Manufacturing of Microparts for medical and Dental Use by Plastic working

先进医疗和新型医疗器械的发展是值得期待的。以镍钛形状记忆合金、钛和不锈钢为材料，研究了导管、支架、针头、微螺钉、微弹簧和正畸丝等医疗和牙科用微部件的塑料加工。(1)研究了直径小于等于1mm的医用支架用细管的最佳生产工艺设计和拉伸条件。使用铜或钛线芯轴拉伸芯轴是有效的，并且可以制造用于支架的超细管。提出了一种新型的液体抽芯法。(2)对拉深时的缩径和模角进行了优化，使我们能够制作直径为100 μm的微方丝，从而可以制作微弹簧。(3)利用所获得的钛镁合金拉丝，可以制备M0.8微螺杆。

The development of advanced medical treatment and new medical instrument is expected. Using Ni-Ti shape memory alloy, titanium and stainless steel, we study the fabrication of micro-parts for medical and dental use such as catheters, stents, needles, micro-screw, micro-spring and orthodontics wire by plastic working.(1) The optimal production-process design and drawing conditions for fabrication of fine tubes for medical stents with a diameter of 1mm or less were examined. Mandrel drawing using a copper or titanium wire mandrel is effective and enable fabrication of ultrafine tubes for stents. Also we proposed the new mandrel drawing with the liquid.(2) Optimization for reduction and die angle in drawing was performed, which enable us to fabricate micro square wire in which diameter is 100 μm, it was possible to make the micro spring.(3) The fabrication of an M0.8 microscrew was possible using the drawn titanium and magnesium alloy wire obtained.