REDESIGN AND FABRICATION OF STENT DESIGNS PRODUCED BY COMMON METHODS BY OPTIMIZING FOR MELT ELECTRO WRITING (MEW) METHOD

Year 2024, Volume: 8 Issue: 3, 337 - 351, 30.12.2024

Fatih Köse , Alper Tezcan

https://doi.org/10.46519/ij3dptdi.1536130

Abstract

The main discussion is about the differences compared to other methods. The aim is to observe the advantages and disadvantages of the stent produced using the MEW manufacturing technique and to apply the production principles. This study presents the design of a mesh-patterned stent and details the production stages using a Mew manufacturing method. Melt Electro Writing (MEW) method is a 3D writing method that is progressing and developing day by day with its use in many fields from industry to medicine. With this method, semi-flexible structures can be produced with rigid polymers. Polycaprolactone (PCL) material is preferred due to its low melting temperature and degradable structurein this production technique based on electrohydrodynamic principles to produce highly efficient, micron fibers . New methods and solutions are emerging in line with the studies carried out in this field. Stents made of nitinol are the most commonly used stents. Nitinol stents cannot be removed again as a result of placement. For this reason, various difficulties may occur in cases of recurrent blockage in the same area. It is also disadvantageous in terms of material and production costs. In the ongoing studies, it is observed that the focus is on stents that can be absorbed by the body and perform mineral supplementation. Biodegradable stents provide absorption by melting in the vessel. In this study, a stent with a grid pattern design made of Polycaprolactone (PCL) material was produced with a melt electro writing device with a rotary table. The comparison of the 316L metal stent produced by conventional production methods with the same dimensions and designs and the stent produced by MEW method from PCL material is explained by simulation and analyses, and it is shown in which cases it is more efficient and in which cases it is dysfunctional. It has been shown that stents produced with polycaprolactone (PCL) in MEW method are more efficient in terms of flexibility, biocompatibility and biodegradability than 316L metal stents produced by conventional methods. While PCL stents are suitable for short-term applications with their flexibility and biocompatibility advantages, 316L stainless steel stents can be preferred for situations requiring long-term performance and mechanical durability. The specific advantages and disadvantages of both materials are important points to be considered during stent selection. In addition to the modification and improvement of PCL materials, it has been observed that design is one of the most important factors in stent efficiency, and future studies can contribute to the development of stents that provide better performance, especially by focusing on the ability and technology of MEW devices to produce every design based on design-oriented production.

Keywords

Melt Electro Writing, Cardiovascular Stent, Cardiovascular Stent Manufacturing Techniques, Cardiovascular Stent Production with Melt Electro Writing Method.

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