共查询到19条相似文献,搜索用时 60 毫秒
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目的采用低温等离子体联合离子束技术对硅凝胶人工晶状体进行钛及钛基复合材料表面修饰,以提高人工晶状体的生物相容性。方法通过紫外光谱、接触角、化学分析用电子能谱(ESCA)对人工晶状体进行表面特性检测。结果修饰后人工晶状体对紫外光的吸收有所增加,其表面亲水性有所提高,人工晶状体表面获得适宜的化学组成。结论修饰后人工晶状体的表面特性得到改善。 相似文献
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目的 观察和分析Verisyse人工晶状体治疗高度近视的效果及其并发症.方法 高度近视13例19眼,术前平均球镜度数(-19.3±4.7 )D,平均柱镜度数 (-1.62±1.0 )D, 行Verisyse 人工晶状体置入术,观测术前及术后裸眼视力、屈光度、眼压、角膜内皮计数、术中和术后并发症.结果 术后3个月裸眼视力达到或超过术前最佳矫正视力,术后3个月平均角膜内皮计数较术前略减少,但无统计学差异(P>0.05),平均眼压与术前无统计学差异(P>0.05).2眼术中虹膜根部出血,1眼术中虹膜微小穿孔,2眼术后一过性眼压升高, 1眼术后人工晶体两次脱位.结论 Verisyse 人工晶状体矫治高度近视恢复快,效果显著,早期开展可见一些并发症. 相似文献
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目的比较分别行TetraneX可调人工晶状体(TetraflexIOL)与单焦点人工晶状体(SIOL)植人术后的白内障患者临床效果。方法收集2009年2月-2012年3月在我院行白内障超声乳化并植入人工晶体的白内障患者共70例99只眼;其中36例49只眼植入Tetraflex可调人工晶状体,为实验组;另外34例50只眼植入单焦点球面人工晶状体.为对照组。所有患者均符合纳入与排除标准,均由同一位经验丰富的医师行常规白内障超声乳化吸除术联合人工晶状体植入术。术后随访1d、1周及1个月,术后3个月于常规裂隙灯、视力和眼压检查,术后3个月检查患者屈光状态、裸眼远视力、最佳矫正远视力、裸眼近视力、最佳矫正近视力、最佳矫正远视力下的近视力、主观调节幅度。所得数据采用SPSS11.5软件进行统计学分析。结果术后3个月两组患者裸眼远视力、最佳矫正远视力、最佳矫正近视力差异无统计学意义(P〉0.05);实验组裸眼近视力明显好于对照组,两组差异有统计学意义(P〈0.05)。结论TetraflexIOL手术安全、有效,可为患者提供较佳的远、近视力,达到更高的脱镜率,但其远期临床效果有待于进一步研究。 相似文献
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囊袋张力环植入治疗外伤性晶状体脱位 总被引:3,自引:0,他引:3
目的探讨囊袋张力环(CTR)在外伤性晶状体悬韧带断裂的白内障手术中的植入时机。方法对24例(25眼)外伤性晶状体悬韧带部分断裂的患者行白内障手术,术中连续环形撕囊,行白内障超声乳化吸除后,囊袋内植入CTR及后房型人工晶状体。术后随访6个月~4年。结果术中无悬韧带断裂范围扩大,白内障皮质注吸干净。术后1个月矫正视力≤0.4者6眼,0.5~0.9者16眼,≥1.0者3眼。术后6个月散瞳检查,25眼的人工晶状体均处于正位,无倾斜及明显偏位。未见CTR引起的并发症。结论CTR应用于外伤性晶状体悬韧带断裂的白内障患者,利于人工晶状体囊袋内植入,有效防止术后人工晶状体偏位的发生。白内障超声乳化吸除后植入CTR利于术中操作,更安全可靠。 相似文献
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白内障为我国致盲的首要原因。我科自1988年开展人工晶体植入术以来,取得较为满意的效果。现报告79只眼后房型人工晶体植入术的结果,对并发症及手术技术改进讨论如下: 相似文献
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目的:探讨免疫磁珠(immunomagnetic beads,IMB)联合扫描电镜(scanning electron microscope,SEM)检测乳腺癌患者骨髓微转移(bone marrow micrometastasis,BMM)的临床意义。方法:采用IMB富集联合SEM鉴定的方法检测106例乳腺癌患者骨髓有核细胞中上皮来源细胞的阳性发生率,分析其与原发肿瘤大小、临床分期、腋淋巴结转移、病理组织学分级、雌孕激素受体蛋白(ER、PR)表达及术后1年远端转移发生情况等常用病理学观测指标的关系。结果:106例乳腺癌骨髓标本中,37例检测到肿瘤细胞,骨髓微转移阳性率为34.9%;乳腺癌BMM阳性率与原发肿瘤大小正相关(P〈0.05);临床分期越晚,出现BMM的概率也越高(P〈0.01);BMM不仅与腋淋巴结是否转移有关(P〈0.05),且随淋巴结转移数目增加,BMM阳性率亦增高(P〈0.05);此外,乳腺癌BMM阳性率还与病理组织学分级正相关(P〈0.05);与ER、PR蛋白在肿瘤组织中的表达负相关(P〈0.05);与术后1年内患者是否发生远端转移正相关(P〈0.05)。结论:IMB联合SEM检测骨髓微转移是具有潜在应用价值的乳腺癌早期诊断方法和预后指标。 相似文献
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正常人与肺癌患者胸膜间皮细胞扫描电镜观察 总被引:2,自引:2,他引:0
应用扫描镜超微病理技术,分析对比了肺癌患者胸膜间皮细胞与正常人胸膜间皮细胞间超微形态的异同。结果显示:正常成人胸膜脏层间皮细胞轮廓清楚,间皮细胞表面布满高低不一的微嵴及微绒毛。肺癌患者间皮细胞肿胀,细胞表面微嵴消失且出现大量细胞孔,浆膜游离面有大量渗液。依据扫描电镜所见,作者提出肺表面间皮细胞改变是肺癌导致胸水形成的形态学基础。 相似文献
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目的探讨增殖性糖尿病视网膜病变(PDR)二期患者硅油填充术后行硅油取出联合白内障手术的临床疗效。方法回顾性分析2008—2012年于我院行硅油取出联合白内障超声乳化、人工晶体植入术的PDR患者55例(61眼),术后视力恢复情况。结果术后1个月最佳矫正视力好于术前最佳矫正视力的40眼(74.07%),与术前相同的10眼(18.52%),低于术前最佳矫正视力的4眼(7.41%)。所有患者均无角膜内皮失代偿、人工晶体移位、复发性视网膜脱离等并发症发生。结论 PDR行玻璃体切除术后合并白内障的患者,取出硅油时联合白内障超声乳化、人工晶体植入术是经济、安全、有效的治疗方法。 相似文献
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Scanning electron microscopy of intrahepatic microvasculature casts following experimental hepatic artery embolization 总被引:3,自引:0,他引:3
Hiroshi Demachi M.D. Osamu Matsui Tsutomu Takashima 《Cardiovascular and interventional radiology》1991,14(3):158-162
The initial site of occlusion of the intrahepatic microvasculature in rats following hepatic artery embolization was studied
by scanning electron microscopy of microvasculature casts. The rats were divided into four groups: embolization with gelatin
powder (n=3), polyvinyl alcohol (n=3, 125–150 μm), gelatin sponge (n=3, 212–250 μm), and ionized oil. Not only the hepatic
arteires but also vessels in the peribiliary plexus were occluded. However, the size of the hepatic arteries and vessels of
the peribiliary plexus occluded correlated with the size of the embolic material, except in the case of the gelatin powder
which occluded vessels smaller than the particle size. 相似文献
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R. DeBattista T.J.U. Thompson C.E.L. Thompson R.L. Gowland 《Journal of Forensic and Legal Medicine》2013,20(6):770-776
Skeletal remains are excellent sources of information regarding the deceased individual and the taphonomic history of their body. However, the accuracy of this information is governed by our ability to interpret features on the surface of a bone. Little research in this respect has been carried out on remains found in aquatic environments. This study compares damage features created on the surface of modern and archaeological bone found in a seawater environment, to surface features present on unmodified bone, archaeological bone, pathological bone and burned bone. Results show that no similarities with regard to surface pores were identified between submerged modern bone and archaeological, pathological and burned bone. Similarities were seen between submerged and dry archaeological bones. Thus it is argued that the misinterpretation of the taphonomic history of isolated bones recovered from bodies of water should be avoidable in the forensic context. 相似文献
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目的 探讨在应用自动管电流调制技术(ATCM)和自动管电压调制技术(CARE kV)行头颈部和胸部CT螺旋扫描时,不同扫描中心对辐射剂量的影响。方法 联合ATCM和CARE kV技术,对头颈部和胸部模体行CT螺旋扫描。头颈部模体选取眼球中心向上4 cm、眼球、眼球与外耳孔连线中点、外耳孔、外耳孔向下5 cm 5种不同的扫描中心(即不同检查床高度),胸部模体选取乳腺向上5 cm和4 cm、乳腺、腋前线、腋中线、腋后线6种不同的扫描中心。每种扫描中心时定位像扫描3次,然后1次螺旋扫描。头颈部模体在眼眶中心及第5颈椎(C5)椎体上缘层面选取感兴趣区(ROI),胸部模体在肺尖及气管分叉层面选取ROI,测量记录对比噪声比(CNR)。用热释光剂量计(TLD)测量每次扫描时眼晶状体和乳腺的器官剂量。记录每次扫描的容积CT剂量指数(CTDIvol)。结果 头颈部模体5种不同扫描中心时,眼晶状体累积辐射剂量最高在眼球与外耳孔连线中点为中心(8.851 mGy),CTDIvol最高在外耳孔向下5 cm为中心(15.850 mGy)。眼晶状体累积辐射剂量最低在外耳孔向下5 cm为中心(7.096 mGy),CTDIvol最低在眼球、眼球与外耳孔连线中点、外耳孔为中心(均为15.380 mGy)。胸部模体6种不同扫描中心时,乳腺累积辐射剂量最高在乳腺为中心(6.467 mGy),CTDIvol最高在腋前线为中心(4.120 mGy)。腋后线为中心上述值最低(分别为4.794和3.540 mGy)。头颈部模体眼眶中心层面、C5椎体上缘层面的CNR分别为87.22~108.88和136.13~175.57;胸部模体肺尖层面、气管分叉处层面的CNR分别为75.19~116.92和42.85~86.78。结论 CT扫描中心的选择对CT扫描部位的辐射剂量,特别是对射线敏感的组织和器官的辐射剂量有很大影响。 相似文献
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目的 研究不育男性精子超微结构的形态特征。方法 利用透射电镜对8例不育男性新鲜精液标本中的精子头及尾部超微结构进行观察。结果 在电镜下不育男性精子存在多形态超微结构异常,有以下几种类型:(1)顶体异常精子,包括顶体膜受损,顶体发育不良、缺失,顶体内形成包涵体精子。(2)头部异常精子,包括其尖头精子、圆头精子、头部含空泡精子。(3)尾部异常精子:①尾部形态异常精子,包括无尾精子、短尾精子、卷尾精子、体尾胞质残余;②尾部结构异常精子,包括线粒体缺失精子、尾部线粒体多种形态和结构异常。结论不育男性精子存在顶体、头部、尾部线粒体、微管多种形态和结构异常。 相似文献
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Karl Schürmann Dierk Vorwerk Arthur Kulisch Christoph Rosenbaum Stefan Biesterfeld Rolf W. Günther 《Cardiovascular and interventional radiology》1995,18(6):383-390
Purpose Puncture of venous Wallstents and nitinol stents with dialysis needles was tested in an animal study.Methods In 15 sheep, divided into a group with prior surgical unilateral carotid-jugular shunt creation (9 sheep) and a second group without shunt creation (6 sheep), a self-expanding nitinol stent and/or a Wallstent were bilaterally placed into the jugular veins. After 1 month, 10 nitinol stents and 9 Wallstents were punctured weekly with a 15-gauge cannula over a period of 15 weeks. Stent patency was followed up by colorcoded duplex ultrasound and angiography. After sacrifice, high resolution X-rays of the removed vessels were taken to assess stent deformation. From histological slices, neointimal thickness inside the stents was measured and analyzed statistically.Results Puncturing of both the nitinol stent and the Wallstent was technically feasible. Stent deformations were not found. One stent stenosis, probably related to puncture, was observed. The pattern of intimal hyperplasia differed between the nitinol stent and the Wallstent. Outward bulge of the vascular layers over the stent struts was greater in nitinol stents. In the relevant area in between the stent struts there was no significant difference in intimal thickness between the two types of stents. Intimal thickness was more pronounced in shunted than in nonshunted animals only in the Wallstent subgroup (p = 0.025) and more pronounced in punctured than in nonpunctured stents only in the nitinol stent subgroup (p = 0.018).Conclusion Puncturing of stents was feasible without major short-term complications. Therefore, stent implantation into the punctured segment of a hemodialysis fistula may be indicated if there is no alternative treatment. 相似文献