DISPOSABLE INJECTION DEVICE

• US 20110098641A1
• Filed: 12/29/2010
• Published: 04/28/2011
• Est. Priority Date: 01/07/2003
• Status: Active Grant

• Current Assignee: Becton, Dickinson & Co
• Original Assignee: Becton, Dickinson & Co
• Inventors: Pettis, Ronald J., Erskine, Timothy, Haider, M. Ishaq
• Granted Patent: US 8,157,768 B2
• Time in Patent Office: Days
• US Class Current: 604/110
• CPC Class Codes: A61M 2005/2013 triggering of discharging means by contact of injector with patient body
• CPC Class Codes: A61M 2005/3247 Means to impede repositioning of protection sleeve from needle covering to needle uncovering position
• CPC Class Codes: A61M 2037/0023 Drug applicators using microneedles
• CPC Class Codes: A61M 5/2033 Spring-loaded one-shot injectors with or without automatic needle insertion multishot dosing syringes A61M5/31525, needle insertion only A61M5/3287
• CPC Class Codes: A61M 5/2429 by telescoping of ampoules or carpules with the syringe body
• CPC Class Codes: A61M 5/3234 Fully automatic needle retraction, i.e. in which triggering of the needle does not require a deliberate action by the user
• CPC Class Codes: A61M 5/46 having means for controlling depth of insertion
• CPC Class Codes: A61M 5/502 for blocking the piston

Abstract

An injection device is provided. The device includes a housing having a first end defining a first opening. A plunger is received within the first opening of the housing to move between first and second positions. A cartridge is disposed in the housing and has an interior serving as a reservoir for a drug. A delivery needle is disposed within the housing and is in fluid communication with the reservoir via an interruptible fluid channel. A locking mechanism is disposed in the housing. In the first position of the plunger the delivery needle is enclosed by the plunger and in the second position of the plunger the delivery needle is placed in an injection position and the plunger activates the locking mechanism whereby when the plunger returns to the first position the locking mechanism prevents the needle from being placed in the injection position.

Claims

1. An injection device, comprising;

a housing having a first end defining a first opening;

a plunger received within the first opening of the housing to move between first and second positions;

a cartridge disposed in the housing and having an interior serving as a reservoir for a drug;

a delivery needle disposed within the housing and in fluid communication with the reservoir via an interruptible fluid channel; and

a locking mechanism disposed in the housing,

wherein in the first position of the plunger the delivery needle is enclosed by the plunger and in the second position of the plunger the delivery needle is placed in an injection position and the plunger activates the locking mechanism whereby when the plunger returns to the first position the locking mechanism prevents the needle form being placed in the injection position.

2. The device of claim 1, further comprising an interlock including a first resilient member biasing the plunger to at least partially extend out of the first opening.

3. The device of claim 2, wherein the locking mechanism comprises a second resilient member connected to the interlock, the second resilient member having a relaxed position towards a center of the first opening.

4. The device of claim 1, wherein in the injection position the delivery needle is exposed via the first opening.

5. The device of claim 3, further comprising a latch holding the second resilient member clear of the first opening to enable the delivery needle to be placed to the injection position.

6. The device of claim 3, further comprising a needle hub carrying the delivery needle and wherein in the second position of the plunger, the needle hub releases the latch and the second resilient member rests against a side of the needle hub while the delivery needle is in the injection position.

7. The device of claim 3, wherein when the plunger returns to the first position, the second resilient member moves towards the center of the first opening and prevents the delivery needle form being placed in the injection position.

8. The device of claim 1, wherein the plunger further comprises a bottom surface adapted to be brought into contact with the skin of a subject.

9. The device of claim 1, further comprising means for expelling the drug from the reservoir.

10. The device of claim 9, wherein the means for expelling comprises a spring.

11. The device of claim 1, further comprising an indicator for indicating when the injection is complete.

12. The device of claim 1, further comprising a needle carrier disposed in the housing, the delivery needle being attached to the needle carrier.

13. The device of claim 12, wherein the needle carrier is fixed in the housing.

14. The device of claim 12, wherein a portion of the interruptible fluid channel comprises a longitudinal bore through the needle carrier, the delivery needle being disposed at one end of the bore.

15. The device of claim 14, further comprising an access needle disposed at another end of the bore.

16. A medical device, comprising:

a housing having a first end defining a first opening;

a plunger received with in the first opening of the housing to move between first and second positions;

a needle for administering or withdrawing fluids; and

a locking mechanism disposed in the housing,

wherein in the first position of the plunger the needle is enclosed by the plunger and in the second position of the plunger the needle is placed in an exposed position and the plunger activates the locking mechanism whereby when the plunger returns to the first position the locking mechanism prevents the needle from being placed in the exposed position.

17. The device of claim 16, further comprising an interlock including a first resilient member biasing the plunger to at least partially extend out of the first opening.

18. The device of claim 17, wherein the locking mechanism comprises a second resilient member connected to the interlock;

the second resilient member having a relaxed position towards a center of the first opening.

19. The device of claim 16, wherein in the exposed position the needle is exposed via the first opening.

20. The device of claim 18, further comprising a latch holding the second resilient member clear of the first opening to enable the needle to be placed to the exposed position.