KR100566568B1 - disposable safety syringe - Google Patents

Abstract

The present invention relates to a disposable safety syringe, the coupling portion of the needle fixing tube using the adapter tube and the fitting tube of the intermediate member without using a deformable sensitive O-ring when coupling the needle fixed tube fixed needle to the cylinder The seal is perfected.

To this end, the present invention is provided with a cylinder portion 101 having a space therein and communicated in a state where the front side at one end and the rear side at the other end are opened, and the space portion in the cylinder is forward along the longitudinal direction of the cylinder 101. The push rod 103 is fitted to be selectively moved to the side and the rear, and the front circumferential portion of the push rod provides a compressive force while moving together in the airtight contact state with the cylinder 101 during the front and rear movement of the push rod 103. Or the piston 104 is coupled to provide a suction force, the adapter tube 105 in the state of being in communication with the space portion of the cylinder and fitted to the front side of one of the space portion in the cylinder 101, and the front side of the adapter tube The injection liquid discharge pipe 106 and the inner diameter of the adapter pipe 105 are formed in the state protruded in the state having a diameter smaller than the diameter of the adapter tube 105 in communication with the inside of the adapter tube, A fitting tube 107 which presses the adapter tube toward the cylinder 101 and keeps the adapter tube 105 and the cylinder 101 in an airtight state, and an injection liquid discharge tube 106 formed in the adapter tube 105. The needle fixed tube 109 coupled to the needle 108 fixed to the needle 108 and the center portion of the front end of the pusher 103 formed in the inclined state of the axial center line of the rear side thereof in an inclined state to perform the injection. When the push rod 103 is moved forward to the front end portion is completely passed through the fitting pipe 107 is located in the inner diameter portion of the injection liquid discharge pipe 106, the pressure piece 112 for eccentrically pressing the specific portion of the injection liquid discharge pipe And a fitting tube moving means for moving the fitting tube 107 inserted into the adapter tube 105 to the rear when the pushing rod 103, which has been moved to the front after completion of the injection, is moved backward. remind When the fitting pipe 107 inserted in the tubular pipe 105 is moved to the rear in the state that the push rod 103 continues to be pulled to the rear to move the rear tube 105 together from the moment at which it is moved It is to provide a disposable safety syringe including an adapter tube moving means.

Syringe, syringe, needle

Description

Disposable Safety Syringe

1 is an exploded perspective view showing a commonly used disposable syringe

Figures 2a to 2b is a longitudinal cross-sectional view showing to explain the state of use of a disposable syringe generally used

Figure 3 is an exploded perspective view showing a conventional disposable safety syringe

Figure 4a to 4e is a longitudinal cross-sectional view showing for explaining the use state of a conventional disposable safety syringe

Figure 5 is a perspective view showing the separation of the needle pinned tube and the push rod as a component of a conventional disposable safety syringe

Figure 6 is an exploded perspective view showing a disposable safety syringe according to an embodiment of the present invention

Figure 7 is a longitudinal section of the main portion showing a disposable safety syringe according to an embodiment of the present invention

8a to 8f is a longitudinal sectional view showing a state of use of the disposable safety syringe according to an embodiment of the present invention

Figure 9 is a perspective view showing only the main components of the disposable safety syringe according to an embodiment of the present invention separately

10 is an exploded perspective view showing a disposable safety syringe according to another embodiment of the present invention.

Figure 11 is a longitudinal cross-sectional view showing the main part disposable safety syringe according to another embodiment of the present invention.

12 is a perspective view showing only the main components of the disposable safety syringe according to another embodiment of the present invention separately

Explanation of symbols for the main parts of the drawings

101. Cylinder 101a. Groove

101b. Concave groove 103.

104. Piston 105. Adapter tube

105a. Second catching jaw 105b. Projection

105c. Protrusion piece 106. Injection liquid discharge pipe

107. Fitting tube 107a. First jaw

107b. Second locking projection 107c. First slope

107d. Second inclined plane 108. Needle

109. Needle protection tube 112. Pressurized piece

112a. First jamming protrusion

The present invention relates to the field of disposable syringes, and more particularly, after the injection, the needle is inserted into the space within the cylinder so that the needle is not exposed to the outside, so that the user or patient injects the syringe in the process of discarding the syringe after use. The present invention relates to a disposable safety syringe that prevents the needle from being stuck in the needle in the process of processing the discarded syringe as well as preventing the needle being stuck.

In general, a disposable syringe has a cylinder 1 formed therein with a space therein and a coupling tube 2 in a stepped state, as shown in FIGS. 1 and 2, and a cylinder 1 in the space within the cylinder. The push rod 3 is inserted to move forward and backward along the longitudinal direction of the push rod, and the front side of the push rod moves together in a state of being in airtight contact with the cylinder 1 when moving the push rod 3 forward and backward. Piston (4) is coupled to provide a compression force or to provide a suction force, the needle fixing tube (5) from the outside is detachably coupled to the coupling tube (2) formed in the cylinder (1), the needle fixing tube The needle 6 is fixed so as to be inserted into the skin of the patient during use, and the needle protection cap 7 is detachably attached to the needle fixing tube 5 so as to protect the needle 6 in a completely wrapped state. texture It is a structure that is combined.

Referring to the use of such a general disposable syringe is as follows.

2A is a longitudinal cross-sectional view showing a generally used disposable syringe, in which a push rod with a piston is moved to the rear side before injection, in which state the push rod is coupled to the space-loading push rod 3 in the cylinder 1. The injection liquid is sucked and filled in the left part of the figure on the basis of the piston (4).

