Special injection device for angiography and injector thereof

Abstract

The invention discloses a syringe. The syringe comprises a barrel part, a push rod and an anti-emptying ring, the barrel portion has a connection end and an operation end. The anti-emptying ring is positioned in the cylinder part and is close to the connecting end of the cylinder part; the push rod is partially located in the cylinder part and partially exposed out of the cylinder part, the push rod can slide relative to the cylinder part, and when the push rod is pushed in place, the push rod abuts against the anti-emptying ring. The invention further discloses an injection device special for angiography. The injection device comprises the injector and a three-way pipe. The three-way pipe comprises a first pipeline, a second pipeline and a third pipeline, the first pipeline is communicated with the third pipeline, the third pipeline is communicated with the second pipeline, the first pipeline is not communicated with the second pipeline, the tail end of the third pipeline is connected with the injector, and during suction, a contrast agent is sequentially input into the third pipeline and the injector from the first pipeline; during pushing injection, the contrast agent is sequentially output to the third pipeline and the second pipeline from the injector. Compared with the prior art, two-dimensional optimization of safety and efficiency is achieved.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and particularly to a special injection device for angiography and a syringe thereof. Background Art

[0002] During neurosurgical vascular intervention procedures, in addition to a high-pressure contrast syringe, it is often necessary to manually inject contrast agents on the operating table for imaging, including "hand-pushing contrast", "smoking", "roadmap", etc., to determine the position and status of the target blood vessel or to determine the position of the catheter / microcatheter.

[0003] Currently, ordinary syringes are used in vascular intervention surgeries, such as Figure 1 as shown. Some deficiencies occur during their use, thus affecting the surgical process. On the one hand, it is necessary to ensure that the residual air in the syringe and the connecting pipeline is emptied after each aspiration of the contrast agent to reduce the risk of air embolism; at the same time, repeatedly performing such operations increases additional time, resulting in an extended surgical time and an increased risk of surgical infection.

[0004] Therefore, there is an urgent need for a syringe and a special injection device for angiography that can reduce the operation time and improve the operation safety to overcome the above defects. Summary of the Invention

[0005] The purpose of the present invention is to provide a syringe that improves operation safety.

[0006] To achieve the above purpose, the syringe of the present invention includes a barrel, a push rod, and an anti-emptying ring. The barrel has a connection end and an operation end. The anti-emptying ring is located inside the barrel and close to the connection end of the barrel; the push rod is partially located inside the barrel and partially exposed outside the operation end of the barrel, and the push rod can slide relative to the barrel and abuts against the anti-emptying ring when the push rod is pushed in place.

[0007] Another purpose of the present invention is to provide a special injection device for angiography that reduces the operation time and improves the operation safety.

[0008] To achieve the above purpose, the special injection device for angiography of the present invention includes the aforementioned syringe and a three-way pipe. The three-way pipe includes a first pipe, a second pipe, and a third pipe. The first pipe is communicated with the third pipe, the third pipe is communicated with the second pipe, the first pipe and the second pipe are not communicated with each other, and the end of the third pipe is connected to the syringe. During aspiration, the contrast agent is sequentially input from the first pipe to the third pipe and the syringe; during injection, the contrast agent is sequentially output from the syringe to the third pipe and the second pipe.

[0009] Compared with the prior art, the syringe of the present invention has an anti-emptying ring close to the connection end of the barrel. When the plunger injects the solution, it will eventually resist against the anti-emptying ring, thus preventing the plunger from further advancing. Since there is a certain distance space between the anti-emptying ring and the connection end of the barrel, this distance space can accommodate the air that may exist in the syringe, forming an air barrier mechanism, thereby avoiding the air that may exist in the syringe from being pushed into the pipeline and ensuring that no air enters the human blood vessels in the infusion pipeline. Therefore, the syringe of the present invention can greatly improve the operation safety. Similarly, the angiography special injection device of the present invention includes the aforementioned syringe and a three-way pipe. By means of the first pipe and the third pipe of the three-way pipe, an input path for the contrast agent is formed, and the third pipe and the second pipe form an output path for the contrast agent. That is to say, when performing a suction operation on the syringe, the contrast agent is input from the first pipe to the third pipe until it enters the syringe. When performing an injection operation on the syringe, the contrast agent is output from the syringe to the third pipe until it reaches the second pipe. The operation time is greatly reduced, and the injection of air into the second pipe is also avoided. Therefore, the angiography special injection device of the present invention realizes the two-dimensional optimization of safety and efficiency.

