A medical device for carrying out at least one medical function. The medical device comprises at least one control part, which can be applied to a body surface of a user, and at least one functional element, which can be inserted into a body tissue of the user at at least one insertion site. The functional element can be connected to the control part. The functional element is designed to carry out at least one medical function. The control part has at least one base part with at least one supporting surface, which faces the body surface. The base part has at least one collection channel for collecting bodily fluid emerging from the insertion site.