In order to inject the injection liquid into the space in the cylinder 1, the user (doctor or nurse) has previously been protected by the needle (5) to protect the needle (5) fixed to the needle fixing tube (5) The protective cap 7 is separated from the needle fixing tube 5 so that the needle 6 is exposed to the outside and the push rod 3 inserted into the space portion of the cylinder 1 is moved forward. In such a state, the end of the needle 6 is immersed in the injection liquid filled in the injection container (not shown), and the piston 4 is moved backward together with the push rod by pulling the push rod 3 backward. In this process, when the piston 4 coupled to the pusher 3 is moved backward by the pulling of the pusher 3, the suction force is provided to the space in the cylinder 1 in this process. In the syringe It is understood that the filled injection liquid is sucked through the injection needle 6 fixed to the injection needle holding tube 5 and filled in the space part in the cylinder 1.

In the state as shown in FIG. 2A, the user moves the cylinder 1 toward the front side of the patient, inserts the needle 6 into the patient's skin, and then pushes the rod 3 to move the piston 4 provided in the rod. In the forward direction, as the compression force is provided on the left side of the drawing based on the piston 4 of the space part in the cylinder 1, the injection liquid filled in the space part of the cylinder 1 receives the compression force and the cylinder 1 The injection solution exiting the coupling tube (2) formed in the), and exits the coupling tube is continuously administered into the patient's skin through the needle (6) fixed to the needle fixing tube (5), This state is attached to FIG. 2B.

In addition, after the use of the syringe, the needle protection cap (7), which was separated, is re-engaged with the needle fixing tube (5) coupled to the coupling tube (2) of the cylinder (1). The needle (5) must be completely wrapped and then discarded.

The general disposable syringe described above is a situation in which the disposable disposable syringe is protected after being completely covered with the needle 6 fixed to the needle fixing tube 5 as the needle protection cap 7 when discarded after use. In the process, the doctor or nurse as a user has a problem that a safety accident is frequently stuck to the needle (6), and if the general disposable syringe is used in patients with infectious pathogens such as AIDS patients, the seriousness of the safety accident is even more serious. I think it will grow.

On the other hand, even if the problem does not occur in the process of using a disposable syringe, since the medical waste is handled by a specialized waste disposal company, the needle protection cap that protects the needle 6 in this process ( While 7) is separated, the worker who handles the waste may be stuck in the needle 6, and in this case, there was a problem of the above-mentioned safety accident.

Therefore, in the industry of manufacturing medical machinery and apparatus, in order to solve the problems of the above-mentioned general disposable syringes, the disposable safety syringes which are used for single use and do not cause accidents caused by needles in the process of disposal after use are widely used. There is a situation.

So here it will be described with reference to Figures 3 to 5 attached to the conventional disposable safety syringe as follows.

One end and the other end in communication with the inner space portion and the front side has a cylinder (11) formed in the stepped state of the coupling pipe 12, the inner space in the cylinder in the longitudinal direction of the cylinder (11) , The push rod 13 is fitted to be moved in the rear direction, and the front side of the push rod is provided in the airtight contact state with the cylinder 11 when the front and rear movement of the push rod 13 while providing a compressive force or suction force Piston 14 is coupled to provide, and in the coupling tube 12 formed in the cylinder 11, the needle fixing tube 15 is inserted from the space side in the cylinder 11 so that the front end thereof is exposed to the outside. Is coupled, the injection needle 16 is fixed to the front of the cylinder 11, the external exposure portion of the needle fixing tube to be inserted into the skin of the patient when in use, the coupling tube formed on the front of the cylinder ( One 2) the needle protection cap 17 is detachably coupled to the outside of the needle 16 to protect the needle 16 in a wrapped state, and the rod 13 is located near the piston 14 of the rod 13. Cutting grooves 18 are formed so that they can be easily broken.

Meanwhile, a flange 15a is formed at the rear outer circumference of the needle fixing tube 15 so as to catch the integrated stepped portion as the coupling tube 12 is stepped on the cylinder 11, which is the needle. In the state in which the fixed tube 15 is inserted into and coupled to the coupling tube 12 formed in the cylinder 11, the forward movement of the needle fixing tube 15 is limited by the flange 15a, and the cylinder ( An o-ring 19 is fitted into an inner diameter of the coupling tube 12 formed at 11, which is the O-ring 19 when the needle fixing tube 15 is coupled to the coupling tube 12 formed at the cylinder 11. In order to keep the gap between the coupling tube 12 and the needle fixing tube 15 in an airtight state.

In addition, a pair of locking jaws 15b are formed at the rear end inner diameter portion of the needle fixing tube 15 so as to face each other, and the needle at the front end of the push rod 13 at any moment pushes the push rod toward the front. The catching piece 13a is formed to be caught by the interference with the catching jaw 15b formed in the inner diameter portion of the fixing tube 15, and faces the catching piece 13a of the catching jaw 15b. The part facing the locking jaw 15b of the viewing part and the locking piece is in contact with the contact when the locking piece 13a overcomes the interference force of the locking jaw 15b and is inserted into the rear inner diameter of the needle fixing tube 15. It has an inclined surface to receive as little interference as possible.

Referring to the process of using a conventional disposable safety syringe configured as described above are as follows.

4A is a longitudinal cross-sectional view showing a conventional disposable safety syringe, in which the piston is moved to the rear side together with the push rod before injection, in this state the piston 14 coupled to the space-loading push rod 13 in the cylinder 11. In the drawing, the injection liquid is sucked and filled in the left part, and the procedure for allowing the injection liquid to be sucked and filled into the space in the cylinder 11 can be sufficiently understood by referring to the procedure of a general disposable syringe described above. It will be omitted.

In the state as shown in FIG. 4A, the user grabs the cylinder 11 by hand and moves to the patient, inserts the needle 16 fixed to the needle fixing tube 15 into the patient's skin, and then pushes the push rod 13. When the piston 14 is moved forward with the push rod, the injection liquid filled with the space in the cylinder 11 is provided as the compressive force is provided on the left side in the drawing based on the piston 14 among the space in the cylinder 11. Compression force is applied, and the space in the cylinder 11 is inserted into the coupling tube 12 formed at the front side of the cylinder 11 while the needle fixing tube 15 is fitted in the state in which the needle 16 is fixed. The injection solution filled in the portion is continuously dosed into the patient's skin through the needle 16, the state in which the injection solution is completed is shown in Figure 4b.

