Bank H, MacDonald M, Wiechert S
Contraception. 1984 Jan;29(1):65-74. doi: 10.1016/0010-7824(84)90059-3.
X-ray radiographs were used to monitor the migration of Renouve -dip radiopaque tracer through the multifilament tail of Dalkon Shield intrauterine devices (IUDs). The movement of the tracer was more rapid and migrated a greater distance through the long end of the tail than through the short end of the tail. The double knot serves as at least a temporary barrier to the migration of tracer from the long end of the tail, but this barrier was circumvented when drops of Renouve -dip radiotracer were placed at both ends of the tail. Migration of Renouve -dip radiotracer was prevented when the end of the Dalkon Shield tail was fused by heating. No migration of this tracer occurred on the tails of commonly used IUDs which possessed monofilament tails, thus demonstrating that fluid migration occurs within and not on the surface of the multifilament tail.
利用X射线照片监测Renouve -dip不透射线示踪剂在Dalkon Shield宫内节育器（IUD）复丝尾丝中的迁移情况。示踪剂的移动速度更快，通过尾丝长端迁移的距离比通过尾丝短端迁移的距离更远。双结至少对示踪剂从尾丝长端的迁移起到了临时屏障的作用，但当在尾丝两端放置Renouve -dip放射性示踪剂液滴时，这一屏障就被绕过了。当Dalkon Shield尾丝末端通过加热融合时，Renouve -dip放射性示踪剂的迁移被阻止。在具有单丝尾丝的常用宫内节育器的尾丝上未发生这种示踪剂的迁移，从而表明液体迁移发生在复丝尾丝内部而非表面。
