INJECTION DEVICE

• US 20110092916A1
• Filed: 10/25/2010
• Published: 04/21/2011
• Est. Priority Date: 12/02/2008
• Status: Abandoned Application

• Current Assignee: Allergan, Inc. (Canada) (Abbvie Incorporated)
• Original Assignee: Allergan, Inc. (Canada) (Abbvie Incorporated)
• Inventors: Mandaroux, Bastien, Storie, Blake R., McNerney, Kevin, Tezel, Ahmet, Mudd, Christopher S.
• Application Number:
  US12/911,555
• Publication Number:
  US 20110092916A1
• Time in Patent Office: Days
• US Class Current: 604/241
• CPC Class Codes: A61M 2210/04 Skin
• CPC Class Codes: A61M 5/3293 characterised by features of the needle hub
• CPC Class Codes: A61M 5/347 rotatable, e.g. bayonet or screw A61M5/344 takes precedence

Abstract

An injection device includes a syringe having a body with a piston disposed therein with an open end along with a viscous fluid disposed in the body for injection by the piston. A needle assembly is provided which includes a cannula, for example a blunt tipped cannula, having a luer connection engageable with the syringe distal end with the luer connector including a hub. Mating engagement is provided by way of internal threads at the syringe distal end and external treads of a hub with a pitch sufficient to prevent detachment of the hub from the syringe distal end during ejection of the viscous fluid. In addition, a stepped cavity, disposed in the hub, further prevents detachment of the hub from the syringe distal end during ejection of the viscous fluid.

Claims

1. A injection device comprising:

a needle assembly comprising a cannula and a luer connector engageable with a distal end of a syringe, said cannula having a rounded distal tip and an outlet spaced apart from said tip, and said luer connector comprising a hub with a distal end supporting said cannula and a proximal end mateable with the syringe distal end;

a cavity, defined by a stepped interior surface of the hub, effective to prevent detachment of said hub from the syringe distal end during ejection of a viscous fluid from the cannula outlet when the hub is engaged to the syringe distal end; and

external threads disposed on an exterior surface of said hub enabling mating engagement between the hub and the syringe distal end.

2. The device of claim 1 wherein the stepped cavity provides a reduced dead space relative to an otherwise identical needle assembly without the stepped interior surface.

3. The device according to claim 1 wherein the external threads has a pitch of about 3 mM.

4. The device according to claim 3 wherein the external threads comprise double lead screw threads.

5. The device according to claim 4 wherein the external threads comprise single circumference double lead screw threads.

6. The injection device of claim 7 wherein the cannula has a gauge greater than 21.

7. The injection device of claim 1 wherein the cannula has a gauge greater than 25.

8. The injection device of claim 1 wherein the cannula has a gauge greater than 30.

9. The injection device of claim 1 wherein the cannula has a gauge of up to about 32.

10. An injection device comprising:

a syringe having a body with a piston disposed therein and a distal end;

a needle assembly comprising a cannula and a luer connector engageable with the syringe distal end, said cannula having a rounded distal tip and an outlet spaced apart from said tip, and said luer connector comprising a hub with a distal end supporting said cannula and a proximal end mateable with the syringe distal end;

a cavity, defined by a stepped interior surface of the hub, effective to prevent detachment of said hub from the syringe distal end during ejection of a viscous fluid from the cannula outlet when the hub is engaged to the syringe distal end; and

external threads disposed on an exterior surface of said hub enabling mating engagement between the hub and the syringe distal end.

11. The injection device of claim 10 wherein the cannula has a gauge greater than 21.

12. The injection device of claim 10 wherein the cannula has a gauge greater than 25.

13. The injection device of claim 10 wherein the cannula has a gauge greater than 30.

14. The injection device of claim 10 wherein the cannula has a gauge of up to about 32.

15. The injection device of claim 10 further comprising viscous fluid disposed in said body and injectable by said piston through said cannula.

16. The injection device of claim 15 wherein the fluid is a dermal filler.

17. The injection device of claim 10 further comprising internal threads disposed in the syringe distal end enabling mating engagement of the hub external threads and the syringe distal end.

18. The injection device of claim 10 wherein the external threads have a pitch of about 3 mM.

19. The device according to claim 10 wherein the external threads comprise double lead screw threads.

20. The device according to claim 10 wherein the external threads comprise single circumference double lead screw threads.