Contrast agent injection device

Abstract

The invention relates to the technical field of medical instruments, in particular to a contrast agent injection device which comprises an extension pipe, the extension pipe comprises a first pipeline and a second pipeline, a first plug body is arranged in the first pipeline, and an exhaust film is arranged on the first plug body; an air bag is arranged in the second pipeline and communicated with an air injection cylinder, a piston rod and a spring are arranged in the air injection cylinder, the spring provides initial elastic force to enable the second pipeline to be in an initial state, and when the second pipeline is in the initial state, air in the air injection cylinder is pressed into the air bag, so that the second pipeline is filled with the air bag; when the first plug body abuts against the piston rod and pushes the piston rod to move, air in the air bag is gradually pumped into the air injection cylinder, the size of the air bag is gradually reduced, and the first pipeline and the second pipeline are communicated. According to the contrast agent injection device, the probability that the contrast agent drips from the end of the extension pipe of the contrast agent injection device can be reduced when the contrast agent injection device is exhausted or the remaining needle is disconnected after contrast examination is completed.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly relates to a contrast agent injection device. Background Art

[0002] A contrast agent injection device is a special instrument for medical diagnosis, mainly used for medical imaging examinations such as angiography, CT enhanced scanning, and MRI magnetic resonance examination. Usually, the contrast agent injection device includes accessories such as a syringe barrel, a medicine suction device, and a connecting tube. The contrast agent injection device is used in conjunction with a high-pressure injection pump to achieve automatic injection of the contrast agent to ensure the clarity and accuracy of the contrast examination.

[0003] However, in actual work, the inventor found that the current contrast agent injection device still has deficiencies, specifically: When using a high-pressure injection pump to exhaust the contrast agent injection device or disconnecting the indwelling needle after the contrast examination, usually, several drops of the contrast agent always inevitably drip from the end of the extension tube of the contrast agent injection device. In this way, it is easy to cause contamination of the CT machine, MRI machine, high-pressure injection pump, and the surrounding environment and the ground. And due to the busy work of the staff, they often do not have time to clean it in time, which is more likely to cause difficulty in cleaning later. In severe cases, it may even damage the expensive CT machine or MRI machine.

[0004] Therefore, how to reduce the probability of the contrast agent dripping from the end of the extension tube of the contrast agent injection device when exhausting the contrast agent injection device or disconnecting the indwelling needle after the contrast examination is a technical problem that needs to be solved urgently at present. Summary of the Invention

[0005] The purpose of the present invention is to provide a contrast agent injection device to achieve the purpose of reducing the probability of the contrast agent dripping from the end of the extension tube of the contrast agent injection device when exhausting the contrast agent injection device or disconnecting the indwelling needle after the contrast examination, aiming at the deficiency that several drops of the contrast agent always inevitably drip from the end of the extension tube of the contrast agent injection device when using a high-pressure injection pump to exhaust the contrast agent injection device or disconnecting the indwelling needle after the contrast examination.

[0006] To achieve the above invention purpose, the present invention provides the following technical solutions: A contrast agent injection device includes an extension tube. The extension tube includes a first pipeline and a second pipeline. The second pipeline is connected to the side wall of the first pipeline and communicates with the first pipeline. A first plug body is arranged in the first pipeline. The first plug body fits with the inner wall of the first pipeline. An exhaust membrane is arranged on the first plug body. The exhaust membrane is used to allow gas to pass through the first plug body through the exhaust membrane and prevent liquid from passing through the first plug body through the exhaust membrane. An airbag is arranged inside the second pipeline. The airbag is communicated with an air injection cylinder. A piston rod and a spring are arranged inside the air injection cylinder. The spring provides an initial elastic force to keep the second pipeline in an initial state. When the second pipeline is in the initial state, the gas inside the air injection cylinder is pressed into the airbag, so that the airbag fills the second pipeline. The first plug can move relative to the first pipeline along the length direction of the first pipeline, so that the first plug can selectively abut against or separate from the piston rod. When the first plug abuts against the piston rod and pushes the piston rod to move, the gas inside the airbag is gradually pumped into the air injection cylinder, so that the volume of the airbag gradually shrinks, and the first pipeline is communicated with the second pipeline, so that the liquid inside the first pipeline can flow into the second pipeline.