In the state in which the needle fixing tube 15 is inserted into and coupled to the coupling tube 12 formed in the cylinder 11, the flange 15a formed around the rear outer side of the needle fixing tube is coupled to the cylinder 11. As the step 12 is formed to be stepped to be integrated into the stepped portion, the forward movement of the needle fixing tube 15 is limited by the flange (15a), in this case the coupling pipe formed in the cylinder (11) O-ring 19 fitted in the inner diameter of (12) maintains the gap between the coupling tube 12 and the needle fixing tube 15 in the airtight state, so that the cylinder (11) in accordance with the forward movement of the push rod (13) The injection liquid filled in the space within the cavity does not easily leak out when the medication is taken out of the cylinder.

In the state in which the injection solution is administered to the patient by this process, the piston 14 together with the push rod 13 is completely moved forward, and in this state, the push rod 13 is shown in FIG. 4B. The locking piece (13a) formed at the front end of the win over the locking force of the locking jaw (15b) formed in the state facing each other around the inner diameter portion of the rear of the needle fixing tube 15 due to the elastic force of the material itself It is inserted into the inner diameter portion of the needle fixing tube 15 to be caught on the locking step (15b).

In the state as shown in FIG. 4B, the cylinder 11 is moved to the opposite side of the patient to remove the injection needle 16 inserted into the skin of the patient, and at the same time, while the cylinder 11 is held with one hand, the pusher is pressed with the other hand ( 13) pulls strongly toward the rear side, the locking piece 13a formed at the front end of the push rod is inserted into the rear inner diameter portion of the needle fixing tube 15 to the locking jaw 15b formed at the rear inner diameter portion. As the hook 13 is moved to the rear side together with the needle fixing tube 15 while being hung fully positioned into the space in the cylinder 11 as shown in Figure 4c, in this case fixed to the needle fixing tube 15 The needle 16 is also completely inserted into the space portion in the cylinder 11, and the needle fixing tube 15 is completely inserted into the space portion in the cylinder 11 and is positioned. Since the rear end is in a state of being hung on the front end of the push rod 13, due to the eccentric center of gravity, it is inclined in the direction of gravity with the back end, which is the point of engagement with the push rod, as a support point. In this case, since only the front end of the needle 16 fixed to the needle fixing tube 15 contacts the inner diameter of the cylinder 11, the needle fixing tube 15 and the needle 16 are in an oblique state. Keep the slope.

Then, the cutting groove 18 formed in the push rod 13 is positioned in a state of being close to the rear outer side of the cylinder 11 and then repeatedly pressed the push rod 13 in a direction perpendicular to the longitudinal direction. By the pressing force, the cutting groove 18 portion of the rod 13 is cut as shown in FIG. 4D. After the rod is cut, the outer portion of the cylinder 11 is pushed forward so that the cut portion enters the inside. 4E through the coupling tube 12 as shown in Figure 4e so that the injection needle 16, which entered the space portion in the cylinder 11 during the disposal process does not escape to the outside through the coupling tube 12.

Therefore, since the needle 16 does not escape from the inside of the cylinder 11 to the outside in any case, the user does not get stuck on the needle 16 in the process of discarding the used syringe, as well as processing the discarded syringe. The worker who handles the waste in the process is not stuck to the needle 16 will not cause a safety accident.

However, such a conventional safety syringe has been using the O-ring 19 to seal in order to maintain the airtight state between the needle fixing tube 15 and the coupling tube 12 has the following problems.

First, in view of the fact that the O-ring 19 is a component having a very sensitive deformation even by low external pressure, the aligned O-ring 19 is moved to the cylinder 11 as well as in the process of the various parts being aligned through the automatic assembly line for assembling the syringe. In the process of inserting into the coupling tube 12 of the) is easily crushed, and thus the O-ring 19 is not inserted into the coupling tube 12 stably the defect rate is high, as well as to solve the problem a little. In order to provide a variety of complex additional equipment to the assembly line, the cost burden increases the product cost.

Second, since the defective state of the O-ring 19 is mostly not easily identified by the naked eye, there is a high probability that the defective O-ring is used, and in this case, the injection liquid leaks in the process of using the assembled syringe. Will be given.

The present invention has been made in order to solve the above-mentioned problems, and when using the needle fixed tube fixed needle to the cylinder using a deformable sensitive O-ring without using an intermediate member adapter tube and fitting tube The purpose is to achieve a perfect sealing of the coupling portion of the needle holding tube.

The object of the present invention is provided with a cylinder having a space therein and communicated in a state in which the front end of one end and the rear end of the other end is open, the space in the cylinder in the front and rear in the longitudinal direction of the cylinder The push rod is fitted to be selectively moved, and the front circumferential portion of the push rod is coupled to the piston to provide a compressive force or a suction force while moving together in airtight contact with the cylinder when the push rod is moved forward and backward. The adapter tube is inserted into the front of the one end of the space in the cylinder and in communication with the space of the cylinder, and the diameter smaller than the diameter of the adapter tube protrudes from the center of the front end of the adapter tube to form the protrusion tube. The injection liquid discharge tube in communication with the inside and the inner diameter of the adapter tube are inserted into the cylinder tube toward the cylinder. A fitting tube that pressurizes the tube while keeping the cylinder and the cylinder in a gastight state, a needle fixing tube which is coupled to the injection liquid discharge tube formed in the adapter tube and fixed with a needle, and a central portion at the front end of the push rod. The rear axial centerline is formed in an inclined state so that when the push rod is moved forward for the injection, the end portion is completely passed through the fitting tube and is located in the injection liquid discharge pipe to pressurize a specific portion of the injection liquid discharge pipe. When the pressing piece and the push rod which has been moved to the front side after the completion of the injection are pulled back to move the fitting tube moving means for moving the fitting tube fitted to the adapter tube to the rear side, and the fitting tube fitted to the adapter tube is When moving the push rod to the rear while moving backward May be accomplished by providing a disposable safety syringe, it characterized in that the hayeoseo including eodeopteo tube moving means that moves towards the rear together eodeopteo tube from one point to be moved.

