Training mechanism for drug delivery device

Patent metadata

Field	Value
Publication number	US-9336690-B2
Application number	US-201113989881-A
Country	US
Kind code	B2
Filing date	Dec 6, 2011
Priority date	Dec 6, 2010
Publication date	May 10, 2016
Grant date	May 10, 2016

Abstract

The present invention relates to a cartridge for a drug delivery device comprising of a body of substantially cylindrical shape, a piston slidably disposed in the body along two opposite axial directions, along a distal and along a proximal direction, and at least one friction means operably engaged with the piston to generate a pre-defined friction force between the piston and an inside wall of the body, when the piston is displaced relative to the body, wherein in response to an axial displacement of the piston relative to the body in distal direction and in proximal direction, the at least one friction means is adapted to generate respective proximal and distal friction forces that are different in magnitude.

First claim

The invention claimed is:

1. A cartridge for a drug delivery device comprising:
a body of substantially cylindrical shape,
a piston slidably disposed in the body along two opposite axial directions, along a distal and along a proximal direction,
at least one friction means operably engaged with the piston to generate a pre-defined friction force between the piston and an inside wall of the body, when the piston is displaced relative to the body,
wherein in response to an axial displacement of the piston relative to the body in distal direction and in proximal direction, the at least one friction means is adapted to generate respective proximal and distal friction forces that are different in magnitude,
wherein the friction means comprises at least one friction member slidably disposed in axial direction in at least one receptacle of the piston.

2. The cartridge according to claim 1 , wherein the axial expansion of the receptacle is larger than the axial dimension of the friction member and wherein the receptacle is open in radial direction towards the inside wall of the body.

3. The cartridge according to claim 1 , wherein the radial size of the receptacle varies in axial direction.

4. The cartridge according to claim 1 , wherein a bottom section of the receptacle extends at an angle with respect to the axial direction.

5. The cartridge according to claim 1 , wherein the receptacle comprises a distal and a proximal stop face for the friction member.

6. The cartridge according to claim 5 , wherein the bottom section extends radially outwardly from the distal stop face towards the proximal stop face.

7. The cartridge according to claim 5 , wherein the radial expansion of the distal stop face is greater than the radial dimension of the friction member and/or wherein the radial expansion of the proximal stop face is smaller than the radial dimension of the friction member.

8. The cartridge according to claim 1 , wherein the receptacle comprises an annular groove.

9. The cartridge according to claim 1 , wherein the friction member comprises an annular ring slidably disposed in the groove in axial direction.

10. A drug delivery device for dispensing of a dose of a medicinal fluid, comprising:
a housing,
a cartridge holder,
a drive mechanism, and
a cartridge according to claim 1 , wherein the cartridge is disposed in the cartridge holder and wherein the cartridge is operably engageable with the drive mechanism.

11. The drug delivery device according to claim 10 , wherein a piston rod of the drive mechanism is operably connectable with the piston of the cartridge for slidably displacing the piston in axial and/or proximal direction relative to the body of the cartridge.

12. A training device to simulate the mechanical behaviour of a drug delivery device, comprising:
a body portion of substantially cylindrical shape,
a piston slidably disposed in the body portion along two opposite axial directions, along a distal and along a proximal direction,
at least one friction means operably engaged with the piston to generate a pre-defined friction force between the piston and an inside wall of the body portion, when the piston is displaced relative to the body portion,
wherein in response to an axial displacement of the piston relative to the body portion in distal direction and in proximal direction, the at least one friction means is adapted to generate respective proximal and distal friction forces that are different in magnitude.

Assignees

• Helmer Michael
• Nober Peter
• Garthen Christoph
• Dexheimer Christian
• Schaefer Benjamin
• Sanofi Aventis Deutschland

Inventors

• Helmer Michael
• Nober Peter
• Garthen Christoph
• Dexheimer Christian
• Schaefer Benjamin

Classifications

• A61M5/31513

  Piston constructions to improve sealing or sliding · CPC title

• G09B23/285 Primary

  for injections, endoscopy, bronchoscopy, sigmoidscopy, insertion of contraceptive devices or enemas · CPC title

• G09B23/28

  for medicine · CPC title

• A61M5/31505

  Integral with the syringe barrel, i.e. connected to the barrel so as to make up a single complete piece or unit · CPC title

• A61M5/24

  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 title