Figure 1: Hydrogel Delivery Device Creates a Temporary Compartment for Biomaterial Gel Delivery Within the Pericardial Space

Schematic representation of lateral <b>(A)</b> and frontal view <b>(B)</b> of the device placed over the cardiac epicardium within the pericardial space. The device forms a lateral wall for the gel compartment, whereas the pericardium and epicardium act as a natural roof and floor, respectively <b>(A and B)</b>. Once in position, the device is secured in place by gentle suction ports <b>(C, white arrows)</b> to the epicardium as floor, and the pericardium as ceiling. Gel components are delivered through separate lumens and combined only after exiting the device <b>(B and C, asterisk)</b> through ports arrayed around fence <b>(C, black arrows)</b>. Electrical sensors <b>(C, arrowhead)</b> allow precise placement over areas of electrical abnormalities, such as infarcts. See Supplemental Video 1.