1988年ACOG组织建议对1965年产钳分类进行重新修订。 1965年产钳分出口、中位和高位。出口产钳阳定胎先露已达盆底,儿头矢状缝在骨盆前后径上。中位产钳胎头衔接,儿头在出口未见到,可以有些旋转。高位产钳胎先露浮动。按此分类的缺点是出口产钳限定面太窄,而中位产钳面太宽,且含糊不清。 In 1988 the ACOG suggested a revision of the forceps classification of 1965. 1965 forceps points exit, the median and high. Export production Yang positive fetal clamp has reached the pelvis, sagittal suture in the pelvis before and after the diameter. Central production forceps head convergence, the child did not see the exit, you can have some rotation. High production forceps exposed first floating. The disadvantage of this classification is that the export pliers are too narrow and the median pliers are too wide and vague.