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金属塞充填射孔防砂联作技术研究与应用 被引量:2
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作者 韩宗正 《石油钻探技术》 CAS CSCD 北大核心 2013年第3期119-122,共4页
针对复合射孔防砂技术受地层参数影响、在疏松和致密地层应用效果不理想的问题,研究了金属塞充填射孔防砂联作技术。基于用整体金属塞取代松散颗粒状防砂材料的思路,改变防砂材料的形状与基本参数,实现防粒径0.1mm以上砂粒的要求。将20... 针对复合射孔防砂技术受地层参数影响、在疏松和致密地层应用效果不理想的问题,研究了金属塞充填射孔防砂联作技术。基于用整体金属塞取代松散颗粒状防砂材料的思路,改变防砂材料的形状与基本参数,实现防粒径0.1mm以上砂粒的要求。将20目的金属防砂网压制成单体的六瓣中空锥形体金属塞,金属塞射入预定的储层后,充填在套管射孔口和储层的一定深度部位,形成立体的不锈钢网隔砂层,把地层砂遮挡在油层孔道内;研制了金属塞充填防砂射孔装置;研究了射孔、防砂联作一次完成的工艺技术,以取代先射孔再防砂的复杂工艺。锦7块应用金属塞充填射孔防砂联作技术后,油井产出液含砂量小于0.03%,生产正常,1年内没有进行检泵作业。研究结果表明,该技术适用于疏松易出砂地层,防砂效果好,可为油层防砂提供新的技术支持。 展开更多
关键词 金属塞 充填 防砂 射孔 锦7块
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高温全金属可溶桥塞的研发与应用
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作者 杨敏 刘涛 +2 位作者 何宴 陈潇晗 邹文智 《石化技术》 CAS 2024年第1期82-84,共3页
全金属可溶桥塞作为最新的井下压裂分段工具,现场应用越来越广泛,但限于金属材料的特性,桥塞在高温条件下(≥120℃)的性能极不稳定。根据全金属可溶桥塞在高温条件下的特点,优选镁铝合金材料,优化桥塞结构,加工出满足设计要求的高温全... 全金属可溶桥塞作为最新的井下压裂分段工具,现场应用越来越广泛,但限于金属材料的特性,桥塞在高温条件下(≥120℃)的性能极不稳定。根据全金属可溶桥塞在高温条件下的特点,优选镁铝合金材料,优化桥塞结构,加工出满足设计要求的高温全金属可溶桥塞,并参考可溶桥塞行业标准要求,进行了室内测试评价。目前该高温桥塞已在现场进行了大量的应用,承压和溶解效果良好,满足现场施工要求。 展开更多
关键词 金属 温桥 镁铝合金 金属密封 非常规油气
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全金属可溶桥塞异形接触结构密封特性
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作者 崔璐 邹方 +3 位作者 程嘉瑞 王澎 李臻 窦益华 《润滑与密封》 CAS CSCD 北大核心 2023年第9期33-40,共8页
全金属可溶桥塞作为一种新型压裂工具,其密封结构是影响压裂效率的关键因素。为探究不同密封环结构对密封特性的影响,建立单槽形、椭圆形、双槽形、双曲形4种金属密封环结构的数值模型,利用有限元法,对密封环径向变形特征、密封性能进... 全金属可溶桥塞作为一种新型压裂工具,其密封结构是影响压裂效率的关键因素。为探究不同密封环结构对密封特性的影响,建立单槽形、椭圆形、双槽形、双曲形4种金属密封环结构的数值模型,利用有限元法,对密封环径向变形特征、密封性能进行分析,以及考虑双曲形结构表面粗糙度对密封接触面积、接触应力、接触面近场应力分布的影响。研究结果表明:随着锥体轴向位移量增加,4种密封环径向变形始终与锥体轴向位移量呈正相关规律,密封环最大、最小径向变形分别位于厚度较大外圆侧、厚度较小外圆侧;复杂接触面可以强化密封环的密封性能,在同样锥体轴向位移量下,双曲形密封环结构密封性能为最好,椭圆形密封环结构性能最差;考虑切向摩擦力时,摩擦因数越大,接触面近场Mises应力沿摩擦力方向发生偏移越明显。所得结论可为井下全金属可溶桥塞密封环的结构优选提供参考。 展开更多
关键词 金属可溶桥 径向变形 密封特性 摩擦力
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耐超高温全金属桥塞研制与室内试验测试 被引量:1
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作者 程宇雄 武广瑷 +3 位作者 吴世运 王黎 姜浒 顾鹏 《石油机械》 北大核心 2023年第5期94-100,116,共8页
针对目前可溶桥塞承压强度低、降解速率慢、无法适用于超高温环境的问题,创新性提出适用于超高温环境的全金属桥塞设计方案,同时开展可溶镁基合金的室温、高温下力学性能试验及高温溶解性能试验,并结合有限元分析结果完成桥塞关键部件... 针对目前可溶桥塞承压强度低、降解速率慢、无法适用于超高温环境的问题,创新性提出适用于超高温环境的全金属桥塞设计方案,同时开展可溶镁基合金的室温、高温下力学性能试验及高温溶解性能试验,并结合有限元分析结果完成桥塞关键部件材料优选,最终试制耐超高温全金属桥塞实物样机并开展室内试验测试,从室温承压性能、高温承压性能和溶解性能3个方面验证实际应用效果。研究结果表明:随着温度升高,相对于高伸长率可溶镁基合金,高强度可溶镁基合金抗拉强度和屈服强度下降幅度较小,伸长率变化幅度较大;在超高温环境中,可溶解镁基合金溶解速率呈现慢-快-慢现象,在溶解后48~72 h内溶解速率最快;研制的耐超高温全金属桥塞在205℃、质量分数2%的KCl水溶液中最高可承受压差70 MPa,并保持10 h有效密封;在模拟工况下的密闭容器中8 d可完全溶解,满足设计要求并具备入井条件。该研究可为开发适用于超高温环境的全金属桥塞提供技术支撑。 展开更多
关键词 压裂 金属 可溶镁基合金 耐超高温 承压试验 溶解试验 力学性能
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分段压裂工具全金属可溶桥塞密封环的研究与应用
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作者 杨超 杜朋 +2 位作者 何宴 杨敏 刘涛 《冶金与材料》 2023年第7期50-52,共3页
现阶段,针对非常规油气藏的更新改造,可溶桥塞工程施工已经成为容积压裂主流的技术特征。该方法所采用的易溶桥塞解决了压裂后钻磨难题,但井筒溶解速度比较慢、易堵塞井筒等诸多问题并未从根本上解决。因此许多企业仍在钻易溶桥塞进行通... 现阶段,针对非常规油气藏的更新改造,可溶桥塞工程施工已经成为容积压裂主流的技术特征。该方法所采用的易溶桥塞解决了压裂后钻磨难题,但井筒溶解速度比较慢、易堵塞井筒等诸多问题并未从根本上解决。因此许多企业仍在钻易溶桥塞进行通井,无形之中增加了工程成本。为解决这一问题,开发设计了一种以镁铝合金为基体的高延展性金属材料,根据更改其孔径来密封井筒。在一定温度和矿化度的压裂液环境下,总体能够溶解在井筒中,且溶解速率具有可控性,取代了传统易溶橡胶。 展开更多
关键词 分段压裂工具 镁基合金 延展金属 金属可溶桥
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非金属桥塞镶齿卡瓦的有限元分析及优化 被引量:12
