Injector for heart failure medication

Abstract

The present invention discloses an injection device for a heart failure drug, the technical features of which are as follows: It includes a delivery catheter and a contact member provided at one end of the delivery catheter, the contact member having several guide holes, a storage tube sliding in contact with the delivery catheter, several injection needles communicating with the storage tube opening at one end of the storage tube near the contact member, the several injection needles sliding and inserted into the multiple guide holes in a one-to-one correspondence, and a seal plate rotatably connected to the inner wall of the end of the storage tube near the injection needles. The technical effects are as follows: By providing a storage tube, the present invention allows adjustment of the protrusion length of the movable tube from the injection tube during injection, controls the distance between the injection piston and the seal plate, the volume of the space between the injection piston and the seal plate is the total amount of drug injected in one dose, and this method achieves highly accurate control of the amount of drug injected per dose.

Description

[Technical Field]

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

[0002] Heart failure (full name: cardiac dysfunction) is a condition in which impairment occurs in the systolic function or diastolic function of the heart, such that the heart cannot sufficiently drain blood returning from veins into the heart out of the body. This causes blood stasis in veins and insufficient blood supply in arteries, and ultimately leads to cardiac circulatory disorders.

[0003] Conventional heart failure treatment regimens include drug therapy, auxiliary device therapy and heart transplantation, but each of these treatment methods faces significant drawbacks. For example, in drug therapy, symptom recurrence generally occurs frequently in many patients; biventricular pacing therapy is not suitable for all patients, and abnormal reactions may even occur in patients whose general physical condition does not meet the treatment requirements. In addition, for heart transplantation therapy, the number of heart donors is very limited.

[0004] To solve the problems of large trauma from thoracotomy, low injection efficiency and poor therapeutic injection effect in conventional clinical surgical procedures, the Chinese patent with publication number CN113577504A discloses a heart failure treatment system. It discloses the content: "comprising an operating mechanism, a delivery catheter connected to the operating mechanism, an injection module arranged in the delivery catheter and having a preset shape at the distal end, and a guiding and positioning device at least partially arranged in the delivery catheter".

[0005] In the process of implementing the above patent, while the injection module has a predetermined length, it lacks a suitable quantitative assembly within the injection module. Therefore, quantitative injection must be determined based on the physician's individual operational experience, resulting in a certain degree of error. Furthermore, after one injection, some of the drug remains in the injection module, and this remaining drug affects the amount of drug injected in the next injection. Thus, the above injection module can only perform one injection operation. Therefore, there is a need to provide an injection device for heart failure drugs that solves the above problems. [Overview of the project] [Problems that the invention aims to solve]

[0006] The present invention aims to provide an injection device for heart failure treatment drugs that has the advantage of enabling highly accurate control of the amount of drug injected per injection by providing a storage tube, thereby allowing adjustment of the length of the movable tube protruding from the injection tube during injection, controlling the distance between the injection piston and the seal plate, and having the volume of the space between the injection piston and the seal plate as the total amount of drug injected in one dose. [Means for solving the problem]

[0007] The above technical objectives of the present invention are realized by the following technical solution. An injection device for a heart failure drug, comprising a delivery catheter and a contact member provided at one end of the delivery catheter, wherein several guide holes are made in the contact member, a storage tube is slidably made in contact with the delivery catheter, several injection needles communicating with the storage tube are made at one end of the storage tube near the contact member, several injection needles corresponding one-to-one are slidably inserted into a plurality of guide holes, a seal plate is rotatably connected to the inner wall of one end of the storage tube near the injection needles, and several connection holes corresponding one-to-one to the plurality of injection needles are made through the seal plate, an opening is made at one end of the storage tube away from the seal plate, a tubular plug is rotatably connected to the location of the opening of the storage tube, a position regulating ring connected to the tubular plug is fixedly connected to the inner wall of the delivery catheter near the tubular plug, an injection assembly is provided on the tubular plug, and a connection assembly is provided between the injection assembly and the seal plate, and the injection assembly is connected to the tubular plug It includes an injection tube that slides through the inside, a movable tube is screwed onto the outside of one end of the injection tube facing the storage tube, a positioning ring is connected to the outside of the movable tube near the storage tube, an injection piston is fixedly connected to the end of the movable tube, an injection hole communicating with the injection tube is opened at the center of the injection piston, several engagement blocks are fixedly connected in the circumferential direction to the inner wall of the storage tube near the seal plate, and the injection piston faces the seal plate On the side, several engagement grooves are provided in the circumferential direction for fitting into an engagement block, a dispensing tube is detachably connected to one end of the injection tube away from the injection piston, a first check valve is attached to the dispensing tube, a balance tube is provided above the injection tube, passing through a stopper and an injection piston in sequence, a connecting tube is connected to one end of the balance tube away from the injection piston, a second check valve is fixedly connected to the outside of the connecting tube, and the opening of the connecting tube is matched to a syringe.

