图像分析方法研究DLC膜/Ti6Al4V梯度材料的血液相容性稳定性

对 DL C膜 / Ti6Al4V梯度材料和 Ti6Al4V钛合金进行了血液相容性稳定性研究。用数字图像分析方法分别测定了材料生物摩擦磨损实验前后的血小板消耗率。研究表明 ,在 Hank' s溶液润滑条件下 ,经过 2 0 0 0 m摩擦磨损实验后 ,Ti6Al4V钛合金血小板消耗率显著增加约 5 0 % ,而 DL C膜 / Ti6Al4V梯度材料血小板消耗率没有明显增加。说明 DL C膜 / Ti6Al4V梯度材料在使用条件下具有很好的血液相容性稳定性     

治疗尿毒症新型血液灌流吸附剂体外实验研究

目的:研制用于治疗尿毒症的新型血液灌流吸附剂,通过与已上市血液灌流产品对照研究探讨其对肌酐、尿酸和β2微球蛋白的清除效果及血液相容性。方法:通过体外血浆吸附实验研究血液灌流吸附剂对肌酐、尿酸和β2微球蛋白的清除效率,通过血浆蛋白吸附性、电解质吸附性、血细胞吸附性、溶血性以及凝血性实验评价血液灌流吸附剂的血液相容性。结果:新型HB-H-10血液灌流吸附剂对肌酐、尿酸和β2微球蛋白的吸附率分别达（40.5±2.3）%、（24.2±1.8）%和（46.9±1.3）%,与其他吸附剂相比,吸附效果具有统计学意义（P<0.05）;该吸附剂对血浆蛋白总蛋白、白蛋白、球蛋白、白细胞、红细胞和血小板吸附率分别为（5.69±0.32）%、（4.76±0.42）%、（7.33±0.33）%、（2.88±0.32）%、（9.22±0.26）%和（11.98±0.43）%,与其他吸附剂相比,吸附效果具有统计学意义（P<0.05）;该吸附剂对血浆电解质、溶血率、凝血影响无统计学意义（均P>0.05）,具有优异的血液相容性。结论:研制的新型HB-H-10吸附剂可作为血液灌流吸附剂治疗尿毒症,达到该产品更新换代和升级的效果。     

钽、铌、钛的表面特性与生物相容性

目的：筛选心血管支架材料。方法：考察Ta、Nb、Ti的表面特性、血液相容性和内皮化能力。结果：Ta表面平整,Nb、Ti表面较为粗糙;三者均表现出弱的疏水性和良好的耐蚀性。三种试样的溶血率均低于5％,Ta表面粘附的血小板较少。内皮细胞培养3天时,Ta表面的细胞增殖活性较好,而Nb表面的细胞生长较差。结论：Ta是一种良好的心血管支架材料。     

Glutathione conjugated polyethylenimine on the surface of Fe3O4 magnetic nanoparticles as a theranostic agent for targeted and controlled curcumin delivery

Theranostics with the ability to simultaneous monitoring of treatment progress and controlled delivery of therapeutic agents has become as an emerging therapeutic paradigm in cancer therapy. In this study, we have developed a novel surface functionalized iron oxide nanoparticle using polyethyleneimine and glutathione for targeted curcumin (CUR) delivery and acceptable pH sensitive character. The developed magnetic nanoparticles (MNPs) were physicochemically characterized by FT-IR, XRD, FE-SEM and TEM. The MNPs was obtained in spherical shape with diameter of 50 nm. CUR was efficiently loaded into the MNPs and then in vitro release analyses were evaluated and showed that the prepared MNPs could release higher amount of CUR in acidic medium compared to neutral medium due to the pH sensitive property of the coated polymer. MTT assay confirmed the superior toxicity of CUR loaded MNPs compared to the control nanoparticles. Higher cellular uptake of the MNPs than negative control cells was demonstrated in SK-N-MC cell line. In vitro assessment of MRI properties showed that synthesized MNPs could be used as MRI imaging agent. Furthermore, according to hemolysis assay, the developed formulation exhibited suitable hemocompatibility. In vivo blood circulation analysis of the MNPs also exhibited enhanced serum bioavailability up to 2.5 fold for CUR loaded MNPs compared with free CUR.     

血液对新型人工心瓣膜作用的基础理论研究

目的探索血液对人工心瓣膜作用的基础理论。方法①比较新型心瓣膜材料氧化钛(Ti-o)与现今临床试用的热解碳(LITC)理化特性;②体外血小板(PL)粘附试验;③放射性I125检测Ti-o与LITC表面纤维蛋白原(FIG)的吸附量;④乳酸脱氢酶(LDH)检测PL的吸附量;⑤动物犬股动脉内埋置,6个月后扫描电镜(SEM)比较吸附PL的形态和吸附量。结果 Ti-o属N型半导体,界面能近似FIG。体内、外对FIG与PL的吸附量明显小于LITC。SEM见PL变形及被吸附的量均小于LITC。结论心瓣膜置入后第一反应是血浆蛋白优先于PL被吸附,吸附的种类和数量决定于瓣膜的结构与成分,带负电荷的FIG与瓣膜间若存在较大的界面张力,又具有电子强交流,将FIG失去立体构象的稳定,FIGγ肽链C端上的PL结合位点被暴露,PL与FIG联结便发生凝血,与PL活性有关的膜糖蛋白GPⅡb/Ⅲa也取于瓣膜粘附的蛋白。     