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作者 喻冰 赵维斌 +2 位作者 雷璐侨 练章华 林铁军 《石油机械》 北大核心 2013年第8期68-70,75,共4页
运用Abaqus有限元软件对一种新型非金属桥塞镶齿卡瓦的锚定过程进行弹塑性接触有限元分析,获得了锚定时卡瓦牙及套管的弹塑性Mises应力分布、接触应力分布和接触力分布规律。分析结果表明,套管内壁所受卡瓦牙接触应力和接触力从卡瓦中... 运用Abaqus有限元软件对一种新型非金属桥塞镶齿卡瓦的锚定过程进行弹塑性接触有限元分析,获得了锚定时卡瓦牙及套管的弹塑性Mises应力分布、接触应力分布和接触力分布规律。分析结果表明,套管内壁所受卡瓦牙接触应力和接触力从卡瓦中部沿周向逐渐减小;同时,与卡瓦槽接触的各卡瓦牙底端最大Mises应力均接近于同套管接触的顶端应力值,卡瓦牙应力集中明显。将卡瓦牙和卡瓦结构优化设计后,避免了局部应力集中。卡瓦与套管之间接触应力和接触力的略微增大,也让卡瓦与套管的锚定更稳固。 展开更多
关键词 金属 镶齿卡瓦 有限元分析 优化设计
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铝/裸钢板冷金属过渡点塞焊接头组织及力学性能 被引量:6
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作者 黄倩 曹睿 +2 位作者 朱海霞 陈剑虹 王培中 《焊接学报》 EI CAS CSCD 北大核心 2014年第11期59-62,116,共5页
采用Al Si5铝合金焊丝,冷金属过渡方法对6061铝合金和裸钢板进行了搭接点塞焊试验,运用正交试验法优化工艺参数,分析了接头的界面结构特征及其性能.结果表明,采用上述方法成功实现了铝和裸钢板的连接,点焊接头成形美观、性能良好;工艺... 采用Al Si5铝合金焊丝,冷金属过渡方法对6061铝合金和裸钢板进行了搭接点塞焊试验,运用正交试验法优化工艺参数,分析了接头的界面结构特征及其性能.结果表明,采用上述方法成功实现了铝和裸钢板的连接,点焊接头成形美观、性能良好;工艺参数显著性顺序为裸钢板孔径大小、点焊时间、送丝速度;接头为典型的点熔钎焊接头,由钎焊结合区和熔焊结合区组成;接头上的缺陷主要是气孔;接头的最大抗拉剪载荷可达4 k N以上,断裂方式为撕裂型断裂. 展开更多
关键词 金属过渡点 铝/裸钢板 正交试验 力学性能
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柴油机预热减排金属电热塞的研究 被引量:4
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作者 武龙 《农业装备与车辆工程》 2010年第3期34-37,共4页
利用电加热产生高温的原理,通过对发动机缸内燃油加热点燃,从而提高柴油机在低温下的冷起动性能及降低蓝烟排放,快速发热金属电热塞的最快发热速度可达到850℃时间小于3s,普通金属电热塞发热速度可达到850℃时间小于7s。采用不同材料制... 利用电加热产生高温的原理,通过对发动机缸内燃油加热点燃,从而提高柴油机在低温下的冷起动性能及降低蓝烟排放,快速发热金属电热塞的最快发热速度可达到850℃时间小于3s,普通金属电热塞发热速度可达到850℃时间小于7s。采用不同材料制作出不同性能特点的电热塞产品,同时不同性能特点的金属电热塞产品对于发动机的低温起动性能和减排效果有不同的影响。 展开更多
关键词 电热 预热 冷起动 柴油机 金属电热
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钛粉末冶金进展 被引量:4
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作者 刘延昌 《稀有金属快报》 CSCD 2003年第5期14-16,共3页
关键词 钛合金 粉末冶金 钛粉 粉末注射成形 近终形成形 金属塞复合材料
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Self-expandable metallic stents for malignant biliary obstruction:Efficacy on proximal and distal tumors 被引量:12
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作者 Jui-Hao Chen Cheuk-Kay Sun +1 位作者 Chao-Sheng Liao Chain-Smoke Chua 《World Journal of Gastroenterology》 SCIE CAS CSCD 2006年第1期119-122,共4页
AIM: To compare the efficacy of self-expandable metallic stents (EMS) in the treatment of distal and proximal stricture of malignant biliary tumors. METHODS: From March 1995 to June 2004, 61 patients (40 males, 2... AIM: To compare the efficacy of self-expandable metallic stents (EMS) in the treatment of distal and proximal stricture of malignant biliary tumors. METHODS: From March 1995 to June 2004, 61 patients (40 males, 21 females) with malignant biliary obstruction who received self-expandable metallic stent implantation were reviewed retrospectively. The stents were inserted by an endoscopic or percutaneous transhepatic method. We tried to place two stents in the biliary system in T or Y configuration in cases of hilar tumors with bilateral hepatic duct obstruction. The end points of the study were stent occlusion or patient death. RESULTS: The mean time of stent patency was 421 ± 67 d in the group of proximal stricture( group Ⅰ) and 168 ± 18 d in the group of distal stricture (group Ⅱ). The difference was significant in borderline between the two groups (P = 0.0567). The mean survival time was 574 ± 76 d in group I and 182 ± 25 d in group II. There was a significant difference between the two groups (P = 0.0005). CONCLUSION: EMS implantation is a feasible, palliative method for unresectable malignant biliary obstruction. The clinical efficacy of EMS in patients with proximal hilar tumors is better than that in patients with distal tumors. 展开更多
