KR101668683B1

KR101668683B1 - Disposable safety syringe

Info

Publication number: KR101668683B1
Application number: KR1020160041223A
Authority: KR
Inventors: 백우인
Original assignee: 백우인
Priority date: 2016-04-04
Filing date: 2016-04-04
Publication date: 2016-10-24

Abstract

The present invention relates to a disposable safety syringe in which a plunger is completely moved forward to be joined to a needle after an injection and then is moved backward to make the needle isolated in a cylinder, wherein the disposable safety syringe enables a normal usage as the plunger is not joined to the needle before an injection even when the plunger moves forward. According to the present invention, the disposable safety syringe includes: the cylinder (110); a joining tube (111) protruding from the front end of the cylinder; the plunger (120) inserted into the cylinder to move back and forth; a needle fixating tube (130) joined to the joining tube; an adaptor tube (140) which is inserted into the needle fixating tube to be moved back and forth and is engaged with the needle fixating tube when moving backward to draw the needle fixating tube into the cylinder; an elastic engaging part (150) protruding from the front end of the plunger to be engaged with the adaptor tube when the plunger moves forward; and an extension ring (160) provided in the elastic engaging part to restrict the forward movement of the plunger during compression and to allow the plunger to move forward by being extended when the plunger moves backward.

Description

[0001] Disposable safety syringe [0002]

The present invention relates to a disposable safety syringe for completely moving a plunger forward after a scan so as to be engaged with a plunger and then moving the plunger backward to isolate the plunger in a cylinder. Even if the plunger moves forward before the injection, To a disposable safety syringe which can be used normally.

In general, the syringe is composed of a cylinder and a needle inserted in the cylinder, an injection needle fixed to the front of the cylinder, and an injection needle coupled to the injection needle fixing tube. After use, the injection needle protection cap is placed on the injection needle and discarded.

Therefore, in the process of disposing of the syringe, there is a safety accident that the user's doctor or nurse or the waste syringe collection operator is stuck to the needle, which may expose him to a serious risk of infection with infectious pathogens.

In order to solve this problem, recently, a disposable safety syringe has been developed in which the needle is isolated in the cylinder. As shown in Figs. 1 and 2, The disposable safety syringe is inserted into a coupling tube (12) formed in a cylinder (11) by inserting a needle needle fixing tube (15). The flange 15a formed along the outer circumferential surface of the rear needle of the injection needle fixing tube 15 is caught by the stepped portion formed at the connection portion between the cylinder 11 and the coupling tube 12 to restrict forward movement. An O-ring 19 fitted in the inner circumferential surface of the coupling tube 12 maintains a gap between the coupling tube 12 and the needle needle fixing tube 15 in an air-tight state. Therefore, And does not leak to the outside through the gap between the needle fixing pipe (15) and the coupling tube (12).

The disposable safety syringe pulls back the plunger 13 in a state where the insertion of the injection needle 16 into the cylinder 11 is completed to fill the injection liquid into the cylinder 11 and pushes the plunger 13 forward, As shown in FIG. 3, when the plunger 13 is completely moved forwardly of the cylinder 11, the injection is completed and the engaging piece 13a formed on the front end of the plunger 13 is resiliently deformed Passes through the latching protrusion 15b of the needle fixing tube 15 and is inserted into the needle fixing tube 15 and is caught by the latching protrusion 15b.

When the plunger 13 is pulled backward in a state in which the plunger 13a is hooked on the engaging projection 15b, the plunger 13 moves backward while holding the needle needle fixing tube 15, The injection needle fixing tube 15 and the injection needle 16 are completely drawn into the cylinder 11, as shown in Fig.

When the cutting groove 18 formed in the pusher 13 comes close to the rear end of the cylinder 11, the pusher 13 is cut by applying a vertical force to the rear end of the pusher 13. The cutter 13 is inserted into the coupling tube 12 of the cylinder 11 and inserted into the cylinder 11 while bending the injection needle 16 located inside the cylinder 11.

Therefore, even if the cut throat 13 is withdrawn from the cylinder 11 again, it is not possible to pull the bent needle 16 out of the cylinder 11 through the coupling tube 12, Not only an accident that the needle 16 is stuck does not occur at all but even if the injection needle 16 is pulled out of the cylinder 11, since the injection needle 16 is already severely damaged, reuse is fundamentally impossible .

However, in order to prevent the inconvenience of the disposable safety syringe, the push rod 13 is inserted into the cylinder 11 and assembled as shown in FIG. 2. However, When the plunger 13 is moved forward, as shown in Fig. 3, the plunger 13 is caught by the plunger 15b formed at the front end of the plunger 13, which makes it impossible to use the plunger.

KR 10-1282209 B1

SUMMARY OF THE INVENTION It is an object of the present invention to provide a disposable safety syringe which can be used even if the plunger is completely moved forward before the injection due to carelessness during transportation or handling.

In order to achieve the above object, the disposable safety syringe of the present invention comprises a cylinder, a coupling tube protruded from the front end of the cylinder, a push rod inserted into the cylinder so as to be movable back and forth, An adapter tube which is inserted into the injection needle fixing tube so as to be movable forward and backward and is engaged with the injection needle fixing tube when moving backward to pull the injection needle fixing tube into the cylinder; And an elastic gripping portion provided on the elastic gripping portion to restrict forward movement of the pressing rod and allow the forward movement of the rod to be extended when the rod moves backward, And a ring.

In addition, an outward protrusion may be formed on the front end of the adapter tube, and an inward protrusion corresponding to the outward protrusion may be formed on the inner side of the injection needle fixing tube at the rear of the outward protrusion.

The elastic engaging portion includes a protrusion protruding forwardly from the front end of the push rod so as to penetrate the elastic ring, an elastic pulling ring protruding from the outer circumferential surface of the protrusion, a rear end of the elastic ring formed along the outer circumferential surface of the protrusion, And an inner circumferential surface of the adapter tube may be provided with a second step for engaging with the elastic pulling collar.

In this case, the second step has an inclined guide surface for guiding the entrance of the elastic pulling ring, and is formed so as to be inclined outward from the front to the rear so that the elastic pulling ring can be compressed during the movement along the inclined guide face And a first receiving groove for receiving the elastic pulling ring which is compressed on the outer peripheral surface of the projection is formed.

Further, the stretchable ring may have a cross section of 'C' shape with one side open.

In addition, it is preferable that a first seating surface on which the compressed stretchable ring is seated is formed on the inner circumferential surface of the cylinder.

In this case, both sides of the outer circumferential surface of the protrusion are further provided with an elastic pressing ring which is fitted in the elastic ring when the push rod is moved backward and applies a continuous external force in a direction in which the elastic ring is extended. In the front end of the elastic pressing ring, The protruding protrusions can be formed.

Meanwhile, the injection needle fixing tube may be composed of a main body in which a needle is fixed to the front end and an adapter tube is coupled to a rear end, and a first hub is detachably inserted into the coupling tube in a state of being coupled with the main body .

In this case, it is preferable that a second seating surface on which the compressed stretchable ring is seated is formed on the inner circumferential surface of the first hub.

In addition, a first seating surface on which the compressed stretchable ring is seated is formed on the inner circumferential surface of the coupling tube, and both sides of the outer circumferential surface of the protrusion are fitted to the stretchable ring when the pushrod moves backward, The elastic pressing ring may further include an elastic pressing ring for applying an external force to the front end of the elastic pressing ring.

In addition, an outward protrusion is formed on the front end of the adapter tube, and an inward protrusion corresponding to the outward protrusion is formed on the inner side of the main body of the injection needle fixing tube at the rear of the outward protrusion.

