Multifunctional injector convenient to use

Abstract

The utility model discloses a multifunctional injector convenient to use, which comprises an injector needle cylinder, a piston capable of reciprocating in the needle cylinder, a piston rod for pulling the piston to move and a needle head, and is characterized in that a filter device is arranged on the needle cylinder, and the first end of the filter device is communicated with the outlet end of the needle head; the second end of the filtering device is communicated with an inner cavity of the needle cylinder, a filtering body and a liquid passing channel arranged on the side of the filtering body are arranged in the filtering device body, a first one-way valve is arranged at the first end of the liquid passing channel and communicated with the outlet end of the needle head, and a second one-way valve is arranged at the second end of the liquid passing channel and communicated with the inner cavity of the needle cylinder. The first end of the filter body is provided with a third one-way valve and is communicated with the outlet end of the needle head, the second end of the filter body is provided with a fourth one-way valve and is communicated with the inner cavity of the needle cylinder, and the multifunctional injector convenient to use can filter injection liquid and can prevent the piston rod from being polluted easily at the same time.

Description

Technical Field

[0001] This utility model relates to a hospital syringe, and more particularly to a convenient and multifunctional syringe. Background Technology

[0002] Syringes are widely used in the medical industry. With the continuous development of my country's medical industry, the demand for syringes is increasing year by year. Although the structure of traditional syringes is simple, the operation process is cumbersome for nurses. They need to vent air multiple times and cannot avoid debris from entering the liquid, which can easily lead to medical accidents.

[0003] Currently, a Chinese patent, "A Sample Liquid Filtering Syringe with a Filter," with publication number CN206566585U, has been found. It includes a graduated cylinder and a piston rod that matches the cylinder. A needle filter is installed at the outlet end of the cylinder. The cylinder is equipped with a pipette for injecting sample liquid into its inner cavity. The outer wall of the cylinder has a filling port communicating with the inner cavity. The pipette injects sample liquid into the inner cavity of the cylinder through the filling port. While this patent has a simple structure, facilitates sample liquid injection, and reduces spillage and waste, it fails to achieve automatic venting and avoids the problem of the piston rod being easily contaminated.

[0004] Additionally, a Chinese patent, CN111528865B, entitled "A Blood Collection Needle with Automatic Exhaust," was found. This needle comprises, from the outside in, a syringe, a coarse ventilation tube, a fine ventilation tube, a blood collection control device, and a needle core. The blood collection control device includes a lateral limiting component, a directional locking component, and a positioning support component. The lateral limiting component is located on the inner wall of the positioning support component and engages with the needle core. The positioning locking component is located in the lower half of the positioning support component. In the locked state, the positioning locking component locks the positioning support component and the needle core in place. This automatic exhaust syringe fills the gap in automatic venting capabilities, meeting the needs of clinical and research laboratories. However, it cannot filter the injection solution or prevent the piston rod from becoming easily contaminated. Utility Model Content

[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of this utility model is to provide a convenient and easy-to-use multifunctional syringe that can filter the injection liquid while avoiding easy contamination of the piston rod.

[0006] This utility model is achieved through the following technical solution:

[0007] A convenient and multifunctional syringe includes a syringe barrel, a piston capable of reciprocating within the syringe barrel, a piston rod for pulling the piston, and a needle. The syringe barrel is characterized by a filter device; a first end of the filter device is connected to the outlet of the needle, and a second end of the filter device is connected to the inner cavity of the syringe barrel. The filter device contains a filter body and a liquid passage located beside the filter body. A first one-way valve is provided at the first end of the liquid passage and is connected to the outlet of the needle; a second one-way valve is provided at the second end of the liquid passage and is connected to the inner cavity of the syringe barrel; a third one-way valve is provided at the first end of the filter body and is connected to the outlet of the needle; and a fourth one-way valve is provided at the second end of the filter body and is connected to the inner cavity of the syringe barrel. The first and second one-way valves are arranged in the same direction, allowing the injection liquid to flow only from the first end to the second end of the liquid passage; the third and fourth one-way valves are arranged in the same direction, allowing the injection liquid to flow only from the second end to the first end of the filter body.

[0008] Preferably, the first check valve, the second check valve, the third check valve and the fourth check valve all include an annular body and a plurality of leaflets disposed on the first end of the annular body opening. When the outer ends of each leaflet are close to each other, the channel is closed; when the outer ends of each leaflet are far apart, the channel is unobstructed.

[0009] Preferably, the above-mentioned liquid passage has two sets, each set having a third check valve and a fourth check valve.

[0010] Preferably, an exhaust mechanism is provided between the above-mentioned filter device and the outlet end of the needle. The exhaust mechanism includes an exhaust channel communicating with the outlet end of the needle. The inlet end of the exhaust channel is provided with a float that can float and sink depending on the amount of injected liquid. A lever and a sealing gasket fixed on the free end of the lever for sealing the opening and closing of the exhaust channel are fixed on the float.

