A variable stiffness transverse mode shape memory alloy actuator as a minimally invasive organ positioner

2013 ◽  
Vol 222 (7) ◽  
pp. 1503-1518 ◽  
Author(s):  
W. Anderson ◽  
A. Eshghinejad ◽  
R. Azadegan ◽  
C. Cooper ◽  
M. Elahinia
Keyword(s):  
Shape Memory Alloy ◽  
Minimally Invasive ◽  
Shape Memory ◽  
Mode Shape ◽  
Variable Stiffness ◽  
Transverse Mode ◽  
Shape Memory Alloy Actuator

A novel variable-stiffness flexible manipulator actuated by shape memory alloy for minimally invasive surgery

2018 ◽  
Vol 232 (11) ◽  
pp. 1098-1110 ◽  
Author(s):  
Yanfei Cao ◽  
Feng Ju ◽  
Lei Zhang ◽  
Dongming Bai ◽  
Fei Qi ◽  
...  
Keyword(s):  
Minimally Invasive Surgery ◽  
Shape Memory Alloy ◽  
Minimally Invasive ◽  
Shape Memory ◽  
Invasive Surgery ◽  
Variable Stiffness ◽  
Flexible Manipulator ◽  
Phase Transformation Temperature ◽  
Shape Memory Alloy Wire ◽  
Alloy Wire

This article presents a novel variable-stiffness flexible manipulator for minimally invasive surgery. Each module of the proposed manipulator contains a variable-stiffness mechanism actuated by proactive deformation of shape memory alloy. Due to low driving current, apparent mechanical deformation, suitable phase transformation temperature and biocompatibility of shape memory alloy wire actuation, it is well suited for the manipulator applied in minimally invasive surgery, where variable stiffness is urgently required. In this article, the conceptual design, elastic modulus model, thermo-electric model, stiffness controlling method and finite element method simulation for a single module of the proposed variable-stiffness flexible manipulator are presented. Moreover, the memory shape setting experiment of shape memory alloy wire and fabrication of the single module are carried out. Finally, stiffness characterizations of the mechanism and the single module are studied separately, theoretically and experimentally.

scholarly journals Electromagnetic Control by Actuating Kirigami-Inspired Shape Memory Alloy: Thermally Reconfigurable Antenna application

Sensors ◽  
2021 ◽  
Vol 21 (9) ◽  
pp. 3026
Author(s):  
Minjae Lee ◽  
Sukwon Lee ◽  
Sungjoon Lim
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Fast Response ◽  
Electromagnetic Response ◽  
Reconfigurable Antenna ◽  
Thermal Stimulus ◽  
Shape Memory Alloy Actuator ◽  
Antenna Performance ◽  
Mechanical Transformation ◽  
Electromagnetic Control

Electromagnetic responses are generally controlled electrically or optically. However, although electrical and optical control allows fast response, they suffer from switching or tuning range limitations. This paper controls electromagnetic response by mechanical transformation. We introduce a novel kirigami-inspired structure for mechanical transformation with less strength, integrating a shape memory alloy actuator into the kirigami-inspired for mechanical transformation and hence electromagnetic control. The proposed approach was implemented for a reconfigurable antenna designed based on structural and electromagnetic analyses. The mechanical transformation was analyzed with thermal stimulus to predict the antenna geometry and electromagnetic analysis with different geometries predicted antenna performance. We numerically and experimentally verified that resonance response was thermally controlled using the kirigami-inspired antenna integrated with a shape memory alloy actuator.

Sign in / Sign up

Export Citation Format

Share Document