[0007] As a preferred technical solution of the present application, when the second pipeline is in the initial state and the first plug is in a critical state of abutting against or separating from the piston rod, the first plug seals the second pipeline.

[0008] As a preferred technical solution of the present application, a locking member is arranged on the first pipeline, and the locking member is used to limit or release the limit of the first plug. When the locking member is in a state of limiting the first plug, the locking member restricts the movement of the first plug, so that the first plug is in a state of not abutting against the piston rod. When the locking member is in a state of releasing the limit of the first plug, the movement of the first plug is not restricted by the locking member, so that the first plug can push the piston rod to move.

[0009] As a preferred technical solution of the present application, a first through hole is arranged on the side wall of the first pipeline, and the locking member is located in the first through hole. By pushing and pulling the locking member, the locking member can extend out of the inner wall of the first pipeline or retract into the side wall of the first pipeline. When the locking member extends out of the inner wall of the first pipeline, the locking member is in a state of limiting the first plug.

[0010] As a preferred technical solution of the present application, the airbag is strip-shaped, and the airbag extends to both ends of the second pipeline. The airbag is fixed on the inner wall of the second pipeline.

[0011] As a preferred technical solution of the present application, a first abutting plate is arranged on the air injection cylinder. One end of the spring abuts against the piston rod, and the other end abuts against the first abutting plate. The position of the first abutting plate in the length direction of the air injection cylinder is adjustable. By adjusting the position of the first abutting plate in the length direction of the air injection cylinder, the elastic force of the spring when the second pipeline is in the initial state can be adjusted.

[0012] As a preferred technical solution of the present application, the first abutment plate is threadedly connected to the inner wall of the gas injection cylinder, and the first abutment plate is rotated relative to the gas injection cylinder to move along the length direction of the gas injection cylinder.

[0013] As a preferred technical solution of the present application, a partition net is provided at the end of the second pipe for communicating with the first pipe, and the partition net is used to prevent the inflated airbag from extending into the first pipe; and the partition net allows liquid to pass through.

[0014] As a preferred technical solution of the present application, the piston rod includes a piston and a rod body, the piston fits against the inner wall of the gas injection cylinder, one end of the rod body is connected to the piston, and the other end is used to abut against the first plug body.

