JPH0111253Y2 - - Google Patents

Description

[Detailed description of the invention] The invention was developed over a relatively long period of time (several hours).
This invention relates to the improvement of injection needles used when administering intravenous drips or blood transfusions.

Conventionally, injection needles used for such purposes include those shown in FIGS. 1 to 3. The injection needle shown in Fig. 1 has been in general use for a long time.The base of the needle 1 is fixed to the front end of a mounting tube 2 made of a transparent synthetic resin material, and the rear end is attached to a transparent flexible elongated tube. A synthetic resin tube 3 is inserted and fixedly connected to the needle 1, and the other end of the thin tube 3 has a connecting tube 4 and its lid 5 for connecting to a drip drip or blood transfusion container.

To use this, insert the needle 1 of the syringe needle connected to an infusion container etc. into a blood vessel in the patient's arm, etc., and then insert the needle 1 into the patient's arm, etc., and then carefully insert the needle 1 and the thin tube 3 into the patient's arm at key points so that the needle 1 does not move. etc., with an adhesive band, etc., and also secure the arm so that it does not move. However, this fixation of the injection needle to the arm is not stable enough because the shape of the fixation point is cylindrical, and furthermore, the injection needle often moves relative to the arm because it can be used for several hours. Therefore, the tip of the needle 1 pierces the blood vessel, causing leakage of instillation fluid and blood, which not only requires re-insertion of the needle each time, but also causes pain to the patient.

The conventional injection needle shown in FIG. 2 is a relatively new one that has improved the disadvantages of the injection needle shown in FIG. The improvement is that a wing 6 made of a flexible material is attached to the attachment tube 2 shown in FIG. The wings 6 have the effect of making the fixation on the arm more stable and making it easier to insert the needle. When fixing to the arm, the wing 6 is spread out (always in the spread state due to elasticity) and fixed to the arm with an adhesive band, and when inserting the needle, overlap the left and right wings of the wing 6 with your fingertips and pinch. Let's make rice cake. However, although the injection needle shown in FIG. 2 has an improved fixing method and operation than the injection needle shown in FIG. 1, accidents such as blood vessel puncture still occur during long-term use.

Furthermore, the conventional injection needle shown in Figure 3 is called an intravascular indwelling needle used for long-term (several days) intravenous drips and blood transfusions, and is different from the injection needles shown in Figures 1 and 2. It is used continuously for a much longer period of time. In FIG. 3, a shows the overall configuration, b shows the needle part, and c shows the outer cylinder part. As shown in FIG. b, the needle 1 is longer and thicker than those in FIGS. 1 and 2. 7 is needle 1
This is a metal attachment tube that holds the base of the blood vessel and attaches it by inserting a drip or blood transfusion connector into the hole 7a at the rear end. As shown in c, 8 is an outer cylinder made of a transparent and flexible synthetic resin tube, which can be slidably inserted in close contact with the outer periphery of the needle 1. A metal mounting tube 9 holds the base of the outer cylinder 8, and the outer cylinder 8 is tightened and fixed by a band 10. Hole 9a at the rear end of the mounting tube 9
As shown in FIG. 3a, it can be fitted into the front end of the attachment tube 7, and after the attachment tube 7 is removed, a drip or blood transfusion connector can be inserted and attached. When the rear end of the attachment tube 9 is completely inserted into the front end of the attachment tube 7, the front end of the outer tube 8 is in a position where the tip blade of the needle 1 is sufficiently exposed. Third
To use the injection needle shown in the figure, insert the injection needle with the outer barrel 8 attached into the blood vessel, then pull out only the needle portion with the outer barrel 8 still inserted, and then insert the needle with the outer barrel 8 attached into the blood vessel. A connecting device for drip drip or blood transfusion is inserted into the hole 9a at the end and fixed.

