Syringe

The present invention relates to a syringe, and more particularly, to an apparatus obtained by improving an conventional syringe formed with an injection flow passage including an injection needle, so as to share a portion of the injection flow passage except the injection needle or to form a suction flow passage completely independent of the injection flow passage, thereby further smoothing suction of a liquid medicine. The syringe is configured such that the separate suction flow passage bypassing the injection needle is formed in an conventional syringe to more smoothly perform the suction of the liquid medicine, thereby maximizing user's convenience and marketability of the product.

TECHNICAL FIELD

The present invention relates to a syringe, and more particularly, to an apparatus obtained by improving an conventional syringe formed with an injection flow passage including an injection needle, so as to share a portion of the injection flow passage except the injection needle or to form a suction flow passage completely independent of the injection flow passage, thereby further smoothing suction of a liquid medicine, wherein the apparatus is configured such that a separate suction flow passage bypassing the injection needle is formed in the conventional syringe to more smoothly perform the suction of the liquid medicine, thereby maximizing user's convenience and marketability of the product.

BACKGROUND ART

In general, a syringe is an instrument for injecting a liquid medicine into a body of an animal/plant and is configured to pierce a skin with a sharp tip thereof to allow the liquid medicine to be injected into any tissue of the body.

FIG. 1is an exploded perspective view illustrating a conventional syringe. As shown inFIG. 1, the syringe generally includes a cylinder20to which an injection needle10is coupled and in which an injection liquid is contained, and a plunger30provided in the cylinder20so as to be movable forward and backward.

In this conventional syringe, as the plunger30is retreated, a negative pressure is generated in the cylinder20and the cylinder is then filled with the injection liquid. As the plunger is moved forward, the injection liquid in the cylinder20is discharged through the injection needle by a positive pressure and then injected into a patient's body.

In use of this conventional syringe, however, if a diameter of the injection needle10is very small, the inside of the cylinder20is in a vacuum state due to the negative pressure but the suction of the liquid medicine is not performed smoothly even though a user retreats the plunger30in order to suck the liquid medicine.

Accordingly, there are problems in that it takes a long time to suck the liquid medicine, which is inconvenient to the user, and furthermore when the user releases the plunger30before the suction of the liquid medicine is completed, the plunger30is advanced by itself in a state where the liquid medicine is not sucked into the cylinder20.

In addition, Korean Patent Publication No. 10-1563723 issued to the present applicant has solved these problems, but it has been pointed out that a filtering injection needle assembly is configured to cause a liquid medicine to pass through a filter mean upon suction of the liquid medicine, resulting in unsmooth suction of the liquid medicine due to the filter means.

PRIOR ART DOCUMENT

DISCLOSURE

Technical Problem

The present invention is conceived to solve these problems, and an object of the present invention is to provide a syringe configured such that a separate suction flow passage bypassing an injection needle is formed in an conventional syringe to more smoothly perform suction of a liquid medicine, thereby maximizing user's convenience and marketability of the product.

Technical Solution

According to the present invention, there is provided a syringe including an injection needle and a cylinder and formed with an injection flow passage extending from the cylinder to the injection needle, wherein the syringe further includes an opening/closing means for selectively opening or closing the injection flow passage; and a suction flow passage formed from a pointed hollow cap to the cylinder and provided with a through-hole formed in any one of the injection needle, a connector for connecting the injection needle to the cylinder, and the cylinder to establish communication between an inside and an outside thereof and a one-way valve means for intermittently controlling opening or closing of the through-hole.

The one-way valve means is preferably opened in response to coupling of the cap and is closed in response to separation of the cap. More specifically, it is preferred that the one-way valve means includes an elastic band having a circular cross-section and configured to surround and elastically seal the through-hole, an engagement ledge formed on an inner peripheral surface of the cap so as to be brought into contact with and move the elastic band in response to an axial movement of the cap, and a groove configured to elastically return the elastic band to a position at which the elastic band hermetically seals the through-hole.

Similarly, the one-way valve means may be opened by a negative pressure applied in the cylinder of the syringe and may be closed by a positive pressure applied in the cylinder of the syringe. More specifically, the one-way valve means may be a known check valve including an elastic flap for selectively opening or closing the through-hole, or the one-way valve means may be a known check valve comprising a sphere for selectively opening or closing the through-hole.

Otherwise, the one-way valve means may be opened or closed depending on a change in alignment of the flow passages in response to a rotation manipulation.

Alternatively, the one-way valve means may include an elastic sealing member fixed to maintain airtightness of the through-hole and a penetration needle configured to penetrate the elastic sealing member, whereby the one-way valve means may be opened in response to insertion of the penetration needle into the elastic sealing member and may be closed in response to separation of the penetration needle from the elastic sealing member.

In addition, it is most preferable that the cap accommodates the opening/closing means to form a portion of the suction flow passage in a space between an outer perimeter of the opening/closing means and an inner perimeter of the cap; and an adhesive material for fixing an needle body and a hub of the injection needle to each other is accommodated in the opening/closing means to be isolated from a liquid medicine.

Advantageous Effects

The syringe of the present invention configured such that a separate suction flow passage bypassing an injection needle is formed in an conventional syringe performs more smooth suction of a liquid medicine, thereby maximizing user's convenience and marketability of the product.

BEST MODE

FIG. 2is a sectional view illustrating a state where a one-way valve means is opened in a first embodiment of a syringe according to the present invention,FIG. 3is a sectional view illustrating a state where the one-way valve means is closed in the first embodiment of the syringe according to the present invention, andFIG. 4is a perspective view exemplarily illustrating an opening/closing means in the first embodiment of the syringe according to the present invention.

Moreover,FIG. 5is a sectional view illustrating a state where another example of the one-way valve means is opened in the first embodiment of the syringe according to the present invention,FIG. 6is a sectional view illustrating a state where the other example of the one-way valve means is closed in the first embodiment of the syringe according to the present invention, andFIG. 7is views illustrating an example in which two one-way valve means are employed in the first embodiment of the syringe according to the present invention, whereinFIG. 7 (a)is a front view andFIG. 7 (b)is a sectional view.

Furthermore,FIG. 8is a sectional view illustrating a state where a further example of the one-way valve means is opened in the first embodiment of the syringe according to the present invention, andFIG. 9is a sectional view illustrating a state where the further example of the one-way valve means is closed in the first embodiment of the syringe according to the present invention.

In addition,FIG. 10is a sectional view illustrating a state where the one-way valve means is externally provided in the first embodiment of the syringe according to the present invention,FIG. 11is a view illustrating a still further example of the one-way valve means in the first embodiment of the syringe according to the present invention, andFIG. 12is a sectional view illustrating a state where the one-way valve means is externally provided and a connector is employed in the first embodiment of the syringe according to the present invention.

FIG. 13is a sectional view illustrating a state where a one-way valve means is externally provided in a second embodiment of the syringe according to the present invention, andFIG. 14is a sectional view illustrating a state where the one-way valve means is externally provided and a connector is employed in the second embodiment of the syringe according to the present invention.

Finally,FIG. 15is a sectional view illustrating an example of a one-way valve means in a third embodiment of the syringe according to the present invention, andFIG. 16is a sectional view illustrating a state where a one-way valve means is internally provided in a fourth embodiment of the syringe according to the present invention.

As shown inFIGS. 2 to 16, a syringe according to the present invention is technically characterized in that a separate suction flow passage bypassing an injection needle is formed in an conventional syringe so as to perform smooth suction of a liquid medicine with a less force, thereby maximizing user's convenience and marketability of a product.

The syringe of the present invention includes an injection needle10and a cylinder20and is formed with an injection flow passage extending from the cylinder20to the injection needle10. The syringe further includes an opening/closing means400for selectively opening or closing the injection flow passage; and a suction flow passage formed from a pointed hollow cap100to the cylinder20and provided with a through-hole formed in any one of the injection needle10, a connector500for connecting the injection needle10to the cylinder20, and the cylinder20to establish communication between an inside and an outside thereof and a one-way valve means300for intermittently controlling opening or closing of the through-hole.

That is, the present invention addresses an issue that a long time or a large force is required to suck the liquid medicine as the liquid medicine is sucked into the cylinder20only through the elongated injection needles10, by additionally providing the opening/closing means400configured to temporarily close the injection needle10upon suction of the liquid medicine and by forming the suction flow passage capable of sucking the liquid medicine without passing through the injection needle10, whereby it is possible to easily and quickly perform the suction of the liquid medicine with a less force.

To this end, in the present invention, the through-hole provided on the suction flow passage is opened by the one-way valve means300upon suction of the liquid medicine, and thus the liquid medicine is easily sucked into the cylinder20of the syringe without passing through the injection needle10and the opening/closing means400closes the injection needle10during this time.

On the contrary, upon injection of the liquid medicine, the through-hole is closed by the one-way valve means300to block the suction flow passage, while as the user removes the opening/closing means400, the injection needle10is opened and the liquid medicine is then injected.

According to embodiments, opening or closing of the one-way valve means300may be adjusted depending on simply whether the cap100is separated, may be automatically adjusted depending on a direction of pressure on the cylinder20, or may be adjusted in response to a user's rotation manipulation. In addition, the one-way valve means may be a pointed penetration needle351for penetrating a soft elastic sealing material350.

In implementing the syringe of the present invention as described above, there may be the following four examples depending on combinations of whether an inlet of the suction flow passage and an outlet of the injection flow passage are coaxially arranged with each other and whether an outlet of the suction flow passage and an inlet of the injection flow passage are shared on the cylinder20of the syringe. These examples will be described below by classifying them into first to fourth embodiments.

First Embodiment

Example in which the inlet of the suction flow passage and the outlet of the injection flow passage are coaxially arranged with each other, and the outlet of the suction flow passage and the inlet of the injection flow passage are shared.

Second Embodiment

Example in which the inlet of the suction flow passage and the outlet of the injection flow passage are not coaxially arranged with each other, and the outlet of the suction flow passage and the inlet of the injection flow passage are shared.

Third Embodiment

Example in which the inlet of the suction flow passage and the outlet of the injection flow passage are coaxially arranged with each other, and the outlet of the suction flow passage and the inlet of the injection flow passage are not shared.

Fourth Embodiment

Example in which the inlet of the suction flow passage and the outlet of the injection flow passage are not coaxially arranged with each other, and the outlet of the suction flow passage and the inlet of the injection flow passage are not shared.

(1) First Embodiment

Example in which the inlet of the suction flow passage and the outlet of the injection flow passage are coaxially arranged with each other, and the outlet of the suction flow passage and the inlet of the injection flow passage are shared.

The first embodiment of the syringe of the present invention may be further classified into an example in which the one-way valve means300is embedded in the syringe and an example in which the one-way valve means300is externally provided.

First, the example of the first embodiment of the syringe according to the present invention in which the through-hole and the one-way valve means300are embedded in the syringe is illustrated inFIGS. 2 to 9.

Particularly, in the first embodiment of the syringe according to the present invention, the example in which the one-way valve means300opens the through-hole in response to coupling of the cap100and closes the through-hole in response to separation of the cap100is shown inFIGS. 2 to 4.

This may be implemented in various ways into the one-way valve being opened or closed by coupling or separating the hollow cap100having a diameter larger than that of the injection needle10in an axial direction of the injection needle10.

In particular, as illustrated inFIG. 2, it is preferable that the one-way valve means300includes an elastic band310having a circular cross-section and configured to surround and elastically seal the through-hole311, an engagement ledge122formed on an inner peripheral surface of the cap100such that the engagement ledge comes into contact with the elastic band310in response to an axial movement of the cap100and moves the elastic band310, and a groove312configured to elastically return the elastic band310to a position at which the elastic band hermetically seals the through-hole.

The suction flow passage consists of a suction needle110of the cap100→a cap hub120of the cap100→the one-way valve means300→a hub12of the injection needle10→the cylinder20.

The cap100is to suck the liquid medicine from a liquid medicine-container, and includes the suction needle110and the cap hub120. A tip of the suction needle110is inclined and pointed to penetrate a vial or the like, and is made of a metal material or a synthetic resin material so that it has a high strength.

In addition, the cap hub120is integrally coupled to and supports the suction needle110, wherein an inner peripheral surface of the cap hub120is coupled to an outer peripheral surface of the hub12that supports a needle body11of the injection needle10.

Here, the needle body11and the hub12of the injection needle10are fixed to each other by an adhesive material13such as epoxy, wherein the hub12is hermetically assembled to the cylinder20of the syringe.

In addition thereto, although the needle body11of the injection needle10is closed by the opening/closing means400upon suction of the liquid medicine, the opening/closing means400is separated to open the needle body11upon injection of the liquid medicine.

In particular, in the present invention, the opening/closing means400may be configured to include a hermetic space410and a flange420as illustrated inFIG. 4.

In other words, the opening/closing means400has functions of closing the needle body11of the injection needle10upon suction of the liquid medicine and of opening the needle body11of the injection needle10upon injection of the liquid medicine. In the present invention, it is preferable that the opening/closing means400can be coupled to the hub12of the injection needle10.

To this end, the hermetic space410is formed at a lower portion of the opening/closing means400so that the hermetic space410may surround and be coupled to the hub12of the injection needle10.

In particular, in the present invention, it is preferable that the adhesive material13for securing the needle body11and the hub12of the injection needle10to each other is accommodated in the hermetic space410of the opening/closing means400, which surrounds the injection needle10to maintain airtightness, so that the adhesive material is isolated from the liquid medicine.

With this configuration, it is possible to prevent degradation of an adhesive force of the adhesive material13due to contact of the adhesive material13with the liquid medicine, or alteration of components of the liquid medicine caused by the adhesive material13.

In addition thereto, the flange420provided in the opening/closing means400enables the opening/closing means400to be secured to the inner peripheral surface of the cap hub120, if necessary.

FIG. 3illustrates that the opening/closing means400is fixedly installed within the cap100so that the opening/closing means400is separated together with the cap100in response to separation of the cap100, thereby opening the injection needle10.

As illustrated inFIGS. 2 and 3, the hub12of the injection needle10is provided with the through-hole311formed to extend from the inner peripheral surface to the outer peripheral surface of the hub, and the groove312is formed on the outer peripheral surface of the hub12along an entire perimeter of the hub around the through-hole311.

The through-hole311may be appropriately changed in number and size such that the liquid medicine may flow smoothly and airtightness may be achieved, and the groove352is formed to have a gently curved surface. The elastic band310made of an elastic material such as rubber having a generally circular cross-section is placed in the groove312.

This elastic band310is elastically disposed in the groove312so that the position of the elastic band may be moved depending on whether the elastic band is in contact with the cap hub120of the cap100.

To this end, the engagement ledge122for contact with the elastic band310is formed on the inner peripheral surface of the cap hub120.

Accordingly, in a state where the cap100is assembled to the injection needle10, as illustrated inFIG. 2, the elastic band310is brought into contact with the engagement ledge122and then moved downward in the figure, so that the through-hole311is opened.

On the contrary, in a state where the cap100is separated from the injection needle10, as shown inFIG. 3, the elastic band310is contracted to its minimum diameter and then rides on the curved surface and is returned to its original position, so that the through-hole311is closed.

As a result, a user enables the one-way valve means300to intermittently control opening or closing of the through-hole311depending on whether the cap100is assembled.

Accordingly, when the liquid medicine is intended to be injected into the body and thus the cap100is simply separated, the injection flow passage consists of the cylinder20→the hub12of the injection needle10→the needle body11of the injection needle10, as shown inFIG. 3.

The opening/closing means400is fixedly installed within the cap100to allow the opening/closing means400to be separated together with the cap100in response to the separation of the cap100, thereby enabling the injection needle10to be opened.

Accordingly, upon suction of the liquid medicine, the liquid medicine is sucked from the cap100into the cylinder through the one-way valve means300, whereas upon injection of the liquid medicine, the liquid medicine is injected from the cylinder20through the opened injection needle10.

As a result, it is possible to quickly suck and then rapidly discharge the liquid medicine, as required.

Although it has been illustrated that the through-hole311is formed in the hub of the injection needle10and the configuration in which the cap100is coupled outside of the elastic band310so as to move the elastic band310has been described above, it is also possible to change the position of the through-hole311.

For example, after the through-hole is formed in the separate connector500for connecting the injection needle10to the cylinder20, the cap100may be coupled to the connector500. Alternatively, after the through-hole is formed directly in the cylinder20of the syringe, the cap100may be coupled to the cylinder20.

That is, there is no limitation on the positions of the through-hole and the one-way valve means300in the present invention.

Next, it is contemplated to employ a one-way valve means300which is opened by a negative pressure applied in the syringe and is closed by a positive pressure applied in the syringe. This one-way valve means may be implemented in various ways as being automatically opened or closed merely depending on the direction of pressure applied in the syringe without a additional manipulation.

Particularly, in the present invention, the one-way valve means300is preferably a well-known check valve including an elastic flap320configured to selectively open or close the through-hole311as shown inFIGS. 5 and 6.

Furthermore, a description of a configuration overlapping with that of the embodiment which employs the one-way valve means300opened or closed depending on whether the aforementioned cap100is coupled will be omitted, and only an operation of the one-way valve means300which is different from that in the embodiment will be described below.

A sealing means600such as a separate elastic seal may be additionally provided between the inner peripheral surface of the cap hub120and the outer peripheral surface of the hub12to prevent the liquid medicine from leaking through a gap therebetween

Even in this case, the suction flow passage consists of the suction needle110of the cap100→the cap hub120of the cap110→one-way valve means300→the hub12of the injection needle10→the cylinder20.

In addition thereto, the one-way valve means300that communicates with the through-hole311and thus is automatically opened or closed depending on the direction of pressure on the liquid medicine is embedded in the hub12of the injection needle10.

As shown inFIGS. 5 and 6, this one-way valve means300may include a circular elastic flap320, which is made of, for example, a flexible material such as silicone, and a stepped portion321.

The elastic flap320is formed to have a diameter corresponding to an inner diameter of the hub12so that a center portion of the elastic flap is assembled and fixed in the hub12, and the stepped portion321is formed above an outer peripheral edge of the elastic flap320so as to limit upward deformation of the elastic flap320.

As a result, upon suction of the liquid medicine, the one-way valve means300is opened while the outer peripheral edge of the elastic flap320is deformed downward as shown inFIG. 5, so that the cylinder20of the syringe is filled with the liquid medicine through the suction flow passage.

Moreover, as shown inFIG. 6, the injection flow passage consists of the cylinder20→the hub12of the injection needle10→the needle body11of the injection needle10.

Since the outer peripheral edge of the elastic flap320in the one-way valve means300is contacted with the stepped portion321to limit upward deformation of the elastic flap320as shown inFIG. 6, the one-way valve means300is closed to prevent the liquid medicine from leaking to the suction flow passage.

Accordingly, upon suction of the liquid medicine, the liquid medicine is sucked from the cap100into the cylinder through the one-way valve means300, and upon injection of the liquid medicine, the liquid medicine is injected from the cylinder20through the injection needle10.

As a result, it is possible to easily perform the injection of the liquid medicine while further smoothly performing the suction of the liquid medicine.

Although the configuration in which the through-hole311and the one-way valve means300are placed in the hub12has been described above by way of example, the through-hole311and the one-way valve means300may be placed in the cylinder20or in the separate connector500for coupling the injection needle10to the cylinder20. In this case, the through-hole311is connected directly to the inside of the cap100.

Moreover,FIG. 7shows that one-way valve means300in the form of an elastic band310and an elastic flap320are formed in a dual configuration. In this case, a first one-way valve means300formed with modified through-holes311and groove312may be provided on the hub12of the injection needle10, and opening or closing of the first one-way valve means300can be controlled depending on whether the cap100is assembled. A second one-way valve means300comprised of the elastic flap320having a modified shape may be provided within the hub12.

As for the second one-way valve means300, the elastic flap320does not require the separate stepped portion, and a generally inclined wing-shaped portion of the elastic flap is brought into direct contact with an inner wall of the hub12depending on the direction of pressure on the liquid medicine, thereby performing the opening or closing of the second one-way valve means300.

As such, it is also possible to configure the syringe by including two or more one-way valve means300.

Next, an example in the first embodiment of the syringe according to the present invention, which employs a one-way valve means300opened or closed by changing alignment of flow passages in response to a user's rotation manipulation, will be described with reference toFIGS. 8 and 9.

Even in this case, the suction flow passage consists of the suction needle110of the cap100→the cap hub120of the cap100→the one-way valve means300→the hub12of the injection needle10→the cylinder20.

The through-hole311which communicates with the inside of the cap hub120is formed in a generally “L” shape in the hub12of the injection needle10, and an opening330is formed in the cylinder20of the syringe to correspond to the through-hole311.

Accordingly, when the cylinder20is rotated and then the opening330and the through-hole311are aligned as shown inFIG. 8, the liquid medicine can be sucked. When the cylinder20is further rotated to release the alignment, the opening330and the through-hole311are not aligned with each other and thus are blocked as shown inFIG. 9, so that a backflow of the liquid medicine to the suction flow passage is prevented upon injection of the liquid medicine.

Although the one-way valve means300has been described as being also placed in the hub12by way of example, the one-way valve means300may be placed in the cylinder20or the separate connector500for connecting the injection needle10to the cylinder20.

Next, an example in the first embodiment of the syringe according to the present invention in which the one-way valve means300is externally provided is illustrated inFIGS. 10 to 12.

Although the examples in which the one-way valve means300is embedded in the cap100or the injection needle10have been described above, a force required for sucking the liquid medicine may be utilized when the liquid medicine passes through the one-way valve means300.

That is, although the one-way valve means300is necessarily designed to be large in size so as to perform suction of the liquid medicine with a smaller force, the one-way valve means300is embedded in an conventional syringe, whereby there is limitation on enlargement of the syringe in size.

Therefore, in the present invention, as shown inFIGS. 10 to 12, the through-hole311may be formed in the cap hub120of the cap100to add an external suction flow passage extending from the through-hole311to the cylinder20of the syringe.

In this way, it is possible to eliminate limitation on the size of the one-way valve means300.

FIG. 10illustrates an example in which the one-way valve means300is separately provided outside.

The one-way valve means300may be variously modified to, for example, a check valve having a sphere illustrated inFIG. 11embedded therein and no limitation on the size thereof, other than the aforementioned examples.

For example, as shown inFIG. 10, the one-way valve means300is a known check valve including the sphere340for selectively opening and closing a flow passage connected to the through-hole311.

The check valve including the sphere340has valve seats341and342on both sides of the movable sphere340, wherein one of the valve seat341is formed to have a cut-out portion so as to allow a flow of the liquid medicine and the opposite valve seat332is configured to contact an outer surface of the sphere340, thereby maintaining airtightness.

As a result, when a negative pressure is applied in the cylinder20of the syringe, the sphere340is moved toward the cut-out valve seat341so that the liquid medicine can flow through the cut-out portion; whereas when a positive pressure is applied in the cylinder20of the syringe, the sphere340is moved toward the valve seat342to maintain airtightness, thereby blocking the flow of the liquid medicine.

In this case, an additional structure for forming a flow passage between the cap100and the cylinder20may be added.

For example, a branch tube may be formed integrally with each of the cap hub120and the cylinder20and the branch tubes of them may be then connected by a flexible tube made of a flexible material to each other. In addition, the branch tubes may be configured to be at certain angles and may also have a well-known configuration enabling selective connection or disconnection of the branch tubes.

In the configuration for disconnecting the tubes from each other, there would no leakage of the liquid medicine only if a state where the one-way valve means300is connected to the cylinder20should be maintained.

Moreover,FIG. 10shows that only the one-way valve means300is externally provided, andFIG. 12shows an example in which the one-way valve means300is externally provided by using the separate connector500.

This connector500may be formed integrally with the cap hub120or the cylinder20, the one-way valve means300may be embedded in the connector500, and there will be no limitation on modification thereof.

(2) Second Embodiment

Example in which the inlet of the suction flow passage and the outlet of the injection flow passage are not coaxially arranged with each other, and the outlet of the suction flow passage and the inlet of the injection flow passage are shared.

Next, the second embodiment of the present invention is a case in which the outlet of the suction flow passage and the inlet of the injection flow passage are shared, whereas the inlet of the suction flow passage and the outlet of the injection flow passage are not coaxially arranged with each other.

To this end, the cap100and the injection needle10are independently placed, and the opening/closing means400is separated from the cap100and is provided to close the injection needle10.

In this case, as shown inFIG. 13, the one-way valve means300is provided on the suction flow passage. The suction flow passage extending from the cap100to the cylinder20may be constructed with the flexible tube, although it will be also possible to configure this suction flow passage to be maintained at a certain angle different from that of the flow passage from the cylinder20to the injection needle10.

Accordingly, the suction flow passage may be formed at one of bodies branched at different angle from the cylinder20, and the injection flow passage may be formed at the other of the bodies.

With this configuration, the liquid medicine is sucked through the cap100in a state where the injection flow passage is closed by the opening/closing means400, whereby the sucked liquid medicine passes through the one-way valve means300and fills the cylinder20, and the liquid medicine to be injected may be discharged to the injection needle10from which the opening/closing means400has been removed.

FIG. 14shows a configuration in which the separate connector500is added, and illustrates the connector500having a perpendicular branch, but the connector may be configured to have a differently angled branch, or it is also preferable to configure the connector to have an angle-adjustable branch. It is also possible to provide the one-way valve means300within the connector500.

Example in which the inlet of the suction flow passage and the outlet of the injection flow passage are coaxially arranged with each other, and the outlet of the suction flow passage and the inlet of the injection flow passage are not shared.

FIG. 15illustrates a case in which the inlet of the suction flow passage and the outlet of the injection flow passage are coaxially arranged with each other as described above, whereas the outlet of the suction flow passage and the inlet of the injection flow passage are not shared.

In this case, the one-way valve means300may be embedded or externally provided as illustrated in the figure.

Even in this case, a branch tube may be formed integrally with each of the cap hub120and the cylinder20and the branch tubes of them may be then connected by a flexible tube made of a flexible material to each other. In addition, the branch tubes may be configured to be at certain angles and may also have a well-known configuration enabling selective connection or disconnection of the branch tubes.

The one-way valve means300may be comprised of a soft elastic sealing material350and a pointed penetration needle351configured to penetrate and be inserted into or to be detachable from the soft sealing material350.

For example, if the cylinder20is provided with the elastic sealing material350such as silicone and the pointed penetration needle351for penetrating the sealing material is also provided separately, in a state where the penetrating needle351penetrates and is placed in the elastic sealing material350as in a vial, for example, the liquid medicine can be sucked into the cylinder20. When the penetration needle351is separated from the elastic sealing material350, an aperture in the elastic sealing material350generated by the penetration of the penetration needle is clogged to prevent the liquid medicine in the cylinder20from leaking through the elastic sealing material350.

Example in which the inlet of the suction flow passage and the outlet of the injection flow passage are not coaxially arranged with each other, and the outlet of the suction flow passage and the inlet of the injection flow passage are not shared.

Finally, the fourth embodiment is a case in which, as shown inFIG. 16, the inlet of the suction flow passage and the outlet of the injection flow passage are not coaxially arranged with each other, and the outlet of the suction flow passage and the inlet of the injection flow passage are not shared.

AlthoughFIG. 16shows the example in which the one-way valve means300is embedded in the cap100, the one-way valve means300may be formed in the flow passage extending from the cap100to the cylinder20or may be provided in the cylinder20.

Again, as described above, the one-way valve means300may be implemented with the elastic sealing material350and the pointed penetration needle351.

As a result, the liquid medicine sucked into the cap100is then sucked into the cylinder20through the one-way valve means300, and the liquid medicine in the cylinder20can be injected into the body via the injection needle10by removing the opening/closing means400.

In this case, the suction flow passage and the injection flow passage are formed completely independently.

Therefore, the syringe of the present invention has great advantages in that by additionally forming the suction flow passage including the cap100so as not to pass through the injection needle10and by adding the opening/closing means400configured to temporarily close the injection needle10, the suction of the liquid medicine is not limited to passage of the injection needle10as in an conventional syringe, so that the suction of the liquid medicine can be smoothly performed with a smaller force.

In addition, there is a great advantage in that by externally providing the one-way valve means300, if necessary, it is possible to more quickly and smoothly suck the liquid medicine without being limited by the size of the one-way valve means300.

The aforementioned embodiments are merely examples for specifically explaining the spirit of the present invention, and the scope of the present invention is not limited to the figures and embodiments.