Hereinafter, the present invention will be described in more detail with reference to the attached FIGS. 6 to 9 and the attached FIGS. 10 to 12, which illustrate another embodiment as follows.

Attached Figure 6 is an exploded perspective view showing a disposable safety syringe according to an embodiment of the present invention, Figure 7 is an enlarged longitudinal sectional view of the main portion showing a disposable safety syringe according to an embodiment of the present invention, Figure 8a to 8f is the present invention 9 is a longitudinal sectional view showing a state of use of the disposable safety syringe according to the embodiment, and FIG. 9 is a perspective view showing only the main components of the disposable safety syringe according to the embodiment of the present invention, in which one end and the other end communicate with each other. A cylinder portion 101 having a space portion and one end of the coupling pipe 102 formed in a stepped state is provided, and the space portion in the cylinder is selectively moved forward and backward along the longitudinal direction of the cylinder 101. Push rod 103 is inserted so that the front circumference of the push rod, while moving forward and backward of the push rod 103 in a state of being in airtight contact with the cylinder 101 pressure The piston 104 is coupled to provide a force or to provide a suction force, the adapter tube 105 is fitted in front of one end of the space in the cylinder 101 in communication with the space of the cylinder, the adapter In the central portion of the front end of the tube, the injection liquid discharge tube 106 protrudes while being in communication with the adapter tube in a state having a diameter smaller than that of the adapter tube 105.

In addition, the inner tube portion of the outer tube 105 is pressed by the outer tube 105 toward the cylinder 101, the fitting tube 107 is fitted so that the outer tube 105 and the cylinder 101 are kept in an airtight state. The injection liquid discharge tube 106 formed in the tube 105 is coupled to the needle fixing tube 109 in a state where the needle 108 is fixed, and the needle is fixed to the needle fixing tube to protect the needle 108. The protective cap 110 is detachably coupled, and the cutting groove 111 is formed at a portion close to the piston 104 of the rod 103 so as to be easily broken and cut when bending the rod 103 in a disposal process after use. Is formed.

At the front end of the pusher 103, the pressing piece 112 is formed with its axial centerline inclined, and when the pusher 103 is pushed forward, the end of the pressing piece 112 is fitted. The injection liquid discharge pipe 106 is subjected to the eccentric pressing force of the pressure piece 112 as it passes through the contact 107 and comes into contact with the injection liquid discharge pipe 106 formed in the adapter tube 105.

A first catching jaw 107a is formed in the inner diameter portion of the fitting tube 107 along the circumference, and a first catching protrusion 112a is formed in the outer diameter portion of the pressing piece 112 in the forward direction after completion of the injection. When the pushing rod 103 is moved to the rear side again, the locking protrusion 112a is caught by the locking jaw 107a, and the fitting tube 107 inserted in the adapter tube 105 is moved to the rear side together. Accordingly, while the pressing force on the cylinder 101 side of the adapter tube 105 is released, the airtightness between the adapter tube 105 and the cylinder 101 is also released.

The first locking projection (112a) formed in the outer diameter portion of the pressing piece 112 in the above is preferable to have an elastic force, which is the pressing piece 112 is fitted as the push rod 103 to move forward for the injection. When passing through the inner diameter portion of the tube 107, even if the first engaging projection (112a) is in contact with the fitting tube 107 and interfere with the initial contact with the outer diameter of the pressing piece 112 with elastic force to smoothly overcome the interference force It is intended to be.

In addition, a second catching jaw 105a is formed in the inner diameter portion of the outer tube 105 along a circumference, and a second catching protrusion 107b is formed in the outer diameter portion of the fitting tube 107 along the plunger 103 As the fitting tube 107 is moved together by the continuous rear movement of the second engaging projection 107b is caught by the second catching jaw 105a, the fitting tube 105 is moved to the rear side together as the fitting The tube 107 and the adapter tube 105 are allowed to completely enter the inner diameter of the cylinder 101 at the same time.

The tapered first inclined surface 107c having a smaller outer diameter toward the front portion from the rear side to the portion to be in contact with the second catching jaw 105a formed in the outer tube 105 among the outer diameter portions of the fitting tube 107 in the above. It is preferable to form a), which is the first when the fitting tube 107 is in contact with the second engaging jaw (105a) in the process of fitting the fitting tube 107 into the inner diameter of the adapter tube 105, the first In order to smoothly overcome the interference force due to the inclined surface (107c), the outer diameter of the portion to be in contact with the rear end of the outer tube 105 of the outer diameter portion of the fitting tube 107 from the rear side toward the front It is preferable to form a tapered second inclined surface 107d which becomes smaller and smaller, which means that the fitting pipe 107 is attached to the inner tube of the adapter tube 105 by the fitting tube 107. Initial interference with the second inclined plane 107d when interfering with the initial contact So to win in order to facilitate it.

A portion of the space in the cylinder 101 to which the adapter tube 105 is to be fitted is formed with a plurality of fitting grooves 101a spaced apart at regular intervals along the periphery thereof, and the periphery of the adapter tube 105 at its outer diameter portion. A plurality of fitting protrusions 105b are formed in a state spaced apart along a predetermined interval so that the fitting protrusion 105b is fitted into the fitting groove 101a in a state where the adapter tube 105 is inserted into the space portion in the cylinder 101. Accordingly, even if the circumferential rotational force is applied to the outer tube 105, the outer tube does not actually rotate.

On the other hand, a semicircular recessed groove 101b is formed along the periphery of the rear portion of the space in which the outer tube 105 is to be fitted, and the outer tube of the outer tube 105 is formed at the rear of the outer tube. The semicircular protrusion 105c is formed along the circumference so as to face the recessed groove 101b when the cylinder 101 is fitted into the space portion of the cylinder 101 so that the fitting pipe 107 is fitted into the inner diameter of the adapter tube 105. Accordingly, when the outer tube is pressed toward the cylinder 101, the protrusion piece 105c is accommodated in the recessed groove 101b so that the airtightness of the outer tube 105 and the cylinder 101 is further improved.

