Lipov E G, Sosis M B, McCarthy R J, Ivankovich A D
Department of Anesthesiology, Rush-Presbyterian-St. Luke's Medical Center, Chicago, IL 60612.
J Clin Anesth. 1994 Sep-Oct;6(5):411-3. doi: 10.1016/s0952-8180(05)80013-3.
To determine whether the window design of pencil-point spinal needles leads to deformation under lateral or axial loading conditions.
Independent-measure, multigroup study of the force required to deform needles.
Independent testing laboratory.
The force necessary to bend 22- and 24-gauge Sprotte, 22- and 25-gauge Whitacre, and 22- and 25-gauge Quincke needles was measured using an Instron gauge (Instron Corp., Canton, MA) after microscopic verification of needle uniformity. Effects of lateral and axial forces were evaluated in separate experiments. The force needed to bend the Sprotte needles was less than that needed for the Whitacre and Quincke needles of similar size when lateral or axial pressure was applied. Microscopic inspection of the needles showed a marked variability in the window area placement in a single lot of Sprotte needles. Examination of the needle tips demonstrated that the Sprotte needles were most likely to bend at the needle window, while the Quincke and Whitacre needles deformed at the point of clamping.
The Sprotte needles have an inherent design weakness to lateral and axial pressure, which may result in a greater number of needle tip deformations upon needle insertion. The nature of this deformation may result in difficulty in needle withdrawal and possibly fracture of the needle tip.
确定铅笔尖式脊椎穿刺针的窗口设计在横向或轴向加载条件下是否会导致变形。
对针变形所需力进行的独立测量、多组研究。
独立测试实验室。
在通过显微镜验证针的均匀性后，使用英斯特朗压力试验机（英斯特朗公司，马萨诸塞州坎顿）测量弯曲22号和24号斯普罗特针、22号和25号惠塔克针以及22号和25号昆克针所需的力。在单独的实验中评估横向和轴向力的影响。当施加横向或轴向压力时，弯曲斯普罗特针所需的力小于相同尺寸的惠塔克针和昆克针所需的力。对针的显微镜检查显示，在一批斯普罗特针中，窗口区域的位置存在明显差异。对针尖的检查表明，斯普罗特针最有可能在针窗口处弯曲，而昆克针和惠塔克针在夹紧点处变形。
斯普罗特针在横向和轴向压力方面存在固有的设计弱点，这可能导致在插入针时针尖变形的数量更多。这种变形的性质可能会导致拔针困难，并可能导致针尖断裂。
