Thrombectomy catheter

Abstract

The application discloses a thrombus removing catheter and belongs to the technical field of cardiovascular treatment instruments. The catheter is internally provided with a hollow catheter, one end of the catheter is internally provided with a blocking plug, the outer wall of the blocking plug is fixed to the inner wall of the catheter, the inside of the catheter is provided with a core tube, the outer surface of the core tube is slidably connected to the middle part of the blocking plug, and the flow gap is arranged between the outer surface of the core tube and the inner wall of the catheter, both ends of the core tube are arranged outside the two end parts of the catheter, the surface of the blocking plug close to the outside is provided with a hollow guide column, the inner surface of the guide column is fixed to the outer surface of the core tube, the guide column comprises a spliced cylindrical end and a tapered end, a plurality of circumferentially distributed guide sliding grooves are arranged on the outer surface of the guide column, and the guide sliding grooves are distributed on the cylindrical end and the tapered end. The technical scheme is used to improve the injection effect of thrombolytic liquid, reduce the thrombolysis time length and improve the thrombolysis efficiency.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of cardiovascular treatment devices, and particularly relates to a thrombus removal catheter. BACKGROUND

[0002] Vascular embolism is a common condition in vascular diseases, and has a very high rate of disability and death. At present, the main treatment methods for such diseases include mechanical thrombectomy and drug thrombolysis.

[0003] In the prior art, when injecting thrombolytic drugs into a thrombus, the drug solution is usually released through a through hole in the outer wall of the catheter, and the released drug solution can only contact the outer surface of the thrombus. For example, patent No. 202411479565.2 discloses a thrombolytic and thrombectomy device, which comprises a liquid injection pipe, a core pipe, an elastic framework and a thrombus collection structure. In this patent, the drug solution is released in the same way as in the prior art, which results in the drug solution only contacting the outer surface of the thrombus. This leads to a long thrombolysis time and low thrombolysis efficiency. SUMMARY

[0004] In view of the above, the purpose of the present application is to provide a thrombus removal catheter to improve the injection effect of the thrombolytic drug solution, reduce the thrombolysis time and improve the thrombolysis efficiency.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0006] The application discloses a thrombus removing catheter, which comprises a hollow catheter, a blocking plug arranged in the inside of the catheter, an outer wall of the blocking plug being fixed to the inner wall of the catheter, a core tube arranged in the inside of the catheter, an outer surface of the core tube being slidably connected to the middle part of the blocking plug, a flow gap being arranged between the outer surface of the core tube and the inner wall of the catheter, both ends of the core tube being arranged outside both ends of the catheter, a hollow guide column being arranged above the surface of the blocking plug close to the outside, an inner surface of the guide column being fixed to the outer surface of the core tube, the guide column comprising a spliced cylindrical end and a tapered end, a plurality of circumferentially distributed guide sliding grooves being arranged on the outer surface of the guide column, the guide sliding grooves being distributed on the cylindrical end and the tapered end, the tapered end being arranged close to the end of the catheter located outside, a plurality of side-by-side arranged injection needles being arranged in the guide sliding grooves, the injection needles being hollow, one end of the injection needle being slidably connected to the guide sliding groove, the other end of the injection needle being slidably connected to the outer wall of the catheter, a first developing ring and a second developing ring being arranged on the catheter, the first developing ring and the second developing ring being arranged outside both ends of the sliding connection part of the catheter and the injection needle, an injection joint being arranged on the surface of the end of the catheter located outside, the injection joint being communicated with the inside of the catheter, the injection needle being used for inserting into the inside of a thrombus block, the injection joint being used for injecting thrombolytic liquid into the inside of the catheter, the thrombolytic liquid flowing from the flow gap to the injection needle and flowing out of the thrombolytic liquid and being injected into the thrombus block.

[0007] Further, a plurality of circumferentially distributed auxiliary liquid inlet holes are arranged on the outer wall of one end of the injection needle located in the guide sliding groove, a wedge-shaped tip end is arranged on the other end of the injection needle.

