Computer assisted orthosis design system for malformed ears - Automatic shape modification method for preventing excessive corrective force

Akihiko Hanafusa, T. Isomura, Y. Sekiguchi, H. Takahashi, T. Dohi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Most malformed ears of neonates can be treated by mounting a suitably shaped orthosis. However, it needs much experience to make a orthosis that produces adequate corrective force. Especially, excessive force may cause a decubitus-like inflammation on the auricle. We are studying computer assisted system to support the orthosis design. And we have already developed fundamental design and manufacturing system. This paper describes automatic orthosis shape modification method to prevent the excessive corrective force using three dimensional finite element method. Incremental method inserting the orthosis in the auricle is used to handle non-linear material property of the auricle. In each insertion step, corrective force of every nodal point of the orthosis is calculated. The shape is modified by canceling the insertion of nodal point where excessive contact force is produced. The auricle and the orthosis were modeled by triangular shell elements and beam elements respectively. Finally the sample result of analysis showed that the orthosis modified by the method can reduce maximum force compared to that of the original shape.

Original languageEnglish
Title of host publicationAnnual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings
EditorsJ.D. Enderle
Pages1976-1978
Number of pages3
Volume3
Publication statusPublished - 2000
Externally publishedYes
Event22nd Annual International Conference of the IEEE Engineering in Medicine and Biology Society - Chicago, IL, United States
Duration: 2000 Jul 232000 Jul 28

Other

Other22nd Annual International Conference of the IEEE Engineering in Medicine and Biology Society
CountryUnited States
CityChicago, IL
Period00/7/2300/7/28

Fingerprint

Mountings
Materials properties
Finite element method

Keywords

  • Automatic modification
  • Computer assisted design
  • Finite element analysis
  • Malformed ears
  • Orthosis

ASJC Scopus subject areas

  • Bioengineering

Cite this

Hanafusa, A., Isomura, T., Sekiguchi, Y., Takahashi, H., & Dohi, T. (2000). Computer assisted orthosis design system for malformed ears - Automatic shape modification method for preventing excessive corrective force. In J. D. Enderle (Ed.), Annual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings (Vol. 3, pp. 1976-1978)

Computer assisted orthosis design system for malformed ears - Automatic shape modification method for preventing excessive corrective force. / Hanafusa, Akihiko; Isomura, T.; Sekiguchi, Y.; Takahashi, H.; Dohi, T.

Annual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings. ed. / J.D. Enderle. Vol. 3 2000. p. 1976-1978.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Hanafusa, A, Isomura, T, Sekiguchi, Y, Takahashi, H & Dohi, T 2000, Computer assisted orthosis design system for malformed ears - Automatic shape modification method for preventing excessive corrective force. in JD Enderle (ed.), Annual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings. vol. 3, pp. 1976-1978, 22nd Annual International Conference of the IEEE Engineering in Medicine and Biology Society, Chicago, IL, United States, 00/7/23.
Hanafusa A, Isomura T, Sekiguchi Y, Takahashi H, Dohi T. Computer assisted orthosis design system for malformed ears - Automatic shape modification method for preventing excessive corrective force. In Enderle JD, editor, Annual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings. Vol. 3. 2000. p. 1976-1978
Hanafusa, Akihiko ; Isomura, T. ; Sekiguchi, Y. ; Takahashi, H. ; Dohi, T. / Computer assisted orthosis design system for malformed ears - Automatic shape modification method for preventing excessive corrective force. Annual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings. editor / J.D. Enderle. Vol. 3 2000. pp. 1976-1978
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