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    • 14. 发明授权
    • Boron nitride fiber and process for production thereof
    • 氮化硼纤维及其制造方法
    • US5780154A
    • 1998-07-14
    • US556985
    • 1995-11-22
    • Yoshio OkanoHiroya Yamashita
    • Yoshio OkanoHiroya Yamashita
    • D01F9/10B32B9/00
    • D01F9/10Y10T428/2913Y10T428/2916
    • A boron nitride fiber comprising hexagonal and/or turbostratic boron nitride having C planes oriented substantially parallel to the fiber axis and a degree of orientation of 0.74 or above can be obtained by heating an adduct between a boron trihalide such as boron trichloride or the like and a nitrile compound such as acetonitrile, benzonitrile or the like, and an ammonium halide or a primary amine hydrohalide in the presence of a boron trihalide at around 125.degree. C. to form a boron nitride precursor, dissolving the boron nitride precursor in a solvent such as N,N'-dimethyl formamide or the like, capable of dissolving the precursor, spinning the solution to obtain a boron nitride precursor fiber, heat-treating the precursor fiber in an inert gas atmosphere and then in an ammonia gas atmosphere to obtain a boron nitride fiber, and heat-treating the boron nitride fiber with a tensile stress being applied to the fiber. The boron nitride fiber of the present invention has a degree of orientation of 0.74 or above and therefore has a high tensile strength.
    • PCT No.PCT / JP95 / 00500 Sec。 371日期1995年11月22日 102(e)日期1995年11月22日PCT 1995年3月20日PCT公布。 公开号WO95 / 25834 日期1995年9月28日包含六边形和/或膨胀氮化硼的氮化硼纤维可以通过加热三硼化硼(例如硼)之间的加合物来获得,其中C面平行于纤维轴取向,取向度为0.74以上 三氯化物等,以及腈化合物如乙腈,苄腈等,以及卤化铵或伯胺氢卤化物,在三卤化硼存在下在约125℃下反应形成氮化硼前体,将氮化硼 在溶剂如N,N'-二甲基甲酰胺等溶剂中前体,能够溶解前体,纺丝溶液得到氮化硼前体纤维,在惰性气体气氛中,然后在氨中热处理前体纤维 气体气氛以获得氮化硼纤维,并且将拉伸应力施加到纤维上的氮化硼纤维进行热处理。 本发明的氮化硼纤维的取向度为0.74以上,因此具有高的拉伸强度。
    • 20. 发明授权
    • PVA and silica particle blood vessel model
    • PVA和二氧化硅颗粒血管模型
    • US08758797B2
    • 2014-06-24
    • US13392177
    • 2010-09-09
    • Yoshio Okano
    • Yoshio Okano
    • A61F2/02G09B23/28
    • G09B23/303A61F2/06A61K9/0024G09B23/285
    • A blood vessel model which imitates a human blood vessel including an aqueous gel made from polyvinyl alcohol having an average polymerization degree of 300 to 3500 and a saponification degree of 90% by mole or more, and silica particles; and a method for producing a blood vessel model which imitates a human blood vessel, including filling a mixed solution containing polyvinyl alcohol having an average polymerization degree of 300 to 3500 and a saponification degree of 90% by mole or more, silica particles and water in a mold for forming a blood vessel model, and freezing the mixture at a temperature of −10° C. or lower, followed by thawing. The blood vessel model can be suitably used as a blood vessel model for practicing insertion of a stent graft into an aneurysm, a blood vessel model for practicing resection or ligation surgery of a blood vessel, and the like.
    • 一种模拟人体血管的血管模型,包括平均聚合度为300〜3500,皂化度为90摩尔%以上的聚乙烯醇制成的水性凝胶和二氧化硅粒子; 以及制造模拟人血管的血管模型的方法,包括将含有平均聚合度为300〜3500,皂化度为90摩尔%以上的聚乙烯醇的混合液填充到二氧化硅粒子和水中 用于形成血管模型的模具,并将混合物在-10℃或更低的温度下冷冻,然后解冻。 血管模型可以适合用作用于将支架移植物插入动脉瘤的血管模型,用于实践血管切除或结扎手术的血管模型等。