关键词 Metallic stent Biliary malignancy
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Self-expanding metallic stents drainage for acute proximal colon obstruction 被引量:30
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作者 Li-Qin Yao Yun-Shi Zhong Mei-Dong Xu Jian-Min Xu Ping-Hong Zhou Xian-Li Cai 《World Journal of Gastroenterology》 SCIE CAS CSCD 2011年第28期3342-3346,共5页
AIM: To clarify the usefulness of the self-expanding metallic stents (SEMS) in the management of acute proximal colon obstruction due to colon carcinoma before curative surgery.METHODS: Eighty-one colon (proximal to s... AIM: To clarify the usefulness of the self-expanding metallic stents (SEMS) in the management of acute proximal colon obstruction due to colon carcinoma before curative surgery.METHODS: Eighty-one colon (proximal to spleen flex) carcinoma patients (47 males and 34 females,aged 18-94 years,mean = 66.2 years) treated between September 2004 and June 2010 for acute colon obstruction were enrolled to this study,and their clinical and radiological features were reviewed.After a cleaning enema was administered,urgent colonoscopy was performed.Subsequently,endoscopic decompression using SEMS placement was attempted.RESULTS: Endoscopic decompression using SEMS placement was technically successful in 78 (96.3%) of 81 patients.Three patients’ symptoms could not be relieved after SEMS placement and emergent operation was performed 1 d later.The site of obstruction was transverse colon in 18 patients,the hepatic flex in 42,and the ascending colon in 21.Following adequate cleansing of the colon,patients’ abdominal girth was decreased from 88 ± 3 cm before drainage to 72 ± 6 cm 7 d later,and one-stage surgery after 8 ± 1 d (range,7-10 d) was performed.No anastomotic leakage or postoperative stenosis occurred after operation.CONCLUSION: SEMS placement is effective and safe in the management of acute proximal colon obstruction due to colon carcinoma,and is considered as a bridged method before curative surgery. 展开更多
关键词 ENDOSCOPE Proximal colon cancer OBSTRUCTION Self-expanding metallic stents Drainage
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Treatment of gastric outlet and duodenal obstructions with uncovered expandable metal stents 被引量:4
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作者 Qiang Huang Ding-Ke Dai Xiao-lun Qian Ren-You Zhai 《World Journal of Gastroenterology》 SCIE CAS CSCD 2007年第40期5376-5379,共4页
AIM:To investigate and evaluate the technical feasibility and clinical effectiveness of fluoroscopically guided peroral uncovered expandable metal stent placement to treat gastric outlet and duodenal obstructions. MET... AIM:To investigate and evaluate the technical feasibility and clinical effectiveness of fluoroscopically guided peroral uncovered expandable metal stent placement to treat gastric outlet and duodenal obstructions. METHODS:Fifteen consecutive patients underwent peroral placement of