[0011] Preferably, the sealing gasket is provided with an inner extension tube at the position where the exhaust channel is blocked and disconnected. A spring is sleeved on the outer periphery of the inner extension tube, the sealing gasket, and the lever. The rising and falling of the float causes the sealing gasket to block the opening and closing of the inner extension tube port, thereby realizing the opening and closing of the exhaust channel.

[0012] Preferably, the piston rod is provided with a pressure plate at its tail end, and a retractable plastic hose that is sleeved around the piston rod is connected between the pressure plate and the tail end of the syringe.

[0013] The working principle of this convenient and easy-to-use multifunctional syringe is as follows: When drawing the injection fluid, as the piston rod and piston are pulled to the rear, the injection fluid sequentially passes through the needle, the first one-way valve at the first end of the fluid passage, and the second one-way valve at the second end of the fluid passage before entering the inner cavity of the syringe. During injection, as the piston rod and piston are pushed to the rear, the injection fluid sequentially enters the human body through the inner cavity of the syringe, the fourth one-way valve at the second end of the filter body, the third one-way valve at the first end of the filter body, and the needle. Because the injection fluid is filtered before entering the human body, it avoids the entry of small particles such as debris, thereby improving the safety of syringe use. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the structure of the filtration device of this utility model in one working state;

[0016] Figure 3 This is a schematic diagram of another working state of the filter device of this utility model;

[0017] Figure 4 yes Figure 1 A partial view;

[0018] Figure 5 This is a schematic diagram of the one-way valve in the closed state;

[0019] Figure 6 This is a schematic diagram of the one-way valve in the open state;

[0020] Figure 7 This is a schematic diagram of the exhaust mechanism;

[0021] Figure 8 This is a partial structural diagram of the exhaust mechanism;

[0022] Figure 9 This is a partial structural diagram of the exhaust mechanism (float, lever, and sealing gasket).

[0023] Figure 10 This is a schematic diagram of the exhaust mechanism in its exhaust state. Detailed Implementation

[0024] The present invention will be further explained below with reference to specific embodiments and accompanying drawings.

[0025] This utility model is a convenient and easy-to-use multifunctional syringe, including a syringe barrel 1, a piston 2 that can reciprocate within the syringe barrel 1, a piston rod 3 that pulls the piston, and a needle 4.

[0026] A filter device 5 is provided on the syringe 1, wherein the first end of the filter device 5 is connected to the outlet end of the needle, and the second end of the filter device is connected to the inner cavity 101 of the syringe. The filter device body is provided with a filter body 6 and a liquid passage 7 (which can be one or two sets) located beside the filter body. The liquid passage 7 is relatively independent of the filter body 6. The first end of the liquid passage 7 is provided with a first one-way valve 8 and is connected to the outlet end of the needle. The second end of the liquid passage 7 is provided with a second one-way valve 9 and is connected to the inner cavity of the syringe.

[0027] The first end of the filter body 6 is provided with a third one-way valve 10 and is connected to the outlet end of the needle (that is, the first end of the liquid passage 7 is also connected to the first end of the filter body 6). The second end of the filter body is provided with a fourth one-way valve 11 and is connected to the inner cavity of the syringe (that is, the second end of the liquid passage 7 is also connected to the second end of the filter body 6). The function of the one-way valve is to allow the injection liquid to flow in only one direction. The first one-way valve 8 and the second one-way valve 9 are arranged in the same direction and allow the injection liquid to flow only from the first end of the liquid passage to the second end. The third one-way valve 10 and the fourth one-way valve 11 are arranged in the same direction and allow the injection liquid to flow only from the second end of the filter body to the first end.

[0028] Figure 2 The middle arrow indicates the direction of the injection fluid as the piston moves towards the tail end. Figure 3 The middle arrow indicates the direction of the injection fluid as the piston moves forward.

[0029] The first check valve 8, the second check valve 9, the third check valve 10, and the fourth check valve 11 can be any of the existing types of check valves.

[0030] Specifically, the first check valve 8, the second check valve 9, the third check valve 10, and the fourth check valve 11 of this application all include an annular body 12 and a plurality of leaflets 13 disposed on the first end of the annular body opening. When the outer ends of the leaflets approach each other, the channel is closed; when the outer ends of the leaflets move away from each other, the channel is unobstructed (e.g., ...). Figure 5 , 6 (As shown).

[0031] To achieve the venting function, an venting mechanism 14 is provided between the filter device 5 and the needle outlet. The venting mechanism includes an venting channel 15 communicating with the needle outlet (there may be one or two venting channels 15). The inlet of the venting channel 15 is provided with a float 16 that can float and sink depending on the amount of injection liquid. A lever 17 and a sealing gasket 18 fixed on the free end of the lever 17 for blocking the opening and closing of the venting channel are provided on the float. That is, when the float 16 floats up, it drives the lever 17 and the sealing gasket 18 to block the opening of the venting channel. When the float 16 sinks, it drives the lever 17 and the sealing gasket 18 to disengage from blocking the opening of the venting channel.