In the injection needle shown in FIG. 3, only the needle is removed with the outer barrel remaining after the needle is inserted, so it is possible to prevent the accident of puncturing a blood vessel during use. However, the operation of removing the needle and switching to the outer barrel increases the number of operating steps and requires careful operation, skill, and time. It is not recommended to use it for blood transfusions. Furthermore, this injection needle is considerably more expensive than the injection needles shown in FIGS. 1 and 2, making it uneconomical to often use it as a disposable consumable item.

As mentioned above, the injection needles shown in Figures 1 and 2 have the advantage of having a simple structure, being easy to operate, and being economical as disposable consumables. It has the disadvantage of causing leakage accidents. In addition, the injection needle shown in Figure 3 has the advantage of being able to prevent blood vessel puncture accidents, but has the disadvantage that it requires skill and time to switch from the needle part to the outer barrel, and is expensive. .

The object of the present invention is to eliminate the above-mentioned drawbacks of the prior art, and to provide an economical injection needle that does not cause blood vessel puncture by the injection needle, is easy to operate, and has a simple structure.

The main point of the present invention is to utilize the advantages of the conventional examples shown in FIGS. 1 and 2, such as simple structure and easy operation, and the conventional example shown in FIG. This device is designed to eliminate the switching operation from the needle to the outer cylinder, which is a drawback of the conventional example. That is, the outer cylinder of the injection needle shown in Fig. 3 is provided in the needle portion of the injection needle shown in Fig. 1 or 2, and the tip of the outer cylinder is made to sufficiently expose the tip blade portion of the needle before the needle is inserted. After positioning the outer tube, and after inserting the needle, keep both the needle and outer tube indwelled in the blood vessel and move only the outer tube forward so that the tip of the needle is hidden inside the outer tube. Position. As a means for moving the outer cylinder to the above two positions and positioning and locking it, for example, a threaded part is provided on the mounting tube that holds the base of the needle, and the outer cylinder is screwed into this threaded part and the outer cylinder is rotated. A threaded portion that moves forward or backward in the direction of the needle axis is provided, and means for locking the rotation of the outer tube at the above two positions on the mounting tube and the outer tube, for example, a fitting engagement at the rotating contact portion of both at the above two positions. Provide recesses and protrusions for stopping.

Hereinafter, the present invention will be explained in detail with reference to embodiments illustrated in the drawings. FIG. 4 shows the overall configuration of the present invention, and FIG. 5 shows an explanatory view of the main parts of each part. In the figure, 1, 3 to 6 indicate the same parts as in FIG.
Reference numeral 11 denotes a mounting pipe corresponding to the mounting pipe 2 in FIG. 2, and a threaded portion 11a is provided on the outer periphery of its front end as shown in FIG. 5a.
A forward position mark 11c is provided on the outer periphery at the rear end, and a backward positioning projection 11b is provided on the outer periphery in the middle. Reference numeral 12 denotes an outer cylinder that is slidably inserted in close contact with the entire length of the outer circumference of the needle 1, and a mounting tube 11 is attached to the rear end thereof as shown in FIG. 5b.
There is a threaded part 12a that is screwed into the threaded part 11a of the
Further, there is a finger hook 12b for rotation at one location around this rear end. By turning this finger hook 12b with a fingertip, the outer cylinder 12 moves forward or backward in the axial direction while rotating on the needle 1. The outer cylinder 12 is rotated in the forward direction, and when the rear end 12c of the outer cylinder 12 reaches the forward position mark 11c of the attachment tube 11, the rotation is stopped and the outer cylinder 12 is placed in the forward position. Further, the outer cylinder 12 is rotated in the backward direction so that the rear end 12c of the outer cylinder 12 is attached to the mounting pipe 1.
When the rotation is stopped by the retreating positioning projection 11b of No. 1, the outer cylinder 12 is in the retreating position. In this forward position, the outer cylinder 12 sufficiently hides the leading edge of the needle 1, and in the retracted position, the outer cylinder 12 fully exposes the leading edge of the needle 1.

