Liquid medicine delivery device and contrast injector

Abstract

The application discloses a medicine liquid conveying device and a contrast injection device. The medicine liquid conveying device and the contrast injection device comprise a limiting piece, a center disc, a power piece and a squeezing wheel. The power piece is used for driving at least one of the center disc and the limiting piece, so that the center disc and the limiting piece rotate relatively. The squeezing wheel is installed on the center disc or the limiting piece through a first shaft or a first mounting groove. A gap is formed between the squeezing wheel and the limiting piece, between the squeezing wheel and the center disc or between different squeezing wheels. The gap is used for embedding a hose. The center disc and the limiting piece can at least squeeze the hose located in the gap through the squeezing wheel during relative rotation, so as to convey the medicine liquid in the hose. The squeezing wheel rotates by relying on the hose friction during the process of squeezing the hose. The upper limit of the rotating speed of the center disc is 300 revolutions per minute. Alternatively, the rotating speed of the center disc satisfies the condition that the flow rate of the medicine liquid in the hose is between 1ml / s and 30ml / s. The above scheme can simplify the structure and has high precision.

Description

Technical Field

[0001] The present application relates to the technical field of peristaltic pumps, and in particular to a liquid medicine delivery device and an angiography injector. Background Art

[0002] Infusion is a common medical treatment, and syringes typically utilize pumps to power the delivery of medication. Hose pumps fall under the category of peristaltic pumps. Peristaltic pumps are a type of rotor-type positive displacement pump, named for their operating principle, which mimics the peristaltic movement of gas, solid, and liquid phases in the digestive tract.

[0003] A hose pump consists of a housing, a support plate, a squeeze roller mounted on the support plate, a transmission mechanism, and a drive motor. The hose pump delivers liquid from a hose. The drive motor drives the support plate through the transmission mechanism, while also driving the squeeze roller via gears. This roller cooperates with the housing's wall to squeeze or release the hose, resulting in a complex structure and high precision requirements. Summary of the Invention

[0004] The main technical problem solved by the present application is to provide a drug liquid delivery device and an angiography injector, which can simplify the structure and have high precision.

[0005] In order to solve the above problems, the first aspect of the present application provides a liquid medicine delivery device, which includes: a limit member, a center disk, a power member and an extrusion wheel; wherein the power member is used to drive at least one of the center disk and the limit member to make the center disk and the limit member rotate relative to each other; the extrusion wheel is installed on the center disk or the limit member through a first axis or a first mounting groove, and a gap is formed between the extrusion wheel and the center disk, or between different extrusion wheels, and the gap is used to embed a hose, and during the relative rotation of the center disk and the limit member, the hose located in the gap can be squeezed at least by the extrusion wheel to deliver the liquid medicine in the hose; the extrusion wheel relies on the friction of the hose to rotate during the process of squeezing the hose; the upper limit of the rotation speed of the center disk is 300 rpm, or the rotation speed of the center disk meets the condition: so that the flow rate of the liquid medicine in the hose is between 1ml / s and 30ml / s.

[0006] In one embodiment, the drug liquid delivery device includes a plurality of first bearings, the number of the extrusion wheels and the first shafts are both several, the extrusion wheels are arranged in a one-to-one correspondence with the first bearings and the first shafts, the plurality of first shafts are distributed at intervals around the axis of the center disk, the first shaft is connected to the center disk, and the plurality of extrusion wheels are assembled one by one on the plurality of first shafts through the plurality of first bearings.

[0007] In one embodiment, an assembly space for accommodating the first bearing is provided in the extrusion wheel, the first bearing is arranged in the assembly space, and the outer ring of the first bearing is fixed to the inner wall corresponding to the assembly space of the extrusion wheel, and the inner ring of the first bearing is sleeved on the outer circumferential wall of the first shaft; a first limiting portion and a second limiting portion are respectively provided at both axial ends of the assembly space of the extrusion wheel, and the first limiting portion and the second limiting portion are used to limit the first bearing from axially disengaging from the extrusion wheel.

[0008] In one embodiment, the first limiting portion is a limiting edge extending radially from the inner wall of the extrusion wheel toward its axis, and the limiting edge has a first through hole, and the maximum diameter of the first through hole is smaller than the outer diameter of the first bearing, so that the limiting edge abuts one end of the first bearing; the second limiting portion is an annular sheet with a notch, and the inner diameter of the annular sheet is smaller than the outer diameter of the first bearing, so that the annular sheet abuts the other end of the first bearing; an annular groove is provided on the inner wall of the extrusion wheel at a position corresponding to the annular sheet, the width of the annular groove matches the thickness of the annular sheet, the outer diameter of the annular groove is larger than the outer diameter of the first bearing, and the edge of the annular sheet is inserted into the annular groove to be fixed on the extrusion wheel.

[0009] In one embodiment, a plurality of first fixing grooves are provided on the center disk, and the first fixing grooves are arranged in one-to-one correspondence with the first shaft; the first shaft includes a first shaft body and a second shaft body coaxially connected, the first shaft body is accommodated in the first fixing groove, the second shaft body protrudes from the center disk, and the outer diameter of the second shaft body is smaller than the outer diameter of the first shaft body, the first bearing is sleeved on the second shaft body, so that the extrusion wheel can be installed on the center disk, and one end of the first bearing is limited by the first shaft body close to the second shaft body.

[0010] In one embodiment, the first shaft is further provided with a first locking hole; the liquid medicine delivery device further includes a first connecting member, the first connecting member including a first locking shaft and a first limiting end coaxially connected, the first locking shaft is accommodated in the first locking hole and fixed to one end of the first shaft facing the extrusion wheel, the first limiting end protrudes from the first bearing, the outer diameter of the first limiting end is larger than the outer diameter of the first locking shaft and larger than the inner diameter of the first bearing, so that the other end of the first bearing is limited by the first limiting end close to the side of the first locking shaft.

[0011] In an embodiment, the center disc is provided with a second through hole corresponding to the first locking hole, the second through hole is communicated with the first fixing groove, and the diameter of the second through hole is smaller than the diameter of the first fixing groove and the first shaft body, so as to form a step between the second through hole and the first fixing groove, the step axially limits the first shaft body; the liquid medicine delivery device further comprises a second connecting member, the second connecting member comprises a second locking shaft and a second limiting end, the second locking shaft is accommodated in the second through hole and the first locking hole, and is fixed at one end of the first shaft body away from the extrusion wheel, the second limiting end protrudes from the second through hole, the outer diameter of the second limiting end is greater than the outer diameter of the second locking end and the outer diameter of the second through hole, so as to axially limit the first shaft body in the second direction, and the second direction is opposite to the first direction.