Meanwhile, the injection needle fixing tube may be composed of a main body to which the injection needle is fixed, and a second hub which is inserted into the coupling tube in a detachable manner at the rear end of the main body, and the adapter tube is coupled to the rear end .

In this case, it is preferable that an inner circumferential surface of the adapter tube is provided with a fourth seating surface on which a compressed stretchable ring is seated, and a fifth seating surface formed on the rear of the second seating surface and on which a stretchable ring having an expanded outer diameter is seated Do.

Further, on both sides of the outer circumferential surface of the projection, there is further provided an elastic pressing ring which is fitted in the elastic ring and applies a continuous external force in a direction in which the elastic ring is expanded when the rod moves backward, and the front end of the elastic pressing ring And the protruding protrusions can be formed.

Preferably, a second receiving groove for receiving the compressed elastic pressing ring is formed on the outer circumferential surface of the projection.

In this case, the elastic pressing ring is formed on the rear side of the elastic pulling ring and on the opposite side of the elastic pulling ring, and an auxiliary elastic pulling ring extending forward from the pulling protrusion is formed on the front end of the elastic pressing ring formed on the opposite side of the elastic pulling ring .

In addition, an outward projection may be formed on the front end of the adapter tube, and an inward projection corresponding to the outward projection may be formed on the inner side of the second hub of the injection needle fixing tube at the rear of the outward projection.

delete

In addition, a filter member positioned in front of the adapter tube and a filter gasket fitted to the front end of the filter member may be further provided in the injection needle holding tube.

In this case, it is preferable that a protruding step for restricting the backward movement of the filter member is formed in the injection needle fixing tube.

The filter gasket is elastically opened by an inner pressure of an injection needle fixing tube which is lowered when the pusher moves backward, and the injection gas injected into the injection needle fixing tube And a third step corresponding to the protrusion is formed on an inner circumferential surface of the injection needle fixing tube at an inner circumferential surface of the injection needle fixing tube, And a communication groove communicating with a gap between the filter gasket and the inner circumferential surface of the injection needle fixing tube is formed in the projection so that the filter member is prevented from being moved forward from the inside of the injection needle fixing tube, The inner circumferential surface is closed by the front end of the filter gasket A first groove portion is formed which is opened when the filter gasket is pushed forward due to the discharge pressure of the injection liquid discharged through the communication groove of the filter member to form the injection liquid discharge passage communicating the clearance with the front end of the injection needle fixing tube .

The filter member may include a body portion having a front opening and a rear opening formed to communicate with each other, and a filter attached to the rear opening to filter foreign substances contained in the injection liquid flowing into the interior of the injection needle through the rear opening .

In addition, the injection liquid inflow part may include a convergent part formed at the center of the front end of the filter gasket so as to be converged toward the center toward the rear and an incision formed at the center of the convergent part.

The filter member may include a front opening, a rear opening, a partition defining the front opening and the rear opening, a communication hole formed in the partition to communicate the front opening and the rear opening, and a communication hole communicating the front opening and the rear opening, A second groove formed at a front end of the body for communicating the outside of the body with the front opening; a second groove formed at the front end of the body for communicating the front opening with the rear opening; And a filter for filtering the foreign substances contained in the injected liquid.

In this case, the filter gasket may include a rear body movably inserted back and forth inside the front opening of the body portion of the filter member to be supported on the partition wall, and a rear gasket having a smaller outer diameter than the rear body and protruding forward from the rear body, And a front body that surrounds the front protrusion in a state where the center is penetrated and elastically deforms outwardly when the inner pressure rises, and is spaced from the front protrusion to form a liquid injection path.

The filter gasket may include a rear body movably inserted into the front opening of the body portion of the filter member and supported by the partition wall, a front body protruding forward from the rear body with an outer diameter smaller than that of the rear body, And an injecting part formed at the front end of the front body and elastically opened when the inner pressure rises.

In this case, it is preferable that the injecting liquid discharging portion comprises a converging portion formed at the center of the front end of the filter gasket so as to be converged toward the front toward the center and an incision formed at the center of the converging portion.

In addition, the front body may be tapered so that the inner diameter increases as the inner circumferential surface moves rearward.

In addition, a round support portion protruding forward may be formed on the front surface of the rear body.

The connection portion of the front body and the rear body may be provided with a contact protrusion for blocking a gap between the inner circumferential surface of the injection needle fixing tube and the connection portion.

In addition, the rear body of the filter gasket and the front body may be integrally formed, and the rear body may be an elastic material disc having a first through-hole passing through the front protrusion at the center thereof.

In this case, it is preferable that the inner circumferential surface of the first through-hole is tapered so that the inner diameter increases toward the rear so that the injected liquid can be easily discharged through the gap between the inner protrusion and the front protrusion.

In addition, the filter gasket may be an elastic material disc having a first through hole through which a front protrusion penetrates in the center.

Meanwhile, a third groove portion communicating the second groove portion and the adapter tube may be formed on the inner circumferential surface of the injection needle fixing tube.

According to the present invention, the filter member has a front opening, a rear opening, a partition defining the front opening and the rear opening, a communication hole formed in the partition to communicate the front opening and the rear opening, A front protrusion extending forward from the center of the partition so as to protrude outward; and a rear protrusion extending from a center of the partition to a rear opening; A filter attached to the rear opening so that the center thereof closely contacts with the rear protrusion so as to filter foreign substances contained in the injection liquid flowing into the cylinder through the rear opening; A second through hole penetrating the front projection and the rear projection in the front-rear direction; And a third through hole formed at the center of the filter so as to communicate with the second through hole of the body portion.

In this case, the filter gasket may include a rear body positioned inside the front opening of the body portion of the filter member and forming a fluid inflow gap with a front opening of the body portion of the filter member interposed therebetween, A front body protruding forward from the body to enclose the front protrusions and an injecting liquid discharging portion formed at the front end of the front body and elastically opened when the internal pressure rises.

A second inclined surface, which is in close contact with the first inclined surface when the body of the filter member moves backward, protrudes in the interior of the needle retention tube, and a first inclined surface is formed along the edge of the rear end of the filter member body. .

The injection port may be formed at the center of the front end of the filter gasket, and may be formed at the center of the convergent part.

The filter member has a body portion having a front opening and a rear opening communicated with each other and adapted to be movable forward and backward in the interior of the injection needle fixing tube and a body portion attached to the rear opening and being discharged to the injection needle through the rear opening, And a filter for filtering foreign substances contained in the filter; The filter gasket includes a rear body tightly coupled to the inside of the front opening of the body portion of the filter member, a front body protruding forward from the rear body, an injection liquid inflow hole formed at the rear end of the rear body, And an injecting liquid discharging unit which is elastically opened when the injection liquid flows into the injection liquid inflow hole and the inner pressure of the front body rises.

In this case, the inner circumferential surface of the injection needle fixing tube may be provided with a fourth groove portion for communicating the front portion of the body portion with the adapter tube only when the body portion of the filter member moves rearward.

Preferably, the front body has a separating portion spaced apart from the needle fixing tube, and a tight fitting portion formed behind the spacing portion and releasing the adhesion with the needle fixing tube only when the body portion of the filter member moves rearward Do.

The filter member has a body portion having a front opening and a rear opening communicated with each other and adapted to be movable forward and backward in the interior of the injection needle fixing tube and a body portion attached to the rear opening and being discharged to the injection needle through the rear opening, And a filter for filtering foreign substances contained in the filter; The filter gasket may include a rear body inserted into the front opening of the body portion of the filter member, and a front body protruding forward from the rear body and having an edge portion supported in close contact with the front end of the front opening.

