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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.

Journal of Hand Therapy : Official Journal of the American Society of Hand Therapists
|June 23, 2020
PubMed
Summary
This summary is machine-generated.

Two novel 3D-printed prosthetic prototypes for partial hand amputation showed poor grip strength but comparable dexterity to a myoelectric prosthesis. Further refinement is needed for improved mechanical function.

Keywords:
3D printingAssistive deviceProstheticTransradial

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Area of Science:

  • Biomedical Engineering
  • Rehabilitation Technology
  • Prosthetics

Background:

  • Advances in prosthetic solutions for partial hand amputations lag behind those for higher-level amputations.
  • 3D-printing enables custom prosthetic design and rapid prototyping, yet functional performance data and user feedback are limited.
  • This study addresses the need for evidence on novel 3D-printed partial hand prostheses.

Purpose of the Study:

  • To evaluate and compare the grip strength, dexterity, and consumer perceptions of two custom-designed 3D-printed prosthetic prototypes.
  • To benchmark the performance of these novel devices against a conventional myoelectric prosthesis.

Main Methods:

  • A 2-year iterative design process involving the participant, engineers, a prosthetist, and a hand therapist.
  • Standardized tests were used to assess grip/pinch strength and dexterity.
  • Participant-reported outcomes were collected for subjective criteria evaluation.

Main Results:

  • Both 3D-printed devices exhibited significantly lower grip and pinch strength compared to the myoelectric prosthesis.
  • Dexterity performance of the 3D-printed devices was comparable to the myoelectric prosthesis.
  • The participant reported higher satisfaction with the weight and thermal comfort of the 3D-printed devices.

Conclusions:

  • The evaluated 3D-printed prosthetic designs demonstrate potential for future improvements, particularly in mechanical aspects for grip activation.
  • Client-centered design incorporating specialist prosthetic and engineering expertise is crucial for future development.
  • Further research is required to overcome mechanical limitations and enhance functional capabilities of 3D-printed partial hand prostheses.