Injector device

Patent metadata

Field	Value
Publication number	US-12076539-B2
Application number	US-201916968957-A
Country	US
Kind code	B2
Filing date	Feb 8, 2019
Priority date	Feb 12, 2018
Publication date	Sep 3, 2024
Grant date	Sep 3, 2024

Abstract

An injector device is configurable between a safe state and an operable state and comprises a housing having a distal end and a proximal end; a medicament cartridge disposed within the housing; a needle unit comprising a needle and being disposed in the distal end of the housing; a sleeve displaceable along a longitudinal axis of the device between a first position in which the sleeve conceals the needle and a second position in which the needle is exposed from an end of the sleeve; a locking mechanism configured to prevent displacement of the sleeve when the device is in the safe state; and a button disposed in the proximal end of the housing, the button being configured to switch the device between the safe state and the operable state by releasing the locking mechanism when the button is pressed from an initial position into a depressed position during use.

First claim

The invention claimed is:

1. An injector device configurable between a safe state and an operable state, the injector device comprising:
a housing having a distal end and a proximal end;
a medicament cartridge disposed within the housing;
a needle unit comprising a needle, the needle unit being disposed in the distal end of the housing;
a sleeve displaceable along a longitudinal axis of the injector device between a first position in which the sleeve conceals the needle and a second position in which the needle is exposed from an end of the sleeve;
a locking mechanism that prevents displacement of the sleeve when the injector device is in the safe state; and
a button disposed in the proximal end of the housing, the button being configured to switch the injector device between the safe state and the operable state by releasing the locking mechanism to allow displacement of the sleeve when the button is pressed from an initial position into a depressed position during use.

2. An injector device according to claim 1 , further comprising:
a plunger displaceable to drive medicament from the medicament cartridge through the needle; and
a plunger mechanism triggerable to displace the plunger during operation of the injector device.

3. An injector device according to claim 2 , wherein the sleeve is configured to trigger the plunger mechanism when the sleeve is moved from the first position to the second position during use.

4. An injector device according to claim 3 , wherein the plunger mechanism comprises:
a coil spring that provides a force to displace the plunger when the plunger mechanism is triggered; and
a spring retaining mechanism that prevents premature displacement of the plunger prior to the plunger mechanism being triggered.

5. An injector device according to claim 4 , wherein the spring retaining mechanism comprises a coupling and a retaining pin, the coupling being arranged to couple the spring to the retaining pin prior to the plunger mechanism being triggered.

6. An injector device according to claim 5 , wherein the coupling comprises a slot that cooperates with the retaining pin.

7. An injector device according to claim 6 , wherein the retaining pin is held in cooperation with the slot by the sleeve, and wherein axial movement of the sleeve between the first position and the second position aligns the retaining pin with an opening in the sleeve such that the retaining pin is displaceable out of the slot.

8. An injector device according to claim 7 , wherein the retaining pin extends from a cantilever spring arm.

9. An injector device according to claim 8 , wherein the cantilever spring arm is configured to bias the retaining pin out of the slot.

10. An injector device according to claim 7 , wherein contacting surfaces of the slot and the retaining pin are arranged such that the retaining pin is displaceable out of the slot by axial movement of the coupling.

11. An injector device according to claim 1 , wherein in the safe state, the medicament cartridge is spaced from the needle unit.

12. An injector device according to claim 11 , wherein the button is configured to move the medicament cartridge onto the needle unit to fluidly connect the needle with the medicament cartridge when the button is pressed from the initial position to the depressed position during use.

13. An injector device according to claim 1 , wherein the locking mechanism comprises a hook that depends from a wall of the injector device.

14. An injector device according to claim 13 , wherein the hook abuts the sleeve to prevent the sleeve from moving relative to the housing when the button is in the initial position.

15. An injector device according to claim 14 , wherein the button is configured to act on the hook when the button is moved from the initial position to the depressed position to displace the hook out of abutting relation with the sleeve.

16. An injector device according to claim 1 , further comprising a reservoir of medicament in the medicament cartridge.

Assignees

• Sanofi Sa

Inventors

• Franke Beate
• Phillips Sean
• Liscio Edward
• Weiyan Nie
• Anderson Marc
• Glässer Tim
• Rau Matthias

Classifications

• A61M2005/208

  Release is possible only when device is pushed against the skin, e.g. using a trigger which is blocked or inactive when the device is not pushed against the skin · CPC title

• A61M5/3204

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

• A61M5/2466

  by piercing without internal pressure increase (A61M5/2429 takes precedence) · 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

• A61M2005/3267

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