Research And Design Of FPGA And STM32Microcontroller System Based On Ultrasonic Lithotripsy

In modern life, as people accelerate the pace of life, improvement of livingstandards, the lack of movement causes most people’s body in a unhealthy condition,especially in recent years various domestic environmental deterioration, resulting surgein the incidence of diseases stones and the only effective method of treatment is atraditional stone surgery that open surgery. In this context, with the rapid developmentof science and technology, in vivo ultrasonic lithotripsy technology came into being, theuse of technology can improve the gravel efficiency and small wounds, recovery time isshort, little damage to the patient’s body. However, due to insufficient productionprocess, domestic ultrasonic lithotripsy systems prevalent range of issues, and importedthe equipment is expensive, requiring a good solution to these problems, so thetechnology can now better serve the people.The principle of ultrasonic lithotripsy is a signal source output via the ultrasonictransducer to match the resonance point of the sinusoidal signal having a fixedfrequency, and therefore the quality of the output signal of the signal source is relativelyhigh. At the same time,in the working process, due to the process defects the ultrasonictransducer’s resonance frequency point will change with the temperature when theenvironment changes, if the signal source output signal can’t follow the change in theresonant frequency of the transducer, the efficiency of the ultrasonic transducer isdecreased, thus affecting the effect of gravel that can’t be completelyUnder this background, firstly the working principle of the ultrasonic lithotripsysystem are compared with the advantages and disadvantages of each feasible scheme,and then put forward a design scheme of ultrasonic lithotripsy based on FPGA andSTM32. The system adopts the Cyclone series of the second generation of FPGA as thesignal source generator and controller, is used to output sine signal and adjusts theoutput frequency; at the same time, the system uses serial LCD touch screen asman-machine interaction, and STM32as control core, through the serial port tocommunicate with the LCD screen, through the I/O port data exchange with FPGA. Theoutput signal control system stability FPGA and STM32based on the system design, theoutput frequency of transducer can follow the resonant frequency changes, feedback control system with high precision.After six months of testing, the controller design has been achieved.The system isstable in operation, high energy conversion efficiency, and performance is excellent,basically meet the design requirements, and now it has been adopted by the nationalrelated department, which is now applied and clinical test.