Implantable TTFields Arrays With Temperature Feedback for Tissue Heating
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Solution Overview
Problem
Existing TTFields therapy systems using transducer arrays on the skin are cumbersome, cause skin irritation, limit patient mobility, and pose infection risks, while requiring high power consumption and being ineffective for treating certain anatomical structures like the spinal cord.
Innovation Solution
Implantable transducer arrays within the body, accompanied by internal temperature sensors and an AC voltage generator, reduce bulk and infection risk, improve comfort, and optimize power usage by minimizing tissue heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transducer arrays are placed on the skin, then TTFields therapy can be delivered, but patient comfort deteriorates and skin irritation occurs
Solution Approach 1:
The patent extracts the transducer arrays from the skin surface and implants them within the body (subcutaneously or intradurally). This removes the source of skin irritation while maintaining the ability to deliver TTFields therapy to the tumor. The arrays are positioned inside the body cavity rather than on the external skin surface.
Solution Approach 2:
The system is divided into separate implantable components: transducer arrays, temperature sensors, and electronic control devices. These segmented components can be positioned optimally within the body without compromising skin integrity, allowing therapy delivery while avoiding skin-related harmful effects.
2Reliability
If transducer arrays are placed on the skin, then TTFields therapy can be delivered, but infection risk increases
Solution Approach 1:
By extracting the transducer arrays from the skin surface and implanting them within the body, the patent eliminates the need for external cables and connectors that penetrate the skin. This closed implantable system removes the primary infection pathway while maintaining continuous therapy delivery capability.
3Reliability
If transducer arrays are placed on the skin, then TTFields therapy can be delivered, but patient mobility is limited
Solution Approach 1:
The patent extracts the transducer arrays from the skin surface and implants them permanently within the body. This eliminates the need for external adhesive arrays that restrict movement and require frequent repositioning, allowing patients to move freely while maintaining continuous therapy delivery.
4Reliability
If high power is used to deliver TTFields, then therapy effectiveness is improved, but tissue heating increases
Solution Approach 1:
The patent incorporates temperature sensors that continuously monitor tissue temperature and provide feedback to the control system. When temperature approaches unsafe levels, the system automatically adjusts the power delivery to maintain therapy effectiveness while preventing excessive heating. This closed-loop control resolves the contradiction between effective therapy and tissue heating.
Solution Approach 2:
The system uses periodic alternating current fields rather than continuous high-power delivery. The alternating nature of the fields allows for thermal management while maintaining therapeutic effectiveness through cumulative cellular disruption over time.
5Reliability
If external transducer arrays are used, then TTFields can be applied, but the system becomes cumbersome
Solution Approach 1:
The patent extracts the transducer arrays from external placement and implants them within the body. This eliminates the need for external cable boxes, power supplies, and connection cables, dramatically reducing system bulk and simplifying the overall device architecture while maintaining reliable therapy delivery.
Solution Approach 2:
The patent merges multiple external components (transducer arrays, temperature sensors, power supply, and control electronics) into integrated implantable units. This consolidation eliminates external cables and connectors, reducing system complexity and bulk while maintaining all necessary functions for therapy delivery and monitoring.
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 patient comfort, reduces infection risk, and allows effective delivery of TTFields to previously inaccessible areas like the spinal cord, with optimized power efficiency and reduced skin irritation.
Implementation Method 1
The amplitude of the alternating current that is delivered via the transducer arrays
Implementation Method 2
The temperature measurements on the patient's skin are obtained using thermistors
Implementation Method 3
an inductively coupled circuit configured for implantation within the person's body and configured to power the AC voltage generator
Data Source
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AI summary
Tumor treating fields (TTFields) can be delivered by implanting a plurality of sets of implantable electrode elements within a person's body, with temperature sensors positioned to measure the temperature at the electrode elements also being implanted.