INJECTION DEVICE

• US 20180228973A1
• Filed: 03/30/2018
• Published: 08/16/2018
• Est. Priority Date: 09/30/2015
• Status: Active Grant

• Current Assignee: Haselmeier AG (Sulzer AG)
• Original Assignee: Haselmeier AG (Sulzer AG)
• Inventors: Keitel, Joachim
• Granted Patent: US 10,639,426 B2
• Time in Patent Office: Days
• CPC Class Codes: A61M 2005/3126 Specific display means related to dosing
• CPC Class Codes: A61M 2205/581 by audible feedback
• CPC Class Codes: A61M 2205/582 by tactile feedback
• CPC Class Codes: A61M 2205/583 by visual feedback
• CPC Class Codes: A61M 2205/586 Ergonomic details therefor, e.g. specific ergonomics for left or right-handed users
• CPC Class Codes: A61M 5/20 Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically A61M5/142 , A61M5/46 take precedence; hypodermic projectiles F42B12/54
• 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 5/31535 Means improving security or handling thereof, e.g. blocking means, means preventing insufficient dosing, means allowing correction of overset dose
• 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 5/3157 Means providing feedback signals when administration is completed A61M5/20 takes precedence
• CPC Class Codes: A61M 5/31583 based on rotational translation, i.e. movement of piston rod is caused by relative rotation between the user activated actuator and the piston rod
• CPC Class Codes: A61M 5/482 Varying injection pressure, e.g. by varying speed of injection

Abstract

An injection device for automatically squeezing out a dosage of injection liquid from a container. The injection device including a housing defining a longitudinal central axis; a first component; a second component; wherein the first and second component move relative to one another when the liquid is squeezed out; a spring configured to at least partially release stored energy to squeeze out the dosage; a setting device to set a rate at which the liquid is squeezed out; the setting device influencing the energy required for moving the second component relative to the first; the first component, when squeezing out liquid, is guided in the housing so as to be movable in the direction of the axis and to be rotationally fixed; and, the second component, when squeezing out liquid, is mounted relative to the housing so as to be rotatable and rotationally fixed in the direction of the axis.

Claims

1. An injection device for automatically squeezing out a dosage of injection liquid from a container thereof, the injection device comprising:

said container configured to hold the injection liquid;

a housing defining a longitudinal central axis;

a first component;

a second component;

wherein said first component and said second component move relative to one another when the injection liquid is squeezed out;

an injection spring configured to store energy and to, when the injection liquid is squeezed out from said container, at least partially release said stored energy to cause the dosage of the injection liquid to be squeezed out from said container;

a setting device to set an injection rate at which the injection liquid is squeezed out from said container;

said setting device being configured to influence the energy required for moving said second component in relation to said first component;

said first component, when squeezing out injection liquid, is guided in said housing so as to be movable in the direction of said longitudinal central axis and so as to be rotationally fixed; and

,

said second component, when squeezing out injection liquid, is mounted in relation to said housing so as to be rotatable and so as to be rotationally fixed in the direction of said longitudinal central axis.

2. The injection device of claim 1, wherein said setting device enables a stepless setting of said injection rate.

3. The injection device of claim 1, wherein said setting device, when setting the injection rate, acts on an axial relative position of said first component and said second component.

4. The injection device of claim 1 further comprising:

a setting spring; and

,

said setting device including an operating element configured to be pretensioned by said setting spring in a direction counter to an increase in said injection rate.

5. The injection device of claim 4, wherein:

the injection device defines a proximal direction; and

,

said operating element forms said first component and, for squeezing out injection liquid, is to be displaced in said proximal direction, counter to a force exerted by said setting spring.

6. The injection device of claim 5, wherein said setting spring acts between the operating element and the housing.

7. The injection device of claim 5, wherein:

said setting spring has a first end and a second end; and

,

said setting spring acts between the operating element and said housing and is supported on said operating element via said first end and is supported on said housing via said second end.

8. The injection device of claim 1, wherein:

said setting device has a latching installation which acts between the first component and the second component; and

,

said latching installation in a first relative position of said first component and said second component has a greater force for overcoming latching than in a second relative position of said first component and said second component.

9. The injection device of claim 8, wherein:

said latching installation includes at least one latching element which interacts with at least one counter latching element;

said at least one latching element and said at least one counter latching element conjointly define a latching depth with which said at least one latching element and said at least one counter latching element overlap; and

,

said latching depth is greater in said first relative rotary position than in said second relative rotary position.

10. The injection device of claim 9, wherein:

said latching element, in a sectional view which includes said longitudinal central axis, has a latching edge;

said latching edge runs so as to be inclined in relation to said longitudinal central axis;

said counter latching element has a counter latching edge; and

,

said counter latching edge runs so as to be inclined in relation to said longitudinal central axis.

11. The injection device of claim 9, wherein:

at least one of said at least one latching element of said latching installation is part of a coupling between said first component and said second component; and

,

said coupling connects said first component and said second component in a rotationally fixed manner when setting a quantity of injection liquid to be squeezed out.

12. The injection device of claim 10, wherein:

at least one of said at least one latching element of said latching installation is part of a coupling between said first component and said second component; and

,

said coupling connects said first component and said second component in a rotationally fixed manner when setting a quantity of injection liquid to be squeezed out.

13. The injection device of claim 9, wherein a multiplicity of latching elements and counter latching elements are provided.

14. The injection device of claim 1 further comprising:

an injection sleeve which, when setting a dosage of injection liquid, moves in relation to the housing in the direction of said longitudinal central axis;

said injection spring having a first end and a second end;

said injection spring being configured as a compression coil spring; and

,

said injection spring being supported in relation to said injection sleeve via said first end and being supported in relation to said housing via said second end.