INJECTION DEVICE

• US 20180001031A1
• Filed: 08/11/2017
• Published: 01/04/2018
• Est. Priority Date: 02/05/2014
• Status: Active Grant

• Current Assignee: Medmix Switzerland AG (Sulzer AG)
• Original Assignee: Haselmeier AG (Sulzer AG)
• Inventors: Keitel, Joachim
• Granted Patent: US 10,898,654 B2
• Time in Patent Office: Days
• CPC Class Codes: A61M 2005/2026 Semi-automatic, e.g. user activated piston is assisted by additional source of energy
• CPC Class Codes: A61M 2205/581 by audible feedback
• CPC Class Codes: A61M 2205/582 by tactile feedback
• CPC Class Codes: A61M 5/24 Ampoule syringes, i.e. syringes with needle for use in combination with replaceable ampoules or carpules, e.g. automatic ampoules or carpules A61J1/06
• CPC Class Codes: A61M 5/3155 by rotational movement of dose setting member, e.g. during setting or filling of a syringe
• CPC Class Codes: A61M 5/31551 including axial movement of dose setting member
• CPC Class Codes: A61M 5/31558 using scaling up or down transmissions, e.g. gearbox
• CPC Class Codes: A61M 5/3156 using volume steps only adjustable in discrete intervals, i.e. individually distinct intervals
• CPC Class Codes: A61M 5/3158 performed by axially moving actuator operated by user, e.g. an injection button

Abstract

An injection device includes a housing; a receptacle for injection fluid; a dosing piston to press out the injection fluid; a feed part connected to the dosing piston via a first threaded connection; a slide having a thread of a second threaded connection; and, a setting part having a thread of a third threaded connection and configured to set an amount of injection fluid to be dispensed. The setting part moves in the distal direction by virtue of the third threaded connection when the amount of injection fluid to be dispensed is being set. The setting part can move in the proximal direction when the injection fluid is pressed out. A latching unit defines a latching position of the setting part and acts between the setting part and housing. Each latching position has an unequivocal rotational position of the setting part in relation to the housing assigned thereto.

Claims

1-16. -16. (canceled)

17. A dose setting mechanism comprising;

a coupling part;

an actuating button;

a latching part; and

a setting part comprising toothing,

wherein the coupling part is rotationally engaged with the setting part,

wherein the coupling part is engaged with a corresponding internal toothing on the latching part during dose setting and dose delivery,

wherein the coupling part is rotationally fixed to the actuating button during dose delivery but not during dose setting.

18. The dose setting mechanism of claim 17, wherein the coupling part is axially fixed relative to the setting part.

19. The dose setting mechanism of claim 17, wherein the setting part comprises a first retaining part and a second retaining part.

20. The dose setting mechanism of claim 19, wherein the coupling part is provided between the first retaining part 136 and the second retaining part of the setting part.

21. The dose setting mechanism of claim 17, wherein the setting part rotates relative to both the coupling part and to the latching part during dose setting.

22. The dose setting mechanism of claim 17, wherein the setting part rotates relative to both the coupling part and to the latching part during dose delivery.

23. The dose setting mechanism of claim 17, wherein the coupling part is configured as a ring comprising an external toothing on an external circumference of the coupling part.

24. The dose setting mechanism of claim 17, wherein the setting part comprises a latching element.

25. The dose setting mechanism of claim 24, wherein the latching element of the setting part engages a plurality of latching elements located on an inner surface of the latching part.

26. The dose setting mechanism of claim 17, wherein the plurality of latching elements are located on a distal side of the latching part.

27. The dose setting mechanism of claim 26, wherein the plurality of latching elements are spaced apart from each other to define a set of finite predetermined fixed doses

such that the engagement of the latching element of the setting part with one of the plurality of latching elements sets a single fixed dose of medicament for delivery.

28. The dose setting mechanism of claim 27, wherein the set of finite predetermined fixed doses includes a lowest fixed dose and one or more higher fixed doses.

29. The dose setting mechanism of claim 25, wherein the distance between the plurality of latching elements is selected such that the one or more higher fixed doses is not equal to an even multiple of the lowest fixed dose.

30. The dose setting mechanism of claim 29, wherein the distance between the plurality of latching elements is selected such that at least one of the one or more higher fixed doses is equal to the lowest fixed dose plus a fractional amount of the lowest fixed dose.

31. The dose setting mechanism of claim 23, wherein the finite predetermined fixed doses are defined only by the number of and relative spacing between the plurality of latching elements such that replacing the latching part with a second latching part having a different arrangement of a plurality of latching elements, results in the dose setting mechanism having a different set of finite predetermined fixed doses.

32. The dose setting mechanism of claim 17, wherein the actuation button comprises toothing.

33. The dose setting mechanism of claim 32, wherein the toothing on the actuation button engage and mesh with the toothing of the setting part during dose setting.

34. The dose setting mechanism of claim 17, wherein rotation of the actuating button during dose setting causes rotation and axial movement of the setting part.

35. The dose setting mechanism of claim 34, wherein rotation of the actuating button during dose setting causes only axial movement of the latching part.

36. The dose setting mechanism of claim 17, where the coupling part is circumferentially located around an outer surface of the setting part.

37. The dose setting mechanism of claim 17, wherein the latching part is rotationally fixed to a housing of the dose setting mechanism.