Figure 3.

(a) In vivo porcine model. Tweezers holding a 2 cm long mould of 16 Fr catheter with minced tissue particles. Skin incision in the abdominal wall down to the shivering muscle. Photograph of a microscopic slide with tissue from a cross section demonstrating the formation of a tunnel after removal of the mould. (b) (Masson's trichrome). (c) Washed-out photograph of a microscopic slide with tissue from a cross section demonstrating scoring of generated granulation tissue and number of capillaries in four different directions 90° apart, indicated by the arrows and the dotted cross section, with L indicating the lumen. The sides are marked A, B, C, and D, corresponding to the four locations in Table 1 (Masson's trichrome).