Sizes of copper coil



Hi. I was just wondering, how do you decide whether to fit the small copper coil or the larger more common size of copper coil. I had one fitted this morning and was just curious. Thanks!


Hello, many thanks for your question. It often depends on the width of the cervical canal - the narrow corridor between the vagina and the uterus. This is the narrowest bit that the coil has to pass through.

You can see where this is on the diagram below