Contrast agent injection device

Abstract

The present invention relates to the field of medical device technology, and specifically to a contrast agent injection device, comprising an extension tube, the extension tube comprising a first pipe and a second pipe, a first plug body being provided in the first pipe, an exhaust membrane being provided on the first plug body; an air bag being provided in the second pipe, the air bag being connected to an air injection cylinder, a piston rod and a spring being provided in the air injection cylinder, the spring providing an initial elastic force to place 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 air bag, causing the air bag to fill the second pipe; when the first plug body abuts against the piston rod and pushes the piston rod to move, the gas in the air bag is gradually drawn into the air injection cylinder, causing the volume of the air bag to gradually decrease, and causing the first pipe to be connected to the second pipe. A contrast agent injection device of the present application can reduce the probability of 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 radiographic examination.

Description

Technical Field

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

[0002] A contrast agent injection device is a specialized medical diagnostic device primarily used for medical imaging procedures such as angiography, enhanced CT scans, and MRIs. Typically, a contrast agent injection device includes a syringe, an aspirator, and connecting tubing. It is used in conjunction with a high-pressure syringe pump to automatically inject contrast agent, ensuring clarity and accuracy in imaging examinations.

[0003] However, in actual work, the inventors found that the current contrast agent injection device still has shortcomings, specifically:

[0004] When using a high-pressure injection pump to vent the contrast agent injection device or disconnecting the indwelling needle after the contrast examination, a few drops of contrast agent are usually inevitable from the end of the extension tube of the contrast agent injection device. This can easily cause contamination of the CT machine, MRI machine, high-pressure injection pump, surrounding environment and ground. The staff are often too busy to clean it in time, which makes it more difficult to clean it later. In severe cases, it may even damage the expensive CT machine or MRI machine.

[0005] Therefore, how to reduce the probability of contrast agent dripping from the extension tube end of the contrast agent injection device when venting the contrast agent injection device or disconnecting the indwelling needle after the contrast examination is a technical problem that needs to be solved urgently. Summary of the Invention

[0006] The purpose of the present invention is to provide a contrast agent injection device to reduce the probability of contrast agent dripping from the end of the extension tube of the contrast agent injection device when the contrast agent injection device is vented or the indwelling needle is disconnected after the contrast examination, in order to address the current problem that a few drops of contrast agent inevitably drip from the end of the extension tube of the contrast agent injection device when the contrast agent injection device is vented or the indwelling needle is disconnected after the contrast examination.

[0007] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0008] A contrast agent injection device includes an extension tube, the extension tube including a first pipe and a second pipe, the second pipe being connected to a side wall of the first pipe and communicating with the first pipe, a first plug being disposed within the first pipe, the first plug being in contact with the inner wall of the first pipe, and a vent membrane being disposed on the first plug, the vent membrane being configured to allow gas to pass through the first plug through the vent membrane and to prevent liquid from passing through the first plug through the vent membrane;

[0009] An airbag is provided in the second pipe, and the airbag is connected to a gas injection cylinder. A piston rod and a spring are provided in the gas injection cylinder. The spring provides an initial elastic force to keep the second pipe in an initial state. When the second pipe is in the initial state, the gas in the gas injection cylinder is pressed into the airbag, so that the airbag fills the second pipe;

[0010] 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 contact or separate from the piston rod;

[0011] 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 air injection cylinder, causing the volume of the airbag to gradually decrease, and the first pipe and the second pipe to be connected, so that the liquid in the first pipe can flow into the second pipe.

[0012] As a preferred technical solution of the present application, when the second pipeline is in an initial state and the first plug is in a critical state of being against or separated from the piston rod, the first plug blocks the second pipeline.

[0013] As a preferred technical solution of the present application, a locking member is provided on the first pipe, and the locking member is used to limit or release the limit of the first plug body;

[0014] 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;

[0015] 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.

[0016] As the priority technical solution of this application, 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. By pushing and pulling the locking piece, the locking piece is extended out of the inner wall of the first pipe or retracted 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.

