用于单极切割的智能电外科设备的研制

Design of intelligence electrosurgical equipment for monopolar cutting

目的研制一台用于单极切割组织的智能电外科设备,以解决在恒功率模式下使用高频电刀无法同时避免出现热损伤和切割阻力的问题。方法设备的硬件电路为一个闭环可控射频能量发生器,以PID算法为基础配合硬件电路实现了恒功率模式,以智能电切算法和PID算法为基础配合硬件电路实现了智能切割模式。在恒功率模式20、40、60、80 W及智能切割模式下,对体外猪肉组织进行切割,验证智能切割模式对热损伤和切割阻力的控制能力。结果设备的两个模式均可正常工作。恒功率模式下输出功率设置为20 W时组织热损伤最小,切割时阻力最大;恒功率模式下输出功率设置为80 W时切割时阻力最小,组织热损伤最大;智能切割模式下,热损伤大小只大于恒功率模式20 W对照组,切割阻力只大于恒功率模式80 W对照组。结论智能电外科设备的智能切割模式可以通过控制输出功率平衡切割阻力、热损伤,使二者同时保持在较低水平。

Objective To develop an intelligent electrosurgical equipment for monopolar cutting tissue,and to solve the problem that thermal damage and cutting resistance cannot be avoided at the same time when using high-frequency electric knife in constant power mode.Methods The hardware circuit of the equipment is a closed-loop controllable RF energy generator.The constant power mode is realized based on an algorithm called PID and hardware circuit.The intelligent cutting mode is realized based on the intelligent electric cutting algorithm,PID and hardware circuit.The control ability of intelligent cutting mode for thermal damage and cutting resistance is proved by the comparative experiments of the two modes.In the constant power mode,the output power is set to 20 W,40 W,60 W and 80 W as four groups,and the intelligent cutting mode as one group to cut the in vitro pork tissue.Results Both modes of the equipment can work correctly.In the validation experiment,in the constant power mode,when the output power is set to 20 W,the tissue thermal damage is the smallest,and the resistance is the largest during cutting;in constant power mode,when the output power is set to 80 W,the resistance during cutting is the smallest,the tissue thermal damage is the largest;in intelligent cutting mode,the thermal damage is only greater than that in constant power mode,the output power is set as 20 W control group,and the cutting resistance is only greater than that in constant power mode,the output power is set as 80W control group.Conclusions The intelligent cutting mode of intelligent electrosurgical equipment can balance the cutting resistance and thermal damage by controlling the output power to keep them at a low level at the same time.