An auto-injector device comprises a stopper for expelling a medicament out of a medicament reservoir; a driving element which has a first configuration and a second configuration and is configured to change shape from the first configuration to the second configuration when the temperature of the driving element is raised above a shape change temperature, so as to drive the stopper of the syringe mechanism through the medicament reservoir; and a heating mechanism configured to actively heat the driving element. The heating mechanism is a chemical heating element configured to generate heat through an exothermic process or comprises a fluid reservoir for retaining a fluid; a heater configured to heat the fluid in the fluid reservoir; a pump configured to expel the fluid out of the fluid reservoir; and a connecting conduit arranged to carry the fluid from the fluid reservoir to the driving element.

An autoinjector having a body (1) receiving a reservoir (S), the reservoir containing fluid and including a piston (P); a piston rod (5) adapted to co-operate with the piston (P) of the reservoir (S), the piston rod (5) movable by an injection spring (8) between a primed position and an injection position in which the piston rod (5) has moved the piston (P) of the reservoir (S); and an indicator device for indicating that the autoinjector may be removed from the injection site. The autoinjector includes a retarding system for delaying actuation of the indicator device relative to the end of injection, the retarding system including a dashpot (16) containing a fluid and a piston (19) arranged in the dashpot (16). The retarding system has the dashpot (16), the piston (19), a retarding spring (18), a locking key (20), and the piston rod (5), and the piston rod (5).

The auto-injector consists of a front unit connected to a rear unit, wherein the front unit contains a syringe holder with a syringe coaxially sliding between injecting and secure positions within an activating element preloaded via an ejection spring to secure a trigger button through a stopper located in the rear unit.

The rear unit contains a syringe pusher with a plunger managed via a controller coaxially moved by an injection spring to the front unit upon activating the trigger for injecting medication. After the injection, the activating elements revert to allow the controller to release the syringe which moves into to secure position with the syringe holder and the plunger by the ejection spring.

When the syringe enters a safe position, the controller moves by the injection spring between the activating element and the syringe holder to prevent the syringe from sliding toward the injection side.

An automatic injection device including a generally cylindrical syringe body having an opening, an outlet and an inner cylindrical surface adapted to contain an injectable liquid to be injected at an injection site via the outlet; a piston disposed in the cylindrical syringe body; a driving assembly, including an elongate plunger element having a forward end adapted to be axially inserted into the generally cylindrical syringe body and an at least partial forward sealing element mounted onto the elongate plunger element adjacent the forward end for creating an at least temporary slidable seal between the elongate plunger element and the inner cylindrical surface, whereby axial insertion of the elongate plunger element and the forward sealing element into the generally cylindrical syringe body creates friction between the forward sealing element and the inner cylindrical surface and also creates an at least temporary air spring between the forward sealing element and the piston, wherein the friction and the air spring dampen motion of the elongate plunger element.

An automatic injection device is provided, where the device includes a syringe carrier and a retraction assembly. The syringe carrier includes two identical parts that are discrete from one another and interlock with one another. The retraction assembly includes a shuttle and a follower, the follower having a moveable latch. The follower has a coupled configuration in which the latch is biasedly coupled to the shuttle, and a decoupled configuration in which the latch is in sliding engagement with a curvilinear surface of the shuttle.

The present disclosure includes systems, methods, and apparatuses for dispensing a volume (e.g., a volume of liquid or medication) during intraosseous infusion. In some embodiments, a resilient member is used to bias a portion of an arm towards a contracted position with a force sufficient to depress a plunger of a syringe, and a damper is used to resist movement of the portion of the arm from the extended position toward the contracted position to control a rate at which the resilient member can move the portion of the arm from the extended position toward the retracted position, and thereby limit the rate at which a volume is dispensed from the syringe. In other embodiments, a flow control valve may be used instead of a damper to limit the rate at which a volume is dispensed from the syringe.

The present disclosure relates to a drug delivery device, having a longitudinal axis and comprising a plunger movable along the longitudinal axis and a guide curve adapted to engage at least one part of the plunger so as to guide the plunger when the plunger is being released to move along the longitudinal axis.

This application relates to force reduction in injection devices. According to a first aspect, the specification describes an injection device comprising: a medicament container; a stopper translatably disposed within the medicament container; a plunger rod, the plunger rod comprising a plunger head; a drive mechanism for displacing the plunger rod into the medicament container; and a force reduction feature, wherein the plunger rod is operable to displace the stopper; and wherein the force reduction feature is arranged to damp at least a part of a plunger rod motion when the plunger rod is driven by the drive mechanism.

The present application relates to shock absorbers for injection devices. According to a first aspect, this specification discloses an injection device comprising: a medicament container; a stopper translatably disposed within the medicament container; and a plunger rod comprising: a plunger rod body; and a shock absorber, wherein the plunger rod is operable to displace the stopper; and wherein the shock absorber contacts the stopper during displacement of the stopper by the plunger rod, thereby reducing an impact force between the plunger rod and the stopper.

An injection device is presented having a housing, a container holder, a first and a second energy accumulating member arranged in the interior of the housing adapted to accumulate and store energy, a sleeve, a plunger holder operationally associated with said first energy accumulating member such that the plunger holder and the container holder are axially moveable in relation to the housing a predetermined distance towards the proximal end of the injection device from an initial position to a position following needle penetration, and a plunger rod being operationally associated with said second energy accumulating member such that the plunger rod is axially moveable in relation to the container holder, wherein in the initial position movement of the plunger holder is substantially inhibited by at least one first biasable member that recoils when being overlapped by an opening and/or recess of the sleeve such that the plunger holder is released.