Anesthesia conduction catheter for delivery of electrical stimulus

• US 7,805,188 B2
• Filed: 03/10/2004
• Issued: 09/28/2010
• Est. Priority Date: 03/24/2000
• Status: Active Grant

• Current Assignee: B Braun Medical Incorporated (B. Braun Holding GmbH & Co. KG)
• Original Assignee: Micor Inc.
• Inventors: Brushey, Stephen
• Primary Examiner(s): Lucchesi; Nicholas D
• Assistant Examiner(s): Bouchelle; Laura A
• Application Number:
  US10/797,958
• Publication Number:
  US 20040210295A1
• Time in Patent Office: 2,393 Days
• Field of Search: 604/21, 604/19, 604/20
• US Class Current: 604/21
• CPC Class Codes: A61M 19/00 Local anaesthesia syringes therefor A61M5/00; Hypothermia A61M5/42 takes precedence; cooling blood in a bypass of the arterial system A61M1/36
• CPC Class Codes: A61M 2025/0007 Epidural catheters
• CPC Class Codes: A61M 2025/0042 Microcatheters, cannula or the like having outside diameters around 1 mm or less
• CPC Class Codes: A61M 2025/0057 Catheters delivering medicament other than through a conventional lumen, e.g. porous walls or hydrogel coatings
• CPC Class Codes: A61M 2025/0063 having means, e.g. stylets, mandrils, rods or wires to reinforce or adjust temporarily the stiffness, column strength or pushability of catheters which are already inserted into the human body
• CPC Class Codes: A61M 25/001 Forming the tip of a catheter, e.g. bevelling process, join or taper
• CPC Class Codes: A61M 25/005 with embedded materials for reinforcement, e.g. wires, coils, braids
• CPC Class Codes: A61M 25/0053 having a variable stiffness along the longitudinal axis, e.g. by varying the pitch of the coil or braid
• CPC Class Codes: A61M 25/01 Introducing, guiding, advancing, emplacing or holding catheters A61M25/10 takes precedence
• CPC Class Codes: A61N 1/0551 Spinal or peripheral nerve electrodes

Abstract

A catheter is comprised of a flexible cylindrical tube defining a proximal portion and a distal portion terminating in a distal tip. The tube has a plurality of openings formed therethrough to form a diffusion area. The catheter includes a conductive end cap enclosing a distal tip. A flexible conductive member is attached to the conductive end cap and extends to the proximal portion where it is attached to the inside diameter of the flexible tube. The member is movable within the tube. Because of the rules governing abstracts, this abstract should not be relied upon in construing the claims.

Claims

1. A stimulating catheter, comprising:

a flexible cylindrical tube defining an inner diameter, a proximal portion and a distal portion terminating in an open distal tip, said tube having a plurality of openings formed therethrough;

a dome-shaped conductive end cap closing said open distal tip of said tube;

said end cap having a maximum outer diameter not greater than the inner diameter of said tube, and

a flexible conductive member attached at one end to said conductive end cap and running the length of said tube.

2. The catheter of claim 1 wherein said tube has an inner diameter between 0.005 in. (0.127 mm) and 0.025 in. (0.635 mm).

3. The catheter of claim 1 wherein said tube has an outer diameter between 28 gauge and 16 gauge.

4. The catheter of claim 1 wherein said plurality of openings define a diffusion area.

5. The catheter of claim 4 wherein the length of said diffusion area is between 0.5 in. (1.27 cm) and 20 in. (50.8 cm).

6. The catheter of claim 1 having between 2 and 100 openings.

7. The catheter of claim 1 wherein said openings are offset between 0°

-360°

circumferentially from adjacent said openings.

8. The catheter of claim 1 wherein said openings are arranged into rows.

9. The catheter of claim 1 wherein said openings are spaced between 2 and 300 mm from adjacent said openings.

10. The catheter of claim 1 further including a window for visualizing flashback.

11. The catheter of claim 1 wherein said flexible cylindrical tube comprises sterilizable plastic.

12. The catheter of claim 11 wherein said sterilizable plastic is selected from the group consisting of polyurethanes, low density polyethylene, high density polyethylene, polypropylene, polystyrene, polycarbonate, polytetrafluoroethylene, tetrafluoroethylene, fluorinated ethylene propylene and polyamides.

13. The catheter of claim 11 wherein said sterilizable plastic comprises polyamide and copolymers thereof.

14. The catheter of claim 11 wherein said sterilizable plastic comprises polyurethane which further includes at least one siloxane.

15. The catheter of claim 1 wherein said flexible conductive member is made from a material selected from the group consisting of stainless steel, titanium, nickel-titanium and conductive plastic filament.

16. The catheter of claim 1 wherein the shape of said flexible conductive member is selected from the group consisting of coil, strip, ribbon, filament, braid or mesh.

17. The catheter of claim 16 wherein said coil is formed of a wire having a diameter of between 0.001 in (0.0254 mm) and 0.003 in (0.0762 mm) and having a pitch between 0.009 in (0.2286 mm) and 0.015 in (0.381 mm) between adjacent coils.

18. The catheter of claim 1, wherein said conductive member is additionally attached to an inside diameter of said tube at said proximal portion so as to form an annular area between an outside diameter of said coil and said inside diameter of said tube, said coil having adjacent turns spaced to enable fluid to leak into said annular area.

19. The catheter of claim 18 wherein said tube has an inner diameter between 0.005 in. (0.127 mm) and 0.025 in. (0.635 mm).

20. The catheter of claim 18 wherein said tube has an outer diameter between 28 gauge and 16 gauge.

21. The catheter of claim 18 wherein said plurality of openings define a diffusion area.

22. The catheter of claim 21 wherein the length of said diffusion area is between 0.5 in. (1.27 cm) and 20 in. (50.8 cm).

23. The catheter of claim 18 having between 2 and 100 openings.

24. The catheter of claim 18 wherein said openings are offset between 0°

-360°

circumferentially from adjacent said openings.

25. The catheter of claim 18 wherein said openings are arranged into rows.

26. The catheter of claim 18 wherein said openings are spaced between 2 and 300 mm from adjacent said openings.

27. The catheter of claim 18 further including a window for visualizing flashback.

28. The catheter of claim 18 wherein said flexible cylindrical tube comprises sterilizable plastic.

29. The catheter of claim 18 wherein said sterilizable plastic is selected from the group consisting of polyurethanes, low density polyethylene, high density polyethylene, polypropylene, polystyrene, polycarbonate, polytetrafluoroethylene, tetrafluoroethylene, fluorinated ethylene propylene and polyamides.

30. The catheter of claim 18 wherein said sterilizable plastic comprises polyamide and copolymers thereof.

31. The catheter of claim 18 wherein said sterilizable plastic comprises polyurethane which further includes at least one siloxane.

32. The catheter of claim 18 wherein said coil is made from a material selected from the group consisting of stainless steel, titanium, nickel-titanium and conductive plastic filament.

33. The catheter of claim 18 wherein said coil is formed of a wire having a diameter between 0.001 in (0.0254 mm) and 0.003 in (0.0762 mm) and having a pitch between 0.009 in (0.2286 mm) and 0.015 in (0.381 mm) between adjacent coils.