Active bending ileus tube using shape memory alloy for treatment of intestinal obstruction

Yoichi Haga, M. Mizushima, Tadao Matsunaga, Kentaro Totsu, Masayoshi Esashi

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

6 Citations (Scopus)

Abstract

Soft and long silicone rubber tube (Long Intestinal Tube; LIT) is commonly used for conservative treatment in intestinal obstruction (ileus). The LIT is inserted into the intestine for dpressurization by continuous suction from outside the body. In insertion of the tube, it is difficult to pass the lower opening of the stomach (pylorus) because of its narrowness. An LIT that has stainless steel weights at the tip is most widely used for the insertion. This tube utilizes gravity to facilitate manipulation of the tip. However, a patient must endure pain when he or she changes position. For accurate positioning of the tip, active bending LIT using shape memory alloy (SMA) coil micro actuator, which contracts by supplying electrical current has been developed. The tube consists of a bending tip (external diameter, 6 mm; length, 40 mm) and a 3-m-long silicone rubber tube. It enables easier and more reliable passage at the pylorus. The maximum bending angle was 110 degrees and the bending tip is flexible even if it bends because of softness of the SMA micro-coil. The surface temperature of the tip during active bending motion was measured under conditions of 38°C and it takes 45 seconds for the surface temperature to rise over 41°C when the bending angle is maintained at 30 degrees.

Original languageEnglish
Title of host publication2005 3rd IEEE/EMBS Special Topic Conference on Microtechnology in Medicine and Biology
Pages249-252
Number of pages4
DOIs
Publication statusPublished - 2005 Dec 1
Event2005 3rd IEEE/EMBS Special Topic Conference on Microtechnology in Medicine and Biology - Oahu, HI, United States
Duration: 2005 May 122005 May 15

Publication series

Name2005 3rd IEEE/EMBS Special Topic Conference on Microtechnology in Medicine and Biology
Volume2005

Other

Other2005 3rd IEEE/EMBS Special Topic Conference on Microtechnology in Medicine and Biology
CountryUnited States
CityOahu, HI
Period05/5/1205/5/15

Keywords

  • Active catheter
  • Catheter
  • Ileus
  • Rubber
  • SMA actuator
  • Silicone

ASJC Scopus subject areas

  • Engineering(all)

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