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.

The present invention discloses a plunger rod (104) for use in connection with an injection syringe barrel (102). The plunger rod (104) comprises an elongated rod (114). The elongated rod (114) comprises a proximal end (107) adapted to receive an applied force along an axis (1000). It further comprises a distal end (105) adapted to transmit the applied force along the axis (1000). The plunger rod (104) is adapted to be inserted into a barrel (102) of a syringe (100) extending along the axis (1000). The plunger rod (104) is further adapted to transmit force along the axis (1000) to a plunger stopper (103) disposed within the barrel (102). The plunger rod (104) further comprises a radial spring mechanism (106, 117, 118, 119, 120), adapted to interact with an inner surface of the barrel (102).

Embodiments including an injection device having a housing with an outer surface, an inner surface, a proximal end and a distal end, and a defining a chamber extending between the proximal end and the distal end are provided herein. The device may include a plunger having a first end and a second end, the plunger being movable proximally and distally within the chamber of the housing, the plunger comprising a plunger rod extending from the first end to the second end of the plunger; and a plunger limiting mechanism configured to interface with the plunger rod, to limit the proximal movement of the plunger and prevent removal of the plunger from the housing.

In some examples, a fluid delivery device is described. The fluid deliver device includes a housing; a reservoir disposed within the housing, the fluid reservoir defining a fluid outlet at a first end of the fluid reservoir; a plunger assembly disposed within the fluid reservoir, the plunger assembly including a friction clutch; and a seal engaged with an interior surface of the fluid reservoir to prevent movement of a material within the fluid reservoir past the seal; and a motive element in communication with a first end of the plunger assembly and configured to apply a motive force on the first end of the plunger assembly towards the first end of the fluid reservoir, wherein the friction clutch is configured to apply a frictional force to the interior surface of the fluid reservoir to resist the motive force, and wherein operation of the friction clutch enables motive force to overcome the frictional force to allow the plunger assembly to translate towards the first end of the fluid reservoir.

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.

An intraocular lens injector with push control device has, in a pen-like casing (1), a front part (2) including a loading chamber (3), a tapered delivery channel (4) and a distal tip (5), a rear part including an actuator (18) comprising a coil spring (8) acting on a push rod (9) connected anteriorly to an insertion rod (19) for inserting the intraocular lens (IOL) in a patients eye, the coil spring (8) being housed on a spring-holding sleeve (10) provided with a front abutment member (11) joined to the push rod (9), and an intermediate handle part (6) on which a device for controlling the advancement of the push rod (9) is provided. The coil spring (8) has a rear end (13) with a variable longitudinal position by means of a screw and nut screw device (14) that adjusts the loading of the coil spring (8).

In an embodiment, an injection simulation device is provided including a housing defining a channel, the housing comprising a proximal end and a distal end, a plunger comprising a plunger rod body having a proximal end and a distal end and a stopper disposed at the distal end of the plunger rod, the plunger movable proximally and distally within the channel; and a friction feature associated with the housing, the friction feature for interfacing with the plunger rod, wherein the plunger moves in a distal direction relative to the housing to simulate medicament delivery and in a proximal direction to reset the injection simulation device, wherein the friction feature optionally causes differential resistance on the plunger rod, when the plunger rod moves in either the distal or proximal direction.

The present invention relates to a drive mechanism for a medicament delivery device, comprising a plunger rod (54) arranged to act on a stopper (28) arranged in a medicament container (16); a compression drive spring (58) operably connected to said plunger rod (54) and capable of applying a force on said plunger rod (54); a spring guide (78) arranged coaxial with, and radially outside, said compression drive spring (58), capable of preventing buckling of said drive spring, wherein said spring guide (78) comprises a resilient force element (86) capable of applying a force on said medicament container (16).

An injection device for injecting a composition contained in a medical container comprising: a body configured to receive the medical container in a fixed position relative to the body, spring-loaded piston rod translationally movable inside the body along a spring axis, between a proximal rest position and a distal operative position wherein the spring-loaded piston rod engages a stopper of the medical container, and a selective blocking mechanism comprising a braking member selectively tiltable relative to the piston rod between a blocking position wherein the braking member impinges on the piston rod so as to prevent any translational movement of the spring-loaded piston rod in a distal direction by a bracing effect and a releasing position wherein the braking member disengages from the piston rod so as to allow the piston rod to move towards the distal operative position under the spring force.

The invention discloses a sterile syringe (100) comprising a barrel (1) having internal surfaces (2), a plunger (3) movable within the barrel, a non-sliding seal (7) between the barrel and the plunger defining a sealed volume (8) and at least one filter (9) allowing only filtered gases to enter the sealed volume such that the syringe maintains its sterility even after several uses. The filters could be positioned on different locations on the syringe like on the non-sliding seal, the barrel, the barrel flange or the plunger handle.