JPH0356065B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (1) Field of Industrial Application The present invention relates to a catheter device that punctures into a blood vessel of a human body or the like.

(2) Conventional technology Conventionally, when inserting a catheter into a vein in the body for various tests or treatments, the syringe is removed from the injection needle inserted into the vein, and the catheter is inserted from the rear end of the injection needle. The catheter was inserted into a vein to a predetermined position, the needle was removed, and the catheter was left in the vein.

However, when the syringe is removed from the syringe needle, the syringe needle moves, and the tip of the syringe needle tends to come out of the vein, and there is also a risk that air may flow into the vein.

For this reason, for example, as shown in Japanese Patent Application Laid-Open No. 52-135593, a catheter device has a body having a small-diameter front end and a large-diameter rear end, and a side tube protrudes from the large-diameter rear end. is proposed.

(3) Problems to be Solved by the Invention However, in this catheter device, the tip of the needle is slightly protruded from the entire end of the small diameter and is inserted into the body cavity. A step is formed toward the front end of the small diameter, which makes it difficult to insert the needle into the body cavity smoothly. If the needle is inserted forcefully, the tip of the needle will pierce the vein and cause damage to the artery behind the vein. There was a risk of damage to other organs.

The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to provide an inner needle and an outer needle that is fitted into the inner needle and has a branch tube for catheter insertion protruding from the peripheral side. In addition, a branch tube for guide wire insertion is formed protruding from the fitting part of the inner needle, which communicates with the hollow interior of the inner needle, so that the guide wire can be inserted with the inner needle punctured into the blood vessel. The guide wire is inserted into the vein through the branch tube for catheter insertion, the inner needle is once removed to the rear of the branch tube for catheter insertion, and the outer needle is introduced into the body cavity while being guided by this guide wire. It is an object of the present invention to provide an improved catheter insertion device that allows an outer needle to be inserted smoothly and effortlessly without damaging arteries or other organs behind a vein.

Structure of the Invention (1) Means for Solving the Problems In order to achieve the above object, the present invention has an end that penetrates into the blood vessel, and a fitting that fits into the syringe 8 on the other end. Hollow inner needle 1 with part 2
An outer needle 7 is fitted into the inner needle 1 and has a catheter insertion branch tube 3b protruding from the circumferential side.
The catheter insertion device 5d includes a guide wire insertion branch tube 3a projecting from the fitting portion 2 of the inner needle 1 and communicating with the hollow interior of the inner needle 1.

Further, the outer needle 7 is divided into a part 6b from which the catheter insertion branch tube 3b protrudes and a side for insertion into the inside of the body, and is connected by a joint. The tube 3a may be divided into a protruding side 6a and a side inserted into the inside of the body and connected by a joint.

(2) Effect The catheter insertion device according to the present invention includes an inner needle and an outer needle that is fitted into the inner needle and has a branch tube for catheter insertion protruding from the circumferential side, and the inner needle A branch tube for inserting a guide wire is formed protrudingly on the fitting side of the inner needle, which communicates with the hollow interior of the inner needle. Insert the wire into the vein, remove the inner needle to the rear of the catheter insertion branch tube, introduce the outer needle into the blood vessel while being guided by the guide wire, then insert the catheter and remove the inner needle to the rear of the catheter insertion branch tube. By removing the outer needle, the contrast medium, drug, etc. can be continuously injected into the blood vessel from the catheter. Therefore, following the initial puncture of the inner needle into the blood vessel, the outer needle can be inserted into the vein continuously, stably and smoothly.

(3) Embodiments Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

6 and 7 show an embodiment of the catheter insertion device according to the present invention. In the figures, the catheter insertion device 5d includes an inner needle 1 made of a thin hollow cylinder made of metal, such as a hypodermic needle, and the like. , this inner needle 1
The inner needle 7 has a hollow interior that can be received in a close and sliding manner, and is provided with an outer needle 7 that is fitted into the inner needle 1. This outer needle 7 has one end that is punctured and inserted into a blood vessel as will be described later, and has a sharply formed end (on the left side above the head). The outer needle 7 also has a catheter insertion branch tube 3b that projects from its circumference in a direction opposite to the direction of insertion into the blood vessel. It communicates with the inside of this catheter insertion branch tube 3b.

On the other hand, the inner needle 1 has a sharp end that is inserted into the inside of the body, and the other end is provided with a fitting part 2 made of, for example, synthetic resin, into which the tip of the syringe 8 is fitted. There is.

