TTFields Electrode Array Layout to Minimize Edge Heating
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Solution Overview
Problem
Conventional transducer designs for tumor treating fields (TTFields) are limited by the 'edge effect', which leads to uneven current distribution and hot spots, restricting the maximum TTField strength due to temperature thresholds.
Innovation Solution
Transducer arrays with specific electrode element layouts that minimize the edge effect, such as arrays with a high percentage of peripheral electrode elements and symmetrical, convex outer perimeters, allowing for increased current application without exceeding temperature thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If intraoperative RF ablation is used to treat tumor vessels, then tumor treatment effectiveness is improved, but the procedure is highly operator-dependent and reproducibility is poor
Solution Approach 1:
The system enables autonomous navigation and positioning of the RF ablation catheter through image-guided technology. The navigation system automatically tracks the catheter position relative to tumor vessels using preoperative imaging, eliminating the need for real-time operator intervention and achieving consistent, reproducible treatment results.
Solution Approach 2:
The patent replaces manual mechanical navigation with an image-guided automated positioning system. The system uses computational algorithms to process preoperative images and automatically calculate optimal catheter positions, substituting operator skill and manual manipulation with automated computational guidance.
2Ease of operation
If percutaneous approaches are used for RF ablation, then accessibility is improved, but tumor vessels may be injured by needle puncture and access is difficult in certain locations
Solution Approach 1:
The patent introduces an image-guided navigation system as an intermediary between the operator and the tumor vessels. This intermediary system processes preoperative imaging data to calculate safe access paths and optimal catheter positions, mediating the interaction to avoid direct needle puncture of tumor vessels while maintaining accessibility.
Solution Approach 2:
The system performs preliminary analysis of preoperative images to pre-calculate optimal access paths and catheter positions before the actual procedure. This preliminary action identifies safe zones and optimal angles to avoid tumor vessel injury during needle insertion, enabling percutaneous access without compromising vessel integrity.
3Ease of operation
If open surgical approaches are used for RF ablation, then accessibility to deep or centrally located tumors is improved, but morbidity and recovery time increase
Solution Approach 1:
The patent replaces open surgical mechanical access with image-guided percutaneous access. The navigation system uses computational algorithms to plan and guide minimally invasive needle insertion, substituting the need for large incisions and open surgery with precise percutaneous puncture through soft tissue, thereby reducing morbidity and recovery time while maintaining accessibility to deep tumors.
4Measurement precision
If real-time imaging guidance is used during RF ablation, then positioning precision is improved, but equipment complexity and cost increase
Solution Approach 1:
The system performs all image processing, vessel segmentation, and path calculation in advance using preoperative imaging data. This preliminary action eliminates the need for complex real-time imaging equipment during the procedure, achieving high positioning precision through pre-planned trajectories while reducing operational equipment complexity.
Solution Approach 2:
The patent uses preoperative imaging data (such as CT or MRI scans) as a digital copy of the patient's anatomy to plan and guide the procedure. Instead of requiring complex real-time imaging systems, the system works with static preoperative images that have been processed to create navigation models, achieving precision without the complexity of real-time imaging equipment.
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
Enables the delivery of higher TTField strengths safely, enhancing treatment efficacy by reducing hot spots and improving current distribution across the transducer array.
Implementation Method 1
The RF generator may be used to deliver RF energy to the catheter, and the catheter may be used to deliver the RF energy to a subject's tumor vessels for treatment of the tumor
Data Source
Figure 1~3D
Figure 4A~4B
Figure 5
AI summary
A transducer apparatus for delivering tumor treating fields to a subject's body, the transducer apparatus including: an array of electrode elements comprising all electrode elements present on the transducer apparatus, the array configured to be positioned over the subject's body with a face thereof facing the subject's body; when viewed from a direction perpendicular to the face, a number of electrode elements of the array are peripheral electrode elements defining an outer perimeter, the peripheral electrode elements substantially surrounding all other electrode elements; for each pair of adjacent peripheral electrode elements, a distance between the pair is not more than 25% greater than a distance between any other pair of adjacent peripheral electrode elements; and for each peripheral electrode element, an angle formed between the peripheral electrode element and its two adjacent peripheral electrode elements is greater than 90 and less than 180 degrees and facing interior to the array.