JPH0586237B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a hypodermic needle assembly. More specifically, it is an improved injection in which the fit between the protector and the injection needle is made with appropriate strength, and the protector does not fall off from the injection needle during post-processes such as packaging and sterilization, storage, and transportation. Relating to needle assemblies.

<Conventional technology> A protector has traditionally been used to protect the cutting edge of a hypodermic needle, and the needle is inserted into the protector from the edge side, and the hub of the needle is fitted into the protector. .

In order to ensure that appropriate fitting strength is obtained without variation from product to product, a plurality of protrusions are formed on the hub in the longitudinal direction of the hub, and these protrusions are attached to the inner wall of the protector. It is becoming more and more engaged.

<Problems to be Solved by the Invention> However, the fitting between the injection needle and the protector with the above structure may be too strong or too weak, and if the fitting is too weak, it is necessary to cover the injection needle with the protector. The protector sometimes falls off from the needle during packaging, sterilization, storage, transportation, etc., resulting in contamination of the needle or damage to the needle tip, which is a problem.

The present invention was made in view of the above problems,
To provide an injection needle assembly in which a protector and an injection needle can be fitted with an appropriate force and the protector does not easily fall off from the injection needle.

<Means for Solving the Problems> In order to solve the above problems, the present invention provides an injection needle in which a cannula is inserted into a hub having a plurality of longitudinal protrusions that engage with the inner wall of a protector; In an assembly with a protector that is crowned on the injection needle and protects the cannula, the protrusion of the hub has a protector engaging part that engages with the protector, and the protector engaging part is attached to the longitudinal side of the injection needle. Both ends are at approximately the same height with respect to the axis, the lowest portion is located at an intermediate position, and the ridgeline at least on the distal end side of the protector engaging portion is formed to gently slope toward the lowest portion. The protector includes a hub engaging portion that engages with the hub, and a hub bumper that collides with the front end surface of the protector engaging portion at the front end of the hub engaging portion to restrict entry of the injection needle into the protector. The hub engaging portion has an inner diameter that is equal to or slightly larger than the outer diameter of the hub in the protector engaging portion, and an annular projection is provided on the inner wall of the hub engaging portion. The inner diameter of the protector at the protruding portion is formed to be slightly smaller than the outer diameter of the hub at the lowest portion of the protector engaging portion, and when the injection needle is inserted into the protector, the annular protrusion of the protector The structure is such that it fits in the lowest part of the engaging part.

<Function> Since the injection needle assembly of the present invention is constructed as described above, when the injection needle and the protector are fitted, the annular projection of the protector is connected to the projection of the hub at the most recessed part. engage. Therefore, the annular projection of the protector is difficult to move in the longitudinal direction of the injection needle, so even if the fit between the injection needle and the protector is weak, the protector will not fall off from the injection needle unless you try to forcefully remove the protector by hand. There is no.

<Example> Next, an example of the present invention will be described based on the drawings.

FIG. 1 is a plan view showing the protector and injection needle that constitute the injection needle assembly of the present invention, and FIG. 2 is an explanatory view showing the state before the protector and injection needle shown in FIG. 1 are fitted together. FIG. 3 is an explanatory diagram showing a state in which the protector and the injection needle are fitted together.

As shown in FIG. 1, the injection needle assembly of the present invention includes:
It is an assembly consisting of a hypodermic needle 1 in which a cannula 4 is inserted and adhesively fixed into a hub 3 having a plurality of longitudinal protrusions 5, and a protector 2 that is placed over the hypodermic needle 1 to protect the cannula 4. It is characterized by the shape of the inner wall of the protector 2 and the protrusion 5 portion of the hub 3 of the injection needle 1 that engages with this inner wall.

That is, the protrusion 5 of the hub 3 has a protector engaging portion 7 that engages with the protector 2, as shown in FIGS. 1 to 3.
has substantially the same height at both ends with respect to the longitudinal axis of the injection needle 1, and has the lowest portion 6 in the middle thereof, and at least the ridgeline on the distal end side of the protector engaging portion 7 is at the lowest portion 6. The protector 2 is formed to be gently inclined toward the
As shown in FIGS. 2 and 3, the hub engaging portion 8 engages with the hub 3, and the front end of the hub engaging portion 8 collides with the front end surface 12 of the protector engaging portion 7, causing the injection needle to collide with the front end surface 12 of the protector engaging portion 7. 1 has a hub abutting surface 9 that restricts entry of the hub 3 into the protector 2, and the hub engaging portion 8 has an outer diameter equal to or slightly larger than the outer diameter of the hub 3 in the protector engaging portion 7. The inner diameter of the protector 2 is slightly smaller than the outer diameter of the hub 3 at the lowest part 6 of the protector engaging part 7. It is formed so that when the injection needle 1 is inserted into the protector 2, the annular protrusion 10 of the protector 2 fits into the lowest portion 6 of the protector engaging portion 7.

Hereinafter, the main parts of the present invention will be explained in more detail using FIGS. 2 and 3.

