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A Release/Relock Socket to Enhance Volume Management and Facilitate Patient Self-Care

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Technical Report,01 Sep 2018,31 Aug 2019

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University of Washington Seattle United States

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Residual limb volume loss during the day is an important challenge faced by Warfighters with transtibial limb amputation. Partial doffing the prosthesis during resting may facilitate recovery and retention of residual limb fluid volume. The purpose of this research is to develop a system to allow for easy locking pin and socket panel release during sitting and quick relock upon standing. The system was designed, fabricated, and pilot tested. A motor-driven system 300 g housed within the socket adjusts locking pin tether length, and an instrumented ratcheting dial adjusts socket panel positions. The user operates the releaserelock system using buttons and a dial on the socket. Pin tether length and ratcheting dial rotation adjustments are recorded on board for later analysis. Testing on three people with transtibial amputation demonstrated that locking pin release 5 cm partial doffing was accomplished within1.5 s and socket relock within 1.5 s. During relock, participants preferred to pull in the locking pin tether and then tightened the socket panels rather than vice versa.

Subject Categories:

  • Anatomy and Physiology
  • Medicine and Medical Research

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