[0010] Preferably, the anti-emptying ring and the barrel are of an integrally formed structure.

[0011] Preferably, a one-way check valve and a housing for accommodating the one-way check valve are further provided in the first pipe. The housing is fixed on the inner wall of the first pipe. The housing is a columnar structure that penetrates through from front to back and is hollow. The housing has a first end and a second end. The one-way check valve can move within the housing and has a sealing position against the first end and an open position against the second end. When the one-way check valve is in the sealing position, it blocks the first end. When the one-way check valve is in the open position, the first pipe is connected to the housing.

[0012] Preferably, the housing includes a first ring portion, a second ring portion, and a third ring portion that are sequentially connected. The diameter of the second ring portion is greater than the diameters of the first ring portion and the third ring portion. The one-way check valve is located within the second ring portion and can move axially. The one-way check valve includes a cone and a chassis. The vertex of the cone faces the first end. The bottom surface of the cone is connected to the chassis and faces the second end. The diameter of the chassis is slightly smaller than the inner diameter of the second ring portion. The chassis is provided with a flow structure. When the one-way check valve moves from the first end to the second end, the cone moves away from the first ring portion and is in the open position; when the one-way check valve moves from the second end to the first end, the cone blocks the first ring portion and is in the sealing position.

[0013] Preferably, a one-way check valve is further provided in the first pipeline. The one-way check valve includes two intersecting valve bodies, and a tip is formed at the intersection. The tip faces the outlet of the first pipeline. The two valve bodies are opened when the syringe is aspirating and are closed when the syringe is injecting.

[0014] Preferably, a one-way check valve is further provided in the second pipeline. The one-way check valve includes two intersecting valve bodies, and a tip is formed at the intersection. The tip faces the outlet of the second pipeline. The two valve bodies are closed when the syringe is aspirating and are opened when the syringe is injecting.

[0015] Preferably, a gravity member is further sleeved on the outer side wall of the end of the first pipeline.

[0016] Preferably, the end of the second pipeline is connected to a connector, and the connector is a male Luer connector.

[0017] Preferably, a filter is further provided in the second pipeline. Description of the Drawings

[0018] Figure 1 is a schematic diagram of a common syringe described in the background art.

[0019] Figure 2 is a schematic structural diagram of the angiography special injection device according to the first embodiment of the present invention.

[0020] Figure 3 is a schematic structural diagram of the syringe of the present invention.

[0021] Figure 4 is Figure 2 an enlarged schematic diagram of part A in

[0022] Figure 5 is a three-dimensional schematic diagram of the one-way check valve of the angiography special injection device of the present invention.

[0023] Figure 6 is a cross-sectional schematic diagram of the cooperation between the one-way check valve and the receiving member of the angiography special injection device of the present invention.

[0024] Figure 7 is a front view schematic diagram of the gravity member of the angiography special injection device of the present invention.

[0025] Figure 8 is a side view schematic diagram of the gravity member of the angiography special injection device of the present invention.

[0026] Figure 9 is Figure 2 an enlarged schematic diagram of part B in

[0027] Figure 10It is a schematic structural diagram of a special angiography injection device according to the second embodiment of the present invention. Detailed implementation manners

[0028] In order to describe in detail the technical content and structural features of the present invention, the following further description is made in conjunction with the implementation manners and with reference to the drawings.

[0029] Please refer to Figures 2 to 9 , which shows a special angiography injection device 100a according to the first embodiment of the present invention. It includes a syringe 1 and a three-way tube 2. The three-way tube 2 includes a first tube 21, a second tube 22 and a third tube 23. The first tube 21 is communicated with the third tube 23, the third tube 23 is communicated with the second tube 22, the first tube 21 and the second tube 22 are not communicated with each other, and the end of the third tube 23 is connected to the syringe 1. During aspiration, the contrast agent is sequentially input from the first tube 21 to the third tube 23 and the syringe 1; during injection, the contrast agent is sequentially output from the syringe 1 to the third tube 23 and the second tube 22.

