Drug delivery device for fluid restricted patients

• US 8,814,829 B2
• Filed: 08/12/2010
• Issued: 08/26/2014
• Est. Priority Date: 08/12/2010
• Status: Active Grant

• Current Assignee: Baxter Healthcare SA (Baxter International Inc.), Baxter International Inc.
• Original Assignee: Baxter International Inc.
• Inventors: Lal, Birendra K.
• Primary Examiner(s): Berdichevsky, Aarti B
• Assistant Examiner(s): OSINSKI, BRADLEY JAMES
• Application Number:
  US12/855,448
• Publication Number:
  US 20120041416A1
• Time in Patent Office: 1,475 Days
• Field of Search: 604/187, 604207-209, 604141-144, 604/131
• US Class Current: 604/141
• CPC Class Codes: A61M 39/22 Valves or arrangement of valves A61M39/02, A61M39/0247, A61M39/16 take precedence; regulating valves in infusion systems A61M5/16881; in devices worn by the patient for the reception of urine, faeces, catamenial or other discharge, or in colostomy devices A61F5/4405
• CPC Class Codes: A61M 5/14 Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor

Abstract

A syringe assembly for connecting to an intravenous (“IV”) line includes: a syringe barrel having an actuation end and a discharge end; a syringe plunger moveable within the syringe barrel, the syringe plunger including a plunger head connected to a plunger arm; a seal between the plunger arm and the syringe barrel, the seal residing on an actuation end side of the syringe plunger; and a tube in fluid communication with the syringe barrel at a location between the seal and the plunger head, the tube having a distal end configured to be connected to the IV line.

Claims

1. A syringe assembly for connecting to an intravenous (“

IV”

) line comprising;

a syringe barrel having an actuation end portion and a discharge end;

a syringe plunger moveable within the syringe barrel, the syringe plunger including a plunger head affixed to a first end of a plunger rod, the plunger head forming a sliding seal engagement with an inner wall of the syringe barrel;

a seal sealing the actuation end portion of the syringe barrel, the seal forming a sliding seal engagement with the plunger rod;

wherein the syringe barrel, the syringe rod, the plunger head, and the seal are positioned and arranged to define a substantially hollow space extending from the seal to the plunger head; and

a tube in fluid communication with the substantially hollow space at a location between the seal and the plunger head such that a fluid can flow from the tube into the substantially hollow space and contact the plunger head, the tube having a distal end that includes a medical fluid connector configured to be connected to the IV line.

2. The syringe assembly of claim 1, wherein the tube is connected to the syringe barrel near the seal.

3. The syringe assembly of claim 1, wherein the seal is fixed to the syringe barrel.

4. The syringe assembly of claim 1, wherein the discharge end of the syringe barrel is configured to attach sealingly to a connector of the IV line.

5. The syringe assembly of claim 1, wherein the medical fluid connector includes a luer connector configured to be mated to a second connector of the IV line.

6. The syringe assembly of claim 1, wherein the seal is a first seal, and wherein the plunger head includes a second seal that is moveably sealed to the syringe barrel.

7. The syringe assembly of claim 6, wherein the second seal is formed by an outer wall of the plunger head.

8. The syringe assembly of claim 6, wherein the second seal is an o-ring seal held by the plunger head.

9. The syringe assembly of claim 6, wherein the substantially hollow space forms an expandable sealed volume within the syringe barrel.

10. The syringe assembly of claim 1, wherein the tube is connected to a port extending from the syringe barrel.

11. The syringe assembly of claim 1, wherein the plunger head is configured to translate sealingly against the inner wall of the syringe barrel.

12. The syringe assembly of claim 1, wherein the IV line is configured to provide a primary medical fluid or drug to a patient, and the IV line is connected fluidly to at least one of:

(i) a container for the primary medical fluid or drug, or (ii) a patient access device.

13. The syringe assembly of claim 12, wherein the tube is connected fluidly to the syringe and to a secondary connection of a multi-way valve, such that when the multi-way valve is set to a secondary flow position, a secondary medical fluid or drug injected from the syringe through an administration connection into the IV line causes a displacement of the primary medical fluid or drug into the substantially hollow space.

14. The syringe assembly of claim 13, wherein the multi-way valve includes a normal flow position that enables the primary medical fluid or drug and the secondary medical fluid or drug to flow to the patient.

15. The syringe assembly of claim 13, wherein a portion of the displaced primary medical fluid or drug is displaced into the substantially hollow space.

16. The syringe assembly of claim 13, wherein a volume of the primary medical fluid or drug displaced at least substantially matches a volume of the secondary medical fluid or drug injected from the syringe into the IV line.

17. A syringe assembly for connecting to an intravenous (“

IV”

) line comprising;

a syringe barrel having an actuation end portion and a discharge end;

a syringe plunger moveable within the syringe barrel, the syringe plunger including a plunger head affixed to a first end of a plunger rod, the plunger head forming a sliding seal engagement with an inner wall of the syringe barrel;

a seal sealing the actuation end portion the syringe barrel, the seal forming a sliding seal engagement with the plunger rod;

wherein the syringe barrel, the syringe rod, the plunger head, and the seal are positioned and arranged to define a substantially hollow space extending from the seal to the plunger head; and

a tube in medical fluid communication with the substantially hollow space at a location between the seal and the plunger head such that a medical fluid can flow from the tube into the substantially hollow space and contact the plunger head, the tube having a distal end configured to be connected to the IV line.