Step 1: Understanding the Concept:
Intra-Uterine Devices (IUDs) are effective contraceptives inserted by doctors into the uterus.
Detailed Explanation:
IUDs are classified into:
- Non-medicated IUDs: Example: Lippe's loop. These increase phagocytosis of sperm within the uterus.
- Copper-releasing IUDs: Examples: CuT, Cu7, Multiload 375. These release Cu ions which suppress sperm motility.
- Hormone-releasing IUDs: Examples: Progestasert, LNG-20.
Step 2: Final Answer:
Lippe's loop is a non-medicated IUD.