A thrombus removal catheter and a catheter structure

Abstract

The present invention provides a thrombus removal catheter and a catheter structure, which relate to the technical field of medical devices, including a tube body, in which an injection chamber, a spray chamber and a guide wire chamber are arranged, the proximal end of the spray chamber is connected with the distal end of the injection chamber, and the distal end of the spray chamber is sealed; a spray hole is arranged on the side wall of the spray chamber; the spray chamber is also used for inserting a support wire, and the distal end of the spray chamber abuts against the distal end of the support wire; the guide wire chamber is eccentrically arranged in the tube body; the distal end and the proximal end of the guide wire chamber are respectively connected with the guide wire inlet and the guide wire outlet, the guide wire inlet is located at the distal end of the tube body, and the guide wire outlet is located on the tube wall of the tube body; the present invention solves a series of problems caused by the blocking of the tube body by a plug by arranging the spray chamber on the outside of the guide wire chamber and sealing the distal end of the spray chamber, so as to make the drug administration process more convenient; at the same time, it is also convenient to insert the support wire to support the thrombus removal catheter, increase its axial rigidity, and facilitate the placement of the thrombus removal catheter into the lesion position.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a thrombus removal catheter and a catheter structure. Background Art

[0002] Vascular embolism is a common symptom among vascular diseases, with extremely high disability and mortality rates. At present, the main treatments for this type of disease include mechanical thrombectomy, drug thrombolysis, catheter removal, etc. Catheter-contact thrombus removal is a common method for treating intravascular thrombosis. Its mechanism is to directly infuse high-concentration thrombolytic drugs around the thrombus through a catheter, thereby dissolving and removing the thrombus to achieve the purpose of treatment.

[0003] Existing thrombus removal catheters are usually kit-type, including a catheter body and a closed guidewire that plays a sealing role. During treatment, the independent guide wire is first inserted into the vein to the location of the embolic lesion through the skin, and then the thrombus removal catheter body is introduced into the vascular embolism site through the guide wire, and then the guide wire is withdrawn, and then the closed guidewire is inserted through the catheter to the matching point, and then the catheter body and the closed guidewire are connected to the drug delivery device, and the inner core is used to block the end of the catheter body near the patient to prevent the drug solution from overflowing from the end of the catheter, and to ensure that the drug solution is only released through the perfusion holes set on the side wall of the catheter, so as to achieve the purpose of uniform fixed-point drug delivery.

[0004] However, the sealing process of the end of the catheter body has very strict requirements on the size of the guidewire plug and the inner diameter of the catheter closure. If the gap between the guidewire plug and the end of the catheter body is matched and the gap is large, the front end of the catheter body will leak. If there is an interference fit, the guidewire plug will be stuck when it is pulled out. There is even a risk of deformation or breaking of the catheter, resulting in surgical failure or the need for further surgery. Therefore, it is usually necessary to control the gap between the two to less than 0.005mm to achieve a nearly complete closure effect, but this kind of matching accuracy has high processing and operation requirements, which is not conducive to the development of thrombus removal treatment.

[0005] Therefore, it is necessary to design a new structure to solve the above technical problems. Summary of the invention

[0006] The purpose of the present invention is to provide a thrombus removal catheter and a catheter structure to solve the problems existing in the above-mentioned prior art. By arranging the spray chamber outside the guide wire chamber and sealing the distal end of the spray chamber, a series of problems caused by the blocking of the tube body by the plug are solved, making the drug administration process more convenient and the difficulty of the operation greatly reduced; at the same time, it is also convenient to insert a support wire to support the thrombus removal catheter, increase its axial stiffness, and facilitate the placement of the thrombus removal catheter into the lesion site.

[0007] To achieve the above object, the present invention provides the following solutions:

[0008] A thrombus removal catheter comprises a tube body, in which an injection chamber, a spray chamber and a guide wire chamber are arranged, the proximal end of the injection chamber is used to connect to a drug delivery device; the proximal end of the spray chamber is connected to the distal end of the injection chamber, and the distal end of the spray chamber is sealed; a spray hole is arranged on the side wall of the spray chamber; the spray chamber is also used to insert a support wire, and the distal end of the spray chamber abuts against the distal end of the support wire; the guide wire chamber is eccentrically arranged in the tube body; the guide wire chamber is used to insert a guide wire, and the distal and proximal ends of the guide wire chamber are respectively connected to a guide wire inlet and a guide wire outlet, the guide wire inlet is located at the distal end of the tube body, and the guide wire outlet is located on the tube wall of the tube body.

[0009] As one embodiment, the proximal wall surface of the guidewire cavity is inclined from far to near toward the guidewire outlet side.

[0010] As an embodiment, the distal end of the tube body is a cone shape with a diameter gradually increasing from distal to proximal, and the guide wire inlet is arranged at the tip of the cone shape.

[0011] As an embodiment, the liquid injection hole is provided on the side wall of the liquid injection cavity.

[0012] As one embodiment, the tube body is provided with a first developing ring, a second developing ring, a third developing ring and a fourth developing ring, the first developing ring is located at the distal blocking position of the spray chamber, the second developing ring is located at the proximal position of the spray chamber, the third developing ring is located on the proximal side of the guide wire outlet, and the fourth developing ring is located at the proximal position of the distribution section of the spray hole on the side wall of the injection chamber.

[0013] The present invention also provides a catheter structure, comprising a catheter seat, a flexible rubber pad and an adapter tube seat, the distal end of the catheter seat being fixedly connected to the proximal end of the tube body in the above-mentioned thrombus removal catheter; a catheter seat cavity connected to the injection cavity is provided in the catheter seat; a clamping portion extending radially inward is provided on the inner wall of the catheter seat; the flexible rubber pad is arranged in the proximal port of the catheter seat, the flexible rubber pad has a mounting hole for passing a supporting wire, and the distal end of the flexible rubber pad abuts against the clamping portion; the distal end of the adapter tube seat is detachably connected to the proximal end of the catheter seat, and the distal end of the hollow column in the adapter tube seat abuts against the proximal end of the flexible rubber pad for squeezing the flexible rubber pad to clamp the supporting wire; an injection channel connected to the catheter seat cavity is provided in the catheter seat, and the proximal end of the adapter tube seat is used to connect a drug delivery device.

[0014] As one embodiment, a first annular flange is provided on the outer wall of the catheter seat, and an annular limiting portion extending radially inward is provided at the distal end of the adapter tube seat, the outer diameter of the first annular flange is larger than the inner diameter of the annular limiting portion, and the first annular flange is located on the proximal side of the annular limiting portion.

[0015] As one implementation, the catheter seat is connected to the adapter tube seat via a Luer connector structure.

[0016] As an implementation manner, a reinforcement tube is connected to the distal end of the catheter seat, and the reinforcement tube is sleeved on the outside of the tube body.

[0017] As an implementation manner, a second annular flange is disposed at the distal end of the outer wall of the catheter seat, and the catheter seat is clamped and fixed to the reinforcement tube via the second annular flange.

[0018] Compared with the prior art, the present invention has the following technical effects:

[0019] 1. The present invention arranges a guidewire cavity and a liquid spray cavity inside the catheter. The sealing arrangement of the liquid spray cavity will not affect the insertion of the guidewire from the tube body. The distal end sealing of the liquid spray cavity replaces the method of using a plug to seal the end of the tube body for liquid spraying, thereby solving a series of problems such as sticking, pulling off, incomplete sealing, great processing difficulty, and inconvenient operation caused by the plug sealing the tube body, making the drug administration process more convenient and greatly reducing the difficulty of surgery.

[0020] 2. The present invention leads out the guide wire by arranging a guide wire outlet on the tube wall instead of leading it out from the proximal port of the tube body, which will not affect the connection between the proximal port of the tube body and the drug delivery device. The guide wire does not need to be withdrawn during the injection process, thereby saving the surgical operation process, facilitating timely rescue of patients, and improving the survival rate of patients.

[0021] 3. In the present invention, after the guide wire cavity is eccentrically set in the catheter, the liquid spray cavity has a larger radial thickness, and a support wire can be inserted to support the tube body, thereby improving the axial rigidity of the tube body and avoiding excessive bending or even accumulation of the tube body due to insufficient rigidity during insertion. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] Figure 1 It is a schematic diagram of the overall structure of a catheter structure in one embodiment of the present invention;

[0024] Figure 2 for Figure 1 A front view of

[0025] Figure 3 for Figure 2 A partial enlarged view of the middle area A;

[0026] Figure 4 This is a schematic diagram of the cross-sectional structure of the guide wire cavity and the liquid spray cavity in the tube body in one embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram of the structure of a support wire and a guide wire in a thrombus removal catheter in one embodiment of the present invention;

[0028] Figure 6 A schematic diagram of the structure of a catheter seat in one embodiment of the present invention;

[0029] Figure 7 for Figure 6 A side sectional view of

[0030] Figure 8 A schematic diagram of the structure of a transfer tube holder in one embodiment of the present invention;

