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3D-printed custom-designed prostheses for partial hand amputation: Mechanical challenges still exist
Lisa O'Brien1, Emma Cho2, Aarjav Khara2
1Department Occupational Therapy, Monash University, Frankston, Victoria, Australia.
Study Design:
This is a technical report involving evaluation of two 3D-printed custom-designed prosthetic prototypes for an adult male with partial amputation of his dominant hand.
Introduction:
Prosthetic solutions for partial hand amputations have progressed modestly in comparison with advances in full hands for transradial and higher amputations. 3D-printing technology allows Bespoke prosthetic design and rapid prototyping, but evidence regarding functional performance and consumer ratings of devices is lacking.
Purpose Of The Study:
The purpose of this study was to compare grip strength, dexterity, and consumer perceptions for two novel 3D-printed devices with a myoelectric prosthesis.
Methods:
This study involves a 2-year iterative design process with an input from the participant, engineers, a prosthetist, and a hand therapist. The evaluation involved standardized tests of grip/pinch strength and dexterity and participant ratings of key criteria.
Results:
Both 3D-printed devices had very poor grip and pinch strength but comparable dexterity with the myoelectric prosthesis. The participant was more satisfied with the weight and thermal attributes of the 3D-printed devices.
Discussion:
Aspects of both 3D-printed designs showed the potential for future refinements; however, the mechanical solutions to minimize force required at the wrist to activate grip are still required.
Conclusion(S):
Future design efforts should be client-centered and involve professionals with specialist prosthetic and engineering knowledge.
