JP3452167B2 - Safety syringe - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safe syringe in which a needle attached to a syringe (on a syringe) can be removed and discarded without being directly touched after use.

[0002]

2. Description of the Related Art In a hospital or a laboratory, a syringe equipped with an injection needle is often used for the purpose of administering a fluid to a living body. Therefore, when removing a used injection needle from a syringe, a medical worker erroneously punctured his / her body with the injection needle or attached it to the injection needle or the syringe (remained).
It was often contaminated by the patient's blood.
Recently, even among medical professionals, interest in infections such as hepatitis and AIDS has increased, and some medical devices have been devised to prevent such infections. Accidental puncture
It is apt to occur when the needle cover is put on after using the syringe, and contamination by the patient's blood remaining in the syringe often occurs when the needle is removed from the syringe. As a result, most of the improved medical devices are needle / syringe integrated so that the needle cover does not have to be covered and the needle does not have to be removed from the syringe after injection. It was a complicated one. For example, JP-A-6-7448 and JP-A-6-233820 disclose those having a structure for retracting an injection needle into an outer cylinder after use, and JP-A-6-39036 discloses a method. Later, it is disclosed to have a shield mechanism for covering the injection needle.

However, these devices have a great drawback that they are expensive when applied to a disposable syringe because of their complicated structure. There was also a problem when disposing of these used syringes. That is, since the waste is a mixture of a metal injection needle and a synthetic resin injection syringe and may be contaminated, conventionally, a waste disposal specialist was often requested. In that case, the above things are discarded with the syringe attached, so the volume is large,
Extra cost will be incurred. Further, if these materials are incinerated as they are, there is a risk that toxic gas will be generated and that the high temperature will damage the incinerator.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a safe syringe in which a used needle can be safely and reliably removed from a syringe and discarded by a simple structure. An object of the present invention is to provide a syringe that can be removed from the syringe without touching the needle and that the needle and the syringe can be separately discarded.

In the present invention, the inner cylinder and the inner cylinder can be inserted,
A luer tip is formed on the tip for attaching an injection needle
The outside of the syringe, which consists of
Safely installed to cover by needle removal means
A syringe, wherein a luer tip penetrates through the hole of the needle removing means.
With the needle pulled out, the needle is removed from the outer cylinder with the needle pulled out.
Means is movable on the outer cylinder and slidingly in the axial direction, the locking means for locking the slidingly on the outer tube to the inner surface is formed, prior to
The locking means can be screwed with the engaging means formed on the outer surface of the outer cylinder.
, And the addition, the diameter of said (formed removed means) hole is one less than the needle hub outer diameter of the needle, before
By the movement in the axial direction by the removing means, the luarch
The safety feature is that the injection needle attached to the cup is removed.
The above problems were solved by all the syringes .

[0006] On the outer cylinder of the syringe, the above-mentioned needle withdrawing means is covered and attached with the luer tip of the outer cylinder penetrating through the hole formed in the tip surface of the needle withdrawing means, and the injection needle is attached to the penetrating luer tip. To do. The syringe is used as usual after the outer cylinder and the needle withdrawing means are locked (preventing free movement) by the locking means formed on the inner surface of the needle withdrawing means. After use, the outer cylinder and the needle withdrawing means are disengaged to allow the needle withdrawing means to freely slide on the outer cylinder, and only the needle withdrawing means is slid toward the tip side. By the needle withdrawing means, the injection needle pushed in the distal direction is withdrawn from the luer tip of the outer cylinder which is not sliding. That is, the hole of the needle withdrawing means has a diameter larger than the outer diameter of the luer tip, but since it is smaller than the outer diameter of the needle base of the injection needle, only the injection needle can pass through the hole of the needle withdrawing means. Instead, it is removed from the outer cylinder.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is a cylindrical needle withdrawing means which is mounted on the outer cylinder of a normal medical injector and can be slid on the outer cylinder to move in the axial direction. On the inner surface of the needle removing means,
A locking means that is an annular protrusion is formed, and this locking means engages with the engaging means of the annular groove formed on the outer surface of the outer cylinder,
The free movement of the needle withdrawal means on the outer cylinder is prevented. In addition, a hole through which the lure tip of the outer cylinder can penetrate is formed on the tip surface of the needle withdrawing means, and the diameter of this hole is smaller than the outer diameter of the needle base of the injection needle attached to the luer tip. The needle cannot pass through this hole.

The shape of the locking means is not limited to the annular projection, but the needle withdrawing means and the outer cylinder can be locked by engaging with the engaging means formed on the outer surface of the outer cylinder. I wish I had it. For example, when the engaging means formed on the outer cylinder is an annular protrusion, a female screw or the like formed on the needle withdrawing means so as to be screwed onto the annular protrusion may be used. The position where the locking means is formed is not particularly limited, but it is preferably formed at the base end portion of the needle withdrawing means, and there is no waste. In this specification,
The distal end refers to the end of the syringe to which the injection needle is connected, and the proximal end refers to the opposite end.

