A medical device (116) for transcutaneously inserting a cannula (145) into a body tissue, a medication device (110) for delivering at least one therapeutical medical fluid to a user and a method for transcutaneously inserting a cannula into a body tissue are disclosed. The medical device (116) comprises:• at least one cannula (145), wherein the cannula (145) comprises a lumen which is fully or partially enclosed by a wall (211) of the cannula (145)；• at least one patch (138) configured to be mounted onto a skin of a user, wherein the patch (138) comprises at least one patch base (140), wherein the patch (138) further comprises at least one integrated insertion mechanism (144) for driving the cannula (145) from a storage position (204) within the patch (138) into an inserted position (218) within the body tissue；wherein the patch (138) further comprises at least one reservoir (146) configured for storing at least one therapeutical medical fluid and wherein the integrated insertion mechanism (144) is a spring driven insertion mechanism (148).
