Figure 7.

Graphical description of large bone repair scaffolds made in Tsinghua University, the corresponding author’s laboratory in 2007: (a) a double-nozzle low-temperature 3D bioprinter; (b) working state of the double nozzles; (c) a grid computer-aided design (CAD) model containing two material systems; (d) a sample made from chitosan/gelatin and polyurethane; (e) a sample containing both P-chitosan and S-chitosan made via the double-nozzle low-temperature 3D bioprinter; (f) a computerized tomography of the 3D printed sample of (e). Image reproduced with permission from [87].