COAXIAL VENAL CANNULA

• US 20090005725A1
• Filed: 06/25/2008
• Published: 01/01/2009
• Est. Priority Date: 06/26/2007
• Status: Active Grant

• Current Assignee: Nordson Corporation
• Original Assignee: Avalon Laboratories, Inc..
• Inventors: Shorey, Frederick A.
• Granted Patent: US 9,233,223 B2
• Time in Patent Office: Days
• US Class Current: 604/43
• CPC Class Codes: A61M 1/1698 Blood oxygenators with or without heat-exchangers intracorporal A61M1/1678; manufacturing of membranes therefor B01D67/00; semi-permeable membranes for separation processes characterised by their properties B01D69/00; semi-permeable membranes characterised by their material B01D71/00
• CPC Class Codes: A61M 1/3653 Interfaces between patient blood circulation and extra-corporal blood circuit
• CPC Class Codes: A61M 1/3659 Cannulae pertaining to extracorporeal circulation
• CPC Class Codes: A61M 2025/0004 having two or more concentrically arranged tubes for forming a concentric catheter system
• CPC Class Codes: A61M 2025/0031 characterized by lumina for withdrawing or delivering, i.e. used for extracorporeal circuit treatment
• CPC Class Codes: A61M 2025/0039 characterized by lumina being arranged coaxially
• CPC Class Codes: A61M 2039/1077 Adapters, e.g. couplings adapting a connector to one or several other connectors
• CPC Class Codes: A61M 2039/1088 having a plurality of male connectors, e.g. Luer connectors
• CPC Class Codes: A61M 2207/00 Methods of manufacture, assembly or production
• CPC Class Codes: A61M 25/0026 Multi-lumen catheters with stationary elements catheter assemblies comprising a catheter in combination with a guide tube, sheath or sleeve A61M2025/0681; catheters comprising telescoping coaxial elements A61M2025/0175
• CPC Class Codes: A61M 25/0029 characterized by features relating to least one lumen located at the middle part of the catheter, e.g. slots, flaps, valves, cuffs, apertures, notches, grooves or rapid exchange ports catheter shaft surface irregularities A61M2025/006
• CPC Class Codes: A61M 25/0043 characterised by structural features
• CPC Class Codes: A61M 25/005 with embedded materials for reinforcement, e.g. wires, coils, braids
• CPC Class Codes: A61M 25/0069 Tip not integral with tube
• CPC Class Codes: A61M 25/007 Side holes, e.g. their profiles or arrangements; Provisions to keep side holes unblocked
• CPC Class Codes: A61M 25/0097 characterised by the hub connectors A61M39/10
• CPC Class Codes: Y10T 29/49947 by applying separate fastener

Abstract

A dual lumen cannula includes a first tube defining a return lumen and having a proximal end, a mid-portion and a distal end, wherein the distal end includes a return aperture. A second tube is coaxial with the first tube and has a proximal end and a distal end, wherein the distal end of the second tube is fixedly attached to the mid-portion of the first tube and wherein the distal end includes a drainage aperture. A drainage lumen is defined by the space between the first tube and the second tube. A connector is attached to the proximal end of the second tube. The connector includes a reservoir for receiving fluid from the proximal end of the second tube. The first tube extends through the connector and does not attach directly with the second tube at the connector, and the first tube remains substantially coaxial with the second tube throughout the length of the second tube.

Claims

1. A dual lumen cannula assembly comprising:

an infusion tube defining a return lumen and having a first outer circumference, a proximal end, and a distal end that includes a return aperture;

a drainage tube co-axially aligned with said infusion tube and having a second outer circumference, a proximal end and a distal end, wherein said distal end of said drainage tube includes a drainage site having a drainage aperture and wherein the length of said drainage tube is less than the length of said infusion tube;

a drainage lumen defined by a space between said infusion tube and said drainage tube;

a connector attached to said proximal end of said drainage tube and having a reservoir for receiving fluid from said proximal end of said drainage tube, wherein said infusion tube extends through said connector and does not attach with said drainage tube at said connector, and further wherein said infusion tube remains substantially coaxial with said drainage tube throughout the length of said drainage tube.

