Implantable Electric Field Therapy System Thermal Management
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Solution Overview
Problem
Current cancer treatment therapies often result in significant side effects on healthy tissue due to the generation of heat during the application of electrical fields intended to prevent and disrupt cellular mitosis.
Innovation Solution
An implantable system that switches between different modes of generating electrical current for electric field therapy electrodes to maintain an effective electric field strength above a minimum threshold, thereby minimizing heat generation and maximizing treatment efficacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrical fields are applied to prevent and disrupt cellular mitosis, then cancer treatment efficacy is improved, but heat generation increases causing side effects on healthy tissue
Solution Approach 1:
The system employs periodic duty cycling of the electrical current, switching between active therapy delivery and rest periods. This allows the electric field to be applied intermittently rather than continuously, maintaining cancer cell disruption efficacy while allowing heat to dissipate between cycles, thereby reducing thermal damage to healthy tissue.
Solution Approach 2:
The system dynamically adjusts electrical current parameters including amplitude modulation and duty cycle percentage based on real-time monitoring of therapy response and thermal conditions. This dynamic adaptation enables optimization of the balance between maintaining effective electric field strength for cancer treatment and limiting heat generation to prevent side effects.
2Reliability
If electrical current amplitude is increased to maintain effective electric field strength, then therapy efficacy is improved, but heat generation increases
Solution Approach 1:
Instead of continuously increasing amplitude, the system uses periodic duty cycling where high amplitude pulses are delivered during active therapy phases followed by rest phases. This maintains effective electric field strength during treatment windows while allowing thermal dissipation during off-periods, achieving the desired amplitude-effect without proportional heat accumulation.
Solution Approach 2:
The system changes multiple parameters simultaneously including amplitude, duty cycle percentage, and frequency to maintain effective electric field strength while controlling thermal output. By adjusting these parameters in combination rather than increasing amplitude alone, the system achieves therapy efficacy with reduced heat generation.
3Object-affected harmful factors
If duty cycling is used to reduce heat generation, then side effects on healthy tissue are reduced, but the amount of time electric field strength is above threshold decreases
Solution Approach 1:
The system dynamically optimizes duty cycle percentage and pulse duration based on real-time monitoring of tumor response, thermal conditions, and electric field distribution. This dynamic adjustment ensures maximum possible therapy delivery time above the effective threshold while maintaining duty cycle levels that prevent excessive heat accumulation and side effects.
Solution Approach 2:
The system adjusts multiple parameters including duty cycle percentage, pulse width, and frequency to optimize the time above threshold. By coordinating these parameter changes, the system maximizes therapeutic exposure time while keeping thermal load within safe limits, achieving an optimal balance between treatment duration and safety.
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 system effectively maintains an electric field strength sufficient to prevent and disrupt cellular mitosis while minimizing heat generation, thus reducing side effects on healthy tissue.
Implementation Method 1
a therapy output circuit configured to generate an electrical current for a plurality of electric field therapy electrodes to create one or more electric fields
Implementation Method 2
Current cancer treatment therapies often result in significant side effects on healthy tissue due to the generation of heat during the application of electrical fields
Data Source
AI summary
Embodiments herein relate to implantable systems for cancer treatment and related methods. In an embodiment, an implantable system for cancer treatment is included having a therapy output circuit configured to generate an electrical current for a plurality of electric field therapy electrodes to create one or more electric fields and control circuitry that causes the therapy output circuit to generate the one or more electric fields at frequencies selected from a range of between 10 kHz to 1 MHz within a bodily tissue. The control circuitry can be configured to select between operating in a first mode or a second mode of generating the electrical current for the electric field therapy electrodes based on a minimum electrical field strength threshold, wherein the first mode includes modulating amplitude of the electrical current and the second mode includes duty cycling of the electrical current. Other embodiments are also included herein.