Drive mechanisms suitable for use in drug delivery devices
First Claim
1. An injector comprising:
- a cartridge holder;
an exterior housing connected to the cartridge holder and enclosing a dose setting and delivery mechanism comprising,a non-circular cross section piston rod;
a dose dial sleeve;
a nut having external splines;
a unidirectional coupling,the injector further comprising a dose dial grip axially fixed to a distal end of the exterior housing, where the dose dial grip rotates relative to the exterior housing and is in a clutched engagement with a drive sleeve such that during dose setting the drive sleeve and dose dial grip are rotationally fixed,wherein the unidirectional coupling allows movement of the piston rod in proximal direction and prevents movement of the piston rod in the distal direction during dose setting.
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Accused Products
Abstract
The present disclosure is directed to a dose setting mechanism that may be used with a drug delivery device. The dose setting mechanism may include an inner body having a helical thread along an outer cylindrical surface of the inner body, and a drive sleeve for driving a piston rod in an axial direction, the drive sleeve positioned within at least a portion of the inner body. The dose setting mechanism may further include a dose dial sleeve rotatably engaged with the helical thread of the inner body and a dial grip connected to the dose dial sleeve and releasably connected to the drive sleeve. Further when a dose is set, the dial grip is rotated so that both the dose dial sleeve and the drive sleeve rotate with respect to the inner body.
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Citations
10 Claims
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1. An injector comprising:
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a cartridge holder; an exterior housing connected to the cartridge holder and enclosing a dose setting and delivery mechanism comprising, a non-circular cross section piston rod; a dose dial sleeve; a nut having external splines; a unidirectional coupling, the injector further comprising a dose dial grip axially fixed to a distal end of the exterior housing, where the dose dial grip rotates relative to the exterior housing and is in a clutched engagement with a drive sleeve such that during dose setting the drive sleeve and dose dial grip are rotationally fixed, wherein the unidirectional coupling allows movement of the piston rod in proximal direction and prevents movement of the piston rod in the distal direction during dose setting. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification