JP2995651B2 - Double injection needle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a double injection needle.
In particular, the inner needle and the outer trocar supporting the inner needle
Related to a double injection needle provided.

[0002]

The Background of the Invention double needle, to finger totality of the inner needle metallic and soft trocar attached thereto. This
Chi, a trocar, refers to soft intravascular indwelling section, whereas the inner needle is inside the metal needle trocar, plays a role of a support when inserting the trocar. In modern medicine
Is used for infusion, blood collection, blood pressure measurement (invasive), etc.
It is extremely routine for a flexible trocar to be inserted into the vessel
It is a medical treatment. The metallic inner needle that is the guide needle
When the blood reaches the lumen, blood flows back through the inner needle bore.
(Reference numeral 7 in FIG. 3), the technician indicates that the inner needle has reached the blood vessel lumen.
You can confirm that. Further insertion of the inner needle at that point
Stop and slide only the flexible trocar into the vessel lumen
Insert A flexible trocar , unlike a metallic injection needle, does not require the patient to have limited limb movement , thus significantly improving the ability to secure blood vessels.

[0003]

However, the sting
Entering requires experience and intuition, one of the special skills that require skill
It has been conventionally thought. Because the vascular wall is dozens of miku
Mils, and in clinical practice
Even small veins with smaller lumens than needles
There are a number of situations where you have to insert while pushing the lumen open
Because there are many. In such a case, 10 micro needles
Insufficient or excessive puncture of Ron easily damaged blood vessels
The needle may come off. There
In, without damaging the inner needle pairs too puncture side vessel wall,
In addition, a device was required to prevent the inner needle from coming off the blood vessel wall by being pushed back. The present invention relates to such a conventional example.
In particular, the contralateral vascular wall due to the inner needle
The trocar reduces the risk of injury and does not damage blood vessels
Can be safely and easily inserted into the vessel lumen,
Trocar insertion that required
It is intended to provide a dual injection needle that can be easily made .

[0004]

The present invention requires conventional skill.
Insertion of a double injection needle, which has been considered one of the special technologies
It is something that anyone can do easily. This eye
In order to achieve the target, in the invention according to claim 1, the inner needle,
And a trocar with the inner needle as a support.
A helical groove or projection at the tip of the surface of the trocar
Is formed. Claim 2
In the described invention, the outer trocar is provided on the tip cut surface of the inner needle.
The tip hole is made small so that it covers partly.
ing. This will try to achieve the above objectives
Things.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG.
A description will be given based on FIGS. In FIG. 1, the trocar 6
A helical projection 5 is formed at the tip of the surface of. Ma
In addition, the outer trocar 6 slightly covers the distal end cut surface 2 of the inner needle 1.
Make the hole at the tip a little smaller. 3 is the trocar
It is a clothing part. Where you do not want to reduce the flow rate
In this case, a small side hole 4 may be provided. Figure 2 is seen from the needle tip
FIG. For infusion, blood collection and blood pressure measurement (invasive)
Then, a flexible trocar 6 is inserted into the blood vessel. At this time,
First, as shown in FIG.
The tube lumen 9 is reached. When the blood vessel lumen 9 is reached, the inner needle
Since blood flows backward through the inner hole (reference numeral 7 in FIG. 3),
The technician can confirm that the inner needle 1 has reached the blood vessel lumen 9.
You. Next, the inner needle 1 and the outer trocar 6 are rotated half a turn together.
As shown in FIG. 4, the distal end cut surface 2 of the inner needle 1 is inside the blood vessel.
Facing the direction of the cavity 9, the side surface of the inner needle contacts the blood vessel wall 8 linearly
Therefore, the supporting force on the trocar 6 is enhanced. this
At this time, it is more convenient to turn the outer needle 6 at the same time as the inner needle 1 is turned.
Therefore, a one-way engagement mechanism (lock
Structure). At this point, the needle 1
Stop insertion and insert only the flexible trocar 6 into the vessel lumen 9
You. At this time, if only the outer trocar 6 is rotated, the spiral of the surface
The trocar 6 "only" as shown in FIG.
Slides into the blood vessel lumen 9. For this reason,
Insertion of the inner needle 1 causes damage to the contralateral vessel wall 8 to a minimum.
The need for excessive piercing has been eliminated. Also spiral
The needle 5 is pushed back by the projection 5 of the
It is possible to prevent a situation in which it deviates. In addition, the trocar 6
Make the tip hole a little smaller and cut the tip 2 of the inner needle 1 slightly.
As shown in FIG. 3, the helical projection 5
Contact between the trocar 6 and the blood vessel wall 8 and the insertion of the trocar 6 into the blood vessel
It will be easier. Also, by providing small side holes 4,
The flow rate decrease due to the small tip hole of the trocar 6
I can respond. Further, the present invention is not limited to the above embodiment.
Instead of the helical projection 5, a helical
May be formed. Also, the direction of the spiral is usually screw
In the image of turning, turning right is good, but turning left may be used.

[0007]

The present invention is constructed and functions as described above.
Therefore, according to this, when only the trocar is rotated,
The helical groove or projection on the surface allows the trocar "only"
It slides into the lumen. For this reason, the inner needle
It reduces contralateral vessel wall injury risk that, without damaging the blood vessel, only the trocar is to be inserted safely and easily vessel lumen. That is, conventionally skilled insertion of the indwelling needle has required that including beginners ing to allow safe and easy, gutter
Can provide excellent double injection needles
You.

[Brief description of the drawings]

FIG. 1 is an external view (side view) of the present invention.

FIG. 2 is a front view from the tip of the needle.

FIG. 3 shows a state at the time of confirming that the needle lumen at the tip of the inner needle has communicated with the blood vessel lumen due to backflow of blood into the inner needle during blood vessel insertion
FIG.

FIG. 4 is a view for explaining that when the inner needle and the outer trocar are rotated half a place together on the spot, the side surface of the inner needle comes into linear contact with the blood vessel wall and becomes firm as a support for guiding the outer trocar .

It will be safely inserted into the vessel lumen by the reaction of the trocar's injury vessel wall by turning the [5] trocar
FIG .

[Explanation of symbols]

 1 is the inner needle 2 is the inner needleThe tip cut surface of 3 is a trocar covering part 4 is a side hole 5Spiral projection  6 is the trocar 7 is the backflow of blood from the trailing edge of the inner needle lumen 8 is the vessel wall 9 is the vessel lumen

Claims (2)

(57) [Claims] (1)Inner needle and outer trocar using the inner needle as a support
In a double injection needle with A spiral groove or projection is formed at the tip of the surface of the trocar.
A double injection needle characterized by being formed. 2. The outer trocar is provided with a cut end surface of the inner needle.
The hole at the tip is made small so as to partially cover the
The double injection needle according to claim 1.