The present invention relates to an assembly for reducing the cross-sectional area of and/or closing an aperture in a wall of tissue, the assembly comprising: a tissue engaging portion including a plurality of hook shaped tissue engaging members configured to engage the tissue at a plurality of discrete locations around the aperture, the tissue engaging portion having a first configuration and a second configuration, wherein the tissue engaging members are spaced farther apart from each other when the tissue engaging portion is in the first configuration than when the tissue engaging portion is in the second configuration； and an elongate portion coupled to the tissue engaging portion, wherein the elongate portion is configured to move the tissue engaging portion from the first configuration to the second configuration upon application of a pulling force on the elongate portion.