[0017] As a preferred technical solution of this application, the airbag is in a strip shape and extends to both ends of the second pipe;

[0018] The air bag is fixed on the inner wall of the second pipe.

[0019] As a preferred technical solution of this application, a first abutment plate is provided on the gas injection cylinder, 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;

[0020] 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.

[0021] 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.

[0022] 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.

[0023] As the preferred technical solution of this 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.

[0024] 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.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. In the solution of the present application, before venting the contrast agent injection device, the first pipe is first placed in a vertical position, and the first plug is placed in a position not abutting the piston rod. Then, the contrast agent in the contrast agent injection device is urged to flow, so that the contrast agent is gradually injected into the first pipe of the extension tube. Because the venting membrane functions to exhaust air without discharging liquid, the gas in the first pipe can be discharged into the external environment through the venting membrane. During the specific operation, medical personnel can control the flow rate of the contrast agent injected into the extension tube so that the first plug is stationary or slightly displaced relative to the first pipe while the gas is being discharged. This prevents the first plug from pushing the piston rod during the venting process. In this way, the gas in the first pipe is easily discharged before the first and second pipes are connected.

[0027] Then, after the gas in the first pipe 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 in the direction close to 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 drawn into the gas injection cylinder, causing the volume of the elastic airbag to gradually shrink, and the airbag gradually releases the filling of the second pipe, causing the second pipe to gradually change from a blocked state to a conductive state. At the same time, the first pipe and the second pipe are connected, allowing the contrast agent in the first pipe to flow out through the second pipe; in this way, When the inflated balloon fills the second channel, the second channel is completely blocked by the balloon, so that no gas exists in the second channel. When the first channel and the second channel are connected, the balloon releases the blockage of the second channel, allowing the contrast agent to flow from the first channel to the second channel. During the flow of the contrast agent, the gas can be prevented from flowing with the contrast agent, and the gas can be prevented from being transferred into the patient when the contrast agent in the extension tube is subsequently injected into the patient. In this way, when the contrast agent injection device is vented, the probability of contrast agent dripping from the end of the extension tube of the contrast agent injection device can be reduced.

[0028] At the same time, during the subsequent 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 applies a force to the first plug body to balance the elastic force of the spring, so that when the contrast agent is in a stable pressure state, the first plug body can be kept stationary relative to the first pipe, and the position of the first plug body relative to the first pipe remains unchanged. When the pressure provided by the high-pressure injection pump fluctuates, the elastic force of the spring can adapt to the pressure fluctuation and change, so that the inflation degree of the airbag and the position of the first plug body change, thereby playing a buffering role, reducing the pressure fluctuation amplitude when the contrast agent is injected into the patient's body, thereby improving the stability of the contrast agent injection;

[0029] The spring then pushes the piston rod back into the air bag, which in turn pushes the first stopper back into the air bag, and the second stopper back into the air bag, which in turn pushes the second stopper back into the air bag.

[0030] 2. Furthermore, when the second channel is in its initial state and the first plug is in a critical state of contact with or separation from the piston rod, the first plug seals the second channel. After the radiographic examination is completed, when the spring gradually recovers its deformation and the second channel returns to its initial state, the first plug moves relative to the first channel under the pushing action of the piston rod, causing the first plug to seal the second channel. This provides a double layer of protection to reduce the chance of contrast agent dripping from the end of the extension tube. The first layer of protection is the airbag filling the second channel to completely fill the second channel, and the second layer of protection is the first plug sealing the second channel to prevent the contrast agent in the first channel from flowing into the second channel.

[0031] 3. Furthermore, by configuring the airbag in a strip shape, it is generally easier for the airbag to expand to fill the interior of the second pipe after inflation, thereby making it easier for the inflated airbag to completely block the second pipe, further improving the sealing effect of the airbag on the second pipe. At the same time, by fixing the airbag to the inner wall of the second pipe, the stability of the airbag relative to the second pipe can be further improved.