[0012] In an embodiment, the limiting member does not rotate; the liquid medicine delivery device further comprises a transmission shaft, an input end of the transmission shaft is in transmission connection with the power member, and an output end of the transmission shaft is connected with the center disc, and the extrusion wheel and the limiting member are located on one side of the center disc to form the gap; the power member drives the center disc to rotate through the transmission shaft, and the rotation of the center disc drives the plurality of extrusion wheels and the limiting member to cooperate to alternately extrude and loosen the hose.

[0013] In an embodiment, the limiting member is an annular member with a notch, one side of the notch is the input end of the hose, and the other side of the notch is the output end of the hose, and the size of the gap is different within the range from the input end of the hose to the output end of the hose.

[0014] In an embodiment, the plurality of extrusion wheels are equidistantly arranged along the axis of the center disc.

[0015] To solve the above problems, the second aspect of the present application provides a contrast injector, comprising the liquid medicine delivery device of any one of the first aspect.

[0016] In an embodiment, the center disc is provided with a second through hole corresponding to the first locking hole, the second through hole is communicated with the first fixing groove, and the diameter of the second through hole is smaller than the diameter of the first fixing groove and the first shaft body, so as to form a step between the second through hole and the first fixing groove, the step axially limits the first shaft body; the liquid medicine delivery device further comprises a second connecting member, the second connecting member comprises a second locking shaft and a second limiting end, the second locking shaft is accommodated in the second through hole and the first locking hole, and is fixed at one end of the first shaft body away from the extrusion wheel, the second limiting end protrudes from the second through hole, the outer diameter of the second limiting end is greater than the outer diameter of the second locking end and the outer diameter of the second through hole, so as to axially limit the first shaft body in the second direction, and the second direction is opposite to the first direction.

[0017] In an embodiment, the center disc does not rotate; the extrusion wheel is installed on the limiting member through a first shaft or a first installation slot, the limiting member is sleeved on the periphery of the center disc, so that the gap is formed between the extrusion wheel and the periphery of the center disc; the power member drives the limiting member to rotate around the center disc.

[0018] In an embodiment, the upper surface of the center disc protrudes from the upper surface of the limiting member, the first shaft is arranged on the upper surface of the limiting member, and the extrusion wheel is rotatably arranged on the first shaft; the power member includes a motor and a first gear connected with the motor, and the limiting member is arranged with a toothed pattern matched with the first gear on the side close to the center disc, so as to drive the limiting member to rotate through the power member.

[0019] In an embodiment, the liquid medicine delivery device further includes a plurality of guide wheels rotatably connected to the center disc or the limiting member through a second shaft or a second installation slot, and the second shaft or the second installation slot is arranged on the center disc or the limiting member; the guide wheels are used to limit the hose in the gap.

[0020] In an embodiment, the number of the guide wheels and the extrusion wheels is multiple; one extrusion wheel is arranged between two adjacent guide wheels, so that the guide wheels and the extrusion wheels are alternately arranged on the same center disc or limiting member, or the guide wheels are arranged on the center disc, the extrusion wheels are arranged on the limiting member, and one guide wheel is arranged on the limiting member at a position corresponding to two adjacent extrusion wheels.

[0021] In an embodiment, the pressure of the liquid medicine in the hose is 300 psi at most, and / or the flow accuracy of the liquid medicine is 5%.

[0022] In order to solve the above problems, the application further provides a contrast injection device, which includes the liquid medicine delivery device of any one of the above embodiments.

[0023] In the above scheme, the drug delivery device and the angiographic injector include: a limit member, a center disk, a power member and an extrusion wheel; wherein the power member is used to drive at least one of the center disk and the limit member to make the center disk and the limit member rotate relative to each other; the extrusion wheel is installed on the center disk or the limit member through the first axis or the first mounting groove, so that a gap can be formed between the extrusion wheel and the limit member, between the extrusion wheel and the center disk, or between different extrusion wheels, and the gap is used to embed the hose, and then during the relative rotation of the center disk and the limit member, the hose located in the gap can be squeezed at least by the extrusion wheel, and at the same time, the extrusion wheel relies on the friction of the hose to achieve rotation during the process of squeezing the hose, without the need for additional gears or drive motors, thereby greatly simplifying the structure; since the rotation of the extrusion wheel is not the active party but the driven party relative to the hose, the rotation speed is determined by the hose, so there is no wear problem caused by the speed mismatch between the hose and the extrusion wheel, and there is no problem of insufficient speed accuracy of the extrusion wheel. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] in:

[0026] Figure 1 Schematic diagram of a liquid medicine delivery device in one embodiment.

[0027] Figure 2 for Figure 1 Exploded view of the liquid drug delivery device shown.

[0028] Figure 3 for Figure 1 Schematic diagram of the central disc, extrusion wheel and guide wheel in the liquid medicine delivery device.

[0029] Figure 4 for Figure 3 Exploded view of the center disc, squeeze wheel and part of the guide wheel.

[0030] Figure 5 for Figure 1 Schematic diagram of the extrusion wheel in the liquid medicine delivery device shown.

[0031] Figure 6 for Figure 5 Exploded view of the extrusion wheel shown.

[0032] Figure 7 for Figure 1 A top view of the drug delivery device shown.

[0033] Figure 8 for Figure 7 AA section view in.

[0034] Figure 9 for Figure 8 Enlarged schematic diagram of part B in the middle.

[0035] Figure 10 for Figure 8 Enlarged schematic diagram of part C in the middle.

[0036] Figure 11 Schematic diagram of a drug delivery device in another embodiment.

[0037] Figure 12 Schematic diagram of a liquid medicine delivery device in yet another embodiment.

[0038] Figure 13 Schematic diagram of the hose coordination of a liquid medicine delivery device in yet another embodiment.

[0039] Figure 14 FIG. 2 is a schematic cross-sectional view BB of a drug delivery device in yet another embodiment.

[0040] Description of the drawings: 100, housing; 110, mounting groove; 120, stopper; 121, notch; 122, tooth pattern; 130, mounting channel;

[0041] 200, center plate; 210, first mounting hole; 220, first fixing slot; 230, second through hole; 240, second fixing slot; 250, through hole;

[0042] 300, connecting plate; 310, connecting portion; 320, countersunk hole; 330, first fixing hole; 340, second fixing hole;

[0043] 400, transmission shaft; 410, stop surface; 420, output end; 421, positioning surface; 430, third fixing hole; 520, adjustment member; 610, second bearing;

[0044] 710, first connecting member; 711, first locking shaft; 712, first limiting end; 720, second connecting member; 721, second locking shaft; 722, second limiting end; 730, third connecting member;

[0045] 800, extrusion wheel; 810, assembly space; 820, annular groove; 830, first bearing; 860, first limiting portion; 861, limiting edge; 862, first through hole; 840, first shaft; 841, first shaft body; 842, second shaft body; 843, first locking hole; 850, second limiting portion;

[0046] 900, guide wheel; 910, guide groove; 920, second axis; 921, third axis; 922, fourth axis; 923, second locking hole; 924, limit edge;

[0047] 1000. Motor; 1001. First gear. DETAILED DESCRIPTION

[0048] The following describes the embodiments of the present application in detail with reference to the accompanying drawings.

