Development and in vivo testing of a Nitinol tracheal stent

This article describes the development of a Nitinol tracheal stent (HCPA NiTi‐stent) and its application in a feline animal model. Straight‐annealed, bright‐polished Nitinol wire (55.8%Ni‐44.2%Ti) was weaved around a 40‐mm‐long metal fixture with 8‐mm diameter. The prototypes were submitted to diffe...

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Bibliographic Details
Published in:	Journal of biomedical materials research. Part B, Applied biomaterials Vol. 83B; no. 1; pp. 216 - 221
Main Authors:	Vearick, Samanta B., Michelon, Marcelo D. O., Schaeffer, Lirio, Xavier, Rogério G., Kuhl, Gabriel, Sanches, Paulo R. S., Duarte, Marcos E. S.
Format:	Journal Article
Language:	English
Published:	Hoboken Wiley Subscription Services, Inc., A Wiley Company 01-10-2007
Subjects:	Alloys - chemistry animal model Animals biocompatibility Cats Humans materials testing Nitinol Prosthesis Design Stents Stress, Mechanical trachea Trachea - anatomy & histology Trachea - surgery
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Summary:	This article describes the development of a Nitinol tracheal stent (HCPA NiTi‐stent) and its application in a feline animal model. Straight‐annealed, bright‐polished Nitinol wire (55.8%Ni‐44.2%Ti) was weaved around a 40‐mm‐long metal fixture with 8‐mm diameter. The prototypes were submitted to different times of shape‐setting heat treatment (530°C), which resulted in stents of different colors and caused some variation in length and diameter. The prototypes were then submitted to compression testing, and the most resistant pieces, requiring the greatest force to achieve a 25% reduction in diameter and presenting the least variation in length and diameter (dark blue, 9 min of heat treatment), were submitted to fatigue testing. After that, only dark blue stents were manufactured and implanted in felines. No migration, tracheal stenosis, or any other type of damage were observed after 40 weeks. The integrity of the tracheal wall in contact with the stent was confirmed by macro and microscopic analyses. The development and in vivo testing of the HCPA NiTi‐stent were successful. © 2007 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater 2007
Bibliography:	istex:AE0C78A3CFDD6777146378378503478CE0B74F75 ark:/67375/WNG-X1LLXQZR-7 ArticleID:JBM30786 FINEP (Brazil) FIPE (Hospital de Clínicas de Porto Alegre) - No. 02.452 ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 ObjectType-Article-1 ObjectType-Feature-2
ISSN:	1552-4973 1552-4981
DOI:	10.1002/jbm.b.30786