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

Schematic representation of lateral (A) and frontal view (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 (A and B). Once in position, the device is secured in place by gentle suction ports (C, white arrows) 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 and C, asterisk) through ports arrayed around fence (C, black arrows). Electrical sensors (C, arrowhead) allow precise placement over areas of electrical abnormalities, such as infarcts. See Supplemental Video 1.