A Novel Piezoelectric Ceramic Actuator with Scissoring Composite Vibration for Medical Applications

Jingjing Yang,Taojin Xu,Qiang Zhang

doi:10.3390/app9214637

Jingjing Yang, Taojin Xu + Show 1 more

Open Access

https://doi.org/10.3390/app9214637

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Abstract

This paper presents a novel scissoring composite actuator which can successfully degenerate longitudinal vibration into scissoring vibration at actuator tips for potential medical applications. The proposed actuator consists of back mass, multilayer piezoceramic stack, front mass with netted pre-stress structure and beam. The actuator is driven by only a small axially poled multilayer piezoceramic stack. Moreover, a special symmetrical grooved structure is designed at the beam end to convert longitudinal driving vibration into opposite bending vibrations at the beam tip, resulting in scissoring-type composite vibration. The converted scissoring vibration concentrates on the beam tip without any deflection along other parts, which is highly desirable for narrow-spaced medical operations. The proposed design principle is demonstrated by structural analysis and verified by different types of finite element modeling (FEM) simulations, including Eigen frequency analysis, harmonic analysis, and transient analysis. The results reveal the design effectiveness of the actuator’s structure on scissoring-type mode excitation. Finally, a prototype of the proposed piezoelectric actuator is fabricated and tested, rendering superior performance and highly reliable mode conversion. The proposed actuator exhibits potential for advanced medical applications.

Highlights

Piezoelectric ceramic actuators or vibrators, in general, and actuators with hybrid modes, in particular, are being widely utilized in a variety of fields, including ultrasonic motors [1,2], wire drawing [3], mental forming [4] and medical devices [5,6,7], due to their compact size, high power, small weight, fast response time and high precision accuracy [8,9,10]
A novel scissoring composite actuator to convert longitudinal into scissoring-type
The simulation results revealed that the as-designed actuator could excite stable scissoring vibration vibration mode

Summary

Introduction

Piezoelectric ceramic actuators or vibrators, in general, and actuators with hybrid modes, in particular, are being widely utilized in a variety of fields, including ultrasonic motors [1,2], wire drawing [3], mental forming [4] and medical devices [5,6,7], due to their compact size, high power, small weight, fast response time and high precision accuracy [8,9,10]. Several research groups aimed to design different piezoelectric actuators with longitudinal-bending type [11,12,13]. The piezoelectric elements polarized or poled in different directions separately generate longitudinal, tangential or torsional vibrations, which are subsequently combined at the output port of the actuator. The linear piezoelectric actuator with the longitudinal-bending mode is an excellent choice to achieve compact-sized devices [22]. The narrow spaces applications, such as minimally invasive surgery, do not allow unnecessary bending vibrations along the actuator apart from the effective tip bending vibration. We aimed to design a novel and miniaturized actuator to convert longitudinal vibration into bending vibration only at the actuator tip for medical applications

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