Development of a Two-way Shape Memory Actuator for Transanal Endoscopic Surgery

H. Luo, E. Abel, J. Hewit, R.J.C. Steele, A. Slade, and Z. Wang (UK)


Biomechanics modelling, shape memory alloy, training methods, transanal endoscopic surgery


A possible means of dilating the rectal cavity without insufflation and controlling its expansion through the use of two-way shape memory NiTi alloy was considered for transanal surgery. Along with the general discussion about the specific requirements for two-way shape memory alloy and the related problems in this application, it focuses on the key problem of how to get the two-way shape memory alloy with the desired hot and cold shapes at the required transformation temperatures. Four different methods for training two-way shape memory NiTi alloy have been investigated and compared from the viewpoint of the application. Experimental results indicated that the combined shape memory effect and pseudoelastic effect cycling is the optimal training procedure. Some improvements to the training details such as the applied stress and the temperature at which it is imposed during training, need to be considered.

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