Failure analysis of explanted sternal wires

Chun Ming Shih, Yea Yang Su, Shing Jong Lin, Chun Che Shih

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

To classify and understand the mechanisms of surface damages and fracture mechanisms of sternal wires, explanted stainless steel sternal wires were collected from patients with sternal dehiscence following open-heart surgery. Surface alterations and fractured ends of sternal wires were examined and analyzed. Eighty fractured wires extracted from 25 patients from January 1999 to December 2003, with mean implantation interval of 55±149 days (range 5-729 days) after cardiac surgery, were studied by various techniques. The extracted wires were cleaned and the fibrotic tissues were removed. Irregularities and fractured ends were assayed by a scanning electron microscopy. After stereomicroscopy and documentation, the explants were cleaned with 1% sodium hypochlorite to remove the blood and tissues and was followed by cleaned with deionized water and alcohol. The explants were examined by stereomicroscopy, and irregularities on surface and fracture surfaces of sternal wires were assayed by scanning electron microscopy, energy dispersive X-ray analysis (EDAX) and X-ray mapping. The explants with surrounding fibrotic tissue were stained and examined with stereomicroscopy and transmission electronic microscopy. Corrosion pits were found on the surface of explanted sternal wires. EDAX and X-ray mapping examinations revealed diminution of nickel concentration in the severely corroded pits on sternal wires. A feature of transgranular cracking was observed for stress corrosion cracking and striation character for typical corrosion fatigue was also identified. TEM examination of tissue showed the metallic particles in phagolysosomes of macrophages inside the surrounding sternal tissue. The synergic effect of hostile environment and the stress could be the precursors of failures for sternal wires.

Original languageEnglish
Pages (from-to)2053-2059
Number of pages7
JournalBiomaterials
Volume26
Issue number14
DOIs
Publication statusPublished - May 2005

Fingerprint

Failure analysis
Wire
Corrosion
X-Rays
Tissue
Electron Scanning Microscopy
Thoracic Surgery
Sodium Hypochlorite
Phagosomes
Stainless Steel
Surgery
Nickel
Energy dispersive spectroscopy
Documentation
Fatigue
Microscopy
Macrophages
Alcohols
X rays
Scanning electron microscopy

Keywords

  • Corrosion fatigue
  • Stainless steel sternal wires
  • Sternal dehiscence

ASJC Scopus subject areas

  • Biotechnology
  • Bioengineering
  • Biomedical Engineering

Cite this

Failure analysis of explanted sternal wires. / Shih, Chun Ming; Su, Yea Yang; Lin, Shing Jong; Shih, Chun Che.

In: Biomaterials, Vol. 26, No. 14, 05.2005, p. 2053-2059.

Research output: Contribution to journalArticle

Shih, Chun Ming ; Su, Yea Yang ; Lin, Shing Jong ; Shih, Chun Che. / Failure analysis of explanted sternal wires. In: Biomaterials. 2005 ; Vol. 26, No. 14. pp. 2053-2059.
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