A characteristic feature of the present invention is that the inner needle 1
A branch tube 3a for guide wire insertion, which communicates with the hollow interior of the inner needle 1, is formed protrudingly on the fitting portion 2 side of the inner needle 1. As a result of this, as described below,
After puncturing the sharp end of the inner needle 1 into the blood vessel, the guide wire 11 is inserted through the guide wire insertion branch tube 3a and delivered, for example, into a vein.Then, the inner needle 1 is removed and the guide wire 11 is inserted into the blood vessel. The outer needle 7 is inserted into the blood vessel along the guide wire that has been punctured.

In addition, 4 in the figure is an air sealing material fitted to the upper end of each branch pipe 3a, 3b, and a hole for catheter or guide wire insertion is provided at a concentric position of each branch pipe.

FIG. 8 shows a second catheter device according to the present invention.
An example is shown. In the catheter insertion device 5e of this embodiment, the outer needle 7 is divided into a portion where the catheter insertion branch tube 3b protrudes and a side for insertion into the blood vessel and are connected by a joint, and the inner needle 1 is connected to the guide. The wire insertion branch pipe 3a is divided into a protruding side and a blood vessel insertion side, which are connected by a joint.

That is, the outer needle 7 is divided into a main body part inserted into the blood vessel side and a part 6b having a branch tube 3b for catheter insertion protruding from the circumferential side, which are connected by a joint. The inner needle 1 inserted into the hollow in a tight sliding manner is divided into a main body side which is inserted into the blood vessel side and a protruding side 6a of the guide wire insertion branch tube 3a formed on the fitting part 2 side. The fittings have been connected. Thereby, the catheter device can be disassembled from each joint connection portion, and the interior can be easily cleaned.

Next, the operation of the catheter insertion device 5d according to the first embodiment of the present invention will be explained based on FIGS. 6 and 7. A branch tube 3a is provided protrudingly provided, and the catheter 10 is further inserted from the outer needle 7.
It is a compound needle with a protruding branch pipe 3b for insertion of the needle, and a syringe 8 is fitted into the fitting part 2 of the inner needle 1.
In this state, the tip of the inner needle 1 is inserted into the vein 9 from the sharp point. Next, the guide wire 11 is inserted through the branch tube 3a of the inner needle 1 and sent out into the vein 9. Thereafter, only the inner needle 1 is pulled out to the upper end of the outer needle 7, and the outer needle 7 is easily inserted into the vein 9 using the guide wire 11 inserted into the vein 9 as a guide. At this time, the inner needle 1 is first punctured into the blood vessel to form a minute introduction hole in the blood vessel wall, and the outer needle 7 is inserted smoothly along the guide wire, which is partially inserted into this introduction hole. can be inserted into a blood vessel from its tip. Therefore, since it is not necessary to forcefully insert the outer needle 7 into the blood vessel, damage to the vein, the artery behind it, other organs, etc. can be prevented. Thereafter, the guide wire 11 is inserted into the vein 9 and the outer needle 7.
The catheter 10 is inserted from the branch pipe 3b of the outer needle 7 which is completely inserted into the vein 9, and then the catheter 10 is inserted into the vein 9 and delivered as shown in FIG. 7 to vein 9
It is pulled out from within.

As for the catheter insertion device 5e in the second embodiment shown in FIG. The tube 6b is attached and the outer needle 7 is inserted into the inner needle 1 to perform the same use as in the first embodiment.

In both of the above embodiments, the outer needle 7 has one end that is punctured and inserted into the blood vessel formed into a sharp point, but the tip opening is formed in a direction substantially perpendicular to the longitudinal direction of the outer needle 7 It may also be provided with a cut formed in the shape of a hole, and the same effect as described above can also be obtained by this.

Note that FIGS. 1 to 5 show reference examples showing various aspects when a branch tube for catheter insertion is formed in the outer needle.
In Figure 2, a syringe fitting part 2 made of metal or synthetic resin is connected to the rear end of the inner needle 1, and a branch tube 3 for catheter insertion is directed rearward and obliquely upward from the fitting part 2. A catheter insertion device 5a is formed so as to protrude from the branch pipe 3, and an air sealing material 4 having a catheter insertion hole is fitted into the upper end of the branch pipe 3.

The catheter insertion device 5a has a branch pipe 3 protruding from the fitting part 2, and as shown in FIG. In this state, the catheter 10 is inserted through the hole in the air sealing material 4 at the upper end of the branch tube 3 and delivered from the tip of the inner needle 1 to a predetermined position within the vein 9.The catheter 10 is inserted through the branch tube 3. Therefore, it is not necessary to pull out the syringe 8 from the fitting part 2, and since the inner needle 1 can be held in a stable state, the inflow of air into the vein 9 can also be prevented. After inserting the catheter 10, the inner needle 1 is removed from the vein 9, only the catheter 10 is left in the vein 9, and a contrast agent, drug, etc. is injected.

