JP2000084078A - Syringe with needle cap - Google Patents

Abstract

(57) [Summary] (with correction) [Problem] To prevent a needle cap from being easily removed when not in use. SOLUTION: A needle attachment member 5 provided with a small-diameter cylindrical portion 4 at a front end of a syringe main body 1 and attached so that a needle 9 projects forward.
And a needle cap 12 that is fitted to the needle mounting member to cover the needle, and is locked to the needle mounting member and the needle cap in a fitted state. Locking means such as ridges 13 are provided, and the needle mounting members are provided with inclined surfaces 15, 10 with steps 16, 11, which are displaced in the axial and circumferential directions by being inclined forward and backward, respectively, in opposite directions, Furthermore, a state in which the needle mounting member is fitted to the needle mounting member, and a slope 19 with a step 19 that can contact the front stepped slope is provided, and the needle mounting member is also fitted to the small-diameter cylindrical portion of the syringe body. To provide a slope 8 with a step 8 which can contact the slope with a step on the rear side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a syringe with a needle cap.

[0002]

2. Description of the Related Art If a needle cap of a syringe is easily removed, an accident in which a needle is erroneously stabbed in a finger of a medical staff or the like may increase. Therefore, the needle cap and the syringe body are often provided with locking means.

[0003] However, if the needle cap and the syringe body are structured to be locked, it is necessary to hold the syringe body with one hand and pinch the needle cap with the other hand and pull it out strongly when performing injection. It was difficult to remove with one hand.

In addition, the used syringe is often discarded. In this case, it is desirable to remove the needle for safety reasons.

However, in the conventional syringe, it is troublesome to remove the needle from the syringe body.

[0006]

SUMMARY OF THE INVENTION Therefore, according to the present invention, it is possible to lock a fitted needle cap so that the needle cap does not easily come off when not in use, and to lock the needle cap when performing injection. It is an object of the present invention to provide a syringe with a needle cap that can easily remove the needle cap by one-handed operation and remove the needle from the syringe when used and discarded after use.

[0007]

In order to solve the above-mentioned problems, a syringe with a needle cap according to the present invention comprises a syringe body 1
A needle mounting member 5 provided with a small-diameter cylindrical portion 4 at the front end thereof and having a needle 9 mounted so as to protrude forward is detachable from the small-diameter cylindrical portion 4, and is fitted to the needle mounting member 5. A needle cap 12 for covering the needle 9 with a needle, and the ridge 1 is engaged with the needle mounting member 5 and the needle cap 12 in a state of being fitted to each other.
An inclined surface 1 having steps 16, 11 which are provided with locking means such as 3, 17 and the like, and are displaced in the axial direction and the circumferential direction in the needle mounting member 5 by being inclined forward and backward, respectively, in opposite directions.
5 and 10, and furthermore, the above-described inclined surface 1 with the step 16 on the front side in a state where the needle mounting member 5 is fitted to the needle cap 12.
5 is provided with an inclined surface 18 having a step 19 which can be contacted, and the needle attaching member 5 is also fitted to the small-diameter cylindrical portion 4 of the syringe main body 1 so that it can contact the inclined surface 10 having the step 11 on the rear side. Characterized in that an inclined surface 7 with a step 8 is provided.
The configuration is adopted.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. First, in the drawing, reference numeral 1 indicates a syringe body.
The syringe body 1 is, as shown in FIG.
And a piston 3 that is slidable in the front-rear direction with respect to the cylinder 2, and a small-diameter cylindrical portion 4 protrudes from the front end of the cylinder 2. A needle mounting member 5 is detachably attached to the small-diameter cylindrical portion 4, and a needle mounting member receiver 6 for abutting a rear end edge of the needle mounting member 5 on a front end edge thereof is provided on an outer peripheral portion thereof. That is, the small-diameter cylindrical portion 4 is configured such that a portion other than the needle mounting member receiver 6 is inserted inside the needle mounting member 5.

The front end of the needle mounting member receiver 6 is provided with an inclined surface 7 that is displaced in the front-rear direction, that is, in the axial direction and in the circumferential direction. The inclined surface 7 is partially provided with an axial step 8, and the inclined surface 7 is displaced in the axial direction at the position of the step 8.

Next, the needle mounting member 5 mounts the needle 9 so as to protrude forward. The needle mounting member 5 is detachable from the small-diameter cylindrical portion 4 of the syringe main body 1 as described above, and has a slope 10 having the same slope as the slope 7 at its rear end. An axial step 11 is also provided on a part of the inclined surface 10, and the inclined surface 10 is shifted in the axial direction at the position of the step 11. When the needle mounting member 5 is fitted to the small-diameter cylindrical portion 4, the inclined surface 10 of the needle mounting member 5 comes into contact with the inclined surface 7 of the needle mounting member receiver 6, as shown in FIG.
Further, the step portion 11 of the needle mounting member 5 comes into contact with the step portion 8 of the needle mounting member receiver 6.

