Hybrid manufacturing and performance evaluation of β Ti-alloy stents

IF 7.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials & Design Pub Date : 2024-11-01 DOI:10.1016/j.matdes.2024.113420

Peter Ibrahim , Rebecca Garrard , Pavel Penchev , Kenny Man , Sophie C. Cox , Stefan Dimov , Moataz M. Attallah

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Abstract

Biomedical β Ti-alloys possess an interesting combination of mechanical properties, including an elastic modulus lower than 60 GPa. In this study, a hybrid manufacturing route for Ti-34Nb-13Ta-5Zr-0.3O (TNTZO) alloy stents was developed and assessed. The route involves using Laser Powder Bed Fusion (L-PBF) to manufacture thin-walled tubes, which are then laser micro-machined to directly produce customised stents, cutting short the laborious process and overcome the design limitations for stents manufacturing. Different post processing techniques were used to improve the surface finish and cell attachment properties of the tubes. Finite Element (FE) modelling was used to simulate stent crimping and deployment. The study identified the key parameters that control the performance of the final product, including the optimum laser scanning strategies during L-PBF to achieve smooth thin-walled tubes, and the use of electropolishing to improve the surface finish and cell attachment. FE simulations showed that TNTZO can achieve crimping ranges up to 74% following the optimisation of the strut diameter, which brings us one step closer to a Ni-free alternative to nitinol in manufacturing stents that require significant deformation.

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β钛合金支架的混合制造和性能评估

生物医学 β Ti-合金具有有趣的机械性能组合，包括低于 60 GPa 的弹性模量。本研究开发并评估了 Ti-34Nb-13Ta-5Zr-0.3O (TNTZO) 合金支架的混合制造工艺。该工艺包括使用激光粉末床熔融（L-PBF）制造薄壁管，然后通过激光微加工直接生产定制支架，缩短了费力的工艺流程，克服了支架制造的设计限制。不同的后处理技术可改善管材的表面光洁度和细胞附着特性。有限元（FE）建模用于模拟支架的卷曲和展开。研究确定了控制最终产品性能的关键参数，包括在 L-PBF 过程中实现光滑薄壁管的最佳激光扫描策略，以及使用电抛光来改善表面光洁度和细胞附着性。FE 模拟显示，在优化支杆直径后，TNTZO 的压接范围可达 74%，这使我们在制造需要显著变形的支架时，离无镍替代品镍钛诺更近了一步。

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来源期刊

Materials & Design Engineering-Mechanical Engineering

CiteScore

14.30

自引率

7.10%

发文量

1028

审稿时长

85 days

期刊介绍： Materials and Design is a multi-disciplinary journal that publishes original research reports, review articles, and express communications. The journal focuses on studying the structure and properties of inorganic and organic materials, advancements in synthesis, processing, characterization, and testing, the design of materials and engineering systems, and their applications in technology. It aims to bring together various aspects of materials science, engineering, physics, and chemistry. The journal explores themes ranging from materials to design and aims to reveal the connections between natural and artificial materials, as well as experiment and modeling. Manuscripts submitted to Materials and Design should contain elements of discovery and surprise, as they often contribute new insights into the architecture and function of matter.