Indication mechanism for an automatic applicator, particularly for insulin

1. An indication mechanism for an automatic applicator, particularly for insulin or other liquid preparations, particularly for multiple injection administration of set doses of a medicine from an exchangeable container, comprising:

an applicator housing;

an assembly of at least two barrels arranged in the applicator housing and movably coupled to each other, wherein one barrel is an indication barrel mounted on the other barrel, the other barrel being a driving barrel, directly inside the applicator housing, the indication barrel containing a dose scale on an external surface, characterised in that the indication barrel containing the dose scale on its external surface is mounted slidingly, co-axially and lengthwise in the applicator housing, by a splined coupling, directly on an external surface of the driving barrel, without touching an internal side of the applicator housing, and the indication barrel, at a distal ending being co-axially and directly coupled to a separate pull-push control nut, the pull-push control nut being mounted rotatably on the driving barrel coaxially and lengthwise, wherein the indication barrel functions to indicate the set dose, and functions separately from the dose setting mechanism.

2. The indication mechanism according to claim 1 , characterised in that the indication barrel is mounted by the splined coupling comprising coupling grooves and coupling keys.

3. The indication mechanism according to claim 2 , wherein the splined coupling comprises bayonet keys.

4. The indication mechanism according to claim 2 , characterised in that the indication barrel is mounted slidingly between two end positions defining a working range of the indication barrel.

5. The indication mechanism according to claim 1 , characterised in that the driving barrel is mounted rotatably within the applicator housing.

6. The indication mechanism according to claim 1 , characterised in that the pull-push control nut is mounted on the driving barrel by means of a thread coupling.

7. The indication mechanism according to claim 6 , wherein the thread coupling comprises a non self-locking thread.

8. The indication mechanism according to claim 1 , characterised in that the pull-push control nut is mounted slidingly, co-axially and lengthwise on the internal side of the applicator housing by means of a key coupling.

9. The indication mechanism according claim 8 , wherein the key coupling is a splined coupling.

10. The indication mechanism according to claim 1 , characterised in that the indication barrel is coupled lengthwise to the pull-push control nut by a catch unit.

11. The indication mechanism according to claim 10 , wherein the catch unit is a circumferential catch unit comprising an indication barrel catch and a control nut catch.

12. The indication mechanism according to claim 1 , characterised in that the indication barrel is mounted on the driving barrel with its external surface situated at a predefined distance, greater than zero, from the internal surface of the applicator housing.

13. The indication mechanism according to claim 1 , characterised in that the dose scale on the external surface of the indication barrel is in the form of spirally disposed indication numerals.

14. The indication mechanism according to claim 1 , characterised in that the driving barrel is resiliently connected to a driving element.

15. The indication mechanism according to claim 14 , wherein the driving barrel is resiliently connected to the driving element with a helical spring.

16. The indication mechanism according to claim 1 , characterised in that the driving barrel is connected to a mechanism for medicine dose setting.