Design Of Portable Detection Device For Medical Extracorporeal Lithotripter

Due to the changes in human dietary structure,the incidence of lithiasis has gradually increased,and medical extracorporeal lithotripsy has become one of the main treatments for the treatment of calculus because of its advantages of noninvasiveness and good therapeutic effect.However,with the long-term use of medical extracorporeal lithotripsy equipment,the loss of the equipment components will cause the sound field characteristics of medical extracorporeal lithotripters to shift and attenuate.The study found that the sound field characteristics of medical shock waves are closely related to the side effects of shock wave lithotripsy.However,there isn't a mandatory regular inspection in China at present,resulting in a state that the most medical extracorporeal lithotripters on the market are out of supervision.In view of the application of the medical extracorporeal lithotripters,the purpose of this thesis is to solve the problems of detecting medical extracorporeal lithotripters and develop a portable detection device.It can detect sound field focus position,sound pressure intensity,pulse rise time,pulse width and focal area by the space scanning.The main research includes hardware design and software design of the portable detection device.The mechanical structure of the detection device hardware system adopts the portable three-dimensional movement mechanism design,the detection device software system communicates with the motion control electric box through the network,to control the stepper motor's movement state.The mechanism drives the hydrophone to scan the sound field space of the medical extracorporeal lithotripter.The data acquisition card rectifies,filters,and A/D converts the signal detected by the hydrophone,and converts the analog signal into a digital signal for the detection device.The software system analyzes and processes the sound field data so as to judge whether the sound field characteristics of the medical extracorporeal lithotripter satisfy the relevant standards.In the end,the simulation and comparison of the in-focus plane sound field based on the Huygens principle is performed to verify the feasibility of the research method in theory.After a number of experiments and data analysis,the average of sound pressure intensity is 37.46 MPa at the focal point;the average deviation of the focus position is 2.40 mm;the focus sound pressure intensity is relative to the factory;the average deviation of the parameter(40MPa)is 3.6%;the pulse rise time of the focus position is less than 500ns;the focus pulse width is less than 1000ns;the nominal focal domain boundary sound pressure intensity is 18.72 MPa,less than half of the focus sound pressure intensity,and thus the conclusion that the device to be detected meets the requirements of the standard.In addition,according to the Huygens principle simulation comparison,the fitting results of the experimental data of the focal plane sound field are basically consistent with the theoretical values,which verifies the feasibility of the research method in theory and realizes effective detection for the medical extracorporeal lithotripter.