[0008] The present invention further includes a connecting strip fixedly connected to the center of the seal plate on one side away from the injection needle, wherein the length of the connecting strip is greater than the length of the reservoir tube, and the end of the connecting strip away from the seal plate slides through the inlet hole into the movable tube, and position regulating grooves are provided on the top and bottom sides of the movable tube and the inlet tube, with both ends of the position regulating grooves communicating with the injection piston and the away end of the movable tube, respectively.

[0009] The present invention further includes a seal ring fixedly connected to the inside of the storage tube, the seal ring being rotatably fitted to the outside of the seal plate, and one side of the seal ring facing the injection piston being flush with the seal plate.

[0010] The present invention further includes the fact that one end of several of the guide holes away from the reservoir pipe all diffuses in a direction away from the center of the contact member.

[0011] The present invention further provides that the connecting strip has a plurality of through holes drilled at equal intervals along its length, and the thickness of the connecting strip is smaller than the diameter of the inlet hole.

[0012] The present invention further includes the fact that several support blocks are rotatably connected at equal intervals to one side of the inner wall of the delivery catheter away from the reservoir of the position-regulating ring, and insertion holes are provided in the support blocks through which the injection tube and balance tube slide.

[0013] The present invention further includes a compression plate fitted to the outside of one end of the drug dispensing tube closest to the injection tube, wherein the diameter of the compression plate is larger than the diameter of the injection tube.

[0014] The present invention further provides that the diameter of the contact member is the same as the outer diameter of the delivery catheter, and the edge of one end of the contact member that is separated from the delivery catheter is rounded.

[0015] Furthermore, the present invention provides that the frictional force between the injection piston and the inner wall of the storage tube is smaller than the frictional force between the outer wall of the storage tube and the inner wall of the delivery catheter. [Effects of the Invention]

[0016] The technical effects and advantages of the present invention are as follows:

[0017] 1. The present invention provides a storage tube that allows adjustment of the length of the movable tube protruding from the injection tube during injection, thereby controlling the distance between the injection piston and the seal plate. The volume of the space between the injection piston and the seal plate is the total amount of drug injected in one dose, and this method enables highly accurate control of the amount of drug injected per dose.

[0018] 2. By providing a balance tube and a storage tube, the present invention allows each injection drug to be temporarily stored in the storage tube, enabling precise control of the drug amount when multiple injections are required, and allowing preparation for the next injection without removing the injection tube, thus enabling multiple injections. Furthermore, if it is necessary to inject other drugs as part of combination therapy, gas can be injected into the balance tube to discharge any drug remaining in the injection tube from the previous injection, thereby avoiding over-administration of the previous drug and improving injection efficiency. [Brief explanation of the drawing]

[0019] [Figure 1] This is a schematic diagram of the overall structure of the present invention. [Figure 2] This is a cross-sectional view of the overall structure of the present invention. [Figure 3] This is an enlarged view of part A in Figure 2 of the present invention. [Figure 4] This is a perspective cross-sectional view of the storage pipe in the present invention. [Figure 5] This is an enlarged view of part B in Figure 4 of the present invention. [Figure 6] This is a schematic perspective view of the structure of the injection assembly, seal plate, connecting strip, and compression plate in the present invention. [Figure 7] It is a schematic perspective view of an injection piston and a movable tube in the present invention. MODE FOR CARRYING OUT THE INVENTION

[0020] Hereinafter, the present invention will be described in more detail with reference to the drawings. EXAMPLES

