频率可选的射频消融治疗系统

Frequency-Selectable RF Ablation Treatment System

为了扩大射频消融的应用领域,为实现靶向组织精准适形治疗与彻底消融提供一种新的技术支持,该文基于E类功率放大器设计的基本原理,采用MSP430单片机作为控制器,使用触控显示屏作为人机交互界面,设计了多种不同频率的射频消融治疗系统。对230kHz,460 kHz,920 kHz,2 000 kHz频率下的射频信号测试验证了系统的可行性,在仿生物胶体中测试了460 kHz、920 kHz、2 000 kHz频率射频的加热规律,测试结果表明:所设计的系统在不同频率下均可产生足够的加热效果,并且在恒定功率控制模式下,加热温升和消融面积随着射频频率的增加而减小。

In order to support study of new radiofrequency ablation treatments and finally realize of precise confornal ablation of targeted tissue, this paper proposed a system which is able to generate radio frequency currents at different frequencies. The designed system bases on the basic principle of Class E power amplifier and uses MSP430 microcontroller as a controller and uses a touch screen as human machine interface to design a frequency selectable radiofrequency ablation treatment system. The RF signals at frequencies of 230 kHz, 460 kHz, 920 kHz, and 2 000 kHz were tested to verify the feasibility of the system. and by using a tissue phantom, tested the heating ability of the RF signals at frequencies of 460 kHz, 920 kHz, and 2 000 kHz. The results show the device could well heat the tissue at the three frequencies. The study has also found that both the highest temperature and the ablation area decreases with RF frequency, when using the constant power control mode.