[0049] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The terms "first" and "second" in this article are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. The term "and / or" in this article is merely a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the related objects before and after are in an "or" relationship. In addition, "many" in this article means two or more than two.

[0050] An embodiment of the present invention provides a liquid medicine delivery device, which is a hose pump primarily used for delivering liquids. When used with a contrast agent injector, the liquid medicine delivery device of this embodiment can reliably and stably deliver liquid medicine in the hose at a specific pressure. The liquid medicine can be a liquid medium such as a contrast agent or sodium chloride solution.

[0051] See also Figure 1The liquid medicine delivery device may include a limiter 120, a center disk 200, a power member, and an extrusion wheel 800. The power member is used to drive at least one of the center disk 200 and the limiter 120, causing the center disk 200 and the limiter 120 to rotate relative to each other. The extrusion wheel 800 is mounted on the center disk 200 or the limiter 120 via a first shaft 840 or a first mounting slot, thereby forming a gap between the extrusion wheel 800 and the limiter 120, between the extrusion wheel 800 and the center disk 200, or between different extrusion wheels 800. The gap is used to insert a hose, and then, during the relative rotation of the center disk 200 and the limiter 120, the hose located in the gap can be squeezed at least by the extrusion wheel 800 to deliver the liquid medicine in the hose. In addition, the extrusion wheel 800 is driven by the friction of the hose to achieve rotation during the extrusion of the hose. In the above scheme, during the relative rotation of the center disk 200 and the limit member 120, the hose located in the gap can be squeezed at least by the extrusion wheel 800. At the same time, the extrusion wheel 800 is driven by the friction of the hose to realize rotation during the process of squeezing the hose, and no additional gears or drive motor are required, which greatly simplifies the structure. Since the rotation of the extrusion wheel 800 is not the active party but the driven party relative to the hose, the rotation speed is determined by the hose. Therefore, there is no problem of wear caused by speed mismatch between the hose and the extrusion wheel 800, and there is no problem of insufficient speed accuracy of the extrusion wheel 800.

[0052] In this embodiment, the upper limit of the rotation speed of the center disk 200 can be 300 rpm, or the rotation speed of the center disk 200 can meet the condition that the flow rate of the liquid medicine in the hose is between 1 ml / s and 30 ml / s. It is understood that when the center disk 200 is rotating, the upper limit of the rotation speed is 300 rpm, and the specific rotation speed can be adjusted as needed. When the center disk 200 is not rotating and the rotation speed is 0, the limiter 120 rotates, and the flow rate of the liquid medicine in the hose can be between 1 ml / s and 30 ml / s. Alternatively, the center disk 200 and the limiter 120 can both rotate, and the flow rate of the liquid medicine in the hose can be between 1 ml / s and 30 ml / s, etc., without specific limitations here. In one embodiment, the rotation speed of the center disk 200 meets the condition that the flow rate of the liquid medicine in the hose is between 1 ml / s and 15 ml / s. In this embodiment, the gap embedded in the hose can be formed in different ways to achieve a variety of ways to squeeze the hose to deliver liquid medicine. Furthermore, due to the aforementioned configuration, the maximum pressure of the liquid medicine within the hose can be 300 psi, or other pressure values ​​are also possible. In the liquid medicine delivery device, the liquid medicine flow rate accuracy can be controlled to within 5% regardless of the volume of the injected liquid medicine.

[0053] like Figure 1As shown, in an actual scenario, the drug liquid delivery device includes a limit member 120, a center disk 200, a power member and an extrusion wheel 800. The first shaft 840 or the first mounting groove is provided on the center disk 200, and the extrusion wheel 800 is installed on the center disk 200 through the first shaft 840 or the first mounting groove, so that a gap for embedding the hose is formed between the extrusion wheel 800 and the limit member 120. The power member is used to drive the center disk 200 to rotate, while the limit member 120 remains stationary, so that the center disk 200 and the limit member 120 rotate relative to each other. Based on this, during the relative rotation of the center disk 200 and the limit member 120, the rotation of the center disk 200 can drive the extrusion wheel 800 on the center disk 200 to crush the hose in the gap between the extrusion wheel 800 and the limit member 120, thereby realizing the delivery of the drug liquid. Combined with Figure 4 As shown, the extrusion wheel 800 can be mounted on the central disk 200 or the stopper 120 via the first shaft 840 or the first mounting groove. Meanwhile, the extrusion wheel 800 rotates due to the friction of the hose during the extrusion process, thereby enabling the extrusion wheel 800 to rotate on its own. This can reduce the resistance of the extrusion wheel 800 when extruding the hose, thereby ensuring the stability and reliability of the operation of the extrusion wheel 800.

[0054] In an actual scenario, the power member may include a component that provides power, such as a motor 1000, which is not specifically limited here. For example, in an embodiment where the limiting member 120 does not rotate but the center disk 200 rotates, in order to drive the center disk 200 to rotate, the liquid medicine delivery device may further include a transmission shaft 400, the input end of the transmission shaft 400 being transmission-connected to the power member, the output end 420 of the transmission shaft 400 being connected to the center disk 200, and a gap being formed between the extrusion wheel 800 and the side of the limiting member 120 facing the center disk 200, so that the power member drives the center disk 200 to rotate via the transmission shaft 400. The rotation of the center disk 200 can drive multiple extrusion wheels 800 to cooperate with the limiting member 120 to alternately squeeze and release the hose. Alternating squeezing and releasing of the hose can occur by: after one squeezing wheel 800 squeezes the hose, the rotation of the center disk 200 drives the same squeezing wheel 800 to rotate and release the hose. The next squeezing wheel 800 squeezes the hose again, thereby enabling multiple squeezing wheels 800 to alternately squeeze and release the same hose as the center disk 200 rotates. Alternatively, the gap between the squeezing wheel 800 and the stopper 120 can change in size as the squeezing wheel 800 rotates relative to the stopper 120, allowing the same squeezing wheel 800 to squeeze or release the hose with varying pressures. Because rotational motion is transmitted solely through the drive shaft 400, the structure is simple, reliable, and has a low failure rate.

