scholarly journals Chitosan scaffolds with a shape memory effect induced by hydration

2014 ◽  
Vol 2 (21) ◽  
pp. 3315-3323 ◽  
Author(s):  
Cristina O. Correia ◽  
João F. Mano
Keyword(s):  
Minimally Invasive Surgery ◽  
Minimally Invasive ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Invasive Surgery ◽  
Porous Scaffolds ◽  
Chitosan Scaffolds

Chitosan-based porous scaffolds exhibit a shape memory effect triggered by hydration, and they are candidates for applications in minimally invasive surgery.

scholarly journals Fabrication and Shape Memory Characteristics of Highly Porous Ti-Nb-Mo Biomaterials

2017 ◽  
Vol 62 (2) ◽  
pp. 1367-1370 ◽  
Author(s):  
Y.-W. Kim ◽  
T.W. Mukarati
Keyword(s):  
Martensitic Transformation ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Differential Scanning Calorimetric ◽  
Porous Scaffolds ◽  
High Porosity ◽  
Porous Ti ◽  
Human Body Temperature ◽  
Rapidly Solidified

AbstractNon-toxic Ti-Nb-Mo scaffolds were fabricated by sintering rapidly solidified alloy fibers for biomedical applications. Microstructure and martensitic transformation behaviors of the porous scaffolds were investigated by means of differential scanning calorimetric and X-ray diffraction. Theα″–βtransformation occurs in the as-solidified fiber and the sintered scaffolds. According to the compressive test of the sintered scaffolds with 75% porosity, they exhibit good superelasticity and strain recovery ascribed to the stress-induced martensitic transformation and the shape memory effect. Because of the high porosity of the scaffolds, an elastic modulus of 1.4 GPa, which matches well with that of cancellous bone, could be obtained. The austenite transformation finishing temperature of 77Ti-18Nb-5Mo alloy scaffolds is 5.1°C which is well below the human body temperature, and then all mechanical properties and shape memory effect of the porous 77Ti-18Nb-5Mo scaffolds are applicable for bon replacement implants.

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.

SHAPE MEMORY EFFECT AND PIEZOELECTRIC EFFECT OF POLYMER COMPOSITE MATERIALS BASED ON POLYLACTIDE FOR ADAPTIVE MEDICAL STRUCTURES

2021 ◽  
Vol 1 (19) ◽  
pp. 27-29
Author(s):  
F.S. Senatov ◽  
R.A. Surmenev ◽  
I.О. Pariy
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Polymer Composite ◽  
Piezoelectric Effect ◽  
Activation Parameters ◽  
Polymer Composite Material ◽  
Porous Scaffolds

The activation parameters of the Shape memory effect of polylactide were reduced by creating a polymer-polymer composite material based on it. The improved material was used to obtain porous scaffolds by electro-spinning, the shape memory effect and the piezoelectric effect were studied for these scaffolds.

Mechanical properties and shape memory effect of 3D-printed PLA-based porous scaffolds

2016 ◽  
Vol 57 ◽  
pp. 139-148 ◽  
Author(s):  
F.S. Senatov ◽  
K.V. Niaza ◽  
M.Yu. Zadorozhnyy ◽  
A.V. Maksimkin ◽  
S.D. Kaloshkin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Porous Scaffolds ◽  
3D Printed

scholarly journals A Novel Shape Memory Alloy Annuloplasty Ring for Minimally Invasive Surgery: Design, Fabrication, and Evaluation

2010 ◽  
Vol 39 (1) ◽  
pp. 367-377 ◽  
Author(s):  
Molly F. Purser ◽  
Andrew L. Richards ◽  
Richard C. Cook ◽  
Jason A. Osborne ◽  
Denis R. Cormier ◽  
...  
Keyword(s):  
Minimally Invasive Surgery ◽  
Shape Memory Alloy ◽  
Minimally Invasive ◽  
Shape Memory ◽  
Invasive Surgery ◽  
Annuloplasty Ring
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