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水导激光切割技术改进支架制造工艺 - China Medical Device Manufacturer
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Fri, January 19th, 2018

2005 夏季刊 » 技术新知
水导激光切割技术改进支架制造工艺

据报道,适宜无尘室的水导激光切割技术能解决许多传统支架切割技术所困扰的难题。Synova S.A. (Ecublens,Switzer-land; www.synova.com) 所制造的LCS300激光切割系统能够使热损害最小,减少碎屑的产生,简化沉积流程以及使二级流程效率更高。

传统激光切割会造成背面热损坏并使边缘粗糙。

所谓支架,是指能自我扩张的小型不锈钢网管,置于冠状动脉中以使脉管张开。其用平板或管材切割而成,需遵照严格的制造标准以保证其安全性和兼容性。表面质量和管强度尤为重要,因为支架将被置于脉管内相当长的时间,公司CEO Bernold Richerzhagen解释道,因此,必须将支架切割过程中导致材料损坏的潜在因素遏制在最小程度。

用于切割支架的材料多为热敏型。所以尽可能减小热损害尤为重要,Richerzhagen强调。此外,支架的结构和弯曲形态错综复杂,需要快速简洁的切割,不留残渣或毛边。生物相容性也是一个关键。支架表面适当磨光使其能更易于在基层上涂覆药物洗脱涂层。

传统的激光切割流程会产生碎屑。可能还会因为加热而造成材料损坏,不得不进行后加工,如喷砂处理和化学蚀刻。据Synova公司称,若能在初始的切割步骤达到所要的质量标准,便可提高生产率,至少能减少电解抛光边缘的需要。

LCS300基于激光微射流技术,其融合了激光切割和水射流技术,使材料切割效果更出色,从而切割时更为高效而少碎屑。高能脉冲激光束与发丝细度的低压水射流结合。在水射流中,光束受气水界面的内部反射所引导。射流保证了一致的点直径并允许单厘米长度聚焦。水射流能在激光束切割金属时进行引导,冷却边缘并产生平整的切口。

该镍钛诺合金支架采用激光微射流技术进行切割。切割后无需处理。

与传统的干式激光相比,此技术有两个主要优势,Richerzhagen说道,首先,水射流能在激光脉冲间隙冷却材料,使受热影响区域减小到可忽略。其次,水射流能将切割融化的材料带走,减少了微粒污染。由于融化材料被即刻冷却,因此不会吸附到材料表面。

LCS300为硬质结构,采用线性马达来进行高精度、高速度、清洁可靠的切割、钻孔、开槽、标记、画线或切块操作。其加工范围为300mm300mm,最大轴速1000mm/s。还可配备直接驱动的转轴,便于管材加工,其精度误差3m,定位精度高。该系统配有CCD数码相机和软件,可快速自动对齐和检测。用户界面为一块15英寸的彩色平板触摸屏。运用此设备还能进行复杂的3D切割。


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