Dang M C, Thacker J G, Hwang J C, Rodeheaver G T, Melton S M, Edlich R F
Department of Plastic Surgery, University of Virginia School of Medicine, Charlottesville 22908.
Arch Surg. 1990 May;125(5):647-50. doi: 10.1001/archsurg.1990.01410170095020.
The biomechanical performance of polytetrafluoroethylene (PTFE) sutures has been compared with that of polypropylene sutures, the standard to which other sutures used in vascular and cardiac surgery are compared. The PTFE is supple and has no plastic memory, while the polypropylene suture is stiff and retains its plastic memory. In addition, the rate of creep encountered in the PTFE suture was significantly less than that of the polypropylene suture. The knotting profiles for knot security for either a square, granny, or surgeon's knot for polypropylene sutures were three throws each. In contrast, knot security with either a square or granny PTFE knot was accomplished with seven throws; six throws were needed for a secure surgeon's knot. The breaking strength of the unknotted and knotted PTFE sutures was approximately one half as great as that for the unknotted and knotted polypropylene sutures. Knot construction significantly reduced the breaking strength of polypropylene sutures but did not alter the breaking strength of PTFE sutures. The percent elongation experienced by both sutures before breakage did not differ significantly. The elasticity, as measured by work recovery, for the polypropylene suture was greater than that for the PTFE suture. On the basis of its unique biomechanical performance characteristics, the PTFE suture should have an important place in vascular and cardiac surgery.
聚四氟乙烯（PTFE）缝线的生物力学性能已与聚丙烯缝线进行了比较，聚丙烯缝线是血管和心脏手术中用于与其他缝线作比较的标准。PTFE缝线柔软且无塑性记忆，而聚丙烯缝线坚硬并保留其塑性记忆。此外，PTFE缝线中遇到的蠕变率明显低于聚丙烯缝线。聚丙烯缝线的方结、奶奶结或外科结的打结牢固度均为每结三扣。相比之下，PTFE方结或奶奶结的打结牢固度需要七扣；牢固的外科结则需要六扣。未打结和打结的PTFE缝线的断裂强度约为未打结和打结的聚丙烯缝线的一半。打结方式显著降低了聚丙烯缝线的断裂强度，但未改变PTFE缝线的断裂强度。两种缝线断裂前的伸长百分比无显著差异。以功恢复衡量，聚丙烯缝线的弹性大于PTFE缝线。基于其独特的生物力学性能特征，PTFE缝线在血管和心脏手术中应占有重要地位。