[0021] As shown in Figures 1 to 7, the device is an injection device for a heart failure drug, and includes a delivery catheter 1, a contact member 2 is connected to one end of the delivery catheter 1, and a plurality of guide holes 3 are drilled through the contact member 2, the diameter of the contact member 2 is the same as the outer diameter of the delivery catheter 1, the edge of the end of the contact member 2 away from the delivery catheter 1 is rounded, a storage tube 4 is slidably attached to the delivery catheter 1, a plurality of injection needles 5 are connected to the end of the storage tube 4 closest to the contact member 2, the injection needles 5 communicate with the inside of the storage tube 4, and the plurality of injection needles The needle 5 is inserted into multiple guide holes 3 in a one-to-one correspondence, a seal plate 6 is rotatably attached to the inner wall of one end of the storage tube 4 near the injection needle 5, multiple connection holes 7 are drilled through the seal plate 6, and the locations of the multiple connection holes 7 and the multiple injection needles 5 correspond one-to-one, the other end of the storage tube 4 is open, and a stopper 8 is rotatably connected to the open end of the storage tube 4, the injection assembly is inserted into the stopper 8 in a sliding manner, a connection assembly is provided between the injection assembly and the seal plate 6, and is located on one side of the stopper 8 away from the injection needle 5 A regulating ring 9 is provided, and the position regulating ring 9 is fixedly connected to the inner wall of the delivery catheter 1. The injection assembly includes an injection tube 10, which is inserted so as to slide through the stopper 8. A movable tube 11 is screwed onto one end of the injection tube 10 located inside the reservoir tube 4. A positioning ring 12 is fixedly connected to the edge of the other end of the movable tube 11 located outside the injection tube 10. An injection piston 13 is connected to the other end of the movable tube 11 away from the injection tube 10, and the injection piston 13 is connected to the inner wall of the reservoir tube 4. The frictional force between them is less than the frictional force between the outer wall of the storage tube 4 and the inner wall of the delivery catheter 1, an inlet hole 14 is opened through the center of the injection piston 13 and the inlet hole 14 communicates with the injection tube 10, a plurality of engagement blocks 15 are fixedly connected to the inner wall of the storage tube 4, the engagement blocks 15 are attached to one side of the seal plate 6 closer to the injection piston 13, the plurality of engagement blocks 15 are uniformly distributed in an annular shape on the inner wall of the storage tube 4, and engagement grooves 16 are opened at any of the edge positions on one side of the injection piston 13 facing the plurality of engagement blocks 15.The length of the engaging groove 16 is greater than the thickness of the engaging block 15, and the depth of the engaging groove 16 is greater than the height of the engaging block 15; a medication tube 17 is detachably connected to one end of the injection tube 10 away from the injection piston 13, and a first check valve 18 is provided on the medication tube 17; a balance tube 19 is provided at the top of the injection tube 10, the balance tube 19 is inserted through the tube plug 8 and the injection piston 13 in sequence, and is detachably connected between the balance tube 19 and the injection piston 13; a connecting tube 20 is detachably connected to one end of the balance tube 19 away from the injection piston 13, a second check valve 21 is provided on the connecting tube 20, and the diameter of the connecting tube 20 matches the diameter of an end opening of a conventional syringe.

[0022] The connecting assembly comprises a connecting strip 22, the connecting strip 22 is vertically and fixedly connected to the central position of one side of the seal plate 6 away from the injection needle 5, and the length of the connecting strip 22 is greater than the length of the storage tube 4; one end of the connecting strip 22 away from the seal plate 6 is in sliding contact with the movable tube 11 through the liquid inlet hole 14 of the injection piston 13, position-limiting grooves 23 that communicate with each other are opened on both the top inner walls and the bottom inner walls of the movable tube 11 and the liquid inlet hole 14, and both ends of the position-limiting grooves 23 communicate with the separated ends of the injection piston 13 and the movable tube 11, respectively.

[0023] Before injection, the injection assembly is adjusted first. The specific adjustment steps are as follows.

[0024] Step 1: Press the injection tube 10 to bring the injection piston 13 into close contact with the seal plate 6.

[0025] Step 2: The injection tube 10 and balance tube 19 are twisted, causing the injection piston 13 to begin rotating. When the multiple engagement grooves 16 in the injection piston 13 face the multiple engagement blocks 15 on the inner wall of the storage tube 4, the injection tube 10 and balance tube 19 press against the injection piston 13 again. This engages the engagement grooves 16 in the injection piston 13 with the corresponding engagement blocks 15.

[0026] Step 3: The injection tube 10 is twisted, and at this time the injection piston 13 is restricted by the engagement block 15 on the inner wall of the storage tube 4. As the injection tube 10 rotates, the movable tube 11 can gradually protrude from inside the injection tube 10, and the injection tube 10 can move away from the injection piston 13. As the distance the movable tube 11 protrudes from the injection tube 10 increases, when the injection tube 10 is pulled and the positioning ring 12 at its end contacts the plug 8, the volume of the space between the injection piston 13 and the seal plate 6 is the total amount of drug injected in one dose. This method enables highly accurate control of the amount of drug injected per dose.

