JP2002045423A - Puncture needle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a puncture needle which is used as a needle for ultrasonic waves or an indwelling needle for a catheter. SOLUTION: A cylindrical surface (3) on the rear side of an opening bevel end face (2) of the puncture needle (1) is provided with at least one flat surface (4) by cutting.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a puncture needle used as an ultrasonic needle or an indwelling needle for a catheter.

[0002]

2. Description of the Related Art A puncture needle used as an indwelling needle for a catheter or a needle for an ultrasonic wave is a hollow bevel needle having an open bevel end face.

[0003] In the conventional ultrasonic needle, in order to improve the echo effect of reflecting ultrasonic waves, a counterbore processing, a roughening processing, a knurling processing, and the like are performed on a cylindrical surface behind an opening bevel end face. The effect was not always enough.

In a conventional indwelling needle for a catheter, a catheter is externally fitted behind an end surface of an open bevel. Although the distal outer edge of the catheter is chamfered, the annular front end surface having a radial width still forms a step perpendicular to the cylindrical surface of the puncture needle. Since the indwelling needle for a catheter is obliquely punctured into a blood vessel with the open bevel end face directed in the puncturing direction, a catheter that forms a step on the cylindrical surface behind the rear end of the open bevel end face when inserting the catheter tip into the blood vessel wall. The annular front end surface is caught by the blood vessel wall and resists the catheter tip from entering the blood vessel. For this reason, there has been a problem that the catheter tip is left in a state where it does not surely enter the blood vessel.

[0005] A catheter indwelling needle provided with a groove extending from the end surface of the opening bevel of the puncture needle along the generatrix of the cylindrical surface is commercially available. It can only confirm that the catheter tip has entered the blood vessel, but cannot solve the problem that the catheter tip is difficult to enter the blood vessel.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and an object thereof is to provide a sufficient echo effect when used as an ultrasonic needle, and to provide a catheter for indwelling. When used as a needle, it is an object of the present invention to provide a puncture needle that can easily insert the tip of a catheter into a blood vessel.

[0007]

In order to achieve the above object, the present invention employs a flat surface parallel to the axis of the puncture needle, or a flat surface parallel to the axis of the puncture needle. In that a flat surface that slopes so as to approach the front is cut.

Since the flat surface has better ultrasonic reflectivity than the counterbore surface, the rough surface, and the knurled surface, the ultrasonic needle provided with the flat surface is more excellent in the echo effect than the conventional needle.

In the catheter indwelling needle in which the catheter is externally fitted to the puncture needle having the flat surface, the annular front end surface of the catheter sinks into the flat surface dent formed behind the rear end of the open bevel end surface and sinks into the blood vessel wall. The tip of the catheter easily enters the blood vessel, since there is no vertical step to be caught.

In order to improve the ultrasonic echo effect,
In order to easily sink the catheter tip, it is preferable that the flat surface is relatively large, for example, the front and rear width is larger than the needle diameter, and the left and right width is 50% or more of the needle diameter.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to an embodiment shown in the drawings. 1 and 2 are a plan view and a side view of a main part of a puncture needle according to an embodiment of the present invention.

As shown in FIGS. 1 and 2, the puncture needle 1 has a cylindrical surface 3 of an ordinary hollow bevel needle having an open bevel end face 2.
Is formed with a flat surface 4. When the axial center of the puncture needle 1 is horizontal and the open bevel end face 2 is directed right above, the flat face 4
Becomes horizontal. The flat surface 4 is a rectangle parallel to the axis.
The front and rear sides of the flat surface 4 are partitioned by arcuate walls 5 and 6 orthogonal to the axial direction. The front arcuate wall 5 is located slightly behind the rear end of the open bevel end surface 2.

The front-rear width of the flat surface 4 is larger than the outer diameter of the puncture needle 1, and the left-right width is 50% or more of the outer diameter of the puncture needle 1.
When the puncture needle 1 is used as an ultrasonic needle, the flat surface 4 is flat and relatively wide and returns a sufficient echo, so that monitoring is easy and reliable.

[0014]

Next, an embodiment of the indwelling needle for a catheter shown in FIGS. 3 to 6 will be described.

As shown in FIG. 3 and FIG.
Is externally fitted to the puncture needle 1 to form an indwelling needle for a catheter. At this time, behind the rear end of the open bevel end surface 2, the annular end surface 8 at the distal end of the catheter 7 is located 0.1 to 1.0 mm behind the arcuate wall 5 in front of the flat surface 4. Since the chamfered portion 9 is formed on the outer peripheral edge of the distal end of the catheter 7,
The annular front end face 8 is thin.