[0030] Please refer to FIG. 2 and Figure 3 , the syringe 1 includes a barrel portion 11, an anti-emptying ring 12 and a push rod 13. The barrel portion 11 has a connection end 111 and an operation end 112; the anti-emptying ring 12 is located inside the barrel portion 11 and close to the connection end 111 of the barrel portion 11; the push rod 13 is partially located inside the barrel portion 11 and partially exposed outside the operation end 112 of the barrel portion 11. The push rod 13 can slide relative to the barrel portion 11. When the push rod 13 is pushed in place, it abuts against the anti-emptying ring 12. By virtue of the anti-emptying ring 12 being close to the connection end 111 of the barrel portion 11, when the push rod 13 injects the solution, it will finally abut against the anti-emptying ring 12, thereby preventing the push rod 13 from continuing to be pushed. Since there is still a certain distance space between the anti-emptying ring 12 and the connection end 111 of the barrel portion 11, this distance space can accommodate the air that may exist in the syringe 1, forming an air barrier mechanism, thereby preventing the air that may exist in the syringe 1 from being pushed into the pipeline and ensuring that no air enters the human blood vessels in the infusion pipeline.

[0031] Please continue to refer to Figure 2 and Figure 3 , an adapter 14 protrudes outward from the connection end 111 of the barrel portion 11, and the adapter 14 is communicated with the barrel portion 11. It can be understood that the adapter 14 is used for fixedly connecting to the end of the third tube 23 so that the third tube 23 is communicated with the barrel portion 11, and at the same time ensuring that the third tube will not slip off from the adapter 14.

[0032] Please continue to refer to Figure 2 and Figure 3, in this embodiment, the anti-emptying ring 12 and the cylindrical part 11 are of an integrally formed structure. Specifically, the anti-emptying ring 12 protrudes inwards from the inner wall of the cylindrical part 11. Of course, in other embodiments, the anti-emptying ring 12 and the cylindrical part 11 are of a split structure, and the anti-emptying ring 12 is embedded in the inner wall of the cylindrical part 11, so this is not limited thereto.

[0033] Please refer to Figure 2 , Figures 4 to Figure 6 , a one-way check valve 3 and a receiving member 4 for receiving the one-way check valve 3 are further provided in the first pipe 21. The receiving member 4 is a columnar structure that penetrates through from front to back and is hollow. The receiving member 4 has a first end 4a and a second end 4b. The one-way check valve 3 can move within the receiving member 4 and has a sealing position against the first end 4a and an open position against the second end 4b. When the one-way check valve 3 is in the sealing position, it blocks the first end 4a. When the one-way check valve 3 is in the open position, the first pipe 21 is in communication with the receiving member 4. It can be understood that when the syringe 1 aspirates the contrast agent, the fluid pressure forces the one-way check valve 3 to move from the first end 4a to against the second end 4b. At this time, the one-way check valve 3 is in the open position, and the fluid can enter the receiving member 4 from the first pipe 21 and then enter the third pipe 23. The flow direction of the contrast agent is as Figure 6 shown by the arrow direction in. When the syringe 1 injects the contrast agent, the fluid pressure forces the one-way check valve 3 to move from the second end 4b to against the first end 4a. At this time, the one-way check valve 3 is in the sealing position, and the fluid is within the receiving member 4 and cannot flow out of the receiving member 4 to the first pipe 21.

[0034] Please refer to Figures 4 to 6 , more specifically, the receiving member 4 includes a first ring portion 41, a second ring portion 42, and a third ring portion 43 that are connected in sequence. The diameter of the second ring portion 42 is larger than the diameters of the first ring portion 41 and the third ring portion 43. The one-way check valve 3 is located within the second ring portion 42 and can move axially. For example, the receiving member 4 and the side wall of the first pipe 21 are of an integrally formed structure. Of course, the receiving member 4 and the inner side wall of the first pipe 21 can also have other fixed connection relationships, so this is not limited thereto.

