Evaluation of blood compatibility of plasma deposited heparin-like films and SF6 plasma treated surfaces
In devices used in open-heart surgery and dialysis, blood must be continuously processed using extracorporeal circuits composed of peristaltic pumps and active components such as specifc flters and oxygenators. Several procedures have been employed to avoid blood coagulation induced by contact with...
| Authors: | , , , , |
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| Format: | article |
| Status: | Published version |
| Publication Date: | 2010 |
| Country: | Brasil |
| Institution: | Universidade Estadual Paulista (UNESP) |
| Repository: | Repositório Institucional da UNESP |
| Language: | English |
| OAI Identifier: | oai:repositorio.unesp.br:11449/71530 |
| Online Access: | http://dx.doi.org/10.1590/S1516-14392010000100019 http://hdl.handle.net/11449/71530 |
| Access Level: | Open access |
| Keyword: | Biomaterials Blood compatibility Heparin PECVD Plasma treatment Active components Bioactive proteins Blood coagulation Clot formation Coagulation time Gas plasma Glass substrates Glass surfaces Human bloods Open-heart surgery Peristaltic pump Radio-frequency plasma enhanced chemical vapor deposition Surface energy measurements Biological materials Blood substitutes Coagulation Contact angle Dialysis Glass Infrared spectroscopy Oxygenators Plasma deposition Plasma enhanced chemical vapor deposition Plasmas Polysaccharides Polyvinyl chlorides Substrates Surface chemistry Surface tension Blood |
| Summary: | In devices used in open-heart surgery and dialysis, blood must be continuously processed using extracorporeal circuits composed of peristaltic pumps and active components such as specifc flters and oxygenators. Several procedures have been employed to avoid blood coagulation induced by contact with the artifcial surfaces of such devices. Often heparin, a bioactive protein able to prevent clot formation, is employed. In this work, we have used heparin-containing gas plasmas to evaluate the possibility of depositing adherent anticoagulant flms onto PVC and glass surfaces. The flms were produced by radiofrequency plasma enhanced chemical vapor deposition from heparin/isopropanol and heparin/hexamethyldisiloxane solutions. In addition, the effects of exposure to SF6 plasmas on the compatibility of such surfaces have also been investigated. The blood compatibility was evaluated through the determination of the density of platelets and fbrinogen and activated partial thromboplastin (APTT) and prothrombin times (PT) of human blood freshly collected and after contact for 2.5 hours with different surfaces. The deposited flms were also characterized by infrared spectroscopy, contact angle and surface energy measurements. The coagulation time of blood, placed in contact with glass substrates coated by PECVD flms of heparin/isopropanol mixtures, and in contact with SF6 plasma-treated PVC, increased by about 60 and 20%, respectively, compared to the values measured with untreated samples. |
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