A novel ISM band reflector type applicator design for microwave ablation systems

Microwave ablation (MWA) is a minimally invasive thermal ablation technique that has the advantages of obtaining high intratumoral temperatures, less treatment time and large ablation region as compared to other thermal ablation techniques. The ablation region obtained during MWA procedure mainly depends on the design and type of the trocar being used. The trocar plays an essential role in the MWA system by governing the energy distribution during tissue ablation. In this study, a novel MWA trocar design has been considered to achieve concentrated ablation region along the tumor's spatial distribution. A dual tine trocar with each tine supplied with energy at different frequencies (2.45 GHz and 6 GHz) has been considered for tumor ablation. Commercially available Finite Element based software has been used (COMSOL-Multiphysics) to analyze the extent of ablation zone. Coupled bioheat and electromagnetic physics interfaces have been utilized. Results showed that the proposed trocar with tines operating at 6 GHz on both the tines leads to a large ablation region (3 cm in diameter) with spherical in shape. Irregularly shaped ablation region can also be achieved by this trocar with tines operating at different frequencies. The minimum time required for complete tumor ablation by the trocar operated at 6 GHz is 4 minutes, followed by 6 minutes for the trocar operated at 2.45 GHz. The proposed trocar can become a part of a better treatment planning system (TPS) based on tumor shape, nearby blood vessel presence, and the trocar's precise insertion.

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Vibration-Based Measurement System for Breast Tissue

Ak,

Bilgin,

Kaya

et al. 2024

Mühendislik Bilimleri Ve Tasarım Dergisi

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When the studies in the literature on breast tumor diagnosis are examined, there are many studies because breast tissues have different characteristics. However, there is no study on the diagnosis of the tumor by constant frequency vibration stimulation and the response of healthy and tumorous breast tissues to this stimulation. This study, fixed frequency vibration was applied to the points determined on breast tissues and it was aimed to design a system that can measure vibration signals at certain distances from these points. The first part of the system consists of a motor and a driver that provides vibration. The other part includes accelerometer sensors that measure vibrations at certain points in the breast tissues. The hardware is controlled by a microcontroller-based module. With the help of this designed device, the power spectra of the vibration signals obtained by measurements on breast phantom models were analyzed. In response to 160 Hz vibration excitation, the dominant frequencies of the signals measured at a certain distance with the accelerometer sensor were found to be in the range of 120-140 Hz. These results show the damping effect of breast tissue and that the damping effect may differ between tumor and healthy tissues.

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A novel ISM band reflector type applicator design for microwave ablation systems

Cited by 3 publications

References 24 publications

Research on Audio Playing System Design Factors Modeling based on Interpretive Structure Model

Research on Audio Playing System Design Factors Modeling based on Interpretive Structure Model

Microwave Ablation Trocar Operated at Dual Tine Dual-Frequency: A Numerical Analysis

Vibration-Based Measurement System for Breast Tissue

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