A contrast injection device with self - adaptive adjustment of injection speed

Abstract

This application relates to the field of contrast injection technology, and specifically discloses a contrast injection device with self - adaptive adjustment of injection speed, which includes a frame body; a saline cylinder for containing physiological saline; a contrast cylinder for containing contrast agent; a mixing cylinder for containing contrast agent, physiological saline or a mixture of contrast agent and physiological saline; an injection tube, one end of the injection tube is connected to the mixing cylinder, and the other end of the injection tube is connected to a syringe; two connecting tubes are provided, one of the connecting tubes is connected between the saline cylinder and the mixing cylinder, and the other connecting tube is connected between the contrast cylinder and the mixing cylinder. One - way valves are provided on both the connecting tubes and the injection tube; an extrusion mechanism includes a push plate and a driving component, the push plate is slidably arranged in the mixing cylinder, and the driving component is used to drive the push plate to slide along the axis of the mixing cylinder so as to discharge the solution in the mixing cylinder or suck in the solution in the saline cylinder and the contrast cylinder. This application can simplify the injection process.

Description

Technical Field

[0001] The present application relates to the technical field of contrast injection, and in particular to a contrast injection device with adaptively adjusted injection speed. Background Art

[0002] At present, in the process of medical imaging examination, especially in CT enhanced scanning, angiography and other projects, it is necessary to inject contrast agents into the patient's body to improve the image contrast. Contrast agents, also known as contrast agents, are chemicals injected into human tissues or organs to enhance the image observation effect. The density of these products is higher or lower than that of the surrounding tissues, and the contrast formed can be used to display images with certain instruments. Contrast agents are one of the most commonly used drugs in interventional radiology operations, mainly used for the display of blood vessels and body cavities.

[0003] Usually, the contrast agent is injected through a contrast agent injection device, which includes a frame, a cylinder, a three-way valve and a needle. The cylinder is arranged on the frame, and two cylinders are arranged, one for storing contrast agent and the other for storing saline solution. A push rod is arranged inside the cylinder for sliding, and when the push rod slides, the external liquid medicine can be sucked in or the liquid medicine in the cylinder can be pushed out under the action of negative pressure. The three-way valve is connected between the two cylinders, and the other end of the three-way valve is connected to the needle, so that contrast agent, saline solution or a mixture of contrast agent and saline solution can be injected into the human body as needed.

[0004] When injecting a mixture of contrast agent and saline, the contrast agent and saline need to be mixed outside first, and additional containers and stirring rods are needed for mixing. After mixing, the mixture is injected into one of the cylinders and then injected. The process is relatively cumbersome and needs to be further optimized. Summary of the invention

[0005] In order to simplify the injection process, the present application provides a contrast injection device with adaptive adjustment of injection speed.

[0006] The present application provides a contrast injection device with adaptive injection speed adjustment, which adopts the following technical solution:

[0007] A contrast injection device with adaptive injection speed adjustment, comprising:

[0008] A frame; and a

[0009] A saline cylinder for containing normal saline;

[0010] A contrast cylinder, used for containing contrast medium;

[0011] A mixing cylinder, used for containing contrast medium, saline or a mixture of contrast medium and saline;

[0012] An injection tube, one end of the injection tube is connected to a mixing cylinder, and the other end of the injection tube is connected to a syringe.

[0013] There are two connecting tubes. One of the connecting tubes is connected between the saline cylinder and the mixing cylinder, and the other connecting tube is connected between the contrast agent cylinder and the mixing cylinder. One-way valves are provided on both the connecting tubes and the injection tube.

[0014] An extrusion mechanism includes a push plate and a driving assembly. The push plate is slidably disposed in the mixing cylinder, and the driving assembly is used to drive the push plate to slide along the axis of the mixing cylinder so that the solution in the mixing cylinder is discharged outward or the solutions in the saline cylinder and the contrast agent cylinder are inhaled.

