Coaxial venal cannula

• US 9,233,223 B2
• Filed: 06/25/2008
• Issued: 01/12/2016
• Est. Priority Date: 06/26/2007
• Status: Active Grant

• Current Assignee: Nordson Corporation
• Original Assignee: Nordson Corporation
• Inventors: Shorey, Frederick A.
• Primary Examiner(s): Sirmons, Kevin C
• Assistant Examiner(s): PATEL, SHEFALI DILIP
• Application Number:
  US12/145,738
• Publication Number:
  US 20090005725A1
• Time in Patent Office: 2,757 Days
• Field of Search: 604/158, 604/164.01, 604/27, 604/43, 604/524, 604/526
• US Class Current: 1/1
• 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 of the second tube includes a drainage aperture. A drainage lumen is defined by a 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 a 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 a length of the second tube.

Claims

1. A dual lumen cannula assembly comprising:

an infusion tube defining a return lumen and having a body portion, a proximal end, and a distal end that includes a return aperture, wherein a diameter of said proximal end of said infusion tube is greater than a diameter of said body portion of said infusion tube;

a drainage tube co-axially aligned with said infusion tube and having a body portion, 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 a length of said drainage tube is less than a length of said infusion tube, and wherein a diameter of said proximal end of said drainage tube is greater than a diameter of a substantial portion of said body portion of said drainage tube;

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

a connector extending into and attached with said proximal end of said drainage tube and having a reservoir for receiving a fluid from said proximal end of said drainage tube, wherein said infusion tube extends through said connector, and wherein the diameter of the body portion of said infusion tube gradually tapers across the connector as the infusion tube extends through the connector from a proximal end of the connector to a distal end of the 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:

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

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

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

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

the reinforcing coil of the infusion tube is disposed in the wall of the infusion tube at a location where the infusion tube extends through said connector.

5. 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.

6. 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.

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

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

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

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

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

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

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

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

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

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