Contact force controlled orthoses made of nitinol shape memory alloy wire for the treatment of malformed ears

A. Hanafusa, H. Takahashi, Y. Sekiguchi, M. Nozaki, T. Dohi

Research output: Contribution to journalArticle

Abstract

Malformed ears of neonates can be effectively treated by employing a suitably shaped orthosis Orthoses made of nitinol shape memory alloy wire and a computer-assisted design system to manufacture the orthosis have been developed. By adding the detour part to the shape of the orthosis, contact force between the orthosis and auricle can be relaxed. The results of insertion experiment and simulation using urethane rubber plate and six orthoses with different detour distances showed that the larger the distance, the contact force becomes smaller when the detour distance was more than 16 mm. Also finite element analysis result using auricular model showed that the contact force can be controlled by the detour dis tance. As for the evaluated case, the longer the distance, the contact force becomes smaller when the detour distance was more than 8 mm. The detoured type orthoses were applied to the treatment of cryptotia, and treated effectively within a year.

Original languageEnglish
Pages (from-to)321-323
Number of pages3
JournalInternational Journal of Computer Assisted Radiology and Surgery
Volume1
Issue numberSUPPL. 7
DOIs
Publication statusPublished - 2006 Jun

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Keywords

  • Finite element analysis
  • Malformed ears
  • Orthosis
  • Shape memory alloy wire

ASJC Scopus subject areas

  • Surgery
  • Biomedical Engineering
  • Radiology Nuclear Medicine and imaging
  • Computer Vision and Pattern Recognition
  • Health Informatics
  • Computer Science Applications
  • Computer Graphics and Computer-Aided Design

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