[0027] Step 4: After completing the adjustment of the movable tube 11, pull the injection tube 10 to separate the injection piston 13 from the engagement block 15. Next, twist the injection tube 10 and balance tube 19, and at this time, since the injection piston 13 is not restricted by the engagement block 15, as the injection tube 10 and balance tube 19 are twisted, the injection piston 13 rotates simultaneously through the position regulating groove 23, the connecting strip 22 and the seal plate 6, thereby connecting the multiple connecting holes 7 in the seal plate 6 to the multiple injection needles 5 and completing the adjustment of the injection assembly.

[0028] When performing the injection procedure, first, the curved sheath (a sheath is a guide / positioning device commonly used in conventional interventional treatments) passes through the femoral artery and then the aortic arch, is curved and adjusted by the first layer of the curve adjustment sheath, passes the aortic valve position, and reaches the left ventricle. Finally, the distal end of the second sheath is brought into direct contact with the myocardial tissue, and then the delivery catheter 1 is inserted into the second sheath, with the contact member 2 at the end of the delivery catheter 1 coming into perpendicular contact with the myocardial tissue due to the guiding action of the second sheath.

[0029] Then, the decision to administer the injection is made, and the steps for making that decision are as follows:

[0030] Step 1: With the first check valve 18 closed, the second check valve 21 is opened. Next, the injection tube 10 and balance tube 19 are pressed, thereby moving the injection piston 13 toward the seal plate 6. During this process, as the injection piston 13 moves within the reservoir tube 4, air in the reservoir tube 4 can be expelled through the balance tube 19. When the injection piston 13 contacts the seal plate 6, the injection tube 10 and balance tube 19 are pressed further, thereby moving the injection needle 5 toward the myocardial tissue due to the pressure of the injection tube 10 and balance tube 19.

[0031] Step 2: As the storage tube 4 continues to move, the injection needle 5 gradually protrudes from the guide hole 3 and stops pressing the injection tube 10 and balance tube 19 when the storage tube 4 comes into contact with the contact member 2.

[0032] Step 3: Next, connect the conventional syringe to the connecting tube 20 and perform the extraction operation. If the syringe returns to its original position, it proves that the injection needle 5 has penetrated the myocardial tissue, and the subsequent injection procedure can be performed. If the syringe does not return to its original position, it proves that the injection needle 5 has not penetrated the myocardial tissue. The position of the contact member 2 needs to be readjusted to make it easier to penetrate again.

[0033] If it is determined that the injection can be performed, first the injection tube 10 is pulled to bring the positioning ring 12 into contact with the stopper 8, at which point the injection needle 5 is still embedded in the myocardial tissue. Then, the injection tube 10 is twisted to rotate the seal plate 6 via the connecting strip 22, thereby occluding the injection needle 5. Next, the first check valve 18 is opened, and the drug is injected into the injection tube 10 via the drug delivery tube 17. At this point, because the injection needle 5 is occluded, the drug injected into the injection tube 10 can enter the storage tube 4 via the inlet hole 14. As the amount of drug in the storage tube 4 gradually increases, the air in the storage tube 4 is expelled via the balance tube 19. After the storage tube 4 is filled with drug, a predetermined amount of drug is continued to be injected into the storage tube 4, and any excess drug enters the balance tube 19. The purpose of this operation is to completely expel the air from the storage tube 4 and avoid injecting air into the myocardial tissue. After the drug has been filled into the storage tube 4, the first check valve 18 and the second check valve 21 are closed first, and then the injection tube 10 is twisted to rotate the seal plate 6 via the connecting tube 20. This connects the connecting hole 7 in the seal plate 6 to the injection needle 5, and then the injection tube 10 is pressed. At this time, the injection piston 13 injects all of the drug in the storage tube 4 into the myocardial tissue due to the pressure of the injection tube 10, thereby achieving quantitative injection.

[0034] If a second injection is required, the drug can be added to the storage tube 4 using the drug addition method described above. After the drug addition is complete, the injection tube 10 can be pressed to administer the second injection, and the amount of drug injected each time will be the same. Simultaneously, multiple injections can be performed using the above procedure.

[0035] Furthermore, if it is necessary to inject other drugs as part of combination therapy, the first check valve 18 and the second check valve 21 can be opened simultaneously with the seal plate 6 closed to prevent residual drug from the previous injection in the injection tube 10. Next, gas is injected into the connecting tube 20, and as the gas is injected, it can enter the injection tube 10 via the storage tube 4. This allows residual drug from the previous injection to be discharged from the dispensing tube 17, preventing over-injection of the previous drug and improving injection efficiency as there is no need to re-insert the tube.

