仿生非光滑注射器针头注射过程接触有限元模拟

Contact finite element simulation of bionic non-smooth injector needle during injection process

应用接触非线性有限元方法对普通针头及两种分别具有锯齿形和波纹形仿生非光滑表面针头的注射过程进行了数值模拟,求得了软组织在该过程中应力、速度、动能和内能的变化时间历程,直观描述了非光滑表面对针头在注射这一动态过程中的影响。通过三种针头的对比和分析表明,仿生非光滑针头具有减阻和减痛效果,并且具有波纹形非光滑表面的针头效果更加明显,与试验研究结果吻合。

The numerical simulations were performed for the injection process of the common injector needle and two kinds of injector needles with zigzag and wave shape non-smooth surfaces using the non-linear contact finite element method.The histories of the stress,the velocity,the kinetic energy,and the internal energy in the human soft tissue were obtained,demonstrating intuitively the effects of the non-smooth surface during the dynamic process of injection.Comparison among these three kinds of injector needles showed that the bionic non-smooth injector needles are characterized by less drag and more effective pain allviation than common needle.The wave shape non-smooth surface is better than zigzag shape surface,being in agreement with experiment result.