Syringes for medical injector systems

• US 9,844,622 B2
• Filed: 03/22/2010
• Issued: 12/19/2017
• Est. Priority Date: 07/10/2000
• Status: Active Grant

• Current Assignee: Bayer Healthcare LLC (Bayer AG)
• Original Assignee: Bayer Healthcare LLC (Bayer AG)
• Inventors: Savage, Rodney Brian
• Primary Examiner(s): Desanto, Matthew F
• Application Number:
  US12/728,869
• Publication Number:
  US 20100256486A1
• Time in Patent Office: 2,829 Days
• Field of Search: 604131-151, 604218-243
• CPC Class Codes: A61M 2005/14553 comprising a pressure jacket
• CPC Class Codes: A61M 2205/11 with means for preventing cross-contamination when used for multiple patients
• CPC Class Codes: A61M 2205/14 Detection of the presence or absence of a tube, a connector or a container in an apparatus
• CPC Class Codes: A61M 2205/215 Tilt detection, e.g. for warning or shut-off
• CPC Class Codes: A61M 2205/587 Lighting arrangements
• CPC Class Codes: A61M 2205/60 with identification means
• CPC Class Codes: A61M 5/007 for contrast media
• 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 5/1458 Means for capture of the plunger flange
• 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
• CPC Class Codes: A61M 5/347 rotatable, e.g. bayonet or screw A61M5/344 takes precedence
• CPC Class Codes: A61M 5/348 snap lock, i.e. upon axial displacement of needle assembly A61M5/344 takes precedence
• CPC Class Codes: A61M 5/36 with means for eliminating or preventing injection or infusion of air into body dialysis systems, blood oxygenators A61M1/14; haemofiltration equipment A61M1/34; automatic tube cut-off A61M39/281
• CPC Class Codes: A61M 5/5066 Means for preventing re-use by disconnection of piston and piston-rod

Abstract

A syringe for use with a medical injector system includes a barrel and a semi-rigid hub, the hub having an outer surface adapted to slidingly move within the barrel, and an inner surface having a continous circumferential wall. The hub further includes an annular engaging portion recessed within at least part of the continous circumferential wall forming a groove, at least one radially extendable and retractable retention member disposed at partially within a proximal cylindrical portion of the hub, and the elastometric seal engaged with a seal engaging portion on the hub and slidingly engaged with the barrel of the syringe. The semi-rigid hub and the elastomeric seal are reciprocally slidable within the barrel, and the at least one radially entendable and retractable retention member is configured to releasably engage the groove upon retraction of the plunger to permit the semi-rigid hub to be selectively withdrawn within the barrel.

Claims

1. A syringe for use with a medical injector system, comprising:

a barrel having a proximal end and a distal end;

a semi-rigid hub, the semi-rigid hub having;

an outer surface adapted to slidingly move within the barrel, the outer surface having a seal engaging portion;

an inner surface having a distal conical portion and a proximal cylindrical portion with a continuous circumferential wall extending continuously between a terminal portion of an open proximal end of the semi-rigid hub and the distal conical portion, the inner surface adapted to slidingly engage a plunger, wherein the entire continuous circumferential wall has a diameter equal to or larger than the distal conical portion and wherein an inner diameter of the continuous circumferential wall is substantially equal to an inner diameter of the open proximal end of the semi-rigid hub;

an annular engaging portion recessed within at least part of the continuous circumferential wall forming a groove;

at least one radially extendable and retractable retention member disposed at least partially within the proximal cylindrical portion; and

an elastomeric seal engaged with the seal engaging portion on the semi-rigid hub and slidingly engaged with the barrel of the syringe,

wherein the semi-rigid hub and the elastomeric seal are reciprocally slidable within the barrel, and

wherein the at least one radially extendable and retractable retention member is configured to releasably engage the groove upon retraction of the plunger in a direction from the distal end toward the proximal end of the barrel to permit the semi-rigid hub to be selectively withdrawn within the barrel.

2. The syringe according to claim 1, wherein the seal comprises:

an outer surface adapted to slidingly engage with the barrel of the syringe; and

an inner surface adapted to engage the semi-rigid hub.

3. The syringe according to claim 1, wherein the groove extends around an entire inner circumference of the inner surface of the semi-rigid hub.

4. The syringe according to claim 1, wherein the groove extends at least partially along a circumference of the inner surface of the semi-rigid hub.

5. The syringe according to claim 1, wherein the elastomeric seal comprises an extended leading edge to increase efficiency of the elastomeric seal under pressure.

6. A syringe for use with a medical injector system, comprising:

a barrel having a proximal end and a distal end;

a semi-rigid hub, the semi-rigid hub having;

an outer surface adapted to slidingly move within the barrel, the outer surface having a seal engaging portion;

an inner surface having a distal conical portion and a proximal cylindrical portion with a continuous circumferential wall extending continuously between a terminal portion of an open proximal end of the semi-rigid hub and the distal conical portion, the inner surface adapted to slidingly engage a plunger, wherein the entire continuous circumferential wall has a diameter equal to or larger than the distal conical portion; and

an annular engaging portion recessed within at least part of the continuous circumferential wall forming a groove;

at least one radially extendable and retractable retention member disposed at least partially within the proximal cylindrical portion; and

an elastomeric seal engaged with the seal engaging portion on the semi-rigid hub and slidingly engaged with the barrel of the syringe,

wherein an inner diameter of at least a portion of the continuous circumferential wall distal of the groove is substantially equal to an inner diameter of the open proximal end of the semi-rigid hub,

wherein the semi-rigid hub and the elastomeric seal are reciprocally slidable within the barrel, and

wherein the at least one radially extendable and retractable retention member is configured to releasably engage the groove upon retraction of the plunger in a direction from the distal end toward the proximal end of the barrel to permit the semi-rigid hub to be selectively withdrawn within the barrel.

7. The syringe according to claim 6, wherein the groove extends at least partially along a circumference of the inner surface of the semi-rigid hub.

8. The syringe according to claim 6, wherein the groove extends around an entire inner circumference of the inner surface of the semi-rigid hub.

9. The syringe according to claim 6, wherein the elastomeric seal comprises:

an outer surface adapted to slidingly engage with the barrel of the syringe; and

an inner surface adapted to engage the semi-rigid hub.