[0036] As shown in Figure 5, a seal ring 24 is rotatably fitted onto the outside of the seal plate 6, the seal ring 24 is fixedly connected to the inner wall of the storage pipe 4, and one side of the seal ring 24 closest to the injection piston 13 is flush with the seal plate 6.

[0037] By providing the seal ring 24, the seal ring 24 can improve the sealing performance between the side surface of the seal plate 6 and the inner wall of the storage tube 4. This prevents the drug from leaking out of the storage tube 4 through the gap between the seal plate 6 and the inner wall of the storage tube 4 when the drug is injected into the storage tube 4, and also ensures accuracy in detecting whether or not the injection needle 5 has penetrated the myocardial tissue using the syringe.

[0038] As shown in Figures 1 to 4, the length of the guide hole 3 is shorter than the length of the injection needle 5, and the end of each of the multiple guide holes 3 that is away from the reservoir 4 all diffuses in a direction away from the center of the contact member 2.

[0039] When the multiple injection needles 5 are pierced into the myocardial tissue by the guiding action of the guide holes 3, the multiple injection needles 5 can perform the injection operation in a diffuse manner with the center of the contact member 2 as the point, increasing the injection area of ​​the multiple injection needles 5 and improving the effect and efficiency of the drug.

[0040] As shown in Figures 4 to 7, the thickness of the connecting strip 22 is smaller than the diameter of the liquid inlet hole 14, and multiple through holes 25 are uniformly drilled through the connecting strip 22 along the front-to-back direction.

[0041] By providing a through-hole 25 in the connecting strip 22, when the drug enters the movable tube 11 and the inlet hole 14 via the injection tube 10, the through-hole 25 in the connecting strip 22 improves the speed at which the drug enters the storage tube 4 via the inlet hole 14 when the connecting strip 22 is inserted into the inlet hole 14, thereby ensuring injection efficiency.

[0042] As shown in Figure 2, multiple support blocks 26 are uniformly distributed within the delivery catheter 1, and all of the support blocks 26 are located on one side away from the reservoir 4 of the position regulating ring 9. The support blocks 26 are rotatably connected to the inner wall of the delivery catheter 1, and insertion holes are drilled through the support blocks 26 along both sides thereof. The injection tube 10 and the balance tube 19 are inserted so as to slide through the insertion holes of the multiple support blocks 26 in sequence.

[0043] By providing support blocks 26 within the delivery catheter 1, multiple support blocks 26 can support and restrict the portions of the injection tube 10 and balance tube 19 located within the delivery catheter 1. As a result, when the injection piston 13 is rotated by twisting the injection tube 10 and balance tube 19, the support blocks 26 can rotate together with the injection tube 10 and balance tube 19 around the center of the injection piston 13. This allows the injection tube 10 and balance tube 19 to be restricted by the support blocks 26 and always be bonded in parallel, preventing entanglement between the injection tube 10 and balance tube 19. Furthermore, when the injection piston 13 is pressed by the injection tube 10, the uniformly distributed support blocks 26 can support the outer wall of the injection tube 10, preventing bending of the injection tube 10 during the process of pressing the injection piston 13.

[0044] As shown in Figures 1 and 2, a compression plate 27 is fixed and fitted to one end of the dispensing tube 17 closest to the injection tube 10, and the diameter of the compression plate 27 is larger than the diameter of the injection tube 10. By providing the compression plate 27, when the injection piston 13 is pressed through the injection tube 10 to perform the injection operation, the compression plate 27 increases the contact area between the medical staff's hand and the dispensing tube 17, thereby improving the convenience of the injection operation.

[0045] These specific embodiments are merely interpretations of the present invention and do not limit it. Those skilled in the art may, after reading this specification, make modifications to these embodiments that lack inventive step as necessary. Any modifications within the scope of the claims of the present invention shall be protected under patent law. [Explanation of symbols]

[0046] 1. Delivery catheter 2 Contact Member 3 Guide holes 4 Storage pipe 5 Syringe needle 6 Seal Plate 7 connection holes 8 Pipe plug 9 Positioning ring 10 Injection tubes 11 Movable tube 12 Positioning ring 13 Injection piston 14 Liquid inlet 15 Engagement Block 16 Engagement groove 17. Medication Dispensing Tube 18. First check valve 19 Balance tube 20 connecting pipes 21. Second check valve 22 connection strips 23 Position regulating groove 24 sealing rings 25 Through holes 26 Support Block 27 Compression plate

