Research On The Forced Synchronous Low-temperature Vibration Bone Drilling Driven By DC Motor

Bone drilling is the critical process of fracture reduction and fixation.However,the current medical bone drill is dominated by high speed rotation,and the cutting efficiency of drilling operation is always low,which leads to high temperature in the interface.Once the temperature is over 47?,the surrounding bone begins to change or even instantly necrotic.The injury of bone tissue not only affects the healing of the wound,but also causes the failure of the fracture fixation,which leads to the failure of the operation.Therefore,based on the theory of mechanical system dynamics,vibration testing and vibration cutting,the low-temperature bone drill prototype with the core of the forced synchronous excitation system is finally completed through design,processing,assembly and debugging.The relevant research results are as follows:Firstly,it is determined that the forced synchronous excitation is the new form of vibration output for the prototype of bone drill through discussion and analysis on the self-synchronizing mechanism of double eccentric vibration motor and its advantages and disadvantages.Through theoretical analysis and dynamic simulation,the vibration mode of the vibration bone drill is determined by the torsional vibration around the output axis.The experimental verification of the feasibility of forced synchronous torsional vibration is completed by adding eccentric gear.Secondly,the overall scheme of forced synchronous excitation under DC motor and synchronous belt drive is determined through the scheme comparison.The structure design and debugging of the whole machine is completed.Then,a prototype test platform for a complete forced synchronous torsional vibration bone drill is set up,and the vibration acceleration signal is tested.The experimental results and dynamic analysis show that,the forced synchronous excitation device can better realize the function of low temperature vibration drilling bone,and further improve the performance of the prototype,such as the efficiency and reliability.It also lays the foundation for the development of minimally invasive bone drilling technology.Finally,a temperature test system is used to test the temperature rise in the process of bone drilling.The results show that the drill bone under the auxiliary of forced synchronous torsional vibration can reduce the temperature rise and the heat damage of bone tissue.A dynamic simulation model based on ADAMS is established to further verify the feasibility of the forced synchronous torsional vibration and the related dynamic performance of the vibrating bone drill.