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A motor-driven adjustable prosthetic socket operated using a mobile phone app: A technical note
Joan E Sanders1, Joseph L Garbini2, Jake B McLean1
1Department of Bioengineering, University of Washington, Seattle, WA 98195, United States.
Medical Engineering & Physics
|April 28, 2019
Summary
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.
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.
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