Bung for drug containing cartridges in drug delivery devices

Patent metadata

Field	Value
Publication number	US-9408974-B2
Application number	US-201013321492-A
Country	US
Kind code	B2
Filing date	May 20, 2010
Priority date	May 20, 2009
Publication date	Aug 9, 2016
Grant date	Aug 9, 2016

Abstract

The present invention relates to a bung ( 20 ) for drug containing cartridges ( 10 ) for use in drug delivery devices wherein the bung ( 20 ) has a distal end face ( 22 ), a proximal end face ( 24 ) and a lateral area ( 26 ), wherein the bung ( 20 ) comprises at least two different materials, a first material ( 30 ) covering the whole lateral area ( 26 ) of the bung ( 20 ) and a second material ( 32 ) which is at least partly arranged inside the bung ( 20 ), wherein the first material ( 30 ) has a larger compressibility than the second material ( 32 ) and wherein the whole lateral area ( 26 ) has a flat surface. Furthermore, it relates to a cartridge ( 10 ) and to a drug delivery device comprising a bung ( 20 ) as claimed.

First claim

The invention claimed is:

1. A bung for drug containing cartridges for use in drug delivery devices wherein the bung has
a distal end face,
a proximal end face
and a lateral area,
wherein the bung comprises at least two different materials, a first material covering the whole lateral area of the bung and a second material which is entirely arranged inside the first material of the bung and seamlessly covered by the first material,
wherein the first material has a larger compressibility than the second material
wherein the whole distal end face of the bung has a flat surface
wherein the whole lateral area has a flat surface, and
wherein the bung is manufactured by injection molding.

2. A bung according to claim 1 , wherein the second material comprises metal.

3. A bung according to anyone of the previous claims, wherein the second material comprises ceramic.

4. A bung according to claim 1 , wherein the second material comprises a polymer matrix.

5. A bung according to claim 1 , wherein the first material comprises rubber.

6. A bung according to claim 1 , wherein the first material arranged at the lateral area together with the shape of the bung enables the bung to seal a proximal end of a drug containing cartridge.

7. A bung according to claim 1 , wherein the first material covers the distal end face of the bung.

8. A bung according to claim 1 , wherein the first material covers the whole surface of the bung.

9. A bung according to claim 1 , wherein the bung comprises a core and a layer coating the core, wherein the layer comprises the first material and the core comprises the second material.

10. A cartridge comprising a main body portion, a shoulder portion and a bung according to claim 1 , wherein the bung is moveable along a longitudinal axis within the main body portion of the cartridge.

11. A cartridge according to claim 10 , wherein the bung abuts the shoulder portion being located at the distal end of the cartridge while expelling the last dose of the medicament from the cartridge.

12. A drug delivery device comprising a cartridge according to claim 10 and a piston rod actuating the bung.

13. A drug delivery device comprising a cartridge with a bung according to claim 11 , wherein the bung abuts the shoulder portion being located at the distal end of the cartridge while expelling the last dose of the medicament from the cartridge.

14. A bung according to claim 1 , wherein the first material has a constant and thin layer thickness.

15. A bung for drug containing cartridges for use in drug delivery devices wherein the bung has
a distal end face,
a proximal end face
and a lateral area,
wherein the bung comprises at least two different materials, a first material covering the whole lateral area of the bung and a second material which is entirely arranged inside the first material of the bung and seamlessly covered by the first material,
wherein the first material has a larger compressibility than the second material
wherein the whole distal end face of the bung has a flat surface, and
wherein the whole lateral area has a flat surface.

Assignees

• Pommereau Christian
• Liewald Anke
• Sanofi Aventis Deutschland

Inventors

• Pommereau Christian
• Liewald Anke

Classifications

• A61M5/31573

  Accuracy improving means · CPC title

• A61M5/31511 Primary

  Piston or piston-rod constructions, e.g. connection of piston with piston-rod (A61M5/5066 takes precedence) · CPC title

• A61M5/31525

  Dosing (burettes, pipettes B01L3/02) · CPC title

• A61M5/31513

  Piston constructions to improve sealing or sliding · CPC title