一种新的超声刀能量发生器的设计与验证  

Design and Verification of a Novel Ultrasonic Scalpel Energy Generator

作　　者：林晓佳 周宇[1] 孙福佳[1] 代琦 周佳俊 黄永国 赵浩男 LIN Xiaojia;ZHOU Yu;SUN Fujia;DAI Qi;ZHOU Jiajun;HUANG Yongguo;ZHAO Haonan(School of Health Science and Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学健康科学与工程学院,上海200093

出　　处：《生物医学工程学进展》2023年第2期139-148,共10页Progress in Biomedical Engineering

摘　　要：目的目前国内超声刀的品牌越来越多,但关于超声刀能量发生器的研制和参数优化的相关文献非常少。该文旨在研发一种新的超声刀能量发生器,用于进行不同控制模式、不同参数调节的研究工作。方法自主设计超声刀能量发生器硬件,使用FPGA+DAC构成直接数字合成器(DDS)实现频率调整,采用开关型E类功率放大器来降低系统发热;在算法设计上,采用小步长频率跟踪策略,使系统工作于谐振状态,同时采用PID算法实现恒电流和恒功率输出;最后开展性能测试实验。结果DDS调整频率的最小步长为0.0116Hz,频率跟踪在切割过程中始终保持锁相稳定;恒电流输出使超声刀在空载和带载状态下均具备良好的切割性能,工作过程中电流波动小于1mA,切割速度随着电流的增大明显加快。在带载状态下,300mA恒电流模式切断小肠时间为(8.01±0.35)s,热损伤宽度为(3.57±0.23)mm。结论该方案下的超声刀能量发生器可以实现高精度的频率跟踪和稳定的恒流输出,该套设备为超声刀能量发生器的设计提供了可行的方案。Objective At present,there are more and more domestic brands of ultrasonic scalpel,but there is very little literature on the development of ultrasonic scalpel energy generator and parameter optimization.This research aims to develop a novel ultrasonic scalpel energy generator,which is used for research on different control modes and different parameter adjustments.Methods The hardware of the ultrasonic scalpel energy generator is designed independently,and the Direct Digital Synthesizer(DDS)is composed of FPGA+DAC to achieve frequency adjustment.Class E switch power amplifier is used to reduce system heating;In the algorithm design,the small step frequency tracking strategy is adopted to make the system work in the resonant state,and the PID algorithm realizes constant current and constant power output;Finally,the performance test experiment was carried out.Results The minimum step size of DDS frequency adjustment is 0.0116Hz,and the frequency tracking keeps stable during the cutting process;The constant current output makes the ultrasonic scalpel have good cutting performance under no-load and loaded conditions.The current fluctuation is less than 1mA during the working process,and the cutting speed is significantly accelerated with the increase of the current.Under the load state,the time of cutting small intestine in 300mA constant current mode is(8.01±0.35)s,and the thermal damage width is(3.57±0.23)mm.Conclusion The ultrasonic scalpel energy generator designed in this scheme can achieve high-precision frequency tracking and stable constant current output.This set of equipment provides a feasible scheme for the design of ultrasonic scalpel energy generator.

关 键 词：超声刀能量发生器 恒电流输出 热损伤宽度 小步长调频 

分 类 号：R318[医药卫生—生物医学工程]