Figure 7.

Summary of the sensors’ histological evaluation. Sensors were recovered from the animals at the conclusion of the study and stained with hematoxylin and eosin to evaluate the foreign body response. No elevated immune cell levels can be found within or around the implanted hydrogel, indicating that there is no detectable chronic inflammatory response to the insertable sensors. Hydrogels can be seen under different stages of degradation and cellular infiltration, as the implants are gradually broken down and removed from the body via phagocytosis, with no obvious effects on the local tissue.