Design of SMA Actuator Based Access Device for Transanal Endoscopic Microsurgery

Hongyan Luo1, 2, *, Eric Abel2, Alan Slade2, Zhigang Wang2, Robert Steele3
1 Bioengineering College, Chongqing University, Chongqing 400044, P.R. China;
2 Division of Mechanical Enginering & Mechatronics, University of Dundee, Dundee DD1 4HN, UK;
3 Department of Surgery & Molecular Oncology, Ninewells Hospital & Medical School, University of Dundee, Dundee DD1 9SY, UK

Article Metrics

CrossRef Citations:
Total Statistics:

Full-Text HTML Views: 345
Abstract HTML Views: 433
PDF Downloads: 9
Total Views/Downloads: 787
Unique Statistics:

Full-Text HTML Views: 209
Abstract HTML Views: 271
PDF Downloads: 9
Total Views/Downloads: 489

© 2010 Luo et al.;

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Correspondence: * Address correspondence to this author at the Bioengineering College, Chongqing University, Chongqing 400044, P.R. China. Tel/Fax: 0086-23- 65111931; E-mail:


An access device using a combination of a compression coil spring made of NiTi shape memory alloy (SMA) and NiTi superelastic strips has been developed. Particular consideration is given to the application of the concept in transanal endocopic microsurgery (TEM), but it could be used in other procedures where tissue expansion is required. In TEM, it could realize the gasless dilation of the rectum with safety and reliability, and facilitate surgeons to perform TEM. The theoretical design procedure to determine the specifications of the NiTi SMA spring and superelastic components is established. The feasibility and the possible problems associated with this application are discussed generally.

Keywords: Transanal endoscopic microsurgery, Access device, NiTi compression spring, NiTi superelastic strips..