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低温工艺可去除PEEK植入物上的毛刺 - China Medical Device Manufacturer
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Fri, January 19th, 2018

2009年11月CMDM电子快讯 » 技术新知
低温工艺可去除PEEK植入物上的毛刺

By: Shana Leonard

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低温工艺可有效去除PEEK植入物上的毛刺。

对于植入物而言,具有光滑的表面是至关重要的,因为诸如毛刺等缺陷的存在可对患者的健康产生严重危害。但由于去除毛刺的成本较高且耗时较长,因此毛刺一直是许多医疗器械制造商的噩梦。Cryogenic Institute of New England Inc.公司(美国麻州,Worcester;www.nitrofreeze.com)日前推出了一种在低温下去除PEEK植入物毛刺的工艺,它不影响部件的质量或表面完整性,可帮助制造商降低成本并提高效率。

Nitrofreeze工艺能对小型部件进行批量处理,在将PEEK部件置于网篮后载入低温去毛刺系统。随后,植入物以预设的速率开始滚光,与此同时,向腔室内注入气态氮,将温度降至或接近材料的凝固点。达到预设温度后,以聚碳酸盐为介质对冷冻部件进行受控喷砂处理,然后在预定的时间段内继续滚光。

上述清洁过程可以去除毛刺,而且不会对部件的表面造成影响,因此公司将其誉为非磨损技术。“毛刺将经冷冻处理,这是由于它的体积较大;但它仅仅附着在很小的点上,介质可将其轻易地切掉,”产品营销专家Ryan Taylor解释道。“尽管部件之间会相互翻滚碰撞并且与介质摩擦,但由于部件表面为冷冻的,因此无需担心磨损效应。”

据Taylor称,与手动去毛刺相比,该工艺能显著缩短去除毛刺的时间,仅需约半个小时。“一些客户告诉我们他们采用的是手动去毛刺方法,完成每个部件需要约15分钟,可想而知,我们的工艺效率要高很多。”

可重复性是低温工艺的另一个优势。由于手动去毛刺可能由不同的人来完成,因此部件之间通常都存在差异。而Nitrofreeze工艺可以保存特定部件或部件编号的参数,这样就可以在相同条件下对不同的批次进行处理,从而保证了可重复性。

该工艺能去除复杂PEEK部件上的轻微、螺纹式和跨孔式机械毛刺,通常情况下处理部件的体积为0.025英寸,不过也曾采用此工艺处理过更小的部件。由于受部件大小的限制,因此低温工艺最适用于精密部件,包括脊椎和小关节植入物。


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