In the embodiment of the present invention described above, the injection liquid discharge tube 106 formed at the front end of the adapter tube 105 is fitted with a needle fixing tube 109 to which the needle 108 is fixed as described above. At this time, the elliptical flange 109a is formed at the end of the outer tube 105 engaging portion, which is the rear side of the outer circumferential surface of the needle fixing tube 109, in order to improve its coupling force and ensure convenience of use. In the inner diameter portion of the coupling pipe 102 formed in the cylinder 101, a spiral protrusion 102b is formed in a spiral state so that the needle fixing tube 109 is connected to the spiral protrusion of the coupling pipe 102 by a flange 109a. The needle fixing tube 109 is fitted into the injection liquid discharge tube 106 by being screwed into the 102b, but it is not necessarily limited thereto, and the coupling tube 102 is disposed at the front side of the cylinder 101 at the front end thereof. Cylinder and stepped phase 10 to 12 instead of forming the shape directly to the coupling pipe 102 as shown in another embodiment in the adapter tube 105, the inner diameter of the coupling tube 102 formed in the adapter tube helix The needle fixing tube 109 is formed by forming a spiral protrusion 102b and screwing the needle fixing tube 109 into the spiral protrusion 102b of the coupling tube 102 by a flange 109a. There is no major problem in the use of the present invention even if it is fitted in the 106.

On the other hand, the opposite surface of the piston 104, which is the rear end surface of the fitting tube 106, which is a component of the present invention, is inclined to be dug toward the inner diameter portion from the outer diameter side thereof, and the front end surface of the piston 104 is The opposite surface of the phosphor fitting tube 106 is inclined so as to protrude from the outer diameter side to the inner diameter portion, so that the piston 104 is moved forwards together by the forward movement of the pusher 103. Protruding inclined portion of the) to be accurately accommodated in the inclined inclined portion of the fitting tube 106, which is the piston 104 together with the push rod 103 in the course of use of the disposable safety syringe of the present invention described below This is to allow the injection liquid filled in the cylinder 101 to smoothly move toward the fitting tube 106 while leaving the cylinder 101 while providing a compressive force while moving.

Prior to explaining the use process of the present invention disposable safety syringe configured as described above will briefly describe the assembly process.

When the injection liquid discharge tube 106 formed in the adapter tube 105 faces the cylinder 101 and is positioned side by side at the rear side of the cylinder, and then the adapter tube 105 is moved forward, the adapter tube is the cylinder 101. After being inserted into the space portion in the ()) and subsequently inserted into a state in close proximity to the coupling tube 102 formed on the front side of the one end of the cylinder, the outer peripheral portion of the adapter tube 105 in the cylinder 101 It is in light contact with the inner circumference.

In the state where the adapter tube 105 is fitted to the space portion in the cylinder 101, a plurality of fitting grooves are spaced apart at regular intervals along the circumference of the space portion in the cylinder 101 to which the adapter tube 105 is to be fitted. A plurality of fitting protrusions 105b are formed in the outer diameter portion of the outer tube 105 at a predetermined interval along the circumference thereof so that the fitting protrusions 105b are fitted into the fitting grooves 101a. It can only be fitted to, which is the needle pinning tube when the needle pinning tube 109 is fixed to the needle 108 is fixed to the injection liquid discharge tube 106 formed in the outer tube 105 in the process described later ( 109), even if the rotational force is transmitted to the adapter tube 105 through the injection liquid discharge tube 106, the adapter tube is actually fixed in the needle so that the circumferential rotation does not occur in any case 109 to ensure a stable bond with the injection liquid outlet tube 106 is in friction.

Thereafter, the fitting pipe 107 is inserted into the space in the cylinder from the rear side of the cylinder 101 and moved forward, so that the fitting pipe 107 is fitted into the inner diameter portion of the adapter tube 105 from the moment of movement. In this case, a second catching jaw 105a is formed in the inner diameter portion of the adapter tube 105 along the rear circumference, and a second catching protrusion is formed along the front circumference in the outer diameter portion of the fitting tube 107. 107b) is formed so that the second catching protrusion is interfered by being caught by the second catching jaw 105a once, and then the operator pushes the fitting pipe 107 further forward to move the second catching protrusion 107b. Since the win over the interference force of the second catching jaw (105a) by the elastic force of the material itself, the fitting pipe 107 is moved to the front and is fitted in the inner diameter portion of the outer tube 105 in a perfect state.

When the fitting tube 107 is fitted into the inner diameter portion of the adapter tube 105, the second catching projection 107b can overcome the interference force caused by the contact of the second catching jaw 105a, the fitting tube The tapered shape of the second engaging projection 107b formed to be in initial contact with the second engaging jaw 105a formed in the outer tube 105 of the outer diameter portion 107 is gradually smaller from the rear side toward the front side. Since the first inclined surface 107c is formed, it is understandable.

Meanwhile, in the process of fitting the fitting tube 107 to the inner diameter of the adapter tube 105, the fitting tube 107 is the adapter tube after the second catching protrusion 107b overcomes the interference force of the second catching jaw 105a. Before fully fitted to the 105, the outer circumferential rear end portion of the fitting tube 107 is caught once in contact with the inner end of the inner diameter portion of the adapter tube 105, even in this case the fitting tube 107 As the tapered second inclined surface 107d is formed in the outer circumferential portion of the outer diameter portion of the rear portion from the rear side to the front side, the fitting tube 107 is completely connected to the inner diameter portion of the adapter tube 105. In the process of fitting, the interference problem due to contact with the adapter tube is not generated.