In this case, the front body of the filter gasket has a shape converging toward the front toward the center. A hook is formed along the inner circumferential surface of the needle pin fixing tube to restrict the rear body of the filter gasket from being separated from the body of the filter member when the front body moves forward by a predetermined distance or more, Preferably, a communication groove is formed in a corner portion of the engaging jaw.

According to the present invention configured as described above, since the extension ring provided on the elastic engagement protrusion formed on the front end of the plunger prevents the plunger from moving forward before scanning, the plunger is moved forward It is possible to prevent the phenomenon that the normal use of the syringe becomes impossible due to the movement of the syringe while being coupled with the needle fixing tube.

In addition, according to the present invention, when the filter is further provided in the interior of the injection needle fixing tube, the filter moves back and forth according to the operation of the plunger, and different flow paths are formed depending on the difference in pressure generated when the injection liquid is introduced into or discharged from the cylinder. And the foreign substances including the pieces of ampoule contained in the injection solution are all filtered, thereby maximizing safety and convenience in use.

1 is an exploded perspective view showing an example of a general disposable safety syringe.
2 is an assembled sectional view of Fig.
3 and 4 are sectional views of a conventional disposable safety syringe in use;
5 is an exploded perspective view of the disposable safety syringe according to the first embodiment of the present invention.
6 is an assembled sectional view of Fig.
7 to 9 are sectional views of the disposable safety syringe according to the first embodiment of the present invention in use;
10 to 13 are sectional views of the disposable safety syringe according to the first embodiment of the present invention, in use, showing a state where the elastic pressing projection is further provided.
FIG. 14 is an exploded perspective view of a disposable safety syringe according to the first embodiment of the present invention, showing a state where a filter is provided. FIG.
FIG. 15 is an assembled sectional view of a disposable safety syringe according to the first embodiment of the present invention, showing a state in which a filter is provided. FIG.
16 is an exploded perspective view of the filter of Fig.
FIG. 17 is a cross-sectional view of a main part of a safety syringe according to the first embodiment of the present invention, showing a state in which an injection liquid flows into a cylinder through a needle. FIG.
FIG. 18 is a cross-sectional view showing a principal portion of a safety syringe according to the first embodiment of the present invention, in which the injected fluid filled in a cylinder is discharged through a filter into a needle. FIG.
19 is an assembled cross-sectional view of a safety syringe according to a first embodiment of the present invention, showing another embodiment of a gasket;
FIG. 20 is an assembled sectional view of a safety syringe according to a first embodiment of the present invention in which the gasket of FIG. 19 is installed; FIG.
21 is an assembled cross-sectional view of a safety syringe according to a first embodiment of the present invention, showing another embodiment of a filter.
22 is an exploded perspective view of the filter of Fig.
FIG. 23 is an assembled cross-sectional view of the safety syringe according to FIG. 21, showing a state in which an injection liquid flows into a cylinder through a needle. FIG.
Fig. 24 is an assembled cross-sectional view of the safety syringe according to Fig. 21, showing a state in which the injection liquid filled in the cylinder is discharged to the injection needle through the filter.
Fig. 25 is a view showing another embodiment of the gasket according to Fig. 21; Fig.
26 is an exploded perspective view of a disposable safety syringe according to a second embodiment of the present invention;
Fig. 27 is an assembled sectional view of Fig. 26; Fig.
28 to 30 are sectional views of the disposable safety syringe according to the second embodiment of the present invention in use;
31 is a sectional view of the disposable safety syringe according to the second embodiment of the present invention in a state in which the elastic pressing projection is provided.
Fig. 32 and Fig. 33 are views showing a state in which a filter is further provided as an engagement sectional view of Fig. 28; Fig.
34 is an exploded perspective view of the disposable safety syringe according to the third embodiment of the present invention.
35 is an assembled sectional view of Fig.
36 to 38 are sectional views of the disposable safety syringe according to the third embodiment of the present invention in use;
FIG. 39 is a sectional view of a disposable safety syringe according to a third embodiment of the present invention in use; FIG. 39 is a view showing a state where the elastic pressing projection is further provided.
40 is a sectional view of the disposable safety syringe according to the third embodiment of the present invention in a state in which an auxiliary elastic pulling ring is formed;
FIG. 41 and FIG. 42 are views showing a state in which a filter is further provided as an engagement sectional view of FIG. 36; FIG.

The features and advantages of the present invention will become more apparent from the following detailed description of preferred embodiments with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims are to be interpreted in accordance with the technical idea of the present invention based on the principle that the inventor can properly define the concept of the term in order to explain his invention in the best way. It must be interpreted in terms of meaning and concept.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. The same reference numerals are used for the same components, and only the different portions are described for the sake of clarity.

&Lt; Embodiment 1 >

5 and 6, the disposable safety syringe of the present invention comprises a cylinder 110, a coupling pipe 111 protruding from the front end of the cylinder 110, And a needle fixing tube 130 coupled to the coupling tube 111. The needle 120 is inserted into the insertion tube 111,

The injection needle fixing tube 130 is inserted into the rear end of the cylinder 110 and is fitted to the inner circumferential surface of the coupling tube 111. The adapter tube 140 is inserted and coupled to the inside of the injection needle fixing tube 130. A locking protrusion 111a is formed on an inner circumferential surface of the coupling tube 111 to block forward movement of the injection needle fixing tube 130.

The adapter tube 140 has an open front and rear side and is inserted into the injection needle fixing tube 130 so as to be movable back and forth. The adapter tube 140 is closely contacted with the inner circumferential surface of the injection needle fixing tube 130 so that the injection solution does not flow in or out through the gap with the injection needle fixing tube 130.

In addition, the adapter tube 140 is formed with an outward protrusion 141 along the outer circumferential surface of the front end so as to be engaged with the injection needle fixing tube 130 when moving backward. An inward protrusion 131 corresponding to the outward protrusion 141 is formed on the inner side of the injection needle fixing tube 130 at the rear of the outward protrusion 141.

On the other hand, an elastic catching part 150 is provided on the front end of the plunger 120. The elastic latching part 150 protrudes forward from the front end of the plunger 120 and selectively engages with the adapter tube 140 according to the degree of forward movement of the plunger 120. [

The elastic locking part 150 is provided with the expansion ring 160. The elastic ring 160 is provided on the elastic locking part 150 to selectively allow forward movement of the pressing rod depending on whether the elastic ring 160 is extended or contracted so that the elastic locking part 150 is selectively engaged with the adapter tube 140 do. That is, depending on the degree of forward movement of the plunger 120, the engagement between the elastic catching portion 150 and the adapter tube 140 may be different.

The resilient latching part 150 includes a protrusion 151 protruding forward from the front end of the plunger 120 so as to penetrate the elastic ring 160 and a resiliently protruding protrusion 151 formed on the outer circumferential surface of the protrusion 151 And a first step 153 which is formed along the outer circumferential surface of the protrusion 151 and interferes with the compressed expansion ring 160. The first step 153 blocks the pusher 120 from moving forward even if an external force is applied forward to the pusher 120 assembled in the cylinder 110 due to the circulation process or the careless handling before the injection.

The inner circumferential surface of the adapter tube 140 is provided with a second step 144, which is engaged with the elastic pulling ring 152. In this case, the second step 144 is formed to have an engagement surface 144a for engagement with the elastic pulling ring 152 and an inclination to the rearward inward direction from the engagement surface 144a to guide the entry of the elastic pulling ring 152 And has an inclined guide surface 144b. The elastic pulling ring 152 is formed to be inclined outward from the front to the rear so as to be compressed in the process of moving along the inclined guide surface 144b. In this case, it is preferable that a first receiving groove 154 for receiving the compressed elastic pulling ring 152 is formed on the outer circumferential surface of the projection 151.

