A suture fastener (32, 92, 132) for fastening one or more sutures, the suture fastener (32, 92, 132) shaped so as to define: a spiral portion; and a radially-inward portion that is disposed radially inward from the spiral portion, wherein the suture fastener (32, 92, 132), when in a resting state, has an unlocked conical helical configuration (50, 150), in which the spiral portion is conically helical, wherein the suture fastener (32, 92, 132) is configured, when one or more portions of the one or more sutures pass through respective portions of the suture fastener (32, 92, 132), to transition from the unlocked conical helical configuration (50, 150) to a planar spiral configuration, in which the spiral portion is planar spiral and the one or more sutures are coupled to the suture fastener (32, 92, 132), wherein the radially-inward portion is neither helical nor spiral, both when the suture fastener (32, 92, 132) is in the unlocked conical helical configuration (50, 150) and when the suture fastener (32, 92, 132) is in the planar spiral configuration, and wherein the planar spiral configuration is a locked planar spiral configuration (52, 152), characterised in that the suture fastener (32, 92, 132) is configured to be axially plastically deformed, when the one or more portions of the one or more sutures pass through the respective portions of the suture fastener (32, 92, 132), and to thereby transition from the unlocked conical helical configuration (50, 150) to the locked planar spiral configuration (52, 152), in which the spiral portion is planar spiral and the one or more sutures are fixedly coupled to the suture fastener (32, 92, 132). a spiral portion; and a radially-inward portion that is disposed radially inward from the spiral portion, wherein the suture fastener (32, 92, 132), when in a resting state, has an unlocked conical helical configuration (50, 150), in which the spiral portion is conically helical, wherein the suture fastener (32, 92, 132) is configured, when one or more portions of the one or more sutures pass through respective portions of the suture fastener (32, 92, 132), to transition from the unlocked conical helical configuration (50, 150) to a planar spiral configuration, in which the spiral portion is planar spiral and the one or more sutures are coupled to the suture fastener (32, 92, 132), wherein the radially-inward portion is neither helical nor spiral, both when the suture fastener (32, 92, 132) is in the unlocked conical helical configuration (50, 150) and when the suture fastener (32, 92, 132) is in the planar spiral configuration, and wherein the planar spiral configuration is a locked planar spiral configuration (52, 152), characterised in that the suture fastener (32, 92, 132) is configured to be axially plastically deformed, when the one or more portions of the one or more sutures pass through the respective portions of the suture fastener (32, 92, 132), and to thereby transition from the unlocked conical helical configuration (50, 150) to the locked planar spiral configuration (52, 152), in which the spiral portion is planar spiral and the one or more sutures are fixedly coupled to the suture fastener (32, 92, 132).