There are many different models for wound healing. One that has been used widely in vitro is looking at contraction of a collagen gel by fibroblasts over time. To this different subsets of cells could be added. See Li et al., 2014 PLOS one
N3D Biosciences Inc. has developed BiO Assay, to screen compounds for wound healing. For your convenience I have attached their most recent scientific publication related to this particular product. Hope this information serves you well, have a wonderful day!