WO2024195959A2 - Disposable syringe - Google Patents

Abstract

The present invention provides a disposable syringe comprising: a body part including a cylinder that is filled with an injection; and a plunger part inserted into the cylinder, wherein the plunger part comprises an internal plunger inserted into the cylinder to slide therein and an external plunger coupled to the outer surface of the cylinder to slide thereon, and comprises a thumb press bar connecting an end of the internal plunger and an end of the external plunger to each other.

Description

disposable syringe

The present invention relates to a disposable syringe.

Since injections can quickly exert their effects by injecting liquid into the body's tissues, the structure of the syringe has not changed from the past to the present. Since the injection involves inserting a needle into the body and performing the procedure, the person receiving the injection must endure needle pain and phobia, and the person administering the injection cannot help but be careful considering the person receiving the injection.

A syringe consists of a cylinder to hold the liquid, a piston to suck up or push out the liquid, a plunger to move the piston, and a needle to inject the drug in liquid form. The shape of the syringe is such that the plunger (piston) is inserted lengthwise into the syringe (cylinder), and the plunger is exposed slightly longer than the syringe, so it is long in the lengthwise direction, and the action of pressing or pulling the plunger can also move in the lengthwise direction of the syringe.

When aspirating liquid into a cylinder, hold the ampoule or vial and the syringe body (300) with one hand and hold the syringe (100) with the other hand, insert the needle into the ampoule or vial, change the position of the hand and pull the thumb press (25) to aspirate liquid, and when air enters the cylinder, change the position of the hand and push the plunger.

At this time, the structure of the syringe is elongated in the longitudinal direction, and the movement of pulling the plunger to make the plunger longer in the longitudinal direction and the posture of changing hands when pulling the plunger become unnatural, and the syringe may shake due to the instability of the posture during operation of the syringe, which may cause injection pain to the injection target.

Additionally, since injection procedures involve injecting liquid while the needle is inserted into the body, the injection procedure may be difficult for those who are afraid of needles or sensitive to needle pain.

In this way, if the position of the hand changes while holding the syringe, inserting the needle, aspirating the liquid, adjusting the dose, or removing the air due to lack of experience with injections and the size of the hand, or if the syringe shakes due to postural instability, pain caused by the needle may increase, mistakes may be caused by complex step-by-step movements, and the injection time may become longer.

In particular, with the recent repeated mass vaccination against COVID-19, fatigue accumulates in the hands of the person administering the injection, and the workload of female nurses increases.

Prior art literature: (Patent literature 1) Republic of Korea registered patent no. 10-2323530

One aspect of the present invention is to provide a syringe that enables injection with a simpler operation by shortening the process of needle insertion, injection fluid aspiration, and injection into a single operation by pushing or pulling a plunger moving part with a thumb or index finger while holding the syringe to move the piston, thereby solving the above-described problem.

A syringe according to one aspect of the present invention is a disposable syringe including a body part including a syringe barrel filled with an injection liquid and a plunger part inserted into the body part,

The above-mentioned plunger includes an inner plunger that is inserted and slidably inserted into the interior of the syringe, an outer plunger that is coupled to the outer surface of the syringe and slidably inserted, and a thumb presser to which one end of the inner plunger and one end of the outer plunger are respectively connected.

At this time, it is preferable that the external plunger include a plunger moving part that can move the plunger by pushing or pulling with a finger at the other end, and the outer surface of the syringe may include a protruding rail for slidingly moving the external plunger.

It is preferable that the above-mentioned plunger has a recessed surface curved in the shape of the outer surface of the syringe barrel on its lower surface and includes a projection groove that is fitted into the projection rail, and the syringe barrel may include a finger rest, which is a rim portion that is bent outward at an open end.

The above finger rest is preferably provided with a guide groove through which the external pressing member penetrates in one area, so that when the external pressing member slides and moves, the guide groove can fix the external pressing member without it coming off, and the external pressing member is preferably structured to have a reinforced cross-section having an “H” shape.

The disposable syringe of the slide type according to the present invention can increase the convenience of the user by changing the position of applying force to the side of the syringe when pushing or pulling the piston, so that the posture of holding the syringe does not have to be changed during the injection, and the procedure of drawing liquid into the cylinder and removing air while holding the syringe is simplified, so that the preparation time for the injection is reduced.

In addition, since the posture of holding the syringe is stable, the plunger can be moved precisely with the thumb or index finger, which is advantageous in releasing air, controlling the suction amount, controlling the injection amount, and controlling the injection speed and force.