[0015] By adopting the above technical solutions, when the push plate slides, under the action of negative pressure, the physiological saline in the saline cylinder and the contrast agent in the contrast agent cylinder can be inhaled into the mixing cylinder, so that the physiological saline and the contrast agent can be mixed in the mixing cylinder, thus avoiding the use of additional containers, thereby improving work efficiency and reducing operation complexity.

[0016] Optionally, a cut-off valve for controlling the opening and closing of the connecting tube is provided on each of the connecting tubes.

[0017] By adopting the above technical solutions, when it is necessary to inject physiological saline and contrast agent in sequence, the cut-off valve can play a role in separating the connecting tube, which helps the smooth progress of the solution injection process; therefore, this device can not only be used to inject a mixture of physiological saline and contrast agent, but also inject physiological saline and contrast agent successively, with stronger applicability.

[0018] Optionally, the driving assembly includes a rotary power member, a screw rod, a connecting block and a support rod. The rotary power member is disposed on the frame body, the screw rod is coaxially and fixedly connected to the output end of the rotary power member, the connecting block is slidably disposed on the frame body along the axis of the screw rod, the connecting block is threadedly connected to the screw rod, the support rod is disposed on the connecting block, and the support rod is fixedly connected to the push plate.

[0019] By adopting the above technical solutions, the rotary power member drives the screw rod to rotate. The rotation of the screw rod causes the connecting block to slide. The connecting block can drive the push plate to slide along the axis of the mixing cylinder through the support rod to realize the inhalation and discharge of the solution in the mixing cylinder; since a set of driving assemblies can realize the injection of contrast agent, physiological saline or a mixture of both, it helps to simplify the structure and reduce the cost of the device.

[0020] Optionally, the rotary power member is a servo motor, and a pressure sensor is disposed in the injection tube. The pressure sensor is electrically connected to the servo motor.

[0021] By adopting the above technical solution, the injection speed can be automatically adjusted according to the pressure change in the injection tube, realizing the adaptive adjustment of the injection speed, thereby improving the safety of the injection process.

[0022] Optionally, the support rod includes a fixed rod and a movable rod. The fixed rod is fixedly arranged on the connecting block. The movable rod is coaxially rotatably connected to the fixed rod. The push plate is fixedly connected to the movable rod. A stirring member is arranged on the push plate. External threads are arranged on the outer wall of the movable rod. An installation block is arranged on the frame body. A threaded hole adapted to the external threads is formed in the installation block. The movable rod is threadedly connected to the threaded hole, so that the movable rod can rotate around its own axis while sliding along with the fixed rod.

[0023] By adopting the above technical solution, the movable rod can rotate around its own axis while sliding along with the fixed rod, that is, the push plate can rotate while sliding, thereby driving the stirring member to rotate. Therefore, when the mixing cylinder inhales or discharges the solution, the internal solution can be stirred at the same time, making the normal saline and the contrast agent in the mixing cylinder mix more evenly, which helps to enhance the imaging effect after subsequent injection; since the process of inhaling and discharging the solution and the stirring process are carried out simultaneously, time loss can be reduced, which helps to improve work efficiency.

[0024] Optionally, the stirring member includes a stirring rod. An installation hole is formed in the push plate. The axis of the installation hole is parallel to the sliding direction of the push plate. The stirring rod movably passes through the installation hole.

[0025] By adopting the above technical solution, when the push plate slides, the push plate can slide relative to the stirring rod. Since the push plate will rotate at the same time, the push plate can drive the stirring rod to rotate, thereby stirring the solution in the mixing cylinder and accelerating the mixing of the solution.

[0026] Optionally, the stirring member includes stirring blades. A plurality of stirring blades are provided and arranged in a circumferential array. A plurality of through holes for liquid to pass through are formed in the stirring blades.

[0027] By adopting the above technical solution, the design of the through holes allows the solution to flow smoothly during the stirring process. While reducing the rotation resistance of the stirring blades, it helps to enhance the stirring effect, thereby improving the mixing efficiency and reducing the time required for mixing.

