Novel Guglielmi detachable coils (GDCs) for the treatment of brain aneurysms. In vitro study of hydroxyapatite coating on Pt plate as GDCs model.

With the use of an alternate soaking process a thin layer of hydroxyapatite (HAp) was formed on a platinum plate (Pt plate) which was used as a model for Guglielmi detachable coils (GDCs). The in vitro coagulant activity of the HAp-coated Pt plate was evaluated for the purpose of brain aneurysm treatment. In order to fix and to form the apatite layer homogeneously, beta-mercaptopropionic acid was immobilized onto the Pt surface prior to use. The HAp layer was formed on the beta-mercaptopropionic acid-fixed Pt plate surface, and quantitative control of apatite formation was achieved by controlling the number of alternate soaking process cycles. The HAp formed on the Pt plate surface was confirmed by X-ray diffraction and X-ray photoelectron spectroscopy studies. Blood interaction with the Pt plate was altered from nonthrombotic to highly thrombotic by forming a HAp layer on the surface. The alternate soaking process is an appropriate method to modify the GDCs. Complete treatment of brain aneurysms is expected with the use of HAp-coated GDCs, which would allow formation of a stable blood clot. Copyright 2003 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater 66B: 429-438, 2003