Precision innovation of laser cutting machine in heart stent manufacturing

(Click 413 )

As the core device of cardiovascular interventional treatment, the structural accuracy and material integrity of heart stents are directly related to the success rate of surgery and the long-term prognosis of patients. Traditional processing methods are difficult to meet the needs of ultra-fine cutting, and laser cutting technology has become the core process for the manufacture of stents such as nickel-titanium alloys and cobalt-chromium alloys with its micron-level accuracy and heat impact control capabilities, promoting cardiovascular interventional treatment to a safer and more personalized direction.

Heart stents need to cut a complex mesh structure on metal pipes with a diameter of 2-4mm. Traditional processes are prone to uneven wire diameters or fractures at the connection points. The laser cutting machine achieves a cutting accuracy of ±5μm through a 30μm-level spot and a nanopositioning system to ensure uniform distribution of the radial support force of the stent.

 

 

The shape memory effect and superelasticity of nickel-titanium alloys are susceptible to thermal damage. The extremely short pulses of picosecond/femtosecond lasers produce almost no heat-affected zone, avoiding the temperature deviation of the material phase change. After testing, the fatigue life of laser-cut stents is more than 3 times higher than that of traditional EDM, meeting the requirements of more than 10 years of in vivo service.

The new generation of degradable stents (such as polylactic acid and magnesium alloy) need to take into account both support force and degradation rate control. The laser cutting machine uses three-dimensional dynamic focusing technology to simultaneously complete the integrated processing of the main grid and drug-carrying micropores on a single tube, with an aperture accuracy of ±2μm, to achieve precise matching of drug controlled release and structural degradation.

Laser cutting technology has redefined the manufacturing standards of heart stents with its “zero stress, ultra-precision” characteristics. The deep integration of femtosecond laser and biomechanics provides a more accurate and lasting solution for the treatment of cardiovascular diseases.