Claims

1. An injection device for a heart failure drug, comprising a delivery catheter (1) and a contact member (2) provided at one end of the delivery catheter (1), wherein several guide holes (3) are made in the contact member (2), a storage tube (4) is slidably fitted into the delivery catheter (1), several injection needles (5) communicating with the storage tube (4) are provided at one end of the storage tube (4) near the contact member (2), several injection needles (5) corresponding one-to-one are slidably fitted into the multiple guide holes (3), and a seal plate (6) rotates within the inner wall of the end of the storage tube (4) near the injection needles (5). A movably connected seal plate (6) has several connection holes (7) through which multiple injection needles (5) are provided in a one-to-one correspondence, an opening is made at one end of the storage tube (4) away from the seal plate (6), a stopper (8) is rotatably connected to the opening of the storage tube (4), a position regulating ring (9) connected to the stopper (8) is fixedly connected to the inner wall of the delivery catheter (1) near the stopper (8), an injection assembly is provided on the stopper (8), and a connection assembly is provided between the injection assembly and the seal plate (6). The injection assembly includes an injection tube (10) that slides through the plug (8), a movable tube (11) is screwed onto the outside of one end of the injection tube (10) facing the storage tube (4), a positioning ring (12) is connected to the outside 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), an inlet hole (14) communicating with the injection tube (10) is opened at the center of the injection piston (13), several engagement blocks (15) are fixedly connected in the circumferential direction to the inner wall of the storage tube (4) near the seal plate (6), and the engagement block is attached to one side of the injection piston (13) facing the seal plate (6). An injection device for a heart failure drug, characterized in that several engagement grooves (16) are formed circumferentially on a fitting block (15), a drug delivery tube (17) is detachably connected to one end of the injection tube (10) away from the injection piston (13), a first check valve (18) is attached to the drug delivery tube (17), a balance tube (19) is provided above the injection tube (10) and passes through the stopper (8) and the injection piston (13) in sequence, a connecting tube (20) is connected to one end of the balance tube (19) away from the injection piston (13), a second check valve (21) is fixedly connected to the outside of the connecting tube (20), and the opening of the connecting tube (20) is matched to a syringe.

2. The injector for a heart failure drug according to claim 1, characterized in that the connecting assembly includes a connecting strip (22) fixedly connected to the center of the seal plate (6) on one side away from the injection needle (5), the length of the connecting strip (22) is greater than the length of the storage tube (4), one end of the connecting strip (22) away from the seal plate (6) passes through the inlet hole (14) and slides into contact with the inside of the movable tube (11), position regulating grooves (23) are opened on the top and bottom sides of the movable tube (11) and the inlet tube, and both ends of the position regulating grooves (23) communicate with the injection piston (13) and the away end of the movable tube (11), respectively.

3. An injection device for a heart failure drug according to claim 1, characterized in that a seal ring (24) is fixedly connected to the inside of the storage tube (4), and the seal ring (24) is rotatably fitted to the outside of the seal plate (6), and one side of the seal ring (24) facing the injection piston (13) is flush with the seal plate (6).

4. The injector for a heart failure drug according to claim 1, characterized in that one end of several of the guide holes (3) away from the storage tube (4) all diffuses in a direction away from the center of the contact member (2).

5. The injection device for a heart failure drug according to claim 2, characterized in that a plurality of through holes (25) are made in the connecting strip (22) at equal intervals in the longitudinal direction, and the thickness of the connecting strip (22) is smaller than the diameter of the injection hole (14).

6. An injection device for a heart failure drug according to claim 1, characterized in that several support blocks (26) are rotatably connected at equal intervals to one side of the inner wall of the delivery catheter (1) away from the storage tube (4) of the position regulating ring (9), and insertion holes are made in the support blocks (26) through which the injection tube (10) and the balance tube (19) slide.

7. An injection device for a heart failure drug according to claim 1, characterized in that a compression plate (27) is fitted to the outside of one end of the drug dispensing tube (17) closest to the injection tube (10), and the diameter of the compression plate (27) is larger than the diameter of the injection tube (10).

8. The injector for a heart failure drug according to claim 1, characterized in that the diameter of the contact member (2) is the same as the outer diameter of the delivery catheter (1), and the edge of one end of the contact member (2) that is separated from the delivery catheter (1) is rounded.

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

Images