Device for injection of drug for treating heart failure

Abstract

Disclosed is a device for injection of a drug for treating heart failure, comprising a delivery catheter (1) and an abutting piece (2) arranged at one end of the delivery catheter (1). A plurality of guide holes (3) are formed in the abutting piece (2). A storage pipe (4) is slidably connected into the delivery catheter (1). One end of the storage pipe (4) proximal to the abutting piece (2) is provided with a plurality of injection needles (5) in communication with the storage pipe (4). The plurality of injection needles (5) are slidably inserted into the plurality of guide holes (3) in a one-to-one correspondence manner. A sealing plate (6) is rotatably connected into an inner wall of one end of the storage pipe (4) proximal to the injection needles (5). By means of the arrangement of the storage pipe (4), during injection, the length of a movable pipe (11) protruding from an injection pipe (10) can be adjusted so as to control the distance between an injection piston (13) and the sealing plate (6), and the spatial volume between the injection piston (13) and the sealing plate (6) is the total amount of the drug to be injected for a single time, thereby accurately controlling the injection amount of the drug for a single time.

Description

A device for injecting heart failure treatment drugs Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a drug injection device for treating heart failure. Background Art

[0002] Heart failure is the full name of heart failure, which refers to the inability of the heart's contractile or diastolic function to fully discharge the venous blood from the body, resulting in blood congestion in the venous system and insufficient blood supply to the arterial system, which ultimately causes heart circulatory system disorders.

[0003] Existing heart failure treatment options include drug therapy, assistive devices, and heart transplantation, but different treatment methods face great challenges. For example, drug therapy generally causes recurrent symptoms in many patients. Biventricular pacing treatment is not suitable for all patients. Some patients' physical fitness does not even meet the treatment conditions, leading to abnormal reactions in the body. In addition, when treating with heart transplantation, the source of heart donors is very limited.

[0004] In order to change the problems of large trauma of open chest surgery, low injection efficiency and poor injection treatment effect in existing clinical surgical processes, China Patent Publication No. CN113577504A discloses a heart failure treatment system, "including a control mechanism, a delivery catheter connected to the control mechanism, and an injection module arranged in the delivery catheter; wherein the distal part of the injection module has a preset shape; and a guide positioning device, and the guide positioning device is at least partially arranged in the delivery catheter."

[0005] During use of the above patent, since the injection module has a certain length and lacks a suitable quantitative component in the injection module, the quantitative injection can only rely on the doctor's personal operating experience and judgment, which has certain errors; secondly, after the above injection module performs an injection, part of the medicine will remain in the injection module, and the residual medicine will affect the next injection volume of the medicine, which will cause the above injection module to be able to perform only a single injection operation. Therefore, it is necessary to propose a heart failure treatment drug injection device to solve the above problems.

[0006] Summary of the Invention

[0007] The purpose of the present invention is to provide a drug injection device for treating heart failure, which has the advantages that: the present invention is provided with a storage tube, and when injecting, the length of the movable tube extending out of the injection tube can be adjusted, thereby controlling the distance between the injection piston and the sealing plate, and the spatial volume between the injection piston and the sealing plate is the total amount of the drug to be injected in a single time, thereby achieving accurate control of the single drug injection amount in this way.

[0008] The above technical objectives of the present invention are achieved through the following technical solutions: a heart failure treatment drug injection device, comprising a delivery catheter and an abutment member arranged at one end of the delivery catheter, the abutment member being provided with a plurality of guide holes, the delivery catheter being slidably connected with a storage tube, the storage tube being provided with a plurality of injection needles connected to the storage tube at one end close to the abutment member, the plurality of injection needles being slidably plugged into the plurality of guide holes in a one-to-one correspondence, the inner wall of the storage tube being rotatably connected with a sealing plate at one end close to the injection needle, and the sealing plate being penetrated by a plurality of connection holes corresponding to the plurality of injection needles, the storage tube being provided with an opening at one end away from the sealing plate, the storage tube being rotatably connected with a tube plug at the opening, the inner wall of the delivery catheter being fixedly connected with a limiting ring connected to the tube plug near the tube plug, the tube plug being provided with an injection assembly, and a connecting assembly being provided between the injection assembly and the sealing plate;

