Vascular needle

• US 20020177864A1
• Filed: 05/01/2002
• Published: 11/28/2002
• Est. Priority Date: 05/01/2001
• Status: Active Grant

• Current Assignee: Mayo Foundation For Medical Education And Research (Mayo Clinic)
• Original Assignee: Mayo Foundation For Medical Education And Research (Mayo Clinic)
• Inventors: Camrud, Allan R.
• Granted Patent: US 6,921,387 B2
• Time in Patent Office: Days
• US Class Current: 606/167
• CPC Class Codes: A61B 17/3417 Details of tips or shafts, e.g. grooves, expandable, bendable; Multiple coaxial sliding cannulas, e.g. for dilating syringe needles A61M5/32; dilators A61M29/00
• CPC Class Codes: A61B 5/150022 for capillary blood or interstitial fluid
• CPC Class Codes: A61B 5/150282 for piercing elements, e.g. blade, lancet, canula, needle
• CPC Class Codes: A61B 5/150396 Specific tip design, e.g. for improved penetration characteristics
• CPC Class Codes: A61B 5/150442 Blade-like piercing elements, e.g. blades, cutters, knives, for cutting the skin
• CPC Class Codes: A61B 5/150511 Details of construction of shaft
• CPC Class Codes: A61M 25/0606 "Over-the-needle" catheter assemblies, e.g. I.V. catheters
• CPC Class Codes: A61M 25/065 Guide needles
• CPC Class Codes: A61M 5/158 Needles for infusions; Accessories therefor, e.g. for inserting infusion needles, or for holding them on the body

Abstract

A hollow medical needle having a bevel face defining a needle tip and cutting surface that create a first incision. The needle additionally has a separate cutting blade extending outward from the needle. The blade is positioned adjacent the bevel face to create a second incision which intersects the first incision made by the bevel face cutting surface.

Claims

1. A needle comprising:

a hollow cylindrical member having a longitudinal axis and first and second ends;

a bevel face formed in a top surface of the first end of the cylindrical member, the bevel face defining at least a first cutting surface, a needle tip, and a rear portion; and

at least a first projection attached to and extending away from the cylindrical member, the first projection defining at least a second cutting surface, the first projection positioned proximal to the first end of the cylindrical member.

2. The needle of claim 1, wherein the first projection is a blade extending substantially perpendicular to the cylindrical member.

3. The needle of claim 2, wherein the blade is positioned adjacent the needle tip.

4. The needle of claim 2, wherein the blade comprises multiple cutting surfaces.

5. The needle of claim 2, wherein the blade is positioned at the rear portion of the bevel face, such that the first and second cutting surfaces are adjacent.

6. The needle of claim 2, wherein the blade comprises at least a forward edge and a rear edge, and the forward edge of the blade meets a surface of the cylindrical member at an acute angle.

7. The needle of claim 6, wherein the acute angle is between about 25 degrees and about 50 degrees.

8. The needle of claim 2, wherein the blade comprises a semicircle.

9. The needle of claim 1, further comprising a second projection on the cylindrical member, the second projection extending away from the cylindrical member and defining at least a third cutting surface, the second projection positioned proximal to the first end of the cylindrical member and spaced apart from the first projection.

10. The needle of claim 9, wherein the second projection is positioned opposite from the first projection.

11. The needle of claim 1, wherein the projection comprises first, second, and third free edges;

wherein the first free edge comprises a semicircle, the second free edge joins the first free edge at an acute angle, and the third free edge joins the second free edge at an obtuse angle;

wherein the first free edge extends into the bevel face.

12. The needle of claim 1, wherein a slot is formed in the top surface of the first end of the cylindrical member, the slot being positioned proximal to the rear portion of the bevel face, and at least one projection positioned such that it is moveable from a first position inside the hollow cylindrical member, beneath the slot, to a second position wherein the projection extends through the slot and away from the cylindrical member;

the projection defining a second cutting surface.

14. The method of claim 13, wherein the non-lateral relief incision is substantially perpendicular to the lateral incision.

15. The method of claim 13, further comprising making a second non-lateral relief incision adjacent to and connecting with the lateral incision.

17. The needle assembly of claim 16 wherein the second cutting surface is positioned substantially perpendicular to the first cutting surface.

18. The needle assembly of claim 16 wherein the second end of the first and second needle portions comprise a hub portion, wherein the hub portions fix the position of the second cutting surface relative to the first cutting surface.

19. The needle assembly of claim 16 wherein the cutting edge is a bevel blade.

13. A method for inserting a cylindrical component into a blood vessel, comprising the steps of:

inserting a needle into the vessel, the needle having a bevel face defining at least a first cutting surface, the bevel face making a lateral incision across the top of a vessel;

inserting at least a second cutting surface of the needle into the vessel, the second cutting surface making at least one non-lateral relief incision adjacent to and connecting with the lateral incision; and

inserting the cylindrical component.

16. A needle assembly comprising:

a first needle portion comprising a hollow cylindrical member having a longitudinal axis and first and second ends, and a bevel face formed in a top surface of the first end, the bevel face defining at least a first cutting surface, and a needle tip; and

a second needle portion comprising an elongate member having a longitudinal axis and first and second ends, and a cutting edge secured to the first end of the elongate member, the cutting edge defining at least a second cutting surface, the second needle portion being insertable into the first needle portion to position the second cutting surface adjacent the first end of the first needle portion.

20. A cutting member capable of being inserted into a hollow needle, the member comprising:

a elongate portion having a longitudinal axis and first and second ends;

a cutting edge secured to the first end of the elongate portion, the cutting edge defining at least a first cutting surface capable of forming an incision;

wherein the cutting member is capable of being inserted into a hollow needle in a position so that the cutting edge is positioned adjacent a bevel face of the needle and is aligned at an angle relative to the bevel face.