Abstract
The precise positioning design of upper limb prostheses is important for patients with upper limb disability. In this study, we propose an upper limb prosthesis with a negative pressure design. Mechanical analysis is performed to obtain the force and moment equilibrium equations. Then, the individual discipline feasible method is performed to decouple the original problem into a three-sub-discipline problem. A minimum of three shoulder straps of tension is obtained during optimization using the Isight harness scheme. The prosthetic socket can be firmly attached to the human body. Further experiments verify that the proposed device meets the basic requirements of wearing.
Highlights
Upper limb prostheses are typical shoulder prostheses that provide additional assistance and protection to patients with upper limb disability, thereby increasing the quality of life of these patients.[1,2] With the increase in the number of patients with upper limb disability, upper limb prostheses are being developed in large numbers
We propose an upper limb prosthesis with a negative pressure design
The objective function is established based on the minimum value of the total strap tension
Summary
Upper limb prostheses are typical shoulder prostheses that provide additional assistance and protection to patients with upper limb disability, thereby increasing the quality of life of these patients.[1,2] With the increase in the number of patients with upper limb disability, upper limb prostheses are being developed in large numbers. The moment balance equations are only used to calculate the arm of forces (the relative position among three straps). We set the minimum value of force between the socket and the body, Fj, as the constraint condition This step prevents F1, F2, and F3 from being infinitely small and keeps the prosthesis attached to the human body. If the number of coupling variables is relatively small, the IDF method is applicable and provides good results.[9,10] The IDF method presents the advantage of being implementable in a network.[11] This particularity can considerably improve the efficiency of the l3 is the intersection angle formed in the horizontal direction, equivalent stress point, and Coordinate. The force balance equations (7) and (8) can be simplified to qffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi
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