[0009] The injection assembly includes an injection tube that slides through the tube plug, and the outer side of the injection tube facing the storage tube is threadedly connected to a movable tube, and the outer side of the movable tube is connected to a positioning ring near the storage tube, and the end of the movable tube is fixedly connected to an injection piston, and a liquid inlet hole connected to the injection tube is provided at the center of the injection piston, and a plurality of blocks are fixedly connected to the inner wall of the storage tube near the sealing plate, and a plurality of slots that cooperate with the blocks are circumferentially provided on the side of the injection piston facing the sealing plate. The end of the injection tube away from the injection piston is detachably connected to the drug delivery tube, and a first check valve is installed on the drug delivery tube. A balancing tube that sequentially passes through the tube plug and the injection piston is provided above the injection tube, and the end of the balancing tube away from the injection piston is connected to a connecting tube, and a second check valve is fixedly connected to the outer side of the connecting tube, and the opening of the connecting tube is adapted to the syringe.

[0010] The present invention is further configured as follows: the connecting assembly includes a connecting strip fixedly connected to the center of the side of the sealing plate away from the injection needle, the length of the connecting strip is greater than the length of the storage tube, the end of the connecting strip away from the sealing plate passes through the liquid inlet hole to the movable tube for sliding connection, and limiting grooves are provided on the top and bottom sides of the movable tube and the liquid inlet tube, and the two ends of the limiting groove are respectively connected to the injection piston and the end away from the movable tube.

[0011] The present invention is further configured as follows: a sealing ring is fixedly connected to the inner side of the storage tube, and the sealing ring is rotatably sleeved on the outer side of the sealing plate, and the side of the sealing ring opposite to the injection piston is flush with the sealing plate.

[0012] The present invention is further configured such that: the ends of the plurality of guide holes away from the storage tube all spread in a direction away from the center of the abutment member.

[0013] The present invention is further configured such that: the connecting strip is provided with a plurality of through holes at equal intervals along the length direction, and the thickness of the connecting strip is smaller than the diameter of the liquid inlet hole.

[0014] The present invention is further configured as follows: a plurality of support blocks are rotatably connected at equal intervals on the inner wall of the delivery conduit on the side of the limiting ring away from the storage tube, and the support blocks are provided with sockets for the injection tube and the balance tube to slide through.

[0015] The present invention is further configured as follows: an extrusion plate is sleeved on the outer side of one end of the drug delivery tube close to the injection tube, and the diameter of the extrusion plate is larger than the diameter of the injection tube.

[0016] The present invention is further configured such that: the diameter of the abutment member is the same as the outer diameter of the delivery tube, and the edge of the abutment member away from one end of the delivery tube is rounded.

[0017] The present invention is further configured such that the friction between the injection piston and the inner wall of the storage tube is smaller than the friction between the outer wall of the storage tube and the inner wall of the delivery conduit.

[0018] The technical effects and advantages of the present invention are as follows:

[0019] 1. The present invention is provided with a storage tube. When performing an injection, the length of the movable tube extending from the injection tube can be adjusted to control the distance between the injection piston and the sealing plate. The volume of the space between the injection piston and the sealing plate is the total amount of medicine to be injected in a single injection, thereby achieving accurate control of the single injection amount of medicine;

[0020] 2. The present invention is provided with a balance tube and a storage tube. Since the medicine injected each time can be temporarily stored in the storage tube, when multiple injections are required, the amount of the medicine can be accurately controlled, so that preparations can be made for the next injection without taking out the injection tube, thereby achieving the purpose of multiple injections. In addition, when other medicines need to be injected for complementary treatment, gas can be injected into the balance tube to discharge the medicine remaining in the injection tube from the previous injection from the dosing tube, thereby avoiding excessive injection of the previous medicine and improving the injection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG1 is a schematic diagram of the overall structure of the present invention;

