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薄壁聚氨酯导管解决了外科医生的难题 - China Medical Device Manufacturer
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Wed, January 17th, 2018

2009年7/8月CMDM电子快讯 » 技术新知
薄壁聚氨酯导管解决了外科医生的难题

自然腔道内镜手术(NOTES)和单孔腹腔镜(SPA)等外科手术方法对微创手术的参数进行了重新定义。临床医生所用的介入点少而大,这就需要能尽量扩大内部工作空间的仪器。同时必须能够用最小的力操作连接体内的器械。因此器械的外壳直径必须比传统挤出件更大、壁更薄,且高度柔韧耐用。采用传统方法生产符合上述要求的挤出导管具有一定的困难。Putnam Plastics 公司称已开发出一种技术,可生产薄壁、大直径、低硬度氨酯挤压件,从而扫除了这些障碍。

从功能角度看,热塑性聚氨酯是此类要求苛刻应用的主要选择。但该材料在设计制造可行性方面还面临诸多挑战。

产品经理Byron Flagg解释道:“随着直径增大以及壁厚和硬度下降,挤制工艺变 得越来越不稳定。这种不稳定性会导致公差增大,生产率降低,迫使器械工程师在设计上做出相应的让步。即便在制造完成后,这些挤出件也极难做到没有污染或损伤,进而导致产品质量不合格,装置价格升高,为客户创造的总价值下降。”

Putnam Plastics公司将定制设备与先进的加工条件相结合,解决了上述难题。 工艺稳定性得到改善后,扩大了器械工程师的设计范围,而材料处理技术提高则可增加产量、提升产品质量,从而实现成本降低。Putnam lastics公司列举了下面的 例子:硬度为80A的聚氨酯挤出件直径超过12.7 mm,采用新技术可将壁厚降至0.08 mm(采用传统技术的最小壁厚为0.38 mm),而OD 公差为0.05 mm (原来为0.25 mm)。

此新特性适用于一系列定制挤出设计,并可与具有共挤出、多腔、钢丝增强等特性的设计结合发挥功能。它对外径超过12.7 mm、壁厚小于0.38 mm且硬度低于90A的聚氨酯导管影响最大。


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