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Using magnetic panels to enlarge a transtibial prosthetic socket.

Kendrick A Coburn1, Nicholas S DeGrasse1, Katheryn J Allyn1

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

Medical Engineering & Physics
|December 23, 2022
PubMed
Summary
This summary is machine-generated.

A new magnetic system connects prosthetic liners to adjustable sockets, helping to stabilize limb fluid volume for prosthesis users. This innovation offers a novel approach to improve prosthetic comfort and fit throughout the day.

Keywords:
AccommodationAmputeeElevated vacuumLimb volumePanel pullProsthesisResidual limbSuctionTranstibial

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Area of Science:

  • Biomedical Engineering
  • Prosthetics and Orthotics

Background:

  • Prosthetic socket fit is crucial for user comfort and function.
  • Fluctuations in limb volume can lead to poor socket fit and discomfort.
  • Existing adjustable sockets have limitations in accommodating volume changes.

Purpose of the Study:

  • To introduce and evaluate a novel magnetic system for adjustable prosthetic sockets.
  • To assess the system's ability to stabilize limb fluid volume in transtibial prosthesis users.
  • To determine the efficacy of magnetic panel pull in increasing socket volume.

Main Methods:

  • A magnetic connection system was developed, embedding magnets in socket panels and iron powder in the prosthetic liner.
  • Bench testing was performed to optimize magnet size and backplate thickness for strength-to-weight ratio.
  • The system was tested on four individuals with transtibial amputations to measure socket volume changes.

Main Results:

  • Optimized magnetic components achieved a favorable strength-to-weight ratio.
  • Magnetic panel pull resulted in a significant increase in socket volume, ranging from 5.3% to 13.8% of the initial volume.
  • The system demonstrated a meaningful increase in socket volume, particularly during sitting.

Conclusions:

  • The novel magnetic system effectively increases prosthetic socket volume.
  • This technology offers a promising strategy for stabilizing limb fluid volume in prosthesis users.
  • The magnetic panel pull mechanism represents a clinically relevant advancement in prosthetic socket design.