Today, the most IUD is a small T-shaped device, available in two basic versions: Some continuously release copper, others release the hormone progestin.

• 当今，使用最多的宫内避孕器是一种呈T形的小装置，有两种类型可供选用：持续释放少许铜离子型，其他的成品为释放孕激素型。