KR200249104Y1 - Safety syringe - Google Patents

Abstract

The present invention relates to a safety syringe, comprising: a retaining device formed on the front end of the barrel, a plurality of bosses formed on the needle hub to rotatably correspond to the retaining device, a plurality of recesses formed inside the needle hub; A plurality of inclined teeth formed on the plunger to correspond to the concave portion, wherein the engagement between the retaining device and the boss of the needle hub is releasable by rotational movement of the needle hub and plunger by the combination of the inclined teeth and the concave portion It features.

Description

Syringe {SAFETY SYRINGE}

The present invention relates to a syringe, in particular a safety syringe having a ratchet device formed on the needle hub and annular inclined teeth formed on one end of the plunger, the hollow barrel being pushed towards the needle hub. The engagement between the cheat device and the inclined tooth pulls the needle hub with the needle into the barrel when the plunger is pulled backwards to prevent a person being stabbed by the used needle.

The plastic cap is always mounted on the hollow barrel of the syringe to cover the needle to prevent people from being stabbed by the needle used. However, the user can be stabbed by the needle used because the user must hold the conventional cap when placing the cap on the hollow barrel. In addition, the used needles should be melted or burned away to prevent the spread of disease. However, harmful gases are generated when the needle is melted or burned together with the plastic cap and the needle hub.

In another conventional embodiment, a safety device is formed in the syringe to prevent the user from being stabbed by the needle used. A clamp is formed on the needle hub and plunger of the syringe. The clamps engage each other once the plunger is pushed completely into the hollow barrel of the syringe. The needle hub with the needle is released when the plunger is pulled back and pulled completely into the barrel. The needle used is kept completely enclosed in the hollow barrel to keep the needle from any contact or puncture.

However, certain molds are required to mold the clamps. Therefore, manufacturing a syringe with a conventional safety device is expensive. In addition, since the entire syringe includes a hollow barrel, a plunger and a hub, harmful gases are generated when the needle is melted or burned.

In order to reduce manufacturing costs, the development of improved syringes that attract needles used inside the barrel has become a focus. Referring to FIG. 1, a conventional safety syringe includes a hollow barrel 10, a plunger 20, a needle hub 30, and a needle 40.

The needle hub 30 forms a receiving hole 301 in the rear end of the needle hub 30 and a shoulder 302 formed inside the receiving hole 301. The plunger 20 has a conical head 201 formed at the front end of the plunger 20 to correspond to the receiving hole 301. In this arrangement, when the plunger 20 moves inside the barrel 10 toward the needle hub 30 to engage the needle hub 30, the conical head 201 interferes with the inside of the receiving hole 301. Due to the formation of the shoulder 302, the conical head 201 is fixed inside the receiving hole 301, and after the plunger 20 is pushed all the way to the end of the hollow barrel 10, the plunger 20 is removed from the barrel ( 10) Pulling back inward pulls the needle hub 30 together with the needle 40 simultaneously into the barrel 20 (see FIG. 2).

However, in order to easily pull the needle hub 30 into the barrel 10, the engagement of the needle hub 30 and the barrel 10 should be loose, in other words, the needle hub 30 and the barrel 10. The friction between the inner circumference of the cross section must be able to overwhelm the connection between the plunger 20 and the needle hub 30, and the needle hub 30 can preferably not be pulled back into the barrel 10. At this time, if the engagement between the needle hub 30 and the barrel 10 is loose, the solution inside the barrel leaks and cannot be injected well. In addition, when the needle 40 is inserted into the container 50 through the cock 51, the needle hub 30 can be displaced in the opposite direction in the barrel 10. When the needle hub 30 moves forward, the engagement between the conical head 201 and the shoulder 302 may not be surely combined with each other. As the needle hub 30 moves rearward in the vane 10, too early engagement between the shoulder 302 and the conical head 201 results in an increase in residual solution in the vane 10.

However, if the engagement between the needle hub 30 and the barrel 10 is increased, the force for pulling the needle hub 30 with the needle 40 into the barrel 10 is increased to put additional burden on the user. It becomes.

Referring to FIG. 5, reducing the diameter of the receiving hole 301 or increasing the diameter of the conical head 201 in order to increase the engagement force between the needle hub 30 and the panel 10 may include a receiving hole ( The effort of inserting the conical head 201 into 301 inevitably increases, which is most unsuitable for the user.

Another drawback of conventional syringes is that when the user uses the syringe, the user must vent the air inside the barrel 10 as usual from the barrel, which often leads to the engagement between the conical head 201 and the shoulder 302, The result is an unused syringe due to premature engagement between the conical head 201 and the shoulder 302.

