Patents Examined by Matthew Wilblin
  • Polycentric knee joint having an adjustment-free multi-stage air cylinder
    Patent number: 10918501
    Abstract: A polycentric knee joint including an adjustment-free multi-stage prosthesis air cylinder. The air cylinder has an air cylinder body, a piston assembly slidably mounted on the air cylinder body, a first check valve mounted in the piston, and a multi-stage air pressure valve mounted inside a lower air way of the air cylinder body. The multi-stage air pressure valve automatically cushions movements of the piston assembly without being adjusted whenever a user of the prosthesis joint walks slowly or quickly, for improved comfort.
    Type: Grant
    Filed: May 31, 2019
    Date of Patent: February 16, 2021
    Assignee: PRO LIMB INTERNATIONAL CORP.
    Inventor: Hsin-Fa Shen