A needle mounting member 5 is attached to the small diameter cylindrical portion 4 of the syringe body 1.
Is fitted, the needle mounting member 5 can rotate in the circumferential direction with respect to the small-diameter cylindrical portion 4, that is, in the left direction when viewed from the front, but in the opposite direction, that is, in the right direction, the step portion 8. 11
They cannot rotate because they come into contact with each other.

When the needle mounting member 5 is rotated leftward with respect to the small-diameter cylindrical portion 4, the rotational force is reduced by the action of the inclined surface 7 of the small-diameter cylindrical portion 4 and the inclined surface 10 of the needle mounting member 5. Is converted into a force for pushing the needle forward in the axial direction, and the needle mounting member 5 can be detached from the small-diameter cylindrical portion 4 by moving forward.

A needle cap 12 to be described later can be fitted to the needle mounting member 5. A circumferential projection is provided on the outer periphery of the needle mounting member 5 to lock the fitted needle cap 12. Article 13 is provided. The ridge 13 may be provided on the entire circumferential direction, or may be provided only on a part of the circumferential direction.

Similarly, on the outer peripheral portion of the needle mounting member 5, a needle cap receiver 14 for abutting a rear end opening edge of the fitted needle cap 12 with its front edge at a position rearward from the above-mentioned ridge 13.
Is provided. The needle cap receiver 14 has an inclined surface 15 at its front end edge which is displaced in the front-rear direction, that is, in the axial direction and in the circumferential direction. The inclined surface 15 is partially provided with an axial step 16, and the inclined surface 15 is shifted in the axial direction at the position of the step 16. The directions of the inclined surface 15 and the inclined surface 10 are reversed.

Next, the needle cap 12 has a hollow cylindrical shape with an open rear end, and is fitted to the needle mounting member 5 as described above.
The needle 9 can be accommodated therein.

The needle cap 12 is fitted to the needle mounting member 5 on the inner surface near the rear edge of the opening.
(See FIG. 4). Note that both the needle cap 12 and the needle mounting member 5 are made of plastic, and the protrusion 17 of the needle cap 12 can pass over the protrusion 13 of the needle mounting member 5 by elastic deformation.

Further, at the rear end opening edge of the needle cap 12,
An inclined surface 18 displaced in the front-rear direction, that is, the axial direction and the circumferential direction is provided. The inclined surface 18 is partially provided with a step 19 in the axial direction, and at the position of the step 19, the inclined surface 18 is shifted in the axial direction. This needle cap 12
The inclined surface 18 provided on the needle cap receiver 14 and the inclined surface 15 provided on the needle cap receiver 14 have the same gradient, and the inclined surface 18 of the needle cap 12 is fitted with the needle cap 12 fitted to the needle mounting member 5.
Comes into contact with the inclined surface 15 of the needle cap receiver 14, and the step 18 provided on the inclined surface 18 of the needle cap 12 also comes into contact with the step 16 provided on the inclined surface 15 of the needle cap receiver 14. I have.

While the needle cap 12 is fitted to the needle mounting member 5, it can rotate in one of the circumferential directions, that is, rightward when viewed from the front, but in the opposite direction, that is, leftward, the step 16, 19 cannot be rotated because they come into contact with each other.

When the needle cap 12 is rotated to the right with respect to the needle mounting member 5, the rotational force causes the needle cap 12 to move in the axial direction by the action of the inclined surface 15 of the needle mounting member 5 and the inclined surface 18 of the needle cap 12. Is converted into a force to push forward, and the needle cap 12 moves forward, so that the needle mounting member 5 is moved.
It can be removed from.

To remove the needle cap 12 from the syringe body 1 for performing an injection, the following operation is performed. It is assumed that the needle mounting member 5 is fitted to the syringe body 1 and the needle cap 12 is fitted to the needle mounting member 5. That is,
As shown in FIG. 5, the thumb of one hand holding the syringe body 1 is applied to the side surface of the needle cap 12, and the inclined surface 18 of the needle cap 12 is pressed against the inclined surface 15 of the needle cap receiver 14, that is, forward. Needle cap 1 to the right as viewed from
Rotate 2. As described above, the rotational force applied to the needle cap 12 is converted into a force for pushing the needle cap 12 in the axial direction by the action of the inclined surface 15 of the needle cap receiver 14 and the inclined surface 18 of the needle cap 12. This allows
The needle cap 12 moves forward with respect to the needle mounting member 5,
The locked state between the ridge 17 of the needle cap 12 and the ridge 13 of the needle mounting member 5 is eliminated. Therefore, the needle cap 12 can be easily removed from the syringe body 1 by one-handed operation.

