The PINION™ PDO Knotless Suture consists of barbed suture material armed with a surgical needle on each end. Barbs allow for tissue approximation without the need to tie surgical knots. PINION™ PDO Knotless Suture is a sterile, synthetic, absorbable monofilament suture comprised of Poly (p- Polydioxanone). The empirical molecular formula of which is (C4H6O3)x. PINION™ PDO Knotless Sutures are available in undyed or dyed with D & C violet No.2 (21 CFR 74. 3602) at a level not exceeding 0.3 % by weight of the suture in sizes USP (EP) 5-0 (1), 4-0 (1.5), 3-0 (2), 2-0 (3), 0 (3.5), 1 (4) & 2(5) . It is supplied with the attached stainless steel surgical needles. Polydioxanone has been found to be nonantigenic, nonpyrogenic and to elicit only a slight tissue reaction during absorption. The PINION™ PDO Knotless Suture is designed with small unidirectional and idirectional barbs along the length of the device. It consists of an absorbable thread with unidirectional anchors,equipped with a surgical needle at one end and a fixation tab at the other while the bidirectional anchors equipped with a surgical needle at both end. The anchors and fixation tab design allows for tissue approximation without the need to tie surgical knots. The USP designations for diameter are applicable to the PINION™ PDO Knotless Suture material prior to barbing. After the creation of barbs, the PINION™ PDO Knotless Suture is identified as one size smaller than the non-barbed suture. This modification reduces the tensile strength of the suture similar to effect of knot tying in non-barbed suture. Therefore, the straight pull tensile strength of the PINION™ PDO Knotless Suture is comparable to the USP knot pull tensile strength for a non barbed suture of the equivalent size.