Ceramic TTF Electrode Material With High Dielectric and Low Loss
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Solution Overview
Problem
Existing methods for synthesizing ceramic materials for tumor treating fields (TTF) electrodes face challenges such as complex two-step processes, high energy consumption, and the need for materials with high dielectric constant and low loss to ensure safety and effectiveness in applying electric fields for tumor treatment.
Innovation Solution
A one-step solid phase method is used to synthesize a ceramic material composed of [0.67Bi0.995Ce0.005FeO3-0.33BaTiO3]-[Sr1-xPbxTi1-yZryO3]-[Pb(Mg1/3Nb2/3)O3] with specific doping ratios, followed by fine grinding, binder addition, compression molding, and sintering to achieve a ceramic electrode with high dielectric constant and low loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrode materials (metal, conductive polymer, doped silica glass) are used, then electrical conductivity is achieved, but biocompatibility is poor causing tissue damage and inflammation
Solution Approach 1:
The patent uses a composite material consisting of bioglass ceramic particles (45-55 wt%), collagen (20-30 wt%), and gelatin (20-30 wt%). This composite structure combines the electrical conductivity of bioglass with the biocompatibility of collagen and gelatin, eliminating tissue damage and inflammation while maintaining functional performance.
Solution Approach 2:
The patent modifies the chemical composition parameters of the ceramic material by incorporating specific ratios of SiO2 (30-40 wt%), CaO (10-20 wt%), P2O5 (5-15 wt%), and other oxides. These parameter changes transform the material properties to achieve both electrical conductivity and enhanced biocompatibility, preventing harmful effects on living tissue.
2Ease of manufacture
If traditional electrode materials are used, then electrical conductivity is provided, but the material is brittle and difficult to process into complex shapes
Solution Approach 1:
The patent creates a composite where brittle bioglass ceramic particles are embedded in a flexible collagen-gelatin matrix. This structure provides both mechanical flexibility for processing into complex shapes and structural integrity, eliminating the brittleness problem of traditional ceramic electrodes while maintaining manufacturability.
Solution Approach 2:
The patent applies different material properties to different parts of the electrode: the bioglass particles provide local electrical conductivity hotspots, while the collagen-gelatin matrix provides local flexibility and processability. This local quality differentiation allows the material to be processed into complex shapes while maintaining necessary strength and conductivity.
3Reliability
If simple ceramic compositions are used, then manufacturing is simplified, but electrical conductivity and therapeutic effectiveness are insufficient
Solution Approach 1:
The patent optimizes specific compositional parameters of the bioglass ceramic, including SiO2 (30-40 wt%), CaO (10-20 wt%), P2O5 (5-15 wt%), and trace elements (0.1-5 wt% each of Al2O3, Fe2O3, ZnO, CuO, MnO, MgO). These parameter changes enhance electrical conductivity and therapeutic effectiveness while maintaining a manageable manufacturing process through established sol-gel and sintering techniques.
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 method enables the production of ceramic electrodes with a relative dielectric constant greater than 20,000 and dielectric loss less than 0.0217, suitable for safe and effective application of electric fields in tumor treating fields, avoiding conductive current and ensuring localized treatment.
Implementation Method 1
a ceramic material for an electric field treatment of tumors... the ceramic material comprises: 30 wt% to 40 wt% SiO2, 10 wt% to 20 wt% CaO, 5 wt% to 15 wt% P2O5
Data Source
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AI summary
The invention relates to a method for preparing ceramic material of ceramic electrode for tumor treating fields, which comprises the following steps of synthesizing a[0.67Bi0.995Ce0.005FeO3-0.33BaTiO3]-b[Sr1-xPbxTi1-yZryO3]-c[Pb(Mg1/3Nb2/3)O3] powder by a solid phase method; Where 0<a<0.06, 0.05<b<0.18, a+b+c = 1; 0.6≤x≤0.8, 0<y<0.2; Fine grinding the powder, adding a binder, granulating, and pressing for forming to obtain a biscuit; Removing organic substances in the biscuit; Sinter that biscuit to obtain the ceramic material. The invention also provides a ceramic material prepared by the preparation method, which has the characteristics of high dielectric constant and low loss and is suitable for manufacturing a ceramic capacitor electrode for conducting an electric field but blocking conducting current.