Wallstent^(TM)Enteral Endoprosthesis to treat gastric outlet and duodenal obstructions(14 malignant,1 benign).All procedures were completed under fluoroscopic guidance without endoscopic assistance.Follow-up was completed until the patients died or were lost,and the clinical outcomes were analyzed. RESULTS:The technique success rate was 100%,and the oral intake was maintained in 12 of 14 patients varying from 7 d to 270 d.Two patients remained unable to resume oral intake,although their stents were proven to be patent with the barium study.One patient with acute necrotizing pancreatitis underwent enteral stenting to treat intestinal obstruction,and nausea and vomiting disappeared.Ten patients died during the follow- up period,and their mean oral intake time was 50 d. No procedure-related complications occurred.Stent migration to the gastric antrum occurred in one patient 1 year after the procedure,a tumor grew at the proximal end of the stent in another patient 38 d post-stent insertion. CONCLUSION:Fluoroscopically guided peroral metal stent implantation is a safe and effective method to treat malignant gastrointestinal obstructions,and complications can be ignored based on our short-term study.Indications for this procedure should be discreetly considered because a few patients may not benefit from gastrointestinal insertion,but some benign gastrointestinal obstructions can be treated using this procedure. 展开更多
关键词 Gastric outlet obstruction Duodenal obstruction Expandable metal stent
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偏心楔钻进技术的改进与应用 被引量:7
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作者 罗晓斌 罗凯 《探矿工程(岩土钻掘工程)》 2012年第10期23-25,31,共4页
偏心楔是定向钻进技术的一种方法和手段,偏心楔钻进技术的关键工序是孔底架桥和在硬岩地层过楔面钻进技术。通过生产、科研相结合,对液压金属孔底塞和金刚石钻头进行了改进研究,经过几年的生产应用和3个钻孔应用效果对比,取得了较好的... 偏心楔是定向钻进技术的一种方法和手段,偏心楔钻进技术的关键工序是孔底架桥和在硬岩地层过楔面钻进技术。通过生产、科研相结合,对液压金属孔底塞和金刚石钻头进行了改进研究,经过几年的生产应用和3个钻孔应用效果对比,取得了较好的效果。 展开更多
关键词 偏心楔 定向钻进 架桥 液压金属孔底 金刚石钻头
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Endoscopic management of occluded biliary uncovered metal stents:A multicenter experience 被引量:2
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作者 Panagiotis Katsinelos Athanasios Beltsis +10 位作者 Grigoris Chatzimavroudis Dimitris Paikos George Paroutoglou Dimitris Kapetanos Sotiris Terzoudis Georgia Lazaraki Ioannis Pilpilidis Kostas Fasoulas Stefanos Atmatzidis Christos Zavos Jannis Kountouras 《World Journal of Gastroenterology》 SCIE CAS CSCD 2011年第1期98-104,共7页
AIM:To compare diverse endoscopic interventions in the management of occluded uncovered self-expanding metal stents(SEMSs) that had been placed for palliative treatment of unresectable malignant biliary obstruction.ME... AIM:To compare diverse endoscopic interventions in the management of occluded uncovered self-expanding metal stents(SEMSs) that had been placed for palliative treatment of unresectable malignant biliary obstruction.METHODS:A retrospective review was undertaken in 4 tertiary endoscopic centers to determine optimal management of different types of occluded SEMSs.The technical success of performed treatment in occluded SEMSs,the patency of the stent,the need for re-intervention and the financial costs of each treatment were analyzed.RESULTS:Fifty four patients were