Drive mechanism for a medication delivery device and medication delivery device
First Claim
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1. A drive mechanism for a medication delivery device, comprising:
- a body having a proximal end and a distal end,a piston rod arranged within the body along an axis of rotation,a drive member arranged within the body, the drive member being rotationally coupled with the piston rod with respect to the axis of rotation,the piston rod configured for both a helical movement and a separate axial movement without rotation with respect to the body, the helical movement of the piston rod comprising a rotation around the axis of rotation and a simultaneous shift along the axis of rotation,the piston rod comprising a guide track, the guide track comprising a helical element and an axial element, anda guide element arranged within the body, the guide element being fixed relatively to the body, whereinthe guide element is coupled to the guide track in such a manner as to guide both the helical movement and the separate axial movement without rotation of the piston rod, and wherein,when the guide element is coupled to the helical element and is rotationally fixed relative to the body during medication delivery, the guide element guides the helical movement of the piston rod, and when the same guide element is coupled to the axial element, it guides the axial movement of the piston rod in a distal direction towards the distal end of the body, the axial movement preceding the helical movement.
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Abstract
A piston rod is arranged in a body and provided with a helical element and an axial element. A guide element, which is arranged in the body and fixed relatively to the body, is coupled to the helical element to guide a helical movement of the piston rod and coupled to the axial element to guide an axial movement of the piston rod. The axial movement allows a priming of the device preceding the helical movement of the piston rod.
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Citations
18 Claims
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1. A drive mechanism for a medication 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 drive member arranged within the body, the drive member being rotationally coupled with the piston rod with respect to the axis of rotation, the piston rod configured for both a helical movement and a separate axial movement without rotation with respect to the body, the helical movement of the piston rod comprising a rotation around the axis of rotation and a simultaneous shift along the axis of rotation, the piston rod comprising a guide track, the guide track comprising a helical element and an axial element, and a guide element arranged within the body, the guide element being fixed relatively to the body, wherein the guide element is coupled to the guide track in such a manner as to guide both the helical movement and the separate axial movement without rotation of the piston rod, and wherein, when the guide element is coupled to the helical element and is rotationally fixed relative to the body during medication delivery, the guide element guides the helical movement of the piston rod, and when the same guide element is coupled to the axial element, it guides the axial movement of the piston rod in a distal direction towards the distal end of the body, the axial movement preceding the helical movement. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A drive mechanism for a medication delivery device, comprising:
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a body having a proximal end and a distal end, a piston rod having a distal end and arranged within the body along an axis of rotation, a drive member arranged within the body, the drive member being rotationally coupled with the piston rod with respect to the axis of rotation, the piston rod configured for both a helical movement and a separate axial movement without rotation with respect to the body, the helical movement of the piston rod comprising a rotation around the axis of rotation and a simultaneous shift along the axis of rotation, the piston rod comprising a guide track comprising a helical element and an axial element, a guide element arranged within the body, the guide element being rotationally fixed relative to the body during medication delivery, wherein the guide element is coupled to the guide track in such a manner as to guide the movement of the piston rod, a stop member arranged within the body and being rotationally coupled with the body, a drive sleeve arranged within the body on a side of the drive member facing the proximal end, the drive sleeve being rotatable with respect to the body around the axis of rotation, and a first gear coupling the drive member and the stop member rotationally when the drive sleeve is rotated in a first sense of rotation around the axis of rotation. - View Dependent Claims (15, 16, 17)
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18. A drive mechanism for a medication 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, the piston rod having a distal end, a drive member arranged within the body, the drive member being rotationally coupled with the piston rod with respect to the axis of rotation, the piston rod being helically movable with respect to the body, the helical movement of the piston rod comprising a rotation around the axis of rotation and a simultaneous shift along the axis of rotation, the piston rod comprising a guide track, the guide track comprising a helical element and an axial element, and a guide element arranged within the body, the guide element being fixed relatively to the body, wherein the guide element is rotationally fixed relative to the body during medication delivery and is coupled to the guide track in such a manner as to cause first the axial movement without the helical movement followed by the helical movement of the piston rod, and wherein, the helical element of the guide track is arranged further away from the distal end than the axial element of the guide track.
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Specification