Patent attributes
An attachable needle assembly (2) for use on a medication delivery pen (4), the needle assembly (2) comprising a housing (10) enclosing a spike housing (8) configured to (a) engage the medication delivery pen (4), and (b) pierce a reservoir septum (6) of the medication delivery pen (4), a communication septum (72, 76) of the needle assembly (2) defining a septum chamber (80, 82), the septum chamber (80, 82) being in fluid communication with the spike housing (8), a plurality of needles (18) disposed in the communication septum (72, 76), a selection ring insert (30) that rotates and identifies a needle (24) of the plurality of needles (18), and a selection ring (36) exposes the selected needle (24) and moves the selected needle (24) into fluid communication with the septum chamber (80, 82), wherein when the housing (10) is in a first position, the plurality of needles (18) is not exposed, and when the housing (10) is in a second position, one of the plurality of needles (24) is in fluid communication with the septum chamber (80, 82) and exposed for medicament delivery.
