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Development of an Electronically Controlled Knee-Type Prosthetic Leg with a 4-Bar Linkage Structure for Lower Limb Amputee

대퇴 절단 장애인을 위한 4절 링크 구조의 전자 제어식 무릎형 의족

  • Ji-Woon Lee (Department of Medical Robotics, Korea Institute of Machinery & Materials / Department of Mechanical Engineering, Kyungpook University) ;
  • Hyun-Soo Woo (Department of Medical Robotics, Korea Institute of Machinery & Materials) ;
  • Dong-Young Ahn (Prosthetics and Orthotics Center, Veterans Health Service Medical Center) ;
  • Min Jo (Prosthetics and Orthotics Center, Veterans Health Service Medical Center) ;
  • Hak Yi (School of Mechanical Engineering, Kyungpook National University) ;
  • Ki-Young Kim (Department of Medical Robotics, Korea Institute of Machinery & Materials)
  • Received : 2023.07.27
  • Accepted : 2024.02.22
  • Published : 2024.05.31

Abstract

Lower limb amputees are increasing due to various reasons. It is difficult for lower limb amputees to walk without an assistive device such as a prosthetic leg. In this paper, an electronically controlled knee-type prosthetic leg with a 4-bar linkage structure for lower limb amputees was developed. The knee-type prosthetic leg has a 4-bar linkage structure and assists walking by using an integrated drive module. The torque is 90 Nm, the rotation speed is up to 120 deg, and it weight 1.9 kg, so it is lighter than a commercial prosthetic leg, so it can be used for a long time because there is less fatigue when walking. An integrated control board was developed by applying various sensors and microprocessor. The motor drive and encoder are built into the integrated drive module. The integrated control board and integrated drive module communicate using CAN. When a lower limb amputee wears a knee-type prosthetic leg and walks, it shows a shape similar to the swing phase graph of a normal people, and it is possible to walk naturally while walking.

Keywords

Acknowledgement

This work was supported by the Korea Medical Device Development Fund grant funded by the Korea government (the Ministry of Science and ICT, the Ministry of Trade, Industry and Energy, the Ministry of Health & Welfare, the Ministry of Food and Drug Safety) (Project Number: 1711195609, RS-2020-KD000158).

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