[0015] As a preferred technical solution of the present application, a connector is provided on the end of the second tube away from the first tube, and the connector is used to connect the second tube to the indwelling needle.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. In the scheme of the present application, before exhausting the contrast agent injection device, the first pipeline is first placed in a vertical state, and the first plug is placed in a state where it does not abut against the piston rod. Then, the contrast agent in the contrast agent injection device is pushed to flow, so that the contrast agent is gradually injected into the first pipeline in the extension tube. Under the effect of the exhaust membrane having the function of exhausting but not discharging liquid, the gas in the first pipeline can be discharged to the external environment through the exhaust membrane. In the specific operation process, the medical staff can control the flow rate of the contrast agent injected into the extension tube, so that when the gas is exhausted, the first plug is stationary or slightly displaced relative to the first pipeline, so as to avoid the first plug from abutting against the piston rod to move when exhausting; in this way, it is convenient to exhaust the gas in the first pipeline before the first pipeline and the second pipeline are connected; Furthermore, after the gas in the first pipeline is discharged, as the contrast agent is continuously injected, the contrast agent pushes the first plug body to move, causing the first plug body to move towards the piston rod until the first piston pushes the piston rod to move. In this way, when the first piston pushes the piston rod to move, the gas in the airbag is gradually pumped into the injection cylinder, causing the volume of the elastic airbag to gradually shrink, and the airbag gradually releases the filling of the second pipeline, causing the second pipeline to gradually change from a blocked state to a conductive state. At the same time, the first pipeline and the second pipeline are conducted, enabling the contrast agent in the first pipeline to flow out through the second pipeline. In this way, when the inflated airbag fills the second pipeline, the second pipeline is completely blocked by the airbag, so that there is no gas in the second pipeline. When the first pipeline and the second pipeline are conducted, the airbag releases the blockage of the second pipeline, enabling the contrast agent to flow from the first pipeline to the second pipeline. During the flow of the contrast agent, gas can be prevented from flowing with the contrast agent, thereby avoiding gas being delivered to the patient's body when the contrast agent in the extension tube is injected into the patient's body subsequently. In this way, when exhausting the contrast agent injection device, the probability of the contrast agent dripping from the end of the extension tube of the contrast agent injection device can be reduced; Meanwhile, during the subsequent liquid injection process, the high-pressure injection pump injects the contrast agent into the patient's body under high pressure. The high-pressure contrast agent exerts a force on the first plug body to balance the elastic force of the spring, enabling the first plug body to be relatively stationary with respect to the first pipeline when the contrast agent is in a stable pressure state, and the position of the first plug body relative to the first pipeline remains unchanged. When the pressure provided by the high-pressure injection pump fluctuates, the elastic force of the spring can change in response to the pressure fluctuation, causing changes in the inflation degree of the airbag and the position of the first plug body, thereby playing a buffering role to reduce the pressure change amplitude when the contrast agent is injected into the patient's body, and thus improving the stability of the contrast agent injection; Moreover, after the contrast examination, the high-pressure injection pump can be stopped first. Under the elastic force of the spring, the spring pushes the piston rod to move, and the piston rod pushes the first plug body to move, gradually injecting the gas in the injection cylinder into the airbag, causing the airbag to gradually fill the second pipeline. During the process of the volume of the airbag gradually increasing, the moving first plug body and the expanding airbag can jointly press a part of the contrast agent in the extension tube into the patient's body. At the same time, as the spring gradually returns to its deformed state and the second pipeline is in its initial state, the airbag fills the second pipeline at this time, completely blocking the second pipeline, and the injection operation of the contrast agent into the body stops. Furthermore, when disconnecting the indwelling needle, the second pipeline can be in a state completely filled with the airbag, thus reducing or even avoiding the probability or situation of the contrast agent dripping from the end of the extension tube of the contrast agent injection device, reducing the probability of damage to the CT machine or MRI machine, and facilitating the cleaning of the surrounding environment by the staff after the examination; 2. Further, when the second pipeline is in the initial state and the first plug body is in the critical state of being against or separated from the piston rod, the first plug body blocks the second pipeline, so that after the contrast examination is completed, when the spring gradually recovers its deformation and the second pipeline returns to the initial state, the first plug body moves relative to the first pipeline under the push of the piston rod, so that in this case the first plug body is in a state of blocking the second pipeline. In this way, it can play a double-layer protection role in reducing the probability of contrast agent dripping from the end of the extension tube. The first layer of protection is that the air bag fills the second pipeline to completely fill the second pipeline, and the second layer of protection is that the first plug body blocks the second pipeline to block the contrast agent in the first pipeline from flowing into the second pipeline; 3. Furthermore, by arranging the airbag in a strip shape, generally after the airbag is inflated, it is more convenient for the airbag to expand to fill the inside of the second pipe, so that the inflated airbag is more convenient for completely blocking the second pipe, further improving the effect of the airbag blocking the second pipe, and at the same time, by fixing the airbag on the inner wall of the second pipe, the stability of the position of the airbag relative to the second pipe can be further improved; 4. Furthermore, by providing a first abutment plate and making the position of the first abutment plate adjustable along the length direction of the gas injection cylinder, it is convenient to adjust the initial elastic force of the spring, so that during the high-pressure injection of contrast agent, the spring can have different deformation amounts and the airbag can have different amounts of gas. In this way, when the contrast agent is injected into the patient's body at a stable high-pressure state, some gas is still retained in the airbag, and the spring can still have a compression or stretching margin. This makes it easier to improve the smoothness of the flow of the contrast agent in the patient's body when the pressure provided by the high-pressure injection pump fluctuates, and at the same time improves the flexibility of the contrast agent injection device of the present application when used to adapt to different injection pressures. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic cross-sectional view of one embodiment of a contrast agent injection device of the present application; Figure 2 This is a structural schematic diagram of a contrast agent injection device in one embodiment of the present application, in which the second pipeline is in an initial state, and the first plug body is in a critical state of being against or separated from the piston rod; Figure 3 This is a schematic structural diagram of a contrast agent injection device in one embodiment of the present application when the first pipeline and the second pipeline are connected; Figure 4 This is a schematic diagram of the three-dimensional structure of one embodiment of a contrast agent injection device of the present application; Indications in the figure: 1 - extension tube, 2 - first pipeline, 3 - second pipeline, 4 - first plug, 5 - exhaust membrane, 6 - airbag, 7 - injection cylinder, 8 - piston rod, 9 - spring, 10 - locking member, 11 - first through hole, 12 - first bottom plate, 13 - partition net, 14 - piston, 15 - rod body, 16 - joint. Detailed implementation manners

