Final answer:
The levonorgestrol-releasing intrauterine system device used for contraception is Mirena, a hormonal IUD that can prevent pregnancy for up to 5 years.
Step-by-step explanation:
The levonorgestrol-releasing intrauterine system (IUD) device used for contraception that you're referring to is Mirena. This is a type of hormonal IUD that is also sometimes called an intrauterine system, or IUS. It is inserted into the uterus by a physician and can prevent pregnancy for up to 5 years. The IUD releases progestin into the uterus, which prevents ovulation, thickens the cervical mucus to prevent sperm from reaching the egg, and affects the ability of a fertilized egg to implant in the uterus.