Development and assessment of 316LVM cardiovascular stents

Additive manufacturing of cardiovascular CoCr stents by selective laser melting

“…The preliminary analysis on the surface finishing showed the possibility of using the conventional electropolishing method on additively manufactured stents, although the conditions should be further optimized. Heat treatments and chemical/electrochemical finishing operations are part of the conventional manufacturing of cardiovascular stents based on laser microcutting of microtubes [41][42][43]. Hence, the necessity for heat treatment and finishing steps does not necessarily induce longer manufacturing cycles.…”

New Developments on Mini/Micro Shape Memory Actuators

“…Because laser material processing is a thermal process, in which an heat source is used to remove a certain volume of material from the work piece, some thermal damages are evidently obtained, such as melted material, heat affected zone and oxides. To remove these defects, chemical etching and electro-chemical polishing have to be performed on the snake SMA samples [37,41]. Figure 17 depicts SEM images of the snake NiTi sample after laser, chemical etching and electro-chemical processes; top and bottom surfaces as well as snake sample section are shown.…”

Dross formation and process parameters analysis of fibre laser cutting of stainless steel thin sheets

“…SEM and microstructural analyses revealed a HAZ smaller than 70 µm in depth and a re-deposited layer of about 7 µm exists on the machined surface. Raval et al [16] machined a coronary stent after Nd:YAG laser cutting of 316LVM tubing and an assessment of its surface characteristics after electrochemical polishing. Finally, Scintilla et al [17] analyzed the influence of processing parameters and laser source type on cutting edge quality of AZ31 magnesium alloy sheets and differences in cutting efficiency between fiber and CO2 lasers were studied.…”