Medicament delivery device with rotator retaining the plunger rod

Patent metadata

Field	Value
Publication number	US-12156992-B2
Application number	US-202117355061-A
Country	US
Kind code	B2
Filing date	Jun 22, 2021
Priority date	May 6, 2014
Publication date	Dec 3, 2024
Grant date	Dec 3, 2024

Abstract

A medicament delivery device extends along a longitudinal axis and includes: a generally tubular elongated housing having a proximal and a distal end, where the generally tubular elongated housing is arranged to accommodate a medicament container; a drive unit comprising a drive element and plunger rod operably arranged to act on the medicament container; a tubular element rotatably arranged in relation to the housing and operably arranged to the plunger rod, where the plunger rod includes at least one holding member and where the tubular element includes at least one arm extending generally transversal to the longitudinal axis of the device, wherein the at least one arm is arranged to engage the at least one holding member on the plunger rod to releasable hold the drive unit in an energy accumulated state.

First claim

The invention claimed is:

1. A medicament delivery device, comprising:
a generally tubular elongated housing having a proximal end and a distal end, wherein the generally tubular elongated housing is arranged to accommodate a medicament container;
a drive unit comprising a drive element and a plunger rod operably arranged to act on the medicament container;
a tubular element rotatably arranged in relation to the generally tubular elongated housing and operably arranged to the plunger rod, wherein the tubular element comprises a central passage through which the plunger rod extends, wherein the central passage has a generally oval shape, wherein an inner surface of the tubular element comprises at least one arm extending generally transversal to a longitudinal axis of the medicament delivery device, wherein the at least one arm is arranged to engage at least one holding member on the plunger rod to releasably hold the drive unit in an energy accumulated state; and
an activator displaceably arranged in relation to the generally tubular elongated housing and operably arranged to the tubular element such that a displacement of the activator causes the tubular element to be rotated such that the at least one arm disengages from the at least one holding member on the plunger rod whereby the drive unit is released from the energy accumulated state.

2. The medicament delivery device of claim 1 , wherein the at least one holding member of the plunger rod is at least one recess or at least one through hole or at least one slot, wherein any of the at least one recess or the at least one through hole or the at least one slot comprises a side wall that is inclined in a radial direction to facilitate positioning the at least one arm in engagement with the at least one holding member.

3. The medicament delivery device of claim 1 , wherein the generally tubular elongated housing further comprises a proximally-directed protrusion at the distal end, wherein the plunger rod further comprises a slot on a distally directed end surface of the plunger rod, wherein the slot is sized to cooperate with said proximally-directed protrusion to rotationally lock the plunger rod to the generally tubular elongated housing when the drive unit is in the energy accumulated state, and wherein the proximally-directed protrusion at the distal end of the generally tubular elongated housing is sized to disengage from the slot when the drive unit is released from the energy accumulated state.

4. The medicament delivery device of claim 1 , wherein the at least one arm is a rigid arm.

5. The medicament delivery device of claim 4 , wherein the at least one arm is axially rigid but radially flexible.

6. The medicament delivery device of claim 1 , wherein the at least one arm is arranged on a rim of the tubular element.

7. The medicament delivery device of claim 1 , wherein the tubular element is arranged coaxially outside said plunger rod.

8. The medicament delivery device of claim 1 , wherein the generally tubular elongated housing comprises a proximal housing part and a distal housing part, and wherein the plunger rod is rotationally locked to the distal housing part when the drive unit is the energy accumulated state.

9. The medicament delivery device of claim 1 , wherein the activator is slidably arranged along the longitudinal axis of the medicament delivery device between the generally tubular elongated housing and the tubular element.

10. The medicament delivery device of claim 1 , wherein the activator comprises a medicament delivery member guard which is tubular shaped, and wherein the activator protrudes a distance from the proximal end of the generally tubular elongated housing.

11. The medicament delivery device of claim 10 , wherein the tubular element comprises at least one interaction member on an outer circumferential surface of the tubular element, and wherein the at least one interaction member is arranged to cooperate with at least one activator element arranged on the activator.

12. The medicament delivery device of claim 11 , wherein the at least one interaction member is arranged inclined in relation to the longitudinal axis of the medicament delivery device.

13. The medicament delivery device of claim 12 , wherein the at least one interaction member comprises an inclined ledge, wherein the at least one activator element comprises a protrusion, wherein the protrusion interacts with the inclined ledge to rotate the tubular element when the activator is linearly displaced in relation to the generally tubular elongated housing when the medicament delivery member guard is pressed against a dose delivery site.

14. The medicament delivery device of claim 13 , wherein the activator is arranged with a resilient force member designed to return said activator when said medicament delivery device is removed from the dose delivery site.

15. The medicament delivery device of claim 14 , wherein the tubular element comprises a locking member arranged to interact with the at least one activator element on the activator for locking the activator when returned from moving towards a distal end of the medicament delivery device.

16. The medicament delivery device of claim 15 , wherein the locking member is a flexible tongue having a stop ledge.

17. The medicament delivery device of claim 1 , wherein the at least one arm comprises two arms positioned opposite each other arranged generally in a circumferential direction of the central passage.

18. The medicament delivery device of claim 1 , wherein the medicament container is arranged with a medicament delivery member though which medicament may be expelled.

19. The medicament delivery device according to claim 1 , wherein said medicament delivery device is an injection device.

20. The medicament delivery device according to claim 1 , wherein a shortest cross-measure of the oval shape of the central passage is larger than a diameter of the plunger rod.

Assignees

• Shl Medical Ag

Inventors

• Maxfield Brian

Classifications

• A61M5/31576

  Constructional features or modes of drive mechanisms for piston rods · 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

• A61M5/50

  having means for preventing re-use, or for indicating if defective, used, tampered with or unsterile {(retractable needles or needle protectors with means for preventing re-use A61M5/321)} · CPC title

• A61M2005/2073

  preventing premature release, e.g. by making use of a safety lock · CPC title

• A61M2005/3247

  Means to impede repositioning of protection sleeve from needle covering to needle uncovering position · CPC title