[0022] FIG2 is a cross-sectional view of the overall structure of the present invention;

[0023] FIG3 is an enlarged view of portion A of FIG2 of the present invention;

[0024] FIG4 is a perspective cross-sectional view of a storage tube according to the present invention;

[0025] FIG5 is an enlarged view of portion B of FIG4 of the present invention;

[0026] FIG6 is a perspective schematic diagram of the structures of the injection assembly, sealing plate, connecting strip, and extrusion plate of the present invention;

[0027] FIG7 is a perspective schematic diagram of the injection piston and the movable tube in the present invention.

[0028] Figure numerals: 1. delivery catheter; 2. abutment; 3. guide hole; 4. storage tube; 5. injection needle; 6. sealing plate; 7. connecting hole; 8. tube plug; 9. limiting ring; 10. injection tube; 11. movable tube; 12. positioning ring; 13. injection piston; 14. liquid inlet hole; 15. clamping block; 16. clamping groove; 17. dosing tube; 18. first check valve; 19. balancing tube; 20. connecting tube; 21. second check valve; 22. connecting strip; 23. limiting groove; 24. sealing ring; 25. through hole; 26. support block; 27. extrusion plate. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below with reference to the accompanying drawings.

[0030] Embodiment: Referring to Figures 1-7, a heart failure treatment drug injection device includes a delivery catheter 1, one end of the delivery catheter 1 is connected to a stopper 2, and a plurality of guide holes 3 are formed on the stopper 2. The diameter of the stopper 2 is the same as the outer diameter of the delivery catheter 1, and the edge of the stopper 2 away from the end of the delivery catheter 1 is rounded. A storage tube 4 is slidably installed in the delivery catheter 1, and a plurality of injection needles 5 are connected to the end of the storage tube 4 near the stopper 2. The injection needles 5 are connected to the interior of the storage tube 4, and the plurality of injection needles 5 are slidably plugged in one by one. In the multiple guide holes 3, a sealing plate 6 is rotatably mounted on the inner wall of the storage tube 4 near the end of the injection needle 5. The sealing plate 6 is penetrated by multiple connecting holes 7, and the multiple connecting holes 7 correspond one-to-one to the positions of the multiple injection needles 5. The other end of the storage tube 4 is open, and a pipe plug 8 is rotatably connected to the open end of the storage tube 4. The pipe plug 8 is slidably plugged with an injection assembly. A connecting assembly is provided between the injection assembly and the sealing plate 6. A limit ring 9 is provided on the side of the pipe plug 8 away from the injection needle 5. The limit ring 9 is fixedly connected to the inner wall of the delivery catheter 1.

[0031] The injection assembly includes an injection tube 10, which is slidably inserted into the tube plug 8. The end of the injection tube 10 located in the storage tube 4 is threadedly inserted with a movable tube 11. The movable tube 11 is fixedly connected to a positioning ring 12 at the edge of the outer end of the injection tube 10. The end of the movable tube 11 away from the injection tube 10 is connected to an injection piston 13, and the friction between the injection piston 13 and the inner wall of the storage tube 4 is less than the friction between the outer wall of the storage tube 4 and the inner wall of the delivery conduit 1. A liquid inlet hole 14 is opened at the center of the injection piston 13, and the liquid inlet hole 14 is connected to the injection tube 10. A plurality of blocks 15 are fixedly connected to the inner wall of the storage tube 4. The block 15 is close to the side of the sealing plate 6 close to the injection piston 13, and the plurality of blocks 15 are evenly distributed in an annular manner on the storage tube 4. On the inner wall, a card groove 16 is provided at the edge position of the injection piston 13 on the opposite side of the multiple blocks 15. The length of the card groove 16 is greater than the thickness of the block 15, and the depth of the card groove 16 is greater than the height of the block 15. The end of the injection tube 10 away from the injection piston 13 is detachably connected to a drug delivery tube 17, and a first check valve 18 is provided on the drug delivery tube 17. A balancing tube 19 is provided on the top of the injection tube 10, and the balancing tube 19 is sequentially inserted into the pipe plug 8 and the injection piston 13. The balancing tube 19 and the injection piston 13 are detachably connected together. The end of the balancing tube 19 away from the injection piston 13 is detachably connected to a connecting tube 20, and a second check valve 21 is provided on the connecting tube 20, and the diameter of the connecting tube 20 matches the port diameter of the existing syringe.

