Synthesis and Characterization of Biodegradable Polyurethane for Hypopharyngeal Tissue Engineering

Figure 9

Appearance of subcutaneously implanted cPU membrane in the back of SD rats for 7 d (a1), 21 d (b1), 49 d (c1), and 70 d (d1); arrow indicates the location of the material. (b2) H&E staining of microtome section after 21 d implantation; white triangle and arrow indicate the site filled with inflammatory cells. (d2) H&E staining of microtome section after 70 d implantation. Arrow indicates the biodegraded fragment. Scale bar 100 μm.