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.
31 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