A dual chambered syringe includes: an inner barrel defining a first inner chamber, the inner barrel having an apertured stopper at its distal end, the inner barrel being open at its proximal end; a shaft adapted to fit within the inner barrel, the shaft having a distal end which is engageable with the aperture of the stopper; a device for controlling engaging and disengaging of the distal end of the shaft with the aperture of the stopper; an outer barrel concentric with the inner barrel defining a second inner chamber, the outer barrel having a distal end for receiving and dispensing fluids and a proximal end into which the distal end of the inner barrel is insertable into the second inner chamber; the apertured stopper engages the second inner chamber of the outer barrel and selectively prevents or permits the passage of fluids between the outer barrel second chamber and the inner barrel first chamber; the inner barrel having an engageable surface on its outside surface; and, the outer barrel having operatively associated therewith an engaging device for selective engagement and disengagement with the engageable surface on the inner barrel.

An autoinjector includes a case adapted to hold a medicament container having a needle, a needle shroud slidably disposed in the case and translatable between an extended position relative to the case in which the needle is covered and a retracted position relative to the case in which the needle is exposed, and a plunger slidably disposed in the case. The case includes a rib. The plunger includes a plunger boss adapted to abut the rib and the needle shroud when the needle shroud is in the extended position and disengage the rib when the needle shroud is in the retracted position to allow the plunger to translate axially relative to the case.

An autoinjector for dispensing a liquid product, in particular a highly viscous medication, includes: a housing, a product container, which is arranged in the housing and has a slidable piston, wherein the piston can be slid in a dispensing direction in order to dispense the product contained in the product container, a forward drive element, which acts on the piston as the product is being dispensed, a first spring, which is preloaded such that the product can be dispensed from the product container by the sliding of the forward drive element and the piston, and a rotation element, which is operatively coupled to the forward drive element, wherein the first spring acts on the rotation element in such a way that the rotation element is set into rotation in order to dispense the product, wherein the rotation element or the forward drive element has a thread having a variable pitch.

Syringe attachments and syringes have particular suitability to the precision dispensing of small amounts of high viscosity materials, such as dermal fillers. An attachment may include a main body having an assist feature that includes a wheel and pinion gears on each side of the wheel which engage respective racks on the syringe body. A mechanical advantage may be provided to the user as the wheel is rotated relative to the syringe body and racks. Syringes and attachments may include precision position indicators viewed from multiple positions to enable a user to determine plunger position and the amount of dispensed contents with precision. An alternative configuration attachment may be slidably secured to a syringe to permit a user to operation the syringe from a lateral position using sliding movement of the thumb and fingers of one hand, for example. This configuration may be particularly suitable for self-administered insulin injections.

An autoinjector and method of injection are described. A power spring causes rotation of a drive nut about the central axis of the autoinjector that, in turn, causes a middle screw to rotate in the same direction as the drive nut and also to move in the distal direction while pushing a center screw in the distal direction that pushes the syringe and needle. The center screw also pushes a plunger that pushes the fluid out of the syringe. After injection, a locked retract screw is freed and rotates in the same direction as the middle screw causing the syringe to retract the syringe into the housing.

A medical device comprising an enclosure defining a cavity for containing agent, a lumen for receiving a pressurized gas, and a barrier positioned between the cavity and the lumen, the barrier including at least one opening for storing agent, wherein rotation of the barrier relative to the lumen establishes fluid communication between the at least one opening and the lumen for delivering agent from the at least one opening to the lumen.

An injection device and an injection device trainer for training a user to use an injection device. Each one of the injection device and the injection device trainer can include: a body portion; an actuator positioned towards a proximal end of the body portion, the actuator moveable from a proximal position to a distal position; a shield positioned towards a distal end of the body portion, the shield moveable between: an initial position; an extended position that is more distal relative to the body portion than the initial position; and a connector that connects the actuator to the shield such that movement of the actuator from the distal position towards the proximal position pulls the shield from the extended position to the initial position.

A needleless injector is provided. The needleless injector includes a loading lever having a working arm part having a lever shaft, a towing member inserted inside the cylinder housing, a link having one end portion pin-coupled to the working arm part and the other end portion pin-coupled to the towing member, an inner cylinder inserted inside the cylinder housing, a spring inserted into the inner cylinder, an actuating head inserted into the inner cylinder in front of the spring and having a catching protrusion configured to be inserted into the slit, and a trigger means having a stopper head part configured to be able to be inserted into the slit of the inner cylinder and detached from the slit. Accordingly, the needleless injector can achieve a reduction in size and thickness by having a simple structure even with a lever for reloading integrally formed therein.

An infusion device includes a housing with an interior chamber sized and configured to hold at least a flange and plunger of a syringe, a trigger held by the housing, and a lever in communication with the trigger and including an upwardly extending cam with a cam path having an upper end. The cam is in communication with the flange of the syringe. In response to actuation of the trigger to dispense fluid from the syringe, the upper end of the cam travels upward above the syringe and longitudinally toward a dispensing end of the syringe to linearly translate the plunger of the syringe in a first direction to dispense fluid from the syringe. To refill fluid into the syringe, the upper end of the cam travels downward and longitudinally away from the dispensing end of the syringe to linearly translate the plunger in a second direction to intake fluid.

A liquid administration device includes: a structure that includes: a cylindrical body including a bottom part in a distal portion and an opening in a proximal portion, a needle tube positioned in the distal portion of the cylindrical body, the needle tube having a sharp needle tip at a distal end, wherein a proximal end of the needle tube is communicable with an inside of the cylindrical body, and a gasket installed in the cylindrical body, the gasket being slidable in an axial direction of the cylindrical body; an operation member configured to perform a pressing operation by pressing the gasket such that a liquid is discharged from the needle tube; a pressing mechanism configured to generate a pressing force for pressing the gasket; and a pressing force transmission inhibiting mechanism configured to inhibit transmission of the pressing force to the gasket during the pressing operation.