[0008] Further, a cylindrical magnetic element is arranged above the tapered end of the guide column, the middle part of the cylindrical magnetic element being fixed to the core tube, one end of the guide sliding groove extending to the cylindrical magnetic element, when the end part of the injection needle is magnetically adsorbed in the guide sliding groove on the cylindrical magnetic element, the other end of the injection needle is located in the wall thickness of the catheter.

[0009] Further, a sliding ball head is arranged on the end of the injection needle facing the guide sliding groove, the diameter of the sliding ball head being larger than the diameter of the injection needle.

[0010] Further, a first stopper is arranged on the end of the core tube acting in the blood vessel, an elastic air bag is arranged between the first stopper and the end of the catheter, one end of the elastic air bag being fixed to the first stopper, the middle part of the elastic air bag being slidably connected to the core tube, a first magnetic ring being arranged on the other end of the elastic air bag, the first magnetic ring being slidably arranged on the core tube, the surface of the first magnetic ring being fixed to the elastic air bag, a second magnetic ring being arranged on the end of the catheter, the first magnetic ring and the second magnetic ring being arranged in mutual repulsion.

[0011] Further, the catheter is provided with a second stopper on one end outside the blood vessel, and the core tube is slidingly connected to the middle part of the second stopper.

[0012] Further, the catheter is provided with an outer tube on the outside, and the outer tube is provided with a blocking end on one end inside the blood vessel and a negative pressure assembly on one end outside the blood vessel.

[0013] The present application has the following advantages:

[0014] The present application can inject thrombolytic liquid into the inside of the thrombus, dissolve the thrombus from the inside, improve the dissolution effect and efficiency, and improve the thrombolysis effect.

[0015] Other advantages, objects, and features of the present application will be apparent from the following specification and will be learned from practice of the present application. The objects and other advantages of the present application can be achieved and obtained by the following specification. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to make the objects, technical solutions and advantages of the present application clearer, the present application provides the following drawings for illustration:

[0017] Fig. 1 Fig. 1 is a schematic diagram of the blood thrombus removing catheter in the working state;

[0018] Fig. 2 Fig. 4 is a schematic diagram of the injection thimble part in the working state of the blood thrombus removing catheter;

[0019] Fig. 3 Fig. 4 is a schematic diagram of the injection thimble part in the working state of the blood thrombus removing catheter;

[0020] Fig. 4 Fig. 4 is a schematic diagram of the injection thimble part in the working state of the blood thrombus removing catheter;

[0021] Fig. 5 Fig. 5 is a schematic diagram of the internal section view of the blood thrombus removing catheter in the working state;

[0022] Fig. 6 Fig. 6 is a schematic diagram of the installation position of the blocking plug and the guide column in the blood thrombus removing catheter.

[0023] The following marks are used in the drawings:

[0024] 1. Catheter; 2. Core tube; 3. Occlusive plug; 4. Flow gap; 5. Guide post; 6. Guide groove; 7. Injection needle; 8. Auxiliary inlet port; 9. Columnar magnetic element; 10. First stop block; 11. Elastic airbag; 12. First magnetic ring; 13. Second magnetic ring; 14. Injection connector; 15. Second stop block; 16. First contrast ring; 17. Second contrast ring; 18. Outer tube; 19. Occlusive end; 20. Thrombus. Detailed Implementation