[0055] See next Figures 1-10 The liquid medicine delivery device shown is an example. A more detailed description of the liquid medicine delivery device is provided. Some of the contents are also applicable toFigure 11 and Figure 12 Liquid drug delivery device.

[0056] In one embodiment, the liquid medicine delivery device may include a plurality of first shafts 830, a plurality of extrusion wheels 800, and a plurality of first shafts 840. The extrusion wheels 800 are disposed in a one-to-one correspondence with the first bearings 830 and the first shafts 840. The plurality of first shafts 840 are spaced apart around the axis of the center disk 200. The first shafts 840 are connected to the center disk 200, and the plurality of extrusion wheels 800 are assembled one-to-one on the plurality of first shafts 840 via the plurality of first bearings 830. The extrusion wheels 800 are assembled one-to-one on the plurality of first shafts 840 via the plurality of first bearings 830. The extrusion wheels 800 are rotatable relative to the center disk 200, enabling the extrusion wheels 800 to rotate when engaging with the stopper 120 to extrude the hose, thereby ensuring the stability and reliability of the operation of the extrusion wheels 800. The first shafts 840 are fixedly connected to the center disk 200 and assembled on the first shafts 840 via the first bearings 830, enabling the extrusion wheels 800 to rotate.

[0057] like Figure 5 、 6As shown in Figures 10 and 10, an assembly space 810 for accommodating a first bearing 830 is provided within the extrusion wheel 800. The first bearing 830 is disposed in the assembly space 810, and the outer ring of the first bearing 830 is fixed to the inner wall corresponding to the assembly space 810 of the extrusion wheel 800. The inner ring of the first bearing 830 is sleeved on the outer peripheral wall of the first shaft 840. A first limiting portion 860 and a second limiting portion 850 are respectively provided at the axial ends of the assembly space 810 of the extrusion wheel 800. The first limiting portion 860 and the second limiting portion 850 are used to limit the first bearing 830 from axially separating from the extrusion wheel 800. The first limiting portion 860 and the second limiting portion 850 are provided on the extrusion wheel 800 and are used to prevent the first bearing 830 from separating from the extrusion wheel 800. The first limiting portion 860 and the second limiting portion 850 can restrain the first bearing 830 on the extrusion wheel 800 to prevent the first bearing 830 from separating from the extrusion wheel 800, thereby reliably mounting the extrusion wheel 800 on the center disk 200. Therefore, the first bearing 830 can be quickly and reliably installed on the extrusion wheel 800. The first bearing 830 is completely accommodated in the assembly space 810 of the extrusion wheel 800, making the arrangement of the first bearing 830 on the extrusion wheel 800 more stable and more conducive to the self-rotation of the extrusion wheel 800 via the first bearing 830. The outer ring of the first bearing 830 is fixed to the inner wall corresponding to the assembly space 810 of the extrusion wheel 800, and the inner ring of the first bearing 830 is sleeved on the outer peripheral wall of the first shaft 840. Therefore, the first shaft 840 and the extrusion wheel 800 are slidably connected via the first bearing 830, thereby allowing the extrusion wheel 800 to rotate under force. As can be understood, taking the example of a central disk 200 that rotates to drive the extrusion wheels 800 in circular motion, thereby enabling the multiple extrusion wheels 800 to alternately squeeze or release the hose, the extrusion wheels 800 can apply radial force to the hose upon approaching the hose, thereby cooperating with the stopper 120 to squeeze the hose. Due to the circular motion of the extrusion wheels 800, the extrusion wheels 800 also generate tangential friction with the hose. By rotating, the extrusion wheels 800 can convert the sliding friction between the extrusion wheels 800 and the hose into rolling friction between the extrusion wheels 800 and the hose, thereby eliminating friction with the hose to a certain extent and ensuring that the extrusion wheels 800 and the hose do not cause displacement. Therefore, the self-rotation ability of the extrusion wheels 800 is particularly important. Thus, the provision of the first bearing 830 can reduce the friction coefficient during the self-rotation of the extrusion wheels 800 and ensure the self-rotation accuracy of the extrusion wheels 800, thereby reducing frictional heat between the extrusion wheels 800 and the hose, reducing damage to the hose and extending the service life of the hose.

[0058] In one embodiment, the first limiting portion 860 is a limiting edge 861 extending radially toward the axis of the extrusion wheel 800 from the inner wall thereof. The limiting edge 861 has a first through-hole 862. The maximum diameter of the first through-hole 862 is smaller than the outer diameter of the first bearing 830, so that the limiting edge 861 abuts one end of the first bearing 830. The second limiting portion 850 is a ring with a notch. The inner diameter of the ring is smaller than the outer diameter of the first bearing 830, so that the ring abuts the other end of the first bearing 830. An annular groove 820 is provided on the inner wall of the extrusion wheel 800 at a position corresponding to the ring. The width of the annular groove 820 matches the thickness of the second limiting portion 850. The outer diameter of the annular groove 820 is larger than the outer diameter of the first bearing 830. The edge of the ring is inserted into the annular groove 822 to secure it to the extrusion wheel 800. The second limiting portion 850 may be a retaining spring.

[0059] In one embodiment, the center disk 200 is provided with a plurality of first fixing slots 220, each corresponding to the first shaft 840. The first shaft 840 includes a first shaft body 841 and a second shaft body 842 coaxially connected. The first shaft body 841 is received in the first fixing slots 220, while the second shaft body 842 protrudes from the center disk 200. The outer diameter of the second shaft body 842 is smaller than that of the first shaft body 841. The first bearing 830 is sleeved on the second shaft body 842 to enable the extrusion wheel 800 to be mounted on the center disk 200. One end of the first bearing 830 is restrained by the first shaft body 841 on the side of the second shaft body 842. The arrangement of the first shaft 840 being partially received in the first fixing slots 220 improves the stability of the first shaft 840 when mounted on the center disk 200, thereby improving the stability of the first bearing 830 when mounted on the center disk 200 via the first shaft 840.

[0060] The first shaft 840 is also provided with a first locking hole 843; the drug delivery device also includes a first connecting member 710, the first connecting member 710 includes a first locking shaft 711 and a first limiting end 712 coaxially connected, the first locking shaft 711 is accommodated in the first locking hole 843 and fixed to the end of the first shaft 840 facing the extrusion wheel 800, the first limiting end 712 protrudes from the first bearing 830, and the outer diameter of the first limiting end 712 is larger than the outer diameter of the first locking shaft 711 and larger than the inner diameter of the first bearing 830, so that the other end of the first bearing 830 is limited by the first limiting end 712 close to the side of the first locking shaft 711.

