Medication delivery pen assembly with needle locking safety shield

• US 20050038392A1
• Filed: 08/11/2003
• Published: 02/17/2005
• Est. Priority Date: 08/11/2003
• Status: Active Grant

• Current Assignee: Embecta Corporation
• Original Assignee: Becton, Dickinson & Co
• Inventors: DeSalvo, David E.
• Granted Patent: US 8,932,264 B2
• Time in Patent Office: Days
• US Class Current: 604/198
• CPC Class Codes: A61M 2005/3247 Means to impede repositioning of protection sleeve from needle covering to needle uncovering position
• CPC Class Codes: A61M 5/3243 being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel devices for protecting guide needles in combination with catheters A61M25/0612

Abstract

A medication delivery pen assembly having a pen body and a needle assembly with a hub connected to the pen body, a needle cannula extending through the hub with a distal end sharpened for insertion into a patient, and a shield having a tubular portion telescopingly disposed about at least a portion of the hub. The tubular portion includes an internal surface, at least one projection extending inwardly from the internal surface, and the hub having at least one externally extending projection. The shield is axially displaceable relatively along the hub distally from a first position, where the distal end of the needle cannula is exposed, to a second position, where the distal end of the needle cannula is enclosed by the shield. Upon the shield being displaced to the second position, the at least one projection on the hub is deflectibly urged passed the at least one projection on the tubular portion so that subsequent distal-to-proximal movement of the shield relative to the hub is hindered by interengagement of the projections. The needle cannula may be directly affixed to the pen body with the hub being formed unitarily with, rigidly affixed to, or removably affixed to the pen body.

Claims

1. A medication delivery pen assembly comprising:

a pen body; and

a needle assembly having a hub connected to said pen body, a needle cannula extending through said hub having a distal end sharpened for insertion into a patient, and a shield having a tubular portion telescopingly disposed about at least a portion of said hub, said tubular portion having an internal surface said tubular portion having a first projection extending inwardly from said internal surface, said hub having an externally extending second projection, wherein, said shield being axially displaceable relatively along said hub distally from a first position, where said distal end of said needle cannula is exposed, to a second position, where said distal end of said needle cannula is enclosed by said shield, and, wherein, upon said shield being displaced to said second position, said second projection is deflectibly urged passed said first projection so that distal-to-proximal movement of said shield relative to said hub is hindered by interengagement of said second projection and said first projection.

2. An assembly as in claim 1, wherein said first projection includes a first inclined surface that faces distally and inwardly.

3. An assembly as in claim 2, wherein said first projection includes a second inclined surface that faces proximally and outwardly.

4. An assembly as in claim 3, wherein an acute angle is subtended between said first and second inclined surfaces.

5. An assembly as in claim 1, wherein said second projection is annular.

6. An assembly as in claim 1, wherein said second projection flares outwardly at a distal end of said hub.

7. An assembly as in claim 6, wherein said second projection includes a first inclined surface that faces proximally and outwardly.

8. An assembly as in claim 7, wherein said second projection includes a second inclined surface that faces distally and inwardly.

9. An assembly as in claim 8, wherein said first and second inclined surfaces converge at said distal end of said hub.

10. An assembly as in claim 1, further comprising at least one stop member extending inwardly of said shield formed to engage said hub and limit distal movement of said shield relative to said hub.

11. An assembly as in claim 10, wherein said at least one stop member is proximally spaced from said first projection.

12. An assembly as in claim 1, wherein said hub of said needle assembly is removably mounted to said pen body.

13. An assembly as in claim 12, wherein said needle assembly and said pen body are formed with cooperating thread members to allow for threaded mounting of said hub on said pen body.

14. An assembly as in claim 1, wherein said cannula includes a proximal end sharpened for insertion into a septum of a medicinal container disposed in said pen body.

15. An assembly as in claim 1, wherein a plurality of said first projections are provided circumferentially spaced-apart on said internal surface of said shield.

16. An assembly as in claim 1, wherein said shield includes a cover located in proximity to an end of said tubular portion, said cover having an aperture formed therein which allows for the passage therethrough of said needle cannula.

