Injection device
First Claim
1. An injection device comprising:
- a housing adapted to receive a syringe having a discharge nozzle and a dispensing piston movable in the syringe to expel the contents of the syringe through the discharge nozzle;
a drive adapted on activation to act on the syringe to advance it from a retracted position in which the discharge nozzle is contained within the housing to an extended position in which the discharge nozzle extends from the housing;
a drive coupling for extending from the drive to the dispensing piston of the syringe so as to transfer movement of the drive to the piston;
wherein the drive coupling comprises a fixed-length drive coupling and an interchangeable drive coupling and;
an interchangeable release element adapted to actuate after a predetermined amount of movement of the dispensing piston a delay mechanism in the drive acting on the fixed-length drive coupling.
1 Assignment
0 Petitions
Accused Products
Abstract
An injection device (110) comprises a housing (112) adapted to receive a syringe (116) having a discharge nozzle (118) and dispensing piston (114) movable in the syringe to expel the contents of the syringe through the discharge nozzle. There is also a drive (130) adapted to act on the syringe to advance it from a retracted position in which the discharge nozzle is contained within the housing to an extended position in which the discharge nozzle extends from housing. A drive coupling (134) extends from the drive to the dispensing piston of the syringe so as to transfer movement of the drive to the piston. The drive coupling comprises a fixed-length drive-coupling and an interchangeable drive coupling. There is also a method of manufacturing an injection device by assembling a first sub-assembly (210) and second sub-assembly (220).
302 Citations
12 Claims
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1. An injection device comprising:
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a housing adapted to receive a syringe having a discharge nozzle and a dispensing piston movable in the syringe to expel the contents of the syringe through the discharge nozzle; a drive adapted on activation to act on the syringe to advance it from a retracted position in which the discharge nozzle is contained within the housing to an extended position in which the discharge nozzle extends from the housing; a drive coupling for extending from the drive to the dispensing piston of the syringe so as to transfer movement of the drive to the piston; wherein the drive coupling comprises a fixed-length drive coupling and an interchangeable drive coupling and; an interchangeable release element adapted to actuate after a predetermined amount of movement of the dispensing piston a delay mechanism in the drive acting on the fixed-length drive coupling. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of manufacturing an injection device, comprising:
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inserting a syringe having a piston into a first sub-assembly; inserting an interchangeable drive coupling into the syringe to contact the piston; providing a second sub-assembly comprising a drive and a fixed-length drive coupling; connecting an interchangeable release element to the first sub-assembly, wherein the interchangeable release element is adapted to actuate after a predetermined amount of movement of the dispensing piston a delay mechanism in the drive acting on the fixed-length drive coupling; assembling the first sub-assembly and second sub-assembly together, wherein, on assembly, the fixed-length drive coupling and interchangeable drive coupling communicate in use to transfer movement of the drive to the piston to act on the syringe to advance it from a retracted position in which the discharge nozzle is contained within the housing to an extended position in which the discharge nozzle extends from the housing. - View Dependent Claims (10, 11, 12)
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Specification