[0061] In one embodiment, a second through hole 230 is provided on the center disk 200 at a position corresponding to the first locking hole 843. The second through hole 230 is connected to the first fixed groove 220, and the diameter of the second through hole 230 is smaller than the diameter of the first fixed groove 220 and the first shaft body 841 to form a step between the second through hole 230 and the first fixed groove 220. The step performs a first axial limit on the first shaft body 841. The drug delivery device also includes a second connecting member 720, which includes a second locking shaft 721 and a second limiting end 722. The second locking shaft 721 is accommodated in the second through hole 230 and the first locking hole 843 and is fixed to the end of the first shaft 840 facing away from the extrusion wheel 800. The second limiting end 722 protrudes from the second through hole 230. The outer diameter of the second limiting end 722 is larger than the outer diameter of the second locking shaft 721 and larger than the outer diameter of the second through hole 230, thereby limiting the first shaft body 841 in a second axial direction opposite to the first axial direction. By limiting the first shaft body 841 in the second axial direction, the first shaft 840 is locked in the first fixing groove 220.

[0062] The stopper 120 can be an annular member with a notch 121. One side of the notch 121 is the hose input end, and the other side is the hose output end. The size of the notch varies from the hose input end to the hose output end. For example, the multiple extrusion wheels 800 can be arranged at equal distances from the axis of the central disk 200.

[0063] In one embodiment, a through-hole 250 is defined at the axis of the center disk 200. The drug delivery device further includes a connecting disk 300 having a plurality of connecting portions 310 spaced apart around the axis of the connecting disk 300, with the axial distance between the connecting portion 310 and the connecting disk 300 greater than the radius of the through-hole 250. The connecting disk 300 is located on one side of the center disk 200. The output end 420 of the transmission shaft 400 enters the through-hole 250 from the other side of the center disk 200, penetrates the center disk 200, and is fixedly connected to the connecting disk 300. The connecting disk 300 is fixedly connected to the center disk 200 via a counterbore 320 in the connecting portion 310. The arrangement of the output end 420 of the transmission shaft 400 entering the through-hole 250 from the other side of the center disk 200 further enhances the connection strength of the center disk 200 after being assembled to the output end 420 of the transmission shaft 400. The connecting disk 300 is also provided with a countersunk hole 320, which is arranged on the side of the connecting disk 300 away from the center disk 200 and is arranged around the connecting portion 310, so that the connecting disk 300 is conveniently fixedly connected to the center disk 200 through the countersunk hole 320 in the connecting portion 310, and the connecting disk 300 is fixedly connected to the center disk 200 through the countersunk hole 320 in the connecting portion 310, which can firmly realize the connection and fixation of the center disk 200 and the connecting disk 300, and the axial distance from the connecting portion 310 to the connecting disk 300 is greater than the radius of the through hole 250, which can maximize the stability and reliability of the connection structure between the center disk 200 and the connecting disk 300. In addition, a positioning surface 421 is provided on the output end 420 of the transmission shaft 400 and is connected to the first fixing hole 330 on the connecting disk 300. A third connecting member 730 is fixed to the center disk 200 through the second fixing hole 340 on the connecting disk 300. A third limiting end is provided on the upper end of the third connecting member 730 to limit the connecting disk 300. The liquid medicine delivery device may also include a housing 100, and a limiting member 120 is provided at the edge of the top of the housing 100. A mounting groove 110 is provided on the housing 100, and the input end of the transmission shaft 400 is connected to the power member in a transmission manner. The output end 420 of the transmission shaft 400 is connected to the center disk 200 through the connecting disk 300. The provision of the connecting disk 300 can enhance the structural strength of the connection between the transmission shaft 400 and the center disk 200, thereby improving the stability and reliability of the assembly of the center disk 200. The drug delivery device may further include a plurality of second bearings 610. To improve the stability of the transmission shaft 400 during rotation, the transmission shaft 400 is supported in the mounting groove 110 by the plurality of second bearings 610. On the one hand, the support of the transmission shaft 400 by the plurality of second bearings 610 can improve the stability of the rotation of the transmission shaft 400, thereby improving the stability of the rotation of the center disk 200. On the other hand, the stable connection between the transmission shaft 400 and the center disk 200 by the connecting disk 300 can improve the structural strength of the connection between the center disk 200 and the transmission shaft 400, thereby improving the stability and reliability of the assembly of the transmission shaft 400 and the center disk 200 in the mounting groove 110.The connecting disk 300 is provided with a plurality of connecting portions 310, and the center disk 200 is provided with a plurality of first mounting holes 210, which are arranged in a one-to-one correspondence with the connecting portions 310. The third connecting member 730 can penetrate the connecting portion 310 and be connected and fixed to the first mounting holes 210 to fix the connecting disk 300 to the center disk 200. The connecting disk 300 is also provided with a countersunk hole 320, which is arranged on the side of the connecting disk 300 facing away from the center disk 200 and is arranged around the connecting portion 310. When the third connecting member 730 is a screw or bolt, the end of the screw or bolt can be received in the countersunk hole 320.

[0064] In one embodiment, the transmission shaft 400 may include a stop surface 410 and an output end 420. The stop surface 410 is used to axially abut against the connecting disk 300 to prevent the transmission shaft 400 from axially moving. The output end 420 is a connecting protrusion protruding from the stop surface 410. A first fixing hole 330 is provided on the connecting disk 300 near the side of the transmission shaft 400. The output end 420 can be plugged into the first fixing hole 330 for fixing. Figure 2 The output end 420 is provided with a positioning surface 421, which can abut against the inner wall of the first fixing hole 330 to prevent the connecting plate 300 from rotating relative to the transmission shaft 400. Figure 2 and Figure 5 The connecting disk 300 is provided with a second fixing hole 340 on a side facing away from the transmission shaft 400. The second fixing hole 340 can communicate with the first fixing hole 330. The output end 420 of the transmission shaft 400 is provided with a third fixing hole 430. The liquid delivery device also includes an adjustment member 520. The adjustment member 520 can pass through the second fixing hole 340 and be adjustably connected and fixed to the third fixing hole 430. The axial dimensions of the connecting disk 300 and the center disk 200 relative to the transmission shaft 400 can be adjusted by adjusting the installation position of the adjustment member 520 relative to the third fixing hole 430. In this embodiment, the adjustment member 520 can be a bolt, and axial adjustment is achieved by adjusting the screwing depth of the bolt in the third fixing hole 430.

