Bioprinting vascularised tissue involves using a combination of living cells and biocompatible materials to create three-dimensional structures that include blood vessel networks. These vessels are necessary for the survival of thicker tissues by providing nutrients and removing waste products.
The main challenge in creating thick engineered tissues is ensuring they receive adequate nutrients and oxygenation. Vascularisation addresses this by integrating functional blood vessel networks within the printed tissue, enabling it to grow larger without necrosis (tissue death).
Cells and sacrificial inks (biomaterials) are co-printed layer by layer, forming a structure with channels. After printing, the sacrificial material is removed through a flushing process, leaving behind hollow channels that can be filled with blood vessels to create perfusable tissue structures.
Manufacturing involves precise control over cell placement and material deposition using bioprinters. The process requires a sterile environment and careful calibration of printing parameters.
The build process includes designing the tissue structure, selecting appropriate cells and biomaterials, preparing the bio-ink, printing the layers, and post-processing steps such as removing sacrificial materials and culturing the printed tissues.
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