JP2000116781A - Joint structure of syringe and needle - Google Patents

Abstract

(57) [Abstract] [Purpose] By joining a syringe and a syringe needle using elastic deformation, it is easy to confirm that the syringe needle has been joined to the syringe, and at the same time, the syringe needle from the syringe after use. Can be easily removed with one hand operation. Furthermore, since it can be easily disposed of, it is possible to prevent a needlestick accident of a medical worker. [Structure] An easy-to-detachable engaging portion is formed between the outer periphery of the tip shaft of the syringe to which the injection needle is joined and the inner periphery of the mounting base of the injection needle, and the engaging portion is easily engaged with each other. In some cases, the outer peripheral surface of the tip shaft and the inner peripheral surface of the mounting base of the injection needle are brought into liquid-tight contact with the front of the engagement portion, so that liquid leakage can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure between a syringe and a needle.

[0002]

2. Description of the Related Art As a conventional joint structure between a syringe and an injection needle, as shown in FIG. 6, an outer periphery of a tip shaft 6a of a syringe 6 and an inner hole surface 8a of a mounting base 8 of the injection needle 7 are tapered. It is very difficult to match the two at the time of manufacture because there must be no leakage when using a syringe. Also, to separate the syringe and needle after joining and using, a twisting and turning force is required,
There is a problem that it cannot be easily separated due to variations and small dimensions to be gripped.

[0003]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned conventional problems, in which leakage of liquid is reliably prevented, and the syringe and the injection needle can be easily separated.

[0004]

The present invention has the following arrangement to achieve the above object. The joint structure of the syringe and the injection needle according to the first aspect of the present invention is easy to attach and detach by elastic deformation between the outer periphery of the tip shaft of the syringe to which the injection needle is joined and the inner periphery of the mounting base of the injection needle. The engaging portion is formed, and when the members are engaged with each other, the outer peripheral surface of the tip shaft portion and the inner peripheral surface of the mounting base of the injection needle are brought into liquid-tight contact with each other ahead of the engaging portion, Liquid leakage can be prevented

According to a second aspect of the present invention, there is provided a joint structure between a syringe and a needle according to the first aspect of the present invention. And a groove on the entire circumference is formed, and a protrusion on the entire circumference or a partial protrusion is formed on the other side.

According to a third aspect of the present invention, there is provided the joint structure of a syringe and a needle according to the first aspect of the present invention, wherein the syringe is held with one hand and the thumb of the hand is held. Alternatively, a projection to which an index finger is applied is provided on the outer periphery of the mounting base of the injection needle.

[0007]

1 to 3 show a joint structure of a syringe and a needle according to a first embodiment of the present invention. First, FIG.
As shown in FIG. 1, an engaging portion 1c formed of a full-circular protrusion is formed on the outer periphery of the tip shaft portion 1a of the syringe 1, and a tapered tip surface 1b is formed at the tip of the tip shaft portion 1a.

Next, FIG. 3 shows an injection needle 2. The injection needle 2 has a needle 3 fixed to the tip of a mounting base 4. Further, an engaging portion 4b formed of an entire circumferential projection is formed on the inner periphery of the inner hole of the mounting base 4, and an abutting surface 4a having a tapered step is formed in the inner hole in front of the engaging portion 4b. ing. A finger hook 8 is provided on the outer peripheral portion of the mounting base 4 in the form of a flange or a protruding piece at a required position.

FIG. 1 shows a state in which an injection needle 2 is joined to a tip shaft portion 1a of a syringe. A projection provided on the entire inner circumference of an inner hole of a base 4 for mounting the injection needle is shown in FIG. A projection, which is also provided on the entire periphery of the tip shaft portion 1a of the syringe, is engaged with the projection by using elastic deformation to get over the projection. In addition, the engaging force is set in a range in which attachment and detachment are easy. Further, when they are engaged with each other, the distal end surface 1b of the front shaft portion 1a comes into contact with the contact surface 4a of the mounting base portion 4 of the injection needle in a liquid-tight manner ahead of the engaged portion, so that liquid leakage is ensured. It is possible to prevent.

Usually, the mounting base 4 for the injection needle and the syringe are made of an elastically deformable synthetic resin, but at least one of them may be made of a synthetic resin in order to make it elastically deformable. Further, the mutual engaging portions may be formed with a projection on the entire circumference or a groove on the entire circumference on one side, and a projection on the entire circumference or a partial projection on the other side.

FIG. 4 and FIG. 5 are views showing a joint structure of a syringe and a needle according to a second embodiment of the present invention. The second embodiment has the same basic configuration as the first embodiment, and only the differences will be described below. As shown in the figure, a thin flange portion 5b is provided at the tip of the tip shaft portion 5a of the syringe 5, and the flange portion 5b is provided on an abutting surface 4a provided in an inner hole portion of the mounting base 4 for the injection needle. Are elastically deformed to enable close contact. That is, even if the dimensional accuracy between the members slightly varies, the close contact state is guaranteed and the liquid leakage is reliably prevented.
Note that an O-ring or the like can be provided instead of the flange portion, but there is a problem in reliability in assembly and cost.

[0012]

As described above, according to the present invention, the engaging portion provided on the outer periphery of the tip shaft portion of the syringe and the engaging portion provided on the inner periphery of the mounting base of the injection needle are engaged in an easily detachable relationship. At the same time, while holding the syringe with one hand, the thumb or the index finger of the hand is put on the finger hook 6 provided on the outer periphery of the mounting base of the syringe needle so that the syringe needle can be easily separated from the syringe.

[0013]

The construction and operation of the joint structure of the syringe and the injection needle according to the present invention are as described above. By using this joint structure, it is expected that a click sound is generated when the joint is completed. Not only can you confirm the end of joining,
It is much easier to remove the injection needle lightly from the syringe with one hand, so that after use, the injection needle alone can be discarded in a safe container, preventing medical workers from needle stick accidents. . Therefore, it is a medical device with an excellent effect of protecting healthcare workers from secondary infection, which has become a social problem.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a joint structure of a syringe and an injection needle which is Embodiment 1 of the present invention.

FIG. 2 is a view showing a tip portion of a syringe.

FIG. 3 is a diagram showing a main part of the injection needle.

FIG. 4 is a cross-sectional view showing a joint structure of a syringe and an injection needle which is Embodiment 2 of the present invention.

FIG. 5 is a view showing a tip portion of the syringe.

FIG. 6 is a view showing a conventional joint structure of a syringe and a needle.

[Description of Signs] 1 syringe 1a tip shaft 1b tip end surface 1c engaging portion 2 injection needle 3 needle 4 mounting base 4a contact surface 4b engaging portion 5 syringe 5a tip shaft 5b flange portion 5c engaging portion 6 finger hook Part 7 Syringe 7a Shaft tip 8 Injection needle 9 Mounting base 9a Inner hole surface

Claims (3)

[Claims] An easy-to-detachable engaging portion is formed between an outer periphery of a tip shaft portion of a syringe to which an injection needle is joined and an inner periphery of a mounting base of the injection needle, and an engagement portion which is easily detachable is formed. At the time of joining, the outer peripheral surface of the tip shaft portion and the inner peripheral surface of the mounting base of the injection needle are brought into liquid-tight contact with each other at the end of the engagement portion, so that the syringe and the injection needle can be prevented from leaking. Construction. 2. The mutually engaging portion has a projection on the entire circumference or a groove on the entire circumference formed on one side, and a projection or a partial projection on the entire circumference formed on the other side. Item 2. A joint structure between the syringe and the injection needle according to Item 1. 3. The syringe and the injection needle according to claim 1, wherein a projection on which the thumb or the index finger is applied is provided on the outer periphery of the mounting base of the injection needle while holding the syringe with one hand. Joint structure.