Scaling of Engineered Vascular Grafts Using 3D Printed Guides and the Ring Stacking Method

Area of Science:

• Biomedical Engineering
• Regenerative Medicine
• Vascular Tissue Engineering

Background:

• Coronary artery disease is a major cause of mortality, with limited autologous vascular graft options.
• Current engineered vascular grafts lack scalability, requiring costly and time-consuming custom mold fabrication.
• Human arteries exhibit a wide range of diameters (2.0-38 mm) and wall thicknesses (0.5-2.5 mm).

Purpose of the Study:

• To develop a scalable and cost-effective method for creating patient-specific engineered vascular grafts.
• To overcome the limitations of current custom mold-based fabrication techniques for vascular grafts.

Main Methods:

• Introduction of the "Ring Stacking Method" for fabricating tissue-engineered vascular constructs.
• Utilizing center posts and outer shells to precisely control lumen diameter and wall thickness of tissue rings.
• Stacking variable-sized tissue rings (demonstrated with vascular smooth muscle cells) to create tubular constructs of desired length.

Main Results:

• The Ring Stacking Method enables the ready manufacture of tissue rings in variable dimensions.
• Tubular constructs mimicking natural blood vessels can be readily assembled by stacking these rings.
• Vessel length is easily tailored by adjusting the number of stacked rings.

Conclusions:

• The Ring Stacking Method offers a scalable and versatile approach for producing engineered vascular grafts.
• This technique facilitates the creation of custom-sized and -length vascular tissues for clinical applications.
• The method addresses the need for readily manufacturable, patient-specific vascular grafts in treating cardiovascular diseases.