[0032] The connecting assembly includes a connecting bar 22, which is vertically fixedly connected to the center of the side of the sealing plate 6 away from the injection needle 5. The connecting bar 22 is longer than the storage tube 4. The end of the connecting bar 22 away from the sealing plate 6 is slidably inserted into the movable tube 11 through the liquid inlet hole 14 of the injection piston 13. The movable tube 11 and the liquid inlet hole 14 are each provided with a mutually connected limiting groove 23 on the top and bottom inner walls. The ends of the limiting groove 23 are respectively connected to the injection piston 13 and the end of the movable tube 11 away from the injection piston 13.

[0033] Before injection, adjust the injection assembly first. The specific adjustment steps are as follows:

[0034] Step 1: Push the injection tube 10 so that it drives the injection piston 13 to fit together with the sealing plate 6;

[0035] Step 2: Twist the injection tube 10 and the balancing tube 19 to cause the injection piston 13 to rotate under the drive of the injection tube 10 and the balancing tube 19. When the multiple grooves 16 on the injection piston 13 are respectively aligned with the multiple blocks 15 on the inner wall of the storage tube 4, the injection piston 13 is pushed again by the injection tube 10 and the balancing tube 19, so that the grooves 16 on the injection piston 13 are engaged with the corresponding blocks 15.

[0036] Step three: Twist the injection tube 10. At this time, since the injection piston 13 is restricted by the block 15 on the inner wall of the storage tube 4, as the injection tube 10 rotates, the movable tube 11 can gradually extend from the injection tube 10, and the injection tube 10 can move in the direction away from the injection piston 13. As the distance that the movable tube 11 extends from the injection tube 10 increases, when the injection tube 10 is pulled so that the positioning ring 12 at its end contacts the tube plug 8, the volume of the space between the injection piston 13 and the sealing plate 6 is the total amount of medicine to be injected in a single time, thereby achieving accurate control of the single medicine injection amount in this way.

[0037] Step 4: After the movable tube 11 is adjusted, pull the injection tube 10 to drive the injection piston 13 to separate from the block 15. Then continue to twist the injection tube 10 and the balancing tube 19. Since the injection piston 13 is no longer restricted by the block 15, as the injection tube 10 and the balancing tube 19 are twisted, the injection piston 13 drives the connecting strip 22 and the sealing plate 6 to rotate together through the limiting groove 23, so that the multiple connecting holes 7 on the sealing plate 6 are connected to the multiple injection needles 5. At this point, the injection assembly is adjusted;

[0038] During the injection operation, two sheath tubes that have been adjusted in bending (where the sheath tubes are commonly used guiding and positioning devices in existing interventional treatments) are first passed through the femoral artery and the aortic arch, and then the first layer of the sheath tube is bent to pass through the aortic valve position, and then reach the left ventricle. Finally, the distal end of the second sheath tube is passed through the myocardial tissue vertically. Then, the delivery catheter 1 is inserted into the second sheath tube, and the abutment member 2 at the end of the delivery catheter 1 is perpendicularly abutted against the myocardial tissue under the guidance of the second sheath tube.

[0039] Then the injection judgment is carried out, and the steps of injection judgment are as follows:

[0040] Step 1: Open the second check valve 21 while closing the first check valve 18, then push the injection tube 10 and the balancing tube 19, causing them to move the injection piston 13 toward the sealing plate 6. During this process, as the injection piston 13 moves along the storage tube 4, the air in the storage tube 4 can be discharged through the balancing tube 19. When the injection piston 13 contacts the sealing plate 6, it continues to push the injection tube 10 and the balancing tube 19, so that the storage tube 4, under the push of the injection tube 10 and the balancing tube 19, drives the injection needle 5 toward the myocardial tissue.