Another drawback of conventional syringes is that there is no positioning device provided to allow the needle to move laterally as the needle 40 is pulled back into the barrel 10. Thus, when the plunger is pushed forward into the vane, the needle 40 will extend further out of the barrel 10 from the outlet (not shown) of the barrel 10 if the inclined angle of the needle 40 is not sufficient. . In addition, if the barrel 10 faces the ground, the needle may extend out of the barrel by the gravitational effect, causing an accidental injury to the user.

The present invention seeks to provide an improved safety syringe for mitigating or alleviating the above problems.

It is an object of the present invention to provide a syringe capable of alleviating the barrel's limitation on the needle hub such that the needle hub with the needle can be easily pulled back into the barrel.

Another object of the present invention is to provide a syringe capable of providing a solution seal inside the barrel by engagement between the needle hub and the barrel such that the needle hub slidably engages the barrel without leakage.

Another object of the present invention is to provide a latching device formed on one end of the needle hub and an inclined tooth formed on one end of the plunger corresponding to the latching device of the needle hub, thereby engaging the ratchet device and the inclined tooth. It is to provide a syringe which is easy to retreat into a panel of a needle hub provided with the needle.

Another object of the present invention is a conical front end, a plurality of bosses formed in the circumference of the front end corresponding to the trough of the barrel, an axially formed hole, a receiving hole formed to communicate with the hole, the inclined receiving hole It is to provide a safety syringe of a needle hub having a plurality of recesses formed in the circumference and a shoulder formed in the circumference of the receiving hole and over the recess corresponding to the conical head of the plunger. In this arrangement, the needle hub is tightly engaged with the plunger after the plunger is pushed to the end of the barrel to engage the needle hub so that no medical resources are wasted.

Another object of the present invention is to provide a safety syringe having a conical head and a corresponding shoulder corresponding to the conical head. Thus, even if the plunger is accidentally pushed so that the plunger is engaged with the needle hub, if the plunger is not rotated, the plunger can be pulled to release the needle hub by the action of the latch device required to rotate the plunger.

Other objects and advantages of the present invention will be described in detail below with reference to the accompanying drawings.

1 is a cross-sectional view of a conventional syringe;

FIG. 2 is a cross sectional view of the syringe shown in FIG. 1 with the needle hub pulled into the barrel; FIG.

3 is a schematic diagram showing a needle hub with a needle pushed back into the barrel by a loose connection between the needle hub and the barrel;

4 and 5 are cross-sectional views showing that the conical head or receiving hole configuration has been modified to increase the connecting force between the barrel and the needle hub;

6 is an enlarged perspective view showing a syringe according to the present invention;

7 is a partially enlarged cross-sectional view of the front end of the barrel according to the present invention;

8 is a partially enlarged cross-sectional view of a needle hub according to the present invention;

9 and 10 are cross-sectional views showing the movement of the plunger inside the barrel for connecting with the needle hub;

11 is a cross-sectional view showing the rotation of the plunger for tightly connecting with the needle hub; And

12 is a cross sectional view of a needle hub with a needle pulled back into the barrel;

* Explanation of symbols for the main parts of the drawings

1: barrel 2: plunger

3: needle hub 4: needle

11: hole 13: taper

21: Neck 22: Rubber Seal

23: conical head 24: inclined tooth

25 push rod 26 flange

6, the syringe according to the present invention includes a barrel 1, a plunger 2, a needle hub 3, and a needle 4.

As shown in Figs. 6 and 7, the barrel 1 is provided with a through hole 11 in the axial direction, and has a retaining device 110 formed on the front end of the barrel. The retaining device has a plurality of equally spaced fingers 111 formed on an inner circumferential portion forming the through hole 11, and a trough 112 is formed between two adjacent fingers 111, respectively. . Each finger is L-shaped, and each trough 112 is also L-shaped. The end of the through hole 11 has a taper portion 13 in its inner circumference to retract the plunger 2 from the barrel 1 so that the plunger can be easily pulled out of the barrel 1.

Referring again to FIG. 6, the plunger 2 includes a neck 21 formed at the front end to fit the rubber seal, a conical head 23 protruding from the neck 21, and a plurality of spatially inclined teeth 24. And an elastic push rod 25 formed on the end of the conical head 23 and a flange 26 formed in the plunger 2 opposite to the elastic push rod 25.

