Back to results
US 2021/0330890 A1Published application
Injection Device
AssigneeShaily Engineering Plastics Ltd.
InventorClaus Schmidt Moeller
Life of this patent
Estimating the term…
Abstract
An injection device is disclosed wherein a dose can be set by rotating a dose setting member, whereby a push button is elevated from one end of the device a distance proportional to the set dose from a position fixed relative to the housing, and wherein the set dose can then be injected by pressing the push button back to its non-elevated position, through which motion a screw will move approximately the same distance or a smaller distance. The invention provides a method of reducing the dose force and/or the push-button movement during injection.
Claims6
An injection device comprising:
- a housing having a first thread,
- a screw having a second thread and a non-circular cross section, and
- a driver having a third thread and a fourth thread,
- wherein:
- the screw rotates during injection,
- the third thread of the driver engages the first thread of the housing and the fourth thread of the driver engages the second thread of the screw,
- the third thread and the fourth thread of the driver have the same leads and are headed in the same direction,
- during dose setting the driver rotates and moves axially while the screw does not rotate or move axially, and
- during injection the driver rotates together with the screw.
6 more elements
Dependencies are inferred from the claim text.