[0041] Step 2: As the storage tube 4 continues to move, the injection needle 5 gradually extends out of the guide hole 3. When the storage tube 4 contacts the abutment member 2, the injection tube 10 and the balancing tube 19 stop pushing.

[0042] Step 3: Then connect the existing syringe to the connecting tube 20 and perform a pumping action. If the syringe can be reset, it proves that the injection needle 5 has been inserted into the myocardial tissue, and the subsequent injection operation can be performed at this time. If the syringe cannot be reset, it means that the injection needle 5 has not been inserted into the myocardial tissue, and the position of the abutment member 2 needs to be readjusted to facilitate re-injection.

[0043] When it is determined that the injection can be performed, the injection tube 10 is first pulled to drive the positioning ring 12 to contact the tube plug 8, while the injection needle 5 is still stuck in the myocardial tissue. Then the injection tube 10 is twisted to drive the sealing plate 6 to rotate through the connecting strip 22, thereby sealing the injection needle 5. Then, the first check valve 18 is opened, and the medicine is injected into the injection tube 10 through the drug delivery tube 17. At this time, since the injection needle 5 is blocked, the medicine entering the injection tube 10 can enter the storage tube 4 through the liquid inlet hole 14. As the medicine in the storage tube 4 gradually increases, the air in the storage tube 4 can be discharged through the balance tube 19. When the storage tube 4 is filled with After the storage tube 4 is filled with medicine, a certain amount of medicine is continuously injected into the storage tube 4, and the excess medicine can enter the balance tube 19. The purpose of this operation is to completely expel the air in the storage tube 4 to prevent air from being injected into the myocardial tissue. When the medicine in the storage tube 4 is completely filled, the first check valve 18 and the second check valve 21 are closed first, and then the injection tube 10 is twisted to drive the sealing plate 6 to rotate through the connecting tube 20, so that the connecting hole 7 on the sealing plate 6 is connected to the injection needle 5. Then, the injection tube 10 is pushed. At this time, the injection piston 13, pushed by the injection tube 10, injects all the medicine in the storage tube 4 into the myocardial tissue, thereby realizing the quantitative injection operation;

[0044] When a second injection is required, the medicine can be added to the storage tube 4 in the same manner as described above. After the medicine is added, the injection tube 10 can be pushed to perform a second injection, and the amount of medicine injected each time is the same. At the same time, multiple injections can also be achieved through the above operation method.

[0045] In addition, when other drugs need to be injected for complementary treatment, in order to avoid the previous drug remaining in the injection tube 10, the first check valve 18 and the second check valve 21 can be opened at the same time while the sealing plate 6 remains closed, and then gas is injected into the connecting tube 20. As the gas is injected, the gas can enter the injection tube 10 through the storage tube 4, thereby discharging the drug remaining from the previous injection from the dosing tube 17, avoiding excessive injection of the previous drug, and also improving the injection efficiency without the need for re-injection.

[0046] As shown in FIG5 , a sealing ring 24 is rotatably sleeved on the outer side of the sealing plate 6 . The sealing ring 24 is fixedly connected to the inner wall of the storage tube 4 , and the side of the sealing ring 24 close to the injection piston 13 is flush with the sealing plate 6 .

[0047] By providing the sealing ring 24, the sealing ring 24 can improve the sealing between the side surface of the sealing plate 6 and the inner wall of the storage tube 4, thereby preventing the medicine from prematurely flowing out of the storage tube 4 through the gap between the sealing plate 6 and the inner wall of the storage tube 4 when injecting the medicine into the storage tube 4. At the same time, it also ensures the accuracy of the syringe in detecting whether the injection needle 5 has penetrated the myocardial tissue.

