Development And Related Basic Research Of The New Spinal Deformity Correction System

Background: Spinal deformity is a common and frequently occurring disease and could significantly affect patient’s life.So far,for those patients who need operation the main method is by the use of pedicle screw and rod system.However,there are still potential complications such as spinal cord and nerve damage and so on.To overcome the drawbacks of this technique,for example highly relies on the surgeon’s experiences and techniques,higher operation risk,longer learning curve,and higher surgical requirement.It is necessary to develop a new correction system made by memory alloy.With special instruments could help better,it performing the correction surgery for different ages,different causes and types deformity cases,meanwhile enlarge the surgical indication.We aim to inaugurate a new spinal correction method which is safe,simple,effective and easy to spread to primary hospitals,and to provide a new idea for the spinal deformity surgery.Objectives:Estimating the mechanical property、safety、effectiveness and superiority of the new spinal correction system.We aim to inaugurate a new spinal correction method which is safe,simple,effective and easy to spread to primary hospitals,and to provide a new idea for the spinal deformity surgery.Methods:Based on the anatomical research about cadavers、CT images and longlin pigs、the earlier research results and the the preliminary works,research group developed a new hook and rod spinal deformity correction system.It could overcome those drawbacks of the devices available now in market and could be a valuable supplement.The new method treat every segment as a unit and implant the hook into the bilateral transverse process or laminate of each vertebrae need correction,connecting the rod with hook by the multidirectional groove,altogether forming a three-demensional system.We’ll compare it with the screw and rod system by a series of searches such as anatomy,relevant mechanical parameter,mechanics of materials,biomechanical experiments(relevant biomechanical mechanism),mechanical tests(fatigue tests and comparison of pullout strength),finite element analysis to verify its safety,efficiency,and superiority.Results:The experimental results showed as follows:(1)There was no significant difference by comparing the spinal date of adult Long lin pig and human,such as distance between transverse process 、 perimeter of transverse process 、 length of transverse process and width of vertebral lamina,which prompted they are similar and the new correction system could be tested in the long lin pig.(2)After the related research,we completed the new spinal deformity correction system and achieved the invention patent.(3)Technical theory results:With the new system,it just show the transverse process or laminate,greatly reduce the risk of surgery,reduce complications,improve safety and then inaugurate a new technology of surgery without implanting pedicle screw or penetrating into spinal canal.Comparing with traditional method to verify its superiority.Providing theoretical basis and clinical experience for the new treatment of spinal deformity.(4)Comparing with pedicle screw and rodsystem,the improved spinal correction system is preponderant on orthopedic force,stability and controlling the direction of activity which means good efficiency of correction and fixation.(5)Verifying that improved spinal correction system has enough mechanical property meeting the requirements of biological internal fixation device by mechanical analysis.It is also preponderant about pull-out strength,rigidity and holding force.(6)Verifying that improved spinal correction system has enough mechanical property meeting the requirements of biological internal fixation device by finite element analysis.Conclusion: Proving that the new spinal correction system is safe,efficient and superior.Providing theoretical support and biomechanical basis for widely application.It’s hopeful to develop a safe,simple and efficient method of spinal deformity surgery that could be generalized to primary hospitals easily.It also provides a new idea for spinal deformity surgery.In conclusion,it has great practical value and broad application prospects.