6 and 8, the needle hub 3 has a conical front end 31, a plurality of bosses 32 formed on the circumference of the front end 31 to correspond to the trough 112 of the barrel 1. , A plurality of recesses 35 formed in the circumference of the receiving hole 34 so as to correspond to the hole 33 formed in the axial direction, the receiving hole 34 formed in communication with the hole 33, and the inclined teeth 24. And a shoulder 36 formed on the recess 35 in the circumference of the receiving hole 33 so as to correspond to the conical head 23 of the plunger 2. The needle hub 3 is adapted to hold the needle 4 on its front end 31. The seal ring 37 is mounted on the needle hub 3 so as not to fall out of the barrel.

The needle 4 consists of a sleeve 41 and a metal tube 42.

When the syringe of the present invention is assembled, the needle hub 3 is inserted into the sleeve 41 of the needle 4 to interfere with the needle 4. Thereafter, the needle hub 3 with the needle 4 is inserted into the panel 1 so that each boss 32 is received in the corresponding trough 112, and the L-shaped finger 111 Clamped by. The boss 32 is configured to be accommodated in the trough 112 by rotating the needle hub 3 and the needle 4. In this arrangement, the needle hub 3 with the needle 4 is provided with a barrel 1. The needle hub 3 and the needle 4 can be avoided from being pushed into the barrel 1 when the needle is inserted into the cork, as shown in Fig. 3. The syringe according to the present invention is used in use. The user inserts the plunger 2 into the barrel 1. Since the rubber seal 22 is firmly received in the neck 21 of the plunger 2, the solution inside the barrel 1 is completely out of the barrel. Can be injected.

Referring to FIG. 9, after the solution is emptied inside the barrel 1, the user continues to push the plunger 2 to force the conical head 23 so that the push rod 25 extends into the receiving hole 34. Thus, the elastic push rod 25 is positioned inside the inner circumference of the hole 33. When the conical head 23 of the plunger 2 extends into the receiving hole 34, the inclined teeth 24 are received in the recess 35, and the engagement between the neck 21 and the conical head 23 is provided. Engage shoulder 36 as shown in FIG.

Thereafter, as shown in FIG. 11, the user rotates the plunger 2 to engage between the inclined teeth 24 and the concave portion 35, and the L-shaped finger 111 to the boss 35. The needle hub 3 is rotated simultaneously to release the restriction. After the restriction of the finger 111 to the boss 32 is released, the engagement of the conical head 23 to the shoulder 36 causes the user to move the needle hub 3 with the needle 4 back into the barrel 1. Makes it possible to attract.

Referring to FIG. 12, when the needle hub 3 with the needle 4 is pulled back into the barrel 1, the elastic push rod 25 moves the needle 4 into the through hole 11 of the barrel 1. It is pressed against the needle hub 3 with the needle 4 to offset the alignment of the needle hub 3 with), making it impossible to reuse the syringe.

If the user does not rotate the plunger 2 even if the user accidentally pushes the plunger so that the conical head 23 is engaged with the shoulder 36 of the needle hub 3, the user needs the latching device to rotate the plunger 2. By the action of the plunger 2 can be pulled to release with the needle hub (3).

Although a number of features and advantages of the present invention have been described, shapes, sizes, and arrangement of major components may be changed without departing from the spirit of the present invention.

As described above, according to the present invention, when the hollow barrel is pushed toward the needle hub, the engagement between the ratchet device and the inclined tooth attracts the needle hub and the needle inside the barrel together, and the plunger is pulled back so that a human You can prevent this stab.

Claims (3)

A barrel having a through hole formed in the axial direction and a retaining device formed inside the front end thereof; Plunger slidably received in the barrel and having a neck formed on its front end to fit a rubber seal, a conical head protruding from the neck, a plurality of spatially formed lingering teeth and a flange formed opposite the conical head. ; A conical front end having a plurality of bosses detachably engaged with the barrel and rotatably corresponding to the retaining device of the barrel, axially formed holes in communication with the through holes of the barrel, the holes and the barrel A needle having a receiving hole in communication with a through-hole of the plunger so that the conical head of the plunger is extendable, a plurality of recesses formed to receive the inclined tooth and a shoulder formed in the circumference of the receiving hole to correspond to the conical head of the plunger Herb; And A needle having a sleeve for tight engagement with the conical front head of the needle hub and a metal tube for tight engagement with the sleeve, And the boss is rotatably released from the clamp of the finger by engaging the inclined teeth and the recess. The method of claim 1, And the retaining device includes a plurality of L-shaped fingers configured to clamp the boss and a plurality of troughs configured to receive the boss. The method of claim 2, And an elastic push rod which is received on and contacts the inner circumference of the receiving hole of the needle hub and is formed on an end of the conical head.