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A motor-driven adjustable prosthetic socket operated using a mobile phone app: A technical note.

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  • 1Department of Bioengineering, University of Washington, Seattle, WA 98195, United States.

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Summary
This summary is machine-generated.

This study presents an ambulatory adjustable socket system for individuals with trans-tibial limb loss. The device allows users to adjust prosthetic socket fit during walking, improving comfort and management of limb volume changes.

Keywords:
AmputeeClosed-loop controlPID controllerProsthesisResidual limbSocket interfaceTrans-tibialVolume accommodation

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Area of Science:

  • Biomedical Engineering
  • Prosthetics and Orthotics
  • Rehabilitation Technology

Background:

  • Limb volume fluctuations in trans-tibial amputees impact prosthetic fit and user comfort.
  • Current prosthetic sockets offer limited adjustability during ambulation, hindering effective limb volume management.

Purpose of the Study:

  • To develop and evaluate a novel ambulatory adjustable socket system for trans-tibial prosthesis users.
  • To enable incremental socket size adjustments during ambulation to improve prosthetic fit and user experience.

Main Methods:

  • A platform system with a motor-driven cable mechanism was designed for radial socket panel adjustment.
  • A mobile phone interface controlled the motor, with a proportional-integral-derivative controller managing adjustments.
  • Bench testing, treadmill trials with 16 participants, and field testing with 13 participants were conducted.

Main Results:

  • Bench tests demonstrated a maximum steady-state error of 0.036 mm under load.
  • Treadmill testing revealed clinically acceptable fit variations between 24 mm and 114 mm in cable length.
  • Field testing showed 11 of 13 participants could comfortably adjust socket size while walking.

Conclusions:

  • The developed system successfully achieves incremental socket size adjustments suitable for research and development.
  • Ambulatory adjustable sockets show promise for enhancing prosthetic fit and user satisfaction in trans-tibial amputees.