Syringe, syringe plunger and attachment mechanism for front loading medical injector

• US 6,585,700 B1
• Filed: 10/05/2000
• Issued: 07/01/2003
• Est. Priority Date: 10/05/2000
• Status: Expired due to Fees

• Current Assignee: Medrad Incorporated (Bayer AG)
• Original Assignee: Medrad Incorporated (Bayer AG)
• Inventors: Masters, Michael J., Trocki, Mark
• Primary Examiner(s): Huson, Gregory
• Assistant Examiner(s): Huynh, Khoa D.
• Application Number:
  US09/679,850
• Time in Patent Office: 999 Days
• Field of Search: 604/218, 604/222, 604/219, 604/220, 604/221, 604/287, 604/187, 604/230, 604/228, 604/229
• US Class Current: 604/218
• CPC Class Codes: A61M 5/14546 Front-loading type injectors
• CPC Class Codes: A61M 5/14566 with a replaceable reservoir for receiving a piston rod of the pump
• CPC Class Codes: A61M 5/31513 Piston constructions to improve sealing or sliding
• CPC Class Codes: A61M 5/44 having means for cooling or heating the devices or media

Abstract

A mounting member for attaching a front-loading syringe to a powered injector is disclosed. The present invention may also include a plunger that has a two-piece molded core portion that is readily attachable to a plunger drive member of a powered injector. The plunger core may also be equipped with an anti-cocking flange to prevent the plunger from being axially misaligned within the syringe body which could result in fluid leakage between the plunger and the syringe body. An alignment flange may also be provided on the plunger to assist with the proper insertion of the plunger into the syringe during the assembly process. A method of manufacturing a syringe plunger is also disclosed. The present invention further includes a sleeve for clampingly engaging a heating blanket to the outer surface of a syringe.

Claims

1. A syringe, comprising:

a syringe body defining a syringe axis and having an open rear end, an interior surface and a discharge end; and

a plunger slidably received in said syringe body and selectively axially movable therein, said plunger having a seal comprising at least one sealing rib on an outer circumference thereof for establishing a substantially fluid-tight seal with the interior surface of said syringe body, said plunger further having an anti-cocking member formed thereon for maintaining said plunger in substantial axial alignment with the syringe axis and the at least one sealing rib in sealing contact with the interior surface of said syringe body, the anti-cocking member being dimensioned such that the anti-cocking member does not contact the interior surface of said syringe body when said plunger is in substantial axial alignment with the syringe axis, said plunger further having a drive engagement member formed thereon for connecting the plunger to a drive mechanism.

2. The syringe of claim 1 wherein said plunger further has an alignment flange formed thereon.

3. The syringe of claim 1 wherein the syringe body comprises at least one attachment flange.

4. The syringe of claim 1 wherein the syringe body comprises at least a first pair of attachment flanges.

5. The syringe of claim 4 wherein the syringe body further comprises at least a second pair of attachment flanges.

6. The syringe of claim 5 wherein the second pair of attachment flanges is arranged at 90°

with respect to the first pair of attachment flanges.

7. The syringe of claim 1 wherein the syringe body comprises an annular drip flange formed around an outer perimeter thereof.

8. The syringe of claim 3 wherein the syringe body further comprises an annular drip flange positioned forward of the at least one attachment flange.

9. The syringe of claim 3 wherein the at least one attachment flange comprises two attachment flanges.

10. The syringe of claim 1 wherein the syringe body is formed of polypropylene.

11. The syringe of claim 1 wherein the syringe body is prefilled with a fluid medium.

12. The syringe of claim 1 wherein the discharge end defines a screw-threaded connection portion to facilitate attachment of a connector tubing to the discharge end.

13. The syringe of claim 1 wherein the anti-cocking member is disposed rearward of the at least one sealing rib.

14. The syringe of claim 1 wherein the anti-cocking member comprises a ring extending around the perimeter of said plunger.

15. The syringe of claim 1 wherein an outer perimeter of the anti-cocking member is rounded.

16. A syringe comprising a plunger defining a central axis and comprising an attachment portion connecting the plunger to a drive mechanism, the attachment portion comprising a blade portion having a height and an attachment button having a diameter, said attachment button attached to said blade portion and being substantially perpendicular to the central axis, the height of said blade portion being substantially equal to the diameter of said attachment button.