[0028] Optionally, a shielding assembly is arranged at the through hole of the stirring blade. The shielding assembly includes a blocking block and an elastic cord. The blocking block is slidably arranged on one side of the through hole. The blocking block is used to close the through hole. The elastic cord is fixedly connected between the inner wall of the through hole and the blocking block.

[0029] By adopting the above technical solution, when the push plate slides to suck the solution into the mixing cylinder, the push plate rotates in one direction. At this time, under the action of the resistance of the solution, the stopper can slide to the outside of the through hole, making the through hole in an open state. At this time, the stirring effect of the stirring blades on the solution can be enhanced; when the push plate slides to extrude the solution in the mixing cylinder, the push plate rotates in the reverse direction. At this time, under the action of the resistance of the solution and the restoring force of the elastic rope, the stopper can slide to a state where it abuts against the inner wall of the through hole, and the stopper closes the through hole. Therefore, the rotation of the stirring blades can drive the solution in each area to rotate, and the mixing between the solutions on both sides of the same stirring blade is weakened, thereby weakening the stirring effect of the stirring blades on the solution. Therefore, during the process of injecting the medicinal liquid into the human body, the stirring amplitude is too large, causing discomfort to the human body can be avoided.

[0030] Optionally, the stopper is in a frustum shape, and the inner wall of the through hole is provided with a conical surface adapted to the stopper.

[0031] By adopting the above technical solution, when the stopper abuts tightly against the inner wall of the through hole, the setting of the conical surface helps to enhance the sealing performance at the abutting part, which helps to ensure the closing effect of the stopper on the through hole.

[0032] Optionally, scale lines are provided on both the saline cylinder and the contrast agent cylinder.

[0033] By adopting the above technical solution, the scale lines provided on the saline cylinder and the contrast agent cylinder can visually display the volumes of the normal saline and the contrast agent, which is convenient for medical staff to accurately master the usage amount, thereby ensuring the accuracy of each injection dose.

[0034] In summary, the present application includes at least one of the following beneficial technical effects:

[0035] 1. The setting of the mixing cylinder provides a mixing space for the normal saline and the contrast agent. Therefore, this device can not only be used for the injection of the contrast agent, but also for the injection of the mixed solution of the contrast agent and the normal saline, with stronger applicability.

[0036] 2. After the two isolation valves sequentially close the corresponding connecting pipes, when the push plate slides towards the side away from the injection pipe each time, only the normal saline or the contrast agent can be sucked into the mixing cylinder. Therefore, the sequential injection of the normal saline and the contrast agent can be realized, further improving the applicability of the device.

[0037] 3. The push plate can rotate during the sliding process, and the push plate drives the stirring member to rotate, thereby stirring the solution in the mixing cylinder, which helps to enhance the mixing effect of the solution, and thus improve the imaging quality after injection. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 is the overall structural schematic diagram of Embodiment 1 of the present application;

[0039] Figure 2 is a cross-sectional view of Embodiment 1 of the present application;

[0040] Figure 3 is a schematic structural diagram of the driving assembly in Embodiment 1 of the present application;

[0041] Figure 4 is a schematic structural diagram for showing the installation position of the stirring blade in Embodiment 2 of the present application;

[0042] Figure 5 is a cross-sectional view of the stirring blade in Embodiment 2 of the present application;

[0043] Figure 6 is a cross-sectional view for showing the shielding assembly in Embodiment 3 of the present application;

[0044] Figure 7 is a schematic structural diagram after the stopper slides out in Embodiment 3 of the present application.

