Bellian K T, Thacker J G, Tribble C G, Powell D M, Becker D G, Zimmer C A, Morgan R F, Edlich R F
Department of Plastic Surgery, University of Virginia School of Medicine, Charlottesville 22908.
Am Surg. 1991 Sep;57(9):591-601.
Standardized reproducible tests have been developed to determine the biomechanical performance of cardiovascular needles. The parameters used to assess performance were: 1) sharpness, 2) resistance to bending, and 3) ductility. Four comparable groups of tapercut and taper point cardiovascular needles were selected from different manufacturers for these biochemical studies. The results of this testing demonstrated that needle geometry, needle composition, and the manufacturer were important determinants of needle performance. When comparable needles were evaluated, the biochemical performance of cardiovascular needles manufactured by Ethicon, Inc. (Somerville, NJ) were superior to needles produced by other manufacturers. The superior performance characteristics of the cardiovascular needles produced by Ethicon, Inc. were related to their unique stainless steel alloy, American Society for Testing Materials 45500, which has greater yield and tensile strengths than the alloy used by the other manufacturers. This stainless steel alloy was ideal for the production of tapercut needles, which combined some of the features of a reverse cutting edge needle and taper point needle. Its very short cutting edges allowed it to penetrate the membrane at considerably lower penetration forces than were encountered with comparable taper point needles. In addition, the investigation indicated that the trocar point cardiovascular needles produced a large triangular defect whose diameter was much larger than that of the needle body. For this reason, the use of the trochar point needle is not recommended in cardiovascular surgery.
已经开发出标准化的可重复测试来确定心血管针的生物力学性能。用于评估性能的参数有：1）锋利度，2）抗弯曲性，3）延展性。从不同制造商中选出四组具有可比性的锥形切割和锥形尖端心血管针用于这些生物化学研究。该测试结果表明，针的几何形状、针的成分以及制造商是针性能的重要决定因素。在评估可比的针时，Ethicon公司（新泽西州萨默维尔）生产的心血管针的生物化学性能优于其他制造商生产的针。Ethicon公司生产的心血管针的卓越性能特征与其独特的不锈钢合金美国材料与试验协会45500有关，该合金的屈服强度和抗拉强度比其他制造商使用的合金更高。这种不锈钢合金是生产锥形切割针的理想材料，它结合了反向切割边缘针和锥形尖端针的一些特征。其非常短的切割边缘使其能够以比可比的锥形尖端针低得多的穿透力穿透膜。此外，调查表明，套管尖端心血管针会产生一个大的三角形缺损，其直径比针体大得多。因此，不建议在心血管手术中使用套管尖端针。
