Micromachining NiTi tubes for use in medical devices by using a femtosecond laser

Chia Hung Hung, Fuh Yu Chang, Tien-Li Chang, Yu Ting Chang, Kai Wen Huang, Po Chin Liang

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Recent growth in medical device technology has been substantially driven by developments in laser micromachining, which is a powerful fabrication technique in which nickel-titanium (Nitinol, NiTi) alloy materials that exhibit superelastic and shape memory properties are formed (e.g., self-expanding stents). In this study a NiTi tube curve surface process is proposed, involving a femtosecond laser process and a galvano-mirror scanner. The diameter of the NiTi tube was 5.116 mm, its thickness was 0.234 mm, and its length was 100 mm. The results indicated that during the machine process the ablation mechanism of the NiTi tubes was changed by altering the machining path. The path alteration enhanced the laser ablation rate from 12.3 to 26.7 μm/J. Thus the path alteration contributed to a wide kerf line, enabling the assisted air to efficiently remove the debris deposited at the bottom of the kerf during the laser ablation process. The results indicated that the NiTi tube curve process enhanced the laser ablation rate by two times and reduced the amount of energy accumulated within the materials by 50% or more. By altering the machining path using the scanning system, this process can decrease the production of heat affected zones (the accumulation of thermal energy) in medical device applications.

Original languageEnglish
Pages (from-to)34-40
Number of pages7
JournalOptics and Lasers in Engineering
Volume66
DOIs
Publication statusPublished - 2015 Jan 1

Fingerprint

Micromachining
Laser ablation
micromachining
Ultrashort pulses
tubes
laser ablation
Machining
machining
lasers
nitinol alloys
Stents
Nickel alloys
Heat affected zone
Ablation
Thermal energy
Shape memory effect
Titanium alloys
Debris
laser machining
heat affected zone

Keywords

  • Energy accumulation
  • Femtosecond laser
  • Galvano-mirror scanner
  • NiTi

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Mechanical Engineering
  • Electrical and Electronic Engineering

Cite this

Micromachining NiTi tubes for use in medical devices by using a femtosecond laser. / Hung, Chia Hung; Chang, Fuh Yu; Chang, Tien-Li; Chang, Yu Ting; Huang, Kai Wen; Liang, Po Chin.

In: Optics and Lasers in Engineering, Vol. 66, 01.01.2015, p. 34-40.

Research output: Contribution to journalArticle

Hung, Chia Hung ; Chang, Fuh Yu ; Chang, Tien-Li ; Chang, Yu Ting ; Huang, Kai Wen ; Liang, Po Chin. / Micromachining NiTi tubes for use in medical devices by using a femtosecond laser. In: Optics and Lasers in Engineering. 2015 ; Vol. 66. pp. 34-40.
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