The present invention is not limited to the above-mentioned needle removing means,
It also includes a safety syringe composed of a medical syringe and a needle removing means mounted on the outer cylinder thereof. That is, the needle withdrawing means as described above can be freely slidable and locked on the outer cylinder, the injection needle is withdrawn by the cooperative action with the outer cylinder, and the outside of the medical injector can be used as a hole for the needle withdrawing means. It is a safety syringe that is covered and attached with a luer tip penetrating therethrough.

Although overlapping, the outer surface of the outer cylinder of this safety syringe is formed with engaging means for engaging with the locking means of the needle withdrawing means to lock the needle withdrawing means with the outer cylinder. There is. For example, the locking means of the needle withdrawing means is an annular protrusion formed on the inner surface of the base end portion, and the engaging means is a screw formed on the proximal end portion or the middle portion of the outer cylinder. It is preferable that they can be screwed together. More specifically, the locking means of the needle withdrawing means and the engaging means of the outer cylinder can be screwed together, so that when the needle withdrawing means is rotated, the needle withdrawing means can dynamically move on the outer cylinder. It is easy to remove the needle from the syringe and it is easy to use. As described above, if the locking means is an annular projection and the engaging means is an annular groove that can engage with the annular projection, it is structurally simple, but a syringe (outer cylinder)
When removing the injection needle from, it is difficult to remove, and a larger force is required. In addition, if a large force is instantaneously applied to the needle withdrawing means, the injection needle may fall off suddenly, which is dangerous. On the other hand, the above-mentioned one in which the needle withdrawing means and the outer cylinder are movable by screwing has a mechanism for gradually pushing out the injection needle attached to the outer cylinder by rotating the needle withdrawing means. The injection needle can be easily withdrawn with less force and without difficulty.

The position of the screw formed on the outer cylinder is not particularly limited and can be changed as required.
The size of the needle withdrawing means changes depending on the position where the screw is formed on the outer cylinder, and the axial length of the needle removing means inevitably becomes long when the screw position is provided at the outer cylinder base end. Shortening the position of the screw at the tip of the outer cylinder shortens it. Generally, the shorter the needle removal means is, the less wasteful and easier to handle,
If it is too short, the hand that operates the needle withdrawing means touches the injection needle, and the original meaning is lost. Further, if the base end of the needle withdrawing means is caught on the scale engraved on the syringe outer cylinder, the injection amount is difficult to see and the condition is bad, so it must be taken into consideration. From the above circumstances, it is desirable that the screw is formed in the middle portion or the base end portion of the outer cylinder.

The area for forming the female screw in the needle withdrawing means or the area for forming the male screw in the outer cylinder is preferably in the range of 1 to 15 mm. Even if the forming area is too long, it is wasteful and costly. If the distance is too short, the moving distance of the needle withdrawing means becomes short and the effect of withdrawing the injection needle decreases.

The pitch of the female screw or the male screw is 1 to 4.
It is preferably in the range of 5 mm, and if it is too short,
The movement distance of the needle withdrawing means with respect to the rotation amount decreases, and the time required for removing the injection needle increases, and if it is too long, the needle withdrawing means becomes difficult to rotate.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A more specific embodiment of the present invention will be shown below with reference to the drawings.

As shown in FIG. 1, the safety syringe 1 comprises an inner cylinder 2, an outer cylinder 3 and a needle removing means 4. A luer tip 6 with a taper for mounting the injection needle 5 is formed on the tip of the outer cylinder 3, and the outer cylinder 3 is attached to the inner cylinder 2 from its proximal end side.
Has been inserted. A collar 7 is formed at the base end of the outer cylinder 3. Both ends of the needle withdrawing means 4 are open, and the inner cavity of the needle withdrawing means 4 and the open end 8 on the base end side have an inner diameter such that the outer cylinder 3 can be inserted except for the collar 7, and the tip end portion The side hole 9 has a diameter through which the lure tip 6 can pass. As shown in FIG. 1, the luer tip 6 of the outer cylinder 3 penetrates the hole 9 of the needle removing means 4, and the injection needle 5 is attached to the tip thereof. Further, an annular projection 10 (locking means) is formed on the inner surface of the needle removing means 4 on the base end side, and a female screw 11 (engagement engaging with the annular projection 10 on the outer surface of the outer cylinder 3 on the base end side. Means) is formed, and the needle withdrawing means 4 is attached to the outside of the outer cylinder 3 by coating so that the locking means and the engaging means can be screwed together.

As shown in FIG. 3, the length of the needle withdrawing means 4 can be shortened by providing a female screw 11 in the outer middle portion of the outer cylinder 3, but in this case, the needle withdrawing means 4 is used.
The size and shape of the needle withdrawing means 4 so that the visibility of the volume scale formed on the outer cylinder 3 is not hindered by the base end of
Alternatively, it is necessary to devise the formation position of the female screw 11 and the like.

