Implanon is long-term birth control mechanism that consists of a small rod inserted under the skin of a woman's upper arm. It may remain implanted for up to four years. This device contains etonogestrel a steroidal progesteron secreted into the patient's body. Implanon is manufactured by Merck & Co.
This birth control device lacks a tracking or identifying mechanism in images studies and has the potential to be "lost" in the patient, requiring multiple procedures to remove the device.