Mechanical characteristics and surface elemental composition of a Yasargil titanium aneurysm clip after long-term implantation

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The mechanical properties of titanium-alloy aneurysm clips after long-term implantation in the human cranium are unclear. The characteristics of a Yasargil titanium aneurysm clip were evaluated after long-term implantation for 12 years in a patient with a cerebral aneurysm. The closing forces of the retrieved clip before and after implantation were approximately equal. The bending test showed no differences between the retrieved and control clips. Titanium oxide and calcium were identified on the surface of the retrieved clip, which indicated the formation of corrosion-resistant layers. Titanium-alloy clips retain their mechanical properties in the human cranium for a long time.

Abbreviation used in this paper: XPS = x-ray photoelectron spectroscopy.
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Contributor Notes

Address correspondence to: Yasunari Otawara, M.D., Department of Neurosurgery, Iwate Medical University, 19-1 Uchimaru, Morioka, Iwate, 020-8505 Japan. email: ootawara-nsu@umin.ac.jp.Please include this information when citing this paper: published online October 9, 2009; DOI: 10.3171/2009.9.JNS09827.

© AANS, except where prohibited by US copyright law.

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