Drive Sleeve, Drug Delivery Device and Method for Assembling a Drug Delivery Device
AssigneeSanofi
InventorsWilliam Marsh, Anthony Paul Morris
Life of this patent
Estimating the term…
Abstract
The present disclosure is directed to a drive sleeve with a hollow body having a ring of crown teeth with a first outer diameter forming a clutch interface at a first end and a thread extending on an outer surface of the body. The thread has a major diameter and a minor diameter, wherein the ring of crown teeth has at least two cavities. The at least two cavities extend on the outer surface of the body from the first end to the thread and defining a second outer diameter which is smaller than the major diameter of the thread. Further, some embodiments are directed to a drug delivery device with such a drive sleeve and a method for assembling a drug delivery device
Claims16
1-15. (canceled)
A drive sleeve with a hollow body having a clutch interface at a first end of the body and a thread extending on an outer surface of the body, wherein the clutch interface comprises a ring of crown teeth with a first outer diameter, the thread has a major diameter and a minor diameter, and the ring of crown teeth has at least two cavities extending on the outer surface of the body from the first end to the thread and defining a second outer diameter which is smaller than the major diameter of the thread.
A drug delivery device for selecting and dispensing a number of user variable doses of a medicament, the device comprising:
- a drive sleeve with a hollow body having a clutch interface at a first end of the body and a thread extending on an outer surface of the body, wherein the clutch interface comprises a ring of crown teeth with a first outer diameter, the thread has a major diameter and a minor diameter, and the ring of crown teeth has at least two cavities extending on the outer surface of the body from the first end to the thread and defining a second outer diameter which is smaller than the major diameter of the thread,
- a housing,
- a dose setting member located within the housing,
- a piston rod engaging the drive sleeve,
- a clutch having a further a ring of crown teeth for rotationally coupling and de-coupling the drive sleeve and the dose setting member, and
- a nut having at least one helical inner rib for engaging the thread of the drive sleeve, wherein the width of the helical inner rib is equal to or smaller than the width of one of the cavities.
A method for assembling a drug delivery device for selecting and dispensing a number of user variable doses of medicament, comprising:
- providing a drive sleeve with a hollow body having a clutch interface at a first end of the body and a thread extending on an outer surface of the body, wherein the clutch interface comprises a ring of crown teeth with a first outer diameter, the thread has a major diameter and a minor diameter, and the ring of crown teeth has at least two cavities extending on the outer surface of the body from the first end to the thread and defining a second outer diameter which is smaller than the major diameter of the thread,
- a housing,
- a dose setting member located within the housing,
- a piston rod engaging the drive sleeve,
- a clutch having a further a ring of crown teeth for rotationally coupling and de-coupling the drive sleeve and the dose setting member, and
- a nut having at least one helical inner rib for engaging the thread of the drive sleeve, wherein the width of the helical inner rib is equal to or smaller than the width of one of the cavities.
- inserting the nut onto the drive sleeve in an axial movement, whereby at least one helical inner rib engages a cavity of the drive sleeve,
- performing a relative rotational movement between the drive sleeve and the nut, until the at least one helical inner rib engages a thread of the drive sleeve.
Dependencies are inferred from the claim text.