Push Button Safety Injector

Patent metadata

Field	Value
Publication number	US-2016015897-A1
Application number	US-201414774064-A
Country	US
Kind code	A1
Filing date	Mar 12, 2014
Priority date	Mar 13, 2013
Publication date	Jan 21, 2016
Grant date	—

Abstract

A push button safety injector includes a housing having a proximal end, a distal end spaced from the proximal end, and a longitudinal axis. An injection ram is positioned along the longitudinal axis and configured to actuate a fluid chamber. The injection ram is biased toward the distal end in an initial position. A sliding member is configured to retain the injection ram in the initial position. A safety member confines radial movement of the sliding member in the initial position and allows radial movement of the sliding member in an armed position. A button is moveable between an initial extended position and a depressed position. The button is engagable with the sliding member and configured to move the sliding member radially in the armed position. The sliding member releases the injection ram when the button is in the depressed position.

First claim

I/we claim:

1 . A push button safety injector comprising:
a housing having a proximal end, a distal end spaced from the proximal end, and a longitudinal axis; an injection ram positioned along the longitudinal axis and configured to actuate a fluid chamber, the injection ram being biased toward the distal end in an initial position; a sliding member retaining the injection ram in the initial position; a safety member confining radial movement of the sliding member in the initial position and allowing radial movement of the sliding member in an armed position; and a button moveable between an initial extended position and a depressed position, the button being engagable with the sliding member and configured to move the sliding member radially in the armed position, wherein the sliding member releases the injection ram when the button is in the depressed position.

2 . The push button safety injector of claim 1 further comprising:
the fluid chamber, the fluid chamber configured for storing and dispensing a liquid medicament through an injection outlet.

3 . The push button safety injector of claim 2 , wherein the fluid chamber includes a piston slidably and sealingly received there within and configured to be longitudinally movable in the fluid chamber.

4 . The push button safety injector of claim 2 , wherein the fluid chamber includes an injection outlet.

5 . The push button safety injector of claim 4 further comprising:
a retractable needle guard configured to be moveable longitudinally relative to the fluid chamber between an extended position, in which it extends along at least a length of the injection outlet, and a retracted position, in which the retractable needle guard exposes at least a portion of the length of the injection outlet.

6 . The push button safety injector of claim 5 further comprising:
a sleeve member interposed between the fluid chamber and the retractable needle guard.

7 . The push button safety injector of claim 5 , wherein the retractable needle guard is biased toward the distal end of the housing in the extended position.

8 . The push button safety injector of claim 4 , wherein the injection outlet comprises a hollow injection needle configured for piercing through a user's skin and for delivering a needle-assisted jet of a medicament contained in the fluid chamber.

9 . The push button safety injector of claim 2 , wherein the fluid chamber includes a prefilled syringe or carpule configured to fit within the housing.

10 . The push button safety injector of claim 2 further comprising:
a sleeve member configured to hold and position the fluid chamber and/or to minimize movement of the fluid chamber due to injection force of the injection ram.

11 . The push button safety injector of claim 10 , wherein the sleeve member is contained within and mounted to the housing and configured to act as a support for a biasing member interposed between the sleeve member and the needle guard.

12 . The push button safety injector of claim 10 further comprising:
an elastomeric member interposed between the fluid chamber and the sleeve member.

13 . The push button safety injector of claim 1 , wherein the sliding member includes an aperture extending longitudinally there through.

14 . The push button safety injector of claim 13 , wherein the aperture includes a slot and a hole, wherein the slot is in communication with the hole.

15 . The push button safety injector of claim 14 , wherein the slot has a width and the hole has a diameter, wherein the width of the slot is less than the diameter of the hole.

16 . The push button safety injector of claim 14 , wherein the injection ram near the proximal end includes an engagement recess configured to engage the slot of the sliding member when the injection ram is in the initial position and to be slidably disengagable from the slot when the safety member is in the armed position.

17 . The push button safety injector of claim 1 further comprising:
a safety cap removably coupled to the distal end of the housing, wherein a user must first remove the safety cap from the housing before the user can place the safety member in the armed position.

18 . The push button safety injector of claim 17 , wherein the safety cap removably is configured to receive proximal end of the retractable needle guard there within.

19 . The push button safety injector of claim 5 further comprising:
a lock-out mechanism having at least one flexible arm formed in the supporting member and at least one slot formed in the retractable needle guard, the flexible arm being configured to be moveable between an initial unlocked position, which allows longitudinal movement of the needle guard relative to the supporting member, and a lock-out position, in which the at least one flexible arm is in a locking engagement with the at least one slot of the retractable needle guard, wherein the retractable needle guard is locked in the extended position following injection.

20 . The push button safety injector of claim 1 , wherein the safety member is moved relative to the sliding member between the initial position and the armed position.

Assignees

• Antares Pharma Inc

Inventors

• Swanson Kevin David
• Sund Julius
• Hoeft Peter A
• Madsen Patrick E

Classifications

• A61M2005/3267

  Biased sleeves where the needle is uncovered by insertion of the needle into a patient's body · CPC title

• 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

• A61M5/3202

  Devices for protection of the needle before use, e.g. caps (A61M5/50 takes precedence; for infusion spikes A61M5/1626; protectors for sharps A61B50/3001) · 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

• A61M2005/206

  With automatic needle insertion · CPC title