INJECTION DEVICE

• US 20100168677A1
• Filed: 11/05/2007
• Published: 07/01/2010
• Est. Priority Date: 05/25/2007
• Status: Active Grant

• Current Assignee: Haselmeier AG (Sulzer AG)
• Original Assignee: Haselmeier GmbH
• Inventors: Gabriel, Jochen, Keitel, Joachim
• Granted Patent: US 8,512,296 B2
• Time in Patent Office: Days
• US Class Current: 604/189
• CPC Class Codes: A61M 2005/2407 from the rear
• CPC Class Codes: A61M 2005/2488 via rotation, e.g. threads or bayonet
• CPC Class Codes: A61M 2205/581 by audible feedback
• CPC Class Codes: A61M 2205/583 by visual 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 5/31515 Connection of piston with piston rod
• CPC Class Codes: A61M 5/31543 piston rod reset means, i.e. means for causing or facilitating retraction of piston rod to its starting position during cartridge change
• CPC Class Codes: A61M 5/31551 including axial movement of dose setting member
• CPC Class Codes: A61M 5/31575 using scaling up or down transmissions, e.g. gearbox
• CPC Class Codes: A61M 5/31585 performed by axially moving actuator, e.g. an injection button
• CPC Class Codes: A61M 5/31593 Multi-dose, i.e. individually set dose repeatedly administered from the same medicament reservoir

Abstract

An injection device (30) features a housing (42, 52) for reception of a container (34) having a fluid (32) to be injected, a first element (94) for ejecting injection fluid (32) from such a container (34), and said first element (94) has an external thread (92). A metering element (66, 88) has an internal thread (90) that is in engagement with the external thread (92) of the first element (94), and said metering element (66) is rotatable, together with the first element (94), for preselection of a desired injection dose. A coupling arrangement (K1) serves, during an injection operation, to create a nonrotatable connection between the first element (94) and the housing (42, 52) and thereby to block, during an injection operation, a rotation of the first element (94) relative to the housing (42, 52) but to enable a rotation of the metering element (66, 88) relative to the housing (42, 52).

Claims

1. An injection device comprising:

a housing (42, 52) to which a container (34) having injection fluid (32) is connectable;

a first element (94) for ejecting injection fluid (32) from such a container (34), which first element (94) is shaped with an external thread (92);

a metering element (66, 88;

166) that is arranged rotatably relative to the housing (42, 52) and has an internal thread (90) that is in engagement with the external thread (92) of the first element (94), which metering element (66, 88;

166) is rotatable, together with the first element (94), relative to the housing (42, 52) for preselection of an injection dose; and

a coupling arrangement (K1) which is implemented to block, during an injection operation, a rotation of the first element (94) relative to the housing (52) but to enable a rotation of the metering element (66, 88;

166) relative to the housing (42, 52),

so that, by means of such a rotation of the metering element (66, 88;

166) during an injection operation, an axial displacement of the first element (94) in a proximal direction, i.e. toward the patient, is enabled, in order to eject injection fluid (32) from such a container (34).

2. The injection device according to claim 1,

in which, during the preselection of an injection dose, the metering element (66, 88;

166) and the first element (94) having an external thread (92) are not rotatable relative to one another.

3. The injection device according to claim 1,

in which, during the preselection of an injection dose, the metering element (66, 88;

166) and the first element (94) comprising an external thread (92) are rotatable together relative to the housing (52).

4. The injection device according to claim 1,

in which, during an injection operation, the metering element (66, 88;

166) and the first element (94) comprising an external thread (92) are rotatable relative to one another.

5. The injection device according to claim 1,

in which the metering element (66, 88;

166) that is arranged rotatably relative to the housing (52) is arranged axially nondisplaceably in the housing (52).

6. The injection device according to claim 1,

having a coupling arrangement (98, 99) that is coupled axially displaceably, but nonrotatably, to the first element (94).

7. The injection device according to claim 1,

having a coupling arrangement (K2) that is implemented to transfer a dose-setting motion to the metering element (66) for preselection of a desired injection dose.

8. The injection device according to claim 1, in which the metering element is implemented as a sleeve (66, 88;

166).

9. The injection device according to claim 1, further comprising a coupling apparatus (K2, 146, 148, 150) that is uncoupled during an injection operation.

10. The injection device according to claim 1, wherein

the first element equipped with an external thread (92) is implemented as a plunger (94) that is equipped with an external thread (92).

11. The injection device according to claim 1, wherein

a proximal end (95) of the first element (94) is mounted rotatably in a pressure application element (96) which is implemented for the ejection of injection fluid (32) from a container (34) for such a fluid (32),

said proximal end (95) of the first element (94) being arranged in a recessed manner in the pressure application element (96).

12. The injection device according to claim 1, wherein the metering element is implemented

as a sleeve (66;

166).

13. An injection device comprising

a housing (52);

a container (34) for the reception of injection fluid (32), which container (34) is connectable to the housing (52);

a metering element (66, 88;

166) that is implemented rotatably, but not axially displaceably, relative to the housing (42, 52);

an external thread (72) associated with the metering element (66, 88;

166);

a sleeve-shaped element (116) that is implemented axially movably in the housing (52) but not rotatably relative to the housing (52) and has an internal thread (118) that is in engagement with the external thread (72) of the metering element (66, 88;

166),

in order to enable, by rotation of the metering element (66, 88;

166) relative to the housing (52), an axial displacement of the sleeve-shaped element (116) in the housing (52) and thereby the setting of an injection dose;

and a coupling arrangement (K1) that is in engagement with the sleeve-shaped element (116) during the injection operation and

is decouplable from the sleeve-shaped element (116)

for preselection of a desired injection dose.

14. The injection device according to claim 13,

in which display values (70) for the injection dose are provided on the metering element (66, 88;

166).

15. The injection device according to claim 14,

in which the display values (70) are arranged in a substantially helical configuration on the metering element (66;

166).

16. The injection device according to claim 13, further comprising

a first viewing window (54) provided in the housing (52) of the injection device;

and

a second viewing window (130) that is provided in the sleeve-shaped element (116) and is axially displaceable relative to the first viewing window (54),

in order to make visible, on the outer side (68) of the metering element (66;

166), through the first viewing window (54) and the second viewing window (130), a display value (70) for the injection dose on the outer side (68) of the metering element (66;

166).

17. The injection device according to claim 16,

in which the second viewing window (130) provided in the sleeve-shaped element (116) is dimensioned so that it corresponds substantially to an area occupied by a display value (70) for the injection dose and, with its periphery (134, 136), covers adjacent display values.

18. The injection device according to claim 16,

in which the first viewing window (54) provided in the housing (52) has the shape of an elongated opening whose longitudinal axis extends substantially parallel to a longitudinal direction of the housing (52).

19. The injection device according to claim 16,

in which the elongated opening of the first viewing window (54) provided in the housing (52) is dimensioned so that, in the proximal end position of the second viewing window (130), the minimum dose value, and in the distal end position of the second viewing window (130) the maximum dose value, is visible through the relevant viewing windows (54, 130).

20. The injection device according to claim 13,

wherein the metering element is implemented as a sleeve (66;

166).

21. (canceled)