Laser microcutting of sheet metal for prototyping expandable stent-like structures in permanent and biodegradable alloys

Catalano, Guendalina; Demir, Ali Gökhan; Furlan, Valentina; Previtali, Barbara

doi:10.1109/rtsi.2017.8065982

Cited by 3 publications

(3 citation statements)

References 18 publications

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“…The expansion stage also serves as a function mechanical test both for the alloy type, which can be carried out as a comparative manner at this exploratory stage. Due to its very poor mechanical properties, pure Zn prototypes did not withstand the deployment stage, whereas the same mesh has been proven to function on AISI 316L and AZ31 [40].…”

Section: Prototyping Of Flat Stentsmentioning

confidence: 99%

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Prototyping of biodegradable flat stents in pure zinc by laser microcutting and chemical etching

Catalano

Demir

Furlan

et al. 2018

J. Micromech. Microeng.

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Cardiovascular stents are biomedical devices, which restore normal blood flow in the case of coronary artery obstructions. Biodegradable metals provide the possibility of a less-invasive treatment, where the stent is dissolved in body fluids after the remodelling of the artery. Compared to Mg-and Fe-alloys, Zn and its alloys provide optimal corrosion rates as a more recent option. New Zn-alloys are under development and often need to be tested for corrosion and biological properties. However, Zn and its alloys still require further investigation in terms of the production routes involved for the stent manufacturing. Especially at a prototyping stage, extrusion of thin biodegradable tubes is an expensive and difficult process. This work investigates a novel manufacturing route consisting in laser microcutting and chemical etching of pure Zn sheets to develop inflatable devices that can take a tubular form. Initially, laser microcutting parameters were studied to understand the dross formation on a low melting point material. Chemical etching of the material with low corrosion resistance was investigated for the dross removal. Prototype flat stents were produced and expanded using a medical catheter.

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Section: Prototyping Of Flat Stentsmentioning

confidence: 99%

“…Due to its very poor mechanical properties, pure Zn prototypes did not withstand the deployment stage as strut rupture was observed. On the other hand, the same mesh has been proven to function on AISI 316L and AZ31 [40].…”

Section: Prototyping Of Flat Stentsmentioning

confidence: 99%

Prototyping of biodegradable flat stents in pure zinc by laser microcutting and chemical etching

Catalano

Demir

Furlan

et al. 2018

J. Micromech. Microeng.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The use of flat sheet precursors instead of tubular ones can be combined with convectional laser cutting to produce inflatable stent meshes. Such manufacturing routes can be highly advantageous for testing new Mg-alloys combined with more realistic geometries [85]. Additive manufacturing (AM) techniques, especially selective laser melting (SLM), have raised significant attention for producing biodegradrable implants [86].…”

Section: New Strategies To Improve Mg Performancementioning

confidence: 99%