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A Biologically Inspired Knee Actuator for a KAFO
     
  
  
刊名:
Journal of Medical Devices
作者:
Tian, Feng
(Univ Toledo, Coll Engn, Dept Bioengn, Biomech & Assist Technol Lab, 2801 W Bancroft St,NI 5051, Toledo, OH 43606 USA)
Hefzy, Mohamed Samir
(Univ Toledo, Coll Engn, Dept Bioengn, Biomech & Assist Technol Lab, 2801 W Bancroft St,NI 5051, Toledo, OH 43606 USA)
Elahinia, Mohammad
(Univ Toledo, Coll Engn, Dept Mech Ind & Mfg Engn, Dynam & Smart Syst Lab, 1610 N Westwood,MS 312, Toledo, OH 43607 USA)
刊号:
611B0028
ISSN:
1932-6181
出版年:
2016
年卷期:
2016, vol.10, no.4
总页数:
8
分类号:
R318.6
语种:
eng
文摘:
Knee-ankle-foot orthoses (KAFOs) are prescribed to improve abnormal ambulation caused by quadriceps weakness. There are three major types of KAFOs: passive KAFOs, semidynamic KAFOs, and dynamic KAFOs. Dynamic KAFOs are the only type that enables to control knee motions throughout the entire walking gait cycle. However, those available in the market are heavy, bulky, and have limited functionality. The UT dynamic KAFO is developed to allow knee flexion and assist knee extension over the gait cycle by using a superelastic nitinol actuator, which has the potential to reduce volume and weight and reproduce normal knee behavior. In order to match the normal knee stiffness profile, the dynamic actuator consists of two actuating parts that work in the stance and swing phases, respectively. Each actuating part combines a superelastic torsional rod and a torsional spring in parallel. Geometries of the two superelastic rods were determined by MATLAB-based numerical simulations. The simulation response of the dynamic actuator was compared with the normal knee stiffness, verifying that the proposed design is able to mimic the normal knee performance. The surrounding parts of the dynamic knee joint have then been designed and modeled to house the two actuating parts. The dynamic knee joint was fabricated and mounted on a conventional passive KAFO, replacing its original knee joint on the lateral side. Motion analysis tests were conducted on a healthy subject to evaluate the feasibility of the UT dynamic KAFO. The results indicate that the UT dynamic KAFO allows knee flexion during the swing phase of gait and provides knee motion close to normal.
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