[0018] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are some but not all of the embodiments of the present invention.

[0019] Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely represents some embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0020] It should be noted that, without conflict, the embodiments in the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0021] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0022] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. Such terms are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0023] Embodiment 1: A contrast agent injection device provided in this embodiment is shown in Figures 1-4 the figure, and includes an extension tube 1. The extension tube 1 includes a first pipeline 2 and a second pipeline 3. The second pipeline 3 is connected to the side wall of the first pipeline 2 and communicates with the first pipeline 2. A first plug 4 is arranged in the first pipeline 2. The first plug 4 fits with the inner wall of the first pipeline 2. An exhaust membrane 5 is arranged on the first plug 4. The exhaust membrane 5 is used to allow gas to pass through the first plug 4 through the exhaust membrane 5 and prevent liquid from passing through the first plug 4 through the exhaust membrane 5; An airbag 6 is arranged in the second pipeline 3. The airbag 6 is communicated with an air injection cylinder 7. A piston rod 8 and a spring 9 are arranged in the air injection cylinder 7. The spring 9 provides an initial elastic force to make the second pipeline 3 in an initial state. When the second pipeline 3 is in the initial state, the gas in the air injection cylinder 7 is pressed into the airbag 6 to fill the second pipeline 3 with the airbag 6; The first plug 4 can move relative to the first pipeline 2 along the length direction of the first pipeline 2, so that the first plug 4 can selectively abut against or separate from the piston rod 8; When the first plug 4 abuts against the piston rod 8 and pushes the piston rod 8 to move, the gas in the airbag 6 is gradually pumped into the air injection cylinder 7, so that the volume of the airbag 6 gradually shrinks, and the first pipeline 2 is communicated with the second pipeline 3, so that the liquid in the first pipeline 2 can flow into the second pipeline 3.