两种下腔静脉滤器的体内血液相容性评价

目的在动物体内评价一种新的下腔静脉滤器（X滤器）和Cordis下腔静脉滤器（C滤器）的血液相容性。方法实验动物为8头猪,雄性,体质量（30±5）kg。将X和C两种滤器置入动物的下腔静脉（肾静脉开口下缘）,在不给动物服用抗凝药物的情况下观察14d,然后取出滤器观察血栓形成情况,对其输送系统进行电镜观察,并在置入滤器前和取出滤器前分别对动物进行造影观察和白细胞、血小板的检测。结果两种滤器对白细胞和血小板都没有明显影响,X滤器和C滤器置入前和取出前白细胞平均值的变化分别是（0．575±4．333）×10^9／L、（3．375±9．411）×10^9／L,P〉0．05;血小板平均值变化分别是（-0．500±57．190）×10^9／L、（-33．000±57．860）×10^9／L。电镜观察显示两种滤器的输送系统都无血栓形成,但是造影显示X滤器血流有不同程度受阻,而C滤器血流受阻不明显;X滤器内有大量血栓形成,而C滤器内没有。结论C滤器的血液相容性好于X滤器。     

抗凝血生物材料的血液相容性

背景：专家们认为改善抗凝血生物材料的血液相容性,可以明显提高抗凝血生物材料的抗凝血性能。 目的：评价聚酯类和钛类抗凝血生物材料的血液相容性。 方法：以文献检索的方法探讨聚酯类和钛类抗凝血生物材料对血液中红细胞、血小板、白蛋白、纤维蛋白以及凝血因子等的影响,并通过溶血试验、动态凝血试验、血小板黏附试验、血清蛋白吸附试验、复钙试验以及乳酸脱氢酶释放试验等分析聚酯类和钛类抗凝血生物材料的抗凝血性能,从而评估聚酯类和钛类抗凝血生物材料的血液相容性。 结果与结论：聚酯类抗凝血生物材料及钛类抗凝血生物材料的溶血率明显降低,血小板黏附较少,白蛋白的吸附量增加,纤维蛋白原的吸附明显减少,复钙时间及凝血时间明显延长,表现出较高的抗凝血性能,具有良好的血液相容性,是较为理想的抗凝血生物材料。     

Influence of Layer-by-Layer Polyelectrolyte Deposition and EDC/NHS Activated Heparin Immobilization onto Silk Fibroin Fabric

To enhance the hemocompatibility of silk fibroin fabric as biomedical material, polyelectrolytes architectures have been assembled through the layer-by-layer (LbL) technique on silk fibroin fabric (SFF). In particular, 1.5 and 2.5 bilayer of oppositely charged polyelectrolytes were assembled onto SFF using poly(allylamine hydrochloride) (PAH) as polycationic polymer and poly(acrylic acid) (PAA) as polyanionic polymer with PAH topmost. Low molecular weight heparin (LMWH) activated with 1-ethyl-3-(dimethylaminopropyl) carbodiimide hydrochloride (EDC) and N-hydroxysuccinimide (NHS) was then immobilized on its surface. Alcian Blue staining, toluidine blue assay and X-ray photoelectron spectroscopy (XPS) confirmed the presence of heparin on modified SFF surfaces. The surface morphology of the modified silk fibroin fabric surfaces was characterized by scanning electron microscopy (SEM) and atomic force microscopy (AFM), and obtained increased roughness. Negligible hemolytic effect and a higher concentration of free hemoglobin by a kinetic clotting time test ensured the improved biological performance of the modified fibroin fabric. Overall, the deposition of 2.5 bilayer was found effective in terms of biological and surface properties of the modified fibroin fabric compared to 1.5 bilayer self-assembly technique. Therefore, this novel approach to surface modification may demonstrate long term patency in future in vivo animal trials of small diameter silk fibroin vascular grafts.     

去白细胞采输血器的血液相容性体外评价

去白细胞采输血器是用于过滤全血或红细胞悬液中白细胞的医疗器械类产品,为保证其临床应用的安全性,本文对去白细胞采输血器（型号：NGL/RF-XZ-200）进行血液相容性体外评价.选择去白细胞采输血器的3个主要部件：软管、塑料血袋和去白细胞滤器滤膜为试验样品,以进口同类产品作为参照,按照GB/T 16886.4-2003和GB/T 14233.2-2005标准的要求和方法,进行溶血、PTT以及体外自发性血小板聚集3个体外血液相容性指标测试.结果 显示试验样品溶血率小于5%,样品凝血时间和血小板最大聚集率与参照样品无显著性差异（P〉0.05）.该结果表明去白细胞采输血器对血液成分和功能无明显不良影响,具有良好的血液相容性.     

In vitro study on the hemocompatibility of plasma electrolytic oxidation coatings on titanium substrates

Passively levitated ventricular assist devices (VADs) are vulnerable to impeller-housing contact and could benefit from surface coatings that improve wear resistance. Such coatings can be manufactured by plasma electrolytic oxidation (PEO), but their suitability for blood-contact applications needs further investigation. We therefore compared blood–surface interactions of polished titanium grade 5 (Ti Gr 5), as a general VAD reference material, uncoated ground titanium grade 4 (Ti Gr 4) and two commercially available PEO coatings on Ti Gr 4. In n = 4 static platelet adhesion tests, material samples were incubated with platelet-rich plasma (PRP) and consecutively analyzed for adhesive platelets by immunofluorescence microscopy. Additionally, PRP supernatant of incubated material samples was analyzed for changes in antithrombin III and fibrinogen concentrations by turbodimetry and enzyme-linked immunosorbent assay, respectively. We could not find any significant differences between the materials in the analyzed hemocompatibility markers (P > .05). Thus, we conclude that PEO coatings might offer a similar hemocompatibility to that of polished Ti Gr 5 and uncoated Ti Gr 4. Nevertheless, future studies should investigate blood–surface interactions of PEO coatings under realistic VAD-related flow conditions to better evaluate their potential for VAD applications.