Injection device i.e. fixed-dose pen, for dispensing substance, has inner thread, which is designed such that thread has edges for guiding different threaded rods with external threads of different pitches, where thread has two sections

摘要

The device has an inner thread (3b) for guiding a threaded rod (5), where the inner thread is designed in such a manner that it has a set of attaching edges for guiding different threaded rods with external threads of different pitches. The edges have different pitches relative to the circumferential direction of the inner thread, which has two thread sections. The thread sections are arranged and displaced at a distance to each other in the peripheral direction and/or in an axial direction of the inner thread.