| 主权项 |
1. An injection device for injecting medication from a cartridge, the device comprising:
a housing, a drive member adapted to expel a dose of fluid from the reservoir, an elastic element comprising a torsion spring for storing and providing energy rotationally, a dose setting mechanism that cooperates with the elastic element, the dose setting mechanism being rotatable in a dose setting manner consisting of rotating the dose setting mechanism in a first direction to a selected set position, against a bias of the elastic element, wherein rotation of the dose setting mechanism stores energy in the elastic element for later use in expelling a drug from the reservoir, and in a second manner to reduce the size of the set dose, when necessary, the second manner consisting solely of rotating the dose setting mechanism in a second direction opposite the first direction to selectively adjust the set position to reduce the size of the set dose without expelling medication from the device, a releaseable latch adapted to retain the dose setting mechanism in the set position against the bias of the elastic element, wherein release of the latch causes the dose setting assembly to drive the drive member to thereby expel a set dose from a fluid-filled reservoir when the dose setting mechanism is used in combination therewith, the force for expelling the set dose being provided by the elastic element, wherein numbers are printed on an external surface disposed on the dose setting mechanism so that only a portion of the numbers are viewable through a window (17) on the housing during the setting of a dose, reduction of the size of a set dose, and expulsion of a dose from the fluid-filled reservoir. |
