The Designment Of Location Device And The Research Of Its Application In The Removal Of Metallic Foreign Bodies

BackgroundWith the appearance of the concept of "precision medicine",surgeons and patients have increasingly rigorous requirements for surgery.Accurate localization can make the diseases which are unable to operate by traditional methods curable,simplify complex operations,reduce surgical trauma for patients and reduce the operation time.However,the location devices on the market still have many problems,such as low localization accuracy,large amount of X-ray radiation exposure and high equipment cost.PurposeDesigning a new surgical location device to improve the localization accuracy and reduce the radiation exposure of surgeons and patients.Providing a low-cost,high-quality device that primary hospitals are also affordable.Besides,the location device was applied to the removal of metallic foreign bodies in limbs to verify the accuracy and effectiveness of the location device.Methods1.The main part of the location device is designed in SolidWorks software,which include the locating base,locating arm and locating sleeve needle.The locating base and locating arm are manufactured by the Fused Deposition Modeling(FDM)3D printer.The locating sleeve needle has three parts,which include the outer sleeve,inner sleeve and locating needle.The outer sleeve and inner sleeve are manufactured by fine machine.The locating needle is a medical Kirschner wire with a diameter of 1.5 mm.The 3-axis translation sliding table is a self-assembly device,which can control the locating device to translate along the X,Y and Z axes.The locating principle of this locating device is verified in the Mimics software.2.A cross laser bracket used with C-arm was designed and manufactured for auxiliary positioning.In this study,10 sides of the upper and lower extremity specimens of adult corpses were used,and 65 metal balls with a diameter of 2.0 mm were inserted.This experiment was divided into the experimental group which was the locating result of the 65 foreign bodies and the control group which was the assumed optimal location result,that is,the actual location deviation distance(D2)of the 65 foreign bodies was all assumed to be 0.The 65 foreign bodies were located by the locating device assisted with C-arm.Then,a thin layer CT scan and 3D reconstruction were performed.The location deviation distance(D1)was measured in the Mimics software and the actual location deviation distance was calculated.The localization accuracy was obtained.And the fluoroscopy time(T1)and removal time of the foreign body(T2)were recorded.Therefore,the localization effect of the locating device is evaluated.Results1.The locating device can control the 3-axis translation sliding table outside the operating room,and then control the movement of the whole device.The simulated locating experiment is conducted in the Mimics software,and the target point is precise located.2.All the 65 cases of metallic foreign bodies were removed.The localization accuracy of the locating device is 2.3mm,D2=1.30±0.61 mm,T1=46.06± 18.44 s,T2=177.l0±65.87 s.Conclusions1.The feasibility of the locating principle of the locating device has verified in the Mimics software.With the assistance of this device and C-arm,the precise localization of target point in space can be realized.2.The location device has been preliminarily applied to the locating of metallic foreign bodies in deep soft tissues of human limbs specimens.And the preliminary verification shows that this device has high localization accuracy which can reduce X-ray exposure to doctors and patients,and the price is low.So,it has great promotional and application value.