The present disclosure relates to adrive mechanism for a medicament delivery device according to the disclosure comprises a compression member comprising a first cavity containing a first volume of fluid, said compression member also comprising a second cavity containing a second volume of fluid; a passage for fluid communication between the first cavity and the second cavity; a first movable piston arranged to seal the first cavity; a second movable piston arranged to seal the second cavity; wherein movement of the first movable piston or of the second movable piston, by an applied force, causes a relative change of volume between the first volume of fluid and the second volume of fluid, via a fluid flow through said passage, such that the respective second movable piston or the first movable piston is also moved.

The invention provides a safety injector needle. The safety injector needle includes a needle seat, an injection needle axially fixedly connected to the needle seat, and a trigger protection assembly assembled on the needle seat, the needle seat includes an assembly part and a fixing part; the trigger protection assembly includes a case, a trigger mechanism and an elastic element; the case is arranged in a hollow tube shape; the trigger mechanism includes a first trigger mechanism and a second trigger mechanism. The first trigger mechanism can slide along the extension direction of the case under the action of the elastic element.; the second trigger mechanism can slide along the extension direction of the needle seat under the action of the elastic element, so that the injection needle is completely contained between the trigger mechanism and the needle seat after the safety injector needle is used.

An injection device with distal and proximal ends includes a housing, a needle-protecting sleeve that is longitudinally movable relative to the housing, a container holder that is longitudinally movable relative to the housing toward the proximal end from a non-delivery position to a delivery position, and a needle-protecting sleeve spring that is operatively coupled between the needle-protecting sleeve and the container holder such that the sleeve is longitudinally movable toward the distal end from an initial position to an activating position and toward the proximal end from the activating position to an end position. The sleeve spring is strained by a first amount when the sleeve moves from its initial position to its activating position, and by a second amount when the container holder moves from its non-delivery position to its delivery position.

The present invention relates to a needle cover assembly to be used with a medicament delivery device, wherein said needle cover assembly (10) is disposable and comprises a retainer element (50) connectable to the medicament container holder; a hub (16) having a longitudinal axis and comprising a double pointed injection needle (22) with a proximal needle end (24) and a distal needle end (48), wherein the proximal needle end projects a distance from the hub (16) along the longitudinal axis, and a shield (18) covering at least the proximal needle end and a portion of the hub (16). The invention is characterised in that said shield (18) comprises a detachable element (26), that the shield (18) is attached to the hub (16) when said detachable element (26) is attacked to the shield (18), corresponding to an untampered state, and that the shield is released and is telescopically movable in relation to the hub (16) along the longitudinal axis when said detachable element (26) is detached from the shield (18) corresponding to an activated state.

According to the invention, an injection device (D) comprises a pre-filled syringe and a safety device. The pre-filled syringe comprises a barrel with an inner cavity in fluid communication with a hypodermic needle attached to a distal end of the pre-filled syringe and a piston fluid-tightly sealing a proximal end of the inner cavity. The safety device comprises a support body for retaining the pre-filled syringe therein, an outer body operably connected to the piston, a needle shield and a releasable retaining means (R). The retaining means comprises a radial projection and a longitudinal recess adapted to receive the radial projection. The radial projection is connected to or integral part of one of the support body or the outer body and a longitudinal recess formed into the other of the support body or the outer body. The needle shield, the support body and the outer body are telescopable relative to each other. The piston is movable in a distal direction to expel a medicament contained in the inner cavity through the hypodermic needle by a manual actuation of the outer body. A telescoping movement of the outer body with respect to the support body is restricted by the retaining means (R) when the needle shield is moved with respect to the support body in a proximal direction from an initial position (I) towards a retracted position (II). The retaining means (R) is released when the needle shield reaches the retracted position (II) allowing for a telescoping movement of the outer body with respect to the support body to expel the medicament contained in the pre-filled syringe through the hypodermic needle.

A protective sheath (100) for a cannula (210) arranged on a hub (200) which can be fitted onto a syringe (300), the sheath including female elements intended to cooperate with male elements (201) of the hub (200) for guiding thereof, and characterized in that the female elements include a retracted position before use RBU, a retracted position during use RU, and a retracted position after use RAU, wherein the whole length of the cannula (210) is inside the sheath (100), the female elements further include an ejection position E, wherein whole or part of the cannula (210) protrudes out of the sheath (100), and further characterized in that at least two of the RBU, RU, and RAU positions are substantially transversally aligned.

A drive mechanism for a delivery device comprising, a rotator comprising an outer surface and an inner surface, the rotator configured to rotate from a first position to a second position. A needle cover comprising an inner surface that engages the outer surface of the rotation. A rotatable plunger rod comprising an outer surface configured to engage the inner surface of the rotator. When the rotator rotates from the first position to the second position, the rotatable plunger rod is rotated by the rotator and the plunger rod spring is released from a pre-tensioned state to exert a force on the rotatable plunger rod.

A needle assembly is disclosed, for use with an injection device. The needle assembly comprises a needle hub (20) having a needle (22) and a needle shield (40) arranged for relative axial movement with respect to the needle hub, between a retracted position in which the tip of the needle projects beyond a forward end of the shield and an extended position in which the tip of the needle does not project beyond the forward end of the shield. The needle shield (40) is axially biased towards the extended position. The needle shield (40) is further arranged to be torsionally biased for relative rotational movement with respect to the needle hub (20).

The invention relates to a shield triggered injection device with a triggering mechanism for injecting doses of a liquid drug. The injection device has a housing structure with a distal end and a proximal end, and a needle shield rotationally mounted relatively to the housing structure such that the needle shield is rotatable between a first position and a second position and which the needle shield when rotated from the first position to the second position is guided helically in a helical track. Further, an axially movable trigger element for releasing a set dose to be automatically ejected upon proximal movement of the trigger element against a bias is provided. The trigger element is provided with an axial locking arm which is biased into the helical track to block the passage through the helical track at least in one rotational direction.

The invention relates to a drug delivery device for setting and dispensing a dose of a drug, comprising: a support body having a first end defining a first opening and a second end defining a second opening, the support body configured to retain a syringe barrel sealed by a stopper slidably disposed therein along an axial direction and adapted to have an integrated needle or to be coupled with a needle assembly, a needle shield adapted to be coupled to one of the ends of the support body, slidably disposed thereon and keyed to the support body for preventing relative rotation, wherein at least one guiding track is defined on the support body and at least one retaining clip arranged on the needle shield is deflectable by the guiding track, wherein the guiding track is configured such that the retaining clip follows a first path when the needle shield is depressed from an extended position to a retracted position for needle extension and that the retaining clip follows a different second path when the needle shield is subsequently extended, wherein a non-return catch is arranged for catching the retaining clip at the end of the second path.