Injection device for injection of liquid

• US 6,090,080 A
• Filed: 04/10/1998
• Issued: 07/18/2000
• Est. Priority Date: 07/05/1996
• Status: Expired due to Fees

• Current Assignee: TecPharma Licensing AG (Ypsomed Holding AG)
• Original Assignee: Disetronic Licensing Ag (Roche Holding AG)
• Inventors: Burkhardt, Hans, Renggli, Christoph, Jost, Stefan
• Primary Examiner(s): Coggins, Wynn Wood
• Assistant Examiner(s): Thanh, Loan H.
• Application Number:
  US09/029,671
• Time in Patent Office: 830 Days
• Field of Search: 604/131, 604/134, 604/135, 604/181, 604/187, 604/207, 604/208, 604/209, 604/210, 604/211, 604/218, 604/220, 604/232, 604/234, 604/97, 604/98, 604/99
• US Class Current: 604/207
• 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 5/31543 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 5/31553 without axial movement of dose setting member
• CPC Class Codes: A61M 5/3158 performed by axially moving actuator operated by user, e.g. an injection button

Abstract

Injection device for injecting fluid from a fluid container equipped with a piston, comprising an actuating device having a rod-shaped driven member having a structured surface, a control button being movable in axial direction, and a hollow cylindrical counter component having a structured internal sleeve, said counter component matching the rod-shaped driven member and being coaxially arranged in relation to said driven member.

Claims

1. An injection device for injecting fluid from a fluid container equipped with a piston, comprising an actuating device having a rod-shaped driven member having a structured surface, a control button being movable in axial direction and a hollow cylindrical counter component having a structured internal sleeve, said structured sleeve engaging said structured surface of the rod-shaped driven member wherein said driven member is advanceable by said actuating device and being coaxially arranged in relation to said driven member, characterised in that the counter component is spread open by a spreader bushing allowing the driven member to shift freely therein in axial direction.

2. The injection device according to claim 1, characterised in that the counter component is opened by an axial movement of the spreader bushing.

3. The injection device according to claim 2, characterised in that the counter component comprises two shell sections provided with cams running in the tracks of the spreader bushing.

4. An injection device for injecting fluid from a fluid container equipped with a piston, comprising an actuating device having a rod-shaped driven member having a structured surface, a control button being movable in axial direction and a hollow cylindrical counter component having a structured internal sleeve, said structured sleeve engaging said structured surface of the rod-shaped driven member wherein said driven member is advanceable by said actuating device and being coaxially arranged in relation to said driven member, characterised in that the counter component comprises two shell sections and is spread open by an axial movement of a spreader bushing with a proximal area and a distal area and tracks, thereby allowing the driven member to shift freely therein in an axial direction, said shell sections provided with cams running in the tracks of the spreader bushing, said tracks of the spreader bushing vertical in the proximal area and angled in the distal area.

5. The injection device according to claim 4, characterised in that the driven member comprises threaded surfaces and level surfaces, the level surfaces being on two facing sides and apart from the threaded surfaces.

6. The injection device according to claim 5, characterised in that the surface of the driven member and the internal sleeve of the shell sections are threaded.

7. The injection device according to claim 6, characterised in that the shell sections can only be opened when the shell sections are in proximal position.

8. The injection device according to claim 7, characterised in that the spreader bushing can be connected to an unlocking slide.

9. The injection device according to claim 8, characterised in that the surface of the driven member is provided with toothed or ribbed structures and that the internal sleeve of the counter component is provided with structures corresponding thereto.