By using the same finger to push and pull the piston, the syringe can be held stably without changing the posture, and the piston can be moved with the thumb or index finger depending on the state of the syringe hold, so that needle insertion and liquid injection can be performed in one motion, allowing for easy and quick injections.

In addition, when using the syringe of the present invention, the structure of the syringe enables injection of the liquid at the same time as the needle is inserted, prevents unnecessary shaking of the syringe, reduces injection pain, and makes it easy to insert the needle and inject the injection liquid at the same time with one hand for people and animals who suffer from injection phobia, which accounts for up to 10% of the population, and are sensitive to injection procedures, so that when an emergency occurs during the injection procedure, it is advantageous in dealing with the emergency with the other hand.

In addition, since the injection time is shortened, the psychological burden of injections is reduced, and since the syringe can be handled more easily, it has the effect of providing confidence in injections.

In addition, since it can be injected using a simple method of use, it has the effect of reducing hand fatigue when injecting, and is particularly advantageous in cases of mass repeated injections such as COVID-19 vaccination.

Furthermore, since the slide-type syringe according to the present invention can be easily manufactured as a disposable syringe like a conventional syringe, no washing work for reuse is required, user convenience is guaranteed, and it also has the effect of being simple to manufacture.

Figure 1 is a component diagram of a disposable syringe according to the present invention.

Figure 2 is a side view and a back view of a disposable syringe according to the present invention.

FIG. 4 is a drawing showing a state in which a piston part according to an embodiment of the present invention is inserted into a syringe.

Figure 5 is a drawing showing an internal and external seal having a reinforcing structure.

(Explanation of symbols)

100 : Slide Syringe

200 : Needle part

300 : Torso

400 : Piston part

500 : Millet

1 : Needle

2 : Herb

3 : Female screw

4 : outlet

5 : Male screw

6: Funnel section

7 : Syringe

8: Inside the cylinder

9 : Scale

10: Spike rail

11 : Guide Home

12 : Finger rest

13 : Insert

14 : Piston head

15 : Piston ring

16 : The stumbling block

17: Piston connection

18 : Pull surface

19: Millet Moving Unit

20 : Wheat noodles

21 : Push plate

22: External pressure

23: Internal seal

24: Reinforcement structure

25 : Thumb press

26 : Dotted Home

27 : Free space

28: Contact point 1

29: Contact point 2

Hereinafter, the present invention will be described in detail with reference to embodiments. In describing the present invention, if it is judged that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description will be omitted.

Also, in describing components of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only intended to distinguish the components from other components, and the nature, order, or sequence of the components are not limited by the terms. When it is described that a component is "connected," "coupled," or "connected" to another component, it should be understood that the component may be directly connected or connected to the other component, but another component may also be "connected," "coupled," or "connected" between each component.

Also, when it is said that a component such as a layer, film, region, or plate is "on" or "over" another component, it should be understood that this includes not only the case where it is "directly over" the other component, but also the case where there is another component in between. Conversely, when it is said that a component is "directly over" another part, it should be understood that it means that there is no other part in between. Also, when it is said that it is "on" or "over" a reference part, it means that it is located above or below the reference part, and does not necessarily mean that it is located "above" or "over" the direction opposite to gravity.

Additionally, in describing the present invention, when it is said that a part "includes" a certain component, this does not exclude other components unless specifically stated otherwise, but rather means that other components can be further included.

In addition, when describing the present invention, the term "planar" means when the target portion is viewed from above, and the term "cross-sectional" means when the cross-section cut vertically through the target portion is viewed from the side.

Hereinafter, the present invention will be described in more detail with reference to the drawings. Fig. 1 is a component diagram of a disposable syringe according to the present invention, Fig. 2 is a side view and a back view of a disposable syringe according to the present invention, and Fig. 3 is an exploded view of the disposable syringe according to the present invention. According to these, the disposable syringe includes a needle portion (200), a body portion (300), a piston portion (400), and a plunger portion (500).

The needle part (200) includes a needle (1), a hub (2), and a female screw (3), and is a Luer lock type formed by screw-connecting the hub (2) to which the needle (1) is connected with the discharge part (4) of the body part (300), but can also be applied to Normal Slip-tips, Catheter tips, Eccentric Tips, Insuline syringes, etc.

