胶原海绵医治体表出血创面的动物实验观察

目的 检测胶原海绵的类型及其对体表出血创面的影响；方法 利用酸碱法从牛腱提取精制可溶性胶原蛋白，冻干制成海绵状止血材料，用SDS－PAGE电泳分析胶原海绵的成分；观察用此胶原海绵治疗家兔耳部出血和体表感染创面止血情况；结果 由I型胶原蛋白组成的胶原海绵不仅止血时间短、减少出血量，而且能促进创面愈合；结论 胶原海绵可作为创面止血修复材料。     

胶原止血海绵的结构与理化性能分析

对从牛腱中制备的胶原止因海绵进行了结构分析,结果表明所制备的止血海绵具有胶原蛋白的特征结构与组成,是纯度较高的胶原蛋白;理化性能测试表明原止血海绵质量稳定,从而证明了胶原止血海绵的制备工艺合理可靠。     

胶原海绵及其止血性能的研究

利用酸碱溶解法，从牛腱中提取了可溶性胶原材料。冻干法制得了胶原海绵止血材料。对胶原材料的氨基酸分析和紫外吸收光谱分析，证实了可溶性胶原的结构和氨基酸组成。物理性能测试和止血效果实验结果表明，胶原海绵亲水性强，而且具有优良的止血和粘附创而的能力。     

壳聚糖胶原海绵的抗菌止血性能

背景：胶原因具有良好的生物相容性和降解性能,常用于促进伤口愈合,但由于其不具备抗菌性能,不能预防伤口感染。目的：通过冷冻干燥法制备壳聚糖胶原海绵,使其兼具良好的抗菌及止血效果。方法：壳聚糖溶液与碳酸氢钠溶液在37℃下成凝胶态,利用冷冻干燥法制备壳聚糖/碳酸氢钠/Ⅰ型胶原海绵作为实验组,以壳聚糖海绵及壳聚糖/碳酸氢钠海绵为对照组,扫描电镜观测海绵的微观形貌,测定其pH值、孔隙率、吸水倍数、降解率及对金黄色葡萄球菌和大肠杆菌的抗菌率;利用CCK-8法和Live/Dead染色检测海绵浸提液的细胞毒性;使用大鼠截尾出血模型检测海绵的止血效果;建立大鼠皮肤创伤模型,通过苏木精-伊红染色及Masson染色观察海绵植入7 d后的组织愈合情况。结果与结论：(1)相较于其他两种海绵,壳聚糖/碳酸氢钠/Ⅰ型胶原海绵的绵孔隙更大,外壁更粗糙,吸水性更强、孔隙率及吸水倍数更大;而且壳聚糖/碳酸氢钠/Ⅰ型胶原海绵孔隙率均大于另外两种海绵(P <0.01);平均吸水倍数复合海绵大于壳聚糖海绵(P <0.000 1)和壳聚糖/碳酸氢钠海绵(P <0.05);(2)抗大肠杆菌率检测结果显示：壳聚糖海...     

几种胶原型创伤敷料制作的实验研究

介绍了几各胶原型创伤敷料研制的方法。冷冻牛腱经０．０５Ｍ乙酸处理（ＰＨ３．２）４８－７２ｈ后，捣碎过滤、脱泡、加太酸软骨素（８％），制成１．５－２．５％胶原溶液。该溶液在预冷或不预冷的模具内冷冻干燥，冻干的胶的海绵在０．２５％戊二醛溶液中交联２４ｈ。并以类似的方法研制成聚氨酯膜－胶原海绵复合膜，涂聚氨酯胶原膜，和纱布胶原膜三种创伤敷料。结果表明冷冻牛腱胶原性能稳定，冻干的胶原海绵具有良好的孔洞结构     

几丁糖/海藻酸敷料止血性能的实验研究

目的研究一种新型敷料：几丁糖／海藻酸敷料（本项目组自行研制，已申请国家专利）的止血性能。方法取新西兰兔4只，在背部两侧对称性剪5个直径1cm的圆型创口，分别与创面大小相当的几丁糖／海藻酸敷料和明胶海绵止血，观察与创面的粘附情况，记录出血时间：止血停止后，将几丁糖／海藻酸敷料和明胶海绵放入预先配制好的氰化高铁血红蛋白检测试剂中仔细清洗，用分光光度计在540nm波长处光度比色，测出的Hb光度吸收值表示出血量。结果几丁糖／海藻酸敷料与创面粘附较好，几丁糖／海藻酸敷料、明胶海绵组的出血时间分别为87.7±19.1妙、170.7±22.6妙，Hb光度吸收值分别为1.131±0.44、1.733±0.733，经统计学分析，两组数据都有显著性差异（P〈0.01），几丁糖／海藻酸敷料组明显优于明胶海绵组。结论几丁糖／海藻酸敷料具有较好的止血性能。     

