Bidirectional flow catheter

Patent metadata

Field	Value
Publication number	US-11364333-B2
Application number	US-201816754382-A
Country	US
Kind code	B2
Filing date	Oct 10, 2018
Priority date	Oct 10, 2017
Publication date	Jun 21, 2022
Grant date	Jun 21, 2022

Abstract

Disclosed herein is a bidirectional intravascular cannula, or catheter, that is configured to provide and return blood in a patient bidirectionally. The bidirectional intravascular cannula is configured to reduce or obviate the need for a second cannula, such as currently available unidirectional cannulae, to be placed in a second or opposite direction of flow. Users would include cardiac surgeons, intensivists, vascular surgeons, ER doctors, IR doctors and cardiologist who use peripheral cannulation for ECLS or cardiopulmonary bypass. The cannula allows continued flow to a patient's limb even with the cannula proximally in the vessel. The cannula further allows larger size cannula to be placed without the need for additional distal catheter placement.

First claim

What is claimed is:

1. A bidirectional flow catheter system, comprising:
a cannula having a distal end and a proximal end opposite said distal end;
a forward flow port at said distal end of the cannula, said forward flow port configured to direct fluid from said cannula in a first direction;
a reverse flow port positioned proximally from said distal end of said cannula, said reverse flow port configured to direct fluid from said cannula in a second direction; and
a cap positioned on an exterior of said cannula and extending over said reverse flow port, wherein said cap has a convex exterior surface facing away from an outer wall of the cannula, said cap having a distal portion closest to the distal end of the cannula that fully covers the reverse flow port, and a proximal portion having a pair of proximally extending legs positioned outward from side edges of the reverse flow port.

2. The bidirectional flow catheter system of claim 1 , wherein said cap has a concave interior surface facing the outer wall of the cannula.

3. The bidirectional flow catheter system of claim 2 , wherein said concave interior surface is configured to direct fluid passing from a lumen within the cannula and through the reverse flow port in said second direction.

4. The bidirectional flow catheter system of claim 3 , wherein said second direction is opposite said first direction.

5. The bidirectional flow catheter system of claim 1 , wherein said reverse flow port defines an elliptical curve having a vertex at a distal-most edge of the reverse flow port.

6. The bidirectional flow catheter system of claim 1 , wherein said reverse flow port extends through a sidewall of the cannula to provide fluid communication between a patient's blood vessel and a lumen extending through the cannula.

7. The bidirectional flow catheter system of claim 1 , further comprising an obdurator having an outer diameter approximately equal to an interior diameter of the cannula at the distal end of the cannula so as to occlude fluid flow through the distal end of the cannula, said obdurator having a channel in a side wall of the obdurator, said channel having a distal channel end that is proximal to a distal end of the obdurator and a proximal end adjacent to a widened-diameter portion of the cannula.

8. The bidirectional flow catheter system of claim 7 , wherein said channel is positioned on said obdurator to align with said reverse flow port when the obdurator is fully inserted into the cannula.

9. The bidirectional flow catheter system of claim 7 , said cannula further comprising a luer lock in fluid communication with said channel.

10. A bidirectional flow catheter system, comprising:
a cannula having a forward flow port at a distal end thereof and a reverse flow port positioned proximally to said distal end; and
an obdurator having an outer diameter approximately equal to an interior diameter of the cannula at the distal end of the cannula, said obdurator having a channel in a side wall of the obdurator, said channel having a distal channel end that is proximal to a distal end of the obdurator and a proximal end adjacent to a widened-diameter portion of the cannula;

wherein said channel is positioned on said obdurator to align with said reverse flow port when the obdurator is fully inserted into the cannula.

11. The bidirectional flow catheter system of claim 10 , said cannula further comprise a cap positioned on an exterior of said cannula and extending over said reverse flow port.

12. The bidirectional flow catheter system of claim 11 , wherein said cap has a concave interior surface facing an outer wall of the cannula.

13. The bidirectional flow catheter system of claim 12 , wherein said concave interior surface is configured to direct fluid passing from a lumen within the cannula and through the reverse flow port in a first direction different from a second direction of fluid passing out of the distal end of the cannula.

14. The bidirectional flow catheter system of claim 13 , wherein said first direction is opposite said second direction.

15. The bidirectional flow catheter system of claim 10 , wherein said cap has a convex exterior surface facing away from an outer wall of the cannula.

16. The bidirectional flow catheter system of claim 15 , said cap having a distal portion closest to the distal end of the cannula that fully covers the reverse flow port, and a proximal portion having a pair of proximally extending legs positioned outward from side edges of the reverse flow port.

Assignees

• Univ Maryland
• Univ Of Maryland Medical System Llc
• Univ Of Maryland Medical Center Llc

Inventors

• Kon Zachary
• Ghoreishi Mehrdad
• Pasrija Chetan
• Griffith Bartley
• Bittle Gregory

Classifications

• A61M2025/0018

  having a plug, e.g. an inflatable plug for closing catheter lumens · CPC title

• A61M2025/0073

  Tip designed for influencing the flow or the flow velocity of the fluid, e.g. inserts for twisted or vortex flow · CPC title

• A61M25/007

  Side holes, e.g. their profiles or arrangements; Provisions to keep side holes unblocked · CPC title

• A61M1/3659 Primary

  Cannulae pertaining to extracorporeal circulation · CPC title

• A61M1/3666

  Cardiac or cardiopulmonary bypass, e.g. heart-lung machines · CPC title