One embodiment is directed to a system for closing a wound created across a portion of a tissue structure, comprising a suture member having proximal and distal ends; an anchor member coupled to the distal end of the suture member; a tension retainer assembly releasably coupleable to the suture member; and a suture buttress movably intercoupled to the suture member between the anchor member and the tension retainer and configured to minimize direct sliding contact between the suture member and the tissue structure portion around the location of the suture buttress.