title: Mechanical characteristics and surface elemental composition of a Yasargil titanium aneurysm clip after long-term implantation.
abstract: 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.
authors.affiliation: Department of Neurosurgery, Iwate Medical University, Morioka, Japan.
authors.forename: Yasunari
authors.initials: Y
authors.lastname: Otawara
authors.forename: Kuniaki
authors.initials: K
authors.lastname: Ogasawara
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Kashimura
authors.forename: Yoshitaka
authors.initials: Y
authors.lastname: Kubo
authors.forename: Akira
authors.initials: A
authors.lastname: Ogawa
authors.forename: Kouichi
authors.initials: K
authors.lastname: Watanabe
mesh_terms: D000368:Aged; D000497:Alloys; D001696:Biomechanical Phenomena; D019544:Equipment Failure Analysis; D005500:Follow-Up Studies; D006801:Humans; D007223:Infant; D002532:Intracranial Aneurysm / Q000601:surgery*; D056951:Photoelectron Spectroscopy; D019736:Prostheses and Implants; D013499:Surface Properties; D013525:Surgical Instruments; D014025:Titanium
chemical_list: D000497:Alloys; C031462:titanium alloy (TiAl6V4); D014025:Titanium