FIGURE 9.

The in situ printing of scaffolds with a hand‐held bioprinter. (a) Schematic of cell‐laden GelMA hydrogels bio‐printed in situ. (b) A photograph of the potable 3D bioprinter that was used, which was equipped with a UV light source for in situ cross‐linking of the printed scaffolds. (c) Illustration of a standard scaffold printed on a nonflat pig skeletal muscle. (d) Photograph of a scaffold in the shape of an N. (e) Surgical implantation of GelMA hydrogels into a murine VML lesion using in situ printing. (f) Before VML surgery, after VML surgery, and after GelMA hydrogel in situ printing. Source: All pictures were reprinted with permission from reference 80