[0032] 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, and then during the high-pressure injection of contrast agent, the spring can have different deformation amounts and different amounts of gas in the airbag. 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, so as 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 improve 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

[0033] Figure 1 This is a schematic cross-sectional view of one embodiment of a contrast agent injection device of the present application;

[0034] Figure 2 This is a structural schematic diagram of one embodiment of a contrast agent injection device of the present application, in which the second conduit is in an initial state and the first plug is in a critical state of abutting against or separating from the piston rod;

[0035] Figure 3 This is a structural schematic diagram of one embodiment of a contrast agent injection device of the present application when the first pipe and the second pipe are connected;

[0036] Figure 4This is a schematic diagram of the three-dimensional structure of one embodiment of a contrast agent injection device of the present application;

[0037] Markings in the figure: 1-extension tube, 2-first pipe, 3-second pipe, 4-first plug body, 5-exhaust membrane, 6-air bag, 7-gas injection cylinder, 8-piston rod, 9-spring, 10-locking piece, 11-first through hole, 12-first stop plate, 13-spacer, 14-piston, 15-rod body, 16-connector. DETAILED DESCRIPTION

[0038] To make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them.

[0039] 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 derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0040] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions therein may be combined with each other.

[0041] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0042] In the description of the present invention, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the inventive product is typically placed when in use, or the orientations or positional relationships commonly understood by those skilled in the art. Such terms are intended solely to facilitate the description of the present invention and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" and the like are used solely for distinction and should not be construed as indicating or implying relative importance.

[0043] Example 1: This example provides a contrast agent injection device, see Figures 1-4As shown, the extension tube 1 includes a first pipe 2 and a second pipe 3. The second pipe 3 is connected to the side wall of the first pipe 2 and communicates with the first pipe 2. A first plug 4 is provided in the first pipe 2. The first plug 4 is in contact with the inner wall of the first pipe 2. A vent membrane 5 is provided on the first plug 4. The vent membrane 5 is used to allow gas to pass through the first plug 4 through the vent membrane 5 and prevent liquid from passing through the first plug 4 through the vent membrane 5.

[0044] An airbag 6 is provided in the second pipe 3, and the airbag 6 is connected to a gas injection cylinder 7. A piston rod 8 and a spring 9 are provided in the gas injection cylinder 7. The spring 9 provides an initial elastic force to keep the second pipe 3 in an initial state. When the second pipe 3 is in the initial state, the gas in the gas injection cylinder 7 is pressed into the airbag 6, so that the airbag 6 fills the second pipe 3.

[0045] The first plug body 4 can move relative to the first pipe 2 along the length direction of the first pipe 2, so that the first plug body 4 can selectively contact or separate from the piston rod 8;

[0046] When the first plug body 4 abuts against the piston rod 8 and pushes the piston rod 8 to move, the gas in the airbag 6 is gradually drawn into the gas injection cylinder 7, causing the volume of the airbag 6 to gradually shrink, and the first pipe 2 and the second pipe 3 to be connected, so that the liquid in the first pipe 2 can flow into the second pipe 3.

[0047] In the present application, before exhausting the contrast agent injection device, the first pipe 2 is first placed in a vertical state, and the first plug body 4 is placed in a state where it does not abut against the piston rod 8. 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 pipe 2 in the extension tube 1. Under the action of the exhaust membrane 5 that exhausts but does not discharge liquid, the gas in the first pipe 2 can be discharged into the external environment through the exhaust membrane 5. During the specific operation, the medical staff can control the flow rate of the contrast agent injected into the extension tube 1 so that the first plug body 4 is stationary or slightly displaced relative to the first pipe 2 while the gas is exhausted, thereby avoiding the first plug body 4 from pushing the piston rod 8 to move while exhausting; in this way, it is convenient to exhaust the gas in the first pipe 2 before the first pipe 2 and the second pipe 3 are connected;

