Studies of reaction of gelatin-alginate matrixes on morphotic elements and blood proteins

W pracy przedstawiono ocenę działania hemolitycznego i hemostatycznego matryc żelatynowo-alginianowych oraz matryc sieciowanych mleczanem wapnia po czasowym kontakcie z krwią w badaniach in vitro. Na podstawie uzyskanych wyników badań stwierdzono, że matryce nie wywołują istotnych zmian w wartościach odsetka hemolizy i stężenie hemoglobiny osoczowej. Powodują aktywację układu krzepnięcia, skrócenie czasu rekalcynacji krwi i wydłużenie APTT. Wartości pomiarowe mieszczą się w zakresie wartości referencyjnych oznaczonych parametrów.The paper presents an evaluation of hemolytic and hemostatic activity of gelatin-alginate matrixes and cross-linking of the matrix with calcium ions after contact with human blood in vitro studies. In view of the results in has been reported that a matrix does not cause important quantitative changes in the percentage of hemolysis and free hemoglobin concentration. In the plasma coagulation system evaluation blood recalcyfication time was shortened and activated partial thromboplastin time (APTT) was prolonged. That suggested that coagulation processes were activated

Effect of pyrolytic carbon on the morphological parameters of blood

W pracy przedstawiono analizę ilościową wybranych parametrów morfologicznych krwi po jej czasowym kontakcie z materiałem węglowym LTI. Na podstawie uzyskanych wyników nie stwierdzono zmian w wartościach parametrów układu czerwonokrwinkowego, natomiast zaobserwowano zmiany w wartościach parametrów układu białokrwinkowego i płytkowego. Zaobserwowane zmiany w wartościach parametrów morfologicznych nie przekraczają zakresu wartości referencyjnych dla tych wskaźników.A quantitative analysis of selected morphological parameters of blood after its temporal contact with LTI carbon material was presented in the study. The obtained results indicate that the values of parameters of erythrocyte system did not change, while the values of parameters of leukocyte and platelet systems were altered. The changes in the values of parameters did not exceed the range of referential values for these indexes

The evaluation of resorbable haemostatic wound dressings in contact with blood in vitro

Purpose: For many years research has been conducted on the development of resorbable, polymer, haemostatic materials designed to provide first aid and preliminary protection of injuries. The biological properties in vitro of a dressing in powder form called Hemoguard are expected to provide the ability to instantaneously stem bleeding with safe conditions of use. The aim of the study was to evaluate the haemostatic properties of a model of dressing based on micro- and nanofibrids of the chitosan, sodium/calcium alginate and/or carboxymethylcellulose complex. Dressings were prepared by spray-drying and freeze-drying. Methods: Human whole blood was subjected to timed contact with the haemostatic dressing model. Haemolytic action was determined by assaying the degree of haemolysis and evaluating blood cell morphology. Haemostatic action was determined on the basis of selected parameters of plasmatic clotting systems. Results: Dressings prepared by freeze-drying activated the coagulation system. The haemolytic index, plasma haemoglobin concentration values and blood cell morphological shapes were normal. Dressings prepared by spray-drying significantly activated coagulation. Activation of the coagulation process was evidenced by shorter clotting time of the plasma coagulation system and a longer process of clot formation. The dressing was associated with an increased haemolytic index and higher plasma haemoglobin concentration. The morphological shape of blood cells changed. Conclusions: The model of multi-resorbable wound dressings has haemostatic properties. The materials activate the clotting process more quickly than a single-dressing model. Increased activity was found for dressings prepared by spray-drying

On influence of anodic oxidation on thrombogenicity and bioactivity of the Ti-13Nb- 13Zr alloy

Purpose: This paper reports the results of investigations of the blood response of the modified titanium alloys surfaces. Methods: To enhance biocompatibility of the Ti-13Nb-13Zr alloy, anodisation was performed at 80 and 150 V. The oxidation process was carried out in a solution containing 4 mol dm−3 H3PO4 and 0.59 mol dm−3 Ca(H2PO2)2. Results: The haemolytic activity of the titanium alloy surface was not altered much by the anodisation. The obtained values of the percentage of haemolysis were well below the levels required for the materials intended for blood contact. The clotting time of the blood was similar for the as-ground sample and the sample anodised at 80 V. For the sample anodised at 150 V the clotting time was shorter. The differences between these samples were observed in partial thromboplastin time after activation, prothrombin time and thrombin time, after 24 h. Extracts taken from the samples were not toxic towards the L-929 mouse fibroblast cells. Conclusions: The proposed treatment might be appropriate for the preparation of the modified Ti-13Nb-13Zr surfaces intended for bone reconstruction or cardiovascular implants depending on process parameters

Haemocompatibility and cytotoxic studies of non-metallic composite materials modified with magnetic nano and microparticles

Purpose: Preventing the formation of blood clots on the surface of biomaterials and investigation of the reasons of their formation are the leading topics of the research and development of biomaterials for implants placed into the bloodstream. Biocompatibility and stability of a material in body fluids and direct effect on blood cell counts components are related both to the structure and physico-chemical state of an implant surface. The aim of this study was to determine haemocompatibility and cytotoxicity of polysulfone-based samples containing nano and micro particles of magnetite (Fe3O4). Methods: The polysulfone-based samples modified with nanometric and micrometric magnetite particles were examined. Physicochemical properties of the composites were determined by testing their wettability and surface roughness. The action of haemolytic, activation of coagulation system and cytotoxicity of composites was evaluated. Results: Wettability and roughness of materials were correlated with nanoparticles and microparticles content. In the tests of plasma coagulation system shortening of activated partial thromboplastin time for polysulfone with nano magnetite and with micro magnetite particles was observed in comparison with pure polysulfone. Prothrombine time and thrombine time values as well as fibrinogen concentration were unchanged. Haemolysis values were normal. Morphology and viability of cells were normal. Conclusions: Composites made from polysulfone modified with nanoparticles and microparticles of magnetite cause neither haemolytic nor cytotoxic reaction. These composites evoke plasma endogenous system activation