[0024] In this application, before exhausting the contrast agent injection device, first make the first pipeline 2 in a vertical state and make the first plug 4 in a state of not abutting against the piston rod 8. Then, push the contrast agent in the contrast agent injection device to flow, so that the contrast agent is gradually injected into the first pipeline 2 in the extension tube 1. Under the action of the exhaust film 5 which has the function of exhausting air but not liquid, the gas in the first pipeline 2 can be exhausted to the external environment through the exhaust film 5. In the specific operation process, medical staff can control the flow rate of the contrast agent in the extension tube 1 of the contrast agent injection device, so that while exhausting the gas, the first plug 4 remains stationary or has a small displacement relative to the first pipeline 2, so as to avoid the first plug 4 pushing the piston rod 8 to move while exhausting the air; thus, it is convenient to exhaust the gas in the first pipeline 2 before the first pipeline 2 is communicated with the second pipeline 3; Furthermore, after the gas in the first conduit 2 is discharged, with the continuous injection of the contrast agent, the contrast agent pushes the first plug 4 to move, causing the first plug 4 to move towards the piston rod 8 until the first piston pushes the piston rod 8 to move. Thus, when the first piston pushes the piston rod 8 to move, the gas in the airbag 6 is gradually pumped into the air injection cylinder 7, causing the volume of the elastic airbag 6 to gradually shrink, and the airbag 6 gradually releases the filling of the second conduit 3, causing the second conduit 3 to gradually change from a blocked state to a conducting state. At the same time, the first conduit 2 is in communication with the second conduit 3, allowing the contrast agent in the first conduit 2 to flow out through the second conduit 3. Thus, when the inflated airbag 6 fills the second conduit 3, the second conduit 3 is completely blocked by the airbag 6, so that there is no gas in the second conduit 3. When the first conduit 2 and the second conduit 3 are in communication, the airbag 6 releases the blockage of the second conduit 3, allowing the contrast agent to flow from the first conduit 2 into the second conduit 3. During the flow of the contrast agent, gas can be prevented from flowing with the contrast agent, thereby avoiding the transmission of gas to the patient's body when the contrast agent in the extension tube 1 of the contrast agent injection device is injected into the patient's body subsequently. Thus, when exhausting the contrast agent injection device, the probability of the contrast agent dripping from the end of the extension tube 1 of the contrast agent injection device can be reduced; Meanwhile, during the subsequent liquid injection process, the high-pressure injection pump injects the contrast agent into the patient's body under high pressure. The contrast agent in the high-pressure state exerts a force on the first plug body 4 to balance the elastic force of the spring 9, so that the first plug body 4 can be stationary relative to the first pipeline 2 when the contrast agent is in a stable pressure state, and the position of the first plug body 4 relative to the first pipeline 2 remains unchanged. When the pressure provided by the high-pressure injection pump fluctuates, the elastic force of the spring 9 can change in response to the pressure fluctuation, causing the inflation degree of the airbag 6 and the position of the first plug body 4 to change, thereby playing a buffering role to reduce the pressure change amplitude when the contrast agent is injected into the patient's body, and thus improving the stability of the contrast agent injection. That is, when the pressure provided by the high-pressure injection pump suddenly increases, the contrast agent further pushes the first plug body 4 to move, causing the first plug body 4 to further push the piston rod 8 to move, and increasing the elastic force of the spring 9, so that the gas in the airbag 6 is further pumped out, thereby further increasing the cross-sectional area for the contrast agent to flow in the second pipeline 3. In this way, under the action of the change in the position of the first plug body 4 and the increase in the cross-sectional area for the contrast agent to flow in the second pipeline 3, the pressure change amplitude when the contrast agent flows out from the end of the second pipeline 3 far from the first pipeline 2 can be reduced; similarly, when the pressure provided by the high-pressure injection pump suddenly decreases, the spring 9 can recover part of its deformation, causing the piston rod 8 to move relative to the air injection cylinder 7 under the action of the deformation of the spring 9, and injecting part of the gas in the air injection cylinder 7 into the airbag 6 to increase the gas volume in the airbag 6, thereby reducing the cross-sectional area for the contrast agent to flow in the second pipeline 3. At the same time, the piston rod 8 can push the first plug body 4 to move in the reverse direction, thereby reducing the pipeline length for the contrast agent to flow in the first pipeline 2. Furthermore, under the action of the change in the position of the first plug body 4 and the reduction in the cross-sectional area for the contrast agent to flow in the second pipeline 3, the pressure change amplitude when the contrast agent flows out from the end of the second pipeline 3 far from the first pipeline 2 can be reduced; Moreover, after the contrast examination, the high-pressure injection pump can be stopped first. Under the elastic force of the spring 9, the spring 9 pushes the piston rod 8 to move, and the piston rod 8 pushes the first plug body 4 to move, and the gas in the air injection cylinder 7 is gradually injected into the airbag 6, causing the airbag 6 to gradually fill the second pipeline 3. During the process of the volume of the airbag 6 gradually increasing, the moving first plug body 4 and the airbag 6 with an increasing volume can jointly press part of the contrast agent in the extension tube 1 into the patient's body. At the same time, as the spring 9 gradually recovers its deformation and the second pipeline 3 returns to its initial state, at this time, the airbag 6 fills the second pipeline 3, completely blocking the second pipeline 3 with the airbag 6, and the injection operation of the contrast agent into the body stops. Furthermore, when the indwelling needle is disconnected, the second pipeline 3 can be in a state completely filled with the airbag 6. In this way, the probability or situation of the contrast agent dripping from the end of the extension tube 1 of the contrast agent injection device is reduced or avoided, and the probability of damage to the CT machine or MRI machine is reduced, facilitating the cleaning of the surrounding environment by the staff after the examination is completed; In the present application, the exhaust membrane 5 is a membranous structure that allows gas to pass through and blocks the passage of liquid. The specific structure of the exhaust membrane 5 is prior art and will not be elaborated here.

