Relating to drive mechanisms suitable for use in drug delivery devices
DC CAFCFirst Claim
1. A drive mechanism for use in a drug delivery device comprising:
- a housing;
a dose dial sleeve threadedly engaged with the housing;
a drive sleeve releasably connected to the dose dial sleeve so as to allow coupling and decoupling of the drive sleeve and dose dial sleeve, wherein the dose dial sleeve is rotatable with respect to the drive sleeve when the dose dial sleeve and drive sleeve are decoupled;
a piston rod engaged with the drive sleeve; and
a clutch located between the dose dial sleeve and the drive sleeve, where the clutch is biased distally in a dose setting position.
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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; a dose dial sleeve threadedly engaged with the housing; a drive sleeve releasably connected to the dose dial sleeve so as to allow coupling and decoupling of the drive sleeve and dose dial sleeve, wherein the dose dial sleeve is rotatable with respect to the drive sleeve when the dose dial sleeve and drive sleeve are decoupled; a piston rod engaged with the drive sleeve; and a clutch located between the dose dial sleeve and the drive sleeve, where the clutch is biased distally in a dose setting position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification