Syringes, syringe interfaces and syringe plungers for use with medical injectors

• US 20050113754A1
• Filed: 11/25/2003
• Published: 05/26/2005
• Est. Priority Date: 11/25/2003
• Status: Active Grant

• Current Assignee: Bayer Healthcare LLC (Bayer AG)
• Original Assignee: Medrad Incorporated (Bayer AG)
• Inventors: Cowan, Kevin P.
• Granted Patent: US 7,666,169 B2
• Time in Patent Office: Days
• US Class Current: 604/131
• CPC Class Codes: A61M 2005/14553 comprising a pressure jacket
• CPC Class Codes: A61M 2205/502 User interfaces, e.g. screens or keyboards
• CPC Class Codes: A61M 2205/505 Touch-screens; Virtual keyboard or keypads; Virtual buttons; Soft keys; Mouse touches
• CPC Class Codes: A61M 5/007 for contrast media
• CPC Class Codes: A61M 5/14546 Front-loading type injectors
• CPC Class Codes: A61M 5/1456 with a replaceable reservoir comprising a piston rod to be moved into the reservoir, e.g. the piston rod is part of the removable reservoir
• CPC Class Codes: A61M 5/14566 with a replaceable reservoir for receiving a piston rod of the pump
• CPC Class Codes: A61M 5/1458 Means for capture of the plunger flange
• CPC Class Codes: A61M 5/19 having more than one chamber , e.g. including a manifold coupling two parallelly aligned syringes through separate channels to a common discharge assembly surgical glue applicators A61B17/00491
• CPC Class Codes: A61M 5/31511 Piston or piston-rod constructions, e.g. connection of piston with piston-rod A61M5/5066 takes precedence
• CPC Class Codes: A61M 5/31513 Piston constructions to improve sealing or sliding
• CPC Class Codes: A61M 5/31515 Connection of piston with piston rod

Abstract

A syringe includes a body and a plunger movably disposed within the body. The plunger includes a wall having an inner surface and one or more inwardly projecting flanges disposed on the inner surface of the wall. Preferably, the inner surface of the wall defines a retaining shoulder formed along an axial plane thereof and the inwardly projecting flanges are radially spaced along the interior surface of the wall and extend in a longitudinal direction proximal to the retaining shoulder. The syringe may be used with an injector including a drive member. The drive member preferably includes at least one retaining member adapted to engage the retaining shoulder of the syringe plunger to allow the drive member to retract the plunger with the body of the syringe. Further, the drive member preferably includes one or more outwardly extending flange members adapted to be engaged by the inwardly projecting flanges of the syringe plungers. The outwardly extending flange members are operably linked to the at least one retaining member such that, when the syringe body is rotated and the inwardly projecting flanges on the plunger engage and move the outwardly extending flange members on the drive member, the at least one retaining member on the drive member is retracted and disengaged from the retaining shoulder of the syringe plunger.

Claims

1. A syringe comprising:

a body; and

a plunger movably disposed within the body, the plunger comprising a wall having an inner surface and an outer surface and one or more inwardly projecting flanges disposed on the inner surface of the wall.

2. The syringe of claim 1 wherein the one or more inwardly projecting flanges comprises a plurality of flanges.

3. The syringe of claim 2 wherein the plurality of flanges are spaced along a portion of the interior surface of the wall.

4. The syringe of claim 3 wherein the plurality of flanges are evenly spaced along the interior surface of the wall.

5. The syringe of claim 1 wherein the interior surface of the wall defines a retaining shoulder formed along a length thereof.

6. The syringe of claim 5 wherein the retaining shoulder is formed along an axial length of the wall.

7. The syringe of claim 1 wherein the body and the plunger wall are substantially cylindrical and the one or more inwardly projecting flanges comprises a plurality of flanges.

8. The syringe of claim 7 wherein the plurality of inwardly projecting flanges extend longitudinally along a portion of the interior surface of the plunger wall.

9. The syringe of claim 7 wherein the plurality of inwardly projecting flanges are radially spaced along a portion of the interior surface of the wall.

10. The syringe of claim 7 wherein the interior surface of the wall defines a retaining shoulder formed along a circumference thereof.

11. The syringe of claim 7 wherein the interior surface of the wall defines a retaining shoulder formed along an axial plane thereof, and the plurality of inwardly projecting flanges are radially spaced along the interior surface of the wall and extend in a longitudinal direction proximal to the retaining shoulder.

12. The syringe of claim 11 wherein the plurality of flanges are evenly spaced along the wall.

13. A fluid injection system comprising:

an injector comprising;

a housing; and

a drive member at least partially disposed within the housing, the drive member comprising at least one retaining member and one or more outwardly extending flange members; and

a syringe comprising;

a body; and

a plunger movably disposed within the body, the plunger comprising a wall having an inner surface defining a retaining shoulder and one or more inwardly projecting flanges disposed on the inner surface of the wall;

wherein the at least one retaining member on the drive member of the injector is adapted to engage the retaining shoulder on the plunger wall to enable the drive member to retract the plunger with the body of the syringe;

wherein the one or more inwardly projecting flanges on the plunger wall are adapted to engage the one or more outwardly extending flange members on the drive member when the syringe body is rotated about its longitudinal axis, the one or more outwardly extending flange members operable to cause the at least one retaining member on the drive member to disengage the retaining shoulder on the plunger wall upon rotation of the syringe body.

14. The fluid injection system of claim 13 wherein the one or more inwardly projecting flanges comprises a plurality of flanges.

15. The fluid injection system of claim 14 wherein the plurality of flanges are spaced along a portion of the interior surface of the wall.

16. The fluid injection system of claim 15 wherein the plurality of flanges are evenly spaced along the interior surface of the wall.

17. The fluid injection system of claim 13 wherein the retaining shoulder is formed along an axial length of the wall.

18. The fluid injection system of claim 13 wherein the body and the plunger wall are substantially cylindrical and the one or more inwardly projecting flanges comprises a plurality of flanges.