3D Printing for Bio-Synthetic Biliary Stents

Area of Science:

• Biomaterials Engineering
• Regenerative Medicine
• Medical Device Innovation

Background:

• Three-dimensional (3D) printing offers advanced capabilities for creating patient-specific medical devices.
• Bile duct obstructions necessitate innovative stent solutions for improved patient outcomes.

Purpose of the Study:

• To validate a novel biofabrication method for creating customized, living biliary stents.
• To assess the feasibility of using crosslinked polyvinyl alcohol (XL-PVA) combined with stem cells and cholangiocytes for stent development.

Main Methods:

• Utilized 3D printing and collagen injection molding for rapid prototyping of XL-PVA stents.
• Infused stents with collagen, human placental mesenchymal stem cells (PMSCs), and cholangiocytes.
• Evaluated stent properties including hydrophilic swelling, radiographic opacity, and cell coating viability.

Main Results:

• XL-PVA stents exhibited hydrophilic swelling, with radiocontrast enhancing radiographic visibility.
• Collagen loaded with PMSCs demonstrated significant contraction around the stents.
• Histology and fluorescence microscopy confirmed dense cholangiocyte coatings on the stent matrix.

Conclusions:

• The developed biofabrication technique successfully created personalized, living biliary stents.
• Design elements may facilitate stent placement, protect the cell matrix, and reduce biofilm formation.
• This approach establishes a foundation for patient-specific bio-integrating stent fabrication in biliary procedures.