AUTOMATIC INJECTION DEVICE FOR ADMINISTERING A FIXED DOSE

• US 20190314577A1
• Filed: 06/27/2019
• Published: 10/17/2019
• Est. Priority Date: 08/11/2008
• Status: Active Grant

• Current Assignee: Ypsomed AG (Ypsomed Holding AG)
• Original Assignee: TecPharma Licensing AG (Ypsomed Holding AG)
• Inventors: Hirschel, Jurg, Moser, Ulrich, Tschirren, Markus, Vogt, Patrick
• Granted Patent: US 11,964,132 B2
• Time in Patent Office: Days
• CPC Class Codes: A61M 2005/2013 triggering of discharging means by contact of injector with patient body
• 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 5/326 Fully automatic sleeve extension, i.e. in which triggering of the sleeve does not require a deliberate action by the user
• CPC Class Codes: Y10T 29/49826 Assembling or joining

Abstract

An injection device for administering a substance, including a housing, a plunger rod which can be moved relative to the housing, at least one retaining element associated with the rod to hold the rod relative to the housing, and a displaceable locking sleeve which can be displaced relative to the housing from one position in which the sleeve holds the at least one retaining element in a retaining position to a second position in which the at least one retaining element is released.

Claims

1. An injection device for administering a substance, comprising

a housing;

a syringe with a needle, the syringe fixedly connected to the housing for manual injection by pushing the injection device onto or against a surface, the needle being surrounded by a protective sleeve in a first position of the protective sleeve and exposed from the protective sleeve when the protective sleeve is pushed back to a second position of the protective sleeve;

a plunger rod;

at least one retaining element associated with the plunger rod for retaining the plunger rod relative to the housing;

a displaceable lock comprising the protective sleeve, which protective sleeve is able to slide inside the housing and which displaceable lock holds, in the first position of the protective sleeve, the at least one retaining element in a retained position relative to the housing and which releases, in the second position of the protective sleeve, the at least one retaining element; and

further retaining elements that, in a retaining position of the further retaining elements, generate an initial resistance when the protective sleeve is urged towards the second position by a user pushing the injection device onto or against the surface, and that subsequently release the protective sleeve so that the protective sleeve can slide abruptly into the injection device.

2. The injection device as claimed in claim 1, wherein the protective sleeve comprises two axially extending arms.

3. The injection device as claimed in claim 1, wherein the further retaining elements include radially projecting lugs and co-operating recesses.

4. The injection device as claimed in claim 3, wherein the radially projecting lugs project radially outward.

5. The injection device as claimed in claim 1, wherein the further retaining elements are associated with the protective sleeve and locate in a co-operating groove or recess of the housing.

6. The injection device as claimed in claim 5, wherein the further retaining elements comprise lugs projecting radially outward.

7. The injection device as claimed in claim 1, further comprising an injection spring which is supported against the housing or against an element connected to the housing and which pushes the plunger rod in a distal direction.

8. The injection device as claimed in claim 1, further comprising a protective sleeve spring which is supported against the housing of the injection device or an element connected to the housing and which pushes the protective sleeve in the distal direction.

9. The injection device as claimed in claim 8, wherein, upon removal of the injection device from the surface and movement of the protective sleeve by the protective sleeve spring into a front-most position, a resilient element snaps over an end of a locking element and generates a click, indicating a locked state of the injection device, and wherein in the locked state, the protective sleeve is blocked from moving.

10. The injection device as claimed in claim 1, wherein the at least one retaining element is provided on the plunger rod.

11. The injection device as claimed in claim 1, wherein the protective sleeve is mounted in the housing so that the protective sleeve is prevented from rotating.

12. The injection device as claimed in claim 1, wherein, in the second position of the protective sleeve, the displaceable lock releases the at least one retaining element to automatically trigger a dispensing operation.

13. The injection device as claimed in claim 1, wherein a first resilient element causes a first click at an end of a dispensing operation by interaction with an element of the housing.

14. The injection device as claimed in claim 13, wherein, upon removal of the injection device from the surface and movement of the protective sleeve by a protective sleeve spring into a front-most position, a second resilient element snaps over an end of a locking element and generates a second click, indicating a locked state of the injection device, and

wherein in the locked state, the protective sleeve is blocked from moving.

15. An injection device for administering a substance, comprising:

a housing;

a syringe with a needle, the syringe fixedly connected to the housing for manual injection by pushing the injection device onto or against a surface, the needle being surrounded by a protective sleeve in a first position of the protective sleeve and exposed from the protective sleeve when the protective sleeve is pushed back to a second position of the protective sleeve;

a plunger rod;

at least one retaining element associated with the plunger rod for retaining the plunger rod relative to the housing;

a displaceable lock comprising the protective sleeve, which protective sleeve is able to slide inside the housing and which displaceable lock holds, in the first position of the protective sleeve, the at least one retaining element in a retained position relative to the housing and which releases, in the second position of the protective sleeve, the at least one retaining element; and

a releasable catch connection causing a minimum opposing force to be overcome when the protective sleeve is moved into the housing.