[0025] like Figs. 1-6 As shown, this invention discloses a thrombus removal catheter, comprising a hollow catheter 1. A sealing plug 3 is located inside the end of the catheter 1 that acts on the inside of a blood vessel. The sealing plug 3 prevents excessive thrombolytic agents from leaking out from the gap between the catheter 1 and the core tube 2. The sealing plug 3 can be made of rubber, and its outer wall is fixed to the inner wall of the catheter 1. A core tube 2 is located inside the catheter 1, and its outer surface is slidably connected to the middle of the sealing plug 3. A flow gap 4 is provided between the outer surface of the core tube 2 and the inner wall of the catheter 1. Both ends of the core tube 2 are located on the outer sides of both ends of the catheter 1. A hollow guide post 5 is located above the outer surface of the sealing plug 3, which is near the outside. The inner surface of the guide post 5 is fixed to the outer surface of the core tube 2. The guide post 5 includes a cylindrical end and a conical end joined together. Several circumferentially distributed guide grooves 6 are provided on the outer surface of the guide post 5. The guide grooves 6 have a uniform depth and are distributed on the cylindrical end and the conical end. The conical end is located near the outer side of the catheter 1. The guide groove 6 is equipped with several parallel injection pins 7. The injection pins 7 are hollow inside. One end of the injection pin 7 is slidably connected to the guide groove 6, and the other end of the injection pin 7 is slidably connected to the outer wall of the catheter 1. The outer wall of the catheter 1 has through holes with the same number of injection pins 7. The catheter 1 is equipped with a first imaging ring 16 and a second imaging ring 17 (a metal ring made of platinum-iridium alloy, fixed in a forging form, whose function is to be visible under X-ray irradiation). The first imaging ring 16 and the second imaging ring 17 are located on the outer sides of the sliding connection between the catheter 1 and the injection pins 7. The surface of the catheter 1 at the outer end is equipped with an injection connector 14, which communicates with the interior of the catheter 1. The injection pins 7 are used to insert into the interior of the thrombus 20, and the injection connector 14 is used to inject thrombolytic drug into the interior of the catheter 1. The thrombolytic drug flows from the flow gap 4 to the injection pins 7 and flows out from the thrombolytic drug and is injected into the thrombus 20.

[0026] The working principle of the above technical solution is as follows:

[0027] Firstly, the catheter 1 is inserted along the blood vessel, so that the end of the catheter 1 penetrates the thrombus 20, and then the core tube 2 is pulled outwards, when the core tube 2 moves outwards, the guide column 5 moves in the catheter 1, that is, the end of the injection needle 7 moves from the guide groove 6 in the tapered end to the guide groove 6 on the cylindrical end, that is, the position of the end of the injection needle 7 is raised, at this time, the injection needle 7 is pushed outwards, that is, the injection needle 7 is inserted into the thrombus 20, and then, at this time, only the thrombolytic drug is injected from the injection connector 14, the drug will flow along the flow gap 4 to the guide column 5, and enter the injection needle 7 from the guide groove 6 arranged on the guide column 5, and then be discharged from the end of the injection needle 7 into the thrombus 20. In this way, the thrombolytic drug can be injected into the inside of the thrombus 20, so that the thrombus 20 begins to dissolve from the inside, improving the dissolution effect and dissolution efficiency, and improving the thrombolysis effect. Of course, it is not difficult to understand that the thrombolytic drug can also flow out from the gap between the catheter 1 and the core tube 2, and after flowing out, it can act on the surface of the thrombus 20, and then the thrombus 20 is dissolved inside and outside at the same time, further improving the thrombus removal effect and rate.

[0028] Of course, it is not difficult to understand that the length of the injection needle 7 should be small, so that it will not pierce the blood vessel after being stretched out, and this will not be described in detail here.

[0029] In an implementable manner, the end of the injection needle 7 is provided with a plurality of circumferentially distributed auxiliary liquid inlet holes 8 on the outer wall of the guide groove 6, and a wedge-shaped tip is arranged on the other end of the injection needle 7. The contact between the end of the injection needle 7 and the guide groove 6 can cause the end to be closed, therefore, the arrangement of the auxiliary liquid inlet hole 8 can ensure the normal liquid inlet of the injection needle 7, and the wedge-shaped tip can be understood as the needle tip part of the syringe, improving the effect of piercing the thrombus.

