Injection device with lockable dosing member

• US 20050177115A1
• Filed: 01/28/2005
• Published: 08/11/2005
• Est. Priority Date: 01/28/2004
• Status: Active Grant

• Current Assignee: TecPharma Licensing AG (Ypsomed Holding AG)
• Original Assignee: TecPharma Licensing AG (Ypsomed Holding AG)
• Inventors: Kirchhofer, Fritz, Broennimann, Lorenz
• Granted Patent: US 7,169,133 B2
• Time in Patent Office: Days
• US Class Current: 604/208
• CPC Class Codes: A61M 2005/3125 specific display means, e.g. to indicate dose setting
• 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 5/3146 Priming, e.g. purging, reducing backlash or clearance
• CPC Class Codes: A61M 5/31525 Dosing burettes, pipettes B01L3/02
• CPC Class Codes: A61M 5/31555 by purely axial movement of dose setting member, e.g. during setting or filling of a syringe
• 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
• CPC Class Codes: A61M 5/31595 Pre-defined multi-dose administration by repeated overcoming of means blocking the free advancing movement of piston rod, e.g. by tearing or de-blocking

Abstract

An injection device including a housing, a reservoir for a product to be injected, an advancing apparatus that carries out an advancing movement to discharge a selected dose of product from the reservoir, a dosing member that carries out a propulsion movement relative to the housing in a propulsion direction and a dosing movement counter to the propulsion direction, the dosing member operably coupled with the advancing apparatus such that the propulsion movement causes the advancing movement of the advancing apparatus, wherein the length of a distance determining the discharged dose is selected by the dosing movement, a first catch mechanism formed by the housing in a sleeve section that surrounds the dosing member, and a second catch mechanism formed by one of the dosing member or a separate, additional dosing catch body, wherein a catch engagement of the catch mechanisms is releasable through a rotation free dosing movement of the dosing member or the separate, additional dosing catch body.

Claims

1. An injection device, comprising:

a) a housing;

b) a reservoir taken up by or formed by the housing for a product to be injected;

c) an advancing apparatus that carries out an advancing movement in order to advance an adjusted product dose from the reservoir;

d) a dosing member that carries out a propulsion movement relative to the housing in a propulsion direction and a dosing movement counter to the propulsion direction, said dosing member coupled with the advancing apparatus such that the propulsion movement causes the advancing movement of the advancing apparatus, wherein the length of a distance determining the discharged dose, which length is covered by the dosing member during the propulsion movement, is adjusted through the dosing movement;

e) a first catch mechanism, which the housing forms in a sleeve section that surrounds the dosing member; and

f) a second catch mechanism formed by one of the dosing member or a separate, additional dosing catch body;

wherein

g) a catch engagement of the catch mechanisms is releasable by a rotation free movement dosing movement of one of the the dosing member or the separate, additional dosing catch body.

2. The injection device according to claim 1, wherein the first catch mechanism is not pliant.

3. The injection device according to claim 1, wherein the first catch mechanism forms, in a jacket of the sleeve section, at least one catch surface pointing in the propulsion direction, and, in the catch engagement, the second catch mechanism grasps behind the at least one catch surface.

4. The injection device according to claim 3, wherein the sleeve section comprises at least one perforation and a boundary wall of the perforation forms the at least one catch surface.

5. The injection device according to claim 4, wherein a proximal boundary wall of the perforation forms the at least one catch surface.

6. The injection device according to claim 1, wherein a catch element of the second catch mechanism is visible from the outside through the sleeve section of the housing.

8. The injection device according to claim 1, wherein the first catch mechanism comprises several catch surfaces arranged in a row in the propulsion direction, which surfaces can each be brought into a catch engagement with the second catch mechanism in order to be able to set different doses.

9. The injection device according to claim 8, wherein the sleeve section of the housing is provided with several cutouts arranged in a row in the propulsion direction and each one of the cutouts forms one of the catch surfaces.

10. The injection device according to claim 1, wherein the second catch mechanism is elastically pliant for the releasing of the catch engagement.

11. The injection device according to claim 10, wherein the second catch mechanism includes a flexible tongue and a catch element that projects from the flexible tongue and engages the first catch mechanism in the catch engagement.

12. The injection device according to claim 10, wherein the second catch mechanism, relative to a central longitudinal axis of the sleeve section of the housing, snaps radially outward into the catch engagement.

13. The injection device according to claim 10, wherein the second catch mechanism snaps into the catch engagement in a peripheral direction of the sleeve section of the housing.

14. The injection device according to claim 1, wherein, in the catch engagement, the dosing member can carry out a priming movement relative to the sleeve section of the housing and relative to the advancing apparatus, the distance of which priming movement is shorter by a multiple than a maximum distance of the dosing movement.

15. The injection device according to claim 1, wherein, in a first dose position of the dosing member, in which a catch element of the second catch mechanism grasps behind a catch surface, pointing in the propulsion direction, of the first catch mechanism, a clear gap remains in the propulsion direction between the catch surface and the catch element, which gap is substantially smaller than a maximum distance of the dosing movement, so that the dosing member in the catch engagement can carry out a short dosing movement for a priming.

16. The injection device according to claim 1, wherein the advancing apparatus comprises a piston in the reservoir and a piston rod, the dosing member operably coupled with the piston rod.

7. The injection device according to claim 7, wherein the catch element is visible through the sleeve section only in the catch engagement.

17. An injection device comprising:

a housing, a reservoir for a product to be injected, an advancing apparatus that carries out an advancing movement to discharge a selected dose of product from the reservoir, a dosing member that carries out a propulsion movement relative to the housing in a propulsion direction and a dosing movement counter to the propulsion direction, the dosing member operably coupled with the advancing apparatus such that the propulsion movement causes the advancing movement of the advancing apparatus, wherein the length of a distance determining the discharged dose is selected by the dosing movement, a first catch mechanism formed by the housing in a sleeve section that surrounds the dosing member, and a second catch mechanism formed by one of the dosing member or a separate, additional dosing catch body, wherein a catch engagement of the catch mechanisms is releasable through a rotation free movement.