[0032] Specifically, an inner tube 19 is provided at the position where the sealing gasket 18 blocks the opening and closing of the exhaust channel. A spring 20 is sleeved around the inner tube 19, the sealing gasket 18, and the lever 17 (this spring helps to restore the sealing gasket's blockage of the exhaust channel). The rising and falling of the float causes the sealing gasket to open and close the port of the inner tube, realizing the opening and closing of the exhaust channel. The function of the spring 20 is to make it easier for the sealing gasket 18 to block the exhaust channel. That is, when the float 16 sinks, it drives the lever 17 and the sealing gasket 18 to disengage from blocking the exhaust channel, and at the same time, the spring 20 bends. At this time, the gas in the syringe can be discharged through the exhaust channel (e.g., Figure 10 (The arrow indicates the direction of gas discharge). When the float 16 rises, under the driving force of the spring 20 returning to its original state and the buoyancy of the float, the lever 17 and the sealing gasket 18 are driven to block the exhaust passage (e.g., Figure 7 (As shown).

[0033] To reduce contamination of the piston rod, a pressure plate 21 is provided at the tail end of the piston rod 3. A retractable plastic hose 22 is connected between the pressure plate 21 and the tail end of the syringe and is sleeved around the piston rod. Because of the retractable plastic hose 22, the user's fingers and other parts can be prevented from contacting the piston rod, thereby preventing the piston rod from being contaminated and ensuring the safety of the syringe.

[0034] The working principle of this convenient and easy-to-use multifunctional syringe is as follows: When drawing the injection fluid, as the piston rod and piston are pulled to the rear, the injection fluid sequentially passes through the needle, the first one-way valve at the first end of the fluid passage, and the second one-way valve at the second end of the fluid passage before entering the inner cavity of the syringe. During injection, as the piston rod and piston are pushed to the rear, the injection fluid sequentially enters the human body through the inner cavity of the syringe, the fourth one-way valve at the second end of the filter body, the third one-way valve at the first end of the filter body, and the needle. Because the injection fluid is filtered before entering the human body, it avoids the entry of small particles such as debris, thereby improving the safety of syringe use.

[0035] The above description is only a preferred embodiment of the present utility model. Without departing from the principle of the present utility model, several improvements and modifications can be made, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A convenient and multifunctional syringe, comprising a syringe barrel, a piston capable of reciprocating within the syringe barrel, a piston rod that pulls the piston, and a needle, characterized in that: The syringe is equipped with a filter device. The first end of the filter device is connected to the outlet of the needle, and the second end of the filter device is connected to the inner cavity of the syringe. The filter device body is equipped with a filter body and a liquid passage located beside the filter body. The first end of the liquid passage is equipped with a first one-way valve and is connected to the outlet of the needle. The second end of the liquid passage is equipped with a second one-way valve and is connected to the inner cavity of the syringe. The first end of the filter body is equipped with a third one-way valve and is connected to the outlet of the needle. The second end of the filter body is equipped with a fourth one-way valve and is connected to the inner cavity of the syringe. The first one-way valve and the second one-way valve are arranged in the same direction and allow the injection liquid to flow only from the first end to the second end of the liquid passage. The third one-way valve and the fourth one-way valve are arranged in the same direction and allow the injection liquid to flow only from the second end to the first end of the filter body.

2. The convenient multifunctional syringe according to claim 1, characterized in that: The first check valve, the second check valve, the third check valve, and the fourth check valve all include an annular body and several leaflets disposed on the first end of the annular body opening. When the outer ends of each leaflet approach each other, the channel is closed; when the outer ends of each leaflet move away from each other, the channel is unobstructed.

3. The convenient multi-functional syringe according to claim 1, characterized in that: The liquid passage has two sets, each set having a third check valve and a fourth check valve.

4. The convenient multifunctional syringe according to claim 1, characterized in that: An exhaust mechanism is provided between the filter device and the needle outlet. The exhaust mechanism includes an exhaust channel communicating with the needle outlet. A float that can float and sink depending on the amount of injected liquid is provided at the inlet of the exhaust channel. A lever and a sealing gasket fixed on the free end of the lever for sealing the opening and closing of the exhaust channel are fixed on the float.

5. The convenient multi-functional syringe according to claim 4, characterized in that: The sealing gasket is equipped with an inner extension tube at the position where the exhaust channel is opened and closed. A spring is sleeved around the inner extension tube, the sealing gasket, and the lever. The rising and falling of the float causes the sealing gasket to open and close the port of the inner extension tube, thereby realizing the opening and closing of the exhaust channel.

6. The convenient multifunctional syringe according to claim 1, characterized in that: The piston rod is provided with a pressure plate at its tail end, and a retractable plastic tube is connected between the pressure plate and the tail end of the syringe and sleeved around the piston rod.

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