INJECTION DEVICE

• US 20130030383A1
• Filed: 09/21/2010
• Published: 01/31/2013
• Est. Priority Date: 09/26/2009
• Status: Abandoned Application

• Current Assignee: Haselmeier GmbH (Sulzer AG)
• Original Assignee: Haselmeier GmbH (Sulzer AG)
• Inventors: Keitel, Joachim
• Application Number:
  US13/393,359
• Publication Number:
  US 20130030383A1
• Time in Patent Office: Days
• US Class Current: 604/232
• 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 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 5/3129 Syringe barrels A61M5/3205 and A61M5/50 take precedence
• CPC Class Codes: A61M 5/3146 Priming, e.g. purging, reducing backlash or clearance
• CPC Class Codes: A61M 5/31551 including axial movement of dose setting member

Abstract

An injection device has a housing (34), and a carpule container (44) for receiving a carpule (50) having a fluid (52) to be injected and having a piston (48) displaceable in said carpule (50). It further has a piston rod (38) with end plate (46′) which serves, in the context of an injection, to displace the piston (48) of a carpule (50) inserted into the carpule container (44) and thereby to eject fluid (52) from the carpule (50). In order to minimize patient error in adjusting the amount of fluid medication (52) to be injected, the mechanism includes a first component (68) and a second component (92) which link (98) and interact with each other, to control when the carpule container (44) can rotate with respect to the housing (34), and to prevent creation of an axial gap (62) between end plate (46′) and piston (48).

Claims

1. An injection device,

having a housing (34),

and having a carpule container (44), associated with said housing (34), for receiving a carpule (50) having a fluid (52) to be injected,

and having a piston (48) displaceable in said carpule (50), and having a piston rod (38) which serves, in the context of an injection, to displace the piston (48) of a carpule (50) inserted into the carpule container (44) and thereby to eject fluid (52) from the carpule (50),

which piston rod (38) comprises an external thread (40) that is in engagement with an internal thread formed on a component (150) arranged in the housing (34),

further having a linkage (98) that comprises a first component (68) which is arranged rotatably but axially nondisplaceably relative to the housing (34) and is connected to the carpule container (44) during operation,

and a second component (92) which is connected nonrotatably but axially displaceably to the piston rod (38),

so that the first component (68), the second component (92), and the piston rod (38) can together rotate relative to the housing (34) as long as the piston rod (38) is not impeded from being displaced axially,

and so that, when the piston rod (38) is impeded by the piston (48) of a carpule (58) from being further displaced toward said piston (48), the first component (68) and the second component (92) move relative to one another and thereby displace the second component (92) into a position in which the possibility of a rotation of the second component (92), and of the piston rod (38) connected nonrotatably to it, relative to the housing (34) is at least impeded.

2. The injection device according to claim 1, wherein

the linkage (98) has a first ramp (104) that is provided on that side of the first component (68) which faces toward the second component (92),

and a second ramp (118) that is provided on that side of the second component (92) which faces toward the first component (68),

and which interacts with the first ramp (104),

in order, upon a relative rotation between the first component (68) and the second component (92), to modify an axial spacing (h) between the first component (69) and the second component (92) and to thereby displace the second component (92) into the position in which its rotation relative to the housing (34) is at least impeded.

3. The injection device according to claim 2, wherein

at least one of the ramps (104, 118) transitions into a portion that extends approximately perpendicular to a rotation axis of the first component (68), in order to prevent a change in the axial spacing (h) between the first component (68) and the second component (92) in a predefined range of the relative rotation between the first component (68) and second component (92).

4. The injection device according to claim 1, wherein

a spring element (142) that biases the second component (92) toward the first component (68) is provided.

5. The injection device according to claim 1, wherein

the second component (92) is implemented as a return member for returning the piston rod (38) before a change of the carpule (50).

6. The injection device according to claim 1, wherein

the first component (68) is implemented (64, 66), on its side facing toward the carpule container (44), for disengageable connection with the carpule container (44).

7. The injection device according to claim 1, wherein

the first component (68) and the second component (92) comprise with respect to each other a bearing capability (88, 90) that enables them to rotate relative to one another.

8. The injection device according to claim 1, wherein

the linkage (98) is so implemented that when, as a result of a rotation, occurring relative to the housing (34), of the first component (68), the second component (92), and the piston rod (38) together,

the latter has reached the piston (48) of a carpule (50) inserted into the carpule container (44), the second component (92) is displaceable into a locking position in which an engagement part (130) provided on the second component (92) engages into a countermember (134) connected nonrotatably to the housing (34), and

thereby blocks a further rotation of the second component (92) and of the piston rod (38) connected nonrotatably thereto.

9. The injection device according to claim 2, wherein

the ramps (104, 118) are each implemented as a (notional) thread flight.

10. The injection device according to claim 9, wherein

the thread pitch, i.e. the spacing between two adjacent flights, has a value in a range from approximately 10 mm to approximately 20 mm.

11. The injection device according to claim 10, wherein

the thread pitch has a value in a range from approximately 14 mm to approximately 16 mm.

12. The injection device according to claim 2, wherein

three ramps are provided respectively on the first component (68) and on the second component (92), the ramps of the first component (68) interacting at least partly with the ramps of the second component (92).

13. The injection device according to claim 3, wherein

three ramps are provided respectively on the first component (68) and on the second component (92), the ramps of the first component (68) interacting at least partly with the ramps of the second component (92).

14. The injection device according to claim 9, wherein

three ramps are provided respectively on the first component (68) and on the second component (92), the ramps of the first component (68) interacting at least partly with the ramps of the second component (92).

15. The injection device according to claim 10, wherein

three ramps are provided respectively on the first component (68) and on the second component (92), the ramps of the first component (68) interacting at least partly with the ramps of the second component (92).

16. The injection device according to claim 11, wherein

three ramps are provided respectively on the first component (68) and on the second component (92), the ramps of the first component (68) interacting at least partly with the ramps of the second component (92).

17. The injection device according to claim 2, wherein

the linkage (98) is so implemented that when, as a result of a rotation, occurring relative to the housing (34), of the first component (68), the second component (92), and the piston rod (38) together,

the latter has reached the piston (48) of a carpule (50) inserted into the carpule container (44), the second component (92) is displaceable into a locking position in which an engagement part (130) provided on the second component (92) engages into a countermember (134) connected nonrotatably to the housing (34), and

thereby blocks a further rotation of the second component (92) and of the piston rod (38) connected nonrotatably thereto.

18. The injection device according to claim 3, wherein

the linkage (98) is so implemented that when, as a result of a rotation, occurring relative to the housing (34), of the first component (68), the second component (92), and the piston rod (38) together,

the latter has reached the piston (48) of a carpule (50) inserted into the carpule container (44), the second component (92) is displaceable into a locking position in which an engagement part (130) provided on the second component (92) engages into a countermember (134) connected nonrotatably to the housing (34), and

thereby blocks a further rotation of the second component (92) and of the piston rod (38) connected nonrotatably thereto.

19. The injection device according to claim 4, wherein

the linkage (98) is so implemented that when, as a result of a rotation, occurring relative to the housing (34), of the first component (68), the second component (92), and the piston rod (38) together,

the latter has reached the piston (48) of a carpule (50) inserted into the carpule container (44), the second component (92) is displaceable into a locking position in which an engagement part (130) provided on the second component (92) engages into a countermember (134) connected nonrotatably to the housing (34), and

thereby blocks a further rotation of the second component (92) and of the piston rod (38) connected nonrotatably thereto.