In order to discard the used syringe,
When removing the needle 9 from the syringe main body 1, the following operation is performed. That is, as shown in FIG. 6, in a state where the needle mounting member 5 is fitted to the small diameter cylindrical portion 4 of the syringe main body 1, the thumb of one hand holding the syringe main body 1 is applied to the side surface of the needle mounting member 5. Then, the needle mounting member 5 is rotated in a direction in which the inclined surface 10 of the needle mounting member 5 is pressed against the inclined surface 7 of the needle mounting member receiver 6, that is, leftward when viewed from the front. As described above, the rotational force applied to the needle mounting member 5 is converted into a force for pushing the needle mounting member 5 in the axial direction by the action of the inclined surface 7 of the needle mounting member receiver 6 and the inclined surface 10 of the needle mounting member 5. As a result, the needle mounting member 5 can be moved forward with respect to the small-diameter tube portion 4 and can be removed from the small-diameter tube portion 4.

In the above embodiment, the needle cap 12
The inclined surface 18 is provided on the rear end opening edge of the needle cap 12, but the inclined surface 18 may be provided on the inner surface of the needle cap 12, as shown in FIG. According to such a configuration, in a state where the needle cap 12 is fitted to the needle mounting member 5,
Both of the inclined surfaces 18 and 15 can be concealed, and the appearance design can be improved. Similarly, in the above embodiment, the inclined surface 1 provided on the needle mounting member 5
Although 0 is provided on the rear end edge of the needle mounting member 5, this inclined surface 10 may be provided on the inner surface of the needle mounting member 5 as shown in FIG.

In the above embodiment, the needle mounting member 5 is rotatable leftward as viewed from the front with respect to the small-diameter cylindrical portion 4, and is prevented from rotating rightward. 5 is configured to be rotatable to the right as viewed from the front and to prevent rotation to the left, but these rotation directions may be reversed.

In the above-described embodiment, the locking means is not provided on the small-diameter cylindrical portion 4 of the syringe body 1 and the needle mounting member 5 fitted thereto. Locking means similar to the protrusions 13 and 17 provided on the needle cap 12 may be provided.

[0025]

The syringe with a needle cap according to the present invention is as described above. When the needle cap 12 is fitted on the needle mounting member 5, they are locked to each other by the projections 17, 13 and the like. As a result, the needle cap 12 does not come off easily. Therefore, it is possible to prevent the needle 9 from being accidentally stabbed by a finger of a medical worker. In addition, when performing an injection, the needle cap 12 can be easily removed from the needle mounting member 5 by rotating the needle cap 12 with one-handed operation, so that it is convenient to use. Also, when discarded after use, the needle 9 can be removed from the syringe body 1, so that it is safe. And the removal work of the needle 9
It is very simple because it is only necessary to rotate the needle mounting member 5 with one hand operation. In addition, since the rotation direction when removing the needle cap 12 and the rotation direction when removing the needle attachment member 5 are reversed, there is no concern that the needle attachment member 5 will come off together when removing the needle cap 12.

[Brief description of the drawings]

FIG. 1 is a side view of a state where a needle cap, a needle mounting member, and a syringe main body are separated.

FIG. 2 is a plan view showing a state where a needle cap, a needle mounting member, and a syringe main body are separated.

FIG. 3 is a bottom view in a state where a needle cap, a needle mounting member, and a syringe main body are separated.

FIG. 4 is a partially cutaway side view showing a state in which a needle cap, a needle mounting member, and a syringe main body are integrally fitted.

FIG. 5 is a side view showing an operation of removing a needle cap.

FIG. 6 is a side view showing an operation of removing a needle attachment member.

FIG. 7 is a sectional view of a needle cap.

FIG. 8 is a partially cutaway side view of the needle attachment member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Syringe main body 2 Cylinder 3 Piston 4 Small diameter cylinder part 5 Needle attachment member 6 Needle attachment member receiver 7 Inclined surface 8 Stepped portion 9 Needle 10 Inclined surface 11 Stepped portion 12 Needle cap 13 Protrusion 14 Needle cap receiver 15 Inclined surface 16 Stepped portion 17 Ridge 18 Slope 19 Step

Claims (1)

[Claims] 1. A needle mounting member 5 having a small-diameter cylindrical portion 4 provided at the front end of a syringe main body 1 and mounting a needle 9 so as to protrude forward.
The needle cap 12 covers the needle 9 by being attached to and detached from the small-diameter cylindrical portion 4.
And locking means such as ridges 13 and 17 for locking the needle mounting member 5 and the needle cap 12 with each other in a fitted state. The needle mounting member 5 is directed forward and rearward and opposite to each other. Inclined surfaces 15, 10 with steps 16, 11 displaced in the axial direction and the circumferential direction by being inclined to
An inclined surface 18 with a step 19 which can be brought into contact with the inclined surface 15 with the step 16 on the front side while the needle mounting member 5 is fitted to the needle cap 12 is provided, and the needle is also attached to the small-diameter cylindrical portion 4 of the syringe body 1. When the member 5 is fitted, the inclined surface 7 with a step 8 can contact the inclined surface 10 with the step 11 on the rear side.
A syringe with a needle cap.