新型脑脊液引流分离装置的设计及分析

Design and Analysis of a New Cerebrospinal Fluid Drainage Separation Device

目的在现有临床引流装置基础上,对患者端引流管与引流袋端引流管连接处设计两种新型结构,对比两种结构并验证其是否满足临床使用的设计需求。方法结构1采用电磁驱动方式进行吸合,结构2采用永磁体磁化方式进行吸合,并建立静态电磁场有限元模型。比较两种结构在施加不同电流作用下的受力情况,分析其磁力线分布及磁感应强度,设计模拟实验并进行初步实验研究。结果结构1、2在吸合状态下,闭合端面处最大磁感应强度均出现在两铁芯接触位置。结构1吸力可通过电流调节,在通1 A电流时,闭合端面处最大磁感应强度为0.76 T,实验测得电磁力为6.08 N,结构2实验测得磁力为6.68 N,均小于8 N缝合线张力。结构2通过给驱动线圈供电产生反向磁场实现装置分离。结论当电流为1 A时,结构1可以满足磁吸力要求;当结构2的电流达到1.8 A时,可以实现装置分离。两种结构设计均满足临床设计需求,结构2在使用过程中更具备安全性。同时,有限元分析及实验测试验证了结构的可行性。

Objective Based on the existing clinical drainage device,two novel mechanisms were designed for the connection between the drainage tube of the patient and the drainage tube of the drainage bag,so as to compare such two mechanisms and validate whether the mechanisms can meet the design requirements for clinical use.Methods Mechanism 1 used the method of electromagnetic drive to pull in and Mechanism 2 used the magnetization method of permanent magnet to pull in.The finite element model of static electromagnetic field was established.The force of the two mechanisms under different currents was compared,and the distribution of magnetic field lines and magnetic induction intensity was analyzed.Simulation experiments were designed for preliminary experimental research.Results Under the pull-in state,the maximum magnetic induction of Mechanism 1 and Mechanism 2 at the closed end surface was found in contact area of the two iron cores.The suction force of Mechanism 1 could be adjusted by the current.When the current was 1 A,the maximum magnetic induction intensity at the closed end was 0.76 T,the electromagnetic force measured by the experiment was 6.08 N,the magnetic force of Mechanism 2 was 6.68 N,which was smaller than the 8 N suture tension.Mechanism 2 was separated by supplying the driving coil with a reverse magnetic field.Conclusions When the current was 1 A,Mechanism 1 could meet the magnetic attraction requirements,and Mechanism 2 could be separated when the current reached 1.8 A.Both mechanisms met the requirements of clinical design,but Mechanism 2 was more secure in the process of application.The feasibility of the mechanism structure was verified by finite element analysis and experimental test.