Using inverse replica fixture technique for improving nano-finishing of hip joint implant in abrasive flow finishing process

Choopani, Yahya; Khajehzadeh, Mohsen; Razfar, Mohammad Reza

doi:10.1007/s00170-020-06064-5

Cited by 7 publications

(1 citation statement)

References 27 publications

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“…Hitomi et al [34] established an effective surface finishing process for reducing the surface roughness of Co-Cr alloy femoral knee components by the MAF process. Yahya et al [35] used the abrasive flow finishing process for reducing the surface roughness of hip joint implants, such as the SS 316L femoral head product, using the antithesis replica fixture procedure. Satish et al [36] developed the nano-finishing of a freeform surface component by a rotational-magnetorheological abrasive flow finishing (R-MRAFF) process to polish a hip joint implant.…”

Section: Introductionmentioning

confidence: 99%

Nanoscale Polishing Technique of Biomedical Grade NiTi Wire by Advanced MAF Process: Relationship between Surface Roughness and Bacterial Adhesion

Jang

Suh

Heng

2023

JFB

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Nitinol (NiTi), an alloy of nickel and titanium, wires are an important biomedical material that has been used in catheter tubes, guidewires, stents, and other surgical instruments. As such wires are temporarily or permanently inserted inside the human body, their surfaces need to be smoothed and cleaned in order to prevent wear, friction, and adhesion of bacteria. In this study, NiTi wire samples of micro-scale diameters (i.e., Ø 200 μm and Ø 400 μm) were polished by an advanced magnetic abrasive finishing (MAF) process using a nanoscale polishing method. Furthermore, bacterial adhesion (i.e., Escherichia coli (E. coli), and Staphylococcus aureus (S. aureus)) to the initial and final surfaces of NiTi wires were investigated and compared in order to assess the impact of surface roughness on bacterial adhesion to the surfaces of NiTi wires. The finding revealed that the surfaces of NiTi wires were clean and smooth with a lack of particle impurities and toxic components on the final surface polished using the advanced MAF process. The surface roughness Ra values of the Ø 200 μm and Ø 400 μm NiTi wires were smoothly enhanced to 20 nm and 30 nm from the 140 nm and 280 nm initial surface roughness values. Importantly, polishing the surfaces of a biomedical material such as NiTi wire to nano-level roughness can significantly reduce bacterial adhesion on the surface by more than 83.48% in the case of S. aureus, while in the case of E. coli was more than 70.67%.

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Section: Introductionmentioning

confidence: 99%

Nanoscale Polishing Technique of Biomedical Grade NiTi Wire by Advanced MAF Process: Relationship between Surface Roughness and Bacterial Adhesion

Jang

Suh

Heng

2023

JFB

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Novel polishing media based on fiber for finishing hip joint implants

Choopani

Khajehzadeh

Razfar

2021

Int J Adv Manuf Technol

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Self-optimizing process planning of multi-step polishing processes

Denkena¹,

Dittrich²,

Nguyen³

et al. 2021

Prod. Eng. Res. Devel.

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Self-optimizing process planning is an essential approach for finding optimum process parameters and reducing ramp-up times in machining processes. For this purpose, polishing is presented as an application example. In conventional polishing processes, the process parameters are selected according to the operator’s expertise in order to achieve a high-quality surface in the final production step. By implementing machine learning (ML) models in process planning, a correlation between process parameter and measured surface quality is generated. The application of this knowledge automates the selection of optimal process parameters in computer-aided manufacturing (CAM) and enables a continuous adaptation of the NC-code to changing process conditions. Applying the presented ML-model, the prediction accuracy of 83% will adapt the process parameters to achieve the target roughness of 0.2 μm. The sample efficiency is shown by the decrease in root mean square error from 0.1–0.28 to 0.02–0.07 μm with additional polishing iterations.

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Using inverse replica fixture technique for improving nano-finishing of hip joint implant in abrasive flow finishing process

Cited by 7 publications

References 27 publications

Nanoscale Polishing Technique of Biomedical Grade NiTi Wire by Advanced MAF Process: Relationship between Surface Roughness and Bacterial Adhesion

Nanoscale Polishing Technique of Biomedical Grade NiTi Wire by Advanced MAF Process: Relationship between Surface Roughness and Bacterial Adhesion

Novel polishing media based on fiber for finishing hip joint implants

Self-optimizing process planning of multi-step polishing processes

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