To use the injection needle according to the present invention as shown in FIG. 4, when inserting the injection needle, turn the finger hook 12b to
Retract the outer cylinder to the locking position where the leading edge of the needle 1 is fully exposed from the outer cylinder 12. After inserting the injection needle, turn the finger hook 12b in the opposite direction until the leading edge of the needle 1 is fully exposed inside the outer cylinder 12. Move it forward to the hidden locking position. The tip of the needle 1 is hidden in the outer tube 12, which is made of a flexible and elastic synthetic resin tube, so when an infusion or blood transfusion is being performed in this state, the tip of the outer tube 12 is hidden by the movement of the injection needle. Even if the part touches the blood vessel wall, there is no risk of it breaking through. This invention is the third
It is possible to perform safe infusion operations using the outer barrel without having to pull out the injection needle and switch to the outer barrel as in the conventional example shown in the figure.

In the above embodiment, the structure is such that the axial movement of the outer cylinder 12 due to the rotation of the outer cylinder 12 is performed by the screw rotation of the screws provided on the outer cylinder 12 and the mounting pipe 11, but the same principle can be used. As a simpler structure, a helical groove may be provided on one of the contact circumferential surfaces, and a slidable protrusion may be provided on the other contact circumferential surface by fitting into the helical groove.

Furthermore, as another example of this part, as shown in FIG. It may be a structure. This waveform surface may be a curved surface (for example, a sine wave surface) or a triangular wave surface, but a curved surface allows smooth rotation in the circumferential direction. In FIG. 6a, the outer cylinder 12 is rotated so that the top of the peak on the circumferential end surface 12e matches the bottom point of the valley on the circumferential end surface 11e of the mounting tube 11, and the outer cylinder 12 is turned.
Fig. 6b shows the state in which the outer cylinder 12 is further rotated to its retracted position.
A state in which the top of the peak e is aligned with the top of the peak 11e and the outer cylinder 12 is positioned at its forward position is shown. c in Fig. 6 shows the outer cylinder 12 and the mounting pipe 11.
FIG. 3 is a developed view showing circumferential end surfaces 12e and 11e of the FIG. The convex portion 11b and the concave portions 12c and 12d are for locking the rotation of the outer cylinder 12, which has the same function as that shown in FIG. 12b is a rotation finger rest. By changing the height H of the corrugated surface, the amount of displacement of the back and forth movement of the outer cylinder 12 can be set arbitrarily.

As described above, according to the present invention, it is easy to operate, can be safely used for long-term infusions or blood transfusions, and has a simple structure and is economical even when used as a disposable consumable. be.

In the above embodiment, the attachment tube 11 is provided with wings 6, but this is not essential for the configuration of the present invention.

[Brief explanation of the drawing]

Figures 1, 2 and 3 each show a conventional injection needle, Figure 4 is an overall configuration diagram of an embodiment of the present invention, Figure 5 is an explanatory diagram of the main parts of each part, and Figure 6 FIG. 2 is an explanatory diagram of main parts of another embodiment. DESCRIPTION OF SYMBOLS 1... Needle, 3... Thin tube for connection, 11... Mounting tube, 11a... Screw of mounting tube 11, 11b... Protrusion for backward positioning, 11c... Advance position mark,
12...Outer cylinder, 12a...Threaded portion of outer cylinder 12, 1
2b...Finger hook for the outer cylinder 12.

Claims (1)

[Scope of utility model registration request] a needle for injection; a transparent, flexible, elongated thin tube whose one end is connected to a container for intravenous fluids or blood transfusion; a cylindrical attachment tube that connects the needle and the thin tube; a transparent and flexible elongated cylindrical outer tube that can be inserted into the attachment tube in close contact with the entire length of the outer periphery of the needle; At the contact point, there is a structure that allows the outer cylinder to move back and forth in the axial direction with respect to the attachment tube by rotating the outer cylinder around its axis, and a structure that allows the outer cylinder to move back and forth in the axial direction by rotating the outer cylinder around the axis. An injection needle equipped with a structure that locks at a position where the cutting edge is sufficiently relaxed and at a position where the cutting edge is sufficiently exposed.