Medicament Delivery Device

• US 20120172815A1
• Filed: 03/29/2010
• Published: 07/05/2012
• Est. Priority Date: 04/01/2009
• Status: Active Grant

• Current Assignee: Shl Medical AG
• Original Assignee: SHL Group AB
• Inventors: Holmqvist, Anders
• Granted Patent: US 9,457,148 B2
• Time in Patent Office: Days
• US Class Current: 604/208
• CPC Class Codes: A61M 2005/3152 including gearings to multiply or attenuate the piston displacing force
• 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 5/31536 Blocking means to immobilize a selected dose, e.g. to administer equal doses
• CPC Class Codes: A61M 5/31555 by purely axial movement of dose setting member, e.g. during setting or filling of a syringe
• CPC Class Codes: A61M 5/31558 using scaling up or down transmissions, e.g. gearbox
• CPC Class Codes: A61M 5/31575 using scaling up or down transmissions, e.g. gearbox
• CPC Class Codes: A61M 5/31578 based on axial translation, i.e. components directly operatively associated and axially moved with plunger rod
• CPC Class Codes: A61M 5/3158 performed by axially moving actuator operated by user, e.g. an injection button

Abstract

The present invention relates to a medicament delivery device comprising an elongated housing (10, 10′) having opposite distal and proximal ends, a medicament container (18; 18′) arranged inside said housing, a medicament delivery member (16; 16′) attachable to said medicament container; a plunger rod (22; 22′) arranged to act on a stopper (20; 20′) inside said medicament container; driving means arranged to interact with said plunger rod; wherein said device further comprises an operation member (38; 38′) transversally protruding through an elongated opening (39; 39′) on the longitudinal surface of the elongated housing and interactively connected to the driving means for both setting and actuating the delivery of a dose of medicament.

Claims

1-9. -9. (canceled)

10. A medicament delivery device, comprising:

an elongated housing having opposite distal and proximal ends;

a medicament container arranged inside the housing;

a medicament delivery member arranged for attachment to the medicament container;

a plunger rod arranged to act on a stopper inside the medicament container;

a drive mechanism arranged to interact with the plunger rod; and

an operation member transversally protruding through an elongated opening on a longitudinal surface of the elongated housing and interactively connected to the drive mechanism for both setting and actuating delivery of a dose of medicament;

wherein the drive mechanism comprises;

a first elongated plate arranged in parallel to the plunger rod and comprising the operation member;

a second elongated plate arranged in parallel to the plunger rod and positioned generally opposite to the first elongated plate;

a lock member operatively connected to the plunger rod by a first one-direction locking device, such that the plunger rod is linearly and proximally displaceable but is locked against distal displacement; and

a linear movable driver operatively connected to both the first and the second elongated plates by a gear mechanism, and also operatively connected to the plunger rod by a second one-direction locking device, such that when the operation member is manually and distally displaced a certain distance corresponding to a set dose, the linearly movable driver is also distally displaced in relation to the plunger rod, and when the operation member is manually and proximally displaced, both the plunger rod and the linearly movable driver, which are locked to each other by the second one-direction locking device, are also proximally displaced.

11. The medicament delivery device of claim 10, wherein the first and the second one-direction locking devices include at least one flexible ratchet arm having a tooth-like protrusion and a longitudinally extending ratchet on the longitudinal surface of the plunger rod arranged to interact with each other.

12. The medicament delivery device of claim 11, wherein the first and second elongated plates are longitudinally slidable on a guide on the inner surface of the elongated housing.

13. The medicament delivery device of claim 11, wherein the first elongated plate is longitudinally slidable on a guide on the inner surface of the elongated housing, and the second elongated plate is fixedly attached to the inner surface of the elongated housing.

14. The medicament delivery device of claim 13, wherein the gear mechanism includes at least one first cog-wheel rotatably arranged on the linearly movable driver, and at least one longitudinally extending ratchet arranged on each of the longitudinal inner surfaces of the first and the second elongated plates;

and the at least one first cog-wheel is arranged to interact with each of the longitudinally extending ratchet.

15. The medicament delivery device of claim 14, wherein an alternative activation member is operatively connected to the first elongated plate;

and a distal end of the alternative activation member is arranged to protrude through the distal end of the housing when the alternative operation member is manually and distally displaced a certain distance corresponding to a set dose.

16. The medicament delivery device of claim 15, wherein the gear mechanism includes a first cog-wheel rotatably arranged on the linearly movable driver, a second cog-wheel rotatably arranged on the lock member, a third cog-wheel coaxially and fixedly arranged to the second cog-wheel and rotatably arranged on the lock member, a first longitudinally extending ratchet on the longitudinal inner surface of the first elongated plate, and second and third longitudinally extending ratchets on the longitudinal inner surfaces of the second elongated plate;

the first cog-wheel is arranged to interact with the first longitudinally extending ratchet and with the second longitudinally extending ratchet;

the second cog-wheel is arranged to interact with the first longitudinally extending ratchet; and

the third cog-wheel is arranged to interact with the third longitudinally extending ratchet.

17. The medicament delivery device of claim 16, wherein an alternative activation member is operatively connected to the first elongated plate;

and a distal end of the alternative activation member is arranged to protrude through the distal end of the housing when the alternative operation member is manually and distally displaced a certain distance corresponding to a set dose.

18. The medicament delivery device of claim 10, further comprising a dose limiting device releasably attached on the elongated opening on the longitudinal surface of the elongated housing.