Barbed suture with concavo-convex barbs that facilitate tissue passage and increase retention strength

摘要

The wound closure device (200) includes a filamentous element (202) having a proximal end (206) and a distal end (210), and a plurality of barbs (204) extending outwardly from the filamentous element. . Each of the barbs includes a base (230) connected to the filamentous element, a tip (232) spaced from the base, and an outer edge (234) extending between the base and tip. Have. The outer edge has a first portion (242) having a concave surface extending between the base and the barb transition point (246) and a convex surface extending between the barb transition point and the barb tip. A second portion (244). The outer edge transitions from the concave surface of the first part to the convex curve of the second part at the transition point of the thorn. The tip of the thorn has a convex curve that faces the distal end of the filamentous element. The unique dual radius shape of the outer edge of the thorn and the tip of the thorn minimizes resistance when the filamentous element is pulled through the tissue in the first direction, and the filamentous element is pulled through the tissue in the opposite second direction. The resistance to movement is maximized and the wound closure device is held stationary.