[0030] In an implementable manner, a columnar magnetic element 9 (magnet) is arranged above the tapered end of the guide column 5, the middle part of the columnar magnetic element 9 is fixed on the core tube 2, and one end of the guide groove 6 extends to the columnar magnetic element 9, when the end of the injection needle 7 is magnetically attracted to the guide slide on the columnar magnetic element 9, the other end of the injection needle 7 is located in the wall thickness of the catheter 1.

[0031] When the catheter 1 is in normal state, the end of the injection needle 7 is adsorbed on the columnar magnetic element 9, that is, the injection needle 7 is prevented from protruding out of the catheter 1, thereby avoiding the problem of inconvenience in use. When the core tube 2 slides outward, the position of the injection needle 7 is limited by the through hole provided on the catheter 1, so the injection needle 7 cannot move transversely and can only move with the guide sliding groove 6, thereby realizing the operation of the injection needle 7 being ejected. After the thrombolysis is completed, the core tube 2 is only needed to be reset, thereby driving the guide column 5 to be reset, and then the annular magnetic element adsorbs the end of the injection needle 7, so that the injection needle 7 is retracted, and the catheter 1 is convenient to be taken out subsequently. Of course, the part of the injection needle 7 protruding out of the catheter 1 and the part located in the catheter 1 are relatively short, because the diameter of the blood vessel is small, and the size is relatively large after being drawn in the drawing for the purpose of convenient observation.

[0032] In an implementable manner, the injection needle 7 is provided with a sliding ball head at one end thereof facing the guide sliding groove 6, the diameter of the sliding ball head is larger than that of the injection needle 7, and the sliding ball head limits the injection needle 7 to avoid the injection needle 7 from being pulled out of the catheter 1.

[0033] In an implementable manner, the end of the core tube 2 acting on the blood vessel is provided with a first stopper 10, the first stopper 10 and the end of the catheter 1 are provided with an elastic air bag 11 therebetween, the elastic air bag 11 is annular, one end of the elastic air bag 11 is fixed on the first stopper 10, the middle part of the elastic air bag 11 is slidably connected to the core tube 2, the other end of the elastic air bag 11 is provided with a first magnetic ring 12, the first magnetic ring 12 is slidably arranged on the core tube 2, and the surface of the first magnetic ring 12 is fixed on the elastic air bag 11, the end of the catheter 1 is provided with a second magnetic ring 13, and the first magnetic ring 12 and the second magnetic ring 13 are arranged to repel each other.

[0034] When the core tube 2 is pulled outward, the first magnetic ring 12 moves close to the second magnetic ring 13, and then under the repelling action of the two, the first magnetic ring 12 moves on the core tube 2, thereby pressing the elastic air bag 11, and then the elastic air bag 11 deforms to fill and block the blood vessel, thereby avoiding the dissolved thrombus 20 from flowing in the blood vessel. Of course, after the thrombolysis is completed, the core tube 2 is reset, so that the first magnetic ring 12 loses the force of the second magnetic ring 13, and then the elastic air bag 11 is reset.

[0035] In an implementable manner, the end of the catheter 1 located outside the blood vessel is provided with a second stopper 15, and the core tube 2 is slidably connected to the middle part of the second stopper 15, thereby further preventing the thrombolysis liquid from flowing out of the end of the catheter 1.

[0036] In an implementable mode, the outer side of the catheter 1 is further sleeved with an outer tube 18, the outer tube 18 is provided with a blocking end 19 on the end in the blood vessel, and the outer tube 18 is provided with a negative pressure assembly on the end outside the blood vessel. The negative pressure assembly provides negative pressure to the blood vessel for suction, thereby sucking out the dissolved thrombus 20 and a small amount of blood, and of course the blocking section can be understood as a ring-shaped hollow elastic assembly, which can be controlled to expand or reset through air pressure.

[0037] Finally, it should be pointed out that the above preferred embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present application.