On the other hand, the expansion and contraction ring 160 has a cross section of 'C' shape with one side opened to facilitate expansion and contraction. In addition, a groove 161 for smooth expansion and contraction may be formed on one side of the extensible ring 160. In addition, a first seating surface 112 is formed on the inner circumferential surface of the cylinder 110 in which the expansion ring 160 is compressed. The first seating surface 112 is smaller in diameter than the inner diameter of the cylinder 110. Accordingly, when the expansion ring 160 is detached from the first seating surface 112, the compressed state is released and the outer diameter is expanded.

The safety syringe according to the first embodiment of the present invention constructed as described above is used as follows.

6, in the initial state before use, the first step 153 formed on the projection 151 is interfered with the expansion ring 160, and the expansion ring 160 is brought into close contact with the rear end of the adapter tube 140 So that the plunger 120 is not moved forward. Therefore, even if an external force is applied to the plunger 120 due to carelessness during the distribution process or handling, the plunger 120 is not moved forward by the extensible ring 160 before the injection.

7, when the elastic band 120 is moved backward along the bar 120, the elastic ring 160 is moved to the back side of the elastic ring 160, As shown in FIG. As a result, the expansion ring 160 is pulled backward by the elastic pulling ring 152 and is released from the first seating surface 112. The extensible ring 160 detached from the first seating surface 112 is expanded in outer diameter while the compressed state is released.

8, the push rod 120 is moved forward to perform a scan. In this process, the extensible ring 160 having an expanded outer diameter is moved in a direction opposite to the inner diameter of the cylinder 110 It can not enter the first seating surface 112 having a small diameter and is positioned on the inner circumferential surface of the cylinder 110. In addition, in this state, the extensible ring 160 is in an expanded state, so that it does not interfere with the first step 153.

Accordingly, when the plunger 120 is moved forward in a state where the extensible ring 160 is seated on the inner circumferential surface of the cylinder 110, only the plunger 120 moves forward. When the pusher 120 is completely moved forward, the elastic pulling ring 152 passes completely through the second step 144 as the injection is completed.

9, when the injection needle is withdrawn from the patient after the injection is completed and the plunger 120 is moved backward, the elastic pulling ring 152 moves backward along the plunger 120, And the second step 144 formed on the inner circumferential surface of the first stepped portion 144a. As a result, the adapter tube 140 is retracted by the elastic pulling ring 152 and moved backward within the needle fixing tube 130. In this process, the outward protrusion 141 of the adapter tube 140 and the inward protrusion 131 of the injection needle fixing pipe 130 are interfered with each other and the injection needle fixing pipe 130 is moved backward by the adapter tube 140, And is drawn into the cylinder 110 through the coupling pipe 111.

As a result, the reuse of the syringe and the injection needle is fundamentally impossible, and the injection needle is not exposed to the outside, thereby preventing an accident that the injection needle is stuck in processing the used syringe.

When a cut groove (not shown) is formed in the plunger 120, when the cut groove approaches the rear end of the cylinder 110, the plunger 120 is severed by applying a vertical force to the back end of the plunger 120. As a result, the cut bar 120 can not be pulled out of the cylinder 110 again, so that the reusability of the syringe and the injection needle is inherently impossible. At the same time, the needles are not exposed to the outside, thereby preventing the needles from being stuck in the process of using the used syringes.

10 to 13, when the plunger 120 moves backward, the outer circumferential surface of the protrusion 151 is fitted to the extensible ring 160, so that the extensible ring 160 is extended in the direction in which the extensible ring 160 is extended. And a second receiving groove 156 for receiving the compressed elastic pressing ring 155 is formed on the outer circumferential surface of the protrusion 151. In this case,

In this case, on the front end of the elastic pressing ring 155, a pulling protrusion 155a which interferes with the front end of the stretching ring 160 is formed. In addition, a locking protrusion 113 is formed at the front end of the first seating surface 112 to block the expansion ring 160 from moving forward.

10, in the initial state before use, the first step 153 formed on the projection 151 is interfered with the expansion ring 160, and when the elastic compression ring 155 is further extended, The ring 160 is caught by the engaging jaw 113 and can not be moved forward, so that the plunger 120 is not moved forward. Therefore, even if an external force is applied forward to the plunger 120 due to carelessness during the distribution process or handling, the plunger 120 is not moved forward by the extensible ring 160, so that there is no problem in use.

When the pusher 120 is pulled backward to fill the injection liquid in the initial state as described above, the elastic pusher 155 moves backward along the pusher 120 as shown in FIG. 11, The elastic ring 160 is pulled back by the pulling protrusion 155a and is eventually disengaged from the first seating surface 112. In this case, The outer diameter of the extensible ring 160 detached from the first seating surface 112 is expanded as the compressed state is released and the state expanded by the external force transmitted from the elastic pressure ring 155 stably continues.

12, when filling of the injection liquid is completed, the pusher 120 is moved forward to perform the injection. After the injection is completed, the injection needle is withdrawn from the patient as shown in FIG. 13, and the pusher 120 . These processes are the same as the processes of FIGS. 8 and 9, respectively, and thus a detailed description thereof will be omitted.

14 to 16, a filter F positioned in front of the adapter tube 140 for filtering foreign substances contained in the injection liquid may be further provided in the needle holder fixing tube 130 have.

In this case, the filter F is largely composed of the body portion 170, the filter plate 180, and the gasket 190.

The body portion 170 has a rear opening 171 and is fitted with sufficient space to be movable back and forth inside the injection needle fixing tube 130. That is, the outer diameter of the body portion 170 is designed to be smaller than the inner diameter of the injection needle fixing tube 130 so that the injection liquid flows into the cylinder 110 between the outer diameter surface of the body portion 170 and the injection needle fixing tube 130 To form a clearance.

A protrusion 172 protruding forward is provided at the center of the body portion 170.

The filter plate 180 is attached to the rear opening 171 of the body portion 170 to filter out foreign substances contained in the injection liquid discharged from the cylinder 110 through the rear opening 171.

The gasket 190 is a member having excellent elasticity such as rubber and is positioned in close contact with the front of the body portion 170. The outer diameter of the gasket 190 is designed to be smaller than the inner diameter of the injection needle fixing tube 130 so that a clearance is formed between the gasket 190 and the injection needle fixing tube 130 so that the injection liquid can be introduced into the cylinder 110 .

The gasket 190 is opened by the internal pressure rising when the injection liquid flows into the inside of the body portion 170. To this end, the gasket 190 has a front end 191 which closely surrounds the outer surface of the projection 172. The body portion 170 has a first through hole 173 for communicating the inside of the gasket 190 with the filter plate 180.

On the other hand, the inner circumferential surface of the front end portion 191 of the gasket 190 is preferably provided with an injection liquid discharge groove 192 in the forward and backward directions. The injection liquid discharge groove 192 guides the injection liquid flowing into the body portion 170 through the filter plate 180 to the front end portion 191 of the gasket 190 so that the gasket 190 Is concentrated to the front end portion 191, so that the gasket 190 can be easily opened.

Further, it is preferable that the gasket 190 has a front end portion 191 having a dividing end face 193 formed in the front-back direction. In this case, the front end portion 191 of the gasket 190 can be easily opened while easily being elastically deformed outwardly even with a small internal pressure.

