DOSING SYSTEM FOR AN INJECTION DEVICE, AND INJECTION DEVICE

摘要

The invention relates to a dosing system for an injection device, comprising a toothed threaded rod, a toothed rod that is torsion-proof relative to the toothed threaded rod and supports teeth along an axial section or part, and a dosing sleeve which has at least one engaging element that can engage into teeth of the toothed rod in order to allow a relative rotational movement in one direction and block a relative rotational movement in the opposite direction. The toothed rod is coupled to the dosing element so as to be axially torsion-proof. The invention also relates to a method for adjusting a dose of a substance that is to be discharged from an injection device. In said method, the size or amount of the substance to be discharged is adjusted by rotating the dosing element. A toothed rod is torsion-proof relative to the dosing element in a direction extending against the dosing or adjusting movement such that the toothed rod can be entrained by or rotated along with the dosing element during reverse rotation. A toothed threaded rod is torsion-proof relative to the toothed rod in order to transmit the rotation of the dosing element to the toothed threaded rod via the toothed rod, said toothed threaded rod being axially moved relative to the injection device in order for the substance to be discharged in a dosed manner.