[0035] Please refer to Figures 4 to 6, the one-way check valve 3 includes a cone 31 and a chassis 32. The vertex of the cone 31 faces the first end 4a, the bottom surface of the cone 31 is connected to the chassis 32 and faces the second end 4b, and the diameter of the chassis 32 is slightly smaller than the inner diameter of the second ring portion 42. Specifically, the chassis 32 is provided with a flow-through structure. When the one-way check valve 3 is in the open position, the contrast agent flows from the first pipe 21 to the first ring portion 41, the second ring portion 42, the third ring portion 43 and then to the third pipe 23; when the one-way check valve 3 is in the sealed position, since the cone 31 blocks the first ring portion 41, the contrast agent stays in the second ring portion 42 and cannot flow through the first ring portion 41, thus achieving the function of one-way check. More specifically, the flow-through structure includes a plurality of flow holes 321 which are evenly spaced on the side wall of the chassis 32. The bottom surface of the chassis 32 is also recessed with a flow groove 322 in the direction towards the first end 4a, and the flow groove 322 is communicated with the flow holes 321. It can be understood that when the one-way check valve 3 is in the open position, the chassis 32 just abuts against the bottom wall of the second ring portion 42, and after the contrast agent enters the second ring portion 42, it enters the flow groove 322 from the flow holes 321 and then flows along to the third pipe 23. More specifically, there are multiple flow grooves 322 and they intersect at the center of the chassis 32. With the help of the flow holes 321 and the flow grooves 322, a clear flow path is formed during the suction of the contrast agent, ensuring the efficient inflow of the liquid into the barrel 11 of the syringe 1. For example, there are four flow grooves 322 and they are in a cross shape, but not limited thereto. Preferably, the inner wall surface of the first ring portion 41 is a conical surface that matches the conical surface of the cone 31, so that the blocking effect of the cone 31 is better.

[0036] It can be understood that when the one-way check valve 3 moves from the first end 4a to the second end 4b, the cone 31 moves away from the first ring portion 41 and is in the open position; when the one-way check valve 3 moves from the second end 4b to the first end 4a, the cone 31 blocks the first ring portion 41 and is in the sealed position.

[0037] Please refer to Figure 2 and Figure 4 , in order to strengthen the one-way check function of the angiography special injection device of the present invention, a one-way check valve 5 is also provided in the first pipe 21. The one-way check valve 5 includes two intersecting valve bodies 51 and the intersection forms a tip 5a. The tip 5a faces the outlet of the first pipe 21. The two valve bodies 51 are opened when the syringe 1 sucks and are closed when the syringe 1 injects. Preferably, there are at least two one-way check valves 5 and they are spaced apart axially. Two adjacent one-way check valves 5 are rotated 90° with respect to each other axially. For example, in this embodiment, there are two one-way check valves 5 in the first pipe 21. Of course, in other embodiments, there may be three or four, etc., so it is not limited thereto.

[0038] Please refer to Figure 2 andFigure 4 A one-way check valve 5 is also provided in the second conduit 22. The one-way check valve 5 includes two intersecting valve bodies 51, and a tip 5a is formed at the intersection. Different from the above, the tip 5a faces the outlet of the second conduit 22. The two valve bodies 51 are tightly closed when the syringe 1 sucks and are opened when the syringe 1 injects. Preferably, there are at least two one-way check valves 5, which are spaced apart axially. The two adjacent one-way check valves 5 are rotated 90° relative to each other axially. For example, in this embodiment, there are two one-way check valves 5 in the first conduit 21. Of course, in other embodiments, there may be three or four, etc., and thus it is not limited thereto.

[0039] Specifically, the one-way check valve 5 is made of elastic silicone material and is fixed to the inner walls of the first conduit 21 and the second conduit 22. It can be understood that when the syringe 1 sucks, the one-way check valve 5 in the first conduit 21 allows the contrast agent to pass through because the negative pressure and fluid pressure in the conduit force the contrast agent to enter from the chassis of the one-way check valve 5 and flow out from the tip 5a. However, for the one-way check valve 5 in the second conduit 22, due to the negative pressure in the conduit, the liquid at the outlet of the second conduit flows back, and the liquid squeezes the two valve bodies 51 to close tightly. When the syringe 1 injects, since the one-way check valve 3 has served as the first layer of blockage in the first conduit 21, a very small amount of contrast agent will flow to the tip of the one-way check valve 5a, and the tip 5a will be tightly closed due to the fluid pressure. But in the second conduit 22, since the flow direction of the contrast agent is consistent with the direction of the tip 5a, the contrast agent will enter from the chassis of the one-way check valve and flow out from the tip. With the triple one-way check function of the one-way check valve 3 and the two sets of one-way check valves 5, it effectively prevents the contrast agent from flowing from the third conduit 23 into the first conduit 21, so that the contrast agent can only flow from the first conduit 21 to the third conduit 23 or from the third conduit 23 to the second conduit 22.

