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dc.contributor.authorYu-Liang Laizh_TW
dc.contributor.authorPo-Yin Chengzh_TW
dc.contributor.authorChi-Chuan Yangzh_TW
dc.contributor.authorShiow-Kang Yenzh_TW
dc.description.abstractAlthough the initial success of bare metal stents has significantly reduced the restenosis rate for percutaneous transluminal coronary angioplasty from 35% to 25%, the biological mechanism such as vascular smooth muscle cells (VSMCs) proliferation and neo-intimal hyperplasia still may induce in-stent restenosis (ISR). Therefore, some drug eluting stents have been introduced to reduce ISR. In this study, heparin (Hep) combined with calcium phosphate (CaP) and gelatin (Gel), without any additive or solvent, is co-deposited on hydroxyapatite (HA) coated NiTi alloy in order to enhance the drug load and the sustaining release for promoting the hemo-compatibility of NiTi substrate. Polarization tests were carried out in several solutions to investigate deposition mechanisms. Heparin contained composite coatings were characterized by X-ray diffractometry, Field emission scanning electron microscope, Fourier transform infrared spectroscopy, toluidine blue colorimetric assay, UV–visible spectrometer and kinetic clotting tests. The consequences indicate that heparin accompanied respectively with CaP, and Gel through ionic bonds can be loaded on the NiTi alloy. The porous post-HA coating can dramatically enhance the heparin content from 148 for the single layer coating (CaP-Hep) to 325 μg/cm2 for the tri-layer coating (HA/CaP-Hep/Gel-Hep), also resulting in the heparin release duration from 1 to >35 days, supposed to meet the requirement to prevent the proliferation of VSMCs. Both the drug content and releasing time are remarkable. As the result of clotting tests in vitro, drug loaded composite coatings reveal good anticoagulant property which is proportional to the cumulative content of drug release in an hour, indicating no denaturalization of heparin found during the electrochemical process.zh_TW
dc.relationThin Solid Films, Volume 649, 1 March 2018, Pages 192-201zh_TW
dc.subjectNickel titanium alloyzh_TW
dc.subjectCalcium phosphatezh_TW
dc.subjectDrug controlled releasezh_TW
dc.titleElectrolytic deposition of hydroxyapatite/calcium phosphate-heparin/gelatin-heparin tri-layer composites on NiTi alloy to enhance drug loading and prolong releasing for biomedical applicationszh_TW
dc.typeJournal Articlezh_TW
Appears in Collections:材料科學與工程學系


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