The protector engaging portion 7 is a portion that engages with the inner wall of the protector 2, more precisely, the hub engaging portion 8.
Preferably, the ridge line 11 on the proximal side is formed to slope at a relatively large slope to reach the lowest portion 6, and after the lowest portion 6 continues for a certain length, the ridge line 11 on the proximal side slopes at a gentle slope to reach the lowest portion 6. It is formed to reach the area. This is because if the slope on the tip side is too steep, it will be difficult for the hub 3 to come out of the mold during molding, which will easily cause variations in dimensions.Also, it will not require a large amount of force to attach and detach the protector 2 from the injection needle 1. Moreover, during post-processes such as packaging and sterilization, as well as during storage and transportation, the needle 1 to the protector 2
It is also a device to prevent it from falling off easily.

The outer diameter of the protector engaging portion 7 is preferably such that the outer diameter of the proximal end is slightly larger than the outer diameter of the distal end. This is a device that is easy to use and reduces as much as possible the looseness of the rod between the injection needle 1 and the protector 2 during the manufacturing process, that is, the poor fit of the injection needle 1 into the protector 2. This is because if the play is large, the protector may move during the process of attaching the protector to the fixed injection needle, and the inner wall of the protector may come into contact with the cutting edge of the injection needle, damaging the cutting edge.

It should be noted that it is better to reduce the diameter at a relatively large slope on the proximal end side of the protector engaging portion 7 and form the lowest portion 6 to a predetermined length, or to reduce the diameter from the proximal end side with a gentle taper to the lowest portion 6. Dimensional stability is better than when it is formed all the way, and there is less play.

On the other hand, the hub engaging portion 8 of the protector 2 is connected to the injection needle 1.
The hub 3, more precisely, is the part that engages with the protector engaging part 7, and when the protector 2 is attached to the injection needle 1, it is located at the position corresponding to the lowest part 6 of the protector engaging part 7 (in practice). When the lowest portion is formed to have a predetermined length as in the example, an annular protrusion 10 is formed at a position corresponding to the distal end thereof. This annular projection 10 is a portion that engages with the lowest portion 6 of the protector engaging portion 7 at its top, and the height of the projection 10 is preferably 0.05 to 0.15 mm. The hub engaging portion 8 is preferably formed with a flat raised portion 13 that is continuous with the annular projection 10 and raised toward the proximal end of the hub 3.
Also, the injection needle 1 and protector 2 in the manufacturing process
This is a device to prevent play between the two.

Next, the fitting between the injection needle 1 and the protector 2 will be explained.

As the injection needle 1 is inserted into the protector 2 as shown in FIG. It hits me. When the injection needle 1 is further pushed forward, as shown in FIG. enter in. At this time, the apex of the annular projection 10 of the protector 2 engages with the lowest portion 6 of the protector engaging portion 7 of the hub 3.

<Effects of the Invention> As is clear from the above explanation, the injection needle assembly of the present invention can be used in post-processes such as packaging and sterilization after a protector is attached to the injection needle, and during storage and transportation. Since the protector does not fall off the injection needle, problems such as contamination of the injection needle and damage to the needle tip are eliminated. Therefore, if the injection needle assembly of the present invention is employed, it is hygienic and also economically advantageous.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the present invention,
FIGS. 2 and 3 are explanatory diagrams showing the states of the protector shown in FIG. 1 and the injection needle before and after they are fitted, respectively. Explanation of the main symbols: 1...syringe needle, 2...protector, 3...hub, 4...cannula, 5...projection,
6...lowest part, 7...protector engaging part,
8... Hub engaging portion, 9... Hub abutting surface, 10...
Annular process.

Claims (1)

[Claims] 1. An injection needle in which a cannula is inserted into a hub having a plurality of longitudinal protrusions that engage with the inner wall of the protector, and a protector that is attached to the injection needle to protect the cannula. In the assembly, the protrusion of the hub has a protector-engaging portion that engages with the protector, and the protector-engaging portion has both ends approximately at the same height with respect to the longitudinal axis of the injection needle, and an intermediate portion thereof. The protector has a lowest part at the bottom, and at least a ridgeline on the distal end side of the protector engaging part is formed to gently slope toward the lowest part, and the protector has a hub engaging part that engages with the hub. and a hub abutting surface that collides with the front end surface of the protector engaging part at the front end of the hub engaging part to restrict entry of the injection needle into the protector, the hub engaging part has an inner diameter that is equal to or slightly larger than the outer diameter of the hub in the protector engaging portion, and an annular projection is provided on the inner wall of the hub engaging portion so that the inner diameter of the protector at the projecting portion is equal to or slightly larger than the outer diameter of the hub in the protector engaging portion. It is formed to be slightly smaller than the outer diameter of the hub at its lowest point, and is formed so that the annular protrusion of the protector fits into the lowest point of the protector engagement part when a syringe needle is inserted into the protector. A syringe needle assembly featuring: 2 The ridgeline on the base end side of the protector engaging portion slopes at a relatively large slope and reaches the lowest part,
The injection needle assembly according to claim 1, wherein said lowest portion is maintained at a predetermined length. 3 The height of the annular protrusion of the protector is 0.05 to 0.15 mm.
The injection needle assembly according to claim 1 or 2. 4. The injection needle assembly according to claim 1, wherein the outer diameter of the proximal end of the protector engaging portion is slightly larger than the outer diameter of the distal end. 5. The injection needle assembly according to any one of claims 1 to 4, further comprising a flat protrusion continuous to the annular projection of the protector on the proximal side of the annular projection.