[0048] As shown in FIG1 to FIG4 , the length of the guide hole 3 is less than the length of the injection needle 5 , and the ends of the guide holes 3 away from the storage tube 4 are all spread in a direction away from the center of the abutment member 2 ;

[0049] When multiple injection needles 5 are inserted into the myocardial tissue under the guidance of the guide hole 3, the multiple injection needles 5 can perform injection operations in a diffuse manner with the center of the abutment 2 as the point, thereby increasing the injection area of ​​the multiple injection needles 5 and improving the effect and efficiency of the drug.

[0050] As shown in FIG4 to FIG7, the thickness of the connecting strip 22 is smaller than the diameter of the liquid inlet hole 14, and the connecting strip 22 is uniformly penetrated along the front-to-back direction to form a plurality of through holes 25;

[0051] By providing a through hole 25 on the connecting strip 22, when the medicine enters the movable tube 11 and the liquid inlet hole 14 through the injection tube 10, the through hole 25 on the connecting strip 22 can increase the speed of the medicine entering the storage tube 4 through the liquid inlet hole 14 on the premise that the connecting strip 22 is inserted into the liquid inlet hole 14, thereby ensuring the injection efficiency.

[0052] As shown in FIG2 , a plurality of support blocks 26 are evenly distributed within the delivery conduit 1. The plurality of support blocks 26 are all located on the side of the limiting ring 9 away from the storage tube 4. The support blocks 26 are rotatably mounted on the inner wall of the delivery conduit 1. The support blocks 26 have insertion holes formed along both sides thereof, and the injection tube 10 and the balance tube 19 are sequentially slidably inserted into the insertion holes of the plurality of support blocks 26.

[0053] By arranging support blocks 26 in the delivery catheter 1, multiple support blocks 26 can support and limit the parts of the injection tube 10 and the balance tube 19 located in the delivery catheter 1, so that when the injection piston 13 is driven to rotate by twisting the injection tube 10 and the balance tube 19, the support blocks 26 can rotate together with the injection tube 10 and the balance tube 19 with the center of the injection piston 13 as the axis, so that the injection tube 10 and the balance tube 19 can always be parallel to each other under the restriction of the support blocks 26, avoiding entanglement between the two. In addition, when the injection piston 13 is pushed by the injection tube 10, the evenly arranged support blocks 26 can support the outer wall of the injection tube 10, avoiding bending of the injection tube 10 during the process of pushing the injection piston 13.

[0054] As shown in FIG1 and FIG2, the end of the dosing tube 17 close to the injection tube 10 is fixedly sleeved with an extrusion plate 27, and the diameter of the extrusion plate 27 is larger than the diameter of the injection tube 10;

[0055] By providing the squeezing plate 27 , when the injection piston 13 is pushed by the syringe 10 to perform an injection operation, the squeezing plate 27 can increase the contact area between the medical staff's hand and the medication tube 17 , thereby improving the convenience of the injection operation.