[0040] Please refer to Figure 2 、 Figure 7 and Figure 8, a gravity member 6 is also sleeved on the outer sidewall of the end of the first pipeline 21. With the aid of the gravity member 6, under the action of gravity, the end of the first pipeline 21 can sink to the bottom of the vessel containing the contrast agent, forming a liquid-tight environment, constructing a physical air barrier, preventing air from being drawn in during the process of aspirating the contrast agent, and avoiding the serious consequence of air embolism. Specifically, in this embodiment, the gravity member 6 is a columnar structure that is hollow and penetrates through from front to back, and a notch 61 for the first pipeline 21 to be embedded is further provided on the sidewall of the columnar structure. More specifically, the inner diameter of the columnar structure is slightly smaller than the diameter of the first pipeline 21, and the first pipeline 21 has elasticity. Therefore, during operation, the first pipeline 21 can be directly embedded into the columnar structure from the notch 61, and the first pipeline 21 is always tensioned in the columnar structure under the action of elastic recovery, thereby preventing the gravity member 6 from falling off. Specifically, the material of the gravity member 6 is a medical-grade metal, such as medical stainless steel, but not limited thereto.

[0041] Please refer to Figure 2 and Figure 9 , the end of the second pipeline 22 is connected to a connector 7, and the connector 7 is set as the male head of a Luer connector. It can be understood that the connector 7 is used to connect to the female head of a Luer connector of an external catheter, microcatheter or three-way valve. This avoids the problem of repeated connection of traditional syringes, thereby preventing the front end of the catheter / microcatheter from shifting and slipping out of the target blood vessel or position. At the same time, it also avoids the problem of air entering the microcatheter due to repeated operations. Specifically, the connector 7 includes a Luer connector main body portion 71 and a protruding connector 72 that are interconnected, and the second pipeline 22 is fixedly sleeved on the protruding connector 72 to prevent the second pipeline 22 from falling off from the connector 7. Preferably, several centrally symmetric wing portions 73 protrude outward from the outer sidewall of the protruding connector 72, facilitating the tightening operation of the hand. For example, in this embodiment, there are three wing portions 73. Of course, in other embodiments, the number of wing portions is two, four, five or six, etc., so it is not limited thereto.

[0042] Please refer to Figure 2 and Figure 4 , a filter 8 is further provided in the second pipeline 22. The filter 8 includes a housing 81 and a double-layer nano ion membrane 82 located in the housing 81. The pore size of the nano ion membrane is 10 - 15 microns, preventing microemboli from entering the blood vessel along with the contrast agent and reducing the occurrence of vascular events such as foreign body embolism. The housing 81 is fixedly connected to the inner wall of the second pipeline 22.

[0043] For example, the housing 81 of the filter 8, the connector 7, the one-way check valve 3, the anti-emptying ring 12 and the barrel portion 11 of the syringe 1 are made of medical-grade materials such as polypropylene or polycarbonate.

[0044] Please refer to Figure 10, which shows the angiography dedicated injection device 100b of the second embodiment. Its structure is substantially the same as that of the angiography dedicated injection device 100a of the first embodiment, and the difference is that: one-way check valve components such as the one-way check valve 3 and the one-way check valve flap 5 are not used. And a three-way valve 9 is provided at the intersection of the three pipelines of the three-way pipe 2. The flow path of the contrast agent is controlled by operating the three-way valve 9. The structure and the principle of use of the three-way valve 9 are well known to those skilled in the art, so they will not be elaborated here.

[0045] The remaining structures are the same as those of the first embodiment, so they will not be elaborated here.

[0046] Before using the syringe 1100a of the first embodiment of the present invention, the following operations need to be carried out:

[0047] 1. First, press the end of the first pipeline 21 into the gravity member 6 and put it into the container containing the contrast agent, ensure that its end sinks to the bottom of the container, and ensure that the first pipeline 21 is always below the liquid level.

[0048] 2. Place the second pipeline 22 into the container and sink it into the liquid level. By repeatedly sucking and injecting the syringe 1, the syringe 1 and the three-way pipe 2 are filled with the contrast agent and the air is exhausted.

[0049] 3. After completing the above steps, firmly connect the connector 7 of the second pipeline 22 with the catheter, the end of the microcatheter or the female head of the Luer connector 14 of the three-way valve, and confirm again and exhaust the air in the pipeline.

[0050] The above are the preoperative preparation works. After completion, the operation can be carried out. When operations such as "manual injection of contrast agent", "smoking", and "roadmap" are required during the operation, only by operating the syringe 1 can the contrast agent be sucked or injected.

[0051] The following will explain professional terms such as "manual injection of contrast agent", "smoking", and "roadmap".

[0052] Manual injection of contrast agent: During angiography, due to the actual situation during the operation, the operator needs to manually inject the contrast agent for vascular imaging, which is different from using an electric high-pressure angiography syringe 1.

