A rupture sealing device including an anchor mechanism for being disposed through the rupture of a container and for interacting with an inside wall of the container in proximity to the rupture. Contrast cutters substantially shaped like circular sectors are hinged to the internal wall of the container by means of their respective vertices in a vertical arrangement in substantially radial positions and can be inserted and removed through appropriately provided slots. The metallic buffer layer is disposed on the substrate and covers the bowl-shaped structure. If the user changes the user interface window to include portions of the electronic document that previously had not been in view, the viewable document section then changes to include this new, previously unseen portion. The knife assembly includes a knife blade and an actuation shaft.