New technology enables the manufacture of materials that mimic the structure of living blood vessels

 https://medicalxpress.com/news/2022-10-technology-enables-materials-mimic-blood.html

"concentric elastin rings develop naturally within walls implanted tubes... new manufacturing process swift and well-defined... elegant because they are manufactured from just two naturally occurring materials that are well-tolerated by the body... Tropoelastin (the natural building block for elastin) is packaged in an elastic sheath which dissipates gradually and promotes the formation of highly organized, natural mimics of functioning blood vessels... sterile plastic bag until transplantation"