Development of a Novel Biodegradable Metallic Stent Based on Microgalvanic Effect

Area of Science:

• Biomaterials Engineering
• Cardiovascular Research
• Materials Science

Background:

• Biodegradable stents offer promise for treating obstructive coronary artery disease but face limitations.
• Current biodegradable stents lack the ideal balance of mechanical strength, controlled degradation, and biocompatibility.
• Permanent metallic stents remain the standard due to limitations in current biodegradable options.

Purpose of the Study:

• To develop a novel biodegradable stent with tunable mechanical properties and degradation rates.
• To address the limitations of existing biodegradable stents for cardiovascular applications.
• To create a new stent material combining iron and stainless steel 316L for enhanced performance.

Main Methods:

• Utilized cold gas-dynamic spraying to create a metal structure with reduced grain size.
• Fabricated flat specimens of iron and stainless steel 316L in various compositions for testing.
• Employed femto laser techniques to manufacture stents with 80% iron and 20% stainless steel 316L.
• Conducted in vitro static and dynamic corrosion tests to evaluate degradation behavior.

Main Results:

• Developed a novel iron-stainless steel 316L amalgamate with enhanced mechanical strength.
• Demonstrated a controllable degradation rate in the amalgamate due to microgalvanic reactions.
• Showcased that corrosion rates can be adjusted by varying the iron and stainless steel 316L composition.
• Successfully fabricated stents using femto laser techniques from the novel amalgamate.

Conclusions:

• The novel manufacturing process and material composition offer a promising biodegradable stent solution.
• Tunable degradation rates are achievable by adjusting the iron and stainless steel 316L ratio.
• This approach has the potential to overcome limitations of current biodegradable stents in obstructive coronary artery disease treatment.