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作者在连续400例体外受精-胚胎移植(IVF-ET)的前瞻性和随机分组研究中,对三种不同胚胎移植导管的特点进行了评价,旨在寻找一种容易应用、宫内种植准确、无毒、简单、价廉、适合于人体胚胎移植的导管。研究分为两部分:第一部分是临床对三种导管特点的比较及ET结果的评价;第二部分是检查导管的可能毒性作用。第一部分,将所有病例随机分为4组:Frydman导管组、Wallace导管组、TDT导管超声指导下组及无超声指导组。对每一次移植过程进行难易程度的判断。其标准是妇科医生和病人的主观感觉,即妇科医生认为导管能很容易进入宫腔定为极好或尚好;不能立即将导管插入宫腔且需进行某些辅助操作如宫颈扩张,则定为困难。宫颈钳的应用及移植后出血并非移植困难的指征。如在宫颈扩张后用指定的导管也不能完成移植过程而换另一导管
In a prospective and randomized study of 400 consecutive in vitro fertilization-embryo transfer (IVF-ET) studies, we evaluated the characteristics of three different embryo transfer catheters in an attempt to find an easy-to-use, accurate, Non-toxic, simple, inexpensive, suitable for human embryo transfer catheter. The study is divided into two parts: the first part is the clinical comparison of the characteristics of the three catheters and the evaluation of ET results; the second part is to examine the possible toxic effects of the catheter. In the first part, all cases were randomly divided into 4 groups: Frydman catheter group, Wallace catheter group, TDT catheter under ultrasound guidance group and no ultrasound guidance group. The difficulty of each transplant process to determine. The standard is the subjective perception of gynecologists and patients that gynecologists believe that the catheter can easily enter the uterine cavity as excellent or good; can not be immediately inserted into the uterine cavity and the need for some auxiliary operations such as cervical dilatation, then as difficult. The application of cervical forceps and bleeding after transplantation are not indications for difficult transplantation. If the use of the designated catheter after cervical dilatation can not complete the transplant process and change to another catheter