CIR casting system for making transtibial sockets

Yeongchi Wu*, Hector R. Casanova, Kim D. Reisinger, William K. Smith, Dudley S. Childress

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


This paper describes a new casting system for transtibial socket fabrication. Like the earlier CIR Sand Casting System, the CIR Casting System is based on the 'dilatancy' principle that is similar to the packaging process for coffee beans by which loose beans become a solid mass when a vacuum is applied. The main difference from the CIR Sand Casting System is that the CIR Casting System uses light-weight, polystyrene beads in place of silica sand as the primary material for casting the negative mold. The formed negative mold can be converted into a positive sand model for modification and socket formation. With the new plaster-less casting system, the prosthetist can fabricate a transtibial prosthesis in about one hour. It reduces the set-up cost, overall weight and size of the casting system, and increases portability for service in remote areas. The System also creates minimal waste and is energy-conserving and environmentally-friendly.

Original languageEnglish (US)
Pages (from-to)1-9
Number of pages9
JournalProsthetics and orthotics international
Issue number1
StatePublished - 2009


  • Appropriate technology
  • Fabriation techniques
  • Prosthetics and orthotics services in low-income countries
  • Rehabilitation of amputees
  • Transtibial prosthesis
  • Vacuum casting

ASJC Scopus subject areas

  • Health Professions (miscellaneous)
  • Rehabilitation


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