A medicament delivery system is disclosed including disposable pen needles (10, 60, 120) each having a stainless steel needle or cannula (12, 62, 122) with a concealed or a very short non-injection end (28, 78, 128) that is not intended to pierce the septum (8) of the drug storage compartment (6) of a medication pen (2), thus reducing the risk of needle stick injuries. Several types of non-metallic interfaces (30, 80, 100) serve as intermediaries between the pen needles (10, 60, 120) and a medication pen (2) and perform the septum-piercing function. These improve the flow of medicament to the needle or cannula (12, 62, 122) due to the larger lumen of the plastic interface (30, 80, 100) that directly feeds medicament to the needle or cannula (12, 62, 122), allowing for even smaller gauge needles for improved patient comfort.
