Medical puncture needle and method for manufacturing puncture needle

Patent metadata

Field	Value
Publication number	US-10722264-B2
Application number	US-201815883638-A
Country	US
Kind code	B2
Filing date	Jan 30, 2018
Priority date	Jul 30, 2015
Publication date	Jul 28, 2020
Grant date	Jul 28, 2020

Abstract

A medical puncture needle includes: a distal end portion including a needle point; and a rod-like main body portion continuous with the distal end portion. The distal end portion includes a blade surface. The blade surface includes: a first blade surface portion on a front side of the distal end portion, the first blade surface portion being inclined with respect to a center axis of the main body portion and extending to the needle point, and a second blade surface portion on a back side of the distal end portion. When a virtual plane including the center axis of the main body portion is established, the second blade surface portion comprises a curved surface in which an angle with respect to the virtual plane in a cross section orthogonal to the center axis direction gradually increases toward the needle point side in the center axis direction.

First claim

What is claimed is:

1. A medical puncture needle comprising:
a distal end portion including a needle point; and
a rod-like main body portion continuous with the distal end portion,
wherein:
the distal end portion includes a blade surface, the blade surface comprises:
a first blade surface portion on a front side of the distal end portion, the first blade surface portion being inclined with respect to a center axis of the main body portion and extending to the needle point, and
a second blade surface portion on a back side of the distal end portion, and
when a virtual plane including the center axis of the main body portion is established, the second blade surface portion comprises a curved surface in which, in each of a plurality of cross-sections orthogonal to the center axis direction, there is an angle between the curved surface and the virtual plane, and said angles gradually increase toward a needle point side in the center axis direction.

2. The medical puncture needle according to claim 1 , wherein:
the blade surface comprises a third blade surface portion on the back side of the distal end portion, and
the second blade surface portion and the third blade surface portion intersect at a ridgeline that forms a blade edge having the needle point at one end.

3. The medical puncture needle according to claim 2 , wherein the third blade surface portion comprises a curved surface in which, in each of the plurality of cross-sections orthogonal to the center axis direction, there is an angle between the curved surface and the virtual plane, and said angles gradually increase toward the needle point side in the center axis direction.

4. The medical puncture needle according to claim 1 , wherein the virtual plane is in a plane perpendicular to the first blade surface portion.

5. A medical puncture needle comprising:
a distal end portion including a needle point; and
a rod-like main body portion continuous with the distal end portion,
wherein:
the distal end portion includes a blade surface,
the blade surface comprises:
a first blade surface portion on a front side of the distal end portion, the first blade surface portion being inclined with respect to a center axis of the main body portion and extending to the needle point,
a second blade surface portion on a back side of the distal end portion, and
a third blade surface portion on the back side of the distal end portion,

the second blade surface portion and the third blade surface portion intersect at a first ridgeline that forms a first blade edge having the needle point at one end,
the first blade surface portion and the second blade surface portion intersect at a second ridgeline that forms a second blade edge having the needle point at one end,
the first blade surface portion and the third blade surface portion intersect at a third ridgeline that forms a third blade edge having the needle point at one end, and
the second blade edge is curved, and the third blade edge is curved.

6. The medical puncture needle according to claim 5 , wherein an outer edge of the first blade surface portion is formed of the second blade edge, the third blade edge, and a protruding curved line-shaped main body portion side outer edge portion connecting an end of the second blade edge on the main body portion side to an end of the third blade edge on the main body portion side.

7. The medical puncture needle according to claim 6 , wherein the second blade edge and the third blade edge are connected to the main body portion side outer edge portion along a continuous curved line that does not form an apex.

Assignees

• Terumo Corp

Inventors

• Ueda Takehiko

Classifications

• B24B19/16

  for grinding sharp-pointed workpieces, e.g. needles, pens, fish hooks, tweezers or record player styli (grinding bevels on diamonds or sapphires B24B9/16; polishing of needles B24B29/08) · CPC title

• B21G1/08

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

• A61M25/0606

  "Over-the-needle" catheter assemblies, e.g. I.V. catheters · CPC title

• A61M5/3286 Primary

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

• A61M5/32

  Needles; Details of needles pertaining to their connection with syringe or hub (infusion needles A61M5/158); Accessories for bringing the needle into, or holding the needle on, the body {(A61M5/42, A61M5/46 take precedence; guide needles for catheters A61M25/065)}; Devices for protection of needles {(apparatus specially adapted for cleaning or sterilising needles A61M5/001)} · CPC title