Next, the method of using the syringe and the function, action and relation of each part will be described. First, before using the syringe, as shown in FIG. 1, the luer tip 6 of the outer cylinder 3 penetrates the hole 9 of the needle withdrawing means 4, and the female screw 11 of the outer cylinder is screwed into the annular protrusion of the needle withdrawing means. , The needle removing means 4 on the outside of the outer cylinder 3
Is covered. The injection needle 5 may be attached to the lure tip 6 in advance, or may be attached when the syringe is used. When using the syringe 1, the injection needle 5 is attached to the luer tip 6, the inner cylinder 2 is pulled toward the base end side with respect to the outer cylinder 3 to inhale the drug solution into the syringe 1, and then the inner cylinder 2 The liquid medicine is injected into the body by pressing on the tip side. After use, as shown in FIG. 2, by rotating the needle removing means 4 while holding the end portion of the outer cylinder 3 such as the collar 7, the annular projection 10 screwed into the female screw 11 of the outer cylinder 3 is removed. Needle removal means 4
To the tip side. Since the outer diameter of the needle base 12 of the injection needle 5 is larger than the hole 9 of the needle removing means 4, it cannot pass through the hole 9. The injection needle 5 attached to the lure tip 6
Is pushed in the distal direction by the needle removing means 4 that has moved relatively to the distal end side with respect to the outer cylinder 3 and is withdrawn from the outer cylinder 3. That is, the injection needle 5 can be easily removed from the outer cylinder 3 by rotating the needle removing means 4 after use.

[0018]

After using the syringe, the used needle can be removed from the syringe without touching the needle with a hand, and the needle and the syringe can be discarded separately. Therefore, it is possible to prevent accidental puncture and infection by medical staff (doctors and nurses), which is safe. Furthermore, since the injection needle and the syringe can be separately disposed, the risk of erroneous puncture caused by careless touching of the injection needle by a person who does not know the contents, or the risk of contamination by blood or the like is reduced. Furthermore, by separately disposing of the injection needle and the syringe, the amount of disposal requested to the disposal company is reduced, and the disposal cost is reduced.

[Brief description of drawings]

FIG. 1 is a front cross-sectional view showing a state before using the safety syringe of the present invention.

FIG. 2 is a front sectional view showing a state in which the injection needle is removed after use.

FIG. 3 is a front sectional view schematically showing a safety syringe according to another embodiment.

[Explanation of symbols]

1. Safety syringe 2. Inner cylinder 3. Outer cylinder 4. Needle removal means 5. Needle 6. Lure tip 7. Tsuba 8. Open end 9. Hole 10. Annular protrusion (locking means) 11. Female screw (engagement means) 12. Needle base (injection needle)

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References Japanese Patent Laid-Open No. 6-7447 (JP, A) Actual Opening 3-70145 (JP, U) Actual Opening 1-120852 (JP, U) International Publication 95/021646 (WO, A1) (58) Fields investigated (Int.Cl. ⁷ , DB name) A61M 5/32

Claims (7)

(57) [Claims] 1. An inner cylinder and an inner cylinder into which the inner cylinder can be inserted and an injection needle at the tip.
Do not use an outer cylinder with a luer tip for attaching
A needle withdrawal means with a hole formed on the tip of the outside of the syringe
Is a safety syringe fitted to
And the lure tip has penetrated the hole of the needle removing means.
The needle withdrawing means is attached to the outer cylinder, and the needle withdrawing means is slidable on the outer cylinder and movable in the axial direction, and the inner side surface is locked with the slidable means on the outer cylinder. And the locking means is formed.
Is engageable with the engaging means formed on the outer surface of the outer cylinder.
Further, the diameter of the hole (formed in the removing means) is smaller than the outer diameter of the needle base of the injection needle, and
It is attached to the lure tip by the movement in the axial direction.
A safety syringe characterized by removing an injection needle to be removed. 2. The safety syringe according to claim 1, wherein the locking means is a screw. 3. The safety syringe according to claim 2, wherein a screw capable of being screwed with the locking means is formed on the outer surface of the outer cylinder. 4. The safety syringe according to claim 3, wherein the screw (formed on the outer surface of the outer cylinder) is formed in the middle portion of the outer cylinder. 5. The safety syringe according to claim 3, wherein the screw (formed on the outer surface of the outer cylinder) is formed on the proximal end portion of the outer cylinder. 6. A thread forming region in the needle removing means,
Alternatively, the screw forming area of the outer cylinder is 1 to 15 mm.
The safety syringe according to claim 2, 3, 4, or 5. 7. The pitch of the screw formed on the needle withdrawing means or the screw formed on the outer cylinder is 1 to 4.5 mm.
The safety syringe according to claim 2, 3, 4, or 5.