[0045] Reference numerals: 1, frame body; 11, mounting seat; 12, support leg; 121, roller; 13, mounting frame; 2, base; 3, brine cylinder; 4, contrast agent cylinder; 5, mixing cylinder; 6, injection tube; 61, syringe; 7, connecting tube; 71, one-way valve; 72, cut-off valve; 8, push plate; 81, mounting hole; 82, strip hole; 9, driving assembly; 91, servo motor; 92, screw rod; 93, connecting block; 94, support rod; 941, fixed rod; 9411, mounting groove; 942, movable rod; 9421, connecting cylinder; 10, stirring rod; 14, stirring blade; 141, through hole; 15, limiting rod; 16, mounting block; 17, shielding assembly; 171, stopper; 172, elastic cord; 18, scale line. Detailed Description of the Embodiments

[0046] The following further describes the present application in detail with reference to the attached Figure 1-7 drawings.

[0047] Embodiment 1

[0048] Embodiment 1 of the present application discloses a contrast injection device with self-adaptive adjustment of injection speed. Referring to Figure 1 , the contrast injection device with self-adaptive adjustment of injection speed includes a frame body 1, and the frame body 1 includes a mounting seat 11, support legs 12 and a mounting frame 13. The height direction of the mounting seat 11 is vertically arranged; the support legs 12 are fixedly connected to the bottom wall of the mounting seat 11, and a plurality of support legs 12 are arranged in a circumferential array; rollers 121 are provided at the ends of the support legs 12 to facilitate the movement of the device. The mounting frame 13 is arranged on the top of the mounting seat 11, and the mounting frame 13 mainly plays a supporting role.

[0049] A base 2 is rotatably connected to the mounting bracket 13, and a damping connection is provided between the base 2 and the mounting bracket 13. Thus, the base 2 can be rotated to the desired position as needed. A saline cylinder 3, a contrast agent cylinder 4, and a mixing cylinder 5 are provided on the base 2. Both the saline cylinder 3 and the contrast agent cylinder 4 are cylindrical structures, and one end of each of the saline cylinder 3 and the contrast agent cylinder 4 is fixedly connected to the base 2. An inlet and an exhaust port are provided on both the saline cylinder 3 and the contrast agent cylinder 4. A rotary cap is provided at the inlet, so that it is convenient to inject physiological saline or contrast agent after unscrewing the rotary cap. The setting of the exhaust port helps the solution to flow in and out smoothly. Scale lines 18 are provided on both the saline cylinder 3 and the contrast agent cylinder 4, so that it is convenient to observe the amount of solution inside. The mixing cylinder 5 is also fixedly connected to the base 2, and the mixing cylinder 5 is a closed cylindrical structure.

[0050] A connecting pipe 7 and an injection pipe 6 are fixedly connected to the mixing cylinder 5. Both the connecting pipe 7 and the injection pipe 6 are flexible hoses. There are two connecting pipes 7. One end of each of the two connecting pipes 7 is communicated with the inside of the mixing cylinder 5. One connecting pipe 7 away from the mixing cylinder 5 is communicated with the inside of the saline cylinder 3, and the other connecting pipe 7 away from the mixing cylinder 5 is communicated with the inside of the contrast agent cylinder 4. One-way valves 71 are provided on both connecting pipes 7, and the flow direction inside the one-way valve 71 on the connecting pipe 7 is the direction towards the mixing cylinder 5. One end of the injection pipe 6 is communicated with the inside of the mixing cylinder 5, and the other end of the injection pipe 6 is fixedly connected with a syringe 61, and the syringe 61 is used to be inserted into the human body. Thus, the solution in the saline cylinder 3 or the contrast agent cylinder 4 can enter the mixing cylinder 5 through the connecting pipe 7, and then the solution in the mixing cylinder 5 can flow into the human body along the injection pipe 6 and the syringe 61, thereby realizing the injection of the contrast agent. Among them, a one-way valve 71 is also provided on the injection pipe 6, and the flow direction inside the one-way valve 71 on the injection pipe 6 is the direction from the mixing cylinder 5 to the syringe 61. Thus, the setting of the one-way valve 71 on the injection pipe 6 enables the solution in the saline cylinder 3 and the contrast agent cylinder 4 to be more smoothly sucked into the mixing cylinder 5.

