A Quasi-Passive Knee Exoskeleton to Assist During Descent

  • Emily Rogers
  • Panagiotis Polygerinos
  • Stephen Allen
  • Fausto A. Panizzolo
  • Conor J. Walsh
  • Dónal P. HollandEmail author
Conference paper
Part of the Biosystems & Biorobotics book series (BIOSYSROB, volume 16)


A pneumatic exoskeleton intended to decrease the muscle activity of the knee extensors during walking on a negative slope is presented. The device consists of an air spring that can be engaged and disengaged via a solenoid valve. When engaged, the air spring resists knee flexion. A preliminary evaluation of the device was conducted with a single healthy subject. During testing, the EMG activity of the rectus femoris decreased by 15 %, while the EMG activity of the vastus medialis increased by 8 %.


Knee Extensor Gait Cycle Swing Phase Check Valve Heel Strike 
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Copyright information

© Springer International Publishing AG 2017

Authors and Affiliations

  • Emily Rogers
    • 1
  • Panagiotis Polygerinos
    • 2
  • Stephen Allen
    • 1
  • Fausto A. Panizzolo
    • 1
  • Conor J. Walsh
    • 1
  • Dónal P. Holland
    • 3
    Email author
  1. 1.Harvard John A. Paulson School of Engineering and Applied Sciences and the Wyss Institute for Biologically Inspired EngineeringHarvard UniversityCambridgeUSA
  2. 2.Ira A. Fulton Schools of EngineeringArizona State UniversityTempeUSA
  3. 3.School of Mechanical and Materials EngineeringUniversity College DublinDublinIreland

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