Since the inner diameter of the catheter 7 is slightly smaller than the outer diameter of the puncture needle 1, the catheter 7 elastically comes into close contact with the cylindrical surface 3 of the puncture needle 1. However, as shown in FIG. 4 and FIG. 5, since the upper surface of the flat surface 4 is concave, the inner diameter of the catheter 7 at that portion is smaller than the outer diameter of the cylindrical surface 3. For this reason, the front end surface 8 of the thin annular shape has a smaller outer radius at the center in the left-right direction of the flat surface 4 than the radius of the cylindrical surface 3 excluding the flat surface 4. Sinks inside. As a result, behind the rear end of the open bevel end face 2, the conventional step in which the front end face 8 of the catheter rises vertically from the cylindrical face 3 of the puncture needle 1 is eliminated.

As shown in FIG. 6, when a puncture needle 1 as an indwelling needle for a catheter is punctured into a blood vessel, the distal end of a catheter 7 located behind the rear end of the open bevel end face 2 is cut into the incision in the blood vessel wall 10. Abut However, the front end surface 8 of the catheter tip, which is perpendicular to the cylindrical surface 3, sinks into the recess of the flat surface 4, and therefore does not abut the blood vessel wall 10. Since the distal end of the catheter 7 abutting on the blood vessel wall 10 is the inclined chamfered portion 9, the distal end of the catheter 7 does not catch on the incision,
It easily passes through the blood vessel wall 10.

When the tip of the catheter 7 enters the blood vessel, the blood flows into the recess of the flat surface 4, so that it can be visually confirmed that the tip of the catheter 7 has entered the blood vessel.

Puncture needle 1 of another embodiment shown in FIGS. 7 and 8
Reference numeral 1 denotes an indwelling needle for a catheter. The flat surface 12 cut into the cylindrical surface 3 has a warhead shape. When the needle bevel is horizontal and the opening bevel end face 2 is directed upward, the front becomes a slope approaching the axis, and the externally fitted catheter 7 comes into close contact with the inclined flat face 12. The configuration and effects other than those described above are the same as those of the above-described embodiment.

Puncture needle 13 of still another embodiment shown in FIG.
Is used as an ultrasonic needle. The puncture needle 13 returns echoes from the four flat surfaces 14 because four flat surfaces 14 parallel to the axis are cut on the upper, lower, left, and right sides of the cylindrical surface 3. The configuration and effects other than those described above are the same as those of the above embodiment.

[0021]

As described above, the puncture needle of the present invention has a flat surface behind the rear end of the open bevel end surface, so that when used as an ultrasonic needle, it has a good echo effect.
When used as a catheter indwelling needle, the annular front end surface of the catheter tip that formed a step that catches on the blood vessel wall on the puncture needle cylindrical surface behind the open bevel end surface rear end sinks into a flat surface dent, Since there is no vertical step that catches on the wall, there is an excellent effect that the tip of the catheter can be easily inserted into the blood vessel.

[Brief description of the drawings]

FIG. 1 is a plan view showing a main part of a puncture needle according to an embodiment of the present invention;

FIG. 2 is a side view showing a main part of the puncture needle of FIG. 1,

FIG. 3 is a longitudinal sectional view showing a main part of an indwelling needle for a catheter using the embodiment of FIG. 1;

4 is a plan view showing a main part of the indwelling needle for a catheter in FIG. 3;

FIG. 5 is a view taken along line VV in FIG. 4;

FIG. 6 is a view showing a use state of the indwelling needle for a catheter of FIG. 3;

FIG. 7 is a view corresponding to FIG. 1 of another embodiment,

FIG. 8 is a view corresponding to FIG. 3 of another embodiment,

FIG. 9 is a view corresponding to FIG. 2 of still another embodiment,

[Explanation of symbols]

 1: puncture needle 2: open bevel end surface 3: cylindrical peripheral surface 4: flat surface 5, 6: arcuate wall 7: catheter 8: front end surface 9: chamfered portion 10: vascular wall 11: puncture needle 12: flat surface 13: puncture Needle 14: flat surface

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[Procedure amendment]

[Submission date] August 2, 2000 (2008.2)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

FIG. 2

FIG. 3

FIG. 4

FIG. 5

FIG. 6

FIG. 7

FIG. 8

FIG. 9

Claims (4)

[Claims] At least one flat surface (4, 12, 14) on the cylindrical surface (3) behind the open bevel end surface (2).
Puncture needles (1, 11,
13). 2. The puncture needle according to claim 1, wherein the flat surface is parallel to the axis or inclined so that the front approaches the axis. 1
3). 3. The flat surfaces (4, 12) are located behind the rear end of the open bevel end surface, and the annular front end surface (8) of the externally fitted catheter (7) has a lateral direction on the flat surface (4). The puncture needle (1, 11) according to claim 1 or 2, characterized in that the outer radius at the center of the cylindrical surface is smaller than the radius of the cylindrical surface (3) excluding the flat surface. 4. The puncture needle (1, 11) according to claim 3, characterized in that the front end face (8) is located 0.1 to 1.0 mm behind the front edge of the flat face (4, 12). .