In addition, in FIG. 3, the fitting part 2 at the rear end of the inner needle 1
For catheter insertion, a branch tube 3 for catheter insertion made of metal or synthetic resin is provided protruding rearward and obliquely upward, a joint tube 6 is fitted therein, and an air sealing material 4 is fitted to the upper end of the branch tube 3. A device 5b is formed.

In this case, a joint tube 6 with a branch tube 3 is detachably fitted onto a normal inner needle 1, and the same effect as the catheter insertion device 5a is achieved.

Furthermore, in FIGS. 4 and 5, there is a fitting part 2 at the rear end.
An outer needle 7 made of synthetic resin and having a branch tube 3 for catheter insertion protruding rearward and upward at a position near the rear end is fitted into the inner needle 1 provided with an air seal material 4 at the upper end of the branch tube 3. A catheter insertion device 5c is formed by fitting the two.

This catheter insertion device 5c is a composite needle in which an outer needle 7 made of synthetic resin is inserted into an inner needle 1, and a branch tube 3 is provided protruding from the outer needle 7.
After attaching the syringe 8 to the fitting part 2 of the inner needle 1, the inner needle 1 is inserted into the vein 9, and the outer needle 7 is inserted into the vein 9 using the inner needle 1 as a guide. As shown in the figure, the tip of the inner needle 1 is pulled out to the upper end of the outer needle 7, and the catheter 10 is inserted through the branch tube 3 while holding the outer needle 7 in a stable state.
The catheter 10 is delivered to a predetermined position within the vein 9, and then the outer needle 7 is pulled out from within the vein 9, and the catheter 10 is left in the vein 9.

As explained above, according to the catheter insertion device according to the present invention, the inner needle and the catheter inserted into the inner needle,
An outer needle having a branch tube for catheter insertion protruding from the circumferential side, and a branch tube for guide wire insertion communicating with the hollow interior of the inner needle protrudes from the fitting part side of the inner needle. With the inner needle punctured into the blood vessel, the guide wire is inserted into the vein through the branch tube for guide wire insertion, and once the inner needle is removed to the rear of the branch tube for catheter insertion, the guide wire is inserted into the vein. Since the outer needle can be introduced into the blood vessel while being guided, the outer needle can be inserted smoothly into the blood vessel without any force and will not damage the artery or other organs behind the vein.

In addition, the outer needle is divided into a part on which the branch tube for catheter insertion protrudes and a side for insertion into the inside of the body, and is connected by a joint, and the inner needle is connected to the protrusion side of the branch tube for guide wire insertion. By forming the device by dividing it into a side for insertion into the inside of the body and connecting them with joints, it becomes easy to disassemble from each connection part and clean the inside.

[Brief explanation of drawings]

FIG. 1 is a side view of a reference example showing one aspect of the catheter insertion device, FIG. 2 is a side view of its usage state, and FIG. 3 is a side view of a catheter insertion device according to another reference example. , FIG. 4 is a side view of a catheter insertion device according to another reference embodiment, FIG. 5 is a side view of the catheter insertion device in use, and FIG. 6 is a side view of the catheter insertion device according to the first embodiment of the present invention. FIG. 7 is a side view of the catheter insertion device according to a second embodiment of the present invention. FIG. 7 is a side view of the device in use. 1... Inner needle, 3a... Branch tube for guide wire insertion, 3b... Branch tube for catheter insertion, 5
d, 5e...catheter insertion device, 7...outer needle, 8...syringe, 10...catheter, 11...
...guide wire.

Claims (1)

[Claims] 1. A hollow inner needle having an end to be inserted into a blood vessel and a fitting part to fit into a syringe at the other end; an outer needle having a branch tube for catheter insertion protruding from the side, and a branch tube for guide wire insertion communicating with the hollow interior of the inner needle protruding from the fitting part side of the inner needle. A catheter insertion device consisting of: 2. The outer needle is divided into a part on which the branch tube for catheter insertion protrudes and a side for insertion into the inside of the body and is connected by a joint, and the inner needle is connected to the protrusion side of the branch tube for guide wire insertion. The catheter insertion device according to claim 1, which is divided into a side for insertion into the inside of the body and a side for insertion into the inside of the body, which are connected by a joint.