Use of fiber lasers for micro cutting applications in the medical device industry

Abstract

The medical device industry has created a big demand for laser micro machining. Flashlamp pump solid-state lasers are currently used for this application. Many of these lasers are configured to operate near the diffraction limited beam performance to maintain a very small kerf width. In order to meet yields and up-time requirements reliable laser operation and low maintenance are required. Under production conditions it is a challenge to keep such a laser system performing with the consistency required. The fiber laser concept could provide benefits in order to maintain high up-time and high yields. The single mode fiber laser does not need mirror alignment. Diode pumped fiber lasers also reduce maintenance, as flash-lamp changes are eliminated. The compact air-cooled design also helps to save expensive clean room space on the production floor. Recent improvements in average laser power now make the fiber laser suitable for industrial cutting applications. The focus for this work is therefore laser micro-cutting of stainless steel stent implants and this paper presents the first micro-cutting results in stainless steel. Kerf width and surface quality on the sidewall are of special interest. Also presented are laser operating conditions to minimize Heat Affected Zone (HAZ) in stainless steel.

Laser Beam MicroMachining (LBMM) – A review

“…Kliene et al [69] demonstrated the laser microcutting of stainless steel stent implants using single mode fiber laser. Kerf width and surface quality on the side wall was investigated and it was observed that due to its good beam quality the fiber laser produces small kerf width.…”

Application of fiber laser used in the field of stent cutting and micromachining

“…Heat affected zone expands, which directly influences the quality of stent. With the development and mature of fiber laser technologies, however, the industry begins to turn to fiber laser in medical device micro-machining 4,5,6,7 . Recent improvements in average laser power now make the fiber laser suitable for industrial cutting applications.…”

Laser ablation using a long-pulsed, high-fluence, CW single-mode fiber laser

“…The figure lists the CW output as 150 W, which is lower than the rated output, and this is explained below. Similarly, Kleine et al (Kleine et al, 2002) measured the pulse shape of a 50 W Yb-doped fiber laser and also found that for a 100 s pulse, there was a 1-2 s spike that was of 2-3 times higher power than the CW rated output.…”