Injection or infusion device comprising an improved housing and release liner for removing sterile barrier films using the release liner

An injection device configured for attachment to skin of a patient, comprising

• a housing;
• a skin adhesive layer coupled to an outside surface of the housing configured for attaching the injection device to the skin of the patient;
• a release liner covering the skin adhesive layer thereby preventing skin attachment of the injection device;
• a first film comprising a first end and a second end, wherein the first end is coupled to an internal surface of the housing and forms a removable sterile barrier, and wherein the second end is coupled to an exterior surface of the release liner without contacting the skin adhesive layer;
• a second film comprising a first end and a second end, wherein the first end is coupled to another internal surface of the housing and forms a removable sterile barrier, and wherein the second end is coupled to the exterior surface of the release liner without contacting the skin adhesive layer;
• wherein each of the housing, the skin adhesive layer and the release liner comprises a notch or an aperture, wherein the notches or the apertures define a passage extending between an interior of the housing to an exterior of the housing, and wherein the second end of each of the first film and the second film extends through the passage to the exterior of the housing, and
• wherein at least one of the notches or the apertures comprises a U-shaped aperture defining a notch opening configured to receive the first film.