Syringe With Plunger Rod Having a Flexible Portion

• US 20160158452A1
• Filed: 02/10/2016
• Published: 06/09/2016
• Est. Priority Date: 09/30/2011
• Status: Active Grant

• Current Assignee: Becton Dickinson France (Becton, Dickinson & Co)
• Original Assignee: Becton Dickinson France (Becton, Dickinson & Co)
• Inventors: Manke, Darrin Scott, Labak, Christopher, St. Cyr, Joseph Omer, Schiff, David Robert, Turpault, Mathieu Dominic, Gatta, Antonio, Coleman, John Depler
• Granted Patent: US 9,833,575 B2
• Time in Patent Office: Days
• CPC Class Codes: A61M 2005/3104 Caps for syringes without needle
• CPC Class Codes: A61M 2005/3106 Plugs for syringes without needle
• CPC Class Codes: A61M 2005/31518 designed to reduce the overall size of an injection device, e.g. using flexible or pivotally connected chain-like rod members
• CPC Class Codes: A61M 5/002 Packages specially adapted therefor, e.g. for syringes or needles, kits for diabetics needle protection, e.g. caps, A61M5/3202; for sharps A61B50/3001
• 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
• CPC Class Codes: A61M 5/5086 for indicating if defective, used, tampered with or unsterile

Abstract

A syringe assembly including a plunger rod having a first end, a second end, and a rod portion extending therebetween, wherein at least a portion of the rod portion is flexible is disclosed. The flexible portion of the rod portion allows a stopper to be moved between a first position and a second position within a syringe barrel while the overall length of the syringe assembly remains the same throughout the movement between the first position and the second position. In another embodiment, a syringe assembly including a restraining member adapted to communicate with the flexible portion of the rod portion such that movement of the first end of the plunger rod in a first direction actuates movement of the second end of the plunger rod in a second direction different than the first direction is disclosed.

Claims

1. A syringe assembly, comprising:

a syringe barrel having a first end, a second end, and a sidewall extending therebetween and defining a chamber having an interior;

a stopper slidably disposed within the interior of the chamber of the syringe barrel, the stopper sized relative to the interior of the chamber of the syringe barrel to provide sealing engagement with the sidewall of the syringe barrel; and

a plunger rod having a first end, a second end, and a rod portion extending therebetween, wherein at least a portion of the rod portion is flexible, wherein the second end of the plunger rod is engaged with the stopper such that movement of the first end of the plunger rod in a first direction moves the stopper in a second direction between a first position in which the stopper is located a first distance from the first end of the syringe barrel, and a second position in which the stopper is located a second distance from the first end of the syringe barrel, the second direction being different than the first direction and the second distance being different than the first distance, and wherein the overall length of the syringe assembly is the same when the stopper is in the first position and the second position.

2. The syringe assembly of claim 1, wherein the plunger rod has a first effective distance in the first position relative to the syringe assembly, and a second effective distance in the second position relative to the syringe assembly, the first effective distance and the second effective distance being equal.

3. The syringe assembly of claim 1, further comprising a fluid contained in the chamber.

4. The syringe assembly of claim 1, wherein the stopper comprises a first engagement portion and the second end of the plunger rod comprises a second engagement portion for securely engaging the first engagement portion.

5. The syringe assembly of claim 1, wherein the stopper comprises a first threaded portion, and the plunger rod comprises a second threaded portion adjacent the second end of the plunger rod, the second threaded portion of the plunger rod threadingly engageable with the first threaded portion of the stopper to secure the plunger rod to the stopper.

6. The syringe assembly of claim 1, wherein the syringe assembly is fully encapsulated by a packaging element.

7. The syringe assembly of claim 1, wherein at least a portion of the syringe assembly is encapsulated by a packaging element.

8. The syringe assembly of claim 7, wherein the packaging element comprises a tear strip.

9. The syringe assembly of claim 1, further comprising an actuator flange disposed at least partially about the syringe barrel and connected to the first end of the plunger rod such that movement of the actuator flange in the first direction advances the first end of the plunger rod in the first direction and the second end of the plunger rod in the second direction.

10. The syringe assembly of claim 9, wherein the actuator flange comprises a projection, and the plunger rod comprises a slot defined therein adjacent the first end of the plunger rod, the slot sized to accept the projection of the actuator flange therein.

11. The syringe assembly of claim 9, wherein the sidewall of the syringe barrel comprises an outer surface, and the actuator flange comprises an inner surface, the actuator flange connected to the plunger rod such that a portion of the plunger rod is slidably restrained between the inner surface of the actuator flange and the outer surface of the syringe barrel.

12. The syringe assembly of claim 1, wherein the rod portion of the plunger rod is formed of an elastomer.

13. The syringe assembly of claim 1, wherein the rod portion of the plunger rod is formed of a flexible metal.

14. The syringe assembly of claim 1, wherein the rod portion of the plunger rod is formed of two or more separate materials.

15. The syringe assembly of claim 14, wherein the separate materials may be one of mechanically attached together, adhesively fixed together, or molded integrally together.

16. A syringe assembly, comprising:

a syringe barrel having a first end, a second end, and a sidewall extending therebetween and defining a chamber having an interior;

a stopper slidably disposed within the interior of the chamber of the syringe barrel, the stopper sized relative to the interior of the chamber of the syringe barrel to provide sealing engagement with the sidewall of the syringe barrel;

a plunger rod having a first end, a second end, and a rod portion extending therebetween, wherein at least a portion of the rod portion is flexible, wherein the second end of the plunger rod is engaged with the stopper such that the stopper is movable between a first position in which the stopper is located a first distance from the first end of the syringe barrel, and a second position in which the stopper is located a second distance from the first end of the syringe barrel, the second direction being different than the first direction and the second distance being different than the first distance, and wherein the overall length of the syringe assembly is the same when the stopper is in the first position and the second position; and

wherein at least a portion of the syringe assembly is encapsulated by a packaging element.

17. The syringe assembly of claim 16, wherein the syringe assembly is fully encapsulated by the packaging element.

18. The syringe assembly of claim 16, wherein the packaging element comprises a tear strip.

19. The syringe assembly of claim 18, wherein the tear strip extends longitudinally along the syringe assembly.

20. The syringe assembly of claim 16, further comprising a fluid contained in the chamber.