[0025] As a preferred technical solution of the present application, when the second pipeline 3 is in the initial state and the first plug body 4 is in a critical state of being in contact with or separated from the piston rod 8, the first plug body 4 seals the second pipeline 3.

[0026] Furthermore, when the second pipeline 3 is in the initial state and the first plug body 4 is in a critical state of being in contact with or separated from the piston rod 8, the first plug body 4 seals the second pipeline 3. Thus, after the contrast examination is completed, when the spring 9 gradually recovers its deformation and the second pipeline 3 returns to the initial state, since the first plug body 4 moves relative to the first pipeline 2 under the pushing action of the piston rod 8, the first plug body 4 is in a state of sealing the second pipeline 3 in this situation. In this way, it can play a double-layer protection role in reducing the probability of the contrast agent dripping from the end of the extension tube 1. The first layer of protection is that the airbag 6 fills the second pipeline 3 to completely fill the second pipeline 3, and the second layer of protection is that the first plug body 4 seals the second pipeline 3 to block the flow of the contrast agent in the first pipeline 2 into the second pipeline 3.

[0027] As a preferred technical solution of the present application, a locking member 10 is provided on the first pipeline 2, and the locking member 10 is used to limit or release the limit of the first plug body 4; When the locking member 10 is in a state of limiting the first plug body 4, the locking member 10 restricts the movement of the first plug body 4, so that the first plug body 4 is in a state of not being in contact with the piston rod 8; When the locking member 10 is in a state of releasing the limit of the first plug body 4, the movement of the first plug body 4 is not restricted by the locking member 10, so that the first plug body 4 can push the piston rod 8 to move.

[0028] Furthermore, by providing the locking member 10, the locking member 10 can limit or release the limit of the first plug body 4. When the locking member 10 is in a state of limiting the first plug body 4, the locking member 10 restricts the movement of the first plug body 4, so that the first plug body 4 can always be in a state of not being in contact with the piston rod 8. In this way, when exhausting the extension tube 1, the locking member 10 can be first in a state of limiting the first plug body 4, and then the exhausting operation can be carried out, so as to avoid the first plug body 4 pushing the piston rod 8 to move during exhausting; As a preferred technical solution of the present application, a first through hole 11 is provided on the side wall of the first pipe 2, and the locking member 10 is located in the first through hole 11. By pushing and pulling the locking member 10, the locking member 10 can extend out of the inner wall of the first pipe 2 or retract into the side wall of the first pipe 2; when the locking member 10 extends out of the inner wall of the first pipe 2, the locking member 10 is in a state of limiting the first plug body 4.

[0029] Further, by providing the first through hole 11, when pushing and pulling the locking member 10, the locking member 10 can extend out of the inner wall of the first pipe 2 or retract into the side wall of the first pipe 2, thereby improving the convenience of switching the state of the locking member 10.

[0030] Embodiment 2: On the basis of the technical solution of Embodiment 1, further, as shown in Figures 1-4 shown, the airbag 6 is strip-shaped, and the airbag 6 extends to both ends of the second pipe 3; The airbag 6 is fixed on the inner wall of the second pipe 3.

[0031] Further, by setting the airbag 6 to be strip-shaped, generally after the airbag 6 is inflated, it is more conducive to the airbag 6 expanding to a state of filling the inside of the second pipe 3, thereby being more conducive to the inflated airbag 6 completely blocking the second pipe 3, further improving the blocking effect of the airbag 6 on the second pipe 3. At the same time, by fixing the airbag 6 on the inner wall of the second pipe 3, the stability of the position of the airbag 6 relative to the second pipe 3 can be further improved.

