Objective The existing clinical drainage device was improved, two new structures were designed and finite element analysis was performed, and the two structures were compared and verified to meet the design requirements for clinical use. Methods The new structures 1 and 2 adopt electromagnetic driving method and permanent magnet magnetization method to pull in, establish a finite element model, compare the force conditions of the two structures under the application of different current magnitudes, analyze the magnetic field line distribution and magnetic induction intensity cloud diagram, design The simulation experiment is used for preliminary experimental research. Results The simulated electromagnetic force was 6.35 N when the mechanism passed a 1A current, and the experimental value was 6.08 N. The maximum magnetic induction intensity appeared at the contact surface between the two iron cores. In mechanisms 2, the simulated electromagnetic force is 6.89N, and the experimental value is 6.68N. The magnetic induction intensity is concentrated in the permanent magnet-iron core section. Conclusion Both structural designs are in line with clinical design requirements, and the second structure is more secure during use, which greatly reduces the risk of drainage. At the same time, the finite element analysis and experimental tests verify the feasibility of the structure.