Thomsen R J, Pasquale S, Nosher J
Int J Gynaecol Obstet. 1985 Jun;23(3):223-7. doi: 10.1016/0020-7292(85)90109-2.
This article describes the first use of ultrasound in locating in vivo NORPLANT subdermal contraceptive implants. Providing low dose, continuous contraception for women. the NORPLANT system utilizes Silastic tubing filled with levonorgestrel. The progestin-filled tubing is not radiopaque. Anticipating the large scale use of NORPLANT subdermal implants, the potential, but rare problem of difficult localization of an implant is recognized. The feasibility of using ultrasound for the painless and safe localization of NORPLANT rods and capsules is demonstrated.
本文介绍了超声首次用于体内定位诺普兰皮下避孕植入物的情况。诺普兰系统为女性提供低剂量、持续的避孕作用，它采用填充左炔诺孕酮的硅橡胶管。这种填充孕激素的管子不透X线。考虑到诺普兰皮下植入物的大规模使用，人们认识到植入物定位困难这一潜在但罕见的问题。本文证明了使用超声对诺普兰棒和胶囊进行无痛、安全定位的可行性。