[0053] Smoking: When it is necessary to confirm the opening of the arterial blood vessel or the position of the catheter end, inject a small amount of contrast agent through the catheter to make the target arterial blood vessel visible, which is called "smoking". The main purposes include: 1. Confirm which arterial blood vessel it is; 2. See clearly the course of the arterial blood vessel ahead; 3. Whether there are variations, lesions or absences in the arterial blood vessel ahead; 4. The position and state of the catheter end.

[0054] Roadmap: Also known as a path diagram, that is, a roadmap. A roadmap is a necessary step for safe endovascular cerebrovascular operations, which helps the operator understand the origin, course, and lesion scope of the blood vessels in the working area, effectively improve the accuracy and success rate of super-selective blood vessels, shorten the operation time, enhance the clinical efficacy, and reduce the operation risk.

[0055] The above-disclosed are only the preferred examples of the present invention, and the scope of the rights of the present invention cannot be limited thereby. Therefore, equivalent changes made according to the claims of the present invention all fall within the scope covered by the present invention.

Claims

1. A syringe, characterized in that, Comprising a barrel portion having a connecting end and an operating end; an anti-emptying ring located inside the barrel portion and near the connecting end of the barrel portion; a push rod, part of which is located inside the barrel portion and part of which is exposed outside the operating end of the barrel portion. The push rod is slidable relative to the barrel portion and abuts against the anti-emptying ring when the push rod is pushed in place.

2. The syringe according to claim 1, characterized in that, The anti-emptying ring and the barrel portion are of an integrally formed structure.

3. A special injection device for angiography, characterized in that, Comprising a syringe according to any one of claims 1 to 2 and a three-way pipe. The three-way pipe includes a first pipe, a second pipe and a third pipe. The first pipe is communicated with the third pipe, the third pipe is communicated with the second pipe, the first pipe and the second pipe are not communicated with each other, and the end of the third pipe is connected to the syringe. During suction, the contrast agent is sequentially input from the first pipe into the third pipe and the syringe; during injection, the contrast agent is sequentially output from the syringe into the third pipe and the second pipe.

4. The angiography-specific injection device according to claim 3, characterized in that, A one-way check valve and a housing for accommodating the one-way check valve are further provided in the first pipe. The housing is fixed to the inner wall of the first pipe. The housing is a columnar structure that is hollow and penetrates through from front to back. The housing has a first end and a second end. The one-way check valve can move inside the housing and has a sealing position against the first end and an open position against the second end. When the one-way check valve is in the sealing position, the first end is blocked. When the one-way check valve is in the open position, the first pipe is communicated with the housing.

5. The angiography-specific injection device according to claim 4, wherein The housing includes a first ring portion, a second ring portion and a third ring portion connected in sequence. The diameter of the second ring portion is larger than the diameters of the first ring portion and the third ring portion. The one-way check valve is located inside the second ring portion and can move axially. The one-way check valve includes a cone and a chassis. The apex of the cone faces the first end, the bottom surface of the cone is connected to the chassis and faces the second end. The diameter of the chassis is slightly smaller than the inner diameter of the second ring portion. The chassis is provided with a flow structure. When the one-way check valve moves from the first end to the second end, the cone moves away from the first ring portion and is in the open position; when the one-way check valve moves from the second end to the first end, the cone blocks the first ring portion and is in the sealing position.

6. The angiography-specific injection device according to claim 3, characterized in that, A one-way check flap is further provided in the first pipe. The one-way check flap includes two intersecting flap bodies, and a tip is formed at the intersection. The tip faces the outlet of the first pipe. The two flap bodies are opened during suction of the syringe and are closed during injection of the syringe.

7. The angiography-specific injection device according to claim 3, characterized in that, A one-way check flap is further provided in the second pipe. The one-way check flap includes two intersecting flap bodies, and a tip is formed at the intersection. The tip faces the outlet of the second pipe. The two flap bodies are closed during suction of the syringe and are opened during injection of the syringe.

8. The angiography dedicated injection device according to claim 3, characterized in that, A gravity member is further sleeved on the outer side wall of the end of the first pipe.

9. The angiography-specific injection device according to claim 3, wherein, The end of the second pipe is connected to a connector, and the connector is a male Luer connector.

10. The angiography-specific injection device according to claim 3, characterized in that, A filter is further provided in the second pipe.

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