胶原/壳聚糖止血敷料在外科伤口中的应用

背景：壳聚糖与胶原联合可更有效地止血。 目的：评价胶原/壳聚糖止血敷料的材料学性能及应用于外科伤口的生物相容性。 方法：以“生物材料,止血敷料,纱布,胶原/壳聚糖,生物相容性”为中文关键词,以“biomaterial;hemostatic material;bioresorbable material;hemostasis effect;hemostatic mechanism”为英文关键词,采用计算机检索2000-01/2010-06与生物敷料、胶原/壳聚糖止血材料在伤口或创面止血过程中应用相关的文献。 结果与结论：壳聚糖独特的生物学特性,具有广谱抑菌、促进上皮细胞生长及止血,促进创面愈合的作用,在体内具有良好的生物降解性与组织相容性,可用于指端损伤和肉芽创面的治疗,如制成伤口敷料、可吸收缝线、止血材料、防粘连剂、药物缓释及组织工程支架,用于平战时伤口的处理。     

合成烧伤敷料

本文综述了在制备烧伤敷料中所应考虑的各种因素,并以胶原材料为主,比较了凝胶、薄膜、海绵,以及单组分、复合型与交联型敷料的特点与应用。结果表明,在胶原海绵上复合一层半孔性塑料薄膜,不仅增加了敷料机械强度,而且阻止了水分损失和细菌污染,是一种比较理想的烧伤敷料。     

不同敷料修复创面的实验研究及临床应用评价

背景：各种材料以多种形式制成的创面敷料近年来发展迅速,复合应用或是制成凝胶、药膜的形式是目前研究和应用的热点。 目的：评价不同敷料在创面的实验研究或者临床应用。 方法：以 “敷料;创面;实验;应用”为关键词,对维普数据库2002-01/2011-10的相关文章进行计算机检索,纳入与敷料和创面相关的随机对照实验类文章,排除重复研究或Meta分析类文章,对22篇文献研究的资料结果进行提取、分析。 结果与结论：纳米银、聚维酮碘、壳聚糖、康复新等是用于实验动物创面的主要材料,分别与中空活性炭纤维、明胶海绵复合或是制成原位凝胶、药膜形式的材料,能最大程度地发挥抗感染、促进创面愈合的作用。壳聚糖、纳米银或者银离子、猪胶原纤维、生物光素、液超妥藻酸盐、痊愈妥等材料可用于临床患者创面,多是以复合或是制成水凝胶等形式,有利于发挥各自性能,更好地促进不同创面愈合。     

胶原敷料治疗烧伤创面愈合后色素沉着298例

目的探讨烧伤创面愈合后遗留色素沉着应用胶原敷料治疗的效果。方法选择2005年至2008年烧伤创面愈合后遗留色素沉着的患者298例,分为观察组和对照组,观察组148例,对照组150例。观察组的患者应用胶原敷料,而对照组采用避光治疗作对照研究。两组均连续治疗6周,在1、2、3、4、5、6周分别观察各组创面色素沉着改变的情况。结果采用胶原敷料的观察组有效例数130例,有效率为88％;对照组有效例数为24例,有效率为16％,两组比较差异有统计学意义（P〈0．05）。结论胶原敷料对于烧伤创面愈合后遗留的早期色素沉着,有一定的治疗效果。     

胶原蛋白在临床医学中的应用

胶原蛋白是一种天然存在的具有很高利用价值的生物物质,其特有的极低的抗原性、可生物降解性、生物吸收性、止血性能和促进细胞生长的功能,使得近年来在医药工业和医学临床的研究和应用日益广泛.本文在简述胶原蛋白特性与制备工艺的基础上,较为详细地介绍了胶原蛋白在烧伤、烫伤、止血和眼科治疗及其组织工程中的应用和进展.     

基于壳聚糖的医用可吸收止血贴的研究与应用

几丁质是自然界中合成的产量仅次于纤维素的天然有机化合物,其经过脱乙酰作用生成的壳聚糖具有优良的生物及化学性质;此外通过改变聚合度、脱乙酰度或经过不同官能团的修饰,壳聚糖的理化性质可以发生变化,因此它在生物医药和保健领域的应用倍受重视.本文首先叙述了壳聚糖及其衍生物与止血相关的性质与功能,说明了壳聚糖可作为止血贴主要材料的巨大应用价值,然后阐述了壳聚糖及其止血贴产品的研究现状与生产手段,最后依据目前研究现状,对基于壳聚糖的可吸收止血贴产品的未来发展趋势进行了展望.     

