Reliability of cobalt–chromium alloy aneurysm clips after long-term implantations in patients with cerebral aneurysms

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Object

Aneurysm clip reliability after long-term implantation in vivo has not been examined. In this study the authors evaluated the mechanical properties and surface elemental composition of Co-Cr alloy aneurysm clips implanted for more than 10 years in patients with cerebral aneurysms.

Methods

Five aneurysm clips implanted for ruptured or unruptured intracranial aneurysms were retrieved and examined. New aneurysm clips were applied to the regrown aneurysms. The implantation period ranged from 11 to 20 years. Four new and unused aneurysm clips were also examined as controls. The mechanical properties of the clips were tested by measuring their closing force and bending strength. The surface elemental composition of the aneurysm clips was evaluated using x-ray photoelectron spectroscopy. The closing force of the retrieved clips exceeded the minimum force requirement at the time of manufacture. The bending strength was similar between the retrieved and control clips. Chromium oxide was the predominant constituent on the surface of all clips, and its concentration on the retrieved clips was higher than that on the control clips.

Conclusions

Data in the present study demonstrated that Co-Cr alloy aneurysm clips retain their mechanical properties in vivo for a long time, which indicates the reliability of these clips.

Abbreviations used in this paper:ACoA = anterior communicating artery; ASTM = American Society for Testing and Materials; BA = basilar artery; XRP = x-ray photoelectron.
Article Information

Contributor Notes

Address reprint requests 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.

© AANS, except where prohibited by US copyright law.

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