[0051] Furthermore, a cut-off valve 72 is provided on each connecting pipe 7. The cut-off valve 72 can be a ball valve, a cock valve or a globe valve. The cut-off valve 72 is used to control the opening and closing of the corresponding connecting pipe 7. When the cut-off valve 72 on the connecting pipe 7 close to the saline cylinder 3 is closed and the other cut-off valve 72 is opened, only the contrast agent in the contrast agent cylinder 4 can flow into the mixing cylinder 5, and then the contrast agent can be injected separately. When the cut-off valve 72 on the connecting pipe 7 close to the contrast agent cylinder 4 is closed and the other cut-off valve 72 is opened, only the physiological saline in the saline cylinder 3 can flow into the mixing cylinder 5, and then the physiological saline can be injected separately. Thus, the setting of the cut-off valve 72 enables this device to not only inject the mixed solution of physiological saline and contrast agent into the human body, but also perform sequential intermittent injection of physiological saline and contrast agent, so it can be applied to more situations.

[0052] Refer to Figure 2 andFigure 3 On one side of the mixing cylinder 5, an extrusion mechanism is further provided. The extrusion mechanism includes a push plate 8 and a driving assembly 9. The push plate 8 is a circular plate adapted to the cross-sectional shape of the mixing cylinder 5. The diameter of the push plate 8 is the same as the inner wall diameter of the mixing cylinder 5. Therefore, the circumferential side of the push plate 8 abuts against the inner wall of the mixing cylinder 5. The push plate 8 is slidably arranged in the mixing cylinder 5 along the axial direction of the mixing cylinder 5. The driving assembly 9 is arranged on one side of the push plate 8 and is used to drive the push plate 8 to slide.

[0053] The driving assembly 9 includes a rotary power member, a screw rod 92, a connecting block 93 and a support rod 94. The rotary power member is a servo motor 91, and the servo motor 91 is fixedly connected to the base 2. The screw rod 92 is coaxially and fixedly connected to the output shaft of the servo motor 91. The connecting block 93 is slidably arranged on the base 2 along the length direction of the screw rod 92. A limiting rod 15 parallel to the screw rod 92 is fixedly connected to the base 2. The connecting block 93 is slidably penetrated through the limiting rod 15, so that the connecting block 93 is slidably connected to the base 2. A threaded hole adapted to the screw rod 92 is formed in the connecting block 93, and the connecting block 93 is threadedly connected to the screw rod 92. The lead angle of the external thread on the screw rod 92 is smaller than the equivalent friction angle. Therefore, the threaded connection between the screw rod 92 and the connecting block 93 has a self-locking ability. The support rod 94 is parallel to the screw rod 92. One end of the support rod 94 is fixedly connected to the connecting block 93. The end of the support rod 94 far from the connecting block 93 is fixedly connected to the push plate 8.

[0054] Therefore, after the servo motor 91 is started, the screw rod 92 can be rotated. Under the guiding action of the limiting rod 15 on the connecting block 93, the rotation of the screw rod 92 can cause the connecting block 93 to slide. The connecting block 93 drives the push plate 8 to slide through the support rod 94. When the push plate 8 slides to the side away from the injection tube 6, due to the action of negative pressure, the physiological saline in the saline cylinder 3 and the contrast agent in the contrast cylinder 4 will be sucked into the mixing cylinder 5. When the push plate 8 slides to the side close to the injection tube 6, the push plate 8 can extrude the solution in the mixing cylinder 5, so as to inject the solution in the mixing cylinder 5 into the human body.

[0055] Wherein, a pressure sensor for detecting the internal liquid pressure is arranged in the injection tube 6, and a controller is arranged in the base 2. The controller is electrically connected to the pressure sensor and the servo motor 91 respectively. Therefore, the pressure sensor can timely transmit the liquid pressure at the end to the controller. When the liquid pressure is too high, the controller will reduce the rotation speed of the output shaft of the servo motor 91, thereby reducing the injection pressure and ensuring the safety of the injection process.

