TiNi shape memory clamps with optimized structure parameters

The different treatments of TiNi shape memory alloys applied as a material for so-called TiNi clamps and their influence on substructure parameters and deformation behavior are discussed. The forces generated in fine-grained materials with higher dislocation density are stable after the cooling of t...

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Bibliographic Details
Published in:Journal of materials science. Materials in medicine 1996-11, Vol.7 (11), p.657-663
Main Authors: Filip, P., Musialek, J., Lorethov, H., Nieslanik, J., Mazanec, K.
Format: Article
Language:English
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Summary:The different treatments of TiNi shape memory alloys applied as a material for so-called TiNi clamps and their influence on substructure parameters and deformation behavior are discussed. The forces generated in fine-grained materials with higher dislocation density are stable after the cooling of the clamp to body temperature, which is a necessary condition for stable fixation of bone fragments. The forces generated and reversible strains depend on the substructure state and system stiffness parameter. The "yield point" and the "elastic moduli" are modified by controlling the B2/B19' interface mobility. The mechanical parameters obtained after annealing at 400 and 500 deg C, respectively, following the 15% cold-working reduction are optimal for the TiNi clamp design. The TiNi clamps with optimal properties have been used in a total of 68 patients. The new TiNi clamps enhanced the fixation of the bone fragments involved, helping to prevent redislocation and provide the ability for earlier active rehabilitation.
ISSN:0957-4530
1573-4838
DOI:10.1007/BF00123404