included in the analysis;21 received Hanaro,19 Wallstent and 14 Flexus.For the relief of obstruction,a plastic stent was inserted in 24 patients,a second SEMS in 25 and mechanical cleaning was performed in 5 patients.The overall median second patency rates between second SEMSs and plastic stents did not differ(133 d for SEMSs vs 106 d for plastic stents;P = 0.856).Similarly,no difference was found between the overall survival of SEMS and plastic stent groups,and no procedure-related complications occurred.Incremental cost analysis showed that successive plastic stenting was a cost-saving strategy at least in Greece.CONCLUSION:Insertion of uncovered SEMSs or plastic stents is a safe and effective treatment for occluded uncovered SEMSs;insertion of plastic stents appears to be the most cost-effective strategy. 展开更多
关键词 Biliary obstruction Gastrointestinal neoplasms STENTS Cost effectiveness
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Effect of surface treatment to inserted ring on Al–Fe bonding layer of aluminium piston with reinforced cast iron ring 被引量:2
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作者 孙兰 李长案 +1 位作者 屠静雯 彭明诚 《Journal of Central South University》 SCIE EI CAS 2014年第8期3037-3042,共6页
In order to improve the bonding strength between piston alloys and cast iron ring of aluminum piston with reinforced cast iron ring,the different methods of the surface treatments(shot blasting and sand blasting) to t... In order to improve the bonding strength between piston alloys and cast iron ring of aluminum piston with reinforced cast iron ring,the different methods of the surface treatments(shot blasting and sand blasting) to the cast iron ring are experimented.The optical micrograph shows that an intermetallic layer and a ligulate shaped structure are formed between piston alloys and cast iron base ring.After sand blasting treatment,the ring surface is non-metal shiny,matte-like and has no obvious pits.The intermetallic layer thickness formed between piston alloys and cast iron is thinner and more equally distributed after sand blasting to the ring.The content of the graphite distributed the interfacial zone after the shot blasting treatment is little.With the increase of time by sand blasting,the hardness starts to slightly descend.The bonding strength of the sample by sand blasting is obviously higher than that by shot blasting and increases from 9.32 MPa to 19.53 MPa. 展开更多
关键词 PISTON cast iron ring surface treatment shot blasting sand blasting intermetallic bonding
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One-step palliative treatment method for obstructive jaundice caused by unresectable malignancies by percutaneous transhepatic insertion of an expandable metallic stent 被引量:29
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作者 Hiroshi Yoshida Yasuhiro Mamada +10 位作者 Nobuhiko Taniai Yoshiaki Mizuguchi Tetsuya Shimizu Shigeki Yokomuro Takayuki Aimoto Yoshiharu Nakamura Eiji Uchida Yasuo Arima Manabu Watanabe Eiichi Uchida Takashi Tajiri 《World Journal of Gastroenterology》 SCIE CAS CSCD 2006年第15期2423-2426,共4页