17. A needle assembly comprising a hub, a needle cannula extending through said hub having a distal end sharpened for insertion into a patient, and a shield having a tubular portion telescopingly disposed about at least a portion of said hub, said tubular portion having an internal surface said first tubular portion having a first projection extending inwardly from said internal surface, said hub having an externally extending second projection, wherein, said shield being axially displaceable relatively along said hub distally from a first position, where said distal end of said needle cannula is exposed, to a second position, where said distal end of said needle cannula is enclosed by said shield, and, wherein, upon said shield being displaced to said second position, said second projection is deflectibly urged passed said first projection so that distal-to-proximal movement of said shield relative to said hub is hindered by interengagement of said second projection and said first projection.

18. An assembly as in claim 17, wherein said first projection includes a first inclined surface that faces distally and inwardly.

19. An assembly as in claim 18, wherein said first projection includes a second inclined surface that faces proximally and outwardly.

20. An assembly as in claim 19, wherein an acute angle is subtended between said first and second inclined surfaces.

21. An assembly as in claim 17, wherein said second projection is annular.

22. An assembly as in claim 17, wherein said second projection flares outwardly at a distal end of said hub.

23. An assembly as in claim 22, wherein said second projection includes a first inclined surface that faces proximally and outwardly.

24. An assembly as in claim 23, wherein said second projection includes a second inclined surface that faces distally and inwardly.

25. An assembly as in claim 24, wherein said first and second inclined surfaces converge at said distal end of said hub.

26. An assembly as in claim 17, further comprising at least one stop member extending inwardly of said shield formed to engage said hub and limit distal movement of said shield relative to said hub.

27. An assembly as in claim 26, wherein said at least one stop member is proximally spaced from said first projection.

28. An assembly as in claim 17, wherein said cannula includes a proximal end sharpened for insertion into a septum of a medicinal container.

29. An assembly as in claim 17, wherein a plurality of said first projections are provided circumferentially spaced-apart on said internal surface of said shield.

30. An assembly as in claim 17, wherein said shield includes a cover located in proximity to an end of said tubular portion, said cover having an aperture formed therein which allows for the passage therethrough of said needle cannula.

31. An assembly as in claim 17, wherein said hub is mountable to a medication delivery pen.

32. A medication delivery pen assembly comprising:

a pen body having a hub having a needle cannula affixed thereto, said needle cannula having a distal end sharpened for insertion into a patient; and

a shield having a tubular portion telescopingly disposed about at least a portion of said hub, said tubular portion having an internal surface said tubular portion having a first projection extending inwardly from said internal surface, said hub having an externally extending second projection, wherein, said shield being axially displaceable relatively along said hub distally from a first position, where said distal end of said needle cannula is exposed, to a second position, where said distal end of said needle cannula is enclosed by said shield, and, wherein, upon said shield being displaced to said second position, said second projection is urged passed said first projection so that distal-to-proximal movement of said shield relative to said hub is hindered by interengagement of said second projection and said first projection.

33. An assembly as in claim 32, wherein said hub is formed unitarily with said pen body.

34. An assembly as in claim 32, wherein said hub is non-removably affixed to said pen body.

35. An assembly as in claim 32, wherein said hub is removably affixed to said pen body.

36. An assembly as in claim 32, wherein said first projection includes a first inclined surface that faces distally and inwardly.

37. An assembly as in claim 36, wherein said first projection includes a second inclined surface that faces proximally and outwardly.

38. An assembly as in claim 37, wherein an acute angle is subtended between said first and second inclined surfaces.

39. An assembly as in claim 32, wherein said second projection is annular.

40. An assembly as in claim 32, wherein said second projection flares outwardly at a distal end of said hub.

41. An assembly as in claim 40, wherein said second projection includes a first inclined surface that faces proximally and outwardly.

42. An assembly as in claim 41, wherein said second projection includes a second inclined surface that faces distally and inwardly.

43. An assembly as in claim 42, wherein said first and second inclined surfaces converge at said distal end of said hub.

44. An assembly as in claim 32, further comprising at least one stop member extending inwardly of said shield formed to engage said hub and limit distal movement of said shield relative to said hub.

45. An assembly as in claim 44, wherein said at least one stop member is proximally spaced from said first projection.

46. An assembly as in claim 32, wherein said cannula includes a proximal end sharpened for insertion into a septum of a medicinal container disposed in said pen body.

47. An assembly as in claim 32, wherein a plurality of said first projections are provided circumferentially spaced-apart on said internal surface of said shield.

48. An assembly as in claim 32, wherein said shield includes a cover located in proximity to an end of said tubular portion, said cover having an aperture formed therein which allows for the passage therethrough of said needle cannula.