Medicament delivery device

Patent metadata

Field	Value
Publication number	US-9662452-B2
Application number	US-201213650708-A
Country	US
Kind code	B2
Filing date	Oct 12, 2012
Priority date	Mar 31, 2010
Publication date	May 30, 2017
Grant date	May 30, 2017

Abstract

The present invention relates to a medicament delivery device comprising a drive means configured to act on a medicament container for expelling a medicament; a holding means configured to hold said drive means in a pre-tensioned state; an activation means configured to interact with said holding means for releasing said drive means from the pre-tensioned state; wherein the device further comprises feedback means configured to interact both with said holding means and with said drive means for generating an audible and/or tactile and/or visual signal indicating that the medicament has been completely expelled.

First claim

The invention claimed is:

1. An automatic feedback mechanism for a medicament delivery device that notifies a user of complete expulsion of medicament from a medicament container comprising:
a) a tubular extension member having a resilient tongue releasably and directly engaged with a plunger rod and having a radial space defined by an inner diameter and an inner distal surface;
b) a tubular operation member rotatably and coaxially engaged with the tubular extension such that the tubular operation member directly engages the resilient tongue; and
c) a signal generating member having two longitudinally extending flexible arms that are positioned parallel to each other and are joined together at a distal end to define a transversal wall, where the transversal wall abuts a resilient member and is positioned in a first position and a second position, where in the first position the transversal wall is a distance D from the inner distal surface, wherein the signal generating member generates an audible signal when the transversal wall travels distally the distance D to the second position and hits the inner distal surface when the medicament has been completely expelled.

2. The feedback mechanism of claim 1 where the flexible arms are provided with angled support members extending radially outward.

3. The feedback mechanism of claim 2 where the signal generating member comprises an elongated U-shaped bracket.

4. The feedback mechanism of claim 2 where the flexible arms in the first position have a radial extension that exceeds the radial space of the tubular extension member.

5. The feedback mechanism of claim 2 where the flexible arms in the second position have a radial extension that is less than the radial space of the tubular extension member.

6. The feedback mechanism of claim 2 where the flexible arms in the first position has a radial extension that exceeds the radial extension of the flexible arms when in the second position.

7. The feedback mechanism of claim 1 where the flexible arms are extended in a radially outward direction to secure the signal generating member in the first position.

8. The feedback mechanism of claim 1 where the resilient tongue is configured to maintain the signal generating member in the first position.

9. The feedback mechanism of claim 1 where the resilient tongue is configured to extend radially outward when the tubular operation member moves relative to the tubular extension member.

10. An automatic feedback mechanism for a medicament delivery device that notifies a user of complete expulsion of medicament from a medicament container comprising:
a) a tubular extension member having an inner distal surface and flexible tongues configured to releasably lock a plunger rod in a pre-tensioned state;
b) a tubular operation member rotatably and coaxially engaged with the tubular extension member and biasing the flexible tongues radially inwards to lock the plunger rod in the pre-tensioned state, wherein a resilient member is positioned inside the plunger rod exerting a force in the proximal direction;
c) a signal generating member partially surrounding the plunger rod and having a transversal wall and two longitudinally extending flexible arms that are positioned parallel to each other and are joined together at distal end to define the transversal wall where the transversal wall abuts the resilient member and is positioned in a first position and a second position, where in the first position the transversal wall is a distance D from the inner distal surface of the tubular extension member when the plunger rod is in the pre-tensioned state,
wherein movement of the tubular operation member causes the flexible tongues to expand radially unlocking the plunger rod to travel proximally and allowing the resilient member to move the signal generating member distally the distance D to the second position where the transversal wall hits the inner distal surface generating an audible signal signifying complete expulsion of medicament from a medicament container.

Assignees

• Shl Group Ab

Inventors

• Daniel Mattias

Classifications

• A61M2205/582

  by tactile feedback · CPC title

• A61M5/31501

  Means for blocking or restricting the movement of the rod or piston (A61M5/5013 takes precedence) · CPC title

• A61M5/2033

  Spring-loaded one-shot injectors with or without automatic needle insertion (multishot dosing syringes A61M5/31525, needle insertion only A61M5/3287) · CPC title

• A61M2205/583

  by visual feedback · CPC title

• A61M5/3158

  performed by axially moving actuator operated by user, e.g. an injection button · CPC title