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 comprising an inner surface having longitudinal splines;
a dose dial sleeve threadedly engaged with the housing;
a drive sleeve having an outer surface and releasably connected to the dose dial sleeve, where a proximal end of the drive sleeve comprises a distal and a proximal radially extending flange where threads are disposed on the outer surface between the flanges; and
an end of life nut threadedly engaged with the threads on the outer surface of drive sleeve between the two radially extending flanges, where the end of life nut has an outer surface configured to engage the splines on the inner surface of the housing to prevent rotation of the end of life nut relative to the housing and the drive sleeve, and where the end of life nut translates distally relative to the drive sleeve during dose setting and is axially fixed relative to the drive sleeve during dose delivery.
0 Assignments
0 Petitions
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.
13 Citations
9 Claims
-
1. A drive mechanism for use in a drug delivery device comprising:
-
a housing comprising an inner surface having longitudinal splines; a dose dial sleeve threadedly engaged with the housing; a drive sleeve having an outer surface and releasably connected to the dose dial sleeve, where a proximal end of the drive sleeve comprises a distal and a proximal radially extending flange where threads are disposed on the outer surface between the flanges; and an end of life nut threadedly engaged with the threads on the outer surface of drive sleeve between the two radially extending flanges, where the end of life nut has an outer surface configured to engage the splines on the inner surface of the housing to prevent rotation of the end of life nut relative to the housing and the drive sleeve, and where the end of life nut translates distally relative to the drive sleeve during dose setting and is axially fixed relative to the drive sleeve during dose delivery. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
Specification