Octopus-inspired tissue adhesive patches. (a) It is hypothesized that Octopus vulgaris muscular hydrostats reversibly adhere to surfaces by compressing suction cups,causingliquidto flowtotheupperchamber,abovetheprotuberanceresultinginalowhydrostaticpressure.Avacuumiscreatedinthelowerchamber.Adapted from [14]. (b) A simplified biomimetic suction cup patch showed wet tissue adhesion to a porcine heart. Reprinted with permission from [123] Copyright 2017 American Chemical Society.