[0032] As a preferred technical solution of the present application, a first abutting plate 12 is provided on the air injection cylinder 7. One end of the spring 9 abuts against the piston rod 8, and the other end abuts against the first abutting plate 12. The position of the first abutting plate 12 in the length direction of the air injection cylinder 7 is adjustable; By adjusting the position of the first abutting plate 12 in the length direction of the air injection cylinder 7, the elastic force of the spring 9 when the second pipe 3 is in the initial state is adjusted.

[0033] Further, by providing the first abutting plate 12 and making the position of the first abutting plate 12 adjustable in the length direction of the air injection cylinder 7, it is convenient to adjust the initial elastic force of the spring 9. Furthermore, during the process of injecting the contrast agent at high pressure, the spring 9 can have different deformations and the airbag 6 can have different amounts of gas. In this way, when the contrast agent is injected into the patient's body in a stable high-pressure state, there is still some gas retained in the airbag 6, and the spring 9 can still have compression or stretching margins, thereby facilitating the improvement of the smoothness of the flow of the contrast agent in the patient's body when the pressure provided by the high-pressure injection pump fluctuates, and at the same time improving the flexibility of the contrast agent injection device of the present application to adapt to different injection pressures.

[0034] As a preferred technical solution of the present application, the first bottom plate 12 is threadedly connected to the inner wall of the air injection cylinder 7. By rotating the first bottom plate 12 relative to the air injection cylinder 7, the first bottom plate 12 can be moved along the length direction of the air injection cylinder 7.

[0035] Furthermore, by threadedly connecting the first bottom plate 12 to the inner wall of the air injection cylinder 7, the convenience of adjusting the position of the first bottom plate 12 along the length direction of the air injection cylinder 7 is further improved. At the same time, the stability of the position of the first bottom plate 12 relative to the air injection cylinder 7 is improved after the position adjustment.

[0036] As a preferred technical solution of the present application, a partition net 13 is provided at the end of the second pipeline 3 for communicating with the first pipeline 2. The partition net 13 is used to prevent the inflated airbag 6 from extending into the first pipeline 2; and the partition net 13 allows liquid to pass through.

[0037] Furthermore, by providing the partition net 13, when the partition net 13 allows liquid to pass through, it can prevent the inflated airbag 6 from extending into the first pipeline 2, thereby avoiding the influence of the airbag 6 on the movement of the first plug body 4, and further improving the smoothness of the movement of the first plug body 4 relative to the first pipeline 2.

[0038] Embodiment Three: On the basis of the technical solution of Embodiment Two, further, as shown in Figures 1-4 The piston rod 8 includes a piston 14 and a rod body 15. The piston 14 is in contact with the inner wall of the air injection cylinder 7. One end of the rod body 15 is connected to the piston 14, and the other end is used to abut against the first plug body 4.

[0039] Furthermore, by providing the piston 14 and the rod body 15, wherein the rod body 15 can be in a bent rod-shaped connection structure as shown in the figure, one end of the rod body 15 is connected to the piston 14, and the other end of the rod body 15 is used to abut against the first plug body 4, so that the first plug body 4 can push the piston rod 8 to move, or the rod body 15 can push the first plug body 4 to move.

[0040] As a preferred technical solution of the present application, a joint 16 is provided at the end of the second pipeline 3 far from the first pipeline 2. The joint 16 is used to connect the second pipeline 3 to the indwelling needle.

[0041] Furthermore, by providing the joint 16, the second pipeline 3 and the indwelling needle can be connected, so as to facilitate the injection of the contrast agent into the patient's body through the indwelling needle. The function of the joint 16 is to improve the stability of the connection between the indwelling needle and the second pipeline. At the same time, as a medium for connecting the two pipelines, the specific structure of the joint 16 is prior art and will not be elaborated here.

