An automatic injection device is provided, where the device includes a syringe carrier and a retraction assembly. The syringe carrier may include two identical parts that are discrete from one another and interlock with one another. Carrier includes a cushion to support the syringe. Protrusions may be provided on cushion to further support syringe. 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.

Disclosed is an auto-injection apparatus for receiving a syringe, including: an outer casing enclosing a drive assembly and a syringe carrier configured to hold a barrel of the syringe, the syringe carrier being forward of the drive assembly and having stowed and delivery positions; an interlock extending between the syringe carrier and a syringe carrier housing at least partially surrounding the syringe carrier, the interlock preventing forward motion of the syringe carrier under the influence of an insertion actuator whilst in the stowed position. The drive assembly includes the insertion actuator for inserting a needle of the syringe into an injection site and a delivery actuator for driving a plunger into a barrel of the syringe which contains a substance for injection. The syringe carrier includes an interlock release mechanism which is configured to release the interlock such that the insertion actuator drives the syringe carrier forward.

Syringe drivers and injector devices are provided. The driver includes a housing including a port communicating with a gas chamber therein and connectable to an external air source, and a cavity that receives a syringe containing an agent. A drive piston within the housing includes a first end disposed adjacent the gas chamber and a second end including a plunger connectable to the syringe. A damping mechanism is provided within that housing that is coupled to the drive piston that includes a damper piston within a damping fluid chamber such that, when the drive piston is advanced by gas delivered into the gas chamber from the external source to deliver the agent from the syringe, damping fluid within the damping fluid chamber flows through an orifice or valve from a first region to the second region, thereby limiting movement of the drive piston.

A drive unit for an injector includes an elastomeric drive member configured to possess a first elastic potential energy in an elastically stretched state that is releasable to convert the elastic energy to a first biasing force. A selectively releasable plunger rod has a locked position maintaining the elastomeric drive member in the elastically stretched state. A trigger member is biased by a second biasing force into an interlocking position. In the interlocking position, an arm of the trigger member interlocks with a notch of the plunger rod, thereby maintaining the plunger rod in the locked position thereof. The trigger member is selectively movable against the second biasing force to an unlocking position spaced from the notch, thereby releasing the first elastic potential energy into the first biasing force to axially advance the plunger rod and thus advance the piston through the reservoir.

An auto-injector for receiving and operating a syringe, the auto-injector comprising: a housing for receiving the syringe, the housing comprising a main body and a hinged door operable into an open position and a closed position, wherein the syringe is receivable within the housing when the hinged door is in the open position; at least one charging link connected between the main body and the hinged door, wherein the connection of the charging link to the main body and/or the connection of the charging link to the hinged door is a slidable connection configured to slide on opening and closing of the hinged door and configured to couple to the at least one drive spring for priming thereof on opening and/or closing of the hinged door, the at least one drive spring being configured on activation of the auto-injector to drive a plunger driver forward within the auto-injector to operate the syringe received within the auto-injector.

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 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.

The device relates to medical technology, and more particularly to devices for intramuscular and subcutaneous injection. The present automatic injector for medical syringes consists of a housing, a holder for a syringe, a piston follower, a syringe lifting mechanism, a firing button, a lifting spring, a spring for inserting the needle, a spring for expressing the injectable fluid, a safety lock and a mechanical dynamic brake member in the form of a damping mechanism. The technical result is that of increasing the operating efficiency of the device and of reducing sensations of pain from rapid drug delivery during an injection.

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 assembly for advancing a piston through a rotationally fixed cartridge includes a rotatable, axially fixed first member and an axially movable, rotatable second member connected thereto via a threaded connection and connectable to the piston. A friction pad is rotationally fixedly connected with the second member and includes first and second sets of fingers extending radially outwardly from a central disk. Both the first and second sets of fingers are configured to contact an interior side wall of the cartridge. The first set of fingers are angled toward a first rotational direction and are configured to wedge the friction pad between the side wall and the second member upon rotation of the first member in the first direction, thereby substantially preventing rotation in the first direction. The second set of fingers are angled toward a second rotational direction and are configured to substantially prevent rotation in the second direction.