[0065] like Figure 1 、 Figure 11 and Figure 12In an embodiment, in order to position and confine the hose in the gap and prevent the hose from escaping from the gap, the liquid medicine delivery device further includes a plurality of guide wheels 900. The guide wheels 900 are used to confine the hose in the gap. Specifically, the guide wheels 900 can be rotatably connected to the center disk 200 or the limiter 120 via a second shaft 920 or a second mounting groove. The second shaft 920 or the second mounting groove is provided on the center disk 200 or the limiter 120 to facilitate the guide wheel 900 to be mounted on the second shaft 920 or the second mounting groove. For example, by mounting the guide wheel 900 on the center disk 200 via the second shaft 920, the guide wheel 900 can be rotated relative to the second shaft 920. When the center disk 200 or the limiting member 120 drives the multiple guide wheels 900 to move in a circular motion to form a blocking surface, the hose can contact and frictionally engage with the guide wheels 900 during the circular motion of the guide wheels 900. Since the guide wheels 900 can rotate, after friction is generated between the guide wheels 900 and the hose, the guide wheels 900 can rotate to change the sliding friction between the guide wheels 900 and the hose into rolling friction between the guide wheels 900 and the hose, thereby eliminating the friction between the guide wheels 900 and the hose to a certain extent, and preventing the guide wheels 900 from applying external force to the hose during the circular motion, thereby reliably and stably confining the hose in the gap. Figure 11 In the embodiment, the guide wheel 900 can be rotatably connected to the center disk 200 via the second shaft 920 or the second mounting groove, and the extrusion wheel 800 can be rotatably connected to the limiting member 120 via the first shaft 840 or the first mounting groove.

[0066] There are multiple guide wheels 900 and extrusion wheels 800; an extrusion wheel 800 is set between two adjacent guide wheels 900, so that the guide wheels 900 and the extrusion wheels 800 are alternately set on the same center disk 200 or the limiter 120, or the guide wheel 900 is set on the center disk 200, the extrusion wheel 800 is set on the limiter 120, and a guide wheel 900 is set on the limiter 120 at the corresponding position between two adjacent extrusion wheels 800. Figure 1As shown, the guide wheel 900 and the extrusion wheel 800 are alternately arranged on the same center disk 200, and the guide wheel 900 limits the hose, while the extrusion wheel 800 performs the extrusion operation on the hose. In addition, the extrusion wheel 800 and the guide wheel 900 are arranged on the side of the center disk 200 close to the connecting disk 300, and multiple extrusion wheels 800 and multiple guide wheels 900 are arranged around the outer edge of the connecting disk 300, and are loosely matched with the outer edge of the connecting disk 300. Therefore, by arranging the extrusion wheel 800, the guide wheel 900 and the connecting disk 300 on the side of the center disk 200 away from the transmission shaft 400, it is more conducive to improving the compactness and structural strength of the overall structure composed of the extrusion wheel 800, the guide wheel 900, the connecting disk 300 and the center disk 200, so that during the rotation of the center disk 200, the extrusion wheel 800 and the guide wheel 900 can follow the stability of the circular motion of the center disk 200. As shown Figure 12 As shown, the guide wheels 900 and the squeezing wheels 800 are alternately arranged on the same stopper 120. The squeezing wheel 800 is arranged between two adjacent guide wheels 900. Placing the squeezing wheel 800 between the two guide wheels 900 can ensure that the hose will not be separated from the gap during the squeezing or loosening of the squeezing wheel 800, thereby preventing the hose from being separated from the working position.

[0067] by Figure 1 Taking the illustrated liquid medicine delivery device as an example, the center disk 200 may be provided with a plurality of second fixing grooves 240, each corresponding to the second shaft 920. The second shaft 920 includes a limiting edge 924, a fourth shaft body 922, a third shaft body 921, and a second locking hole 923. The limiting edge 924 is wider than the fourth shaft body 922, and the outer diameter of the fourth shaft body 922 is larger than the outer diameter of the third shaft body 921, ensuring that the second shaft 920 can fix the guide wheel 900 to the second fixing groove 240 of the center disk 200. The second locking hole 923 on the fourth shaft body 922 is connected to the D-shaped hole on the limiting edge 924, and one end of the guide wheel 900 is limited by the limiting edge 924.

[0068] In order to enhance the restrictive effect of the guide wheel 900 on the hose, the circumferential surface of the guide wheel 900 is inwardly recessed to form an annular guide groove 910. The guide groove 910 is used to partially surround the hose, ensuring that it is fixed on the guide wheel 900 and moves along a predetermined route under the drive of the power component. Multiple guide wheels 900 can also be set at equal distances from the axis of the center disk 200. The distance can be the same as or different from the distance between the extrusion wheel 800 and the axis of the center disk 200. The guide groove 910 can be an arc-shaped groove, the shape of which matches the outer wall of the hose to avoid damage to the hose during the process of restricting the hose. The provision of the guide groove 910 can prevent the hose from axially disengaging from the center disk 200 during the rotation process.

[0069] In one embodiment, a hose installation passage 130 is formed between the extrusion wheel 800 and the stopper 120. The stopper 120 may be an annular member with a notch 121. Because the stopper 120 is an annular member with the notch 121, the installation passage 130 forms an annular channel. The annular channel has an input portion and an output portion, with the notch 121 between the input and output portions. The hose is installed in the installation passage 130 via the stopper 120 and the guide wheel 900, preventing the hose from being disengaged from the installation passage 130. One side of the notch 121 represents the hose's input end, while the other side represents the hose's output end. The size of the notch 121 can be either different or the same from the hose's input end to the hose's output end.

[0070] like Figure 11 and Figure 12 As shown, Figure 11 and Figure 12 In the figure, "A" represents the extrusion wheel 800, and "B" represents the guide wheel 900. In a practical scenario, the liquid medicine delivery device includes a stopper 120, a center disk 200, a power member, and the extrusion wheel 800. A first shaft 840 or a first mounting groove is provided on the stopper 120, and the extrusion wheel 800 is mounted on the stopper 120 via the first shaft 840 or the first mounting groove, thereby forming a gap between the extrusion wheel 800 and the center disk 200 for inserting the hose. The power element is used to drive the stopper 120 to rotate while the center disk 200 remains stationary, allowing the center disk 200 and the stopper 120 to rotate relative to each other. As the center disk 200 and the stopper 120 rotate relative to each other, the rotation of the stopper 120 drives the extrusion wheel 800 on the stopper 120 to squeeze the hose in the gap between the extrusion wheel 800 and the center disk 200, thereby delivering the liquid medicine. Simultaneously, the extrusion wheel 800 rotates due to the friction of the hose during the extrusion process, enabling the extrusion wheel 800 to rotate on its own, thereby reducing the resistance of the extrusion wheel 800 when squeezing the hose. When the center disk 200 is not rotating, the extrusion wheel 800 is mounted on the stopper 120 via a first shaft 840 or a first mounting slot provided on the stopper 120. The stopper 120 is sleeved around the periphery of the center disk 200, forming a gap between the extrusion wheel 800 and the periphery of the center disk 200. The power element drives the stopper 120 to rotate around the center disk 200.