AIM: To describe a simple one-step method involving percutaneous transhepatic insertion of an expandable metal stent (EMS) used in the treatment of obstructive jaundice caused by unresectable malignancies. METHODS... AIM: To describe a simple one-step method involving percutaneous transhepatic insertion of an expandable metal stent (EMS) used in the treatment of obstructive jaundice caused by unresectable malignancies. METHODS: Fourteen patients diagnosed with obstructive jaundice due to unresectable malignancies were included in the study. The malignancies in these patients were a result of very advanced carcinoma or old age. Percutaneous transhepatic cholangiography was performed under ultrasonographic guidance. After a catheter with an inner metallic guide was advanced into the duodenum, an EMS was placed in the common bile duct, between a point 1 cm beyond the papilla of Vater and the entrance to the hepatic hilum. In cases where it was difficult to span the distance using just a single EMS, an additional stent was positioned. A drainage catheter was left in place to act as a hemostat. The catheter was removed after resolution of cholestasis and stent patency was confirmed 2 or 3 d post-procedure. RESULTS: One-step insertion of the EMS was achieved in all patients with a procedure mean time of 24.4 min. Out of the patients who required 2 EMS, 4 needed a procedure time exceeding 30 min. The mean time for removal of the catheter post-procedure was 2.3 d. All patients died of malignancy with a mean follow-up time of 7.8 mo. No stent-related complication or stent obstruction was encountered. CONCLUSIONS: One-step percutaneous transhepaticinsertion of EMS is a simple procedure for resolving biliary obstruction and can effectively improve the patient's quality of life. 展开更多
关键词 Expandable metallic stent Bile duct carcinoma Gall bladder carcinoma Pancreatic carcinoma Gastric carcinoma Obstructive jaundice
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Shear band formation in shaped rheocast aluminium component at various plunger velocities 被引量:1
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作者 M.BLADH M.WESSN A.K.DAHLE 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第9期1749-1755,共7页
Significant progress has been made in recent years in understanding and modelling the rheology of semi-solid metals.These models show the effects of the microstructure in terms of size and morphology of globules on th... Significant progress has been made in recent years in understanding and modelling the rheology of semi-solid metals.These models show the effects of the microstructure in terms of size and morphology of globules on the material response.More recently it has been shown that semi-solid metals can behave as compacted granular materials such as sand.A particular signature of such deformation is that the deformation becomes concentrated into shear bands which are 10-20 grains wide.Such bands have also been observed in a range of cast products.Recently, it has been clearly shown that shear bands in high pressure die cast (HPDC) products are also the results of Reynolds dilatancy.Shear bands are also known to be a common feature in semi-solid metal products.The segregation banding in semi-solid metal (SSM) material and its dependence of plunger velocity were investigated.Shaped castings were made with the RHEOMETALTM process with a range of different plunger velocities.The microstructural characteristics were investigated, with a particular emphasis on shear bands.It is shown that ingate velocities influence the location and characteristics of the shear bands. 展开更多