2. The dual lumen cannula assembly of claim 1, wherein:

said connector includes a return opening that is attached to said proximal end of said infusion tube.

3. The dual lumen cannula assembly of claim 2, wherein:

at least a portion of said drainage tube includes a wall having a reinforcing coil.

4. The dual lumen cannula assembly of claim 3, further comprising:

at least a portion of said infusion tube includes a wall having a reinforcing coil.

5. The dual lumen cannula assembly of claim 4, wherein:

said drainage site includes a drainage member having first and second ends, wherein said first end is attached to said distal end of said drainage tube, and wherein said second end is attached to the first outer circumference of said infusion tube.

6. The dual lumen cannula assembly of claim 5, further comprising:

an infusion basket disposed on said distal end of said infusion tube.

7. The dual lumen cannula assembly of claim 6, further comprising:

a transition piece adjacent said drainage site and connected to the first outer circumference of said infusion tube.

8. The dual lumen cannula assembly of claim 7, further comprising:

an introducer adapted for insertion into said return lumen of said infusion tube.

9. The dual lumen cannula assembly of claim 1, wherein:

said drainage tube includes a wall having a reinforcing coil that extends from said proximal end of said drainage tube to said distal end of said drainage tube.

10. The dual lumen cannula assembly of claim 1, further comprising:

said infusion tube includes a wall having a reinforcing coil that extends from said proximal end of said infusion tube to said distal end of said infusion tube.

11. The dual lumen cannula assembly of claim 1, wherein:

said drainage site includes a drainage member having first and second ends, wherein said first end is attached to said distal end of said drainage tube, and wherein said second end is attached to the first outer circumference of said infusion tube.

12. The dual lumen cannula assembly of claim 1, further comprising:

an infusion basket disposed on said distal end of said infusion tube.

13. The dual lumen cannula assembly of claim 1, further comprising:

a transition piece adjacent said drainage site and connected to the first outer circumference of said infusion tube.

14. The dual lumen cannula assembly of claim 1, further comprising:

an introducer adapted for insertion into said return lumen of said infusion tube.

15. The dual lumen cannula assembly of claim 1, wherein:

said drainage site is integral with said distal end of said drainage tube.

17. The improvement of claim 10, wherein:

an outside circumference of said proximal end of said drainage tube is larger than the outside circumference of said drainage tube at said distal end.

18. The improvement of claim 10, further comprising:

an infusion basket disposed on said distal end of said infusion tube.

19. The improvement of claim 10, further comprising:

a drainage opening fluidly connected with said reservoir and adapted for engagement with a drainage line attached to an oxygenation device.

16. In a dual lumen cannula assembly having an infusion tube with a distal end and a

proximal end, and a drainage tube with a distal end and a proximal end, wherein the drainage tube is co-axially aligned with the infusion tube, the improvement comprising:

a connector having a reservoir, a connector aperture that is fluidly connected to a mouth on a proximal end of said drainage tube, and a return opening on said connector, wherein the outside circumference of said infusion tube is attached to said return opening;

a drainage member connected to said distal end of said drainage tube and further connected to the outside circumference of said first small tube between said proximal and distal ends of said small tube, said drainage member including at least one drainage aperture;

a return aperture disposed adjacent to said distal end of said infusion tube.

20. A method of making a cannula assembly, comprising:

forming an elongate flexible infusion tube having a proximal end and a distal end;

forming an elongate flexible drainage tube having a proximal end and a distal end;

forming a connector having a return opening, and a connector aperture;

inserting said elongate infusion tube into said return opening and out said connector aperture;

attaching said infusion tube to said return opening of said connector;

connecting a distal end of said elongate return tube to a mid-portion of said elongate infusion tube;

installing a drainage site having at least one drainage aperture at said distal end of said elongate return tube; and

installing an infusion site having at least one infusion aperture at said distal end of said elongate infusion tube.

21. The method set forth in claim 20, further comprising:

installing a reinforcing coil in a wall of said drainage tube.

22. The method set forth in claim 20, further comprising:

installing a reinforcing coil in a wall of said infusion tube.

23. The method set forth in claim 20, further comprising:

installing a reservoir in said connector fluidly connected to a mouth on said drainage tube.