Stent strength improvement through the utilization of selective laser melting technology

The invention of Metal Additive Manufacturing or known as Selective Laser Melting has opened a wide application of field such as biomedical devices, automotive and Oil & Gas, Aerospace and Consolidation of parts, and in certain area where stronger parts can be produced. Furthermore, the Sele...

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Main Author:	Omar, Mohd Asnawi
Format:	Thesis
Language:	English
Published:	2021
Subjects:	Stents (Surgery) Metal catalysts
Online Access:	http://psasir.upm.edu.my/id/eprint/103989/1/MOHD%20ASNAWI%20BIN%20OMAR%20-%20IR.pdf
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id	my-upm-ir.103989
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spelling	my-upm-ir.1039892023-07-04T03:03:35Z Stent strength improvement through the utilization of selective laser melting technology 2021-07 Omar, Mohd Asnawi The invention of Metal Additive Manufacturing or known as Selective Laser Melting has opened a wide application of field such as biomedical devices, automotive and Oil & Gas, Aerospace and Consolidation of parts, and in certain area where stronger parts can be produced. Furthermore, the Selective Laser Melting (SLM) has been known to produce new net shape and intricate design which cannot be achieved through conventional processing. In this research, the problem statement of laser cuts stent has been addressed to overcome the constraint of laser cutting by enhancing with the SLM technology. The additively manufactured stent is consisting of seven (7) type design where the purpose was manufacturability through SLM technology by utilizing the strut, diameter, height, and angle. A set of default parameter with the laser power of 200 Watt, with the hatching distance of 0.14mm, layer thickness of 0.02mm and scanning speed of 800mm/s has been applied through a series of different type of additive stent. The tolerances or shrinkage of the stent are also achieving a good result because the dimensional accuracy reaches closely to 0.5% shrinkage (±70 μm) of diameter and 0.03% (±30 μm) for the height. Result from testing method also shown that, where all seven (7) AM stents showed better performance compared with conventional stent due to the placement of strut hoops in all connectors with highest stiffness was 1.44 N/mm (in axial) and 0.75 N/mm in radial during compression load. Whereas the flexural test showed a better stiffness in the value of 0.44N/mm. The heat treatment stent was then compared with the As-built stent where there is significant increase on compression test (2.04 N/mm). While the Flexural Test showed the decrease of stiffness (0.36 N/mm), but still the acceptance rate was better compared to the commercial stent in the market. The Clinical test (Cytotoxicity test) also showed promising result where all the additively manufactured stent showed 100.3% viability cells. Stents (Surgery) Metal catalysts 2021-07 Thesis http://psasir.upm.edu.my/id/eprint/103989/ http://psasir.upm.edu.my/id/eprint/103989/1/MOHD%20ASNAWI%20BIN%20OMAR%20-%20IR.pdf text en public doctoral Universiti Putra Malaysia Stents (Surgery) Metal catalysts Baharudin, B.T Hang Tuah
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English
advisor	Baharudin, B.T Hang Tuah
topic	Stents (Surgery) Metal catalysts
spellingShingle	Stents (Surgery) Metal catalysts Omar, Mohd Asnawi Stent strength improvement through the utilization of selective laser melting technology
description	The invention of Metal Additive Manufacturing or known as Selective Laser Melting has opened a wide application of field such as biomedical devices, automotive and Oil & Gas, Aerospace and Consolidation of parts, and in certain area where stronger parts can be produced. Furthermore, the Selective Laser Melting (SLM) has been known to produce new net shape and intricate design which cannot be achieved through conventional processing. In this research, the problem statement of laser cuts stent has been addressed to overcome the constraint of laser cutting by enhancing with the SLM technology. The additively manufactured stent is consisting of seven (7) type design where the purpose was manufacturability through SLM technology by utilizing the strut, diameter, height, and angle. A set of default parameter with the laser power of 200 Watt, with the hatching distance of 0.14mm, layer thickness of 0.02mm and scanning speed of 800mm/s has been applied through a series of different type of additive stent. The tolerances or shrinkage of the stent are also achieving a good result because the dimensional accuracy reaches closely to 0.5% shrinkage (±70 μm) of diameter and 0.03% (±30 μm) for the height. Result from testing method also shown that, where all seven (7) AM stents showed better performance compared with conventional stent due to the placement of strut hoops in all connectors with highest stiffness was 1.44 N/mm (in axial) and 0.75 N/mm in radial during compression load. Whereas the flexural test showed a better stiffness in the value of 0.44N/mm. The heat treatment stent was then compared with the As-built stent where there is significant increase on compression test (2.04 N/mm). While the Flexural Test showed the decrease of stiffness (0.36 N/mm), but still the acceptance rate was better compared to the commercial stent in the market. The Clinical test (Cytotoxicity test) also showed promising result where all the additively manufactured stent showed 100.3% viability cells.
format	Thesis
qualification_level	Doctorate
author	Omar, Mohd Asnawi
author_facet	Omar, Mohd Asnawi
author_sort	Omar, Mohd Asnawi
title	Stent strength improvement through the utilization of selective laser melting technology
title_short	Stent strength improvement through the utilization of selective laser melting technology
title_full	Stent strength improvement through the utilization of selective laser melting technology
title_fullStr	Stent strength improvement through the utilization of selective laser melting technology
title_full_unstemmed	Stent strength improvement through the utilization of selective laser melting technology
title_sort	stent strength improvement through the utilization of selective laser melting technology
granting_institution	Universiti Putra Malaysia
publishDate	2021
url	http://psasir.upm.edu.my/id/eprint/103989/1/MOHD%20ASNAWI%20BIN%20OMAR%20-%20IR.pdf
_version_	1776100390808322048

Stent strength improvement through the utilization of selective laser melting technology

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