关键词 RHEOCASTING shear bands SEGREGATION AL-ALLOYS RHEOMETAL^TM
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Self-expanding metal stents for the palliation of malignant gastric outlet obstruction in patients with peritoneal carcinomatosis 被引量:2
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作者 Christoph Rademacher Matthias Bechtler +3 位作者 Steffen Schneider Bettina Hartmann Johannes Striegel Ralf Jakobs 《World Journal of Gastroenterology》 SCIE CAS 2016年第43期9554-9561,共8页
AIM To evaluate the efficacy of self-expanding metal stents(SEMS) for the palliation of malignant gastric outlet obstruction in patients with and without peritoneal carcinomatosis(PC).METHODS We performed a retrospect... AIM To evaluate the efficacy of self-expanding metal stents(SEMS) for the palliation of malignant gastric outlet obstruction in patients with and without peritoneal carcinomatosis(PC).METHODS We performed a retrospective analysis of 62 patients who underwent SEMS placement for treatment of malignant gastroduodenal obstruction at our hospital over a six-year period. Stents were deployed through the scope under combined fluoroscopic and endoscopic guidance. Technical success was defined as successful stent placement and expansion. Clinical success was defined as an improvement in the obstructive symptoms and discharge from hospital without additional parenteral nutrition. According to carcinomatosis status, patients were assigned into groups with or without evidence of peritoneal disease.RESULTS In most cases, obstruction was caused by pancreatic(47%) or gastric cancer(23%). Technical success was achieved in 96.8%(60/62), clinical success in 79%(49/62) of all patients. Signs of carcinomatosis were identified in 27 patients(43.5%). The diagnosis was confirmed by pathology or previous operation in 7 patients(11.2%) and suspected by CT, MRI or ultrasound in 20 patients(32.2%). Presence of carcinomatosis was associated with a significantly lower clinical success rate compared to patients with no evidence of peritoneal disease(66.7% vs 88.6%, P = 0.036). There was no significant difference in overall survival between patients with or without PC(median 48 d vs 70 d, P = 0.21), but patients showed significantly longer survival after clinical success of SEMS placement compared to those experiencing clinical failure(median 14.5 d vs 75 d, P = 0.0003).CONCLUSION Given the limited therapeutic options and a clinical success rate of at least 66.7%, we believe that SEMS are a reasonable treatment option in patients with malignant gastric outlet obstruction with peritoneal carcinomatosis. 展开更多
关键词 Gastric outlet obstruction Self-expanding metal stents Peritoneal carcinomatosis PALLIATION ENDOSCOPY
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Safety and efficacy of self-expandable metallic stents in malignant small bowel obstructions 被引量:2
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作者 Akiyoshi Tsuboi Toshio Kuwai +7 位作者 Tomoyuki Nishimura Sumio Iio Takeshi Mori Hiroki Imagawa Toshiki Yamaguchi Atsushi Yamaguchi Hirotaka Kouno Hiroshi Kohno 《World Journal of Gastroenterology》 SCIE CAS 2016年第40期9022-9027,共6页
In this report, we present 3 cases of malignant small bowel obstruction, treated with palliative care using endoscopic self-expandable metallic stent(SEMS) placement, with the aim to identify the safety and efficacy o... In this report, we present 3 cases of malignant small bowel obstruction, treated with palliative care using endoscopic self-expandable metallic stent(SEMS) placement, with the aim to identify the safety and efficacy of this procedure. Baseline patient characteristics, procedure methods, procedure time, technical and clinical success rates, complications, and patient outcomes were obtained. All 3 patients had pancreatic cancer with small bowel strictures. One patient received the SEMS using colonoscopy, while the other 2 patients received SEMS placement via double balloon endoscopy using the through-the-overtube technique. The median procedure time was 104 min. The technical and clinical success rates were 100%. Post-treatment, obstructive symptoms in all patients improved, and a low-residue diet could be tolerated. All stents remained within the patients until their deaths. The median overall survival time(stent patency time) was 76 d. SEMS placement is safe and effective as a palliative treatment for malignant small bowel obstruction. 展开更多
关键词 Self-expandable metallic stents Malignant small bowel obstructions ENDOSCOPY Case report Pancreatic cancer
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Trace Metals in Water Samples Taken from Azerbaijan Sector of Caspian Sea 被引量:1
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作者 Famil Yusif Humbatov Majid Mirza Ahmadov Valeh Saleh Balayev Bahruz Allahverdi Suleymanov 《Journal of Chemistry and Chemical Engineering》 2015年第4期288-295,共8页
The present study was conducted to investigate the heavy metal contents (As, Ba, Cd, Co, Cr, Cu, Ga, Mo, Mn, Rb, Pb, Cu, Ni, V, U and Zn) in seawater samples, which were collected at two c (5 and 100 m), from 9 di... The present study was conducted to investigate the heavy metal contents (As, Ba, Cd, Co, Cr, Cu, Ga, Mo, Mn, Rb, Pb, Cu, Ni, V, U and Zn) in seawater samples, which were collected at two c (5 and 100 m), from 9 different sites of Azerbaijan sector of the Caspian Sea. The Agitent 7700x Series ICP-MS (inductively coupled plasma mass spectrometry) with HMI (high matrix introduction) system applied to analysis seawater. It was shown, the average concentrations of elements as Cr, Co, Cu, Mn, Pb and Zn in surface water slightly higher than their concentrations in depth water at 100 m. Practically it is not deference of the Mo, Rb and U average concentrations in surface and 100 m depth column water. There was little variation observed for nickel and vanadium. In contrast the concentrations of As, Ga and Ba in samples taken from 100 m, were significantly higher than the concentration in surface samples. Dependence concentration of elements from water columns depth can be explained in accordance with the geochemical system of classification of dissolved forms of elements in the sea water. 展开更多
关键词 Heavy metals Caspian Sea ICP-MS polution.
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