Generally described herein are an apparatus, a method of use, and/or a system related to an implant detector for detecting whether a needle inserted into a body of a patient has come into contact with a sensitive portion of the implanted gastric banding system (e.g., the tube connecting the access port to the gastric band). For example, a warning light may be activated. By alerting the medical professional when the inserted needle has come into contact with a sensitive portion of the implanted gastric banding system, the implant detector may prevent the medical professional from puncturing the contacted sensitive portion.