Design Of Surgical Instruments Based On Life Cycle Theory

With the development of medical surgical robot system,the traditional surgery can be developed,but also drive the development of surgical instruments.At present,the development of surgical instruments in foreign countries is more comprehensive.The first one is the endorisk surgical instruments used by Leonardo da Vinci surgical system,which have many kinds and complete functions.However,due to the late start of the research in the field of medical surgical robots,there are also deficiencies in the research of surgical instruments.Moreover,there are some problems in the reliability of surgical instruments both at home and abroad.Therefore,based on the whole life cycle theory and some tools of reliability engineering,this paper redesigns the flexible surgical instruments.The main contents of this paper are as follows:First of all,FEMA analysis of surgical instruments is carried out on the basis of common clamp instruments,and the possible failures of surgical instruments in use are predicted and analyzed.At the same time,the risk sequence number of thesepossible failures is calculated to determine which failures have the greatest impact on the reliability of surgical instruments.At the same time,it participates in the whole life cycle process of flexible surgical instruments,including design,processing,assembly,use,recovery,etc.Classifies the faults in the process,and analyzes the causes of the faults.According to the results of two kinds of analysis,the key parts of the surgical instrument were confirmed.Secondly,the reliability test is carried out according to the confirmed key components.It mainly aims at the steel wire rope and transmission related structures of key parts.For the steel wire rope,the main purpose is to test its own properties.Therefore,three different kinds of steel wire ropes are selected for comparison.The damage time of the steel wire rope under different preload is tested and the data is analyzed.For the transmission related structures,the main task is to test and design the winding diameter of the column and the winding angle of the wire rope,and test the change process of the internal tension of the wire rope with the time with different winding diameter and winding angle of the wire rope.Then,according to the failure analysis results and test results,the flexible surgical instruments are designed.It is carried out from three aspects,one is the design of key parts of surgical instruments,the other is the design of non key parts,and the third is the improvement of interaction problems in the whole life cycle process.The design of the key parts is the most important part of the reliability of the surgical instrument.It mainly considers the data support provided by the previous test to improve.At the same time,it also improves the structure of the instrument in view of the wear of the wire rope.Non-critical components have a relatively small impact on the reliability of surgical instruments,and the relevant structures are redesigned.The interaction problem is mainly to solve the problem that the whole life cycle process of the instrument has an impact on the interaction object of the surgical instrument.Finally,the design of surgical instruments was verified.The main purpose of this paper is to carry out the follow-up simulation and analysis for the two parts of wire rope support and opening and closing shear.