A Method For Monitoring Fracture Healing Based On CMUT

Fracture is a multi-orthopedic disease.For various reasons,the number of fracture patients increases year by year.At present,the monitoring methods of fracture patients with fracture are mainly X-ray,computed tomography,and magnetic resonance imaging.However,on the one hand,these methods will cause radiation when monitoring the fracture healing,causing secondary damage to the human body;on the other hand,the equipment used in these methods is relatively large,expensive,and inconvenient.Today,clinical medicine,computer science,mechanical engineering and other fields are combined with each other in a new way to reveal the mechanism of fracture treatment.This article first studied the capacitive micromachined ultrasonic transducer,analyzed the geometric structure and working parameters of the capacitive micromachined ultrasonic transducer,described the geometric characteristics and working principles of the capacitive micromachined ultrasonic transducer,established an ultrasonic sensor equivalent circuit model and deduced formula expression of parameters.Then,a fracture healing monitoring model based on capacitive micromachined ultrasonic transducers was built,which derived the relevant equations during ultrasonic transmission.the condition of the fracture healing can be monitored by observing the terminal voltage that a fracture healing monitoring model receiving from the capacitive micromachined ultrasonic transducers.In order to analyze the voltage variation of a fracture healing monitoring model established by the receiving end capacitive micromachined ultrasonic transducers terminal voltage,this article uses the COMSOL software to simulate the key factors affecting the performance of the capacitive micromachined ultrasonic transducer,which analyzes the thickness of the vibration film,the shape of the vibration film,the material of the vibration film,and the height of the cavity and determines the appropriate geometric parameters.After confirming the geometric parameters,the fracture healing monitoring model established by a capacitive micromachined ultrasonic transducer was simulated.During the simulation,3mm fracture,2mm fracture,and 1mm fracture were simulated to observe the changes in the terminal voltage of the receiving capacitive micromachined ultrasonic transducer and dynamic simulation fracture healing process.Then,based on the above mentioned fracture healing monitoring model,biological factors were added to observe the terminal voltage variation of the receiving capacitive micromachined ultrasonic transducer was observed when the concentration of biological changed.Finally,this article compares the simulation results with the data of other fracture healing monitoring models,and obtained a conclusion that the capacitive micromachined ultrasonic transducer can be used to monitor fracture healing.Through the analysis of fracture depth and the concentration of biological factors,the change of terminal voltage receiving was obtained during the process of fracture healing.