Medicament delivery device

Patent metadata

Field	Value
Publication number	US-10022501-B2
Application number	US-201415028430-A
Country	US
Kind code	B2
Filing date	Oct 8, 2014
Priority date	Oct 10, 2013
Publication date	Jul 17, 2018
Grant date	Jul 17, 2018

Abstract

A medicament delivery device includes a housing, a container holder in the housing, an axially movable plunger, and an energy accumulating member adapted for displacing the plunger. The container holder is configured to accommodate a medicament container that includes a first piston arranged inside an opposite end portion of the container and a second piston arranged inside an intermediate portion of the container. The plunger includes an outer plunger rod, an inner plunger rod at least partially inside the outer plunger rod, a biassing arrangement for actuating the inner plunger rod, and a locking arrangement that, in a first state, locks the biassing arrangement in an energy-storing position and, in a second state, releases the biassing arrangement from the energy-storing position to displace the inner plunger rod into the container holder.

First claim

The invention claimed is:

1. A medicament delivery device, comprising:
a housing having proximal and distal end portions, with a longitudinal axis extending between and along the proximal and distal end portions;
a container holder arranged in the housing at the proximal end portion;
an axially movable plunger adapted to be displaced along the longitudinal axis into the container holder; and
an energy-accumulating member arranged inside the housing and adapted to displace the plunger along the longitudinal axis toward the proximal end portion;
wherein the container holder is adapted to accommodate a medicament container that is configured for attachment of a medicament delivery member at an end portion of the medicament container and that comprises a first piston sealingly and slidably arranged inside an opposite end portion of the medicament container and a second piston slidably arranged inside an intermediate portion of the medicament container; and
the axially movable plunger comprises an outer plunger rod, an inner plunger rod arranged at least partially inside the outer plunger rod, a biassing arrangement for actuating the inner plunger rod, and a locking arrangement that, in a first state, is arranged to lock the biassing arrangement in an energy-storing position and, in a second state, is arranged to release the biassing arrangement from the energy-storing position to displace the inner plunger rod along the longitudinal axis toward the proximal end portion into the container holder,
wherein the outer plunger rod is rotatable relative to the housing.

2. The medicament delivery device of claim 1 , wherein the biassing arrangement is inside the outer plunger rod at the distal end portion.

3. The medicament delivery device of claim 1 , wherein the inner plunger rod is adapted to engage the outer plunger rod when the inner plunger rod is positioned in an end position toward the proximal end portion.

4. The medicament delivery device of claim 3 , wherein the inner plunger rod comprises at least one resilient projection adapted to engage a recess in the outer plunger rod when the inner plunger rod is positioned in the end position.

5. The medicament delivery device of claim 4 , wherein the outer plunger rod includes a series of elevations and/or depressions, and the resilient projection is adapted to run in abutment along the series of elevations and/or depressions when the inner plunger rod is moved toward the end position, thereby producing an audible and/or tactile feedback to a user of the medicament delivery device.

6. The medicament delivery device of claim 1 , wherein the biassing arrangement comprises a compression spring that extends along the longitudinal axis and, in the energy-storing position, is subjected to an axial compression.

7. The medicament delivery device of claim 6 , wherein the locking arrangement comprises a compression rod that extends along the longitudinal axis, and when the locking arrangement is in the first state the compression rod engages the compression spring and the housing at the distal end portion, thereby generating the axial compression.

8. The medicament delivery device of claim 6 , wherein the inner plunger rod is adapted to engage the outer plunger rod when the inner plunger rod is positioned in an end position toward the proximal end portion.

9. The medicament delivery device of claim 6 , wherein the energy-accumulating member comprises a main torsion spring for transferring stored energy into rotational movement for displacing the plunger along the longitudinal axis toward the proximal end portion.

10. A medicament delivery device, comprising:
a housing having proximal and distal end portions, with a longitudinal axis extending between and along the proximal and distal end portions;
a container holder arranged in the housing at the proximal end portion;
an axially movable plunger adapted to be displaced along the longitudinal axis into the container holder; and
an energy-accumulating member arranged inside the housing and adapted to displace the plunger along the longitudinal axis toward the proximal end portion;
wherein the container holder is adapted to accommodate a medicament container that is configured for attachment of a medicament delivery member at an end portion of the medicament container and that comprises a first piston sealingly and slidably arranged inside an opposite end portion of the medicament container and a second piston slidably arranged inside an intermediate portion of the medicament container; and
the axially movable plunger comprises an outer plunger rod, an inner plunger rod arranged at least partially inside the outer plunger rod, a biassing arrangement for actuating the inner plunger rod, and a locking arrangement that, in a first state, is arranged to lock the biassing arrangement in an energy-storing position and, in a second state, is arranged to release the biassing arrangement from the energy-storing position to displace the inner plunger rod along the longitudinal axis toward the proximal end portion into the container holder,
wherein the energy-accumulating member comprises a main torsion spring for transferring stored energy into rotational movement for displacing the plunger along the longitudinal axis toward the proximal end portion.

11. The medicament delivery device of claim 10 , further comprising a fixed member arranged inside the housing, the fixed member having a threaded inner surface; wherein the outer plunger rod comprises a threaded outer surface; the threaded inner surface of the fixed member is configured to engage the threaded outer surface of the outer plunger rod; a first end of the main torsion spring is connected to the housing; and a second end of the main torsion spring is connected to the outer plunger rod and releasably engages the housing.

12. The medicament delivery device of claim 11 , wherein the outer plunger rod connects to the second end of the main torsion spring via a drive member, the outer plunger being slidably connected with the drive member for sliding movement of the outer plunger rod along the drive member and the longitudinal axis.

13. A medicament delivery device, comprising:
a housing having proximal and distal end portions, with a longitudinal axis extending between and along the proximal and distal end portions;
a container holder arranged in the housing at the proximal end portion;
an axially movable plunger adapted to be displaced along the longitudinal axis into the container holder; and
an energy-accumulating member arranged inside the housing and adapted to displace the plunger along the longitudinal axis toward the proximal end portion;
wherein the container holder is adapted to accommodate a medicament container that is configured for attachment of a medicament delivery member at an end portion of the medicament container and that comprises a first piston sealingly and slidably arranged inside an opposite end portion of the medicament container and a second piston slidably arranged inside an intermediate portion of the medicament container; and
the axially movable plunger comprises an outer plunger rod, an inner plunger rod arranged at least partially inside the outer plunger rod, a biassing arrangement for actuating the inner plunger rod, and a locking arrangement that, in a first state, is arranged to lock the biassing arrangement in an energy-storing position and, in a second state, is arranged to release the biassing arrangement from the energy-storing position to displace the inner plunger rod along the longitudinal axis toward the proximal end portion into the container holder,
wherein the biassing arrangemen

Assignees

• Carebay Europe Ltd
• Carebay Europe Ltd

Inventors

• Olson Stephan

Classifications

• A61M5/2448

  comprising means for injection of two or more media, e.g. by mixing · CPC title

• A61M5/3157

  Means providing feedback signals when administration is completed (A61M5/20 takes precedence) · CPC title

• A61M5/31583

  based on rotational translation, i.e. movement of piston rod is caused by relative rotation between the user activated actuator and the piston rod · CPC title

• A61M2205/582

  by tactile feedback · CPC title

• A61M2005/2013

  triggering of discharging means by contact of injector with patient body · CPC title