恒功率高频电刀能量发生器：生物组织的切割与闭合

Constant power electrosurgical generator: Biological tissue cutting and sealing

背景:随着医疗器械的不断发展,越来越多的传统外科治疗被微创治疗所取代。在微创外科手术中,要经常进行组织切割和闭合,然而,由于空间与视野的限制,普通的方法并不适用微创治疗。目的:研制能够恒功率输出具有组织切割和闭合功能的高频电刀能量发生器。方法:为了提高外科治疗中对组织切割与闭合的效率,研制了一套用电能对组织进行切割与闭合的高频能量发生器。该装置包括:幅值可调开关电源、高频功率放大器、阻抗检测模块和微控制器。其中由开关电源和功率放大器组成的电能变换器将220 V 50 Hz的市电变换为一个450 kHz的高频能量并作用在组织上,同时阻抗检测模块将实时检测生物组织上的电参数,并将其作为反馈量提供给控制器,最后由控制器完成恒功率控制和生物阻抗判定。结果与结论:实验结果表明,研制的仪器能够快速稳定地产生高频大功率电能,能实时检测生物阻抗信息,并通过反馈控制实现恒功率输出,可有效完成对生物组织的切割与闭合。

BACKGROUND： With the development of medical instruments, more and more traditional surgical operations are replaced by minimally invasive surgeries. In minimally invasive surgery, cutting and sealing tissue is a conventional procedure; however, due to the limitation of space and vision, the ordinary methods are not suitable for minimally invasive surgery. OBJECTIVE： To develop high frequency electresurgical generator that has a constant power output and ability for tissue cutting and closing. METHODS： In order to improve the efficiency of tissue cutting and sealing in surgical, a kind of high-frequency energy generator was developed for tissue cutting and sealing. The instrument consisted of switching power supply with adjustable amplitude, high-frequency power amplifier, impedance monitor and microcontreller. The energy converter composed of switching power supply and high-frequency power amplifier converted the 220 V, 50 Hz utility powers to a kind of high-frequency energy with 450 kHz and applied on tissues. Impedance monitor would real-timely detect the electrical parameter impacting on tissue that was provide the amount of feedback tomicrocontroller in order to complete constant power control and bioimpedance determination by the controller. RESULTS AND CONCLUSION： The experimental results indicated that the instrument could rapidly and stably provide high-frequency energy, and could detect the biological impedance in real-time, achieve constant power output through feedback control, and could cut and close the biological tissue efficiently.