Evaluation of a Wound Dressing Composed of Hyaluronic Acid and Collagen Sponge Containing Epidermal Growth Factor in Diabetic Mice

Abstract

This study investigated the effect of a wound dressing composed of hyaluronic acid (HA) and collagen (Col) sponge containing epidermal growth factor (EGF) on wound healing in diabetic mice. High-molecular-weight (HMW) HA aqueous solution, hydrolyzed low-molecular-weight (LMW) HA aqueous solution and heat-denatured Col aqueous solution were mixed, followed by freeze-drying to obtain a spongy sheet. Cross-linkage between Col molecules was induced by UV irradiation to the spongy sheet (Type-I wound dressing). In a similar manner, a spongy sheet containing EGF (Type-II wound dressing) was prepared by freeze-drying the mixed solution of HMW-HA, LMW-HA and Col containing EGF. The efficacy of these products was evaluated in type-II diabetic BKS.Cg-+Lepr^db/+Lepr^db (db/db) mice. Wound dressings were applied to a full-thickness, dorsal skin defect measuring 1.5 cm × 2.0 cm, showing adipose tissue. In the control group, a commercially available artificial dermis composed of collagen spongy sheet (TERUDERMIS^®) was used. A commercially available polyurethane film dressing (Bioclusive^®) was applied over each wound dressing. After 1 week of application, wound conditions were evaluated based on their gross and histological appearances. Type-I and -II wound dressings promoted a decrease in wound size associated with angiogenesis and granulation tissue formation, compared with the artificial dermis. In particular, Type-II wound dressings promoted sufficient re-epithelialization. These findings indicate that the combination of HA, Col and EGF promotes wound healing by stimulating cell activity including cell migration and proliferation on the adipose tissue in a diabetic wound. Type-I and -II wound dressings would be useful to prepare a well-vascularized wound bed acceptable for split-thickness auto-skin grafting.     

胶原“人工皮”的研制及其生物物理特性

胶原“人工皮”由聚乙烯膜、尼龙筛网和胶原组成。动物实验证明,胶原“人工皮”应用于创面,可减少死腔,增加与创面的粘附力,控制细菌侵入和防止液体丢失。该“人工皮”可以替代猪皮或尸体皮应用于外科手术     

Assay for Hydroxyproline of Collagen Sponge

INTRODUCTION　　Collagen is a kind of proteins which widely exists in animal s tissues.Aboutonethird of all proteins presentin the living body are collagens.The collagen structure istypical in containing a repeating tripeptide sequence( Gly- Pro- Hyp) which causes theformation of a triple helical structure.Its molecule is30 0 nm long with a relativemolecular massof30 0 ,0 0 0 .Minimal antigenicity,high affinity to cells and blood clot-ting by interaction with platelets and excellentbioco…     

壳聚糖-胶原海绵的研制及其应用研究

以壳聚糖、胶原为主要原料 ,研制一种新型的创伤敷料 ,并对其在临床上的应用进行初步的探讨。首先制备高纯度的胶原蛋白溶液 ,使之与壳聚糖溶液键合 ,冷冻干燥成为海绵体。然后进行毒理学检测 ,包括急性毒性试验、刺激性试验、过敏性试验和溶血性试验 ;并在骨科的开放性创面上进行了临床试验。壳聚糖 -胶原海绵的毒理学试验均呈阴性 ,在临床上有促进创面愈合 ,阻止渗液溢出的功效。因此 ,所研制的壳聚糖—胶原海绵无毒副作用 ,具有良好的临床疗效 ,具备推广应用的前景     

Development of a Wound Dressing Composed of Hyaluronic Acid and Collagen Sponge with Epidermal Growth Factor

This study was designed to investigate the effect of a wound dressing composed of hyaluronic acid (HA) and collagen (Col) sponge containing epidermal growth factor (EGF) on various parameters of wound healing in vitro and in vivo. High-molecular-weight (HMW) HA solution, hydrolyzed low-molecular-weight (LMW) HA solution and heat-denatured Col solution were mixed, followed by freeze-drying to obtain a spongy sheet. Cross-linkage between Col molecules was induced by UV irradiation to the spongy sheet (Type-I dressing). In a similar manner, a spongy sheet containing EGF was prepared (Type-II dressing). The efficacy of these products was firstly evaluated in vitro. Fibroblast proliferation was assessed in culture medium in the presence or absence of a piece of each wound dressing. EGF stimulated cell proliferation after UV irradiation and dry sterilization at 110°C for 1 h. In the second experiment, fibroblasts-embedded Col gels were elevated to the air–liquid interface to create a wound surface model, on which wound dressings were placed and cultured for 1 week. Cell proliferation and the production of vascular endothelial growth factor (VEGF) and hepatocyte growth factor (HGF) were investigated. With Type-II dressings, the amounts of VEGF and HGF released from fibroblasts in the Col gel were significantly increased compared with Type-I dressing. Next, the efficacy of these products was evaluated in vivo using Sprague–Dawley (SD) rats. Wound conditions after 1 and 2 weeks of treatment with the wound dressings were evaluated based on the gross and histological appearances. Type-II dressings promoted a decrease in wound size, re-epithelialization and granulation tissue formation associated with angiogenesis. These findings indicate that the combination of HA, Col and EGF promotes wound healing by stimulating fibroblast function.