According to the present invention, the injection needle fixing pipe 130 has a first inner diameter surface 130a in which the body portion 170 of the filter F is positioned, and a second inner diameter surface 130b having a diameter smaller than that of the first inner diameter surface 130a, And a second inner diameter surface 130b in which the front end 191 of the inner diameter surface 191 is located. The gasket 190 has a latching protrusion 194 which closely contacts the step 130c forming the boundary between the first inner diameter surface 130a and the second inner diameter surface 130b. Therefore, when the gasket 190 is moved forward, the stopping jaw 194 is brought into close contact with the step 130c, and movement of the gasket 190 forward is further restricted.

The outer surface of the front end portion 191 of the gasket 190 is closely adhered to the injection needle fixing tube 130 when the injection liquid is discharged from the cylinder 110 and the gap between the gasket 190 and the needle needle fixing tube 130 So that the injection liquid does not flow out.

In this case, the outer surface of the front end 191 of the gasket 190 may have a first inclined surface 195 formed to have a larger outer diameter toward the rear, or may have a second inner surface 130b And a second inclined surface 130d formed to have a larger inner diameter toward the rear.

The front end of the adapter tube 140 and the rear end of the filter F are closely attached to the front end of the adapter tube 140 and are provided with spacing protrusions 142 to prevent the inflow path of the injection liquid into the cylinder 110 from being blocked. Is further formed.

A syringe having the filter of the present invention thus configured is used as follows.

First, when the user breaks the top of the ampoule containing the injection liquid and opens the ampoule, and retracts the plunger 120 after drawing the injection needle into the opened portion, as shown in Fig. 17, when the plunger 120 moves backward The filter F is moved backward by the internal pressure of the needle pin fixing tube 130 which is lowered.

When the filter F moves backward, a gap is formed between the step 130c of the needle staple tube 130 and the latching jaw 194 of the gasket 190. As a result, the injected liquid inside the ampoule including foreign matter including minute pieces of ampoule flows smoothly into the inside of the cylinder 110 through the gap between the filter F and the injection needle fixing tube 130.

When the injection of the injection liquid into the cylinder 110 is completed and the back movement of the plunger 120 is stopped, the negative pressure acting on the inside of the injection needle fixing tube 130 is released and the injection liquid is further introduced into the cylinder 110 Or more.

18, when the push rod 120 advances for scanning, the injection liquid inside the cylinder 110 passes through the filter plate 180 and passes through the first through hole 173 formed in the body portion 170 To the inside of the gasket (190). As the filter F is pushed forward due to the inflow pressure of the injection liquid, the latching jaw 194 of the gasket 190 and the step 130c of the injection needle fixing tube 130 closely contact each other. As a result, the injection liquid can not be discharged to the injection needle side through the gap between the gasket 190 and the injection needle fixing tube 130.

The outer surface of the front end 191 of the gasket 190 may have a first inclined surface 195 or the second inner surface 130b of the injection needle fixing tube 130 may have a second inclined surface 130d. The outer surface of the front end portion 191 of the gasket 190 and the injection needle fixing pipe 130 are closely adhered to each other by the inflow pressure of the injection liquid acting inside the gasket 190, The injected liquid does not flow out into the gap of the liquid-receiving portion 130. Therefore, it is possible to reliably prevent accidental leakage of the liquid including foreign matter including the pieces of ampule through the gap between the gasket 190 and the injection needle fixing pipe 130 without passing through the filter plate 180.

The outer surface of the front end portion 191 of the gasket 190 may have a first inclined surface 195 or the second inner surface 130b of the injection needle fixing tube 130 may have a second inclined surface 130d. Even if a clearance is generated between the outer diameter surface of the gasket 190 and the second inner diameter surface 130b of the injection needle fixing tube 130 due to manufacturing errors, the filter F moves forward, Since it is removed naturally, there is no accident that the injected liquid including foreign matter including the pieces of ampoule does not flow out to the needle side.

On the other hand, the front end 191 of the gasket 190 is elastically deformed outward due to the inflow pressure of the injection liquid while the inner pressure rises. When the front end portion 191 of the gasket 190 is elastically deformed, a gap is formed between the front end portion 191 and the protrusion 172 of the body portion 170 and the injection liquid is discharged through this gap.

Therefore, the foreign matters including the pieces of ampoule contained in the injection liquid are all filtered by the filter plate 180 so that only the clean injected liquid containing no foreign substances is discharged to the injection needle side.

19 and 20, the gasket 190 may be configured to extend the rear end of the gasket 190 to the outside of the body portion 170 to surround the body portion 170. In this case, it is preferable that the injection liquid inlet groove 196 is formed in the front-rear direction on the outer surface of the gasket 190 so that the injection liquid can smoothly flow into the cylinder 110 side. When the injection liquid inflow groove 196 is formed, the flow path of the injection liquid is ensured without forming a gap between the filter F and the first inner diameter surface 130a. Therefore, the first inner diameter surface 130a of the injection needle fixing tube 130 The outer diameter of the gasket 190 can be increased. In this case, the filter F is not allowed to flow in the needle fixing tube 130 but can be moved back and forth in a more stable state, thereby improving the operation reliability. When the injection liquid inflow groove 196 is formed, the flow path of the injection liquid passing through the gap between the filter F and the injection needle fixing tube 130 is expanded, so that the injection liquid can flow into the cylinder 110 very smoothly.

21 and 22, the body portion 170 has a second through hole 174 passing through the center of the projection 172 in the forward and rearward directions, and the gasket 190 is connected to the front end portion 191 And a cap 197 for opening and closing the second through hole 174. In this case, the first through hole 173 formed in the body portion 170 is excluded.

First, when the user breaks the top of the ampoule containing the injection liquid and opens the ampoule, the pusher 120 is retracted after pulling the injection needle into the opened portion, as shown in FIG. 23, when the pusher 120 moves backward The filter F is moved backward by the internal pressure of the needle pin fixing tube 130 which is lowered.

When the filter F moves backward, the step 130c forming the boundary between the first inner diameter surface 130a and the second inner diameter surface 130b of the injection needle fixing tube 130 and the engagement jaw 194 of the gasket 190, A gap is formed. As a result, the injected liquid inside the ampoule including foreign matter including minute pieces of ampoule flows smoothly into the inside of the cylinder 110 through the gap between the filter F and the injection needle fixing tube 130.

Then, as shown in FIG. 24, when the pusher 120 advances for the purpose of injection, the injection liquid in the cylinder 110 passes through the filter plate 180 And flows into the body portion 170.

When the injection liquid flows into the body portion 170, the filter F is pushed forward due to the inflow pressure of the injection liquid, and the engagement protrusion 194 of the gasket 190 and the protrusion 130c of the injection needle fixing tube 130 ) Are closely adhered to each other. As a result, the injection liquid can not be discharged to the injection needle side through the gap between the gasket 190 and the injection needle fixing tube 130.

The injection liquid introduced into the body 170 enters the second through hole 174 formed at the center of the projection 172 and the cap 197 provided at the front end 191 of the gasket 190 The cap 197 is elastically deformed outward. As a result, the second through-hole 174 is discharged with the second through-hole 174 opened and opened.

25, the gasket 190 may be configured to extend the rear end of the gasket 190 to the outside of the body 170 to enclose the body 170. As shown in FIG. In this case, it is preferable that the injection liquid inlet groove 196 is formed in the front-rear direction on the outer surface of the gasket 190 so that the injection liquid can smoothly flow into the cylinder 110 side. When the injection liquid inlet groove 196 is formed, the flow path of the injection liquid between the filter F and the injection needle fixing tube 130 is expanded, so that the injection liquid can flow into the cylinder 110 very smoothly.

