RECIRCULATION MINIMIZING CATHETER

• US 20090187141A1
• Filed: 10/20/2008
• Published: 07/23/2009
• Est. Priority Date: 10/19/2007
• Status: Active Grant

• Current Assignee: AngioDynamics, Inc.
• Original Assignee: Navilyst Medical Incorporated (AngioDynamics, Inc.)
• Inventors: Lareau, Raymond, Wolfson, Mark
• Granted Patent: US 8,337,451 B2
• Time in Patent Office: Days
• US Class Current: 604/43
• CPC Class Codes: A61M 2025/0031 characterized by lumina for withdrawing or delivering, i.e. used for extracorporeal circuit treatment
• CPC Class Codes: A61M 2025/0037 characterized by lumina being arranged side-by-side
• CPC Class Codes: A61M 2025/0073 Tip designed for influencing the flow or the flow velocity of the fluid, e.g. inserts for twisted or vortex flow general flow characteristics A61M2206/10
• CPC Class Codes: A61M 25/003 characterized by features relating to least one lumen located at the distal part of the catheter, e.g. filters, plugs or valves catheter tips A61M25/0067
• CPC Class Codes: A61M 25/0032 characterized by at least one unconventionally shaped lumen, e.g. polygons, ellipsoids, wedges or shapes comprising concave and convex parts
• CPC Class Codes: A61M 25/0068 Static characteristics of the catheter tip, e.g. shape, atraumatic tip, curved tip or tip structure
• CPC Class Codes: A61M 25/007 Side holes, e.g. their profiles or arrangements; Provisions to keep side holes unblocked
• CPC Class Codes: Y10T 29/49826 Assembling or joining

Abstract

A flow control tip for a catheter comprises a partition dividing the catheter into first and second lumens, a first orifice fluidly connected to the first lumen and a second orifice fluidly connected to the second lumen, the first orifice being proximal to the second orifice, an elongate protrusion extending along a portion of the partition substantially along a centerline of the elongated body and a deflecting surface extending at an angle relative to the protrusion to direct flow from the first orifice away from the centerline.

Claims

1. A flow control tip for a catheter, comprising:

a partition dividing the catheter into first and second lumens;

a first orifice fluidly connected to the first lumen and a second orifice fluidly connected to the second lumen, the first orifice being proximal to the second orifice;

an elongate protrusion extending along a portion of the partition substantially along a centerline of the elongated body; and

a deflecting surface extending at an angle relative to the protrusion to direct flow from the first orifice away from the centerline.

2. The flow control tip according to claim 1, further comprising a substantially cylindrical outer shell defining an outer wall of the first and the second lumens.

3. The flow control tip according to claim 1, wherein the deflecting surface is located approximately halfway between the first and the second orifices.

4. The flow control tip according to claim 1, wherein the protrusion protrudes substantially equally in the first and the second lumens.

5. The flow control tip according to claim 1, wherein the protrusion is substantially hemispherical in cross-section, a radius of the protrusion being smaller than a radius of the elongated body.

6. The flow control tip according to claim 1, wherein the deflecting surface includes a first portion extending from an outermost extent of the protrusion toward the partition in a proximal to distal direction and a second portion extending away from the partition toward the outermost extent of the protrusion.

7. The flow control tip according to claim 1, the protrusion comprising a third lumen includes a radial opening located between the first and the second orifices.

8. A method for forming a catheter tip, comprising:

extruding a tip blank comprising a first opening fluidly connected to a first lumen and a second opening fluidly connected to a second lumen formed in a distal end of the tip blank, the first opening being separated from the distal end along a longitudinal axis of the tip blank by a stagger distance;

forming a protrusion substantially along a centerline of a partition separating the first and second lumens from one another;

removing a first portion of an outer wall of the tip blank surrounding the first lumen along at least a portion of the tip blank distally of the first opening; and

removing a portion of the protrusion to form a first flow deflecting surface angled away from the partition in a proximal to distal direction.

9. The method according to claim 8, further comprising removing a second portion of the protrusion to form a second deflecting surface angled toward the partition in a proximal to distal direction, the second deflecting surface being located immediately proximal to the first deflecting surface.

10. The method according to claim 8, wherein the deflecting surface is skived into the protrusion.

11. A tip for a catheter, comprising:

an outer wall defining first and second lumens separated from one another by a partition;

a first opening at a distal end of the tip on a first side of the partition opening the first lumen to an exterior of the tip, the outer wall at the first opening defining a first acute angle with the partition so that a proximal end of the first opening is located proximally of the distal end of the tip; and

a second opening at the distal end of the tip on a second side of the partition opening the second lumen to the exterior of the tip, the outer wall at the second opening defining a second acute angle with the partition so that a proximal end of the second opening is located proximally of the distal end of the tip.

12. The catheter tip according to claim 11, wherein the first opening is formed in a plane extending at the first acute angle relative to the partition.

13. The catheter tip according to claim 11, wherein the first opening is formed along a curve intersecting the partition at the first acute angle.

14. The catheter tip according to claim 11, wherein the first acute angle is between 10°

and 85°

.

15. The catheter tip according to claim 11, further comprising a third opening located proximally of the first opening on the first side of the partition opening the first lumen to an exterior of the tip.

16. The catheter tip according to claim 15, further comprising a fourth opening located proximally of the second opening on the second side of the partition opening the second lumen to an exterior of the tip.

17. The catheter tip according to claim 15, wherein a periphery of a proximal portion of the third opening extends substantially in a plane extending distally from a proximal end of the third opening toward the partition at a third acute angle.

18. The catheter tip according to claim 17, wherein a periphery of a distal portion of the third opening extends substantially in a plane extending proximally from a distal end of the third opening toward the partition at a fourth acute angle.

19. The catheter tip according to claim 18, wherein the proximal and distal portions of the third opening meet at points on opposite sides of a longitudinal axis of the tip separated from the partition by a predetermined distance.

20. The catheter tip according to claim 18, wherein the third acute angle is between 10°

and 85° and

the fourth acute angle is between 10° and

85°

.

21. The catheter tip according to claim 18, wherein the third and fourth acute angles are substantially equal to one another.

22. The catheter tip according to claim 16, wherein a periphery of a proximal portion of the fourth opening extends substantially in a plane extending distally from a proximal end of the fourth opening toward the partition at a fifth acute angle.

23. The catheter tip according to claim 22, wherein a periphery of a distal portion of the fourth opening extends substantially in a plane extending proximally from a distal end of the fourth opening toward the partition at a sixth acute angle.

24. The catheter tip according to claim 23, wherein the proximal and distal portions of the fourth opening meet at points on opposite sides of a longitudinal axis of the tip separated from the partition by a predetermined distance.

25. A method for making a catheter tip, comprising:

skiving a tubular body including first and second lumens separated from one another by a partition along a first acute angle extending proximally from a distal tip of the catheter tip to form a first opening opening the first lumen to an exterior of the catheter tip; and

skiving the tubular body along a second acute angle extending proximally from a distal tip of the catheter tip to form a second opening opening the second lumen to an exterior of the catheter tip.