[0048] Then, after the gas in the first pipe 2 is discharged, as the contrast agent is continuously injected, the contrast agent pushes the first plug body 4 to move, causing the first plug body 4 to move in the direction close to the piston rod 8 until the first piston pushes the piston rod 8 to move. In this way, when the first piston pushes the piston rod 8, the gas in the airbag 6 is gradually drawn into the gas 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 pipe 3, causing the second pipe 3 to gradually change from a blocked state to a conductive state. At the same time, the first pipe 2 and the second pipe 3 are connected, so that the contrast agent in the first pipe 2 can flow out through the second pipe 3; Therefore, when the inflatable balloon 6 fills the second pipe 3, the second pipe 3 is completely blocked by the balloon 6, so that no gas exists in the second pipe 3. When the first pipe 2 and the second pipe 3 are connected, the balloon 6 releases the blockage of the second pipe 3, allowing the contrast agent to flow from the first pipe 2 to the second pipe 3. During the process of contrast agent flow, the gas can be prevented from flowing with the contrast agent, and further, when the contrast agent in the extension tube 1 is subsequently injected into the patient's body, the gas can be prevented from being transferred into the patient's body. In this way, when the contrast agent injection device is vented, the probability of contrast agent dripping from the end of the extension tube 1 of the contrast agent injection device can be reduced.

[0049] At the same time, during the subsequent injection process, the high-pressure injection pump injects the contrast agent into the patient's body under high pressure, and the contrast agent in the high-pressure state applies a force to the first plug body 4 to balance the elastic force of the spring 9, so that when the contrast agent is in a stable pressure state, the first plug body 4 can be kept stationary relative to the first pipe 2, and the position of the first plug body 4 relative to the first pipe 2 remains unchanged. When the pressure provided by the high-pressure injection pump fluctuates, the elastic force of the spring 9 can adapt to the pressure fluctuation and change, so that the inflation degree of the airbag 6 and the position of the first plug body 4 change, thereby playing a buffering role to reduce the pressure change amplitude when the contrast agent is injected into the patient's body, thereby 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, so that the first plug body 4 further pushes the piston rod 8 to move, and the elastic force of the spring 9 is further increased, so that the gas in the airbag 6 is further extracted, thereby further increasing the pressure of the second pipe 3 The cross-sectional area for contrast agent flow in the second pipe 3 is reduced. 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 contrast agent flow in the second pipe 3, the pressure change amplitude when the contrast agent flows out from the end of the second pipe 3 away from the first pipe 2 can be reduced; similarly, when the pressure provided by the high-pressure injection pump suddenly decreases, the spring 9 can restore part of its deformation, so that the piston rod 8 moves relative to the gas injection cylinder 7 under the action of the deformation of the spring 9, so that part of the gas in the gas injection cylinder 7 is injected into the airbag 6 to increase the amount of gas in the airbag 6, thereby reducing the cross-sectional area for contrast agent flow in the second pipe 3. At the same time, the piston rod 8 can push the first plug body 4 in the opposite direction to reduce the length of the pipe for contrast agent flow in the first pipe 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 contrast agent flow in the second pipe 3, the pressure change amplitude when the contrast agent flows out from the end of the second pipe 3 away from the first pipe 2 can be reduced.

[0050] Moreover, after the radiographic examination is completed, the high-pressure injection pump can be stopped first, so that 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 gas injection cylinder 7 is gradually injected into the airbag 6, so that the airbag 6 gradually fills the second pipe 3. In the process of gradually increasing the volume of the airbag 6, the moving first plug body 4 and the airbag 6 with increased 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 pipe 3 is in its initial state, the airbag 6 fills the second pipe 3, so that the second pipe 3 is completely blocked by the airbag 6, and the injection operation of the contrast agent into the body is stopped. Then, when the indwelling needle is disconnected, the second pipe 3 can be in a state of being completely filled with the airbag 6. In this way, the probability or situation of contrast agent dripping from the end of the extension tube 1 of the contrast agent injection device is reduced or even avoided, thereby reducing the probability of damage to the CT machine or MRI machine and facilitating the staff to clean the surrounding environment after the examination is completed.

