Fluid conveyance safety devices, methods, and systems

Patent metadata

Field	Value
Publication number	US-10391229-B2
Application number	US-201514945758-A
Country	US
Kind code	B2
Filing date	Nov 19, 2015
Priority date	Oct 26, 2010
Publication date	Aug 27, 2019
Grant date	Aug 27, 2019

Abstract

The disclosed subject matter includes a structure and method for making a dual-lumen needle from single lumen needles to take advantage of the much higher economies of scale. Variations include two needles joined by a flow junction and one needle and a single cannula joined by a flow junction. In addition disclosed are methods of using a dual-lumen needle in a two needle access for blood treatment is disclosed in which at least venous flow is provided through a dual-lumen needle with arterial flow just sufficient to provide air infiltration detection in the event of withdrawal of the dual-lumen needle.

First claim

What is claimed is:

1. A method of providing vascular access, the method comprising:
withdrawing blood from a patient through a first cannula;
infusing blood into a patient through a second cannula;
withdrawing blood through a secondary channel affixed to the second cannula such that a withdrawal of the second cannula from the patient is necessarily attended by a disruption of fluid communication through the loss of patency;
generating an alarm signal responsively to air being drawn into the secondary channel.

2. The method of claim 1 , wherein the second cannula is part of a dual lumen needle.

3. The method of claim 1 , wherein said generating an alarm signal includes passing blood resulting from said withdrawing blood through a secondary channel through an air detector.

4. The method of claim 1 , further comprising infusing blood through a second channel affixed to the first cannula.

5. The method of claim 1 , wherein the secondary channel and the second cannula are coaxial cannulae.

6. The method of claim 1 , wherein the first cannula is a dual lumen cannula.

7. The method of claim 1 , wherein blood withdrawn through the first cannula and the secondary channel are combined into a single flow and conveyed to an air detector.

8. The method of claim 1 , wherein blood withdrawn through the first cannula and the secondary channel are pumped through a junction to form a single flow which is conveyed to an air detector.

9. The method of claim 8 , further comprising conveying the blood from the air detector to a blood treatment device.

10. A vascular access device, comprising:
a blood circuit having an arterial blood line and a venous blood line;
the venous blood line being connected to a first access needle and the arterial blood line being connected to a second access needle;
the venous blood line being connected to an access component affixed to the second access needle and configured such that when the second access needle is used to infuse blood into a patient, the access component is positioned to withdraw blood and convey it into the venous line.

11. The device of claim 10 , wherein second access needle a dual-lumen needle and the access component is a lumen of the dual-lumen needle.

12. The device of claim 10 , wherein the second access needle includes a dual lumen needle set and the access component is a lumen thereof.

13. The device of claim 10 , wherein the blood circuit is shaped to be engaged the venous blood line to a predefined blood pump in a predefined orientation that causes blood to be drawn from the first access needle when the pump is operated.

14. The device of claim 10 , wherein the venous blood line is connected to the access component through a tube junction.

15. A vascular access device, comprising:
a blood circuit having an arterial blood line and a venous blood line; the venous blood line being connected to a first access needle and the arterial blood line being connected to a second access needle;
the venous blood line being connected to an access component affixed to the second access needle and configured such that when the second access needle is used to infuse blood into a patient, the access component is positioned to withdraw blood and convey it to an air detector.

16. A needle set for a two needle vascular access, comprising:
a dual-lumen needle with arterial and venous ports;
a single lumen needle with an arterial port; and
an arterial line with an arterial connector connected to the single lumen needle arterial port and the dual-lumen needle arterial port;
a venous line with a venous connector connected to the venous port.

Assignees

• Nxstage Medical Inc

Inventors

• Turk Jr Joseph E
• Burbank Jeffrey H
• Brugger James M

Classifications

• A61M1/3659 Primary

  Cannulae pertaining to extracorporeal circulation · CPC title

• A61M5/365

  Air detectors (A61M5/1684 takes precedence; in extracorporeal blood circuits A61M1/3626) · CPC title

• A61M2005/1586

  Holding accessories for holding infusion needles on the body · CPC title

• A61M5/1582 Primary

  Double lumen needles · CPC title

• A61M1/3656

  Monitoring patency or flow at connection sites; Detecting disconnections · CPC title