INJECTION DEVICE HAVING INJECTION VOLUME ADJUSTMENT

• US 20120056019A1
• Filed: 01/22/2010
• Published: 03/08/2012
• Est. Priority Date: 03/03/2009
• Status: Active Grant

• Current Assignee: Dieter Hlze Technik-Projekte GmbH
• Original Assignee: Dieter Hlze Technik-Projekte GmbH
• Inventors: Renz, Andreas, Weber, Wilfried
• Granted Patent: US 9,233,205 B2
• Time in Patent Office: Days
• US Class Current: 239/584
• CPC Class Codes: A61M 2005/2006 Having specific accessories
• CPC Class Codes: A61M 2005/206 With automatic needle insertion
• CPC Class Codes: A61M 2005/2414 from the side
• CPC Class Codes: A61M 5/2033 Spring-loaded one-shot injectors with or without automatic needle insertion multishot dosing syringes A61M5/31525, needle insertion only A61M5/3287
• 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 5/31546 Electrically operated dose setting, e.g. input via touch screen or plus/minus buttons
• CPC Class Codes: A61M 5/31553 without axial movement of dose setting member
• CPC Class Codes: A61M 5/31563 interacting with a displaceable stop member
• CPC Class Codes: A61M 5/31573 Accuracy improving means
• CPC Class Codes: A61M 5/31591 Single dose, i.e. individually set dose administered only once from the same medicament reservoir, e.g. including single stroke limiting means
• CPC Class Codes: A61M 5/46 having means for controlling depth of insertion

Abstract

An injection device (2) comprises a housing (4) in which a receiving chamber (6) is provided for an injection mechanism (8) having an injection fluid container (10) that can be pressed out by means of an injection plunger (12). The injection device (2) further comprises an actuating device (18) that can be driven for automatically pressing out the injection fluid container (10), wherein said actuating device can be displaced between an insertion/removal position outside of the receiving chamber (6) and an injection position within the receiving chamber (6), wherein the actuating device (18) is spaced by a release distance (d) from the receiving chamber (6) in the insertion/removal position. A contact mechanism (22) is provided, by means of which the actuating device (18) can be brought into a stop position in which an actuating stop (26) of the actuating device (18) contacts the injection plunger (12) and in which an injection volume adjustment (28) is automatically actuated.

Claims

1. An injection device (2) comprising a housing (4) in which a receiving chamber (6) is provided for an injection mechanism (8) to be inserted having an injection fluid container (10) that can be expressed by means of an injection plunger (12), and

comprising an actuating device (18) that can be driven for automatically expressing the injection fluid container (10), said actuating device being capable of being displaced between an insertion/removal position outside the receiving chamber and an injection position within the receiving chamber (6),

wherein the actuating device (18) is spaced by a release distance (d) from the receiving chamber (6) in the insertion/removal position,

characterized in that a contact mechanism (22) is provided, by means of which the actuating device (18) can be brought into a stop position in which an actuating stop (26) of the actuating device (18) contacts the injection plunger (12) and in which an injection volume adjustment (28) is automatically actuated.

2. The injection apparatus according to claim 1, characterized in that the injection volume adjustment (28) limits, starting from the stop position, a stroke distance (wH;

wG) of the actuating device (18) along an injection direction (R).

3. The injection device according to claim 1, characterized in that the actuating stop (26) is held movable on the remaining actuating device (18) and the contact mechanism (22) has fixing means whereby the actuating stop (26) can be fixed in place on the remaining actuating device (18) according to the position of the injection plunger (12).

4. The injection device according to claim 3, characterized in that the injection volume adjustment (28) can be actuated via the contact mechanism (22).

5. The injection device according to claim 3, characterized in that the actuating stop (26) is formed by an actuating plunger (24) capable of being displaced on the actuating device (18) in the injection direction (R), and the fixing means on contact of the actuating

stop (26) with the injection plunger (12) create a form closure that acts opposite to the injection direction (R).

6. The injection device according to claim 1, characterized in that the contact mechanism (22) can be activated according to the position of a cover (14) of the housing (4).

7. The injection device according to claim 6, characterized in that the contact mechanism (22) has an actuating member capable of being displaced through the cover (14) that assumes a blocking position when the cover is open (14) in which it holds the fixing means and the actuating plunger (24) against a respective bias in the insertion/removal position in which the actuating plunger (24) is arranged in a rear stop position and the fixing means are released.

8. The injection device according to claim 7, characterized in that the actuating member is held on a direction change gear unit (76) that is biased into the insertion/removal position, and the cover (14) when closed presses the actuating member via the direction change gear unit (76) against a spring force (FV) into a release position in which it is spaced apart both from the actuating plunger (24) and from the locking device.

9. The injection device according to claim 1, characterized in that the contact mechanism (22) has a coupling element (40) capable of being displaced transverse to the injection direction (R), which is capable of being displaced into an end position on contact of the actuating stop (26) with the injection plunger (12) in which end position it fixes the actuating plunger (24) in place both with respect to the remaining actuating device (18) and

on a movable stop element (36) of the injection volume adjustment (28).

10. The injection device according to claim 9, characterized in that the movable stop element (36) has a toothing (38) with which a mating toothing (42) of the coupling element (40) can be brought into engagement.

11. The injection device according to claim 9, characterized in that the injection volume adjustment (28) has an adjustable end stop (30) that is arranged in the movement direction of the movable stop element (36).

12. The injection device according to claim 11, characterized in that the end stop (30) is displaceable via a set screw (32) that is accessible from outside the housing (4).

13. The injection device according to claim 1, characterized in that the injection volume adjustment (28) is formed by a control unit (54) of an electric motor (52) that is capable of being actuated by a sensor (94) with which the stop position of the actuating device (18) can be detected.

14. The injection device according to claim 13, characterized in that the injection volume adjustment (28) has a counting function whereby a number of completed revolutions of the motor (52) starting from the stop position can be set.