天鹅型记忆接骨器治疗肱骨骨折和骨不连的生物力学研究  

Biomechanical study of swan-like memory compressive connector for treating fractures and nonunions of humerus

作　　者：许硕贵[1] 张春才[1] 苏佳灿[1] 曾伟明[2] 顾绍德[2] 方如华[2] 张林春[2] 

机构地区：[1]第二军医大学长海医院骨科,上海200433 [2]同济大学光测力学研究室

出　　处：《第二军医大学学报》2001年第10期946-948,共3页Academic Journal of Second Military Medical University

摘　　要：目的 :研究天鹅型记忆接骨器 (SMC)治疗骨折骨不连的生物力学特征。 方法 :利用电测、二维 (2 D)、三维 (3D)光弹性技术 ,通过贴片、标定电测得到 SMC的载荷 -应变曲线 ,并通过固定新鲜人体肱骨 ,计算 SMC的动态记忆持骨力值 ;通过 2 D光弹性技术计算 SMC鹅颈加压部动态记忆加压力值 ;用精密浇铸法得到肱骨环氧树脂 3D光弹性模型 ,模仿临床使用 ,得到SMC固定下的肱骨模型 3D应力场分布 ,同时利用 L eize偏光显微镜结合三维光弹法 ,计算肱骨模型考察点 3D应力场中的 6个应力分量。 结果 :电测 SMC动态记忆持骨的生物学力值为 110 .35 N。 2 D光弹测得纵向动态记忆加压力为 16 3.88N。 3D光弹测得 SMC的鹅颈 -加压部、鹅体 -接骨板部、鹅翼 -持骨部三部相互协调 ,记忆持骨 ,形成动态 3D立体固定 ,产生全场应力分布。3D应力分离表明 SMC固定后骨折端的应力基本为正应力。结论 :SMC空间立体记忆固定的应力场 ,有利于骨折、骨不连的治疗 。Objective:To study the biomechanical basis of swan like memory compressive connector (SMC) for treating fractures and nonunions of humerus. Methods:The study was performed by electrometric, two and three dimensional (3D) photoelasticity techniques. By gauging and multiple time standardization, load strain curve was got, then the dynamic memory force of SMC was calculated. The dynamically compressive force of swan neck compressive part was calculated by 2D photoelasticity. By precision moulding, the epoxy resin 3D photoelasticity humeral model was established, then it was fixated by SMC, meanwhile, an epoxy resin cirque was used to share the continuously memorial compress. The 3D stress distribution of humeral model was got, and 6 space component stress of the inspected node was divided by Leize polarizing microscope. Results:The continuously memory force of SMC was 110.35 N. The longitudinal dynamical compressive memory force was 163.88 N. 3D photoelasticity method showed that the swan neck compressive part of SMC, swan body connecting part of SMC and swan wing holding part of SMC were in consistent with each other, memorably holding bone, 3D fixation style was formed, and overall stress distribution was produced.. Conclusion:The stress field produced by 3D memory fixation of SMC is good for the treatment of fractures and nonunions. Early function exercises are allowed, and the fracture healing is prompted.

关 键 词：动态记忆应力 天鹅型记忆接骨器 肱骨骨折 生物力学 

分 类 号：R687.32[医药卫生—骨科学] R318.01[医药卫生—外科学]