Perone Nicola
Department of Obstetrics, Gynecology and Reproductive Sciences, The University of Texas, Health Science Center at Houston, 78 South Creekside Court,Houston, TX77055,USA.
J Perinat Med. 2018 Apr 25;46(3):279-286. doi: 10.1515/jpm-2016-0421.
To describe an innovative electronically-controlled vacuum extractor (VE) in detail and to illustrate its performance characteristics, as observed in a laboratory study.
Thirty simulated, vacuum-assisted deliveries.
MAIN OUTCOME MEASURE(S): (1) The ability to measure in real-time of the pull applied and to sound an alert, when the traction approaches the negative pressure under the cup, to prevent its detachment. (2) The recording and printing of a graphic representation of the pull applied (vacuum delivery graph). (3) The emission of a warning signal when the 15-min time limit of continuous cup application on the fetal scalp, is reached.
No cup detachment occurred in any of the 15 vacuum-assisted deliveries, in which traction was kept below the adhesive force of the cup [44 lb (20 kg)], except in three cases, due to loss of negative pressure. In the remaining 15 tests, in which traction was greater than the adhesive force of the cup, "pull-offs" inevitably occurred. Furthermore, upon reaching the 15-min time limit of continuous cup application on the fetal cephalic model, a warning signal was emitted, as programmed. Conclusions We demonstrated that the electronically-controlled VE, with its distinctive pull-sensing handle, performs suitably for its intended purposes. The ability of the modernized device to decrease the incidence of cup detachment, secondary to the inadvertent application of excessive traction, may result in considerable safety, medico-legal and didactic advantages.
详细描述一种创新的电子控制真空吸引器（VE），并阐述其在实验室研究中观察到的性能特征。
30次模拟真空辅助分娩。
（1）实时测量施加的拉力，并在牵引力接近杯罩下的负压时发出警报，以防止杯罩脱落。（2）记录并打印施加拉力的图形表示（真空分娩图）。（3）当在胎儿头皮上连续使用杯罩达到15分钟时间限制时发出警告信号。
在15次真空辅助分娩中，除3例因负压丧失外，其余在牵引力保持低于杯罩粘合力[44磅（20千克）]的情况下，均未发生杯罩脱落。在其余15次测试中，由于牵引力大于杯罩粘合力，不可避免地发生了“脱落”。此外，在对胎儿头部模型连续使用杯罩达到15分钟时间限制时，按程序发出了警告信号。结论我们证明，具有独特拉力感应手柄的电子控制VE能够适当地实现其预期目的。现代化设备降低因意外施加过大牵引力导致杯罩脱落发生率的能力，可能会带来显著的安全、医疗法律和教学优势。
