Application of the Superelastic NiTi Spring in Ankle Foot Orthosis (AFO) to Create Normal Ankle Joint Behavior
Abstract
:1. Introduction
2. Methods
2.1. Custom-Fit Ankle Foot Orthosis (AFO)
2.2. Motion Analysis and Data Analysis
2.3. Finite Element (FE) Modeling
3. Results and Discussion
3.1. Ankle Torque-Angle Profile
3.2. Evaluation of the Proposed AFO vs. Conventional AFO
4. Summary and Conclusions
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Model Component | Element | |
---|---|---|
Type of Element | Number of Element | |
AFO (Bottom) | 3D, Solid, Tetrahedral, Deformable | 26,437 |
AFO (Top) | 3D, Solid, Tetrahedral, Deformable | 65,179 |
Spring (4 components) | 3D, Solid, Tetrahedral, Deformable | 26,058 |
Hinge (Top) | 3D, Solid, Tetrahedral, Deformable | 13,090 |
Hinge (Bottom) | 3D, Solid, Tetrahedral, Deformable | 21,037 |
Component | Hinge | AFO | SE Spring | SS Spring |
---|---|---|---|---|
Material | Stainless steel | Plastic | Superelastic NiTi | Stainless steel |
Young’s Modulus (GPa) | 220 | 20 | 30 */40 ** | 210 |
Poisson’s Ratio | 0.33 | 0.27 | 0.33 | 0.33 |
Martensitic Start (Ms) | - | - | −65 | - |
Austenitic Start (As) | - | - | −23 | - |
Martensitic Finish (Mf) | - | - | −88 | - |
Austenitic Finish (Af) | - | - | −8 | - |
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Amerinatanzi, A.; Zamanian, H.; Shayesteh Moghaddam, N.; Jahadakbar, A.; Elahinia, M. Application of the Superelastic NiTi Spring in Ankle Foot Orthosis (AFO) to Create Normal Ankle Joint Behavior. Bioengineering 2017, 4, 95. https://doi.org/10.3390/bioengineering4040095
Amerinatanzi A, Zamanian H, Shayesteh Moghaddam N, Jahadakbar A, Elahinia M. Application of the Superelastic NiTi Spring in Ankle Foot Orthosis (AFO) to Create Normal Ankle Joint Behavior. Bioengineering. 2017; 4(4):95. https://doi.org/10.3390/bioengineering4040095
Chicago/Turabian StyleAmerinatanzi, Amirhesam, Hashem Zamanian, Narges Shayesteh Moghaddam, Ahmadreza Jahadakbar, and Mohammad Elahinia. 2017. "Application of the Superelastic NiTi Spring in Ankle Foot Orthosis (AFO) to Create Normal Ankle Joint Behavior" Bioengineering 4, no. 4: 95. https://doi.org/10.3390/bioengineering4040095