What should you know about copper tube aluminum fin coil?

Copper IUDs use copper around a flexible frame. They do not contain aluminium fins, and a coil is not made by a tube-coiling machine in a clinic. The device sits inside the uterus and releases copper locally, creating an environment that interferes with sperm movement and fertilisation. It does not protect against sexually transmitted infections. Some people notice stronger cramps or heavier bleeding, especially around early periods after insertion; others have few changes.

If you are considering this option, book a consultation to review your menstrual pattern, pregnancy possibility, previous pelvic problems and contraception goals. A clinician checks whether an intrauterine device is suitable, explains the insertion process and discusses how to check its threads. Do not try to insert, reposition or remove a coil yourself. If you want to compare a non-hormonal device with a hormonal option, read about the [Copper IUD Device](/materials/copper-iud-device/) and [Hormonal Coil](/treatments/contraception-and-family-planning/hormonal-coil/).

Contact a clinician promptly for severe or worsening pelvic pain, fever, unusual-smelling discharge, very heavy bleeding, faintness, or a positive pregnancy test while the device is in place. Seek urgent help for sudden intense pain, collapse or heavy bleeding that makes you feel unwell. A clinician should also assess you if the threads suddenly feel much longer, much shorter or cannot be felt.

Ask whether your bleeding pattern could change, how discomfort will be managed during insertion, when the device should be checked, what to do if the threads change, and which symptoms need same-day assessment.