TTField Orientation Control via Multi-Array Amplitude Superposition
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Solution Overview
Problem
Existing Tumor Treating Fields (TTFields) therapy systems, such as the Optune® system, are limited in their ability to induce electric fields with overall directionality other than two specific orientations, restricting flexibility in treating tumors located in certain anatomic locations within the body.
Innovation Solution
Simultaneously applying in-phase AC signals to multiple pairs of transducer arrays, with adjustable amplitudes, to create an alternating electric field that can vary in orientation over time, allowing for induction of electric fields in more than two directions by superposition of components from different electrode pairs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If only one output of the AC signal generator is active at a time, then the system is simpler to control, but the electric field orientation is limited to two specific directions
Solution Approach 1:
The patent combines multiple AC signal outputs (Q1, Q2, Q3, Q4) to be active simultaneously, merging their electric field contributions through superposition. This allows the system to generate electric fields in multiple orientations beyond the traditional two directions, directly resolving the contradiction by prioritizing adaptability while accepting increased control complexity.
Solution Approach 2:
The patent introduces dynamic amplitude adjustment capabilities where the amplitudes of individual AC signals can be varied independently over time. This dynamic control enables continuous variation of the resultant electric field orientation, transforming a static two-directional system into a dynamically adjustable multi-directional system.
2Adaptability or versatility
If multiple AC signals are applied simultaneously with adjustable amplitudes, then electric field orientation flexibility is improved, but the device complexity increases
Solution Approach 1:
The patent makes the AC signal generator universally capable of driving multiple transducer array pairs simultaneously with independent amplitude control. This multi-functional capability allows a single system to address various tumor locations and orientations without requiring multiple specialized systems, resolving the contradiction by achieving versatility through a unified controllable platform.
3Adaptability or versatility
If the AC signal generator activates only one output at a time, then the control mechanism is simpler, but the treatment options for tumors in certain anatomic locations are restricted
Solution Approach 1:
The patent transitions from a one-dimensional alternating activation scheme (one output at a time) to a multi-dimensional simultaneous activation scheme where multiple outputs operate together with independently controllable amplitudes. This dimensional expansion in the control space enables treatment of tumors in previously inaccessible anatomic locations while maintaining operational manageability through systematic control procedures.
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
This approach provides increased flexibility in positioning transducer arrays and enables the generation of electric fields with desired directionality, improving treatment options for tumors by allowing electric fields to be steered to any desired direction, including orthogonal orientations, which was not possible with prior art systems.
Implementation Method 1
The AC signal generator (a) sends an AC current through the left/right (L/R) pair of transducer arrays for 1 second, which induces an electric field with a first direction through the tumor
Implementation Method 2
inducing an alternating electric field with an overall direction that is a superposition of the first direction and the second direction
Data Source
AI summary
Tumor Treating Fields (TTFields) therapy is a proven approach for treating tumors using alternating electric fields. When treating tumors in certain anatomic locations (e.g., at certain locations within a subject's head) it may be beneficial to induce an electric field through the subject's body with an overall directionality that varies between more than two directions. The embodiments described herein can induce electric fields in many different directions by simultaneously applying AC signals to different pairs of transducer arrays and adjusting the amplitudes of those AC signals.