The body part (300) includes a discharge port (4), a male screw (5), a funnel part (6), a syringe barrel (7), a scale (9), a projection rail (10), a guide groove (11), a finger rest (12), and an insertion part (13). The body part (300) has a male screw (5) formed in the discharge port (4) at the front and coupled with the female screw (3) of the needle part (200), and an internal seal (23) coupled with a piston part (400) is inserted into the insertion port (13) at the rear of the syringe barrel (7), so that the piston (15) can be pulled or pushed to inject or eject liquid.

When the piston (15) described later is pushed while the liquid is being sucked, the liquid receives longitudinal pressure and moves from the cylindrical cylinder, which is a syringe, to the funnel part (6), and is then injected along the needle tube of the needle (1) through the discharge port (4). It is preferable that the shape of the funnel be a curved shape to reduce resistance to pressure from the end of the cylinder to the discharge port (4).

The protrusion rail (10) installed on the outside of the syringe (7) can be connected in the longitudinal direction from the section where the scale (9) is marked to the finger rest (12). At this time, the protrusion rail (10) is a rail that protrudes and extends from the outer surface of the syringe, and a protrusion groove is fitted therein as described later.

The finger rest (12) is a rim portion that is bent outward from the open end of the syringe barrel, and a guide groove through which an external plunger can pass is provided in one area of the finger rest rim portion.

The piston part (400) includes a piston head (14), a piston (15) at the tip made of a soft material, and a catch (16).

When pushing the piston (15) while the liquid is being sucked in using a syringe, the pressure applied to the piston increases as it approaches the end of the cylinder. This is because the pressure generated when the liquid is injected through a relatively small syringe needle tube compared to the inner diameter of the cylinder and the frictional force between the piston and the cylinder are applied, and the sum of the pressure and the frictional force becomes the discharge pressure.

At this time, the size of the pressure applied by the piston (15) can be expressed as the sum of the frictional force that appears as the area that comes into contact with the inside of the cylinder (8) increases and the frictional force that appears as the contact force between the inner wall of the cylinder and the piston when the diameter of the piston is longer than the length of the inner diameter of the cylinder.

Accordingly, the force applied to the plunger increases as the inner diameter of the needle decreases, the outer diameter of the piston increases, the viscosity of the liquid increases, and the frictional force of the piston increases. As a result, fatigue accumulates in the hand in order to maintain the force applied to the plunger for the injection.

In order to reduce the repulsive force acting on the plunger, the shape of the section extending from the end of the cylinder to the discharge port (4) is a recessed shape in the form of a funnel (6), and the shape of the piston head (14) protrudes to match the shape of the funnel (6) of the syringe (7), and when the piston (15) is pushed and approaches the discharge port (4), the piston head (14) is structured to be in close contact with the space in the shape of the cylinder funnel (6).

That is, when the piston head is pushed to the vicinity of the discharge port, the pressurized liquid is induced to escape through the discharge port (4) while receiving an equal pressure at the funnel (6) portion, thereby reducing the discharge pressure. At this time, it is preferable to limit the contact surface where the piston circumference touches the cylinder to one or more and three or fewer.

Fig. 4 is a detailed drawing showing an example of a portion where a piston part is inserted into a syringe. According to this, the piston contact is provided with a contact surface 1 (28) and a contact surface 2 (29), and it is preferable to configure it in a range where the gap between the contact surfaces is relatively narrow in terms of the area that comes into contact with the inner surface of the cylinder, but does not interfere with liquid suction.

In addition, by making the inner diameter of the piston such that it has a sealing force that does not interfere with the suction of the liquid within the allowable range for the piston to enter the inner diameter of the cylinder, the frictional force represented by the sealing force of the piston is reduced, thereby reducing the discharge pressure and reducing finger fatigue.

The push rod (500) includes a piston connection (17), a pulling surface (18), a push rod moving portion (19), a pushing surface (20), a pressing plate (21), an external push rod (22), an internal push rod (23), a reinforcing structure (24), and a thumb press rod (25).

The plunger is a structure in which the ends of two plungers, that is, the outer plunger and the inner plunger, are both connected to the thumb press, and when the body and plunger are combined and operated, the inner plunger is inserted into the interior of the syringe and slides, and the outer plunger is connected to the outer surface of the syringe and slides.

The outer plunger (22) is provided with a plunger moving part at the end, and the plunger moving part is a part that can move the plunger by pushing or pulling with a finger. The bottom surface is provided with a recessed surface curved to the shape of the outer surface of the syringe barrel, and it is also preferable to provide a projection groove that fits into a projection rail installed on the outer surface of the syringe barrel to prevent the outer plunger from coming off.

That is, when the projection groove (26) installed at the bottom of the push rod moving part (19) is fitted into the projection rail (10), the projection of the push rod rail is fitted into the projection groove, thereby preventing the external push rod from coming off.

In addition, the pressing plate can prevent slippage when pushing the pressing part with a finger by embossing the part where the fingerprint touches the surface of the syringe, and can increase the frictional force between the part where the fingertip touches the pressing surface and the pressing plate, thereby stably maintaining the force to push the pressing part.

In addition, the external push rod is provided in one area of the finger rest (12), and when the external push rod (22) passes through the guide groove (11) and moves in the longitudinal direction, the guide groove (11) holds the side of the external push rod (22).

The outer seal (22) is designed to maintain a horizontal cantilever shape from the thumb press (25) so that the indentation surface is maintained in a state of being attached to the projection rail (10), so that its shape can be maintained, and it is preferable that the outer seal (22) be made of a material with excellent elastic recovery so that the shape can be restored even if it is deformed by applying force.

In addition, in order to apply force to the push rod to move the piston (15), finger force is used, and since the method of applying force and the contact point are different when pulling or pushing with a finger, the push rod (19) is formed in a plate shape in the form of a protruding mallet, and is configured to advantageously apply force across the pulling surface (18) with the finger when pulling, and to advantageously apply force by having the finger tip touch the pushing surface (20) when pushing.

That is, when the syringe (100) is held in a cutter knife grip manner, the body (300) is lightly held with the fingers other than the thumb and wrapped around with the thumb. At this time, the position of the thumb is in contact with the plunger moving part (19), so the structure is advantageous for transmitting the power of the thumb.

When the thumb touching the plunger moving part (19) is applied to push or pull the external plunger (22), the external plunger (22) is exposed to the surface of the syringe (7) and moves, and the internal plunger (23) moves inside the cylinder (8). The fingertips can be spread wide enough so that the external plunger moves on the surface of the syringe while holding the syringe without being obstructed, and the internal plunger (23) can move within the cylinder, so it is not obstructed while holding the syringe.

In addition, when applying force to the plunger (19) with the thumb, the other fingers and the palm hold the syringe body, so that the force can be balanced in the opposite direction to the force applied by the thumb, thereby keeping the syringe stable without shaking.

Meanwhile, when the piston is pressed most closely to the inside, it is desirable that the gap between the piston (15) end and the plunger moving part (19) be A. This is to facilitate the thumb press (25) of the external plunger (22) to be pushed through the guide groove (11) of the wing of the finger rest (12) by slightly spreading the external plunger (22) while the piston (15) is inserted into the insertion port (13) of the syringe (7) when combining the body part (300) and the plunger part (500).

In addition, when pushing or pulling the plunger (19) with a finger while holding the syringe, the structure is designed to be advantageous for the finger to touch and move the plunger (19) by moving it back a certain distance from the part holding the syringe so that the thumb or index finger can naturally touch the plunger (19). This is to advantageously move the plunger (19) while looking at the scale engraved on the surface of the syringe.

The inner seal (23) is connected to the piston (15), and the piston (15) is in close contact with the inner surface of the cylinder (8) and can push or suck liquid as it moves. When the seal moving part (19) is pushed, the entire sealing part (500) moves, and accordingly, the inner seal also moves. That is, when the seal moving part (19) is pushed, the force that is applied in the longitudinal direction to the outer sealing part (22) is transmitted to the inner sealing part (23) in the shape of a “U” through the finger rest (12). At this time, bending may occur in the outer sealing part (22) and the finger rest (12).

Accordingly, as illustrated in FIG. 5, the inner seal may be reinforced in a cross shape like the structural reinforcement of an existing syringe, and it is preferable that the outer seal have a reinforcing structure. It is preferable that the outer seal (22) be reinforced in an "H"-shaped structure in cross section, and the structural reinforcement forms of the finger rest (12) and the thumb presser (25) may be reinforced so as to have less deformation due to twisting and bending due to force transmission while keeping the manufacturing process simple by making them thicker than the existing thumb presser. At this time, it is preferable that the H shape has a lower height than its width.

Meanwhile, a scale (9) is displayed on the top of the syringe (7), and the interval between the point where the scale starts and the limit point can be displayed as a valid section. At this time, when moving the plunger (19) with the thumb or index finger, it can be moved once or more times within the valid section.

When moving the piston within the valid range, the posture of the hand holding the syringe can be maintained even when pulling or pushing the plunger (19) with the finger while maintaining a stable grip on the syringe, so the finger can be moved stably and the syringe does not shake or become loose.

The inner seal (23) can be reinforced in a cross shape like the structural reinforcement of an existing syringe, and the outer seal (22) can be reinforced in an "H" shape with a wide upper part and narrow width in the longitudinal direction, and the thickness of the finger rest (12) is increased for reinforcement, and the structural reinforcement of the thumb presser (25) is made thicker than the existing thumb presser, so that the productivity of the syringe is less affected, while the stability against twisting and bending due to force transmission is reinforced.

The material of the syringe described above is explained. The syringe according to the present invention uses various types of polymers like the existing disposable syringe, and in the case of the disposable syringe, a highly transparent polymer that can be sterilized with gamma rays for sterilization is preferable as the syringe material.

The material of the syringe or needle hub is preferably a material containing polypropylene (PP) that has excellent mechanical properties and good slipperiness for use as a syringe, considering price, manufacturing method, and biological stability. In addition, if greater transparency of the syringe or needle hub is required, it is preferable to use highly transparent polypropylene for the syringe.

The filament should have excellent mechanical properties, such as strength and heat resistance, that are relatively superior to other polymer materials, and it is desirable to be made of a material including polycarbonate to ensure biological stability as a medical device.

In the case of the plunger, unlike the syringe, high transparency is not required, and since a deformation force such as twisting is applied by the force applied to the plunger, it is preferable to use a material including a polycarbonate-based polymer with excellent mechanical strength, and for the suction port located at the end of the plunger inserted into the syringe, it is preferable to use a material in which carbon black is added to ethylene-propylene rubber (EPA) for packing and visibility inside the syringe.

A disposable syringe according to the present invention having the components described above can be combined, for example, in the following manner.

First, the needle part (200) is attached to the syringe outlet (4), and the piston (15) connected to the internal seal (23) is inserted into the insertion part (13) of the syringe (7).

Next, the plunger moving part (19) of the external plunger (22) is passed through the wing guide groove (11) of the finger rest (12) of the syringe end by hand while spreading it upward, and the groove (26) at the bottom of the plunger moving part (19) is inserted into the protrusion rail (10) formed as a line segment on the upper part of the syringe barrel (7), so that the external plunger (22) is restored to its original shape and maintained in a state of being coupled to the protrusion groove (26) inserted into the protrusion rail (10).

In this way, when the above-described components are combined and force is applied to the push rod moving part (19) to push or pull, the external push rod moves along the groove and the piston also moves together.

The above description is merely an example of the present invention, and those skilled in the art will appreciate that various modifications may be made without departing from the essential characteristics of the present invention. Accordingly, the embodiments disclosed in this specification are not intended to limit the present invention, but rather to explain it, and the spirit and scope of the present invention are not limited by these embodiments. The scope of protection of the present invention should be interpreted by the following claims, and all techniques within a scope equivalent thereto should be interpreted as being included in the scope of the rights of the present invention.

Claims (7)

A disposable syringe comprising a body part including a syringe filled with a syringe solution and a plunger part inserted into the body part, The above-mentioned plunger includes an inner plunger that is inserted and slid into the interior of the syringe barrel, and an outer plunger that is coupled to the outer surface of the syringe barrel and slid. A disposable syringe including a thumb press to which one end of the inner seal and one end of the outer seal are respectively connected. In the first paragraph, A disposable syringe having an external plunger and a plunger moving part capable of moving the plunger by pushing or pulling with a finger at the other end. In the second paragraph, A disposable syringe including a protruding rail on the outer surface of the syringe to allow the outer plunger to slide. In the third paragraph, A disposable syringe having a recessed surface curved in the shape of the outer surface of the syringe barrel on the lower surface of the above-mentioned plunger and including a projection groove that is fitted into the projection rail. In paragraph 4, The above syringe is a disposable syringe including a finger rest, which is a rim portion that is bent outward from the open end. In paragraph 5, A disposable syringe in which the finger rest has a guide groove through which the external plunger penetrates in one area, and when the external plunger slides and moves, the guide groove fixes the external plunger so that it does not come off. In Article 6, A disposable syringe having the outer seal reinforced with a cross-section having an “H” shape.

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