An assembly comprising: a first suture comprising a first end and a second end, the first suture folded back on itself, thus forming a first arm including the first end, a second arm including the second end, wherein the first arm is connected to the second arm via a first bridge; and a second suture comprising a first end and a second end, the second suture folded back on itself, thus forming a first arm including the first end, a second arm including the second end, wherein the first arm is connected to the second arm via a bridge; wherein the bridge of the second suture is positioned across the first arm and the second arm of the first suture, the first arm of the second suture is wrapped in a first helical configuration around the first arm of the first suture, from the bridge into the direction of the first bridge, the second arm of the second suture is wrapped in a second, oppositely wound helical configuration around the second arm of the first suture, from the bridge into the direction of the first bridge, and the first and second ends (45, 50) of the second suture are connected to one another so that the second suture forms a closed loop; wherein the assembly further comprises a second bridge connecting the first and second ends (20, 25) of the first suture, the second bridge opposing the first bridge so that the first suture has a generally O-shaped configuration forming a closed loop, so that, when holding the first and second ends (45, 50) of the second suture taut while applying oppositely directed tension to the second bridge, the assembly transforms from a longitudinally-expanded, radially-contracted first configuration, in which the second suture is wrapped loosely around the first suture, into a longitudinally-contracted, radially-expanded second configuration having a larger cross-sectional area than the first configuration. a first suture comprising a first end and a second end, the first suture folded back on itself, thus forming a first arm including the first end, a second arm including the second end, wherein the first arm is connected to the second arm via a first bridge; and a first arm including the first end, a second arm including the second end, wherein the first arm is connected to the second arm via a first bridge; and a second suture comprising a first end and a second end, the second suture folded back on itself, thus forming a first arm including the first end, a second arm including the second end, wherein the first arm is connected to the second arm via a bridge; wherein the bridge of the second suture is positioned across the first arm and the second arm of the first suture, the first arm of the second suture is wrapped in a first helical configuration around the first arm of the first suture, from the bridge into the direction of the first bridge, the second arm of the second suture is wrapped in a second, oppositely wound helical configuration around the second arm of the first suture, from the bridge into the direction of the first bridge, and the first and second ends (45, 50) of the second suture are connected to one another so that the second suture forms a closed loop; a first arm including the first end, a second arm including the second end, wherein the first arm is connected to the second arm via a bridge; wherein the bridge of the second suture is positioned across the first arm and the second arm of the first suture, the first arm of the second suture is wrapped in a first helical configuration around the first arm of the first suture, from the bridge into the direction of the first bridge, the second arm of the second suture is wrapped in a second, oppositely wound helical configuration around the second arm of the first suture, from the bridge into the direction of the first bridge, and the first and second ends (45, 50) of the second suture are connected to one another so that the second suture forms a closed loop; wherein the assembly further comprises a second bridge connecting the first and second ends (20, 25) of the first suture, the second bridge opposing the first bridge so that the first suture has a generally O-shaped configuration forming a closed loop, so that, when holding the first and second ends (45, 50) of the second suture taut while applying oppositely directed tension to the second bridge, the assembly transforms from a longitudinally-expanded, radially-contracted first configuration, in which the second suture is wrapped loosely around the first suture, into a longitudinally-contracted, radially-expanded second configuration having a larger cross-sectional area than the first configuration. a second bridge connecting the first and second ends (20, 25) of the first suture, the second bridge opposing the first bridge so that the first suture has a generally O-shaped configuration forming a closed loop, so that, when holding the first and second ends (45, 50) of the second suture taut while applying oppositely directed tension to the second bridge, the assembly transforms from a longitudinally-expanded, radially-contracted first configuration, in which the second suture is wrapped loosely around the first suture, into a longitudinally-contracted, radially-expanded second configuration having a larger cross-sectional area than the first configuration.