Dose Setting Mechanism and Method of Setting a Dose
AssigneeSanofi-Aventis Deutschland G
InventorsDavid Moore, Joseph Butler, David Martin Leak
Life of this patent
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Abstract
A dose setting mechanism comprises a drug delivery device housing and a dual state track provided within the housing that is axially and rotationally fixed with respect to the housing. A dose dial component is positioned in the housing and rotatable during dose setting and dose delivery. A clutch is rotatable during dose setting and non-rotatable during dose delivery. A clutch plate is rotationally fixed relative to the housing; and a clutch blocker is in threaded engagement with the clutch plate and has a radial key engaged with the dual state track. The mechanism may comprise a biasing member positioned between the clutch blocker and clutch plate.
Claims14
Dose setting mechanism for a drug delivery device, the mechanism comprising:
- a drug delivery device housing;
- a dose dial component positioned at least partly in the housing and rotatable during dose setting and dose delivery,
- characterized by
- at least one dual state track within the housing that is axially and rotationally fixed with respect to the housing, which comprises a first track, a second track, and a third track;
- a clutch plate rotationally fixed relative to the housing;
- and
- a clutch blocker in threaded engagement with the clutch plate and having at least one radial key engaged with the at least one dual state track,
- wherein the radial key is engaged with the first track during dose setting until a predetermined minimum dose is dialed with the dose dial component and with the second track after a predetermined minimum dose is dialed with the dose dial component.
A method of setting at least a predetermined minimum dose of a medicament comprising the steps of
- providing a drug delivery device housing;
- axially and rotationally fixing a dual state track within the housing with respect to the housing, wherein the dual state track comprises a first track, a second track, and a third track;
- positioning a dose dial component at least partly in the housing, the dose dial component being rotatable during dose setting and dose delivery,
- providing a clutch member that is rotatable during dose setting and non-rotatable during dose delivery;
- rotationally fixing a clutch plate relative to the housing;
- engaging a clutch blocker with the clutch plate by way of a thread;
- and
- engaging a radial key of the clutch blocker with the dual state track wherein the radial key runs in the first track until a predetermined minimum dose has been dialed.
Dependencies are inferred from the claim text.