The use of single point incremental forming for customized implants of unicondylar knee arthroplasty: a review

Abstract Introduction The implantable devices are having enormous market. These products are basically made by traditional manufacturing process, but for the custom-made implants Incremental Sheet Forming is a paramount alternative. Single Point Incremental Forming (SPIF) is a manufacturing process to form intricate, asymmetrical components. It forms the component using stretching and bending by maintaining materials crystal structure. SPIF process can be performed using conventional Computer Numerical Control (CNC) milling machine. Review This review paper elaborates the various manufacturing processes carried on various biocompatible metallic and nonmetallic customised implantable devices. Conclusion Ti-6Al-4V alloy is broadly used for biomedical implants, but in this alloy, Vanadium is toxic so this alloy is not compatible for implants. The attention of researchers is towards the non toxic and suitable biocompatible materials. For this reason, a novel approach was developed in order to enhance the mechanical properties of this material. . The development of incremental forming technique can improve the formability of existing alloys and may meet the current strict requirements for performance of dies and punches.

摘要 引言 可植入设备（Implantable devices）拥有庞大的市场规模。这类产品大多采用传统制造工艺生产，但对于定制化植入物而言，增量板材成形（Incremental Sheet Forming）是至关重要的替代方案。单点增量成形（Single Point Incremental Forming，SPIF）是一种用于制造复杂异形构件的加工工艺，通过拉伸与弯曲成形的方式，在维持材料晶体结构的前提下完成构件加工。该工艺可依托常规计算机数控（Computer Numerical Control，CNC）铣床开展。

综述 本综述详细阐述了针对各类定制化生物相容性金属与非金属可植入设备所采用的多种制造工艺。

结论 Ti-6Al-4V合金（Ti-6Al-4V alloy）是生物医学植入物的常用材料，但该合金中的钒元素具有毒性，因此不适用于植入物制造。当前研究者的关注点已转向无毒且具备适宜生物相容性的材料。为此，学界开发了一种新型方法以改善该类材料的力学性能。增量成形技术的发展可提升现有合金的成形性能，有望满足当前对模具与冲头性能的严苛要求。