DRIVE MECHANISM FOR A DRUG DELIVERY DEVICE AND DRUG DELIVERY DEVICE
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Abstract
The drive mechanism comprises a piston rod, a dose member with a thread engaging a corresponding thread of the body to allow a helical movement of the dose member with respect to the body, a drive sleeve rotationally coupled to the dose member, and stop means provided to restrict or inhibit a movement of the drive sleeve in the proximal direction and in the distal direction with respect to the body, the drive sleeve and the piston rod being unidirectionally coupled.
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Citations
28 Claims
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1-14. -14. (canceled)
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15. A drive mechanism for a drug delivery device, comprising:
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a body having a proximal end and a distal end, a piston rod arranged within the body along an axis of rotation, a dose member having a thread, the thread engaging a corresponding thread of the body to allow a helical movement of the dose member with respect to the body, the helical movement comprising a rotation around the axis and a simultaneous shift along the axis, a drive sleeve arranged within the body, rotatable with respect to the body around the axis and rotationally coupled to the dose member, stop means provided to restrict or inhibit a movement of the drive sleeve in the proximal direction and in the distal direction with respect to the body, a stop member arranged within the body and being rotationally locked to the body with respect to the axis, a drive member arranged within the body, the drive member being rotationally locked to the piston rod and held in contact with the stop member, a first gear locking the drive member rotationally to the stop member in a first sense of rotation with respect to the body, and a second gear locking the drive member rotationally to the drive sleeve when the drive sleeve is rotated in a second sense of rotation, which is opposite to the first sense of rotation, with respect to the body. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification