HK1261460A1 - Syringe - Google Patents

Description

Syringe with a needle

Technical Field

The present invention relates to a syringe, and more particularly, to an apparatus for making a liquid medicine be more smoothly sucked by sharing a part of an injection flow path other than an injection needle or forming a suction flow path completely independent from the injection flow path in a conventional syringe in which an injection flow path including an injection needle is formed, and making the liquid medicine be more smoothly sucked without passing through another suction flow path of the injection needle in the conventional syringe, thereby maximizing user convenience and product merchantability.

Background

Generally, a syringe is a device for injecting a liquid medicine into the body of an animal or plant, and is made to be capable of injecting the liquid medicine into an arbitrary tissue by penetrating the skin with a sharp end.

Fig. 1 is an exploded perspective view illustrating a general syringe, and generally, as illustrated in fig. 1, the syringe is configured by a cylinder 20 to which an injection needle 10 is coupled and which accommodates an injection liquid, and a plunger 30 which is provided in the cylinder 20 so as to be capable of advancing and retreating.

In such a general syringe, the negative pressure is generated in the cylinder 20 as the plunger 30 moves backward, and the medical fluid is filled while the positive pressure is applied to the cylinder 20, and the medical fluid is discharged through the needle 10 and injected into the body of the patient.

However, in the use of such a general syringe, if the diameter of the injection needle 10 is small, even if the user retracts the plunger 30 to suck the medical fluid, the interior of the cylinder 20 is in a vacuum state due to the negative pressure, and the medical fluid is not smoothly sucked.

Such a phenomenon tends to be more serious when applied to a filter for filtering foreign matter such as broken ampoule glass from a chemical solution.

Accordingly, there have been problems in that a large force or a long time is required for the inhalation of the chemical solution, which causes inconvenience to the user, and that if the user releases the plunger 30 before the inhalation of the chemical solution is completed, the plunger 30 is automatically advanced by the negative pressure formed inside the cylinder 20 in a state where the chemical solution is not inhaled into the cylinder 20.

Disclosure of Invention

Technical problem

In order to solve the above problems, the present invention is directed to providing a syringe in which an additional suction flow path is formed without passing through a needle in the existing syringe so that the suction of a medical solution is smoother, thereby maximizing convenience of users and merchantability of products, and such a suction flow path can be forcibly closed by a user's operation at the time of injection.

Technical scheme

The present invention as described above is achieved by an injector including an injection needle and a cylinder, and having an injection flow path from the cylinder to the injection needle, the injector further including: an opening/closing mechanism that selectively closes the injection flow path; a suction flow passage formed from a hollow cap having a tip to the cylinder and including a through hole communicating the injection needle, a connector for connecting the injection needle to the cylinder, and the inside and outside of any one of the cylinders; and a valve mechanism for controlling the opening and closing of the inhalation flow path by a user operation.

Here, the valve mechanism may be configured to be inserted to a predetermined depth across the suction flow passage, and to be formed of a pin having through holes aligned in parallel with the suction flow passage to maintain an open state of the suction flow passage, and the through holes may be separated from the suction flow passage by a depth difference to switch the suction flow passage to a closed state as a tip of the pin protruding outward is pressed.

Similarly, the valve mechanism may be configured to pass through the suction flow path, and maintain an open state of the suction flow path by a rotation pin formed with through holes aligned in parallel with the suction flow path, and the through holes may be separated from the suction flow path by a direction difference to switch the suction flow path to a closed state as a rotation lever formed at a tip end of the rotation pin protruding outward is rotated.

In contrast, it is preferable that the valve mechanism includes a hollow inner body in which the through hole is formed and a tubular outer body having an inner diameter corresponding to an outer diameter of the inner body, so that the open state of the suction flow path is maintained in a state where the outer body is spaced apart from the through hole of the inner body, and the suction flow path is switched to the closed state by closing the through hole formed in the inner body by an inner circumferential surface of the outer body in accordance with relative axial movement of the inner body and the outer body.

In the meantime, the inner body and the outer body may be configured to maintain a closed state of the suction flow passage by interference fit between an outer circumferential surface of the inner body and an inner circumferential surface of the outer body.

Similarly, the inner body and the outer body may be configured to maintain a closed state of the suction flow passage by elastic coupling of unidirectional inclined protrusions formed therebetween.

Further, it is most preferable that the inner body and the outer body are configured to maintain a closed state of the suction flow passage by fastening of threads formed therebetween with one-directional rotation, and to be capable of re-switching the suction flow passage to an open state with reverse rotation.

In this case, it is preferable that the cap accommodates the opening/closing mechanism and a space between an outer periphery of the opening/closing mechanism and an inner periphery of the cap forms a part of the suction flow passage; an adhesive material for fixing the needle body and the needle holder of the injection needle to each other is accommodated in the opening and closing mechanism and isolated from the medical solution; the suction flow path further includes a filter for filtering foreign matter from the chemical solution.

At the same time, it is preferable that the opening and closing mechanism is interference-fitted to the needle holder or fastened by screw.

Preferably, an inclined surface is formed on an inner peripheral surface of the opening/closing mechanism to guide the entry of the injection needle.

ADVANTAGEOUS EFFECTS OF INVENTION

The present invention as described above is an invention in which a separate suction flow path is formed in a conventional syringe without passing through an injection needle, so that a medical solution is more smoothly sucked, convenience of a user and merchantability of a product can be maximized, and such a suction flow path can be forcibly closed at the time of injection.

Drawings

Fig. 1 is an exploded perspective view illustrating a general syringe.

Fig. 2 is a sectional view illustrating a state where the valve mechanism is opened in the first embodiment of the syringe of the present invention.

Fig. 3 is a sectional view illustrating a state where the valve mechanism is closed in the first embodiment of the syringe of the present invention.

Fig. 4 is a perspective view illustrating an opening and closing mechanism in the syringe of the present invention.

Fig. 5 is a sectional view illustrating a state where a valve mechanism is opened in the second embodiment of the syringe of the present invention.

Fig. 6 is a sectional view illustrating a state where the valve mechanism is closed in the second embodiment of the syringe of the present invention.

Fig. 7 is a sectional view illustrating a state of sucking a medical fluid in a third embodiment of the syringe of the present invention.

Fig. 8 is a sectional view illustrating a cap separated state in a third embodiment of the syringe of the present invention.

Fig. 9 is a sectional view illustrating a state where the valve mechanism is closed in the third embodiment of the syringe of the present invention.

Fig. 10 is a sectional view showing a modification of the third embodiment of the syringe of the present invention.

Fig. 11 is a sectional view of a main part illustrating a fourth embodiment of the syringe of the present invention.

Fig. 12 is a diagram illustrating another example of the opening and closing mechanism in the syringe of the present invention.

Description of the symbols

10: injection needle, 11: a needle body, 12: needle seat, 13: adhesive material, 20: cylinder, 30: plunger, 100: cap, 110: suction needle, 120: cap, 200: through-hole, 300: valve mechanism, 310: pin, 311: through hole, 320: rotation pin, 321: through hole, 322: rotating rod, 330: inner body, 340: outer body, 331, 341: unidirectional inclined protrusion, 332, 342: thread, 400: opening and closing mechanism, 410: airtight space, 411: inclined surface, 412: threads, 420: flange, 500: and (3) a filter.

Detailed Description

Fig. 2 is a sectional view illustrating a state in which a valve mechanism is opened in a first embodiment of a syringe of the present invention, fig. 3 is a sectional view illustrating a state in which the valve mechanism is closed in the first embodiment of the syringe of the present invention, and fig. 4 is a perspective view illustrating an opening and closing mechanism in the syringe of the present invention.

In addition, fig. 5 is a sectional view illustrating a state in which a valve mechanism is opened in the second embodiment of the syringe of the present invention, and fig. 6 is a sectional view illustrating a state in which the valve mechanism is closed in the second embodiment of the syringe of the present invention.

Further, fig. 7 is a sectional view illustrating a state of sucking a medical fluid in a third embodiment of the syringe of the present invention, fig. 8 is a sectional view illustrating a state of separating a cap in the third embodiment of the syringe of the present invention, and fig. 9 is a sectional view illustrating a state in which a valve mechanism is closed in the third embodiment of the syringe of the present invention.

Finally, fig. 10 is a sectional view showing a modification of the third embodiment of the syringe of the present invention, fig. 11 is a sectional view showing a main part of the fourth embodiment of the syringe of the present invention, and fig. 12 is a view showing another example of the opening and closing mechanism in the syringe of the present invention.

The specific configurations and functional descriptions of the embodiments of the present invention are merely exemplary for the purpose of describing the embodiments related to the concept of the present invention, and the embodiments related to the concept of the present invention can be implemented in various forms. Further, it should be understood that the present invention is not limited to the embodiments described in the specification, but includes all modifications, equivalents, and alternatives included in the spirit and technical scope of the present invention.

On the other hand, in the present invention, the terms first and/or second, etc. may be used to describe various constituent elements, but these constituent elements should not be limited to these terms. These terms may be used for the purpose of distinguishing one constituent element from another constituent element, and for example, a first constituent element may be named a second constituent element, and similarly, a second constituent element may also be named a first constituent element, without departing from the scope of the claims relating to the concept of the present invention.

When a component is referred to as being "connected" or "connected" to another component, it is to be understood that the component may be directly connected or connected to the other component, but another component may exist therebetween. Conversely, when a component is referred to as being "directly connected" or "directly contacting" another component, it is to be understood that no other component exists therebetween. Other expressions for explaining the relationship between the constituent elements, that is, expressions such as "between … …", "just between … …", or "adjacent to … …", "directly adjacent to … …", and the like, should be interpreted as such.

The terminology used in the description is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Unless the context clearly dictates otherwise, singular expressions include plural expressions. In the present specification, terms such as "comprising" or "having" should be interpreted as specifying the presence of the stated features, integers, steps, actions, elements, components, or groups thereof, as implemented, but not preclude the presence or addition of one or more other features, integers, steps, actions, elements, components, or groups thereof.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As illustrated in fig. 2 to 12, the syringe according to the present invention is technically characterized in that a separate suction flow path is formed in the conventional syringe without passing through the injection needle, so that the medical fluid can be smoothly sucked with a small force, thereby maximizing convenience of users and merchantability of products, and in particular, such a suction flow path can be forcibly closed at the time of injection.

Preferably, the syringe of the present invention includes a needle 10 and a cylinder 20, and an injection flow path is formed from the cylinder 20 to the needle 10, and the syringe further includes: an opening/closing mechanism 400 that selectively closes the injection flow path; a suction flow path formed from a hollow cap 100 having a tip to the cylinder 20, the suction flow path including a through hole 200, the through hole 200 communicating the injection needle 10, a connector for connecting the injection needle 10 to the cylinder 20, and the inside and the outside of any one of the cylinders 20; and a valve mechanism 300 for controlling the opening and closing of the inhalation flow path by a user operation.

That is, the present invention improves the problem that a long time or a large force is required for sucking a drug solution by sucking the drug solution into the cylinder 20 only through the thin injection needle 10, and on the one hand, the present invention further includes an opening and closing mechanism 400 for temporarily closing the injection needle 10 when sucking the drug solution, and on the other hand, forms an inhalation flow path through which the drug solution can be sucked without passing through the injection needle 10 on the injection flow path, thereby enabling the drug solution to be easily sucked in more quickly and easily with less effort.

At the same time, the present invention enables the injection needle 10 to be more easily coupled to the opening and closing mechanism 400 while more reliably closing the valve mechanism 300 and preventing the opening and closing mechanism 400 from being unintentionally separated from the needle holder 12.

Therefore, in the present invention, when the liquid chemical is sucked, the through hole 200 provided in the suction flow path is opened by the valve mechanism 300 so that the liquid chemical is easily sucked into the cylinder 20 of the syringe without passing through the needle 10, and the needle 10 is closed by the opening and closing mechanism 400 during this period.

On the other hand, when injecting the liquid medicine, the through hole is closed by the check valve mechanism 300 to block the inhalation flow path, and the user removes the opening/closing mechanism 400 to open the injection needle 10 and inject the liquid medicine.

At this time, according to an embodiment, the valve mechanism 300 may be converted from the initially opened state to the closed state simply with a pushing operation or a rotating operation by a user.

In implementing the syringe of the present invention as described above, there are 4 examples as follows, which will be described as the first to fourth embodiments, depending on whether the syringe is an open-type or closed-type inhalation flow path and whether the user operates the valve mechanism 300 in a push operation mode or a rotation operation mode.

First embodiment: for the closed type inhalation flow path, an example in which the inhalation flow path is closed by the valve mechanism 300 by a pushing operation of a user

-second embodiment: for the closed type suction flow path, an example in which the suction flow path is closed by the valve mechanism 300 by the rotational operation of the user

-third embodiment: for the open type inhalation flow path, an example in which the inhalation flow path is closed by the valve mechanism 300 by a pushing operation of the user

-fourth embodiment: for the open type inhalation flow path, an example in which the inhalation flow path is closed by the valve mechanism 300 by the rotational operation of the user

Here, the open type suction flow path and the closed type suction flow path will be explained as follows.

First, the suction flow path includes the suction needle 110 of the cap 100 → the cap base 120 of the cap 100 → the valve mechanism 300 → the needle base 12 of the injection needle 10 → the cylinder 20.

In this case, if the position of the valve mechanism 300 in the suction flow path is simply an open space formed between the inner circumferential surface of the cap 100 and the outer circumferential surface of the hub 12, it will be referred to as an open type suction flow path hereinafter, and if the position of the valve mechanism 300 in the suction flow path is a closed conduit formed inside the cap holder 120 of the cap 100, it will be referred to as a closed type suction flow path hereinafter.

The following examples are described in detail.

(1) The first embodiment: for the closed type inhalation flow path, an example in which the inhalation flow path is closed by the valve mechanism 300 by a pushing operation of a user

In the first embodiment of the present invention, as illustrated in fig. 2 and 3, the valve mechanism 300 is inserted to a predetermined depth across the suction flow passage, and is formed of a pin 310 in which through holes 311 aligned in parallel with the suction flow passage are formed to maintain an open state of the suction flow passage, and the through holes 311 are separated from the suction flow passage by a depth difference to switch the suction flow passage to a closed state as the tip of the pin 310 protruding to the outside is pressed.

In this case, the cap 100 is used for sucking a drug solution from a drug solution container, and includes a suction needle 110 and a cap holder 120, and the suction needle 110 has a high rigidity because its tip end is inclined to be able to penetrate a vial or the like and is made of a metal material or a synthetic resin material.

The cap 120 is integrally coupled to support the suction needle 110, and an inner circumferential surface of the cap 120 is coupled to an outer circumferential surface of the hub 12 supporting the needle body 11 of the injection needle 10.

Here, the needle body 11 and the hub 12 of the injection needle 10 are fixed to each other by an adhesive material 13 such as epoxy resin, and at this time, the hub 12 is assembled to the cylinder 20 of the syringe while maintaining airtightness by a general interference fit.

At the same time, the needle body 11 of the injection needle 10 is closed by the opening and closing mechanism 400 when the drug solution is inhaled, and the user separates the opening and closing mechanism 400 to open the needle body 11 when the drug solution is injected.

In particular, in the present invention, as illustrated in fig. 4, the opening and closing mechanism 400 may be configured to include an airtight space 410 and a flange 420.

That is, the opening/closing mechanism 400 functions to close the needle body 11 of the injection needle 10 when the drug solution is inhaled and to open the needle body 11 of the injection needle 10 when the drug solution is injected, and in the present invention, it is preferable that the opening/closing mechanism 400 is capable of being coupled to the hub 12 of the injection needle 10.

Therefore, an airtight space 410 is formed at the lower portion of the opening/closing mechanism 400, and the airtight space 410 can be coupled to wrap the needle holder 12 of the injection needle 10.

In particular, in the present invention, it is preferable that the adhesive material 13 for fixing the needle body 11 and the hub 12 of the injection needle 10 to each other is accommodated in the airtight space 410 of the opening and closing mechanism 400 for covering the injection needle 10 to maintain airtightness, and is isolated from the medical solution.

This prevents the adhesive 13 from coming into contact with the chemical solution to reduce the adhesive strength of the adhesive 13 or prevent the chemical solution from being modified by the adhesive 13.

At the same time, the flange 420 provided in the opening/closing mechanism 400 can fix the opening/closing mechanism 400 to the inner circumferential surface of the cap holder 120 as necessary.

Fig. 3 illustrates that the opening/closing mechanism 400 is fixedly provided inside the cap 100 so that the opening/closing mechanism 400 is separated together with the cap 100, thereby opening the injection needle 10.

At this time, a through hole 200 as a closed type pipe is formed in the cap 100 as a part of the suction flow path, and a pin 310 is inserted to a predetermined depth across the through hole 200.

Such a pin 310 preferably has a polygonal cross section to prevent rotation, as compared with a circular cross section, and through holes 311 aligned in correspondence with the suction flow passages are formed in the pin 310.

As a result, when the through hole 311 of the pin 310 is located at the same depth as the suction flow passage, the suction flow passage is maintained in an open state.

In this regard, when the syringe of the present invention is manufactured, the suction flow path is assembled in an open state as shown in fig. 2.

However, if the pin 310 is inserted as the user presses the end of the pin 310 protruding outward, the through hole 311 of the pin 310 is positioned at a deep position with respect to the suction flow passage as shown in fig. 3, and thus, the through hole 311 is separated from the suction flow passage by such a depth difference to convert the suction flow passage into a closed state.

As a result, the valve mechanism 300, which initially maintains the suction flow path in the open state, can switch the suction flow path to the closed state in accordance with the pushing operation by the user.

For this, a space 12a into which the pin 310 can be further inserted is formed in the hub 12.

Therefore, when the cap 100 is separated and the pin 310 is pressed when the injection is performed to the body, the injection flow path is composed of the cylinder 20 → the needle holder 12 of the injection needle 10 → the needle body 11 of the injection needle 10 as shown in fig. 3.

At this time, the opening/closing mechanism 400 is fixedly provided inside the cap 100 so that the opening/closing mechanism 400 is separated together with the separation of the cap 100 to open the injection needle 10.

Therefore, when the medical fluid is sucked, the medical fluid is sucked from the cap 100 into the cylinder through the valve mechanism 300 which is in the open state, and when the medical fluid is injected, the medical fluid is injected from the cylinder 20 through the opened injection needle 10.

As a result, the liquid medicine can be quickly sucked and then quickly discharged as needed.

The syringe of the present invention can be conveniently used when the medical solution is not injected into the body immediately after the inhalation, for example, when the medical solution is required to be inhaled, and then the medical solution container containing the powdered medical solution is injected with the saline solution to dissolve the powdered medical solution and the powdered medical solution is inhaled again.

(2) Second embodiment: for the closed type suction flow path, an example in which the suction flow path is closed by the valve mechanism 300 by the rotational operation of the user

In the second embodiment of the present invention, as illustrated in fig. 5 and 6, the valve mechanism 300 is disposed across the suction flow channel, and is configured by a rotation pin 320 formed with through holes 321 aligned in parallel with the suction flow channel to maintain an open state of the suction flow channel, and the through holes 321 are separated from the suction flow channel by a direction difference to convert the suction flow channel into a closed state as a rotation rod 322 formed at the tip of the rotation pin 320 protruding to the outside is rotated.

That is, a well-known two-way valve or three-way valve is applied to the second embodiment of the present invention.

In the second embodiment, the same description as that of the first embodiment will be omitted, and only the structure having the difference will be described below.

In the second embodiment, similarly, a through hole 200 as a closed type pipe is formed in the cap 100 as a part of the suction flow passage, and a rotation pin 320 is inserted to a predetermined depth across the suction flow passage.

It is preferable that the rotation pin 320 has a circular cross section so as to be rotatable about an axial center, and through holes 321 aligned in a direction corresponding to the suction flow path are formed in the rotation pin 320.

Meanwhile, a rotation lever 322 for rotating the rotation pin 320 is formed at the protruding end of the rotation pin 320, so that the user can rotate the rotation pin 320 using the rotation lever 322.

As a result, when the through holes 321 of the rotation pin 320 are aligned in the same direction as the suction flow path, the suction flow path is maintained in an open state as shown in fig. 5.

However, when the user rotates the rotation pin 320 using the rotation lever 322, the through hole 321 formed in the rotation pin 320 is positioned in a direction different from the suction flow passage, i.e., in a direction perpendicular to the suction flow passage, and thus the suction flow passage is converted into a closed state as shown in fig. 6 by such a difference in direction.

As a result, the valve mechanism 300, which initially maintains the suction flow path in the open state, can switch the suction flow path to the closed state in accordance with the rotational operation of the user.

Thus, when the cap 100 is separated and the rotating pin 320 is rotated by the rotating lever 322 to inject the injection into the body, the injection flow path is formed by the cylinder 20 → the needle holder 12 of the injection needle 10 → the needle body 11 of the injection needle 10 as shown in fig. 6.

At this time, similarly, the opening/closing mechanism 400 is fixedly provided inside the cap 100 so that the opening/closing mechanism 400 is separated together with the separation of the cap 100 to open the injection needle 10.

Therefore, when the medical fluid is sucked, the medical fluid is sucked from the cap 100 into the cylinder through the valve mechanism 300 which is in the open state, and when the medical fluid is injected, the medical fluid is injected from the cylinder 20 through the opened injection needle 10.

As a result, the liquid medicine can be quickly sucked and then quickly discharged as needed.

The second embodiment has the advantage over the first embodiment that the valve mechanism 300 can be closed and then reopened.

Next, the third and fourth embodiments relate to an open type suction flow path, and the valve mechanism 300 includes a hollow inner body 330 formed with the penetration hole 200 and a tubular outer body 340 having an inner diameter corresponding to an outer diameter of the inner body 330, so that the open state of the suction flow path is maintained in a state where the outer body 340 is spaced apart from the penetration hole 200 of the inner body 330, and an inner circumferential surface of the outer body 340 closes the penetration hole 200 formed in the inner body 330 and converts the suction flow path into a closed state in accordance with a relative axial movement of the inner body 330 and the outer body 340.

(3) The third embodiment: for the open type inhalation flow path, an example in which the inhalation flow path is closed by the valve mechanism 300 by a pushing operation of the user

In the third embodiment of the present invention, as illustrated in fig. 7 to 9, the inner body 330 and the outer body 340 are configured to maintain the closed state of the suction flow passage by interference fit between the outer circumferential surface of the inner body 330 and the inner circumferential surface of the outer body 340.

In the third embodiment, the same description as the first embodiment or the second embodiment will be omitted, and only the structure having the difference will be described below.

In the third embodiment, as a part of the suction flow passage, an open type suction flow passage is formed between the inside of the cap 100 and the outside of the needle holder 12.

In this case, the hub 12 is divided into an inner body 330 and an outer body 340, and the inner body 330 is formed with a plurality of through holes 200 along its circumferential surface.

The diameter and number of the through holes 311 allow the liquid medicine to smoothly flow.

In addition, the inner body 330 and the outer body 340 are respectively formed of hollow bodies such that the inner circumferential surface of the outer body 340 can slide on the outer circumferential surface of the inner body 330.

As a result, the open state of the suction flow path is maintained in a state where the outer body 340 is spaced apart from the through hole 200 of the inner body 330.

On the contrary, as the inner body 330 and the outer body 340 relatively move in the axial direction, the inner circumferential surface of the outer body 340 closes the through hole 200 formed in the inner body 330 to switch the suction flow path to the closed state.

In this case, it is preferable that the outer body 340 is formed with a boss 341 to limit the lower limit height of the inner body 330.

In particular, in the third embodiment, the outer circumferential surface of the inner body 330 and the inner circumferential surface of the outer body 340 are formed to be tapered at a predetermined angle, so that they can be coupled by interference fit when the outer body 340 closes the through hole 200 of the inner body 330.

As a modification of the third embodiment, as illustrated in fig. 10 which is an enlarged view of a portion a of fig. 8, the inner body 330 and the outer body 340 are preferably configured to maintain the closed state of the suction flow channel by elastic coupling of the unidirectional inclined protrusions 331 and 341 formed therebetween.

Fig. 10 (a) shows an open state of the through hole 200 passing through the valve mechanism 300, and fig. 10 (b) shows a closed state of the through hole 200 passing through the valve mechanism 300.

In such a modification of the third embodiment, the inner body 330 and the outer body 340 are coupled to each other by the unidirectional inclined protrusions 331 and 341, thereby more reliably maintaining the state in which the outer body 340 closes the through hole 200 of the inner body 330.

As a result, as shown in fig. 10 (a), when the outer body 340 is disposed to be spaced apart from the through-hole 200 of the inner body 330, the suction flow path is maintained in an open state.

However, when the user simply pushes the inner body 330 in a state where the cap 100 is separated, the one-way inclined protrusions 331 and 341 formed in the inner body 330 and the outer body 340 elastically cross each other, and the through-hole 200 formed in the inner body 330 is closed by the outer body 340 as shown in fig. 10 (b), thereby switching the inhalation flow path to a closed state.

As a result, the valve mechanism 300, which initially maintains the suction flow path in the open state, can switch the suction flow path to the closed state in accordance with the pushing operation by the user.

Therefore, when the cap 100 is separated and the inner body 330 is pressed when the injection is performed into the body, the injection flow path is formed by the cylinder 20 → the needle holder 12 of the injection needle 10 → the needle body 11 of the injection needle 10 as shown in fig. 9.

At this time, similarly, the opening/closing mechanism 400 is provided inside the cap 100 such that the opening/closing mechanism 400 is separated together with the separation of the cap 100 to open the injection needle 10.

Therefore, when the medical fluid is sucked, the medical fluid is sucked from the cap 100 into the cylinder through the valve mechanism 300 which is in the open state, and when the medical fluid is injected, the medical fluid is injected from the cylinder 20 through the opened injection needle 10.

As a result, the liquid medicine can be quickly sucked and then quickly discharged as needed.

(4) The fourth embodiment: example of closing the suction flow path by the valve mechanism 300 by the rotational operation of the user with respect to the open type suction flow path

In the fourth embodiment of the present invention, as illustrated in fig. 11, the inner body 330 and the outer body 340 are configured to maintain a closed state of the suction flow passage by fastening of the screw threads 332 and 342 formed therebetween with one-directional rotation, and to be capable of re-switching the suction flow passage to an open state with reverse rotation.

In the fourth embodiment, the same description as that of the third embodiment will be omitted, and only the structure having the difference will be described below.

As a result, when the outer body 340 is disposed to be spaced apart from the through-hole 200 of the inner body 330, the suction flow path is maintained in an open state as illustrated in fig. 11 (a).

However, when the user rotates the inner body 330 in a state where the cap 100 is separated, the through hole 200 formed in the inner body 330 is sealed by the outer body 340, and thus the inhalation flow path is switched to a closed state as shown in fig. 11 (b).

As a result, as shown in fig. 11 (a), the valve mechanism 300, which initially maintains the suction flow path in the open state, can switch the suction flow path to the closed state in accordance with the rotational operation of the user.

Therefore, when the cap 100 is separated and the inner body 330 is rotated with reference to the outer body 340 when the injection is to be performed to the body, the injection flow path is formed by the cylinder 20 → the needle holder 12 of the injection needle 10 → the needle body 11 of the injection needle 10 as shown in fig. 11 (b).

At this time, similarly, the opening/closing mechanism 400 is fixedly provided inside the cap 100 so that the opening/closing mechanism 400 is separated together with the separation of the cap 100 to open the injection needle 10.

Therefore, when the medical fluid is sucked, the medical fluid is sucked from the cap 100 into the cylinder through the valve mechanism 300 which is in the open state, and when the medical fluid is injected, the medical fluid is injected from the cylinder 20 through the opened injection needle 10.

As a result, the liquid medicine can be quickly sucked and then quickly discharged as needed.

The fourth embodiment has an advantage over the third embodiment in that the valve mechanism 300 can be closed and then re-opened.

Although the above description has been given by way of example of such a valve mechanism 300 being located inside the needle holder 12, such a valve mechanism 300 may be located inside the cylinder 20 or another joint for coupling the injection needle 10 to the cylinder 20.

Further, although the case where the through hole 200 is formed in the hub 12 of the injection needle 10 is exemplified and the case where the hub 12 is divided into the inner body 330 and the outer body 340 is explained, it is obvious that the through hole may be formed in another joint not shown or divided into the inner body and the outer body.

That is, in the present invention, the positions of the through hole 200 and the valve mechanism 300 are not limited.

In this case, an additional structure for forming a flow passage may be added between the cap 100 and the cylinder 20.

For example, the sub-manifolds may be integrally formed on the cap 120 or the cylinder block 20 and then connected to each other by flexible tubes made of a soft material, or the sub-manifolds may be configured to maintain a predetermined inclination angle and may have a known structure that can be selectively connected to and separated from each other.

However, in the structure in which the connection is separated from each other, it is necessary to maintain the state in which the check valve mechanism 300 is connected to the cylinder 20 side, and the chemical liquid does not flow out.

In this case, the joint may be integrally formed with the cap 120 or the cylinder 20, or the valve mechanism 300 may be incorporated in the joint, and the change and application thereof are not limited.

Incidentally, in the present invention, the cap 100 accommodates the opening and closing mechanism 400 and a part of a suction flow passage is formed by a space between an outer periphery of the opening and closing mechanism 400 and an inner periphery of the cap 100; an adhesive material 13 for fixing the needle body 11 and the hub 12 of the injection needle 10 to each other is accommodated in the opening/closing mechanism 400 so as to be isolated from the medical fluid; the suction flow path is preferably further provided with a filter 500 for filtering foreign matters from the chemical solution.

That is, as shown in fig. 12, a filter 500 for filtering foreign matters contained in the chemical solution may be added to the flange 420 of the opening/closing mechanism 400.

Since the filter 500 is not directed to the injection channel but only to the inhalation channel, foreign matter such as ampoule fragments included in the drug solution is filtered at the time of inhalation of the drug solution and then discarded together with the opening/closing mechanism 400, and there is no case where foreign matter filtered by the filter 500 is re-injected.

Additionally, in the present invention, as illustrated in fig. 12, it is preferable that the opening and closing mechanism 400 is interference-fitted to the hub 12 or fastened by a screw 412.

This is to prevent the opening/closing mechanism 400 from being accidentally separated from the needle holder 12 when, for example, the saline solution is inhaled, the saline solution is injected into the drug solution container containing the powdered drug to dissolve the powdered drug, and the drug is then inhaled again.

At the same time, as illustrated in fig. 12, it is preferable that a slope 411 is formed on the inner peripheral surface of the opening/closing mechanism 400 to guide the entry of the injection needle 10, and when the opening/closing mechanism 400 is covered on the injection needle 10, the slope 411 guides the tip of the injection needle 10.

Therefore, the syringe of the present invention has a great advantage that the medical fluid can be smoothly sucked with a small force because the medical fluid is not confined to the needle 10 as in the conventional art by additionally forming the suction flow path including the cap 100 so as not to pass through the needle 10 and by adding the opening and closing mechanism 400 for temporarily closing the needle 10.

Further, the valve mechanism 300 formed in the middle of such a suction flow channel can be easily forcibly closed in accordance with a pushing operation or a rotating operation by a user, so that it is possible to prevent the outflow of the medical fluid at the time of injection in case of chance.

The above embodiments are examples for specifically explaining the technical idea of the present invention, and the scope of the present invention is not limited to the above drawings or embodiments.

Industrial applicability of the invention

The present invention as described above is an invention in which a separate suction flow path is formed in a conventional syringe without passing through an injection needle, so that a medical solution is more smoothly sucked, convenience of a user and merchantability of a product can be maximized, and such a suction flow path can be forcibly closed at the time of injection.

Claims (10)

1. A syringe including an injection needle and a cylinder, and having an injection flow path formed from the cylinder to the injection needle, the syringe characterized by comprising:

an opening/closing mechanism that selectively closes the injection flow path;

a suction flow passage formed from a hollow cap having a tip to the cylinder and including a through hole communicating the injection needle, a connector for connecting the injection needle to the cylinder, and the inside and outside of any one of the cylinders; and

and a valve mechanism for controlling the opening and closing of the inhalation flow path by a user operation.

2. The syringe of claim 1,

the valve mechanism is inserted with a predetermined depth across the suction flow passage, is formed of a pin having through holes aligned in parallel with the suction flow passage, maintains an open state of the suction flow passage, and is configured such that the through holes are separated from the suction flow passage by a depth difference as the end of the pin protruding outward is pressed, thereby switching the suction flow passage to a closed state.

3. The syringe of claim 1,

the valve mechanism is disposed across the suction flow passage, and is configured by a rotation pin formed with through holes aligned in parallel with the suction flow passage to maintain an open state of the suction flow passage, and the through holes are separated from the suction flow passage by a difference in direction to convert the suction flow passage into a closed state as a rotation rod formed at a tip of the rotation pin protruding outward is rotated.

4. The syringe of claim 1,

the valve mechanism includes a hollow inner body formed with the through hole and a tubular outer body having an inner diameter corresponding to an outer diameter of the inner body, so that an open state of the suction flow passage is maintained in a state where the outer body is spaced apart from the through hole of the inner body, and an inner circumferential surface of the outer body closes the through hole formed in the inner body to convert the suction flow passage into a closed state in accordance with relative axial movement of the inner body and the outer body.

5. The syringe of claim 4,

the inner body and the outer body are configured to maintain a closed state of the suction flow passage by interference fit between an outer circumferential surface of the inner body and an inner circumferential surface of the outer body.

6. The syringe of claim 4,

the inner body and the outer body are configured to maintain a closed state of the suction flow passage by elastic coupling of unidirectional inclined protrusions formed therebetween.

7. The syringe of claim 4,

the inner body and the outer body are configured to maintain a closed state of the suction flow passage by fastening of threads formed therebetween with unidirectional rotation, and to be able to convert the suction flow passage into an open state again with reverse rotation.

8. The syringe of any one of claims 2 to 4,

the cap accommodates the opening and closing mechanism and a part of a suction flow passage is formed by a space between an outer periphery of the opening and closing mechanism and an inner periphery of the cap;

an adhesive material for fixing the needle body and the needle holder of the injection needle to each other is accommodated in the opening and closing mechanism and isolated from the medical solution;

the suction flow path further includes a filter for filtering foreign matter from the chemical solution.

9. The syringe of claim 8,

the opening and closing mechanism is in interference fit with the needle seat or fastened through threads.

10. The syringe of claim 8,

an inclined surface is formed on the inner peripheral surface of the opening/closing mechanism to guide the entry of the injection needle.