In this way, when the fitting tube 107 is completely fitted into the inner diameter of the adapter tube 105, the fitting tube 107 presses the rear portion of the adapter tube 105 toward the cylinder 101, so that the adapter tube The injection fluid is maintained in an airtight state between the 105 and the cylinder 101 to provide a compressive force for pushing the injection while the rod 103 moves forward in the course of the use of the syringe. It does not leak between the 101, in this case, the adapter tube 105 as a semicircular recessed groove 101b formed along the periphery of the portion of the space in the cylinder 101 to the rear of the portion to be fitted Since the semicircular protrusions 105c formed along the circumference of the outer diameter portion of the c) are inserted and accommodated, the protrusions serve as packings, thereby further improving the airtightness of the adapter tube 105 and the cylinder 101. this In this case, the injection liquid does not leak through the adapter tube 105 and the cylinder 101 under any circumstances.

Through this process, after the adapter tube 105 is fitted into the space portion in the cylinder 101, and the fitting tube 107 is fitted into the adapter tube and assembled, the piston 104 into the space portion in the cylinder 101 is assembled. And a push rod 103 having a cutting groove 111 formed therein, and then the injection needle into the injection liquid discharge pipe 106 formed in the outer tube 105 at the front outer side of the cylinder 101. Insert the needle fixing tube 109 is fixed to the 108 is fixed and then combined the needle protection cap 110 to the needle fixing tube so that the needle protection cap to protect the needle 108 in a wrapped state The process of coupling the needle fixing tube 109, to which the needle 108 is fixed, to the injection liquid discharge tube 106 of the outer tube 105, and the needle protection cap 110 to the needle fixing tube 109 ) Is combined with Although the present invention may be carried out when assembling the safety syringe for the first time, it is not necessarily limited thereto and may be performed at the stage immediately before the user uses the safety syringe of the present invention.

When the needle fixing tube 109 is coupled to the injection liquid discharge tube 106 formed in the outer tube 105, the needle fixing tube may be directly inserted into the injection liquid discharge tube 106, but in order to improve bonding strength and ensure convenience of use. 6 to 9, a substantially elliptical flange 109a and a cylinder 101 formed at the end of the coupling portion of the injection liquid discharge tube 106, which is the rear side of the outer circumferential surface of the needle fixing tube 109, as shown in the embodiment shown in FIGS. It will be desirable to use the spiral projection (102b) is formed in a spiral state on the inner diameter of the coupling pipe 102 formed integrally in a stepped state at the front side of the front) of course another embodiment shown in Figures 10 to 12 As shown in the outer side of the outer peripheral surface of the needle fixing tube 109, the cylinder 101 on the rear side of the approximately elliptical flange (109a) and the adapter tube 105 formed at the end of the coupling portion discharge end 106 It is preferable to use the spiral protrusion (102b) formed in a spiral state in the inner diameter portion of the coupling tube 102 integrally formed in a stepped state, the scanning using the flange (109a) and the spiral protrusion (102b) When the needle fixing tube 109 is coupled to the injection liquid discharge tube 106 of the outer tube 105, the needle fixing tube 109 is first inserted into the coupling tube 102 to form an ellipse formed in the needle fixing tube 109. The two opposing parts of the flange 109a interfere with the spiral protrusion 102b formed in a spiral state on the inner diameter of the coupling pipe 102 and then rotate the needle fixing tube 109 in the tightening direction. When the needle fixing tube rotates in the tightening direction, the needle fixing tube 109 is moved toward the cylinder 101 at the rear side as the flange 109a is guided to the spiral protrusion 102b and the tightening is completed. Eventually remind The needle fixing tube 109 is coupled to the injection liquid discharge tube 106 of the outer tube 105.

Although the assembly of the present invention disposable safety syringe described above may be artificially made by a person, it is understood that most of the assembly is automatically performed by a mechanical device.

Referring to the use process of the present invention disposable safety syringes configured as described above is as follows, for the use of the present invention disposable safety syringes first to protect the needle needle 108 is the front of the needle protection cap 110 Pulling away from the cylinder 101, the needle protection cap 110 is to be separated in advance from the needle fixing tube 109 has to go through a pre-process to release the protection state of the needle 108.

8A is a longitudinal cross-sectional view showing a disposable safety syringe according to an embodiment of the present invention, in which a piston is moved backward with a push rod before injection, in this state, a space-loading push rod 103 in the cylinder 101 is shown. Based on the piston 104 provided in the drawing, the injection liquid is sucked and filled in the left part of the drawing, and the procedure for allowing the injection liquid to be sucked and filled into the space portion in the cylinder 101 is the procedure of a general disposable syringe described above. Note that it will be fully understood and will be omitted.

In the state as shown in FIG. 8A, the user grasps the cylinder 101 by hand and moves toward the patient so that the needle 108 fixed to the needle fixing tube 109 is inserted into the patient's skin and then pushes the rod 103. When the piston 101 is moved forward along with the push rod by pushing the rod, the injection liquid filled with the space in the cylinder 101 is provided as the compressive force is provided on the left side of the drawing based on the piston 104 of the space in the cylinder 101. This compression force is received, in which the outer tube 105 coupled to the front of the space portion in the cylinder 101 is in a gas tight state with the cylinder 101 due to the fitting tube 107 as already described in the assembly process. As it is maintained, the injection liquid exiting the cylinder 101 is discharged through the injection liquid discharge pipe 106 formed in the outer tube 105 without leaking to the outside. The discharged injection solution is continuously injected into the patient's skin through the needle 108 fixed to the needle fixing tube 109, and the injection of the injection solution is completed. It is well shown in FIG. 8B as it is fully moved toward it.

