Evaluation of Antithrombogenic pHPC on CoCr Substrates for Biomedical Applications

Bare metal endovascular implants pose a significant risk of causing thrombogenic complications. Antithrombogenic surface modifications, such as phenox’s “Hydrophilic Polymer Coating” (pHPC), which was originally developed for NiTi implants, decrease the thrombogenicity of metal surfaces. In this stu...

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Bibliographic Details
Published in:Coatings (Basel) 2021-01, Vol.11 (1), p.93
Main Authors: Bannewitz, Catrin, Lenz-Habijan, Tim, Lentz, Jonathan, Peters, Marcus, Trösken, Volker, Siebert, Sabine, Weber, Sebastian, Theisen, Werner, Henkes, Hans, Monstadt, Hermann
Format: Article
Language:English
Subjects:
Adhesion tests
Alloys
Aneurysms
Atomic force microscopy
Biomedical materials
Blood clots
Blood platelets
Braiding
Coating effects
Contact angle
Design
Efficiency
Fluorescence
Intermetallic compounds
Lasers
Mechanical properties
Metal surfaces
Microscopy
Nickel titanides
Platelets
Plates
Polymer coatings
Polymers
Shape memory alloys
Stents
Substrates
Surface roughness
Surgical implants
Transplants & implants
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Summary:Bare metal endovascular implants pose a significant risk of causing thrombogenic complications. Antithrombogenic surface modifications, such as phenox’s “Hydrophilic Polymer Coating” (pHPC), which was originally developed for NiTi implants, decrease the thrombogenicity of metal surfaces. In this study, the transferability of pHPC onto biomedical CoCr-based alloys is examined. Coated surfaces were characterized via contact-angle measurement and atomic force microscopy. The equivalence of the antithrombogenic effect in contact with whole human blood was demonstrated in vitro for CoCr plates compared to NiTi plates on a platform shaker and for braided devices in a Chandler loop. Platelet adhesion was assessed via scanning electron microscopy and fluorescence microscopy. The coating efficiency of pHPC on CoCr plates was confirmed by a reduction of the contact angle from 84.4° ± 5.1° to 36.2° ± 5.2°. The surface roughness was not affected by the application of pHPC. Platelet adhesion was significantly reduced on pHPC-coated specimens. The platelet covered area was reduced by 85% for coated CoCr plates compared to uncoated samples. Uncoated braided devices were completely covered by platelets, while on the pHPC-coated samples, very few platelets were visible. In conclusion, the antithrombogenic effect of pHPC coating can be successfully applied on CoCr plates as well as stent-like CoCr braids.
ISSN:2079-6412
2079-6412
DOI:10.3390/coatings11010093