17. The syringe of claim 16 wherein the plunger attachment portion allows the plunger to be connected to or disconnected from a drive member of an injector at any location of the plunger within the syringe.

18. The syringe of claim 16, further comprising a syringe body in which the plunger is movably disposed.

19. The syringe of claim 18 wherein the syringe body comprises at least one attachment flange.

20. The syringe of claim 18 wherein the syringe body comprises at least a first pair of attachment flanges.

21. The syringe of claim 20 wherein the syringe body further comprises at least a second pair of attachment flanges.

22. The syringe of claim 21 wherein the second pair of attachment flanges is arranged at 90°

with respect to the first pair of attachment flanges.

23. The syringe of claim 19 wherein the syringe body further comprises an annular drip flange positioned forward of the at least one attachment flange.

24. The syringe of claim 19 wherein the at least one attachment flange comprises two attachment flanges.

25. The syringe of claim 18 wherein the syringe body comprises an annular drip flange formed around an outer perimeter thereof.

26. The syringe of claim 18 wherein the syringe body is formed of polypropylene.

27. The syringe of claim 18 wherein the syringe body is prefilled with a fluid medium.

28. The syringe of claim 18 wherein the syringe body has a discharge end that defines a screw-threaded connection portion to facilitate attachment of a connector tubing to the discharge end.

29. The syringe of claim 16 wherein said attachment button is substantially circular.

30. The syringe of claim 16 wherein said blade portion has a width that is less than the height.

31. The syringe of claim 16 wherein said blade portion has a hexagonal cross-sectional shape.

32. A syringe comprising:

a syringe body defining a syringe axis and having an interior surface, an open rear end and a discharge end;

a plunger movably disposed within the syringe body, the plunger comprising at least one sealing rib for establishing a substantially fluid-tight seal between said plunger and the interior surface of said syringe body, an anti-cocking member formed thereon to retain said plunger in axial alignment within said syringe body, and an attachment portion for connecting the plunger to a drive mechanism comprising a blade portion having a height and an attachment button having a diameter, the attachment button being attached to the blade portion, the height of the blade portion being substantially equal to the diameter of the attachment button.

33. The syringe of claim 32 wherein the blade portion is substantially perpendicular to a central axis of the plunger.

34. The syringe of claim 32 wherein the attachment portion of the plunger is operable to connect the plunger to a drive mechanism of an injector.

35. The syringe of claim 32 wherein the syringe body comprises at least one attachment flange.

36. The syringe of claim 32 wherein the syringe body comprises at least a first pair of attachment flanges.

37. The syringe of claim 36 wherein the syringe body further comprises at least a second pair of attachment flanges.

38. The syringe of claim 37 wherein the second pair of attachment flanges is arranged at 90°

with respect to the first pair of attachment flanges.

39. The syringe of claim 32 wherein the syringe body comprises an annular drip flange formed around an outer perimeter thereof.

40. The syringe of claim 35 wherein the syringe body further comprises an annular drip flange positioned forward of the at least one attachment flange.

41. The syringe of claim 35 wherein the at least one attachment flange comprises two attachment flanges.

42. The syringe of claim 32 wherein the syringe body is formed of polypropylene.

43. The syringe of claim 32 wherein the syringe body is prefilled with a fluid medium.

44. The syringe of claim 32 wherein the discharge end defines a screw-threaded connection portion to facilitate attachment of a connector tubing to the discharge end.

45. The syringe of claim 32 wherein the anti-cocking member is disposed rearward of the at least one sealing rib.

46. The syringe of claim 32 wherein the anti-cocking member comprises a ring extending around the perimeter of the plunger.

47. The syringe of claim 32 wherein the attachment button is substantially circular.

48. The syringe of claim 32 wherein the blade portion has a width that is less than the height.

49. The syringe of claim 32 wherein the blade portion has a hexagonal cross-sectional shape.

50. The syringe of claim 32 wherein the anti-cocking member is dimensioned such that the anti-cocking member does not contact the interior surface of the syringe body when the plunger is in substantial axial alignment with the syringe axis.

