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Related Experiment Videos

Memory plastics for prosthetic and orthotic applications.

A G Coombes1, C D Greenwood

  • 1Bioengineering Centre, University College, London.

Prosthetics and Orthotics International
|December 1, 1988
PubMed
Summary

This study introduces shrink forming for prosthetic sockets using memory plastics, reducing manual skill and eliminating the need for specialized vacuum machines. The novel method offers durable, high-load capacity prosthetic solutions for lower limb applications.

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Area of Science:

  • Biomaterials Engineering
  • Prosthetics and Orthotics
  • Polymer Science

Background:

  • Traditional prosthetic socket fabrication methods like drape forming and the Rapidform process have limitations.
  • Drape forming requires significant manual skill, while the Rapidform process necessitates specialized vacuum forming equipment.

Purpose of the Study:

  • To present two novel methods for producing thermoplastic prosthetic sockets using heat shrinkable preforms.
  • To evaluate the performance of shrink-formed sockets for lower limb applications.

Main Methods:

  • Method 1: Utilizes established heat shrink technology with crosslinked thermoplastics.
  • Method 2: Employs a blowmoulding technique for simplified, single-stage preform manufacture.
  • Fabrication of sockets for load-bearing, flexible ISNY type, and rigid transparent check applications.

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Main Results:

  • Shrink-formed, load-bearing sockets exceeded Philadelphia Static Load Levels (ISPO, 1978) in static testing.
  • Fatigue testing indicated a significant potential for long service life in the fabricated sockets.

Conclusions:

  • Shrink forming offers a viable and advantageous alternative for prosthetic socket production.
  • The developed methods reduce fabrication complexity and equipment requirements while ensuring high performance and durability.