JP3053402U - Sheath dilator - Google Patents

Abstract

(57) Abstract: A sheath dilator capable of reducing the contact area between the tip of an expanding needle and a tissue and a blood vessel at a puncture site of a patient to reduce adhesion and further reduce puncture resistance during insertion. To provide. A dilation needle is mounted in a sheath, a tapered surface of the dilation needle is exposed from a sheath tip, and a plurality of grooves are formed on the tapered surface in a length direction of the dilation needle.
Or the sheath dilator 1 on which the projections 11 are formed.

Description

[Detailed description of the invention]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a sheath dilator comprising a dilatation needle and a sheath used for inserting a catheter placed in a vein or an artery.

[0002]

[Problems to be solved by conventional techniques and devices]

 A catheter is introduced into a vein or artery for infusion or diagnosis. For catheter insertion, a guide wire is inserted into the blood vessel after puncturing the blood vessel with an indwelling needle, and then a passage to the blood vessel is secured and expanded using a dilating needle or sheath dilator. The dilatation needle preferably has a low puncture resistance and can be inserted smoothly so as not to damage blood vessels and tissues, and a dilation needle with a reduced step from the sheath or a dilation needle with a bulge at the tip has been developed. In addition, thermoplastic resins such as fluorocarbon resins, polypropylene, and polyethylene are widely used for conventional expansion needles, and the distal end of the expansion needle is tapered so that the distal end is the thinnest. However, these extended needles have a large contact area between the distal end portion thereof and the tissue or blood vessel of the patient, so that the distal end portion is in close contact with the patient and the puncture resistance at the time of insertion is large, causing pain to the patient. As a result of intensive studies to solve the above problems, the present inventors have arrived at the following invention.

[0003]

[Means for Solving the Problems]

 [1] In the present invention, the dilatation needle 2 is mounted in the sheath 3 and the tapered surface 6T of the dilation needle tip 6 is exposed from the sheath tip 9; The sheath dilator 1 formed with 10 is provided. [2] In the present invention, the extension needle 2 is mounted in the sheath 3 and the tapered surface 6T of the extension needle tip 6 is exposed from the sheath tip 9, and a plurality of protrusions are formed on the tapered surface 6T in the length direction of the extension needle 2. 11 is provided. [3] The present invention provides the sheath dilator 1 according to [1], wherein the groove 10 is formed from 6TM on the tapered surface 6T to the end 6TE of the tapered surface 6T or from 6TM on the tapered surface to the rear end 6B. provide. [4] The present invention provides the sheath dilator 1 according to [2], in which the projection 11 is formed from 6TM on the tapered surface 6T to the end 6TE of the tapered surface 6T or from 6TM on the tapered surface to the last end 6B. provide.

[0004]

[Embodiment of the invention]

 FIG. 1 is a schematic view of the sheath dilator 1 of the present invention, FIG. 2 is a cross-sectional view showing an example near the tip of FIG. 1, and FIG. The sheath dilator 1 has the extension needle 2 mounted in the sheath 3 and exposes the tapered surface 6T of the tapered extension needle tip 6 from the sheath tip 9. As the constituent material of the expansion needle 2 constituting the sheath dilator 1 of the present invention, a fluororesin, a thermoplastic resin such as polypropylene, polyethylene or the like is used similarly to the conventional expansion needle, and the constituent material of the sheath 3 is a fluororesin or polyamide. And thermoplastic resins such as polyethylene and polypropylene. The distal end 9A of the sheath distal end 9 is formed in a tapered shape, and the inner surface thereof is formed so as to be in close contact with the outer surface of the dilation needle 4. A plurality of grooves 10 are formed on the tapered surface 6T of the distal end of the expansion needle 6 along the length direction of the expansion needle 2. In addition, as shown in FIG. 4 (a cross-sectional view showing another example near the front end in FIG. 1) and FIG. 5 (a cross-sectional view taken along the line BB in FIG. I can do it.

The groove 10 (projection 11) may be formed from the leading end 6 A to the trailing end 6 B of the distal end 6 of the expansion needle, or may be formed only in the tapered surface 6 T. Preferably, it is formed from 6TM on the tapered surface 6T to the end 6TE of the tapered surface 6T or from 6TM on the tapered surface to the rear end 6B. It is not preferable to form the groove 10 (projection 11) up to the tip 6A because the thickness of the tip 6A becomes thin and the strength is reduced. It is not preferable to form the sheath distal end 9A in the vicinity of the distal end 9A beyond the rear end 6B because the adhesiveness with the sheath distal end 9 deteriorates. The groove 10 or the protrusion 11 formed on the expansion needle 2 may have any shape, but the groove is more preferable from the viewpoint of ease of molding and strength.

[0006]

[Effects of the invention]

 As described above, by forming a plurality of grooves 10 (projections 11) on the tapered surface 6T of the dilation needle tip 6 along the length direction of the dilation needle 2, the tissue of the dilation needle tip 6 and the puncture site of the patient and The contact area with the blood vessel is reduced, the adhesion is reduced, and the puncture resistance at the time of insertion can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic view of a sheath dilator of the present invention.

FIG. 2 is a cross-sectional view showing an example near the tip of FIG. 1;

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a sectional view showing another example near the tip of FIG. 1;

FIG. 5 is a sectional view taken along line BB of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sheath dilator 2 Expansion needle 3 Sheath 5 Expansion needle base 6 Expansion needle tip 6T Tapered surface 6TM In the middle of a tapered surface 6TE Tapered surface end 6A Foremost 6B Last end 8 Sheath base 9 Sheath tip 9A Foremost 10 Groove 11 Projection

Claims (4)

[Utility model registration claims] 1. A dilatation needle 2 is mounted in a sheath 3 to expose a tapered surface 6T of the dilation needle tip 6 from a sheath tip 9, and a plurality of grooves 1 are formed on the tapered surface 6T in the length direction of the dilation needle 2.
0, wherein the sheath dilator 1 is formed. 2. The extension needle 2 is mounted in the sheath 3 to expose the tapered surface 6T of the extension needle tip 6 from the sheath tip 9, and a plurality of projections 11 are provided on the taper surface 6T in the length direction of the extension needle 2. A sheath dilator 1 characterized by being formed. 3. The sheath dilator 1 according to claim 1, wherein the groove 10 is formed from the middle 6TM of the tapered surface 6T to the end 6TE of the tapered surface 6T or from the middle 6TM of the tapered surface to the rearmost end 6B. 4. The projection 11 is formed at 6TM in the middle of the tapered surface 6T.
3. The sheath dilator 1 according to claim 2, wherein the sheath dilator 1 is formed from the end portion 6TE of the tapered surface 6T or the middle 6TM of the tapered surface to the rearmost end 6B.