Page 58 - Advances in Biomechanics and Tissue Regeneration

52 3. DESIGN, SIMULATION, AND EXPERIMENTATION OF COLONIC STENTS

FIG. 3.22 Simulation of stent releasing from catheter. Images of the test (left) versus those obtained by numerical simulation (right).

3.5 MANUFACTURING AND ANIMAL EXPERIMENTATION

3.5.1 Material

The stent was manufactured from NiTi tube with a 4.5mm diameter supplied by Minitubes Ltd., Grenoble, France.
The composition was the standard superelastic 50.8 at.% Ni and 49.2 at.% Ti. In particular, for the shape memory alloy
used, and prior to any thermomechanical process, the transformation temperatures were M f ¼ 55°C, M s ¼ 38°C,
A s ¼ 17°C, and A f ¼ 2°C, so, at body temperature, the alloy was in a superelastic state.

I. BIOMECHANICS