The ornamental design for a double strand twistbi-directional barb suture with single coating shield, as shown and described.
FIG. 1 is a side elevation view of a double strand twist bi-directional barb suture with single coating shield in according with the invention, in a first condition of use, with the strands having a clear coating, with all other side views are substantially the same, as based on the repeating pattern of the barb;
FIG. 2 is a perspective view thereof;
FIG. 3 is a cross-section view thereof taken along line 3-3, the bottom view being a mirror image thereof; and,
FIG. 4 is a cross-section view of the double strand twist bi-directional barb suture with single coating shield taken along line 3-3 in a second condition of use, with the coating dissolved, the bottom view being a mirror image thereof.