JP2979684B2 - Separate needle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cannula used as an introduction portion of a catheter, and more particularly, to introduce a catheter into a body cavity through an indwelled cannula, place the catheter in a body cavity, and then tear the cannula in a longitudinal direction to easily remove the cannula. The present invention relates to a separate needle that can be detached.

[0002]

2. Description of the Related Art A synthetic resin cannula called a so-called indwelling needle functions as an introduction portion for smoothly introducing a long catheter or the like into a body cavity. Its presence hinders subsequent procedures. For this reason, a synthetic resin cannula of a type that can be split and removed by tearing or splitting the cannula as an introduction portion in the longitudinal direction after insertion of the catheter has been developed (Japanese Utility Model Publication No. Sho 51-1661, Japanese Patent Publication No. Sho 61-59146). Publication No. 61-5046
No. 4, Japanese Patent Publication No. Hei 2-7670, etc.).

[0003] The device disclosed in Japanese Utility Model Publication No. 51-1661 is to grip the handle means and apply a force in a direction perpendicular to the longitudinal axis, and place the handle means along a separation line (a plurality of slits or perforations) which is a weakened portion. The invention disclosed in Japanese Patent Publication No. 61-59146 discloses a catheter (vertical) made of a material obtained by uniformly mixing a modified polymer having no compatibility with the base polymer. The invention disclosed in Japanese Patent Publication No. Hei 2-7670 is almost 18
This is a catheter in which two parallel strips of a denatured polymer disclosed in Japanese Patent Publication No. 61-59146 are interposed at positions shifted by 0 degrees. In addition, Japanese Patent Publication No. 61-5046
The invention of JP-A No. 4 (1999) -1995 is provided with a plurality of linear portions mixed with an inorganic powder having X-ray opacity along the axial direction of the base of the catheter.

These prior arts are disclosed, for example, in
In the invention of JP-A-16661, there is a fatal drawback that blood flowing in at the time of puncture leaks out of the parting line, and it is not only very painful but also may be broken during tearing. is there. Also, the inventions of Japanese Patent Publication No. 61-59146 and Japanese Patent Publication No. 2-7670 using modified polymers, and Japanese Patent Publication No. 61-504.
In the invention of JP-A-64, there is a dislike that the tear strength is still too large, and there is a possibility that the cannula moves when a large force is exerted by the operation of removing the cannula, causing pain to the patient.

[0005]

In order to solve these problems, the present applicant has already proposed an easily splittable cannula having a suitable tear strength without leaking blood (Japanese Patent Application In the case of a structure as shown in FIG. 3 in which a gripping means is provided at the base of the cannula, a so-called luer taper portion 61 whose inner diameter is increased in a tapered shape is provided in the inner cavity of the hub 21. In addition, the thickness of the separated portion of the hub 21 formed integrally with the tube 11 is reduced (72 in FIG. 5) or a groove (71 in FIGS. 3 and 4) is provided to facilitate the division of the hub 21. However, if the separation portion is thinned or provided with a groove, it is difficult to obtain the dimensional accuracy of the luer taper portion 61 of the hub 21 due to internal stress and residual distortion during molding, and therefore, the workability of manufacturing is poor. Product performance is unstable It had a disadvantage.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a separate needle having good manufacturing workability and stable product performance.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a separation method in which the outer diameter of the tip is tapered and the inner and outer diameters of the base are tapered. A separate needle consisting of a tube having a band and a pair of gripping means integrally welded by insert molding with a separation band at the base of the tube interposed therebetween is employed.

[0008]

According to the above construction, the tube can be easily torn from the separation band by grasping the holding means of the separate needle with both hands and opening the tube to the left and right.

[0009]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing one embodiment of the present invention (a lumen portion is indicated by a dotted line), and FIG. 2 is a front view of FIG.

The separate needle of the present invention comprises a tube 1 and a gripping means 2 as shown in FIG. The outer diameter of the distal end 4 of the tube 1 is tapered, and the outer diameter and the inner diameter of the base 5 are tapered. A separation band 3 is formed in the tube 1, and a gripping means (hereinafter referred to as a grip) welded to the base by insert molding.
By opening the left and right sides 2, the separation zone 3 can be easily separated at the boundary.

The tube 1 is disclosed in Japanese Patent Application No. 2-9485.
No. 3 is a synthetic resin tube composed of a plurality of strips extending in the longitudinal direction, and is preferably one in which adjacent strips can be easily separated from each other. In this case, a separation strip is preferable. 3 is the boundary between adjacent strips. As for the forming material of the adjacent band, the forming material of one band is a first synthetic resin selected from polypropylene, polyethylene, polyester, or the like, and the forming material of the other band is changed to the first synthetic resin. The material is a material obtained by mixing a second synthetic resin having no compatibility with the first synthetic resin, for example, polyurethane.

As the tube 1, besides, Japanese Patent Publication No.
As shown in Japanese Patent No. 50464, a plurality of linear portions mixed with an inorganic material having X-ray contrast properties, for example, barium sulfate powder are formed along the axial direction of a base made of a synthetic resin material such as polypropylene. Uniformity of a base polymer such as polypropylene and a modified polymer having no compatibility with the base polymer such as polyethylene as shown in JP-B-61-59146. A product produced by extrusion from a mixture, a product having a strip of a modified polymer interposed in the longitudinal direction of a tube composed of a base polymer (to be a separation band) as disclosed in Japanese Patent Publication No. 2-7670, etc. Can also be used.

The handle 2 is made of a material compatible with the material for forming the tube 1, for example, polypropylene, polyethylene, polyester, or the like. The shape of the handle 2 is not particularly limited, but as shown in FIGS. Base 5 of
Is generally in the shape of a letter having an adhesive surface corresponding to the outer diameter of the separator. As can be seen from FIG. 2 showing the state when viewed from the right side of FIG. Welded.

As is clear from the above description, the separate needle of the present invention has a tapered shape of the inner and outer diameters of the base end of the tube, and the base has a gripping means formed by insert molding. Since the welding is performed, even if the thickness of the formed gripping means is slightly uneven, the deformation does not occur in the taper of the tube. Therefore, an inexpensive product with stable performance can be provided.

[Brief description of the drawings]

FIG. 1 is a plan view showing one embodiment of the present invention (a lumen portion is indicated by a dotted line).

FIG. 2 is a front view of FIG.

FIG. 3 is a plan view showing a conventional example (a groove is formed in a separation portion).

FIG. 4 is a front view of FIG. 3;

FIG. 5 is a front view of another conventional example (a separation portion is thinned).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tube 2 Grasping means 3 Separator

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-292963 (JP, A) JP-A-63-252168 (JP, A) JP-A-62-161380 (JP, A) Jpn. 36734 (JP, U) JP 2-7670 (JP, B2) JP-B 61-59146 (JP, B2) JP-B 61-50464 (JP, B2) JP-B 51-1661 (JP, Y1) (58) Field surveyed (Int. Cl. ⁶ , DB name) A61M 25/08

Claims (2)

(57) [Claims] 1. A synthetic resin cannula that can be divided and removed in the longitudinal direction after introduction of a catheter, wherein the outer diameter of the distal end is tapered and the inner and outer diameters of the base are tapered. A separate needle comprising a tube having a separation band having a diameter, and a pair of holding means integrally welded by insert molding with a separation band at a base of the tube interposed therebetween. 2. The separate needle according to claim 1, wherein a plurality of linear portions into which an inorganic powder having X-ray contrast is mixed are provided along the longitudinal direction.