Modeling Of Ortho-SUV Frame And Orthopedic Algorithm Research

Our country has a huge population,every year there are a large number of fracture and deformity patients need treatment.Because of its advantages of wide application,reliable fixation and minimally invasive,external fixators are more and more favored by doctors.However,at present,the digitalization degree of external fixators is not high in China,and most of them still rely on doctors’ experience when used.The flexibility of external fixators is low,which brings a lot of inconvenience to patients’ treatment.In this paper,the key technologies of Ortho-SUV frame are studied in depth.On this basis,the orthopedic software system with independent intellectual property rights is developed,and it is of great significance to improve the level of digital orthopedic technology in China.Firstly,this paper analyzes and plans the orthopedic treatment process,analyzes the structure of Ortho-SUV frame and calculates its degree of freedom,establishes the corresponding coordinate systems and its spatial pose model.In the forward and inverse solution of pose model,the coordinates of the hinge joints in the fixed coordinate system are directly substituted into the non-linear equations to solve,avoiding the high coupling trigonometric functions.The difficulty of solving the equations is reduced by this way,and its correctness is verified by checking calculation.Secondly,using the self-developed software,the pose of the deformed bone and the reference ring relative to the reference bone are extracted on the X-ray film,and the orthopedic medical terms are converted into mathematical symbols.The orthopedic algorithm is deduced through the kinematic analysis method and the treatment prescription is formulated.Thirdly,the movement performance of Ortho-SUV frame is studied.The workspace of Ortho-SUV frame is analyzed by Monte Carlo method.The analysis conclusion is helpful for doctors to choose different types of the frame,and its Jacobian matrix is derived.Then the singularity and dexterity of the frame in its workspace are analyzed.The results show that there is no singularity point in the workspace,the operability and dexterity of Ortho-SUV frame is good.Forthly,in view of the shortcomings of current prescription,the prescription is optimized.According to the requirement that the traction rate of 12 orthopedic points on the circumference of the deformed bone end section should not exceed the maximum allowable orthopedic rate,and the straight-line trajectory planning of the pose trajectory is carried out to obtain the shortest treatment time.The struts adjustment sequence is further optimized by genetic algorithm to reduce unnecessary stretching,and the optimized prescription report is more suitable for clinical treatment.Finally,according to the characteristics of fracture and deformity treatment,the software system scheme is determined,and the modules of database,interactive interface and orthopedic algorithm are designed in detail.Then,the Ortho-SUV frame system is used to carry out orthopedic simulation experiments of tibia and femur fracture reduction.The experimental results show that according to the orthopedic algorithm proposed in this paper and the optimized prescription,the Ortho-SUV frame system developed has good orthopedic effect and fully meets the requirements of orthopedic reduction,and is ready for clinical application.The results of this study lay a foundation for the clinical application of Ortho-SUV frame,and also have important reference value for other types of external fixator.