Injector lockout prevention device

Patent metadata

Field	Value
Publication number	US-11116911-B2
Application number	US-201715484642-A
Country	US
Kind code	B2
Filing date	Apr 11, 2017
Priority date	Apr 11, 2016
Publication date	Sep 14, 2021
Grant date	Sep 14, 2021

Abstract

A device that prevents the accidental activation and lockout of an autoinjector. In illustrative embodiments, a resistance unit is configured to resist deployment of the needle until a critical force is applied by the user to the autoinjector, at which point, the resistance of the resistance unit is overcome. Continuous application of force by the user after the resistance is overcome drives the delivery device to the injection site where the medication is administered.

First claim

What is claimed is:

1. An autoinjector, comprising:
a housing having a proximal end and a distal end;
a delivery device disposed within, and moveable relative to, the housing, wherein the delivery device comprises a syringe;
a needle guard at the distal end of the housing, the needle guard being coupled to the syringe and configured to move the syringe through the housing to an injection site; and
a resistance unit having a proximal end and a distal end, the entire proximal end of the resistance unit being disposed within the needle guard,
the resistance unit comprising a ring and a base;
the ring comprising at least one protrusion; and
the base comprising an annular end wall, a skirt extending from the annular end wall, and cantilever arms extending from the skirt, the cantilever arms comprising at least one recess configured to receive the at least one protrusion; and

the resistance unit being configured to have a first position, wherein the cantilevered arms receive the at least one protrusion such that the resistance unit prevents the needle guard from exposing the syringe to the injection site, and a second position, wherein the resistance unit does not prevent the needle guard from exposing the syringe to the injection site;
wherein an injection force, required to expose the syringe to the injection site, is transmitted by application of a critical force to the autoinjector, which is required to move the resistance unit from the first position to the second position.

2. The autoinjector of claim 1 , wherein movement of the resistance unit from the first position into the second position, by applying a critical force to the autoinjector, is configured to release the at least one protrusion from the cantilevered arms.

3. The autoinjector of claim 1 , wherein, in the second position, application of the injection force to the autoinjector is configured to cause the needle guard to expose the syringe to the injection site; and wherein the injection force is less than the critical force.

4. The autoinjector of claim 1 , wherein the autoinjector further comprises an end cap for selectively covering the distal end of the housing and the needle guard.

Assignees

• Biogen Ma Inc

Inventors

• Wu Haiming

Classifications

• A61M5/2033 Primary

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

• A61M2005/2073

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

• A61M5/326

  Fully automatic sleeve extension, i.e. in which triggering of the sleeve does not require a deliberate action by the user · CPC title

• A61M5/3204 Primary

  Needle cap remover, i.e. devices to dislodge protection cover from needle or needle hub, e.g. deshielding devices · CPC title

• A61M5/31578

  based on axial translation, i.e. components directly operatively associated and axially moved with plunger rod · CPC title