[0051] In the present application, the exhaust membrane 5 is a membrane structure that allows gas to pass through and prevents liquid from passing through. The specific structure of the exhaust membrane 5 is prior art and will not be described in detail here.

[0052] As a preferred technical solution of the present application, when the second pipe 3 is in the initial state and the first plug 4 is in a critical state of abutting against or separating from the piston rod 8 , the first plug 4 blocks the second pipe 3 .

[0053] Furthermore, when the second pipe 3 is in the initial state and the first plug 4 is in a critical state of being against or separated from the piston rod 8, the first plug 4 blocks the second pipe 3. Therefore, after the angiographic examination is completed, when the spring 9 gradually recovers its deformation and the second pipe 3 returns to its initial state, the first plug 4 moves relative to the first pipe 2 under the pushing action of the piston rod 8. Therefore, in this case, the first plug 4 is in a state of blocking the second pipe 3. 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 1. The first layer of protection is that the airbag 6 fills the second pipe 3 to completely fill the second pipe 3, and the second layer of protection is that the first plug 4 blocks the second pipe 3 to prevent the contrast agent in the first pipe 2 from flowing into the second pipe 3.

[0054] As a preferred technical solution of the present application, a locking member 10 is provided on the first pipe 2, and the locking member 10 is used to limit or release the limit of the first plug body 4;

[0055] When the locking member 10 is in a state of limiting the first plug body 4, the locking member 10 constrains the movement of the first plug body 4 so that the first plug body 4 is not in a state of abutting against the piston rod 8;

[0056] When the locking member 10 is in a state of releasing the limit on 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.

[0057] Furthermore, by providing a 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 the state of limiting the first plug body 4, the locking member 10 constrains the movement of the first plug body 4, so that the first plug body 4 can always be in a state of not abutting against the piston rod 8. In this way, when exhausting the extension tube 1, the locking member 10 can be first placed in the state of limiting the first plug body 4, and then the exhaust operation can be performed, so as to prevent the first plug body 4 from pushing the piston rod 8 during exhaust.

[0058] 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 is extended out of the inner wall of the first pipe 2 or retracted 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.

[0059] Furthermore, by providing the first through hole 11 , when pushing or 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 .

[0060] Example 2: Based on the technical solution of Example 1, further, see Figures 1-4 As shown, the airbag 6 is strip-shaped and extends to both ends of the second pipe 3;

[0061] The airbag 6 is fixed on the inner wall of the second pipe 3 .

[0062] Furthermore, by setting the airbag 6 in a strip shape, generally after the airbag 6 is inflated, it is more conducive to the airbag 6 expanding to a state that fills the interior of the second pipe 3, so that it is more conducive to the inflated airbag 6 to completely block the second pipe 3, further improving the effect of the airbag 6 blocking 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.

[0063] As a preferred technical solution of this application, a first abutment plate 12 is provided on the gas injection cylinder 7. One end of the spring 9 abuts against the piston rod 8, and the other end abuts against the first abutment plate 12. The position of the first abutment plate 12 along the length direction of the gas injection cylinder 7 is adjustable.

[0064] By adjusting the position of the first abutment plate 12 along the length direction of the gas injection cylinder 7 , the elastic force of the spring 9 when the second pipeline 3 is in the initial state can be adjusted.

[0065] Furthermore, by providing a first support plate 12 and making the position of the first support plate 12 adjustable along the length direction of the gas injection cylinder 7, it is convenient to adjust the initial elastic force of the spring 9, and then in the process of high-pressure injection of contrast agent, the spring 9 can have different deformation amounts and the airbag 6 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 6, and the spring 9 can still have a compression or stretching margin, so as 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 improve the flexibility of the contrast agent injection device of the present application when used to adapt to different injection pressures.