[0056] The support rod 94 includes a fixed rod 941 and a movable rod 942. One end of the fixed rod 941 is fixedly connected to the connecting block 93, and an installation groove 9411 is coaxially formed at the end of the fixed rod 941 away from the connecting block 93; the installation groove 9411 is a cylindrical groove, and the diameter of the installation groove 9411 is the same as the rod diameter of the movable rod 942. One end of the movable rod 942 is inserted into the installation groove 9411, and the movable rod 942 is rotatably connected to the cylindrical groove. The end of the movable rod 942 away from the fixed rod 941 penetrates into the mixing cylinder 5 and is fixedly connected to the push plate 8.

[0057] A connecting cylinder 9421 is fixedly arranged on the outer wall of the movable rod 942, and an external thread is arranged on the outer wall of the connecting cylinder 9421; an installation block 16 is fixedly connected to the base 2, and a threaded hole adapted to the external thread on the connecting cylinder 9421 is formed in the installation block 16, and the threaded hole in the installation block 16 is threadedly connected to the outer wall of the connecting cylinder 9421. The lead angle of the external thread on the connecting cylinder 9421 is greater than the equivalent friction angle, so the threaded connection between the connecting cylinder 9421 and the threaded hole in the installation block 16 does not have a self-locking ability. When the servo motor 91 is started, it can drive the connecting block 93 to slide, the connecting block 93 drives the fixed rod 941 to slide, the fixed rod 941 drives the movable rod 942 to slide, and under the threaded fit between the connecting cylinder 9421 on the outer wall of the movable rod 942 and the installation block 16, the movable rod 942 can rotate around its own axis when sliding, that is, the push plate 8 can rotate during the sliding process.

[0058] Referring to Figure 2 , stirring members are arranged on the push plate 8, and the stirring members include a plurality of stirring rods 10. Installation holes 81 are formed in the push plate 8, and the axis of the installation holes 81 is parallel to the axis of the push plate 8; there are a plurality of installation holes 81 which are arranged at equal intervals, and each installation hole 81 corresponds to a stirring rod 10. The aperture of the installation hole 81 is the same as the rod diameter of the stirring rod 10, and the stirring rod 10 is inserted into the corresponding installation hole 81, so that the push plate 8 can slide relative to the stirring rod 10. Therefore, when the push plate 8 rotates, it can drive the stirring rod 10 to rotate, thereby stirring the solution in the mixing cylinder 5 through the stirring rod 10, which helps to accelerate the mixing of the solution.

[0059] The implementation principle of Embodiment 1 is as follows: First, normal saline and contrast agent are respectively injected into the corresponding saline cylinder 3 and contrast agent cylinder 4. Then, both partition valves 72 are in the open state. The servo motor 91 is started, and the servo motor 91 drives the screw 92 to rotate. The rotation of the screw 92 causes the connecting block 93 to slide, the connecting block 93 drives the fixed rod 941 to slide, and the fixed rod 941 drives the movable rod 942 to slide; the movable rod 942 slides away from the injection tube 6, so that the normal saline in the saline cylinder 3 and the contrast agent in the contrast agent cylinder 4 can be sucked into the mixing cylinder 5 for preliminary mixing. Under the threaded connection and cooperation between the connecting cylinder 9421 and the mounting block 16, the movable rod 942 can rotate while sliding, so that the push plate 8 can rotate while sliding. The push plate 8 drives the stirring rod 10 to rotate, so as to stir the mixed liquid during the process of sucking the solution into the mixing cavity, which helps to enhance the mixing effect and thus improve the subsequent imaging quality.

[0060] Then the output shaft of the servo motor 91 rotates in the reverse direction, so that the push plate 8 slides towards the injection tube 6. Then the push plate 8 can extrude the mixed liquid in the mixing cylinder 5, and the extruded mixed liquid can be injected into the human body through the injection tube 6 and the syringe 61, so as to realize the injection of the mixed liquid of normal saline and contrast agent.

