Medicament delivery devices

• US 9,339,607 B2
• Filed: 03/24/2010
• Issued: 05/17/2016
• Est. Priority Date: 03/31/2009
• Status: Active Grant

• Current Assignee: Sanofi-Aventis Deutschland GmbH (Sanofi )
• Original Assignee: Sanofi-Aventis Deutschland GmbH (Sanofi )
• Inventors: Langley, Christopher Nigel, Jones, Christopher John
• Primary Examiner(s): Schmidt, Emily
• Assistant Examiner(s): PENG, LAUREN MICHELE
• Application Number:
  US13/254,580
• Publication Number:
  US 20120179112A1
• Time in Patent Office: 2,246 Days
• Field of Search: 604/228
• US Class Current: 1/1
• CPC Class Codes: A61M 2005/14268 with a reusable and a disposable component
• CPC Class Codes: A61M 2005/14573 with a replaceable reservoir for quick connection/disconnection with a driving system
• CPC Class Codes: A61M 2005/31518 designed to reduce the overall size of an injection device, e.g. using flexible or pivotally connected chain-like rod members
• CPC Class Codes: A61M 2005/3152 including gearings to multiply or attenuate the piston displacing force
• CPC Class Codes: A61M 2205/6027 Electric-conductive bridges closing detection circuits, with or without identifying elements, e.g. resistances, zener-diodes
• CPC Class Codes: A61M 5/14244 adapted to be carried by the patient, e.g. portable on the body
• CPC Class Codes: A61M 5/14566 with a replaceable reservoir for receiving a piston rod of the pump
• CPC Class Codes: A61M 5/31511 Piston or piston-rod constructions, e.g. connection of piston with piston-rod A61M5/5066 takes precedence

Abstract

A medicament delivery device (1) comprises a housing (2) for holding a medicament cartridge (9), a piston rod (22, 24) and a drive (11, 20). The medicament cartridge (9) has a medicament outlet and a bung (13) moveable axially along the medicament cartridge for dispensing a medicament, the piston rod has a plunger (24) for moving the bung and a lead member (22) telescopically coupled to the plunger (24) that may be driven by the drive (11, 20) to extend or retract the piston rod (22, 24). Additionally, the device comprises a linkage (40) coupled between the plunger (24) and an anchorage (44) and a drive member (20) telescopically coupled to the lead member (22). The drive (11) is operative to rotate the drive member (20) to telescopically move the lead member relative to the drive member whereby the plunger is moved relative to the lead member by way of the linkage (40).

Claims

1. A medicament delivery device comprising:

a housing for holding a medicament cartridge, the medicament cartridge having a medicament outlet and a bung moveable axially along the medicament cartridge for dispensing a medicament;

a piston rod having a plunger for moving the bung, and a lead member telescopically coupled to the plunger;

a battery powered drive for telescopically extending or retracting the piston rod; and

a linkage coupled between the plunger and

an anchorage

wherein

the medicament delivery device includes

a drive member telescopically coupled to the lead member,

wherein the battery powered drive is operative to rotate the drive member to telescopically move the lead member relative to the drive member

whereby the plunger is moved relative to the lead member by way of the linkage

wherein the linkage is an elongate element acting between the housing and the plunger via a pulley, and

wherein the pulley is a wheel located on the lead member.

2. A medicament delivery device according to claim 1, wherein the linkage is flexible and inextensible.

3. A medicament delivery device according to claim 1, wherein the piston rod is retracted by a restoring force for allowing replacement of the medicament cartridge.

4. A medicament delivery device according to claim 3, wherein the restoring force is provided by a spring.

5. A medicament delivery device according to claim 4, wherein the spring is coupled between the housing and the plunger.

6. A medicament delivery device according to claim 4, wherein the spring is configured to provide an electrical connection to a sensor located on the end of the plunger for detecting contact between the plunger and the bung.

7. A medicament delivery device according to claim 4, wherein the restoring force is provided by two or more springs.

8. A medicament delivery device according to claim 1, wherein the drive member is supported by the housing.

9. A medicament delivery device according to claim 8, wherein the drive is supplied by a motor coupled to the drive member.

10. A medicament delivery device according to claim 8, wherein the drive member and the lead member are telescopically coupled by a threaded coupling, and the lead member is non-rotatably and telescopically coupled to the plunger.

11. A medicament delivery device according to claim 1, wherein the drive member and the piston rod are substantially axially aligned.

12. A medicament delivery device according to claim 1, wherein the anchorage is coupled to the housing.