Aspects of the present invention relate to an injection device comprising a housing configured to house a syringe, an activation member, a drive mechanism configured to, upon activation by the activation member, drive the plunger driver between a first, initial, position and a second, final, position thereby to operate the syringe within the housing and a damping mechanism configured to damp movement of the plunger driver in either a forward or rearward motion. In this way, tolerances in plunger position may be accounted for. Plunger position may affect the amount of travel of the plunger driver before the plunger driver is in contact with the plunger and the plunger is in contact with the drug within the barrel. During this travel, the drive force may cause rapid acceleration of the plunger driver, which may then cause damage to the syringe or discomfort to the recipient of the injection when contact between the three elements is made. Damping of the forward motion of the plunger driver reduces or overcomes the risk of this.

A medication delivery device includes a disposable portion and a reusable portion. The disposable portion includes a therapeutic agent delivery assembly, and the therapeutic agent delivery assembly includes a needle. The therapeutic agent delivery assembly is translatable from a stowed configuration to a deployed configuration. The reusable portion includes a first rack and pinion mechanism and a second rack and pinion mechanism. The first rack and pinion mechanism is actuatable to translate the therapeutic agent delivery assembly from the stowed configuration to the deployed configuration. The second rack and pinion mechanism is actuatable to translate a plunger and thereby cause the therapeutic agent delivery assembly to deliver a therapeutic agent from the needle.

An auto injector is provided by which a fixed dose of a medicament can be injected as self-treatment, and by which needle exposure to an accessible position, injection of the medicament and retraction of the needle to an inaccessible position is automatically performed as a continuous sequence, after the auto injector is triggered. Solutions to improve the functionality of the retraction of the needle and the general experience of the use, are also provided.

A driving mechanism for driving a plunger of an auto-injector to slide relative to a reservoir of the auto-injector is provided. The driving mechanism includes a first transmission component, a driving component, a second transmission component, a third transmission component, a sliding component and a bracket. The driving component is for driving the first transmission component to rotate to drive the second transmission component to rotatably drive the third transmission component rotate together with the second transmission component, so as to drive the sliding component to slide relative to the third transmission component by the third transmission component to push the plunger to pump a drug out of the reservoir. The sliding component passes through a guiding portion of the bracket, and the guiding portion is configured to guide the sliding component to slide without any rotation. Besides, a related auto-injector is provided.

Precision low-dose, low-waste syringe configurations have a reduced diameter lumen for dispensing 0.01 ml increments of contents. Plunger and lumen configurations and a needle interface eliminate dead space. Ergonomic attachments improve the control and precision of delivery of syringes. An attachment main body includes a gripping surface to permit a user to engage the attachment and move the attachment main body, and thus the syringe plunger relative to the syringe barrel using sliding movement. Optical enhancement features are provided on the attachment to improve the readability of gradations and plunger position. The attachment may be provided with an assist feature, which may be a traction wheel mounted on the attachment body. An alternative configuration suitable for syringe contents of higher viscosity may include a pair of toothed pinion gears on a wheel and which cooperate with respective toothed racks formed on or fastened to the syringe body.

In one embodiment, a system for injecting includes a syringe body having proximal and distal ends, a syringe interior, and a syringe flange at the proximal end thereof. The system also includes an injectable fluid disposed in the syringe interior. The system further includes a stopper member disposed in the syringe interior. Moreover, the system includes a plunger member coupled to the stopper member. In addition, the system includes a finger flange removably coupled to the syringe flange, the finger flange including a proximally directed screw. The system also includes a rotatable member disposed on the proximally directed screw, the rotatable member defining a rotatable member opening through which the plunger member is disposed and having an elastic latch disposed adjacent the rotatable member opening.

Provided herein is a brake tower for a medical injection device, the brake tower having a proximal end, a distal end having a distal face, and a sidewall therebetween defining a longitudinal axis, and one or more protrusions arranged on and extending distally from the sidewall and/or the distal face. Also provided herein is a medical injection device including a brake tower.

A medication injection method where a dose set knob of a medication injection pen is rotated with respect to the housing of the medication injection pen during dose setting and dose correcting, a driver is selectively engages with the dose set knob, the driver being rotatably fixed with respect to the housing during dose setting and dose correcting, the driver is moved axially with the dose set knob during the dose setting and the dose correcting, and the driver is rotated with the dose set knob during an injection.

A modular drive train is selectively securable within a wearable injector. The drive train includes a chassis and a telescoping driving assembly mounted within the chassis. The driving assembly includes a first shaft rotatable relative to the chassis, and a second shaft connected with the first shaft and axially movable relative thereto. Rotation of the first shaft axially drives the second shaft. The chassis includes one of a bearing and an elastically expandable collar projecting axially forward into the chassis from a rear end thereof, and the first shaft includes the other of the bearing and the elastically expandable collar projecting axially rearwardly from a rear end thereof. The collar is configured to elastically snap over an interference element of the bearing, whereby engagement of the collar with the bearing axially secures the first shaft to the chassis and permits rotation of the first shaft about the bearing.

The invention relates to an automatic injector device comprising a single-use, disposable, drug delivery assembly comprising a housing and a syringe assembly located at least partially within the housing, said syringe assembly including a plunger, a pre-filled unit-dose drug containing chamber, and needle, said plunger, drug containing chamber and needle being configured and dimensioned to function as an injection syringe; a reusable motorized transmission assembly comprising a housing, a motor and transmission assembly located within the housing, said transmission assembly being configured and dimensioned to engage the plunger of said syringe in the drug delivery assembly and expel said unit dose drug from the drug containing chamber, into the needle and out of the drug delivery assembly; said single-use disposable drug delivery assembly and said reusable motorized transmission assembly are in substantial axial alignment along a longitudinal axis defined by the syringe, plunger, pre-filled unit-dose drug containing chamber, and needle.