Drive mechanism for an injection device
First Claim
1. A drive mechanism for an injection device in which piston means is selectively driven to expel medicament from within a medicament cartridge, the drive mechanism controlling movement of the piston means and comprising:
- a housing;
a shuttle located for movement within the housing along a longitudinal axis between a first position and a second position;
drive means for driving the shuttle to move within the housing; and
a gear component located within the housing and arranged for rotation about the longitudinal axis, the gear component being associated with the piston means and cooperating with the shuttle such that movement of the shuttle between each of the first and the second positions causes rotation of the gear component and movement of the piston means.
2 Assignments
0 Petitions
Accused Products
Abstract
A drive mechanism for an injection device is disclosed in which piston means 306 are selectively driven to expel medicament from within a medicament cartridge 40. A drive mechanism for controlling the movement of the piston means is described comprising a housing 302, a shuttle 300 located for movement within the housing 302 along a longitudinal axis between a first position and a second position, and drive means to move the shuttle 300 within the housing 302. A gear component 304 is located within the housing 302 for rotation about the longitudinal axis and associated with the piston means 306, movement of the shuttle 300 between each of the first and the second positions causing movement of the piston means 306.
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Citations
8 Claims
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1. A drive mechanism for an injection device in which piston means is selectively driven to expel medicament from within a medicament cartridge, the drive mechanism controlling movement of the piston means and comprising:
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a housing; a shuttle located for movement within the housing along a longitudinal axis between a first position and a second position; drive means for driving the shuttle to move within the housing; and a gear component located within the housing and arranged for rotation about the longitudinal axis, the gear component being associated with the piston means and cooperating with the shuttle such that movement of the shuttle between each of the first and the second positions causes rotation of the gear component and movement of the piston means. - View Dependent Claims (2, 3, 4)
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5. A drive mechanism of a drug delivery device, the drive mechanism comprising:
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a housing; a drive shaft projecting from the housing and having a longitudinal axis, the drive shaft being supported for rotation within the housing about the longitudinal axis; a gear component located coaxial with the drive shaft within the housing and arranged for rotation about the longitudinal axis, wherein rotation of the gear component transmits rotational drive to the drive shaft; a shuttle located within the housing for movement between a first position and a second position along the longitudinal axis, and which engages the gear component at least one of the first position and the second position so as to cause rotation of the gear component; and drive means that drives the shuttle to move between the first position and the second position.
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6. A drive mechanism of a drug delivery device, the drive mechanism comprising:
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a housing; a drive shaft projecting from the housing and having a longitudinal axis, the drive shaft being supported within the housing for axial movement along the longitudinal axis; a gear component located coaxial with the drive shaft within the housing, and arranged for rotation about the longitudinal axis, where rotation of the gear component transmits axial drive to the drive shaft; a shuttle located within the housing for movement between a first position and a second position along the longitudinal axis, and which engages the gear component at least one of the first position and the second position so as to cause rotation of the gear component; and drive means that drives the shuttle to move between the first position and the second position.
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7. A drug delivery device that receives a medicament cartridge for delivery of medicament from within the medicament cartridge, the drug delivery device comprising:
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a piston selectively driven within the medicament cartridge to expel medicament from the medicament cartridge; and a drive mechanism that drives the piston, the drive mechanism comprising; a housing; a drive shaft projecting from the housing and having a longitudinal axis, the drive shaft being supported for rotation within the housing about the longitudinal axis to drive the piston; a gear component located coaxial with the drive shaft within the housing and arranged for rotation about the longitudinal axis, where rotation of the gear component transmits rotatational drive to the drive shaft; a shuttle located within the housing for movement between a first position and a second position along the longitudinal axis, and which engages the gear component at least one of the first position and the second position so as to cause rotation of the gear component; and drive means that drives the shuttle between the first position and the second position.
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8. A drug delivery device that receives a medicament cartridge for delivery of medicament from within the medicament cartridge, the drug delivery device comprising:
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a piston selectively driven within the medicament cartridge to expel medicament from the medicament cartridge; and a drive mechanism that drives the piston, the drive mechanism comprising; a housing; a drive shaft projecting from the housing and having a longitudinal axis, the drive shaft being supported for axial movement in the housing, along the longitudinal axis, to drive the piston; a gear component located coaxial with the drive shaft within the housing and arranged for rotation about the longitudinal axis, where rotation of the gear component transmits axial drive to the drive shaft; a shuttle located within the housing for movement between a first position and a second position along the longitudinal axis, and which engages the gear component at least one of the first position and the second position so as to cause rotation of the gear component; and drive means that drives the shuttle between the first position and the second position.
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Specification