A locking structure for an injection pen. The locking structure for an injection pen is disposed among a spiral duct (30), a push rod (81) and a propelling lever (60) of a circularly-pushing device (1) of the injection pen. The propelling lever (60) penetrates in a tube center hole (331) of a linkage wall (33) in the spiral duct (30) by means of a dosage control section (63) having a push thread (631). The push rod (81) penetrates in the propelling lever (60) by means of a rod portion (811). The locking structure comprises a necking ring portion (36), a buckling recessed portion (814), and an elastic clasp (612). The necking ring portion (36) is formed at the rear side surface of the linkage wall (33) in the spiral duct (30). The buckling recessed portion (814) is formed in the front section of the rod portion (811) of the push rod (81). The elastic clasp (612) is formed in the rear end of the propelling lever (60) adjacent to the dosage control section (63).

An injection pen comprises a circularly pushing device (1) and a vial housing (2), and is used to combine a medication vial (3) with a needle (4). The circularly pushing device (1) comprises a jointing member (10), a spiral sleeve (20), a spiral duct (30), a spirally-pushing tube (40), a threaded-connection shrink-ring (50), a propelling lever (60), a one-way ratchet ring (70), and an injection operation member (80). During the injection, the one-way ratchet ring (70) on a push rod (81) is jointed with a one-way ratchet groove portion (46) of the spirally-pushing tube (40) so as to restrain the rotation directions of the push rod (81) and the spirally-pushing tube (40); the propelling lever (60) cannot be rotated due to the limit of the jointing member (10).

The invention is related to an apparatus comprising a dispense interface for use with a drug delivery device, the dispense interface comprising a lockout element being arranged at least partially between an outer body of the dispense interface and an inner body of the dispense interface and wherein the lockout element is configured to be removeably maintained in a first position, such that when the dispense interface is first attached and then removed from said drug delivery device, the lockout element moves into a second position, wherein the lockout element in the second position is configured to prevent said dispense interface from being reattached to a drug delivery device.

The present invention relates to a dose setting mechanism for a drug delivery device and a method of using same. The mechanism comprises a drug delivery device housing, a dose dial sleeve positioned at least partly in the housing and being rotatable during dose setting and dose delivery, a clutch rotatable during dose setting and non-rotatable during dose delivery, and a clutch nut, that is threadedly engaged with the clutch and is splined to the housing to prevent rotation of the clutch nut.

A dose setting mechanism for a drug delivery device includes a primary drug delivery assembly and a secondary drug delivery assembly. The dose setting mechanism includes a primary dose dial component for setting a dose in the primary drug delivery assembly and a secondary dose dial component for setting a dose in the secondary drug delivery assembly. The primary dose dial component and the secondary dose dial component are configured to rotate during dose setting. A gear mechanism is configured such that in a first phase of the dose setting, rotation of the primary dose dial component is transferred to the secondary dose dial component and such that in a second phase of the dose setting, the secondary dose dial component is decoupled from the primary dose dial component such that rotation of the primary dose dial component is prevented from being transferred to the secondary dose dial component.

A dose setting mechanism that prevents dispensing of a drug when an incorrect cartridge assembly is attached to the dose setting mechanism. Dispense of a drug may be allowed by preventing rotation of a spindle nut of a drug delivery device, and dispense of a drug may be prevented by not preventing rotation of the spindle nut. Preventing dispense of a drug may be accomplished by preventing rotation of the spindle when an incorrect cartridge assembly is inserted. Preventing dispense of a drug may be accomplished by preventing the spindle from applying an axial force on the cartridge when an incorrect cartridge assembly is inserted.

The invention is directed to a differential gear mechanism (26) for a drug delivery device with a primary drug delivery assembly (3) and a secondary drug delivery assembly (4), wherein the primary drug delivery assembly (3) comprises a primary dose dial sleeve (17) and wherein the secondary drug delivery assembly (4) comprises a secondary drive sleeve (24). The invention is also directed to a respective drug delivery device.

A maximum settable dose feature is disclosed that is set by a user or health care professional one time that prevents future injections from exceeding the desired maximum dose. The feature includes a locking band (5) initially in an unlocked configuration, which transforms to a locked configuration when activated after setting a desired maximum dose. The feature can include a trigger mechanism (6,11) to transform the locking band (5) to the locked configuration.

A dose setting mechanism is provided that includes a dose knob, a dose selector, a radial projecting rib and a snap element. The radial projecting rib is positioned circumferentially on an inside surface of the dose selector. The snap element includes a protrusion. The protruding rib has a reduced section that allows the protruding rib to move axially relative to the protrusion to initiate dose delivery.

The present disclosure relates to an injection device for expelling of a number of preset or user-selectable doses of a medicament, the injection device comprising: an elongated housing extending along a longitudinal axis, and a rotatable member and a counterpart member each comprising a first mechanical code and a second mechanical code, respectively. For setting of a dose the rotatable member is rotatable relative to the housing and relative to the counterpart member. During setting of the dose the rotatable member is constrained along the longitudinal axis relative to the housing or relative to the counterpart member. For expelling of a dose one of the rotatable member and the counterpart member is displaceable along the longitudinal axis into an expelling position relative to the other one of the rotatable member and the counterpart member only when the first mechanical code is aligned with the second mechanical code.