Ultrasonic scalpel system based on frequency and power tracking and control method thereof

Abstract

The invention discloses an ultrasonic scalpel system based on frequency and power tracking and a control method thereof. The ultrasonic scalpel system comprises a main control MCU, a DDS-based signalgeneration control module, a power output isolation module, an interaction module and a medical switching power supply, wherein the signal generation control module uses a DDS chip to generate two paths of high-precision PWM signals with specific frequencies, and the power is controlled by a digital control half-bridge power adjusting circuit based on a clock circuit; and the power isolation module is used for matching the inductive reactance through the series power inductance, providing an interface for an ultrasonic scalpel, and respectively using a PID algorithm and an ADRC algorithm to control the power output and the working frequency of the ultrasonic scalpel in real time so as to achieve the real-time control of the power and the follow-up control of the resonance point frequency.The system has the advantages of high control precision, high response speed, good operation effect, high energy utilization rate, convenient operation and the like, and is suitable for driving ultrasonic surgical scalpel equipment in common ultrasonic surgical operations.

Description

technical field [0001] The invention relates to an ultrasonic scalpel system, in particular to an ultrasonic scalpel system based on frequency and power tracking and a control method thereof, which are used to drive the scalpel head to work stably at a resonance point. Background technique [0002] Ultrasound technology is a highly comprehensive subject, involving many fields such as electronics, acoustics, materials, machinery, and medical treatment. Ultrasonic scalpel, as one of the commonly used medical devices in surgery, its working principle is to convert electrical energy into mechanical energy by driving an ultrasonic transducer, and then drive the scalpel to perform high-frequency vibration at the resonant frequency point, so that the tissue inside Vaporization of water, protein hydrogen bond breakage, denaturation, cell disintegration, tissue is cut or coagulated, blood coagulation stops bleeding at the same time of tissue separation and tissue cutting. Because of...

AI Technical Summary

Problems solved by technology

[0004] Since the access impedance characteristics of the ultrasonic transducer will change with the change of the mechanical load applied to the transducer, when the ultrasonic scalpel is loaded with different blades, acting on different objects or different parts, its resonant frequency will also change If the frequency of the electrical signal output by the power generating device is not adjusted in time to make the transducer work in a resonant state, the cutter head will be damaged over time, affecting the quality and effect of the operation

[0005] At present, the power generation devices of many ultrasonic scalpel equipment adopt open-loop control in the output of frequency and power, so it is impossible to effectively track and control the operating frequency of the scalpel and the output power of the equipment, and some ultrasonic scalpel equipment can realize frequency tracking. control, but the PID control algorithm is generally used, which is difficult to take into account the overshoot and adjustment speed of the system adjustment at the same time, and cannot respond to and compensate for the input of the disturbance amount in time.

When the ultrasonic scalpel is loaded with different cutting heads, or the circuit structure of the ultrasonic power generating device is different, the optimal adjustment parameters of the system will also change accordingly. Using the PID control algorithm cannot effectively solve the problem of insufficient frequency tracking control adjustment speed and overshoot. Many problems of large quantity and low adjustment accuracy

The above problems have adverse effects on the frequency tracking performance of the ultrasonic scalpel power drive system, greatly reducing the service life of the ultrasonic scalpel and reducing the medical effect of the operation

Images