Shape Memory Alloy Artificial Muscles for Treatments of Fecal Incontinence

Yun Luo, Toshiyuki Takagi, Shintaro Amae, Motoshi Wada, Tomoyuki Yambe, Takamichi Kamiyama, Kotaro Nishi, Takeshi Okuyama, Toshihiko Komoriya, Hidetoshi Matsuki

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Shape memory alloys (SMAs) have the features of large force-to-weight ratio and large deformation, are considered suitable for actuator uses. This paper describes the applications of an SMA material with two-way shape memory as artificial muscles for the treatment of fecal incontinences. Two designs of the proposed artificial sphincters are presented; one for a complete replacement of the anal sphincter and the other as an auxiliary sphincter to assist the puborectal muscles for maintaining fecal continence. Their functional evaluations have been conducted through fundamental experiments on the thermal responses and the mechanical deformation. The functionality of both was confirmed by in vitro experiments. The first design, the artificial anal sphincter was subjected to animal experiments for up to 4 weeks. Satisfactory results in respects of the biofunctionality of the SMA artificial sphincter imply its potential for practical uses.

Original languageEnglish
Pages (from-to)272-276
Number of pages5
JournalMaterials Transactions
Issue number2
Publication statusPublished - 2004 Feb


  • Artificial muscles
  • Fecal incontinence
  • Puborectal muscles
  • Shape memory alloys (SMAs)
  • Sphincter

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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