[0056] This specific embodiment is merely an explanation of the present invention and is not intended to limit the present invention. After reading this specification, those skilled in the art may make non-creative modifications to this embodiment as needed. However, as long as such modifications are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A heart failure treatment drug injection device, characterized by: The invention comprises a delivery tube (1) and a support member (2) arranged at one end of the delivery tube (1), wherein the support member (2) is provided with a plurality of guide holes (3), a storage tube (4) is slidably connected in the delivery tube (1), and a plurality of injection needles (5) connected to the storage tube (4) are provided at one end of the storage tube (4) close to the support member (2), and the plurality of injection needles (5) are respectively and one by one slidably plugged into the plurality of guide holes (3), and the inner wall of the storage tube (4) close to the injection needles (5) is provided. A sealing plate (6) is rotatably connected, and a plurality of connection holes (7) corresponding to a plurality of injection needles (5) are formed on the sealing plate (6). An opening is formed at one end of the storage tube (4) away from the sealing plate (6). A pipe plug (8) is rotatably connected to the storage tube (4) at the opening. A limiting ring (9) connected to the pipe plug (8) is fixedly connected to the inner wall of the delivery conduit (1) near the pipe plug (8). An injection assembly is provided on the pipe plug (8), and a connection assembly is provided between the injection assembly and the sealing plate (6). The injection assembly comprises an injection tube (10) which slides through the tube plug (8), a movable tube (11) is threadedly connected to the outer side of one end of the injection tube (10) facing the storage tube (4), a positioning ring (12) is connected to the outer side of the movable tube (11) near the storage tube (4), an injection piston (13) is fixedly connected to the end of the movable tube (11), a liquid inlet (14) which is connected to the injection tube (10) is provided at the center of the injection piston (13), a plurality of blocks (15) are fixedly connected to the inner wall of the storage tube (4) near the sealing plate (6), and the injection piston (13) faces the sealing plate ( 6), a plurality of card slots (16) are provided on one side of the syringe (10) in a circumferential direction and matched with the card block (15); the end of the syringe (10) away from the injection piston (13) is detachably connected to the drug delivery tube (17); the drug delivery tube (17) is provided with a first check valve (18); a balance tube (19) is provided above the syringe (10) and passes through the tube plug (8) and the injection piston (13) in sequence; the end of the balance tube (19) away from the injection piston (13) is connected to a connecting tube (20); the outer side of the connecting tube (20) is fixedly connected to a second check valve (21), and the opening of the connecting tube (20) is adapted to the syringe.

2. The heart failure treatment drug injection device according to claim 1, characterized in that: The connecting assembly comprises a connecting strip (22) fixedly connected to the center of the side of the sealing plate (6) away from the injection needle (5), the length of the connecting strip (22) is greater than the length of the storage tube (4), and the end of the connecting strip (22) away from the sealing plate (6) passes through the liquid inlet hole (14) to be slidably connected to the movable tube (11), and the movable tube (11) and the liquid inlet tube are provided with limiting grooves (23) on the top and bottom sides thereof, and the two ends of the limiting groove (23) are respectively connected to the injection piston (13) and the end of the movable tube (11) away from the injection piston.

3. The heart failure treatment drug injection device according to claim 1, characterized in that: A sealing ring (24) is fixedly connected to the inner side of the storage tube (4), and the sealing ring (24) is rotatably sleeved on the outer side of the sealing plate (6). The side of the sealing ring (24) facing the injection piston (13) is flush with the sealing plate (6).

4. The heart failure treatment drug injection device according to claim 1, characterized in that: The ends of the plurality of guide holes (3) away from the storage tube (4) all spread in a direction away from the center of the abutment member (2).

5. The heart failure treatment drug injection device according to claim 2, characterized in that: The connecting strip (22) is provided with a plurality of through holes (25) at equal intervals along the length direction, and the thickness of the connecting strip (22) is smaller than the diameter of the liquid inlet hole (14).

6. The heart failure treatment drug injection device according to claim 1, characterized in that: A plurality of support blocks (26) are rotatably connected at equal intervals on the inner wall of the delivery conduit (1) on the side of the limiting ring (9) away from the storage tube (4), and the support blocks (26) are provided with insertion holes for the injection tube (10) and the balance tube (19) to slide through.

7. The heart failure treatment drug injection device according to claim 1, characterized in that: An extrusion plate (27) is sleeved on the outer side of one end of the drug delivery tube (17) close to the injection tube (10), and the diameter of the extrusion plate (27) is larger than the diameter of the injection tube (10).

8. The heart failure treatment drug injection device according to claim 1, characterized in that: The diameter of the abutting member (2) is the same as the outer diameter of the delivery conduit (1), and the edge of the abutting member (2) away from one end of the delivery conduit (1) is arranged in a rounded shape.

9. The heart failure treatment drug injection device according to claim 1, characterized in that: The friction force between the injection piston (13) and the inner wall of the storage tube (4) is smaller than the friction force between the outer wall of the storage tube (4) and the inner wall of the delivery conduit (1).

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