[0061] Embodiment 2

[0062] Refer to Figure 4 and Figure 5 This embodiment is different from Embodiment 1 in that the stirring member in this embodiment includes a plurality of stirring blades 14, and the stirring blades 14 are arranged in a circular array. A plurality of strip holes 82 are formed in the push plate 8, and each strip hole 82 corresponds to a stirring blade 14. The stirring blade 14 slidably penetrates through the corresponding strip hole 82, so that the push plate 8 can slide relative to the stirring blade 14; since the stirring blade 14 abuts against the inner wall of the strip hole 82, the push plate 8 can drive the stirring blade 14 to rotate when it rotates. Since the area of the stirring blade 14 is large, it can contact the mixed liquid more fully, which helps to enhance the stirring effect.

[0063] A plurality of through holes 141 are formed in each stirring blade 14. Since part of the solution in the mixing cylinder 5 can pass through the through holes 141, the liquid eddy current can be enhanced, which helps to further enhance the mixing effect of normal saline and contrast agent.

[0064] Embodiment 3

[0065] Refer to Figure 6 and Figure 7, The difference between this embodiment and Embodiment 2 is that in this embodiment, a shielding component 17 for adjusting the opening and closing of the perforations 141 is provided on the stirring blade 14. There are multiple groups of shielding components 17, and the number of shielding components 17 is the same as the number of perforations 141. Each group of shielding components 17 corresponds to one perforation 141.

[0066] The shielding component 17 includes a stopper 171 and an elastic cord 172. The stopper 171 is frustum-shaped and is slidably disposed on one side of the perforation 141 of the stirring blade 14. There are two cord holes opened on the stirring blade 14. The cord holes are holes penetrating through the stirring blade 14 and are respectively located on both sides of the perforation 141. The elastic cord 172 has elasticity and can return to its original length after being stretched and losing the external force; there are two elastic cords 172, which are respectively passed through the two cord holes. One end of the elastic cord 172 is fixedly connected to the end of the cord hole, and the other end of the elastic cord 172 passes through the cord hole and is fixedly connected to the frustum surface of the stopper 171. Under normal conditions, the elastic cord 172 is in its original length. At this time, the stopper 171 abuts against the inner wall of the perforation 141, and the perforation 141 is in a closed state. When the stopper 171 slides out of the perforation 141, the elastic cord 172 is in a stretched state, and the perforation 141 is in an open state.

[0067] Therefore, when the output shaft of the servo motor 91 rotates forward, the push plate 8 slides toward the side away from the injection tube 6, sucking the solution into the mixing cylinder 5; while the push plate 8 slides, the push plate 8 will rotate in one direction. The rotation of the push plate 8 drives the stirring blade 14 to rotate. Under the resistance of the liquid in the mixing cylinder 5, the stopper 171 will overcome the elasticity of the elastic cord 172 and slide outward from the perforation 141. At this time, the perforation 141 is in an open state, which helps to enhance the stirring effect of the stirring blade 14 on the solution in the mixing cylinder 5.

[0068] After the required solution is sucked into the mixing cylinder 5, the output shaft of the servo motor 91 stops rotating. At this time, the elastic cord 172 will cause the stopper 171 to slide toward the side close to the perforation 141 until the stopper 171 abuts against the inner wall of the perforation 141, thereby closing the perforation 141.

[0069] When the output shaft of the servo motor 91 rotates in the reverse direction, the push plate 8 slides toward the side close to the injection tube 6, squeezing out the solution in the mixing cylinder 5; while the push plate 8 slides, the push plate 8 will rotate in the other direction. The rotation of the push plate 8 drives the stirring blade 14 to rotate. Since the stopper 171 is frustum-shaped, the stopper 171 will continuously abut against the inner wall of the perforation 141, closing the perforation 141; therefore, during the process of injecting the solution in the mixing cylinder 5 into the human body, the stirring process in the mixing cylinder 5 is weakened, which can avoid the discomfort caused to the human body during the injection process due to strong eddy currents, and helps to ensure the safety of the injection process.

