For biomedical devices, cardiovascular stents in particular, the employed material plays a crucial role in controlling the mechanical and biological behavior. However, the material properties are directly influenced by the production route and the stent geometry. Conventional stent manufacturing route consists of laser microcutting of microtubes. Microtube extrusion and drawing are both costly and time consuming at a prototyping level. Instead, sheet material can be obtained relatively easier using non-dedicated tooling. This work, proposes the use of laser microcutting of thin sheets for producing mesh structures that can be expanded in a tubular form with the aim of assessing processability and expandability. AISI 316L stainless steel and AZ31 Mg alloy are studied representing the well-established permanent stent material and a candidate biodegradable alloy. Surface finishing is carried out with chemical etching. A conventional balloon catheter is used for comparative expandability tests.

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

Catalano, Guendalina;Demir, Ali Gokhan;Furlan, Valentina;Previtali, Barbara
2017-01-01

Abstract

For biomedical devices, cardiovascular stents in particular, the employed material plays a crucial role in controlling the mechanical and biological behavior. However, the material properties are directly influenced by the production route and the stent geometry. Conventional stent manufacturing route consists of laser microcutting of microtubes. Microtube extrusion and drawing are both costly and time consuming at a prototyping level. Instead, sheet material can be obtained relatively easier using non-dedicated tooling. This work, proposes the use of laser microcutting of thin sheets for producing mesh structures that can be expanded in a tubular form with the aim of assessing processability and expandability. AISI 316L stainless steel and AZ31 Mg alloy are studied representing the well-established permanent stent material and a candidate biodegradable alloy. Surface finishing is carried out with chemical etching. A conventional balloon catheter is used for comparative expandability tests.
2017
Conference Proceedings of RTSI 2017 - IEEE 3rd International Forum on Research and Technologies for Society and Industry
9781538639061
biomedical device; laser microcutting; Mg alloy; micro manufacturing; rapid prototyping; stainless steel; Computer Networks and Communications; Computer Science Applications1707 Computer Vision and Pattern Recognition; Energy Engineering and Power Technology; Industrial and Manufacturing Engineering; Health (social science); Management of Technology and Innovation; Artificial Intelligence
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/1044036
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