&Lt; Embodiment 2 >

26 and 27, the injection needle fixing tube 230 according to the present embodiment includes a main body 231 having the injection needle fixed to the front end and the adapter tube 140 coupled to the rear end, And a first hub 232 detachably fitted to the inside of the coupling tube 111 in a state of being coupled to the coupling tube 111. [ On the inner circumferential surface of the first hub 232, a locking protrusion 232a for blocking forward movement of the main body 231 is formed.

A second seating surface 232b is formed on the inner circumferential surface of the first hub 232, on which the compressed and contractible ring 160 is seated. In addition, a third seating surface 232c, which is larger than the diameter of the second seating surface 232b, is formed on the rear side of the second seating surface 232b so that the extended telescopic ring 160 is seated. The third seating surface 232c in this embodiment is the inner peripheral surface of the coupling pipe 111. [

In addition, the adapter tube 140 is formed with an outward protrusion 141 along the outer circumferential surface of the front end so as to be engaged with the main body 231 when moving backward. An inward protrusion 231a corresponding to the outward protrusion 141 is formed on the inner side of the main body 231 at the rear of the outward protrusion 141.

The injector needle fixing tube 230 having the above structure is inserted into the cylinder 110 in such a manner that the coupling tube 111 is inserted into the rear end of the first hub 232 in a state in which the main body 231 is inserted into the first hub 232, Respectively.

In this case, the coupling pipe 111 may further include an auxiliary coupling pipe 111c surrounding the coupling pipe 111 for a strong coupling with the first hub 232. In this case, a female screw portion 111d is formed on the inner circumferential surface of the auxiliary coupling pipe 111c so that the coupling pipe 111 and the first hub 232 can be firmly coupled to each other, And a protruding protrusion 232d fastened to the female threaded portion 111d.

The constructions of the adapter tube 140, the elastic catching part 150, and the stretching ring 160 are substantially the same as those of the first embodiment, and a detailed description thereof will be omitted.

The safety syringe according to this embodiment thus configured is used as follows.

The first step 153 formed on the projection 151 is interfered with the rear end of the expansion ring 160 and the front end of the expansion ring 160 is inserted into the second mounting face 232b so that the plunger 120 is not moved forward. Therefore, since the push rod 120 is not moved forward by the stretching ring 160 before the scan, no external force is applied to the push rod 120 even if an external force is applied to the push rod 120 due to carelessness during the distribution process or handling.

28, when the pusher 120 is pulled backward to fill the injection liquid in the initial state, the elastic pulling ring 152 moves backward along the pusher 120, As shown in FIG. As a result, the extensible ring 160 is pulled rearward by the elastic pulling ring 152 and is released from the second seating surface 232b and positioned on the third seating surface 232c. In this process, the expansion ring 160 is released from its compressed state and its outer diameter is expanded.

When the filling of the injection liquid is completed, as shown in FIG. 29, the pusher 120 is moved forward to perform the scan. In this process, the extensible ring 160 having an expanded outer diameter, And can not enter the second seating surface 232b having a smaller diameter and is positioned on the inner circumferential surface of the coupling pipe 111. In addition, in this state, since the extensible ring 160 is in an expanded state, no interference occurs between the first step 153 and the extensible ring 160.

Accordingly, when the plunger 120 is moved forward in a state where the extensible ring 160 is seated on the inner circumferential surface of the coupling tube 111, only the plunger 120 moves forward. The elastic pulling ring 152 is gradually compressed as it moves along the inclined guide surface 144b and is accommodated in the first receiving groove 154 of the protrusion 151. When the pushing rod 120 is completely moved forward, The elastic pulling ring 152 is completely released from the inclined slope 144b and is seated on the latching surface 144a.

30, when the injection needle is withdrawn from the patient and the pusher 120 is moved backward after the injection is completed, the elastic pulling ring 152 moves backward along the pusher 120, And the second step 144 formed on the inner circumferential surface of the first stepped portion 144a. As a result, the adapter tube 140 is moved backward from the inside of the main body 231 of the injection needle fixing tube 230 while being pulled by the elastic pulling ring 152. The outward protrusion 141 of the adapter tube 140 and the inward protrusion 231a of the main body 231 of the injection needle fixing tube 230 interfere with each other and the injection needle fixing tube 230 is drawn by the adapter tube 140, And eventually flows out of the coupling pipe 111 and into the cylinder 110.

31, the outer circumferential surface of the protrusion 151 is inserted into the outer circumferential surface of the extension ring 160 when the push rod 120 moves backward, And a pushing protrusion 155a may be further formed at the front end of the elastic pushing ring 155 to interfere with the front end of the extensible ring 160. [

In this case, the first seating surface 111e, which is seated in a compressed state, is formed on the inner circumferential surface of the coupling pipe 111, and the rest of the structure and action are the same as those of the first embodiment The detailed description thereof will be omitted here.

32 and 33, a filter F positioned in front of the adapter tube 140 may be further provided in the main body 231 of the injection needle fixing tube 230. The filter F differs from the first embodiment only in the installation position, and the rest of the configuration and functions are all the same, so a detailed description thereof will be omitted.

&Lt; Third Embodiment >

34 and 35, the injection needle fixing tube 330 in the present embodiment includes a main body 331 to which the injection needle is fixed, and a main body 331 which is detachably coupled to the rear end of the main body 331, And a second hub 332 fitted into the coupling tube 111 and coupled to the adapter tube 140 at a rear end thereof.

The second hub 332 is inserted into the rear end of the cylinder 110 and is fitted to the inner circumferential surface of the coupling tube 111 and the adapter tube 140 is inserted and coupled to the inner side.

A hooking step 111g is formed on the inner circumferential surface of the coupling tube 111 to block forward movement of the injection needle fixing tube 330.

The adapter tube (140) has an open front and rear, and is inserted into the rear end of the second hub (332) so as to be movable back and forth. The adapter tube 140 is tightly adhered to the inner circumferential surface of the second hub 332 to prevent the injection liquid from flowing into or out of the second hub 332 through the gap.

In addition, the adapter tube 140 is formed with an outward protrusion 141 along the outer peripheral surface of the front end so as to be engaged with the second hub 332 when moving backward. An inward protrusion 333 corresponding to the outward protrusion 141 is formed on the inner side of the second hub 332 at the rear of the outward protrusion 141.

On the other hand, an elastic catching part 150 is provided on the front end of the plunger 120. Since the elastic latching part 150 is substantially identical to the elastic latching part 150 of the first embodiment, a detailed description thereof will be omitted.

The elastic locking part 150 is provided with the expansion ring 160. The elastic ring 160 is identical to the elastic ring 160 of the first embodiment except that the elastic ring 160 is inserted into the rear end of the adapter tube 140, so that a detailed description thereof will be omitted.

The fourth seat surface 145 on which the compressed expansion ring 160 is seated and the fifth seat on which the expansion ring 160 extended from the fourth seating surface 145 are seated is disposed at the rear end of the adapter pipe 140. A surface 146 is formed. The fifth seating surface 146 is formed behind the fourth seating surface 145 and is larger in diameter than the fourth seating surface 145. Accordingly, when the extensible ring 160 is detached from the fourth seating surface 145 and seated on the fifth seating surface 146, the compressed state is released and the outer diameter is expanded.