On the other hand, in the state as shown in FIG. 8B, the opposite surface of the piston 104, which is the rear end surface of the fitting pipe 107, is inclined to be excavated from the outer diameter side toward the inner diameter side, and the front end of the piston 104. The opposite surface of the fitting tube 107, which is a cross section, is inclined to protrude from the outer diameter side to the inner diameter portion, so that the projecting inclined portion of the piston 104 is an inclined inclined portion of the fitting tube 107. Which is filled in the cylinder 101 when a compressive force is applied to the inner diameter of the cylinder 101 during the previous process, that is, the piston 104 is moved forward by the pusher 103. Due to the inclined portion of the insertion tube 107, the injection liquid naturally gathers toward the center along the inclination portion, and as a result, the injection liquid in the cylinder 101 is smoothly moved toward the insertion tube 107. Since it exits the cylinder 101, when the injection is made in the state where the push rod 103 is moved forward, the injection liquid does not remain in the cylinder 101.

The state in which the injection solution is administered to the patient by the above process is a state in which the push rod 103 is completely moved forward as described above, and in this case, the front end of the push rod 103 as shown in FIG. 8B. Since the pressing piece 112 protruding from the center portion is fitted into the inner diameter portion of the injection liquid discharge pipe 106 formed in the outer tube 105 through the inner diameter portion of the fitting tube 107, the end of the pressing piece 112 is The pressing piece 112 is in contact with a specific portion of the injection liquid discharge pipe 106, the pressure piece 112 is inserted into the inner diameter portion of the injection liquid discharge pipe 106 through the inner diameter of the fitting pipe 107 in contact with the pressing piece ( Given that the rear axial center line of 112 is inclined to either side, the injection liquid discharge pipe 106 has a force to be inclined to one side under the eccentric pressing force of the pressing piece 112, and is actually inclined. It is understandable to stay in a non-existent state.

On the other hand, although not shown in the drawings of the present invention and the configuration thereof according to the portion of the inner diameter of the injection liquid discharge pipe 106 to the end of the pressing piece 112 to be contacted to form a locking step along the circumference, the pressing piece 112 At the end of the), if the locking projection is formed to be located in front of the locking jaw, the locking projection is pulled to the rear side in the subsequent process, and thus the locking projection is caught on the locking jaw when the pressing pieces 112 move together. Since the back movement force is applied to the 106, it is considered to be of great help in the rearward movement of the outer tube 105.

In the state shown in FIG. 8B, the user moves the cylinder 101 to the opposite side of the patient, pulls out the injection needle 108 inserted into the skin of the patient, and simultaneously pulls the push rod 103 that has been moved to the front side and moves backward. In addition, the pressing piece 112 formed on the push rod also moves rearward, wherein the first catching protrusion 112a formed at the outer diameter portion of the pressing piece 112 is fitted in the fitting pipe 107. As the neck is caught by the first catching jaw 107a formed along the circumference, the rear movement force of the pusher 103 is fitted through the first catching protrusion 112a formed on the pressing piece 112. Since the fitting tube is eccentrically transmitted to the inner diameter portion of the adapter tube 105 as shown in FIG. 8C to some extent, in this case, the cylinder (10) is transmitted to the adapter tube 105 by the fitting tube 106. The pressure on the 101 side is released Eodeopteo the tube 105 is a tight contact with the coupling pipe (102) is in the release state already.

Since the push rod 103 is further pulled and moved to the rear side, the press piece 112 formed on the push rod also moves to the rear side as described above, so that the fitting pipe 107 also moves backward by the press piece. The second catching projection 105a in which the second catching protrusion 107b formed at the outer diameter portion of the fitting tube 107 is formed at the inner diameter portion of the adapter tube 105 at any moment when the fitting tube moves backward. At this time, the fitting tube 107 is pulled out of the adapter tube 105 to the rear, and in this case, the injection needle 108 is fixed to the injection liquid discharge tube 106 formed in the adapter tube. As the needle fixing tube 109 is fitted, the needle fixing tube eventually moves rearward together with the adapter tube 105 while the needle 108 is fixed and moves to the space in the cylinder 101 as shown in FIG. 8D. Completely listen Is located.

On the other hand, in the state where the needle fixing tube 109 to which the needle 108 is fixed as shown in FIG. 8D is completely inserted into the space portion in the cylinder 101 together with the adapter tube 105, the rear side of the adapter tube 105 is located. Only the support of the fitting tube 107 in the state having a considerable clearance with the cylinder 101 is not supported by any other components other than the combination of the adapter tube 105 and the needle fixing tube 109 Since the eccentric pressing force of the pressing piece 112 formed in the push rod 103 as well as the combination itself receives the eccentric weight, the combination of the adapter tube 105 and the needle fixing tube 109 is the fitting tube 107 and It is reliably inclined in the direction of gravity with respect to the rear end, which is the supporting point of, in this case, only the front end of the needle 108 fixed to the needle fixing tube 109 is provided on the inner diameter of the cylinder 101. Contact with the injection Needle holding tube 109 and the needle 108 is to maintain the oblique inclined state when the cylinder 101 in a horizontal state.

Thereafter, the cutting grooves 111 formed in the pushing rod 103 are positioned in a state of being close to the rear outer side of the cylinder 101, and then the rear side of the pushing rod 103 is several times in a direction perpendicular to the longitudinal direction. When repeatedly pressed, the cutting groove 111 of the push rod 103 is broken by the pressing force and is cut as shown in FIG. 8E. After the push rod 103 is cut, the push rod 103 outside the cylinder 101 is cut. ) Is placed side by side in front of the cylinder so that the cut portion is toward the cylinder 101, and then inserts a substantial portion into the space in the cylinder 101 through the coupling tube 102 as shown in Figure 8f the cylinder ( Since the front opening part, which is one end of the 101, is closed, the needle 108 of the needle fixing tube 109, which has entered the space in the cylinder 101 during the disposal of the syringe after use, exits the cylinder 101. There is no work.

Therefore, since the needle 108 does not escape from the inside of the cylinder 101 to the outside in any case, the user does not get stuck in the needle 108 in the process of discarding the used syringe, as well as processing the discarded syringe. The worker who handles the waste in the process is not stuck to the needle 108 will not cause a safety accident.

