JPH10235A - Indwelling double needle syringe with revolving screw for inserting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To readily and securely conduct insertion of an indwelling double needle which requires great skill by forming a helical structure on the surface of the jacket needle (indwelling needle). SOLUTION: (A): A helical structure 5 of grooves or projections is formed on the surface of a jacket needle (indwelling needle) 6 of an indwelling double needle and (B) the top of the jacket needle 6 (indwelling needle) is thinned, thereby the contact between the helical structure 5 and the vascular wall is strengthened and insertion of the jacket needle 6 is readily conducted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION In modern medicine, inserting a flexible indwelling needle into a blood vessel for infusion, blood collection, blood pressure measurement (invasive), etc., is an extremely daily medical practice. The present invention has been devised so that anyone can easily pierce the intravascular indwelling double needle, which has conventionally been required as skill and one of the special techniques.

[0002]

2. Description of the Related Art In the present invention, the indwelling double needle in a blood vessel refers to the whole of a metallic inner needle and a soft trocar attached to the inner needle, and the trocar (indwelling needle) is a soft indwelling part in a blood vessel and an inner needle. The term “metal needle inside the indwelling double needle in the blood vessel” serves as a support for inserting the trocar (indwelling needle).
Flexible intravascular indwelling double needles, unlike metallic injection needles,
The patient's limb movement was not required, which significantly improved the ability to secure blood vessels. However, the insertion requires experience and intuition, and has conventionally been considered as one of the special techniques requiring skill. This is because the blood vessel wall is as thin as several tens of microns, and at the clinical site, it can be inserted into a small vein that clearly has a smaller lumen than the needle, while pushing the blood vessel lumen open. This is because there are many scenes that must be done. In such a case, insufficient insertion or excessive insertion of the 10-micron tip of the needle may easily damage the blood vessel or cause the needle to come off.

[0003]

SUMMARY OF THE INVENTION According to the present invention, when the metallic inner needle, which is the guide needle, reaches the lumen of the blood vessel, blood flows back through the inner needle bore (FIG. 3-7). Can confirm that the inner core has reached the lumen of the blood vessel. At that point, further insertion of the inner needle is stopped, and the purpose is to insert only a flexible trocar (indwelling needle) so as to slide into the blood vessel lumen. At that time, it was necessary to take measures to prevent the contralateral blood vessel wall from being damaged by the inner needle due to excessive piercing and to prevent the inner needle from being pushed back and coming off the blood vessel wall.

[0004]

Means for Solving the Problems Now, the structure will be described. (A) A spiral structure with grooves or projections is carved on the surface of a double needle (indwelling needle) (FIG. 1-5). (B) The outer needle (indwelling needle) is the inner needle cut surface (Fig. 1-2).
The hole at the tip is made a little smaller so that
3). If it is not desired to reduce the flow rate, a small side hole (FIG. 1-4) may be provided.

[0005]

In order to solve the above-mentioned problems, it has been considered that a helical structure (a groove or a spiral projection) is provided on the surface of the outer needle while minimizing the insertion of the inner needle. This eliminates the need for excessive penetration to cause damage to the contralateral vessel wall. 2. The trocar (indwelling needle) because the cut surface of the inner needle faces the blood vessel lumen direction and the side surface of the inner needle comes into linear contact with the blood vessel wall by rotating the double needle half a turn together (FIG. 4). Support is strengthened. 3. When only the trocar (indwelling needle) is further rotated, only the trocar enters the blood vessel lumen due to the spiral of the surface (FIG. 5).

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The spiral structure may have grooves on the surface or may have spiral projections. As for the direction of the helix, it is usually good to turn clockwise with the image of a screwdriver, but it may be counterclockwise. Also, unlike the conventional double needle, when the tip hole of the trocar (indwelling needle) is made slightly smaller, the action (contact) of the spiral and the blood vessel wall is accelerated (FIG. 3), and the trocar (indwelling needle) is inserted into the blood vessel. It is expected that insertion will be easier. The decrease in flow rate due to the small tip hole can be handled by the small side hole (FIGS. 1-4). In addition, while turning the proximal end of the inner needle, the trocar (indwelling needle)
Since it is more convenient to rotate, it is preferable that there is a one-way engagement mechanism (lock mechanism) between both hands.

[0007]

As described above, the risk of damage to the contralateral blood vessel wall with the inner needle is reduced, and only the trocar (indwelling needle) can be safely and easily inserted into the blood vessel lumen without damaging the blood vessel. Can be expected. That is, it is considered that the insertion of the indwelling needle, which has conventionally required skill, can be performed safely and easily, including for beginners.

[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 needle tip.

FIG. 3 shows the time when it is confirmed that the needle lumen at the distal end of the inner needle has communicated with the blood vessel lumen due to backflow of blood into the inner needle (7) at the time of blood vessel insertion.

[FIG. 4] When the inner needle and the outer trocar (indwelling needle) are turned halfway together on the spot, the side surface of the inner needle comes into linear contact with the blood vessel wall and serves as a support for guiding the trocar (indwelling needle). Be strong.

FIG. 5 Further, by turning the trocar (indwelling needle), only the trocar (indwelling needle) is safely inserted into the blood vessel lumen by a reaction with the blood vessel wall.

[Explanation of symbols]

 1 is an inner needle 2 is an inner needle cut portion 3 is an outer trocar covering portion 4 is a side hole 5 is a helical structure 6 is an trocar (indwelling needle) 7 is a backflow of blood from the trailing edge of the inner needle lumen 8 is a blood vessel wall 9 Is the vessel lumen

Claims (2)

[Claims] 1. A trocar (an indwelling needle) by attaching a spiral to the tip of an indwelling portion of an intravascular double injection needle (hereinafter abbreviated as an "outer needle (indwelling needle)") and rotating it at the time of insertion. Needle with a structure that can be easily guided into blood vessels, in other words, a needle with a screw-in type trocar (indwelling needle) 2. The trocar (indwelling needle) is more advanced into the blood vessel by partially overlapping the tip of the trocar (indwelling needle) near the distal end cut surface (FIG. 1-2) of the inner needle. It is easy to contact the blood vessel wall.