To improve the crutches design from the existing prototype

Md Isa, Nur Sarah Farisya (2023) To improve the crutches design from the existing prototype. Project Report. Melaka, Malaysia, Universiti Teknikal Malaysia Melaka. (Submitted)

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Abstract

Crutches are very important for patient with leg injuries and crutches are very useful as an aid to users or patients to walk and perform daily activities. If viewed in terms of a crutch, it is a long stick with a crosspiece at the top that a person with an injury or handicap uses as a support under the armpit. The main problem often faced by users of crutches is discomfort on the handle part and the crutch tip is less stable. The purpose of this project is to design improvements to an existing forearm crutch and analyse the displacement, factor of safety and Von Mises stress using Solidwork software. The method used was survey conducted in several private hospitals in Negeri Sembilan and design the improved crutches using SolidWorks software. The result for this study, Aluminium Alloy is used for the shaft and the knee rest. The material used for the hand cuff and handle is Nylon and Neoprene is used as the padding for the hand cuff, handle, and knee rest. For the results, the maximum and minimum value of Von Mises stress on the handle is 9.713e+07 N∕m^2 and 3.852+04 N/m^2, shaft is 1.506e+07 N/m^2 and 1.116e+00 N/m^2, knee rest is 2.944e+08 N/m^2 and 1.763e+05 N/m^2. The maximum displacement value for handle is 7.435e+10 mm and minimum 1.493e+09 mm, shaft is 1.001e+02 mm and 1.000e+02 mm, and knee rest is 1.269e+00 mm and 1.000e-30 mm. The factor of safety for the handle is 1.4, shaft is 1.9 and knee rest is 0.094. In conclusion, the improvements on the forearm crutch can be made by changing the design, material, and mechanisms.

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