弯曲参数对软组织缝合过线器弯钩力学性能的影响
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1.上海理工大学;2.上海博进凯利泰医疗科技有限公司

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上海市生物医学工程研究生示范实践基地(1017308011)


The influence of bending parameters on the mechanical properties of the hook of the soft tissue suture passer
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1.University of Shanghai for Science and Technology;2.Shanghai BJ-KMC Medical Technology Co., Ltd.

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    摘要:

    目的 探究弯钩偏转角和弯钩倾斜角对软组织缝合过线器弯钩力学性能的影响,为软组织缝合过线器的优化设计提供理论依据。方法 以远离针尖端端面(端面1)为研究对象,建立以力矩大小为因变量,弯钩偏转角和倾斜角为自变量的数学模型。探究偏转角和倾斜角为0°、10°、20°和30°时的力矩大小,并用数学模型求解出力矩值。基于有限元分析法,使用Solidworks软件建立偏转角和倾斜角为0°、10°、20°和30°的16种弯钩三维几何模型,导入Ansys Workbench有限元分析软件进行应力分析,在相同穿刺力作用下,求解出各弯钩最大等效应力和远离针尖端端面的反作用力矩值。结果 理论分析与数值模拟分析结果均表明端面1的反作用力矩随着偏转角的增大而增大,随着倾斜角的减小而减小。当弯钩偏转角为0°、弯钩倾斜角为30°时,端面1的反作用力矩取得最小值(25.23N?mm)。有限元分析结果显示,当偏转角为0°时,弯钩最大等效应力值不随弯钩倾斜角的变化而变化,且为最小值(62.65MPa)。结论 弯钩最大等效应力和端面1的反作用力矩值随偏转角的增大而增大,随倾斜角的减小而减小。所建数学模型可以准确的说明弯钩端面1处力矩大小与弯钩偏转角和倾斜角的关系。

    Abstract:

    Objective The purpose of the research aims to explore the influence of hook deflection angle and hook inclination angle on the mechanical properties of the hook of soft tissue suture passer, and to provide theoretical basis for the optimal design of soft tissue suture passer. Methods Taking the end face (end face 1) far away from the tip of the needle as the research object, a mathematical model is established with the torque value as the dependent variable and the hook deflection angle and inclination angle as the independent variable. The torque value is solved by the mathematical model when the deflection angle and inclination angle are 0°, 10°, 20° and 30°. Based on the finite element analysis method, 16 kinds of hook three-dimensional geometric models with deflection angle and inclination angle of 0°, 10°, 20° and 30° are established by SolidWorks software. The stress analysis is carried out by ANSYS Workbench software. Under the same puncture force, the maximum equivalent (von-Mises) stress of each hook and the reaction moment of end face far away from the tip of the needle are calculated. Results The results of theoretical analysis and numerical simulation show that the reaction moment of end face 1 increases with the increase of deflection angle and decreases with the decrease of inclination angle. The hook with deflection angle of 0° and inclination angle of 30° had minimum reaction moment (25.23N?mm). The results of finite element analysis show, when the deflection angle is 0°, the maximum equivalent stress of the hook does not change as the change of the inclination angle of the hook, and it is the minimum value of 62.65MPa. Conclusions The maximum equivalent stress of hook and the reaction moment of end face 1 increase with the increase of deflection angle and decrease with the decrease of inclination angle. The established mathematical model can accurately explain the relationship between the moment at the end face of the hook and the deflection angle and inclination angle of the hook.

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  • 收稿日期:2020-05-13
  • 最后修改日期:2020-07-07
  • 录用日期:2020-07-16
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