A second step 144 is formed on the inner circumferential surface of the adapter tube 140 and formed at the front of the fourth seating surface 145 to engage with the elastic pulling ring 152 of the elastic hooking part 150. In this case, the second step 144 is formed to have an engagement surface 144a for engagement with the elastic pulling ring 152 and an inclination to the rearward inward direction from the engagement surface 144a to guide the entry of the elastic pulling ring 152 And has an inclined guide surface 144b.

It is preferable that an insertion protrusion 157 inserted into the second hub 332 is formed at the front end of the protrusion 151 of the elastic locking part 150. In this case, the insertion protrusion 157 discharges all of the remaining injection liquid in the second hub 332 during the injection so that a predetermined amount of the injection liquid can be injected.

The safety syringe of the present invention thus configured is used as follows.

35, the first step 153 formed on the projection 151 is interfered with the rear end of the expansion ring 160 and the front end of the expansion ring 160 is inserted into the adapter pipe 140 in the initial state before use, The push rod 120 does not move forward because it is seated in the compressed state on the fourth seating surface 145 of the push rod 120. [ Therefore, since the push rod 120 is not moved forward by the stretching ring 160 before the scan, no external force is applied to the push rod 120 even if an external force is applied to the push rod 120 due to carelessness during the distribution process or handling.

When the pusher 120 is pulled backward to fill the injection liquid in the initial state as described above, the elastic pulling ring 152 moves backward along the pusher 120, as shown in FIG. 36, As shown in FIG. As a result, the extensible ring 160 is pulled backward by the elastic pulling ring 152 and disengaged from the adapter tube 140. In this process, the expansion ring 160, which has been separated from the fourth seating surface 145 of the adapter tube 140, is expanded in its outer diameter while the compression state is released.

37, the push rod 120 is moved forward to perform the scan. In this process, the extensible ring 160 having the outer diameter expanded is inserted into the fourth seating surface 145, And is seated on the fifth seating surface 146. In addition, in this state, since the extensible ring 160 is in an expanded state, no interference occurs between the first step 153 and the extensible ring 160.

Therefore, when the push rod 120 is moved forward after the extensible ring 160 is seated on the fifth seating face 146, only the push rod 120 is moved forward. The elastic pulling ring 152 is gradually compressed while moving along the inclined guide surface 144b of the second step 144 and accommodated in the first receiving groove 154 of the protrusion 151, Is completely moved forward, and when the scanning is completed, it passes completely through the inclined slope 144b of the second step 144, is released from compression, and is returned to the original state and is seated on the engaging surface 144a.

When the insertion protrusion 157 is formed on the front end of the protrusion 151 of the elastic locking part 150, when the push rod 120 is completely moved forward, the insertion protrusion 157 is inserted into the interior of the injection needle fixing pipe 330 So that the remaining injection liquid is discharged to the inside of the injection needle fixing tube 330, so that a predetermined amount of the injection liquid can be administered to the patient.

38, when the injection needle is withdrawn from the patient after the injection is completed and the plunger 120 is moved backward, the elastic pulling ring 152 moves backward along the plunger 120, The adapter tube 140 is retracted by the resilient pulling ring 152 and is moved backward in the interior of the injection needle fixing tube 330 . In this process, the outward protrusion 141 of the adapter tube 140 and the inward protrusion 333 of the injection needle fixing pipe 330 interfere with each other and the injection needle fixing pipe 330 is moved backward by the adapter tube 140, And is drawn into the cylinder 110 through the coupling pipe 111.

In this way, reuse of the syringe and the injection needle is fundamentally impossible, and the injection needle is not exposed to the outside, thereby preventing an accident that the injection needle is stuck in processing the used syringe.

39, when the push rod 120 moves backward, the protrusion 151 is fitted to the outer circumferential surface of the protrusion 151, and the elasticity of the elastic ring 160, which applies a constant external force in a direction in which the expandable ring 160 is extended, And a pushing protrusion 155a may be further formed at the front end of the elastic pushing ring 155 to interfere with the front end of the extensible ring 160. [

The elastic pressing ring 155 is operated to pull the stretching ring 160 in a state in which it is seated on the fourth seating surface 145 formed on the inner circumferential surface of the adapter tube 140, Since the mounting position differs from that of the embodiment only in the same way, detailed description thereof will be omitted.

Since the thickness of the protrusion 151 on the side of the elastic pulling ring 152 is relatively thin due to the first receiving groove 154, the pusher 120 is moved backward to draw the injection liquid into the cylinder 110 The front end of the protrusion 151 may be bent or tilted toward the elastic pulling collar 152 side. This phenomenon is further exacerbated when the insertion protrusion 157 is formed on the front end of the projection 151. [

In this case, the front end of the protrusion 151 inclined toward the elastic pulling ring 152 or the insertion protrusion 157 interferes with the second step 144 when the pusher 120 is advanced again, so that smooth entry is not achieved .

40, the elastic pressure ring 155 is formed on the rear side of the elastic pulling ring 152 and on the opposite side of the elastic pulling ring 152, and at the same time, It is preferable that an auxiliary elastic pulling ring 158 extending forward from the pulling protrusion 155a is formed at the front end of the elastic pressing ring 155 formed on the opposite rear side.

In this case, since the second receiving groove 156 formed on the opposite side of the elastic pulling ring 152 extends to the auxiliary elastic pulling ring 158 and the protrusion 151 has a certain thickness in the left and right direction, Or the insertion protrusion 157 is not inclined toward the elastic pulling ring 152 side. In addition, the pulling of the adapter tube 140 is more reliably performed through the elastic pressing ring 155 formed on both sides of the projection 151 and the auxiliary elastic pulling ring 158.

41 and 42, a filter F positioned in front of the adapter tube 140 may be further provided in the injection needle fixing tube 330. [

The configuration and operation of the filter F differ only in the installation position as compared with the first embodiment, and the rest of the configuration and functions are largely the same, so a detailed description thereof will be omitted.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be takeners of ordinary skill in the art, And such variations are within the scope of the present invention.

110 ... cylinder 111 ... coupling pipe
111e, 112 ... first seating surface 120 ... stick
130, 230, 330, ..., an injection needle fixing pipe 131, 231a, 333,
140 ... Adapter tube 141 ... Outward projection
144 ... second stage 144b ... inclined guide surface
145 ... fourth seating surface 146 ... fifth seating surface
150 ... elastic catching portion 151 ... projection
152 ... elastic pulling ring 153 ... 1st step
154 ... first receiving groove 155 ... elastic pressing ring
155a ... Traction projection 156 ... Second receiving groove
157 ... insertion projection 158 ... auxiliary elastic pulling ring
160 ... extensible ring 170 ... body portion
171 ... rear opening 172 ... projection
173 ... first through hole 174 ... second through hole
180 ... filter plate 190 ... gasket
191 ... front end portion 192 ... injection liquid outlet groove
193 ... divided section 195 ... first inclined surface
196 ... Syringe inflow groove 197 ... cap
231, 331 ... Main body 232 ... First hub
232b ... second seating surface 232c ... third seating surface
332 ... second hub A ... crevice
B ... spacing space F ... filter

Claims

cylinder;
A coupling pipe protruding from a front end of the cylinder;
A rod fitted in the cylinder so as to be movable back and forth;
An injection needle fixing tube coupled to the coupling tube;
An adapter tube inserted into the injection needle fixing tube so as to be movable forward and backward and pulling the injection needle fixing tube into the cylinder while being engaged with the injection needle fixing tube when moving backward;
An elastic engaging portion protruding from the front end of the plunger and engaged with the adapter tube when the plunger is moved forward; And
And an elastic ring provided on the resilient latching part to restrict forward movement of the pressing rod and permit forward movement of the pushing rod when the pushing rod moves backward.

