A delivery device for delivering fluid fluidic media consists of a disposable housing portion (20), a durable housing portion (22) and a base portion (450), an adhesive material (101) affixed to one side of the base portion for securing it to a patients skin. The disposable housing portion (20) is affixed to the other side of the base portion from the adhesive, and has means whereby the durable housing portion (22) can be detachably affixed to the disposable housing portion on top of the base portion (450). There is also provided an injection site (103) as part of the base portion (450) or the disposable portion through which a hollow needle or cannula may be inserted into the users skin when the adhesive on the base portion is secured to the users skin. Optionally the affixing means comprises at least one flexible pawl (174) on one of the durable housing portion and disposable housing portion and at least one receptacle having a shape for receiving the at least one flexible pawl on the other of the disposable housing portion and the durable housing portion.