[0071] In a practical scenario, the liquid medicine delivery device includes a stopper 120, a center disk 200, a power element, and an extrusion wheel 800. A first shaft 840 or a first mounting slot is provided on the center disk 200 and the stopper 120. The extrusion wheels 800 are mounted on the center disk 200 and the stopper 120 via the first shaft 840 or the first mounting slot, thereby forming gaps between different extrusion wheels 800 for inserting a hose. The power element can be used to drive at least one of the center disk 200 and the stopper 120 to cause relative rotation between the center disk 200 and the stopper 120, and is not specifically limited herein. During the relative rotation of the center disk 200 and the stopper 120, the extrusion wheel 800 can squeeze the hose in the gap formed between the different extrusion wheels 800, thereby delivering the liquid medicine. Simultaneously, the extrusion wheel 800 rotates due to friction with the hose, enabling the extrusion wheel 800 to rotate on its own, thereby reducing resistance when the extrusion wheel 800 squeezes the hose.

[0072] Through the above-mentioned method, gaps embedded in the hose can be formed in different ways, forming a variety of ways of squeezing the hose to deliver the liquid medicine. At the same time, the squeezing wheel 800 can be driven by the friction of the hose to rotate during the squeezing of the hose, thereby reducing the resistance when the squeezing wheel 800 squeezes the hose. In addition, in the embodiment where the center disk 200 does not rotate but the limiter 120 rotates, in order to drive the limiter 120 to rotate, the power part may include a motor 1000 and a first gear 1001 connected to the motor 1000. The limiter 120 is provided with a tooth pattern 122 matching the first gear 1001 on the side close to the center disk 200, so as to drive the limiter 120 to rotate through the power part. Figures 12 to 14 ,by Figure 12In the embodiment shown in the figure, the center disc 200 does not rotate while the limiting member 120 rotates, and an extrusion wheel 800 is arranged between two adjacent guide wheels 900, and the guide wheels 900 and the extrusion wheels 800 are alternately arranged on the same limiting member 120. When the motor 1000 drives the first gear 1001 to rotate, the first gear 1001 drives the limiting member 120 provided with the toothed groove 122 to rotate due to the matching between the first gear 1001 and the toothed groove 122, thereby achieving the driving of the rotation of the limiting member 120, and the relative rotation of the center disc 200 and the limiting member 120. Therefore, in the process of the relative rotation of the center disc 200 and the limiting member 120, the extrusion wheel 800 can extrude the hose located in the gap, and the extrusion wheel 800 can rotate by relying on the friction of the hose. At the same time, since the limiting member 120 is provided with the guide wheel 900, the guide wheel 900 can limit the hose in the gap during the relative rotation of the center disc 200 and the limiting member 120, so as to ensure that the hose will not be separated from the gap during the extrusion or loosening of the hose by the extrusion wheel 800, thereby avoiding the separation of the hose from the working position. In another embodiment, the limiting member 120 can be an annular member with a notch 121, which facilitates the embedding of the hose conveying the medical liquid in the gap between the extrusion wheel 800 and the center disc 200, and facilitates the taking out of the hose from the medical liquid conveying device. For the center disc 200 and the limiting member 120, the height of the surface on which the extrusion wheel 800 is installed can have a preset height difference, and after the extrusion wheel 800 is installed on the center disc 200 or the limiting member 120, the gap formed between the extrusion wheel 800 and the limiting member 120, between the extrusion wheel 800 and the center disc 200, or between different extrusion wheels 800 can embed the hose. The preset height difference can be customized as needed, and is not limited herein. For example, Figure 12 In the medical liquid conveying device shown in the figure, the upper surface of the center disc 200 can protrude from the upper surface of the limiting member 120, the first shaft 840 is arranged on the upper surface of the limiting member 120, and the extrusion wheel 800 is rotatably arranged on the first shaft 840, so that the extrusion wheel 800 on the upper surface of the limiting member 120 and the center disc 200 form a gap for embedding the hose. In other embodiments, the extrusion wheel 800 is arranged on the limiting member 120, but the extrusion wheel 800 is arranged on the side of the limiting member 120 close to the center disc 200, and in this case, the upper surface of the center disc 200 can be flush with the upper surface of the limiting member 120 or have a preset height difference. In other embodiments, the size of the gap formed between the extrusion wheel 800 and the limiting member 120, between the extrusion wheel 800 and the center disc 200, or between different extrusion wheels 800 can be customized as needed, and is not limited herein.

[0073] The application provides a contrast injection device, which comprises the liquid medicine delivery device of any one of the above embodiments. Since the liquid medicine delivery device can form the gap embedded in the hose in different ways, various ways of delivering liquid medicine by squeezing the hose are formed, and at the same time, the squeezing wheel can rotate by relying on the hose friction during the process of squeezing the hose, so as to reduce the resistance when the squeezing wheel squeezes the hose. Therefore, the contrast injection device comprising the liquid medicine delivery device is more convenient and flexible. The contrast injection device of the embodiment can be applied to the medical field, and liquid can be injected into the body of a patient. The liquid can be different contrast agents and NaCl flushing solutions, so as to perform medical imaging examination. The liquid delivery device can extract each liquid in a liquid bottle through a hose system to inject into the body.

[0074] The above only discloses the preferred embodiments of the application, and of course cannot limit the scope of the application. Therefore, equivalent changes made according to the claims of the application are still within the scope of the application.

Claims

1. A liquid medicine delivery device, characterized in that: include: Limiting parts, center plate, power parts, guide wheels and extrusion wheels; Wherein, the power member is used to drive at least one of the central disk and the limiting member to cause the central disk and the limiting member to rotate relative to each other; The extrusion wheel is mounted on the center disk or the limiting member via a first shaft or a first mounting groove. A gap is formed between the extrusion wheel and the limiting member, between the extrusion wheel and the center disk, or between different extrusion wheels. The gap is used to insert a hose. During the relative rotation of the center disk and the limiting member, the hose located in the gap can be squeezed at least by the extrusion wheel to transport the liquid medicine in the hose. The extrusion wheel is driven by the friction of the hose to achieve rotation during the process of extruding the hose; The guide wheel is rotatably connected to the center disk or the limit member via a second shaft or a second mounting groove, and the second shaft or the second mounting groove is provided on the center disk or the limit member; the guide wheel is used to confine the hose in the gap; The upper limit of the rotation speed of the central disk is 300 rpm, or the rotation speed of the central disk meets the condition: the flow rate of the liquid medicine in the hose is between 1 ml / s and 30 ml / s.