Claims

1. A thrombectomy catheter, comprising: The utility model provides a hollow setting conduit (1) is acted to the inside of blood vessel, the inside of one end is equipped with the blocking plug (3) of blocking plug (3), the outer wall of blocking plug (3) is fixed on the inner wall of conduit (1), the inside of conduit (1) is equipped with the core tube (2), the outer surface of core tube (2) is slidingly connected in the middle part of blocking plug (3), and the outer surface of core tube (2) is equipped with flow gap (4) between the inner wall of conduit (1), the both ends of core tube (2) are set in the both ends of conduit (1) outside, the surface of blocking plug (3) is equipped with the hollow setting guide column (5) of outside, the inner surface of guide column (5) is fixed on the outer surface of core tube (2), and guide column (5) includes spliced cylindrical end and taper end, the outer surface of guide column (5) is equipped with a plurality of circumferentially distributed guide sliding slot (6), and guide sliding slot (6) is distributed on cylindrical end and taper end, and the taper end is close to the one end of conduit (1) and is located outside and is set, the guide sliding slot (6) is equipped with a plurality of side by side arranged injection needle (7) in, the inside of injection needle (7) is hollow, one end of injection needle (7) is slidingly connected in guide sliding slot (6), the other end of injection needle (7) is slidingly connected on the outer wall of conduit (1), the first developing ring (16) and second developing ring (17) are equipped on conduit (1), the first developing ring (16) and second developing ring (17) are set in the both ends outside of the sliding connection part of conduit (1) and injection needle (7), the surface of one end of conduit (1) is equipped with injection joint (14), injection joint (14) is communicated with the inside of conduit (1), injection needle (7) is used to insert the inside of thrombus block (20), injection joint (14) is used to inject thrombolytic drug liquid in the inside of conduit (1), and thrombolytic drug liquid flows from flow gap (4) to injection needle (7), and flows from thrombolytic drug liquid, and is injected into thrombus block (20); The first stop block (10) is arranged on one end of the core tube (2) for acting on the inside of the blood vessel, the elastic air bag (11) is arranged between the first stop block (10) and the end of the conduit (1), one end of the elastic air bag (11) is fixed on the first stop block (10), the middle part of the elastic air bag (11) is slidingly connected to the core tube (2), the other end of the elastic air bag (11) is provided with the first magnetic ring (12), the first magnetic ring (12) is slidingly arranged on the core tube (2), and the surface of the first magnetic ring (12) is fixed on the elastic air bag (11), the end of the conduit (1) is provided with the second magnetic ring (13), the first magnetic ring (12) and the second magnetic ring (13) are arranged in repulsion.

2. The thrombectomy catheter of claim 1, wherein: The one end of the injection needle (7) is provided with a plurality of circumferentially distributed auxiliary liquid inlet holes (8) on the outer wall, and the other end of the injection needle (7) is provided with a wedge-shaped tip.

3. The thrombectomy catheter of claim 1, wherein: The conical end of the guide column (5) is provided with a columnar magnetic element (9), the middle part of the columnar magnetic element (9) is fixed on the core pipe (2), one end of the guide chute (6) extends to the columnar magnetic element (9), when the end of the injection needle (7) is magnetically adsorbed in the guide chute on the columnar magnetic element (9), the other end of the injection needle (7) is located in the wall thickness of the catheter (1).

4. The thrombectomy catheter of claim 1, wherein: The injection needle (7) is provided with a sliding ball head on one end of the guide chute (6), the diameter of the sliding ball head is larger than the diameter of the injection needle (7).

5. The thrombectomy catheter of claim 1, wherein: The catheter (1) is provided with a second stop block (15) on one end outside the blood vessel, the core pipe (2) is slidingly connected to the middle part of the second stop block (15).

6. The thrombectomy catheter of claim 1, wherein: The outer side of the catheter (1) is further provided with an outer pipe (18), one end of the outer pipe (18) inside the blood vessel is provided with a blocking end (19), one end of the outer pipe (18) outside the blood vessel is provided with a negative pressure assembly.

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