INJECTION DEVICE

• US 20180221587A1
• Filed: 03/30/2018
• Published: 08/09/2018
• 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 10,751,475 B2
• Time in Patent Office: Days
• CPC Class Codes: A61M 2005/2026 Semi-automatic, e.g. user activated piston is assisted by additional source of energy
• CPC Class Codes: A61M 2005/2407 from the rear
• 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 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 5/31505 Integral with the syringe barrel, i.e. connected to the barrel so as to make up a single complete piece or unit
• CPC Class Codes: A61M 5/31551 including axial movement of dose setting member
• 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
• CPC Class Codes: A61M 5/31585 performed by axially moving actuator, e.g. an injection button

Abstract

An injection device has a housing and a metering member held rotatably in the housing and fixed in the direction of a longitudinal central axis. The metering member via a threaded connection is connected to a sleeve held rotationally fixed in relation to the housing and displaceable in the direction of the axis. When setting a dosage, the metering member rotates relative to the housing, and the sleeve moves distally. When dispensing a set dosage, the sleeve moves in the proximal direction, and the metering member by virtue of the threaded connection rotates in the opposite direction. To enable an automatic injection, the device has a spring supported in relation to the injection sleeve via a first end and in relation to the housing via a second end; the spring, when squeezing out liquid, moves the sleeve proximally and on account thereof causes the set dosage to be dispensed.

Claims

1. An injection device comprising:

a housing defining a longitudinal central axis;

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

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

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

the injection device defining a distal direction and a proximal direction;

wherein said metering member, when setting a dosage of injection liquid to be squeezed out, rotates in relation to said housing and said injection sleeve by virtue of said first threaded connection moves in said distal direction;

wherein said metering member, when squeezing out a set dosage of injection liquid, rotates in the opposite direction in relation to said housing and said injection sleeve by virtue of said first threaded connection moves in said proximal direction;

a spring having a first end and a second end;

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

,

wherein said spring, when squeezing out injection liquid, moves said injection sleeve in said proximal direction and on account thereof causes the set dosage of injection liquid to be squeezed out.

2. The injection device of claim 1, wherein said spring is configured as a compression spring.

3. The injection device of claim 1, wherein said spring by way of said first end is supported on said injection sleeve and by way of said second end is supported on said housing.

4. The injection device of claim 1, wherein said metering member is disposed radially within said injection sleeve.

5. The injection device of claim 4, wherein:

said metering member has an external circumference; and

,

said spring is disposed on said external circumference of said metering member and at least partially in an annular space formed between the metering member and the injection sleeve.

6. The injection device of claim 5 further comprising:

a scale disposed on said external circumference of said metering member;

said housing having a viewing window;

said injection sleeve defining an opening which superposes said viewing window and through which said scale is visible; and

, said injection sleeve having a portion which at the maximum dosage set covers a proximal region of the viewing window.

7. The injection device of claim 6, wherein said portion which covers the proximal region of said viewing window is configured on a web of said injection sleeve which protrudes in said proximal direction.

8. The injection device of claim 7 further comprising:

a container having an injection liquid disposed therein;

the injection device defining a radial direction and a zero position;

said housing including an upper housing part; and

,

said container and said upper housing part defining a pocket therebetween in said radial direction into which said web protrudes in said zero position of the injection device.

9. The injection device of claim 7, wherein:

said housing has a housing wall on which a pivot bearing for said metering member is formed;

said housing wall defines a passage opening; and

,

said web protrudes through said passage opening in said housing wall onto a proximal side of said housing wall.

10. The injection device of claim 1, wherein said injection sleeve is disposed completely in said housing in each position of the injection device.

11. The injection device of claim 1 further comprising:

an operating element which, when setting the dosage of injection liquid to be squeezed out, is connected in a rotationally fixed manner to the metering member via a first coupling; and

,

said operating element, when squeezing out a set dosage of injection liquid, being connected to said housing in a rotationally fixed manner via a second coupling and being rotatable in relation to said metering member.

12. The injection device of claim 11, wherein said operating element, when setting the dosage, is in a distal terminal position and, in order for said first coupling to be released, is to be moved in said proximal direction.

13. The injection device of claim 1 further comprising:

a container;

a metering piston configured to squeeze out injection liquid from said container;

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

said metering piston, when setting the quantity of injection liquid to be squeezed out, is connected in a rotationally fixed manner to said metering member and rotates conjointly with said metering member; and

,

said metering piston, when squeezing out a quantity of injection liquid to be squeezed out, being connected in a rotationally fixed manner to said housing and moving in the proximal direction by virtue of said second threaded connection.