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Mzyk A.,Polish Academy of Sciences | Major R.,Polish Academy of Sciences | Lackner J.M.,Joanneum Research | Bruckert F.,Grenoble Institute of Technology | And 2 more authors.
RSC Advances | Year: 2015

The multilayer polyelectrolyte films (PEMs) seem to be promising coatings to simulate the structure and behavior of the extracellular matrix. PEMs constructed through Layer by Layer deposition of oppositely charged polymers have become a powerful tool for tailoring biointerfaces. Films consisting of chitosan/chondroitin sulfate polymers exhibit a fast biodegradability in the environment of human tissues. Lifetime extension of this material type could be implemented by its structure stabilization through cross-linking or introduction of nanoparticles. Transmission electron microscopy (TEM) and high resolution transmission electron microscopy (HRTEM) methods were used to determine the microstructure and localization of the silicon carbide nanoparticles introduced to the extracellular like structure of the polymer coatings. The numerical analysis of nanoparticles dispersion and mechanical properties was verified by indentation measurements. Modified coatings biocompatibility was analyzed by cytotoxicity assays and microscopic observations of the growth of endothelial cells on the material surface. Comparison of stabilization methods including chemical cross-linking and SiC nanoparticles introduction into multilayer polyelectrolyte films has shown that both stabilizers could be useful for biomedical applications. However, SiC nanoparticles application could be limited by slightly lower endothelialization efficiency and risk of cytotoxicity due to their release from coatings. This journal is © The Royal Society of Chemistry 2015. Source

Mzyk A.,Polish Academy of Sciences | Major R.,Polish Academy of Sciences | Kot M.,AGH University of Science and Technology | Gostek J.,Polish Academy of Sciences | And 2 more authors.
Archives of Civil and Mechanical Engineering | Year: 2014

The aim of this study was to improve properties of blood contacting materials such as polyurethane, in a form of intelligent, self-organizing and self-controlling coatings, which allow the selective mobilization and colonization of the endothelial cells on their surface. The prepared multilayer polyelectrolyte scaffolds were cross-linked chemically by EDC/NHS reagents in order to control their physicochemical properties and thus improving potential to endothelialization. Four types of coatings, i.e. non-cross-linked, cross-linked by 260. mM, 400. mM and 800. mM EDC reagent, were investigated. Their comparison was performed based on the results of the surface topography measurements using Atomic Force Microscopy (AFM), cellular morphology and proliferation analysis using Confocal Laser Scanning Microscopy (CLSM) and the mechanical properties examinations.The optimal multilayer rigidity and surface roughness parameters were found for an effective control of the endothelial cells growth. Surface topography analysis indicated an increase in the coating's roughness due to application of higher EDC cross-linker concentrations. Mechanical studies revealed that cross-linking caused a significant increase in the hardness and elastic modulus. The results from the cellular experiments allowed the conformation that 400. mM cross-linked PLL/HA films possess desired properties. © 2013 Politechnika Wroclawska. Source

Nawrat Z.,Foundation for Cardiac Surgery Development
Bulletin of the Polish Academy of Sciences: Technical Sciences | Year: 2010

The paper presents the current state of works conducted by the Zabrze team under the Robin Heart surgical robot and the Robin Heart Uni System mechatronic surgical tools project as a example of introducing technology and materials advances for progress in surgical robots. The special intention of the author is to show the review of the current and futuristic medical robots needs in the area of material science. Source

Wilczek P.,Foundation for Cardiac Surgery Development
Bulletin of the Polish Academy of Sciences: Technical Sciences | Year: 2010

Tissue engineering is a promising tool for the creation of a new type of the heart valve bioprothesis. The biological scaffold composed of decellularized tissue has been successfully used for the constructions of the valve prosthesis. An analysis of the efficiency of the valve leaflet acellularization methods and the influence of those methods on the morphology and the biomechanical properties of the ECM (extra cellular matrix) was performed. Fresh porcine hearts obtained from a slaughterhouse were used in the experiments. The efficiency of the acellularization methods was dependent on the tissue type and the acellularoization methods used. The more effective were the enzymatic methods, both because of the cell removal efficiency and the effect on the biomechanical properties of the heart valve. The differences in the biomechanical and morphological properties of the porcine aortic and the pulmonary valve after different types of the acellularization process could influence the hemodynamic conditions of the heart after the valve replacement, which limited the range of the tissue types used for the creations of the tissue engineered heart valve. Source

Major R.,Polish Academy of Sciences | Lackner J.M.,Joanneum Research | Gorka K.,Foundation for Cardiac Surgery Development | Wilczek P.,Foundation for Cardiac Surgery Development | Major B.,Polish Academy of Sciences
RSC Advances | Year: 2013

The objective of this work was to modify the inner surfaces of polymer tubes to improve their biocompatibility with blood cells. New materials that were designed to be placed in contact with blood during forced blood circulation were studied. The inner surfaces of these tubes were covered with anti-thrombogenic coatings. Materials based on silicon carbide, silicon oxide, and silicon nitride were deposited. Depending on the topography and the chemical nature of the inner vessel surface, a non-thrombogenic bio-surface, also called a neointima, was formed. Several expected applications of this work are discussed, including archetypal human blood vessels, the design of a nanostructural artificial substitute, optimising the surface using vacuum-coating techniques, characterising materials on multiple scales, and studying the blood-material interaction under dynamic conditions in an arterial flow environment. Several promising solutions for inhibiting the activation of the blood-clotting cascade via the use of appropriate surface architectures have been obtained. These solutions may be applied in advanced biocompatible cardiovascular implants. © 2013 The Royal Society of Chemistry. Source

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