Study on a new type micro-stirrer excited by longitudinal elastic wave for thrombus dissolution

Article type: Research Article

Authors: Ajoudanian, Mohammad^{a; *} | Jiang, Zhongwei^a | Morita, Minoru^a

Affiliations: [a] Graduate School of Science and Engineering, Yamaguchi University, Ube, Yamaguchi, Japan

Correspondence: [*] Corresponding author: Mohammad Ajoudanian, Tel.: +81 836 859138; Fax: +81 836 859101; E-mail: k501wc@yamaguchi-u.ac.jp

Abstract: This paper presents the fundamental study on design of a novel micro stirrer for high effective dissolution of cerebral thrombus or blood clot. The actuator is a beam with supported one side and the other side is free. The longitudinal waves excited by a transducer from support side, travel through a beam and before reaching the tip of beam partially impinge to a slant surface. So that some of the energy of the incident longitudinal waves are reflected with different orientations from the length direction. The other energy would be converted to shear waves. Despite the elongation and bending at tip, there is no significant bending across other part of beam. The micro stirrer was evaluated by vertical tip displacement in varied mode shape with using FEM analysis. The obtained results demonstrated that the vertical motion of the stirrer at desired mode shape was less influenced by the length of actuator. Due to the attenuation of wave amplitude, a driving technique method is proposed to generate high-amplitude.

Keywords: Piezoactuator, catheter, longitudinal wave, tip deflection

DOI: 10.3233/JAE-2011-1396

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 37, no. 1, pp. 67-77, 2011