Therefore, the disposable safety syringe of the present invention does not use an easily deformable O-ring when the needle holder tube 109 on which the needle 108 is fixed in the airtight state is fitted with the adapter tube 105 and the fitting tube. Since the sealing with the cylinder 101 is completed using 107, the following effects are obtained.

First, the adapter tube 105 and the fitting tube 107 is a part that is not easily deformable even by the external pressure, the assembly tube 105 and the fitting tube 107 through the automatic assembly line for the assembly of the syringe In the alignment process as well as the aligned adapter tube 105 and the fitting tube 107 is not easily crushed in the process of being inserted into the space portion in the cylinder 101, and thus the adapter tube 105 and the fitting tube ( In the state where the 107 is assembled in the space portion of the cylinder 101, as the stability is maintained at the correct position, the defect rate is lowered as well as the cost burden can be reduced as the conventional assembly line does not have to have a separate complicated additional device. As a result, the unit price of the product can be lowered.

Second, the adapter tube 105 and the fitting tube 107 used for sealing the coupling portion of the needle fixing tube 109 can be easily identified by the naked eye at the pre-assembly stage, so that the defective state component is used. Probability is low, and thus the injection does not leak in the process of using the assembled syringe, so that the patient feels anxiety or does not feel the injection.

Claims (8)

A cylinder having a space portion therein and communicating with one end in front and the other end in an open state is provided, and the space in the cylinder is provided with a push rod so as to be selectively moved forward and rearward along the longitudinal direction of the cylinder. In the front circumferential portion of the push rod, the piston is coupled to provide a compressive force or a suction force while moving together in a hermetic contact with the cylinder during the front and rear movement of the push rod, An adapter tube inserted into a front portion of one of the space portions in the cylinder and in communication with the space portion of the cylinder; An injection liquid discharge tube formed in a state in which the diameter smaller than the diameter of the adapter tube is protruded in the central portion of the front end of the adapter tube and in communication with the inside of the adapter tube; A fitting tube inserted into the inner diameter of the adapter tube to press the adapter tube toward the cylinder while maintaining the adapter tube and the cylinder in an airtight state; A needle fixing tube coupled to the injection liquid discharge tube formed in the adapter tube and fixed with a needle; The center portion of the front end of the push rod is inclined at the rear axial center line, and when the push rod is moved forward for injection, the tip passes through the fitting tube and is located at the inner diameter of the injection liquid discharge tube. And the pressing piece for eccentrically pressurizing a specific portion of the injection pipe discharge, A fitting tube moving means for moving the fitting tube inserted into the adapter tube to the rear when the pushing rod is moved to the rear side after the injection is completed; It is characterized in that it comprises an adapter tube moving means for moving the adapter tube to the rear from any moment when the push tube is pushed toward the rear in the state that the fitting tube inserted in the adapter tube is moved to the rear side Disposable safety syringe. The method of claim 1, Fitting tube means of transport, A first catching jaw formed along the inner diameter of the fitting tube; The first catching protrusion is formed by the first catching protrusion formed in place on the outer diameter portion of the pressing piece, and the first catching protrusion is caught on the first catching jaw when the pressing piece is fitted into the inner diameter portion of the injection liquid discharge pipe through the fitting tube. Disposable safety syringe, characterized in that when the pressing piece is moved together by the rearward movement of the push rod, the first catching projection is caught on the first catching jaw to draw the fitting tube to the rear side. The method of claim 2, When the first locking projection formed on the outer diameter portion of the pressing piece is initially contacted with the fitting tube so that the pressing piece is not stopped by the fitting tube in the process of being fitted into the inner diameter part of the injection liquid discharge tube through the fitting tube as the push rod moves forward. Disposable safety syringe, characterized in that the elastic projections in close contact with the outer diameter portion of the pressing piece. The method of claim 1, The outer tube transportation means, A second locking jaw formed along the circumference of the inner tube, It is composed of a second locking projection formed along the circumference of the fitting tube and the fitting tube is inserted into the inner diameter of the adapter tube so that the second locking protrusion is positioned at the inner diameter of the adapter tube to be spaced apart from the second locking jaw. Disposable safety syringe, characterized in that when the fitting tube is moved together by the rearward movement of the pusher, the second catching projection is caught by the second catching jaw and pulls the outer tube backward. The method according to claim 1 or 4, A tapered first inclined surface is formed around the outer diameter portion of the fitting tube to be in contact with the second catching jaw formed in the outer tube, the taper-shaped first inclined surface being gradually smaller from the rear side toward the front side. Disposable safety syringe, characterized in that the portion of the outer circumference of the fitting tube to be in contact with the rear end of the adapter tube is formed around the periphery of the tapered second inclined surface that the outer diameter becomes smaller gradually from the rear side to the front side. The method of claim 1, A portion of the space inside the cylinder to be fitted with a plurality of fitting grooves are formed so that the rear side is opened at a predetermined interval along the circumference, and the outer diameter portion of the outer tube at a predetermined interval along the circumference And a plurality of fitting protrusions are formed so that the fitting protrusion is inserted into the fitting groove in the state where the adapter tube is inserted into the space portion in the cylinder. The method of claim 1, A semicircular concave groove is formed along the periphery of the rear portion of the outer tube to which the outer tube is to be fitted, and the outer concave portion of the outer tube faces the concave groove when the outer tube is fitted into the inner space of the cylinder. Disposable safety syringe, characterized in that the semi-circular protruding piece is formed along the circumference so that the fitting tube is accommodated in the indentation groove when the fitting tube is fitted into the inner diameter of the adapter tube. The method of claim 1, The piston facing surface, which is the rear end face of the fitting tube, is inclined to be excavated toward the inner diameter portion from the outer diameter side thereof, and the fitting tube facing surface, which is the front end face of the piston, protrudes toward the inner diameter portion from the outer diameter side thereof. Disposable safety, characterized in that in the form of a picture, the piston is moved forwards together by the forward movement of the push rod so that the projecting inclined portion of the piston is accurately accommodated in the inclined inclined portion of the fitting tube syringe.

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