Past and Recent Progress on Metallic Digestive Tract Stents

Area of Science:

• Biomaterials Engineering
• Gastroenterology
• Medical Device Development

Background:

• Digestive tract stents offer a minimally invasive treatment for various gastrointestinal diseases.
• Metallic stents are favored for their mechanical properties and efficacy in improving patency.
• Current research focuses on both non-biodegradable and novel biodegradable metallic stent designs.

Purpose of the Study:

• To review the design and development of metallic digestive tract stents.
• To compare conventional non-biodegradable and biodegradable metallic stent materials.
• To evaluate the advantages, disadvantages, and future challenges of metallic digestive stents.

Main Methods:

• Literature review of existing research on metallic digestive tract stents.
• Analysis of stent materials including nitinol, stainless steel, cobalt-based, magnesium-based, iron-based, and zinc-based alloys.
• Evaluation of mechanical properties, biocompatibility, and clinical performance.

Main Results:

• Non-biodegradable metallic stents (nitinol, stainless steel, cobalt-based alloys) offer robust mechanical support.
• Biodegradable metallic stents (magnesium, iron, zinc alloys) show potential for temporary support and reduced long-term complications.
• Each material type presents unique advantages and disadvantages regarding strength, degradation rate, and biocompatibility.

Conclusions:

• Metallic stents are crucial for managing digestive tract obstructions.
• Biodegradable metallic stents represent a promising advancement, requiring further research for clinical translation.
• Future directions include optimizing material properties and exploring novel applications for metallic digestive tract stents.