Skull-Implant TTFields Electrodes for Precise Brain Tumor Targeting
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Solution Overview
Problem
The existing TTFields treatment for glioblastoma faces challenges in accurately targeting the tumor due to the attenuation of electric fields by the skull and scalp, requiring high voltage and current to achieve therapeutic efficacy, and is hindered by anatomical obstacles like surgical wounds or skin abnormalities.
Innovation Solution
Incorporating transducer arrays into skull implants that replace sections of the skull, utilizing conductive plates and dielectric layers to capacitively couple the electric field directly into the tumor, reducing the need for high voltage and current, and enabling precise treatment planning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If electrodes are placed on the patient's scalp for TTFields treatment, then the treatment can be delivered non-invasively, but the electric field is attenuated by the skull and scalp requiring high voltage and current to achieve therapeutic efficacy
Solution Approach 1:
The patent introduces skull implants as intermediary structures that replace the natural skull and serve as conductive pathways. These implants act as mediators between the external electrodes and the tumor, providing a direct route for electric field delivery while reducing attenuation. The implants are positioned to bridge the gap between the scalp electrodes and the intracranial tumor target.
Solution Approach 2:
The patent transitions from a surface-level electrode placement (2D scalp surface) to an integrated three-dimensional configuration where electrodes are embedded within skull implants that extend into the intracranial space. This dimensional extension allows the electric field to be delivered directly at the tumor interface, bypassing the attenuating effect of the natural skull and scalp layers.
2Ease of operation
If electrodes are placed on the patient's scalp for TTFields treatment, then the treatment can be delivered non-invasively, but anatomical obstacles like surgical wounds or skin abnormalities hinder accurate tumor targeting
Solution Approach 1:
The skull implants serve as intermediary structures that can be positioned and secured directly to the skull bone, providing a stable and precise reference framework. This intermediary approach allows for accurate tumor targeting independent of skin conditions, as the implant anchors to the underlying bone structure rather than relying on skin surface landmarks that may be compromised by surgical wounds or abnormalities.
Solution Approach 2:
The skull implants are positioned and secured to the skull bone before the actual TTFields treatment begins. This preliminary positioning establishes a precise anatomical reference framework in advance, ensuring that subsequent electrode placement and electric field delivery are accurately directed at the tumor target regardless of skin conditions or surgical histories.
3Reliability
If high voltage and current are used to compensate for skull and scalp attenuation, then therapeutic efficacy can be achieved, but the complexity and safety concerns increase
Solution Approach 1:
The skull implants act as intermediary conductive structures that improve electric field transmission efficiency. By providing a direct bone-to-bone or bone-to-tissue pathway, the implants reduce the resistance and attenuation that would otherwise require compensatory high voltage and current, thereby lowering system complexity and safety risks while maintaining therapeutic efficacy.
Solution Approach 2:
The patent changes the physical parameters of the treatment pathway by introducing conductive skull implants with specific electrical properties (conductivity, geometry, and positioning). These parameter changes in the transmission medium improve field delivery efficiency, allowing therapeutic electric fields to be generated at lower voltages and currents compared to conventional scalp-based approaches.
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 effective tumor treatment with reduced voltage and current requirements, improves targeting accuracy, and accommodates anatomical limitations by integrating electrodes directly into the skull, enhancing treatment efficacy and planning.
Implementation Method 1
utilizing conductive plates and dielectric layers to capacitively couple the electric field directly into the tumor
Data Source
AI summary
Tumors inside a person's head (e.g., brain tumors) can be treated using tumor treating fields (TTFields) by positioning capacitively coupled electrodes on opposite sides of the tumor, and applying an AC voltage between the electrodes. Unlike the conventional approach (in which all of the electrodes are positioned on the person's scalp) at least one of the electrodes is implemented using an implanted apparatus. The implanted apparatus includes a rigid substrate shaped and dimensioned to replace a section of the person's skull. At least one electrically conductive plate is affixed to the inner side of the rigid substrate, and a dielectric layer is disposed on the inner side of the conductive plate or plates. An electrically conductive lead is used to apply an AC voltage to the conductive plate or plates.