The method according to claim 1,
An outward projection is formed on the front end of the adapter tube,
And an inward protrusion corresponding to the outward protrusion is formed on an inner side of the needle pin fixing tube at the rear of the outward protrusion.

The method according to claim 1,
The elastic engaging portion includes a protrusion protruding forward from the front end of the push rod so as to pass through the elastic ring, an elastic pulling ring protruding from the outer circumferential surface of the protrusion, and an elastic pulling ring formed along the outer circumferential surface of the protrusion, The first step being a first step;
And an inner circumferential surface of the adapter tube is provided with a second step for engaging with the elastic pulling ring.

The method of claim 3,
The second step has an inclined guide surface for guiding the entry of the elastic pulling ring,
The elastic pulling ring is formed so as to be inclined outward from the front to the rear so as to be compressed in the process of moving along the inclined guide surface,
And a first receiving groove for receiving the compressed elastic pulling ring is formed on an outer circumferential surface of the protrusion.

The method according to claim 1,
Wherein the expandable ring has a cross section of 'C' shape with one side open.

The method according to claim 1,
Wherein a first seat surface on which a compressed stretch ring is seated is formed on an inner circumferential surface of the cylinder.

The method of claim 3,
The elastic pressing ring is fitted to both sides of the outer circumferential surface of the protrusion so as to apply a constant external force in a direction in which the elastic ring is extended when the push rod moves backward,
Wherein a forward projection of the elastic pressing ring is further formed on the front end of the elastic pressing ring to interfere with the front end of the expansion ring.

The method according to claim 1,
Wherein the injection needle fixing tube is composed of a main body in which a needle is fixed to a front end and an adapter tube is coupled to a rear end thereof and a first hub which is detachably fitted to the inside of the coupling tube in a state of being coupled with the main body. Safety syringe.

9. The method of claim 8,
Wherein a second seat surface on which a compressed stretch ring is seated is formed on an inner circumferential surface of the first hub.

9. The method of claim 8,
The elastic engaging portion includes a protrusion protruding forward from the front end of the push rod so as to pass through the elastic ring, an elastic pulling ring protruding from the outer circumferential surface of the protrusion, and an elastic pulling ring formed along the outer circumferential surface of the protrusion, The first step being a first step;
And an inner circumferential surface of the adapter tube is provided with a second step for engaging with the elastic pulling ring;
The elastic pressing ring is fitted to both sides of the outer circumferential surface of the protrusion so as to apply a constant external force in a direction in which the elastic ring is extended when the push rod moves backward;
Wherein a forward projection of the elastic pressing ring is further formed on the front end of the elastic pressing ring to interfere with the front end of the expansion ring.

9. The method of claim 8,
An outward projection is formed on the front end of the adapter tube,
And an inward projection corresponding to the outward projection is formed on an inner side of the main body of the injection needle fixing tube at the rear of the outwardly projecting projection.

The method according to claim 1,
Wherein the injection needle fixing tube is composed of a main body to which the injection needle is fixed and a second hub which is inserted into the coupling tube in a detachable manner at the rear end of the main body and to which the adapter tube is coupled to the rear end, Safety syringe.

13. The method of claim 12,
And a fifth seating surface formed on an inner circumferential surface of the adapter tube, the fourth seating surface having a compressed stretchable ring seated thereon, and a fifth seating surface formed on the rear of the fourth seating surface to seat the stretchable ring having an expanded outer diameter. Safety syringe.

13. The method of claim 12,
The elastic engaging portion includes a protrusion protruding forward from the front end of the push rod so as to pass through the elastic ring, an elastic pulling ring protruding from the outer circumferential surface of the protrusion, and an elastic pulling ring formed along the outer circumferential surface of the protrusion, The first step being a first step;
And an inner circumferential surface of the adapter tube is provided with a second step for engaging with the elastic pulling ring;
The elastic pressing ring is fitted to both sides of the outer circumferential surface of the protrusion so as to apply a constant external force in a direction in which the elastic ring is extended when the push rod moves backward,
Wherein a forward projection of the elastic pressing ring is further formed on the front end of the elastic pressing ring to interfere with the front end of the expansion ring.

15. The method according to any one of claims 7 to 13,
And a second receiving groove for receiving the compressed elastic pressing ring is formed on the outer circumferential surface of the protrusion.

16. The method of claim 15,
The elastic pressing ring is formed on the rear side of the elastic pulling ring and on the opposite side of the elastic pulling ring,
Characterized in that the front end of the elastic pressing ring formed on the opposite side of the elastic pulling ring is provided with an auxiliary elastic pulling ring extending forward from the pulling protrusion.

13. The method of claim 12,
An outward projection is formed on the front end of the adapter tube,
And an inward projection corresponding to the outwardly projecting portion is formed on the inner side of the second hub of the needle pin fixing tube at the rear of the outwardly projecting portion.

13. The method of claim 12,
And an insertion protrusion inserted into the injection needle fixing tube is further formed at the front end of the protrusion of the elastic locking portion.

delete

The method according to claim 1,
Wherein the injector safety tube further comprises a filter disposed inside the needle tube fixing tube and disposed in front of the adapter tube for filtering foreign substances contained in the injection solution.

21. The method of claim 20,
The filter
A body portion having a rear opening and fitted in the inside of the injection needle fixing tube so as to be movable forward and backward;
A filter plate attached to a rear opening of the body portion to filter foreign matters contained in the injection solution; And
And a gasket which is positioned in close contact with the front of the body part and is opened by an internal pressure rising when the injection liquid flows into the body part, thereby providing the injection liquid discharge flow path.

22. The method of claim 21,
A protrusion protruding forward is formed at the center of the body part,
Wherein the gasket has a front end portion that closely surrounds the outer diameter surface of the projection,
And a first through hole communicating with the inside of the gasket is formed in the body part.

23. The method of claim 22,
And an injection liquid discharge groove is formed in the front-rear direction on the inner diameter surface of the front end portion of the gasket.

23. The method of claim 22,
Wherein a front end portion of the gasket has a dividing section formed in a front-back direction.

22. The method of claim 21,
Wherein a clearance is formed between the body portion and the injection needle fixing tube and between the gasket and the injection needle fixing tube so that the injection liquid can be introduced into the cylinder.

22. The method of claim 21,
A protrusion protruding forward is formed at the center of the body part,
Wherein the gasket has a front end portion that closely surrounds the outer diameter surface of the projection,
A second through hole is formed at the center of the body so as to pass through the center of the projection,
And a cap for opening and closing the second through hole is provided at the front end of the gasket.

27. The method of claim 22 or 26,
Wherein the gasket surrounds the body portion,
And an injection liquid inflow groove is formed in the front-rear direction on the outer surface of the gasket.

27. The method of claim 22 or 26,
Wherein the injection needle fixing tube has a first inner diameter surface having a body portion of the filter and a second inner diameter surface having a smaller diameter than the first inner diameter surface and having a front end portion of the gasket, Wherein the outer diameter surface of the portion is in close contact with the second inner diameter surface to prevent the injection liquid from flowing out through the gap between the front end portion and the injection needle fixing tube.

22. The method of claim 21,
Wherein a front end portion of the gasket is formed so that its outer diameter becomes larger toward the rear side.

29. The method of claim 28,
And a second inner diameter surface of the injection needle fixing tube is formed so as to have an inner diameter larger toward the rear side.

21. The method of claim 20,
Wherein a separating protrusion is formed at the front end of the adapter tube to prevent the front end of the adapter and the rear end of the filter from coming into close contact with each other.