Medical puncture needle and method of manufacturing puncture needle

Patent metadata

Field	Value
Publication number	US-10201665-B2
Application number	US-201615205896-A
Country	US
Kind code	B2
Filing date	Jul 8, 2016
Priority date	Jan 31, 2014
Publication date	Feb 12, 2019
Grant date	Feb 12, 2019

Abstract

A medical puncture needle includes an end portion including a needle tip; and a main body portion contiguous with the end portion, having a substantially circular cross-sectional outer shape. The end portion includes a first bevel formed by a curved surface, the bevel having an angle that gradually decreases toward the needle tip in an axial direction, in a cross-section orthogonal to the axial direction, relative to an imaginary plane that extends along an axis of the main body portion.

First claim

What is claimed is:

1. A medical puncture needle comprising:
an end portion including a needle tip; and
a main body portion contiguous with the end portion, having a substantially circular cross-sectional outer shape,
wherein, in a side view of the medical puncture needle, the needle tip is located on a line that extends along an outer surface of the main body portion in a direction parallel to an axis of the main body portion, and
wherein the end portion includes:
a first bevel formed by a first helical surface that extends to the needle tip and twists so as to have an angle that gradually decreases toward the needle tip in an axial direction, in a cross-section orthogonal to the axial direction, relative to an imaginary plane that extends along the axis of the main body portion, and
a second bevel formed by a second helical surface that extends to the needle tip and twists so as to have an angle that gradually decreases toward the needle tip in an axial direction, in a cross-section orthogonal to the axial direction, relative to an imaginary plane that extends along the axis of the main body portion,
wherein the first and second bevels define a first cutting edge constituted by a first ridge formed where the first and second bevels intersect, the first ridge defining the needle tip at one end thereof.

2. The puncture needle according to claim 1 ,
wherein the end portion includes an inclined surface contiguous with the first and second bevels and constituted by a flat surface that is inclined with respect to the axis, and
the imaginary plane is perpendicular to the inclined surface.

3. The puncture needle according to claim 2 ,
wherein the needle tip is not positioned on the imaginary plane perpendicular to the inclined surface and including the axis.

4. The puncture needle according to claim 2 ,
wherein the puncture needle has a hollow portion extending from the main body portion to the end portion, and
the first and second bevels each have an inner edge defining an opening at one end of the hollow portion in the axial direction at the end portion.

5. The puncture needle according to claim 3 ,
wherein the puncture needle has a hollow portion extending from the main body portion to the end portion, and
the first and second bevels each have an inner edge defining an opening at one end of the hollow portion in the axial direction at the end portion.

6. The puncture needle according to claim 1 ,
wherein the puncture needle has a hollow portion extending from the main body portion to the end portion, and
the first and second bevels each have an inner edge defining an opening at one end of the hollow portion in the axial direction at the end portion.

7. The puncture needle according to claim 6 ,
wherein the first cutting edge is located on a tip side of the opening in the axial direction, and
wherein the first and second bevels define a second cutting edge located on a main body portion side of the opening in the axial direction, the second cutting edge being constituted by a second ridge formed where the first and second bevels intersect.

8. The puncture needle according to claim 1 , wherein an angle change rate of the angle is constant per unit length in the axial direction.

9. The puncture needle according to claim 1 , wherein the imaginary plane includes the first cutting edge and the axis of the main body portion.

10. The puncture needle according to claim 1 , wherein an outer edge of the first bevel defines a second cutting edge, and an outer edge of the second bevel defines a third cutting edge.

Assignees

• Terumo Corp

Inventors

• Oyauchi Tetsuya
• Nishiuchi Daisuke

Classifications

• A61M5/3286 Primary

  Needle tip design, e.g. for improved penetration · CPC title

• A61M2207/00

  Methods of manufacture, assembly or production · CPC title

• B21G1/08

  of hollow needles or needles with hollow end, e.g. hypodermic needles, larding-needles (B21G1/10 takes precedence) · CPC title

• A61M5/158

  Needles {for infusions; Accessories therefor, e.g. for inserting infusion needles, or for holding them on the body} · CPC title

• B21G1/12

  Securing, cleaning-off burrs, reconditioning polishing, grinding (takes precedence over B21G1/02 - B21G1/10) · CPC title