Pen type drug injection device with dose limiting nut to prevent setting of a dose higher than the amount of drug remaining
A dose setting and dose technology, applied in the field of injection devices and pen-type drug delivery devices, can solve problems such as difficult actuation
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[0120] The injection device 1 according to the invention is figure 1 shown in an exploded view. The injection device 1 comprises a cartridge holder 2, a cartridge 3 and a drive mechanism. The drive mechanism comprises an outer housing 4, an inner housing 5, a dose dial sleeve as a dial member 6, a number sleeve as a display member 7, a drive sleeve as a drive member 8, a lead screw 9, a bearing 10, a nut 11. Drive spring 12, return spring 13, dial handle 14, dose button 15 and clutch plate 16. All components are concentrically located about a common main axis of the mechanism. In more detail, the drive member 8 surrounds the lead screw 9, the torsion spring 12 surrounds the drive member 8, the dial member 6 and the inner housing 4 surround the torsion spring 12, the display member 7 surrounds the dial member 6, and the outer housing 4 surrounds the display member 7. Furthermore, the nut 11 and the clutch plate 16 are located between the drive member 8 and the dial member 6...
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