[0042] The above embodiments are only used to illustrate the present invention and do not limit the technical solutions described in the present invention. Although the present specification has described the present invention in detail with reference to the above respective embodiments, the present invention is not limited to the above specific implementation manners. Therefore, any modification or equivalent replacement to the present invention; and all technical solutions and their improvements that do not depart from the spirit and scope of the invention are covered by the scope of the claims of the present invention.

Claims

1. A contrast agent injection device, characterized in that: The extension tube comprises a first pipe and a second pipe, the second pipe is connected to the side wall of the first pipe and communicates with the first pipe, a first plug body is arranged in the first pipe, the first plug body is in contact with the inner wall of the first pipe, an exhaust film is arranged on the first plug body, the exhaust film is used to allow gas to pass through the first plug body through the exhaust film, and prevent liquid from passing through the first plug body through the exhaust film; An airbag is arranged in the second pipe, the airbag is connected to an air injection cylinder, a piston rod and a spring are arranged in the air injection cylinder, the spring provides an initial elastic force to put the second pipe in an initial state, when the second pipe is in the initial state, the gas in the air injection cylinder is pressed into the airbag, so that the airbag fills the second pipe; The first plug body can move relative to the first pipe along the length direction of the first pipe, so that the first plug body can selectively abut against or separate from the piston rod; When the first plug body abuts against the piston rod and pushes the piston rod to move, the gas in the airbag is gradually drawn into the gas injection cylinder, causing the volume of the airbag to gradually decrease, and the first pipe and the second pipe are connected, so that the liquid in the first pipe can flow into the second pipe.

2. The contrast agent injection device according to claim 1, wherein: When the second pipeline is in an initial state and the first plug body is in a critical state of being against or separated from the piston rod, the first plug body blocks the second pipeline.

3. The contrast agent injection device according to claim 2, wherein: The first pipe is provided with a locking piece, and the locking piece is used to limit or release the limit of the first plug body; When the locking member is in a state of limiting the first plug body, the locking member constrains the movement of the first plug body, so that the first plug body is in a state of not abutting against the piston rod; When the locking member is in a state of releasing the limit of the first plug body, the movement of the first plug body is not restricted by the locking member, so that the first plug body can push the piston rod to move.

4. The contrast agent injection device according to claim 3, wherein: A first through hole is provided on the side wall of the first pipe, and the locking piece is located in the first through hole. The locking piece is pushed and pulled so that the locking piece extends out of the inner wall of the first pipe or retracts into the side wall of the first pipe; when the locking piece extends out of the inner wall of the first pipe, the locking piece is in a state of limiting the first plug body.

5. The contrast agent injection device according to claim 4, wherein: The airbag is in a strip shape and extends to both ends of the second pipe; The air bag is fixed on the inner wall of the second pipe.

6. The contrast agent injection device according to claim 5, characterized in that: The gas injection cylinder is provided with a first abutment plate, one end of the spring abuts against the piston rod, and the other end abuts against the first abutment plate, and the position of the first abutment plate along the length direction of the gas injection cylinder is adjustable; The elastic force of the spring when the second pipeline is in the initial state can be adjusted by adjusting the position of the first abutment plate along the length direction of the gas injection cylinder.

7. The contrast agent injection device according to claim 6, characterized in that: The first abutment plate is threadedly connected to the inner wall of the gas injection cylinder, and the first abutment plate is rotated relative to the gas injection cylinder to move along the length direction of the gas injection cylinder.

8. The contrast agent injection device according to claim 7, characterized in that: A partition net is provided at the end of the second pipe for communicating with the first pipe, and the partition net is used to prevent the inflated airbag from extending into the first pipe; and the partition net allows liquid to pass through.

9. The contrast agent injection device according to claim 8, characterized in that: The piston rod includes a piston and a rod body. The piston is in close contact with the inner wall of the air injection cylinder. One end of the rod body is connected to the piston, and the other end is used to abut against the first plug body.

10. The contrast agent injection device according to claim 9, characterized in that: A joint is provided at the end of the second pipe away from the first pipe. The joint is used to connect the second pipe to the indwelling needle.

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