51. A syringe comprising:

a syringe body defining a syringe axis and having an open rear end, an interior surface and a discharge end;

a plunger slidably received in said syringe body and selectively axially movable therein, said plunger having a seal comprising at least one sealing rib on an outer circumference thereof for establishing a substantially fluid-tight seal with the interior surface of said syringe body, said plunger further having an anti-cocking member formed thereon for maintaining said plunger in substantial axial alignment with the syringe axis and the at least one sealing rib in sealing contact with the interior surface of said syringe body, the anti-cocking member being dimensioned such that the anti-cocking member does not contact the interior surface of said syringe body when said plunger is in substantial axial alignment with the syringe axis, said plunger further having a drive engagement member formed thereon for connecting the plunger to a drive mechanism; and

at least one attachment flange disposed on said syringe body.

52. A syringe comprising:

a syringe body defining a syringe axis and having an open rear end, an interior surface and a discharge end;

a plunger slidably received in said syringe body and selectively axially movable therein, said plunger having a seal comprising at least one sealing rib on an outer circumference thereof for establishing a substantially fluid-tight seal with the interior surface of said syringe body, said plunger further having an anti-cocking member formed thereon for maintaining said plunger in substantial axial alignment with the syringe axis and the at least one sealing rib in sealing contact with the interior surface of said syringe body, the anti-cocking member being dimensioned such that the anti-cocking member does not contact the interior surface of said syringe body when said plunger is in substantial axial alignment with the syringe axis, said plunger further having a drive engagement member formed thereon for connecting the plunger to a drive mechanism;

a first pair of attachment flanges disposed on said syringe body; and

a second pair of attachment flanges disposed on said syringe body and arranged at approximately 90°

with respect to said first pair of attachment flanges.

53. A syringe comprising:

a syringe body;

a plunger movably disposed within said syringe body, said plunger defining a central axis and comprising an attachment portion connecting the plunger to a drive mechanism, the attachment portion comprising a blade portion having a height and an attachment button having a diameter, the attachment button attached to the blade portion and being substantially perpendicular to the central axis, the height of the blade portion being substantially equal to the diameter of the attachment button; and

at least one attachment flange disposed on said syringe body.

54. A syringe comprising:

a syringe body;

a plunger movably disposed within said syringe body, said plunger defining a central axis and comprising an attachment portion for connecting the plunger to a drive mechanism, the attachment portion comprising a blade portion having a height and an attachment button having a diameter, the attachment button attached to the blade portion and being substantially perpendicular to the central axis, the height of the blade portion being substantially equal to the diameter of the attachment button;

a first pair of attachment flanges disposed on said syringe body; and

a second pair of attachment flanges disposed on said syringe body and arranged at approximately 90°

with respect to said first pair of attachment flanges.

55. A syringe comprising:

a syringe body defining a syringe axis and having an interior surface, an open rear end and a discharge end;

a plunger movably disposed within said syringe body, said plunger comprising at least one sealing rib for establishing a substantially fluid-tight seal between said plunger and the interior surface of said syringe body, an anti-cocking member formed thereon to retain said plunger in axial alignment within said syringe body, and an attachment portion for connecting the plunger to a drive mechanism comprising a blade portion having a height and an attachment button having a diameter, the attachment button being attached to the blade portion, the height of the blade portion being substantially equal to the diameter of the attachment button; and

at least one attachment flange disposed on said syringe body.

56. A syringe comprising:

a syringe body defining a syringe axis and having an interior surface, an open rear end and a discharge end;

a plunger movably disposed within said syringe body, said plunger comprising at least one sealing rib for establishing a substantially fluid-tight seal between said plunger and the interior surface of said syringe body, an anti-cocking member formed thereon to retain said plunger in axial alignment within said syringe body, and an attachment portion for connecting the plunger to a drive mechanism comprising a blade portion having a height and an attachment button having a diameter, the attachment button being attached to the blade portion, the height of the blade portion being substantially equal to the diameter of the attachment button;

a first pair of attachment flanges disposed on said syringe body; and

a second pair of attachment flanges disposed on said syringe body and arranged at approximately 90°

with respect to said first pair of attachment flanges.