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Application of the Superelastic NiTi Spring in Ankle Foot Orthosis (AFO) to Create Normal Ankle Joint Behavior

التفاصيل البيبلوغرافية
العنوان: Application of the Superelastic NiTi Spring in Ankle Foot Orthosis (AFO) to Create Normal Ankle Joint Behavior
المؤلفون: Amirhesam Amerinatanzi, Hashem Zamanian, Narges Shayesteh Moghaddam, Ahmadreza Jahadakbar, Mohammad Elahinia
المصدر: Bioengineering, Vol 4, Iss 4, p 95 (2017)
بيانات النشر: MDPI AG, 2017.
سنة النشر: 2017
المجموعة: LCC:Technology
LCC:Biology (General)
مصطلحات موضوعية: superelastic NiTi spring, Ankle Foot Orthosis (AFO), normal ankle joint behavior, Technology, Biology (General), QH301-705.5
الوصف: Hinge-based Ankle Foot Orthosis (HAFO) is one of the most common non-surgical solutions for the foot drop. In conventional HAFOs, the ankle joint is almost locked, and plantar flexion is restricted due to the high stiffness of the hinge mechanism. This often leads to a rigid walking gate cycle, poor muscle activity, and muscle atrophy. Since the ankle torque-angle loop has a non-linear profile, the use of a superelastic NiTi spring within the hinge, due to its nonlinear behavior, could recreate a close-to-normal stiffness of the normal ankle joint, which, in turn, could create a more natural walk. The focus of this study is to evaluate the performance of a superelastic NiTi spring versus a conventional Stainless Steel spring in a hinge mechanism of a custom-fit HAFO. To this aim, a custom-fit HAFO was fabricated via the fast casting technique. Then, motion analysis was performed for two healthy subjects (Case I and Case II): (i) subjects with bare foot; (ii) subjects wearing a conventional HAFO with no spring; (iii) subjects wearing a conventional Stainless Steel-based HAFO; and (iv) subjects wearing a NiTi spring-based HAFO. The data related to the ankle angle and the amount of moment applied to the ankle during walking were recorded using Cortex software and used for the evaluations. Finally, Finite Element Analysis (FEA) was performed to evaluate the safety of the designed HAFO. The NiTi spring offers a higher range of motion (7.9 versus 4.14 degree) and an increased level of moment (0.55 versus 0.36 N·m/kg). Furthermore, a NiTi spring offers an ankle torque-angle loop closer to that of the healthy subjects.
نوع الوثيقة: article
وصف الملف: electronic resource
اللغة: English
تدمد: 2306-5354
Relation: https://www.mdpi.com/2306-5354/4/4/95; https://doaj.org/toc/2306-5354
DOI: 10.3390/bioengineering4040095
URL الوصول: https://doaj.org/article/16ee1de849fe43079fc521557fd4cf5b
رقم الأكسشن: edsdoj.16ee1de849fe43079fc521557fd4cf5b
قاعدة البيانات: Directory of Open Access Journals
الوصف
تدمد:23065354
DOI:10.3390/bioengineering4040095