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利用抓捕器成功取出肺动脉内断裂PICC管1例 被引量:1
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作者 覃文懿 张智 +1 位作者 陈正德 郑婉婷 《广东医科大学学报》 2023年第4期479-480,共2页
经外周静脉置入中心静脉导管(PICC)断裂是一种罕见的严重并发症。该文报道了在介入下利用抓捕器成功取出肺动脉内断裂PICC管1例及处理体会。
关键词 中心静脉导管 肺动脉 导管断裂
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The forty years of vermicular graphite cast iron development in China (Part Ⅰ) 被引量:4
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作者 QIU han-quan chen zheng-de 《China Foundry》 SCIE CAS 2007年第2期91-98,共8页
In China, the research and development of vermicular graphite cast iron (VGCI) as a new type of engineering material, were started in the same period as in other developed countries; however, its actual industrial app... In China, the research and development of vermicular graphite cast iron (VGCI) as a new type of engineering material, were started in the same period as in other developed countries; however, its actual industrial application was even earlier. In China, the deep and intensive studies on VGCI began as early as the 1960s. According to the incomplete statistics to date, more than 600 papers on VGCI have been published by Chinese researchers and scholars at national and international conferences, and in technical journals. More than ten types of production methods and more than thirty types of treatment alloy have been studied. Formulae for calculating the critical addition of treatment alloy required to produce VGCI have been put forward, and mechanisms for explaining the formation of dross during treatment were brought forward. The casting properties, metallographic structure, mechanical and physical properties and machining performance of VGCI, as well as the relationships between them, have all been studied in detail. The Chinese Standards for VGCI and VGCI metallographic structure have been issued. In China, the primary crystallization of VGCI has been studied by many researchers and scholars. The properties of VGCI can be improved by heat treatment and addition of alloying elements enabling its applications to be further expanded. Hundreds of kinds of VGCI castings have been produced and used in vehicles, engines, mining equipment, metallurgical products serviced under alternating thermal load, machinery, hydraulic components, textile machine parts and military applications. The heaviest VGCI casting produced is 38 tons and the lightest is only 1 kg. Currently, the annual production of the VGCI in China is about 200 000 tons. The majority of castings are made from cupola iron without pre-treatment, however, they are also produced from electric furnaces and by duplex melting from cupola-electric furnaces or blast furnace-electric furnace. Examples of typical applications for VGCI castings are introduced in this paper. In China, the technologies such as rapid testing of the molten metal and non-destructive testing of casting microstructure still need to be improved. Several proposals are put forward in this paper in order to improve the production of VGCI. Generally speaking, in China, the research, production, and application of vermicular graphite cast iron are at the same level as in other developed countries and in some fields China even takes lead. (332 references and 5 Tables) 展开更多
关键词 vermicular graphite cast iron China REVIEW
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The forty years of vermicular graphite cast iron development in China (Part Ⅱ) 被引量:1
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作者 QIU han-quan chen zheng-de 《China Foundry》 SCIE CAS 2007年第3期175-181,共7页
2.1 Manufac From the long turing methods From the long period of practical experiences of VGCI production, the following four points are very important for the successful production of VGCI
关键词 中国 石墨 蠕变 铸件
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中长导管对减少继发性甲状旁腺功能亢进患者术后静脉血栓形成的效果 被引量:1
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作者 郑昌蔚 陈正德 +4 位作者 陈晓敏 郑婉婷 谢丽君 陈伟杰 张智 《广东医学》 CAS 2022年第3期308-311,共4页
目的探究中长导管对减少继发性甲状旁腺功能亢进患者术后静脉血栓形成的有效性。方法选取继发性甲状旁腺功能亢进患者140例的临床资料进行分析,将其静脉输液通路分为中长导管组(70例)和静脉留置针组(70例),观察不同组间患者静脉补液出... 目的探究中长导管对减少继发性甲状旁腺功能亢进患者术后静脉血栓形成的有效性。方法选取继发性甲状旁腺功能亢进患者140例的临床资料进行分析,将其静脉输液通路分为中长导管组(70例)和静脉留置针组(70例),观察不同组间患者静脉补液出现的不良反应。结果静脉留置针组与中长导管组出现静脉血栓的患者中凝血酶原时间、活化部分凝血活酶时间和纤维蛋白原等此类影响静脉血栓形成的指标差异无统计学意义(P>0.05)。静脉炎、静脉血栓以及液体渗出在两组患者发生率的差异有统计学意义(P<0.05)。静脉留置针组患者发生静脉炎、静脉血栓以及液体渗出的发生率均显著高于中长导管组,差异有统计学意义(P<0.05)。结论继发性甲状旁腺功能亢进患者术后选用静脉输液通路时使用中长导管优于静脉留置针,中长导管能有效减少继发性甲状旁腺功能亢进患者术后静脉血栓的发生。 展开更多
关键词 继发性甲状旁腺功能亢进 输液通路 中长导管 留置针 静脉血栓
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The forty years of vermicular graphite cast iron development in China(Part Ⅲ)
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作者 QIU han-quan chen zheng-de 《China Foundry》 SCIE CAS 2007年第4期261-269,共9页
5 Heat treatment of VGCIResearch work has shown that the microstructure of VGCI can be modified by heat treatment to give improved properties; martensitic, bainitic, sorbitic and pearlitic structures can be produced b... 5 Heat treatment of VGCIResearch work has shown that the microstructure of VGCI can be modified by heat treatment to give improved properties; martensitic, bainitic, sorbitic and pearlitic structures can be produced by quenching, quenching plus tempering, austempering and normalisation respectively. The surface properties of VGCI can also be improved by high frequency induction hardening, tufftriding and ion nitriding to meet special requirements. 展开更多
关键词 中国 球墨铸铁 发展趋势 热处理
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