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填充剂可提高X光显影导管的安全性和舒适度 - China Medical Device Manufacturer
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Fri, January 19th, 2018

2009年12月CMDM电子快讯 » 技术新知
填充剂可提高X光显影导管的安全性和舒适度

By: Shana Leonard

碱式碳酸铋X光显影填充剂具有极佳的分散性,由此可以生产出表面平滑且无瑕疵的导管。
PolyMedex Discovery集团旗下的Foster公司(美国康涅狄格州,Putnam; www.fostercorporation.com)开发出了碱式碳酸铋X光显影聚合物增强技术,据称能提供比同类填充剂更好的性能和更平滑的表面。

碱式碳酸铋具有高不透明度,常用于微创手术,但其在塑料中的分散性较差,因此易出现表面缺陷。“碱式碳酸铋的分散性较差时,填充剂会在器械的表面形成团块,”工程总监Brian LaBrec解释说。当化合物混入塑料时,可形成凸块,而在导管挤出过程中,凸块则变得更明显。

“凸块可在器械上引起瑕疵,因此有过早失效的风险,且当其置入体内时可造成不适感,”LaBrec补充说。它是一个机械应力点,由此导致产品容易出现破裂或损伤。LaBrec说,这个问题已经很普遍了,现在医生在使用器械前通常先用手指在器械表面滑动,确保没有缺陷。如果通过这个简单的触觉测试发现问题,则医生将会退还次品。

随着最终用户需求的日益增加以及器械体积的减小,改善碱式碳酸铋的分散性变得愈来愈迫切。“随着薄壁、高精度产品的市场需求的日益上升,分散性差的问题就变得越来越突出,这会对产品的设计带来限制并造成医疗器械制造商的效益出现损失,”LaBrec说。

正是考虑到上述问题,Foster开始通过改变碱式碳酸铋的形态、密度、结晶度、表面积和颗粒大小改善其分散性。在此基础上,公司推出了碱式碳酸铋填充剂,该产品属于Lo-Pro X光显影医用化合物产品系列。公司相信这种添加剂具有比其它同类填充剂更佳的分散性,由此可以生产出更平滑的表面,提供更优质的性能。“我们感到这就是差异形成之处,”LaBrec强调说。“我们开发的产品具有更好的相容性和更佳的分散性。”

该填充剂可与大多数热塑塑料同时使用,据称可以提高挤出工艺的稳定性,公司将这种功效归功于颗粒形态和分散特性。该技术还可以维持经混合和挤出处理后的聚合物粘度的稳定性,这也有助于提高效益。

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