Effects of a Titanium Dioxide Thin Film for Improving the Biocompatibility of Diamond-Like Coated Coronary Stents
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This study was performed to evaluate the effects of a diamond-like carbon (DLC) layer on the biological properties of a pre-treated titanium dioxide (TiO2) coronary stent surface. TiO2 and DLC were coated onto a cobalt-chromium stent surface in consecutive order using the plasma-enhanced chemical vapor deposition method (TiO2/DLC). To investigate the effect of TiO2, a group treated only with DLC was also prepared as a control. The surface characteristics were investigated by SEM, ESCA, AFM, and contact angle analyses. To estimate the effect of surface modification on biological response, endothelial cell migration was carried out. As a result, cracking of the coating layer on the strut curved portion in the DLC group was restored in the TiO2/DLC group. ESCA result showed that the peaks sp2 and sp3 were slightly shifted and higher in the TiO2/DLC group. The surface roughness average was highly increased in the TiO2/DLC group (Ra; 18.033) compared to the BMS (Ra; 9.258) and DLC groups (Ra; 10.144). By the increment of Ra, the surface property became hydrophilic in the TiO2/DLC group (39.8° ± 5.88°) compared to the non-treated (72.7° ± 2.24°) and DLC (78.6° ± 2.24°) groups. Endothelial cell migration was significantly increased in the TiO2/DLC group (68.9 ± 13.52%) compared to the non-treated (5.4 ± 3.14%) and DLC groups (22.3 ± 8.22%). Therefore, the improvement of surface properties and endothelial cell migration in the TiO2/DLC group could improve the physiological response in the human body.
KeywordsCoronary stent Diamond-like carbon Titanium dioxide Surface modification Endothelialization
This study was supported by a Grant from the Korean Health Technology R&D Project (HI13C1527) and the Korea Health Industry Development Institute (KHIDI) (HI17C0471), funded by the Ministry of Health and Welfare, Republic of Korea.
Compliance with Ethical Standards
Conflict of interest
The authors declare that they have no conflict of interest.
- 6.T. Hanawa, Adv. Powder. Technol. 3, 289 (2002)Google Scholar