Rotatable guide sleeve with spring secured to prevent excessive tensioning
View Patent ↗A dosing device for an injection device, including a dosing element moveable or rotatable in a first direction to select a dose and a guiding element for guiding a component of the injection device, the dosing element being moved or rotated relative to the guiding element to select the dose, wherein the guiding element is rotated or moved along with the dosing element when the dosing element is moved or rotated against the first direction to adjust the selected dose. A method of adjusting a dose selected by a dosing device is encompassed, the method including selecting the dose by moving or rotating a dosing element relative to a guiding element which is moved or rotated along with the dosing element during the selecting and adjusting the selected dose by moving or rotating the dosing element in an opposite direction.
1. A dose setting device for an injection device for administering a substance, the dose setting device being for setting or correcting or reducing an amount of the substance to be administered and comprising a dose setting element which can be rotated in a first direction to set a dose and rotated in an adjusting direction opposite to the first direction to correct or reduce the set dose, and a guide element for guiding a threaded rod, wherein the dose setting element is rotated relative to the guide element to set the dose, and wherein when the dose setting element is rotated in the adjusting direction opposite to the first direction to correct or reduce the set dose the guide element is also rotated in the adjusting direction opposite to the first direction, said dose setting device further comprising a coupling element coupled with the dose setting element to rotate in unison with the dose setting element in the adjusting direction, and which has an anti-rotation lock mechanism acting on one side to establish an anti-rotation lock of the coupling element to the threaded rod in the adjusting direction, whereas rotation of the coupling element relative to the threaded rod in a direction opposite the adjusting direction is possible.
2. The dose setting device as claimed in claim 1 , wherein the rod has at least one of a toothed thread, a toothed thread portion, and a toothed region.
3. The dose setting device as claimed in claim 1 , wherein the coupling element comprises a thread which can be guided in the dose setting device or the injection device.
4. The dose setting device as claimed in claim 3 , further comprising a spring tensing element coupled with at least one of the coupling element and the dose setting element to rotate in unison therewith.
5. The dose setting device as claimed in claim 4 , further comprising a spring element retained between the guide element and the spring tensing element.
6. The dose setting device as claimed in claim 5 , wherein the spring element is releasably or non-releasably connected to at least one of the guide element and the spring tensing element.
7. The dose setting device as claimed in claim 1 , wherein the guide element comprises at least one anti-rotation lock element to permit a relative rotation of the threaded rod and the guide element when the dose setting element rotates in the first direction and block the relative rotation of the threaded rod and the guide element when the dose setting element rotates in the adjusting direction.
8. The dose setting device as claimed in claim 1 , wherein the guide element has at least one anti-rotation lock element to permit a rotation of the guide element relative to the dose setting device or relative to the injection device in the adjusting direction and block the relative rotation of the guide element in an opposite direction.
9. The dose setting device as claimed in claim 1 , further comprising a trigger element by which the anti-rotation lock mechanism between the coupling element and the threaded rod can be released.