Drilling Performance Of Minimally Invasive Small Holes In Skull For Deep Brain Stimulation

Aiming at the problems of low positioning accuracy and large skull tissue damage caused by backward drilling and puncture equipment in deep thalamic low-nuclear brain stimulation surgery,the movement process is studies in this paper of skull drilling and the production of drilling in combination with the minimally invasive drilling of the skull.The effect of the drilling force on the skull tissue at different times was analyzed,and the range of the skull stress and strain during the process of the minimally invasive small hole in the skull was obtained.The precision testing of the drilling and puncturing platform proved the reliability of the drilling and puncturing platform;the skull minimally invasive small hole drilling experiment combined with clinical surgical conditions selected appropriate drilling process parameters and formulated the drilling force optimization scheme,which resulted in Optimal combination of drilling process parameters with minimal drilling force.Combined with the drilling experiment of the minimally invasive small hole in the skull,the movement process of the skull drilling and the drilling force generated by the drilling were studied.Analyze the drilling,drilling and drilling process of the skull,and use MATLAB software to plot the movement track of a point on the cutting edge of the drill during the drilling process.Theoretical analysis of the drilling force is performed to obtain the axial force is the main factor for skull injury.According to SolidWorks software and Mimics medical imaging software,threedimensional modeling of medical standard twist drill and skull was completed,and ANSYS Workbench finite element software was used to simulate the drilling process of minimally invasive small holes in the skull,and the skull was obtained during the drilling process.The maximum influence range of stress and strain is 5mm.A minimally invasive small hole drilling and puncture platform for skull was designed and built,and the accuracy of the platform was tested to verify the reliability of the platform.The speed of the drilling platform was established to obtain the audio of the paper strip hitting the column during the spindle rotation.And use Adobe Audition software to identify the audio to obtain the audio wave crest characteristics,so as to determine the spindle speed of the machine tool spindle is 700 r/min,1000 r/min,1300 r/min,1600 r/min spindle speed knob position;Based on the clinical operation conditions,a suitable range of drilling process parameters was selected,an orthogonal experiment plan was developed,and the drilling experiment was completed according to the plan.The "dark" change in the drilling force during the skull drilling experiment was obtained.Minitab software was used.The drilling force results were optimized and the optimal drilling process parameter combination was obtained as n(1600 r/min)f(10 mm/min)?(0 °).During the drilling process of the skull,it was found that The crumbs are in strips,and the spiral grooves of twist drills are filled with crumbs.From the cross-section of the skull,it is concluded that the skull is divided into cortical bone,cancellous bone and cortical bone.