2. The drug delivery device according to claim 1, wherein: The liquid medicine delivery device includes a plurality of first bearings, and the number of the extrusion wheels and the first shafts are both several. The extrusion wheels are arranged in a one-to-one correspondence with the first bearings and the first shafts. The plurality of first shafts are distributed at intervals around the axis of the center disk. The first shaft is connected to the center disk, and the plurality of extrusion wheels are assembled one by one on the plurality of first shafts through the plurality of first bearings.

3. The drug delivery device according to claim 2, wherein: An assembly space for accommodating the first bearing is provided in the extrusion wheel. The first bearing is arranged in the assembly space, and the outer ring of the first bearing is fixed to the inner wall corresponding to the assembly space of the extrusion wheel, and the inner ring of the first bearing is sleeved on the outer peripheral wall of the first shaft. A first limiting portion and a second limiting portion are respectively provided at two axial ends of the assembly space of the extrusion wheel, and the first limiting portion and the second limiting portion are used to limit the first bearing from axially separating from the extrusion wheel.

4. The drug delivery device according to claim 3, characterized in that: The first limiting portion is a limiting edge extending radially from the inner wall of the extrusion wheel toward the axis thereof, the limiting edge having a first through hole, the maximum diameter of the first through hole being smaller than the outer diameter of the first bearing, so that the limiting edge abuts against one end of the first bearing; The second limiting portion is a ring plate with a notch, and the inner diameter of the ring plate is smaller than the outer diameter of the first bearing, so that the ring plate supports the other end of the first bearing; An annular groove is provided on the inner wall of the extrusion wheel at a position corresponding to the annular sheet. The width of the annular groove matches the thickness of the annular sheet. The outer diameter of the annular groove is larger than the outer diameter of the first bearing. The edge of the annular sheet is inserted into the annular groove to be fixed on the extrusion wheel.

5. The drug delivery device according to claim 2, wherein: The center disk is provided with a plurality of first fixing grooves, and the first fixing grooves are arranged in a one-to-one correspondence with the first shafts; The first shaft includes a first shaft body and a second shaft body coaxially connected, the first shaft body is accommodated in the first fixing groove, the second shaft body protrudes from the center disk, and the outer diameter of the second shaft body is smaller than the outer diameter of the first shaft body, the first bearing is sleeved on the second shaft body so that the extrusion wheel can be installed on the center disk, and one end of the first bearing is limited by the first shaft body close to the second shaft body.

6. The drug delivery device according to claim 5, characterized in that: The first shaft is further provided with a first locking hole; The drug delivery device also includes a first connecting member, which includes a first locking shaft and a first limiting end coaxially connected, the first locking shaft is accommodated in the first locking hole and fixed to the end of the first shaft facing the extrusion wheel, the first limiting end protrudes from the first bearing, and the outer diameter of the first limiting end is larger than the outer diameter of the first locking shaft and larger than the inner diameter of the first bearing, so that the other end of the first bearing is limited by the first limiting end close to the side of the first locking shaft.

7. The drug delivery device according to claim 6, characterized in that: A second through hole is provided on the center disk at a position corresponding to the first locking hole. The second through hole is connected to the first fixing slot, and the diameter of the second through hole is smaller than the diameters of the first fixing slot and the first shaft body, so as to form a step between the second through hole and the first fixing slot. The step performs a first axial limit on the first shaft body. The drug delivery device also includes a second connecting member, which includes a second locking shaft and a second limiting end. The second locking shaft is accommodated in the second through hole and the first locking hole, and is fixed to the end of the first shaft away from the extrusion wheel. The second limiting end protrudes from the second through hole. The outer diameter of the second limiting end is larger than the outer diameter of the second locking end and larger than the outer diameter of the second through hole, so as to perform a second axial limit on the first shaft body, and the second axial direction is opposite to the first axial direction.

8. The drug delivery device according to claim 2, wherein: The limiting member does not rotate; The liquid medicine delivery device further includes a transmission shaft, the input end of the transmission shaft is in transmission connection with the power member, the output end of the transmission shaft is connected to the center disk, and the gap is formed between the extrusion wheel and the side of the limit member facing the center disk; The power member drives the center disk to rotate via the transmission shaft. The rotation of the center disk can drive the multiple extrusion wheels to cooperate with the limiting member to alternately squeeze and release the hose.

9. The drug delivery device according to claim 8, characterized in that: The limiting member is an annular member with a gap, one side of the gap is the input end of the hose, and the other side is the output end of the hose, and the size of the gap varies from the input end to the output end of the hose.

10. The drug delivery device according to claim 9, wherein: The plurality of extrusion wheels are arranged at equal distances from the axis of the central disk.

11. The drug delivery device according to claim 10, wherein: The axis of the center disk is provided with a through hole, and the drug delivery device also includes a connecting disk, which has a plurality of connecting parts. The plurality of connecting parts are spaced apart around the axis of the connecting disk, and the axial distance from the connecting part to the connecting disk is greater than the radius of the through hole. The connecting disk is located on one side of the center disk, and the output end of the transmission shaft enters the through hole from the other side of the center disk, passes through the center disk and is fixedly connected to the connecting disk. The connecting disk is fixedly connected to the center disk through the connecting part.

12. The drug delivery device according to claim 1, wherein: The center disk does not rotate; the extrusion wheel is mounted on the limiter through a first shaft or a first mounting groove provided on the limiter, and the limiter is sleeved on the periphery of the center disk to form the gap between the extrusion wheel and the periphery of the center disk; The power member drives the limiting member to rotate around the central disk.

13. The drug delivery device according to claim 12, wherein: The upper surface of the center disk protrudes from the upper surface of the limiting member, the first shaft is provided on the upper surface of the limiting member, and the extrusion wheel is rotatably provided on the first shaft; The power member includes a motor and a first gear connected to the motor. The limiting member is provided with teeth matching the first gear on a side close to the center disk, so that the limiting member is driven to rotate by the power member.

14. The drug delivery device according to claim 13, wherein: The number of the guide wheels and the extrusion wheels is multiple; A squeeze wheel is arranged between two adjacent guide wheels, so that the guide wheels and the squeeze wheels are alternately arranged on the same center disk or the limiting member, or, The guide wheel is arranged on the central disk, the extrusion wheel is arranged on the limiting member, and one guide wheel is arranged on the limiting member at a corresponding position between two adjacent extrusion wheels.

15. The drug delivery device according to claim 1, wherein: The maximum pressure of the liquid medicine in the hose is 300 psi, and / or the flow accuracy of the liquid medicine has an error of less than 5%.

16. A radiographic injector, characterized in that: A drug liquid delivery device comprising the device described in any one of claims 1-15.

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