DRIVE MECHANISMS SUITABLE FOR USE IN DRUG DELIVERY DEVICES
First Claim
1. A drive mechanism for use in a drug delivery device comprising:
- a housing having a helical thread;
a dose dial sleeve having a helical thread engaged with the helical thread of the housing;
a drive sleeve having two radially extending flanges spaced a distance apart and having an outer helical thread there between, where the drive sleeve is releasably connected to the dose dial sleeve;
a piston rod threadedly engaged with the drive sleeve; and
a clutch mechanism located between the dose dial sleeve and the drive sleeve.
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Accused Products
Abstract
A drive mechanism suitable for use in drug delivery devices is disclosed. The drive mechanism may be used with injector-type drug delivery devices, such as those permitting a user to set the delivery dose. The drive mechanism may include a housing, a dose dial sleeve, and a drive sleeve. A clutch is configured to permit rotation of the drive sleeve and the dose dial sleeve with respect to the housing when the dose dial sleeve and drive sleeve are coupled through the clutch. Conversely, when the dose dial sleeve and drive sleeve are in a de-coupled state, rotation of the dose dial sleeve with respect to the housing is permitted and rotation of the drive sleeve with respect to the housing is prevented. In the de-coupled state, axial movement of the drive sleeve transfers force in a longitudinal direction for actuation of a drug delivery device.
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Citations
10 Claims
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1. A drive mechanism for use in a drug delivery device comprising:
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a housing having a helical thread; a dose dial sleeve having a helical thread engaged with the helical thread of the housing; a drive sleeve having two radially extending flanges spaced a distance apart and having an outer helical thread there between, where the drive sleeve is releasably connected to the dose dial sleeve; a piston rod threadedly engaged with the drive sleeve; and a clutch mechanism located between the dose dial sleeve and the drive sleeve.
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2. A drive mechanism for use in a drug delivery device is provided comprising:
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a housing having a helical thread, a dose dial sleeve having a helical thread engaged with the helical thread of the housing; a drive sleeve releasably connected to the dose dial sleeve; and a clutch mechanism located between the dose dial sleeve and the drive sleeve; wherein the clutch mechanism is configured such that, a) when the dose dial sleeve and the drive sleeve are coupled, both are allowed to rotate with respect to the housing; and b) when the dose dial sleeve and the drive sleeve are de-coupled, rotation of the dose dial sleeve with respect to the housing is allowed, while rotation of the drive sleeve with respect to the housing is prevented, whereby axial movement of the drive sleeve is allowed so that a force is transferred in the longitudinal direction to the a proximal end of the drug delivery device. - View Dependent Claims (3, 4, 5, 6, 7)
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8. A drive mechanism for use in a drug delivery device comprising:
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a) a main housing having a first end and a second end, a helical thread having a first lead, an insert rotationally fixed to the housing having a thread with a second lead; b) a dose dial sleeve having a helical thread engaged with the housing helical thread configured so that during dose selection the dose dial sleeve rotates and extends axially from the second end of the housing and during dose delivery rotates and moves axially back into the housing; c) a tubular drive sleeve having an internal surface and an outer surface having disposed thereon an intermediate thread, where the drive sleeve is releasably connected to the dose dial sleeve through a clutch located between the dose dial sleeve and the drive sleeve and where the drive sleeve has an internal helical thread having the same lead as the first lead; d) a piston rod having a first external thread and a second external thread, where the first external thread has a second lead that is different and of opposite disposition than the first lead and is threadedly engaged with the insert, and where the second external thread is threadedly engaged with the internal thread of the drive sleeve; wherein, when the dose dial sleeve and the drive sleeve are coupled during dose section, both are allowed to rotate with respect to both the housing and the piston rod; and when the dose dial sleeve and the drive sleeve are de-coupled during dose delivery, rotation of the dose dial sleeve with respect to the housing is allowed, while rotation of the drive sleeve with respect to the housing is prevented, whereby axial movement of the drive sleeve is allowed causing the piston rod to rotate about the first external thread and moving axially through the insert so that a force is transferred from the piston rod to a cartridge piston. - View Dependent Claims (9, 10)
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Specification