INJECTION DEVICE

• US 20160346479A1
• Filed: 08/05/2016
• Published: 12/01/2016
• Est. Priority Date: 02/05/2014
• Status: Active Grant

• Current Assignee: Medmix Switzerland AG
• Original Assignee: Haselmeier AG (Sulzer AG)
• Inventors: Keitel, Joachim
• Granted Patent: US 10,413,674 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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 5/3146 Priming, e.g. purging, reducing backlash or clearance
• CPC Class Codes: A61M 5/31551 including axial movement of dose setting member
• CPC Class Codes: A61M 5/3156 using volume steps only adjustable in discrete intervals, i.e. individually distinct intervals
• CPC Class Codes: A61M 5/31585 performed by axially moving actuator, e.g. an injection button

Abstract

An injection device includes a housing, a dosing member held so as to be rotatable and fixed in the housing and an injection sleeve held so as to be rotationally fixed in relation to the housing and displaceable therein. A latching unit of the injection device is configured to act between two components thereof which, during setting of an amount of injection fluid to be dispensed, move relative to one another. A set amount of injection fluid is unequivocally assigned to each relative position of the two components.

Claims

1. An injection device defining a longitudinal center axis, a proximal direction and a distal direction, the injection device comprising:

a housing;

a dosing member held so as to be rotatable and fixed in said housing in the direction of the longitudinal center axis;

an injection sleeve held so as to be rotationally fixed in relation to said housing and displaceable in the direction of said longitudinal center axis;

said dosing member being connected to said injection sleeve via a first threaded connection;

said dosing member being configured to rotate in a first rotational direction in relation to said housing when an amount of injection fluid to be dispensed is being set;

said injection sleeve being configured to move in the distal direction because of said first threaded connection;

said dosing member being further configured to rotate in a second rotational direction counter to said first rotational direction when said amount of injection fluid to be dispensed is being pressed out;

said injection sleeve being configured to move in the proximal direction because of said first threaded connection;

a container configured to contain injection fluid;

a dosing piston configured to press injection fluid out of said container;

said dosing piston being connected to said dosing member via a second threaded connection;

said dosing piston being connected to said dosing member in a rotationally fixed manner so as to rotate conjointly therewith when said amount of injection fluid to be dispensed is being set;

said dosing piston being connected to said injection sleeve in a rotationally fixed manner when said amount of injection fluid to be dispensed is pressed out and, by virtue of said second threaded connection, is moved in the proximal direction;

a latching unit configured to act at least when said amount of injection fluid to be dispensed from said container is being set; and

,

said latching unit being configured to act between two components of the injection device which, during setting of the amount of injection fluid to be dispensed, move relative to one another, wherein a set amount of injection fluid is unequivocally assigned to each relative mutual position of the two components.

2. The injection device of claim 1, wherein said latching unit has a latching element and a counter-latching element configured to interact with said latching element in a latching position.

3. The injection device of claim 1, wherein a first one of said two components is said dosing member and a second one of said two components is said injection sleeve.

4. The injection device of claim 1, wherein a first one of said two components is said injection sleeve and a second one of said two components is said housing.

5. The injection device of claim 1 further comprising:

a first coupling;

an entrainer connected to said dosing member in a rotationally fixed manner;

a second coupling;

an operating element configured to be connectable to said entrainer in a rotationally fixed manner via said first coupling and to be connectable to said injection sleeve via said second coupling;

said operating element having a distal position and a proximal position in relation to said injection sleeve;

said operating element being configured to be connected to said entrainer in a rotationally fixed manner via said first coupling when said operating element is in said distal position;

said second coupling being open when said operating element is in said distal position so as to enable said operating element to rotate in relation to said injection sleeve;

said first coupling being configured to be open when said operating element is in said proximal position;

said operating element being configured to be rotatable in relation to said entrainer and to be connected to said injection in a rotationally fixed manner via said second coupling when said operating element is in said proximal position.

6. The injection device of claim 5, wherein:

said latching unit has a latching element and a counter-latching element configured to interact with said latching element in a latching position;

said latching unit is active when said operating element is in said distal position; and

,

said latching element and said counter latching element are configured to be disengaged from each other when said operating element is in said proximal position independent of the relative mutual position of the two components.

7. The injection device of claim 5, wherein a first one of said two components is said entrainer and a second one of said two components is said injection sleeve.

8. The injection device of claim 5, wherein said entrainer is, in the direction of the longitudinal center axis, coupled to a position of said injection sleeve.

9. The injection device of claim 2, wherein said latching element is arranged on a first one of said two components and said counter-latching element is arranged on a second one of said two components.

10. The injection device of claim 2 further comprising:

a latching part connected with one of said two components in a rotatably fixed manner and such that said latching part is displaceable relative to said one of said two components;

said latching element being arranged on said latching part; and

,

said latching element being configured to be able to engage said counter-latching element in a first axial position of said latching part and to be disengaged from said counter-latching element in a second axial position of said latching part independent of the relative mutual position of the two components.

11. The injection device of claim 10, wherein said latching part is biased in the direction of said first axial position.

12. The injection device of claim 11, wherein said latching part include at least one spring arm configured to bias said latching part in the direction of said first axial position.

13. The injection device of claim 1 further comprising a spring configured to act between said injection sleeve and said dosing member and to bias said dosing member in said second rotational direction.

14. The injection device of claim 13 further comprising:

an entrainer; and

,

said spring having a first end fixed on said injection sleeve and a second end fixed on said entrainer.

15. The injection device of claim 13 further comprising:

an entrainer;

a latching part; and

,

said spring having a first end fixed on said latching part and a second end fixed on said entrainer.