[0066] As a preferred technical solution of this application, the first abutment plate 12 is threadedly connected to the inner wall of the gas injection cylinder 7 , and the first abutment plate 12 is rotated relative to the gas injection cylinder 7 to move along the length direction of the gas injection cylinder 7 .

[0067] Furthermore, by threading the first support plate 12 onto the inner wall of the gas injection cylinder 7, the convenience of adjusting the position of the first support plate 12 along the length direction of the gas injection cylinder 7 is further improved, and at the same time, the stability of the position of the first support plate 12 relative to the gas injection cylinder 7 is improved after the position adjustment.

[0068] As a preferred technical solution of this application, a partition net 13 is provided at the end of the second pipe 3 for communicating with the first pipe 2. The partition net 13 is used to prevent the inflated airbag 6 from extending into the first pipe 2; and the partition net 13 allows liquid to pass through.

[0069] Furthermore, by setting up a partition net 13, the partition net 13 can prevent the inflated airbag 6 from extending into the first pipe 2 when allowing liquid to pass through, thereby avoiding the airbag 6 from affecting the movement of the first plug body 4, thereby improving the smoothness of the first plug body 4 when moving relative to the first pipe 2.

[0070] Example 3: Based on the technical solution of Example 2, further, see Figures 1-4 As shown, the piston rod 8 includes a piston 14 and a rod body 15 . The piston 14 fits against the inner wall of the gas 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 .

[0071] Furthermore, by providing a piston 14 and a rod body 15, the rod body 15 can be a bent rod-shaped structure as shown in the figure, so that 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 pushes the piston rod 8 to move, or the rod body 15 pushes the first plug body 4 to move.

[0072] As a preferred technical solution of the present application, a connector 16 is provided on the end of the second tube 3 away from the first tube 2 , and the connector 16 is used to connect the second tube 3 to the indwelling needle.

[0073] Furthermore, a connector 16 is provided to connect the second tube 3 and the indwelling needle, thereby facilitating the injection of contrast agent into the patient's body through the indwelling needle. The function of the connector 16 is to improve the stability of the connection between the indwelling needle and the second tube. At the same time, the connector 16 serves as a medium for connecting the two tubes. The specific structure of the connector 16 is prior art and will not be described here.

[0074] The above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Although this specification has described the present invention in detail with reference to the above embodiments, the present invention is not limited to the above specific implementation methods. Therefore, any modification or equivalent replacement of the present invention; and all technical solutions and improvements thereof that do not depart from the spirit and scope of the invention are included in the scope of the claims of the present invention.

Claims

1. A contrast agent injection device, characterized in that: The extension tube includes a first pipe and a second pipe, the second pipe being connected to a side wall of the first pipe and communicating with the first pipe, a first plug being disposed in the first pipe, the first plug being in contact with the inner wall of the first pipe, and a vent membrane being disposed on the first plug, the vent membrane being configured to allow gas to pass through the first plug through the vent membrane and to prevent liquid from passing through the first plug through the vent membrane; An airbag is provided in the second pipe, and the airbag is connected to a gas injection cylinder. A piston rod and a spring are provided in the gas injection cylinder. The spring provides an initial elastic force to keep the second pipe in an initial state. When the second pipe is in the initial state, the gas in the gas 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 contact 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 air injection cylinder, causing the volume of the airbag to gradually decrease, and the first pipe and the second pipe to be connected, so that the liquid in the first pipe can flow into the second pipe.

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

3. A contrast agent injection device according to claim 2, characterized in that: 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. A contrast agent injection device according to claim 3, characterized in that: 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. By pushing and pulling the locking piece, the locking piece is extended out of the inner wall of the first pipe or retracted 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. A contrast agent injection device according to claim 4, characterized in that: 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. A 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. A 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. A contrast agent injection device according to claim 7, characterized in that: A partition net is provided at the end portion 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. A contrast agent injection device according to claim 8, characterized in that: The piston rod comprises a piston and a rod body. The piston is fitted with 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.

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

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