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Related Experiment Video

Updated: Nov 21, 2025

Bioelectric Analyses of an Osseointegrated Intelligent Implant Design System for Amputees
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A Prosthetic Socket with Active Volume Compensation for Amputated Lower Limb.

Ji-Hyeon Seo1,2, Hyuk-Jin Lee1, Dong-Wook Seo3

  • 1Daegu Research Center for Medical Devices, Korea Institute of Machinery and Materials, Daegu 42994, Korea.

Sensors (Basel, Switzerland)
|January 13, 2021
PubMed
Summary

A new prosthetic socket design actively compensates for residual limb volume changes, maintaining consistent socket pressure during walking. This innovation aims to improve prosthesis fit and reduce discomfort for amputees.

Keywords:
3-way pneumatic valveactive controlair bladderair flowlower limb prosthesisprosthetic socketvolume compensation

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Area of Science:

  • Biomedical Engineering
  • Prosthetics and Orthotics
  • Rehabilitation Engineering

Background:

  • Residual limb volume fluctuation is a common issue affecting prosthetic socket fit.
  • Poor socket fit can lead to pain, skin issues, and reduced mobility for amputees.

Purpose of the Study:

  • To develop an adaptive prosthetic socket that actively compensates for residual limb volume changes.
  • To maintain uniform and constant pressure distribution within the prosthetic socket during ambulation.

Main Methods:

  • Designed a prosthetic socket incorporating inflatable air bladders and a closed-loop control system.
  • Investigated mechanical properties of air bladders and performed electromagnetic analysis for pneumatic valve design.
  • Implemented a hysteresis control algorithm for precise pressure regulation.

Main Results:

  • The prosthetic socket demonstrated active volume compensation during simulated gait cycles with varying weight loads (50-90 kg).
  • Pressure recovery to the initial state was confirmed through active control.
  • Achieved a steady-state error of less than 0.75% despite a -7% to +7% change in residual limb volume.

Conclusions:

  • The developed prosthetic socket effectively manages residual limb volume fluctuations.
  • The adaptive socket technology shows promise for improving prosthetic comfort and function.
  • This innovation can potentially reduce secondary complications associated with ill-fitting prostheses.