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.

Portable pump (11) for drug infusion through a syringe (SR) removably engaged in the pump, said pump comprising an electromechanical unit (13) having a rod (15) which is longitudinally slidable within a guide member (17) and capable of exerting an axial thrust onto the plunger (SF) of the syringe engaged in the pump, wherein said rod (15) and said guide member (17) have a non-circular cross-section, whereby rotation of the rod (15) relative to the guide member (17) is prevented.

A plunger assembly of a drug solution dosage device includes a feed screw including a male thread portion and an extending portion, a first plunger including a first female thread portion, a second plunger including a nut accommodating portion, a nut member including a second female thread portion, and a base portion that guides the second plunger. The nut accommodating portion accommodates the nut member so that the nut member is non-rotatable and movable in an axial direction.

A portable auto injection apparatus with short length is provided. A portable auto injection apparatus with short length according to an embodiment of the present invention includes a syringe to store an injection solution; a piston coupled to one end of the syringe and driving to expand/contract to discharge the injection solution to an outlet formed at the other end of the syringe; a push member coupled to one end of the piston and driving the piston; and a driving unit coupled to the push member and driving the push member.

A gear-driven infusion assembly is provided which has a housing, a gear assembly coupled to the housing, a shuttle assembly slidably coupled to the housing and operably coupled to the gear assembly, and a tube enclosure connected to the housing. The tube enclosure is configured to house a primary drug closure such as a syringe. The gear assembly includes a spool assembly having a pinion gear and a drive spool. When the spring rotates the drive spool, the drive spool drives the pinion gear, and the gear assembly drives the shuttle assembly. When the gear assembly drives the shuttle assembly, the shuttle assembly slides longitudinally along the housing. The gear assembly may be spring driven such that a spring rotates the pinion gear about the drive spool. An overspeed protection device is also provided which has a spool assembly including a drive spool.

A medication delivery device is disclosed including a rack-and-pinion plunger drive system. The drive system includes an output drive having a pawled end movably coupled with the ratchet teeth of the plunger, and a pinion drive coupled between the housing, the output drive and an actuator. Actuator is longitudinally movable between dose set and delivery positions. Movement of the actuator causes rotation of the pinion drive along the rack to translate the output drive member with the pawled end that is engaged with the plunger ratchet teeth to distally advance the plunger. The device may include one or more of an end of dose mechanism to limit travel of the actuator, a load brake system to stop travel of the plunger under high input forces, a dose detection system, and a dose selector to vary the amount of dose set.

A medication delivery device is disclosed including a rack-and-pinion plunger drive system. The drive system includes an output drive having a pawled end movably coupled with the ratchet teeth of the plunger, and a pinion drive coupled between the housing, the output drive and an actuator. Actuator is longitudinally movable between dose set and delivery positions. Movement of the actuator causes rotation of the pinion drive along the rack to translate the output drive member with the pawled end that is engaged with the plunger ratchet teeth to distally advance the plunger. The device may include one or more of an end of dose mechanism to limit travel of the actuator, a load brake system to stop travel of the plunger under high input forces, a dose detection system, and a dose selector to vary the amount of dose set.

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 injection device comprising: a housing arranged to contain a medicament cartridge; a needle holder holding an injection needle; a generally tubular needle sleeve fixed with respect to the needle holder and axially movable with respect to the housing; and a gear assembly comprising a rotary gear fixed to the needle holder, a first gear rack disposed on the needle sleeve and a second gear rack disposed on the housing, wherein the gear assembly is arranged so that movement of the needle sleeve in a proximal axial direction causes movement of the needle holder in the proximal axial direction.

A gear-driven infusion assembly is provided which has a housing, a gear assembly coupled to the housing, a shuttle assembly slidably coupled to the housing and operably coupled to the gear assembly, and a tube enclosure connected to the housing. The tube enclosure is configured to house a primary drug closure. The gear assembly includes a spool assembly having a pinion gear and a drive spool. When the spring rotates the drive spool, the drive spool drives the pinion gear, and the gear assembly drives the shuttle assembly. When the gear assembly drives the shuttle assembly, the shuttle assembly slides longitudinally along the housing. The gear assembly may be spring driven such that a spring rotates the pinion gear about the drive spool. The primary drug closure may be a syringe. An overspeed protection device is also provided which has a spool assembly including a drive spool having a plurality of cams, a spring, and a pinion gear with spiral cam surfaces.