before it occurs.
2Productivity
If higher amplitude pulses are applied to achieve greater treatment efficacy, then tumor treatment effectiveness is improved, but the duration of safe continuous application is limited by thermal constraints
Solution Approach 1:
The patent employs periodic high-amplitude pulses interspersed with low-amplitude or zero-current intervals, enabling the delivery of high treatment intensity during active phases while using cooling intervals to extend the overall safe application duration. This approach allows cumulative treatment exposure to exceed what would be possible with continuous application at lower amplitudes.
Solution Approach 2:
The patent dynamically adjusts the amplitude and timing of current pulses based on real-time temperature monitoring and thermal modeling. The system adapts pulse duration, amplitude, and interval timing to maintain optimal treatment efficacy while respecting thermal constraints, allowing extended treatment sessions that would otherwise be unsafe with static continuous application.
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
Achieves higher TTField intensity with reduced overheating, enhancing treatment efficacy by applying higher peak currents for shorter durations with interleaved cooling periods.
Implementation Method 1
applying, during each of a plurality of first time intervals, a series of pulses of alternating current between at least one first electrode element and at least one second electrode element... inducing an electric field through the tumor
Implementation Method 2
allowing the at least one first electrode element and the at least one second electrode element to cool during each of a plurality of second time intervals
Data Source
AI summary
Alternating electric fields (e.g., TTFields) may be induced in a target region in a subject's body by applying, during each of a plurality of first time intervals, a series of pulses of alternating current between electrode elements positioned on or in the subject's body. Immediately following each first interval of time, the electrode elements are allowed to cool. Although the pulses of alternating current within any given first time interval have amplitudes at a level that would cause overheating if the series of pulses was allowed to continue for one hour, each series of pulses does not, in fact, continue for one hour. To the contrary, each series of pulses is short enough to avoid overheating. Interleaving the cooling periods between the pulsing periods enables higher-current pulses to be used, and the use of those higher-current pulses can advantageously improve the efficacy of treatment.