锁定螺钉不同头部角度对钉板系统力学性能的影响  

Effects of Locking Screws with Different Head Angles on Mechanical Properties of Screw-Plate System

作　　者：季东升 郑云 霍尔凡 邢鸿雁 JI Dongsheng;ZHENG Yun;HUO Erfan;XING Hongyan(Tianjin Key Laboratory of Integrated Design and On-Line Monitoring for Light Industry&Food Machinery and Equipment,School of Mechanical Engineering,Tianjin University of Science and Technology,Tianjin 300222,China;Tianjin Naton Institute of Medical Technology,Tianjin 300308,China)

机构地区：[1]天津科技大学机械工程学院,天津市轻工与食品工程机械装备集成设计与在线监控重点实验室,天津300222 [2]天津纳通医学科技研究院,天津300308

出　　处：《医用生物力学》2020年第2期223-227,共5页Journal of Medical Biomechanics

摘　　要：目的探究锁定螺钉的头部角度以及锁定次数对钉板系统力学性能的影响,为医生在临床手术过程中选用适当锁定螺钉和把控锁定次数提供理论依据。方法选用具有不同头部角度的锁定螺钉与同种接骨板配合,并进行不同次数的锁定,通过悬臂弯曲试验,比较各组试件力学性能的差异。结果头部角度不同的锁定螺钉与锁定加压接骨板配合后的失效载荷与抗弯刚度存在显著性差异(P<0.05),锁紧程度最佳的钉板系统的力学性能最优;钉板配合进行3次锁定与进行1次锁定之间显著性差异不明显(P>0.05);不同头部角度锁定螺钉在不同锁定次数情况下的螺钉失效形式存在差异,锁定螺钉失效形式与其头部角度以及锁定次数正相关。结论头部角度不同的锁定螺钉与锁定加压接骨板配合后力学性能的差异性不容忽视,医生在临床过程中选用锁紧程度最佳的锁定螺钉与锁定加压接骨板,并选用合适扭矩的限力扳手酌情进行多次锁定,避免螺钉松动影响患者康复。Objective To investigate the effects from head angle and locking times of locking screws on mechanical properties of the screw-plate system,so as to provide a theoretical basis for doctors to select appropriate locking screws and master the locking times in clinical surgical procedure.Methods Locking screws with different head angles were selected to match with locking compression plates in the case of different locking times,and cantilever bending method was used to compare the differences of mechanical properties in each group.Results There were significant differences in failure load and bending stiffness between locking compression plate and locking screw with different head angles(P<0.05).The mechanical properties of the screw-plate system with the best locking degree were optimum.There was no significant difference between 3 time-locking and 1 time-locking(P>0.05).The failure modes of locking screw with different head angles and different locking times were different,and the failure mode of locking screw had a positive correlation with its head angle and locking times.Conclusions The differences in mechanical properties between locking screw with different head angles and locking compression plate cannot be neglected.It is suggested that doctors should choose locking screw and locking compression plate with the best locking degree in clinical procedure,and choose the right torque wrench to lock in multiple times if necessary,thus to prevent screw loosening from affecting recovery of the patients.

关 键 词：锁定螺钉 钉板系统 悬臂弯曲 力学性能 

分 类 号：R318.01[医药卫生—生物医学工程]