Department of Obstetrics and Gynecology, Lincoln Medical Center, Weill Medical College of Cornell University, New York, NY, USA.
J Perinat Med. 2009;37(6):669-71. doi: 10.1515/JPM.2009.136.
Decreasing the maximum force applied during traction to the base of the fetal skull using a less rigid polyurethane forceps is the basis of this study. Our hypothesis was that less force would be generated with polyurethane forceps than with steel forceps.
To test a new soft polyurethane obstetrical forceps for maximal force generated to the base of the skull during simulated occiput anterior deliveries and to compare this to a similar shaped steel forceps.
After designing a prototype polyurethane forceps, we used a pelvic manikin model and a fetal manikin model. Force and load sensors were attached at the inner tips of the distal forceps blade. A Tekscan 201 (accurate for measuring 0-25 pounds of force) 0.0008 inches flexible printed circuit was used that measured contact forces. Forceps with an attached calibrated sensor were applied to the fetal head while inside the pelvic model.
The median maximum traction force at the base of the fetal skull was 4.60 pounds (range 4.3-4.62) for polyurethane forceps vs. 9.52 pounds (range 9.22-9.52) for steel forceps (P=0.027).
The polyurethane forceps applied 50% less overall mechanical force than the steel forceps at the tip of the forceps and base of the skull during simulated occiput anterior outlet deliveries.
本研究的基础是使用刚性较低的聚氨脂钳子减少对胎儿颅底施加的牵引最大力。我们的假设是聚氨脂钳子产生的力会小于钢钳子。
测试一种新的软聚氨脂产科钳子在模拟前顶骨分娩时对颅底产生的最大力，并将其与类似形状的钢钳子进行比较。
在设计了聚氨脂钳子原型后，我们使用了骨盆模型和胎儿模型。力和负载传感器被连接到远端钳子刀片的内端。使用 Tekscan 201（可精确测量 0-25 磅的力）0.0008 英寸柔性印刷电路板测量接触力。带有附加校准传感器的钳子在骨盆模型内应用于胎儿头部。
在模拟前顶骨出口分娩时，胎儿颅骨底部的聚氨脂钳子最大牵引力中位数为 4.60 磅（范围 4.3-4.62），而钢钳子为 9.52 磅（范围 9.22-9.52）（P=0.027）。
在模拟前顶骨出口分娩时，聚氨脂钳子在钳子尖端和颅骨底部的总体机械力比钢钳子小 50%。
