Structural analysis and design of micro-stirrer driven at a requested frequency for thrombus dissolution

摘要

This paper is concentrated on analysis and design of the structures of the micro-stirrer which have high performance at a requested frequency for thrombus dissolution. In this paper the new type structure of micro-stirrer which transmits the longitudinal elastic wave through catheter and converts to a bending motion at the tip stirrer is described first in order to get high performance of thrombus dissolution. Next how to design the structure which can be driven at a requested frequency without reduce the performance, because for dissolution of different type of thrombus it is necessary to drive micro-stirrers in a high performance frequency and with a certain deflection. To design and analysis the optimum structure, the modal analysis and harmonic analysis are carried on with the aid of FEM simulation. The results showed that it is possible to change the structures of the micro-stirrer to fit the requested driven frequency with keeping the high performance. The results also indicate that since the variations of design parameters are restricted rigidly, using the numerical simulation with proposed analysis model is a very efficient way to study the design of desirable structures.