[0070] The above are optional embodiments of the present application, and do not limit the protection scope of the present application. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A contrast injection device with self - adaptive adjustment of injection speed, characterized in that, Comprising: A frame body (1); And a saline cylinder (3) arranged on the frame body (1) for containing physiological saline; A contrast agent cylinder (4) for containing a contrast agent; A mixing cylinder (5) for containing a contrast agent, physiological saline or a mixture of a contrast agent and physiological saline; An injection tube (6), one end of the injection tube (6) is connected to the mixing cylinder (5), and a syringe needle (61) is connected to the other end of the injection tube (6); Two connecting tubes (7) are provided. One of the connecting tubes (7) is connected between the saline cylinder (3) and the mixing cylinder (5), and the other connecting tube (7) is connected between the contrast agent cylinder (4) and the mixing cylinder (5). One-way valves (71) are provided on both the connecting tube (7) and the injection tube (6); An extrusion mechanism, including a push plate (8) and a driving assembly (9). The push plate (8) is slidably arranged in the mixing cylinder (5). The driving assembly (9) is used to drive the push plate (8) to slide along the axis of the mixing cylinder (5) so that the solution in the mixing cylinder (5) is discharged outward or the solutions in the saline cylinder (3) and the contrast agent cylinder (4) are inhaled; The driving assembly (9) includes a rotary power member, a screw rod (92), a connecting block (93) and a support rod (94). The rotary power member is arranged on the frame body (1). The screw rod (92) is coaxially and fixedly connected to the output end of the rotary power member. The connecting block (93) is slidably arranged on the frame body (1) along the axial direction of the screw rod (92). The connecting block (93) is threadedly connected to the screw rod (92). The support rod (94) is arranged on the connecting block (93), and the support rod (94) is fixedly connected to the push plate (8); The support rod (94) includes a fixed rod (941) and a movable rod (942). The fixed rod (941) is fixedly arranged on the connecting block (93). The movable rod (942) is coaxially and rotatably connected to the fixed rod (941). The push plate (8) is fixedly connected to the movable rod (942). A stirring member is arranged on the push plate (8). External threads are arranged on the outer wall of the movable rod (942). An installation block (16) is arranged on the frame body (1). A threaded hole adapted to the external threads is provided in the installation block (16). The movable rod (942) is threadedly connected to the threaded hole so that the movable rod (942) can rotate around its own axis while sliding along with the fixed rod (941); The stirring member includes stirring blades (14). A plurality of stirring blades (14) are provided and are arranged in a circumferential array. A plurality of through holes (141) for liquid to pass through are provided in the stirring blades (14); A shielding assembly (17) is arranged at the through holes (141) on the stirring blades (14). The shielding assembly (17) includes a blocking block (171) and an elastic rope (172). The blocking block (171) is slidably arranged on one side of the through hole (141). The blocking block (171) is used to close the through hole (141). The elastic rope (172) is fixedly connected between the inner wall of the through hole (141) and the blocking block (171). ​ 2. The contrast injection device with self - adaptive adjustment of injection speed according to claim 1, characterized in that: A cut-off valve (72) for controlling the opening and closing of each connecting pipe (7) is provided on each of the connecting pipes (7).

3. An injection contrast agent device with self - adaptive adjustment of injection speed according to claim 1, characterized in that: The rotary power member is a servo motor (91), a pressure sensor is arranged in the injection pipe (6), and the pressure sensor is electrically connected to the servo motor (91).

4. The contrast injection device with self - adaptive adjustment of injection speed according to claim 1, characterized in that: The stopper (171) is frustum-shaped, and the inner wall of the through hole (141) is arranged as a conical surface adapted to the stopper (171).

5. An injection contrast device with self - adaptive injection speed adjustment according to claim 1, characterized in that: Scale lines (18) are provided on both the saline cylinder (3) and the contrast agent cylinder (4).

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