[0031] Fig. 9 for Figure 8 A side sectional view of

[0032] Fig.10 This is a schematic diagram of the structure of a flexible rubber pad in one embodiment of the present invention;

[0033] Fig.11 It is a schematic diagram of the assembly structure of the adapter tube seat, the catheter seat and the flexible rubber pad in one embodiment of the present invention;

[0034] Description of reference numerals:

[0035] 1. Tube body; 2. Liquid injection cavity; 3. Liquid spray cavity; 4. Guide wire cavity; 5. Liquid spray hole; 6. Guide wire inlet; 7. Guide wire outlet; 8. Guide wire; 9. First developing ring; 10. Second developing ring; 11. Third developing ring; 12. Fourth developing ring; 13. Support wire; 14. Catheter seat; 15. Flexible rubber pad; 16. Adapter tube seat; 17. Catheter seat cavity; 18. Mounting hole; 19. Liquid injection channel; 20. Hollow column; 21. Clamping part; 22. First annular flange; 23. Second annular flange; 24. Annular limiting part; 25. Reinforcement tube. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] The purpose of the present invention is to provide a thrombus removal catheter and a catheter structure to solve the problems existing in the prior art. By arranging a spray chamber on the outside of the guide wire chamber and sealing the distal end of the spray chamber, a series of problems caused by the blocking of the tube body by the plug are solved, making the drug administration process more convenient and greatly reducing the difficulty of the operation; at the same time, it is also convenient to insert a support wire to support the thrombus removal catheter, increase its axial stiffness, and facilitate the placement of the thrombus removal catheter into the lesion site.

[0038] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] Embodiment 1:

[0040] like Figure 1~Figure 5 As shown, a thrombus removal catheter comprises a tube body 1, in which an injection chamber 2, a spray chamber 3 and a guide wire chamber 4 are arranged, and the proximal end of the injection chamber 2 is used to connect to a drug delivery device. The proximal end in this embodiment refers to the end close to the holder of the tube body 1, that is, the end of the thrombus removal surgery performer, and the distal end refers to the end away from the thrombus removal surgery performer. The proximal end of the spray chamber 3 is connected to the distal end of the injection chamber 2, and the distal end of the spray chamber 3 is sealed. A spray hole 5 is arranged on the side wall of the spray chamber 3, and a plurality of spray holes 5 are arranged at intervals along the axial and circumferential directions of the tube body 1. A support wire 13 can also be inserted into the spray chamber 3. After the support wire 13 is inserted, the distal end of the support wire 13 abuts against the distal end of the spray chamber 3. The guide wire chamber 4 is eccentrically arranged in the tube body 1, and the side wall of the guide wire chamber 4 is connected to the tube wall of the tube body 1. The guidewire cavity 4 is used to insert a guide wire 8. The distal end and the proximal end of the guidewire cavity 4 are respectively connected to the guidewire inlet 6 and the guidewire outlet 7. The guidewire inlet 6 is located at the distal end of the tube body 1, and the guidewire outlet 7 is located on the tube wall of the tube body 1. As an embodiment, a partition wall is provided inside the tube body 1, and the partition wall is connected to the tube wall of the tube body 1. The partition wall divides the inner cavity of the tube body 1 into the guidewire cavity 4 and the liquid injection cavity 3. Figure 4 In this embodiment, the diameter of the guidewire cavity 4 is not greater than half of the inner diameter of the tube body 1. When the guidewire cavity 4 is eccentrically arranged in the tube body 1, the liquid injection cavity 3 still has a larger radial dimension, which allows and facilitates the insertion of the support wire 13.

[0041] When in use, firstly, the catheter sheath is inserted through percutaneous puncture, and then the guide wire 8 is inserted into the lesion along the sheath tube, and then the tube body 1 is inserted into the human body through the sheath tube along the guide wire 8. During insertion, the guide wire 8 enters the guide wire cavity 4 from the guide wire entrance 6 and is led out from the guide wire entrance 6. Then, the tube body 1 is inserted into the lesion along the guide wire 8. During the insertion process, the support wire 13 can be inserted into the liquid spray cavity 3. The distal end of the support wire 13 abuts against the distal end of the liquid spray cavity 3, which can support the entire tube body 1, improve the axial rigidity of the tube body 1, and avoid excessive bending or even accumulation of the tube body 1 due to insufficient rigidity during the insertion process; after the tube body 1 is inserted into the lesion, the support wire 13 is withdrawn, and the proximal port of the tube body 1 is connected to the drug delivery device, and the drug delivery device injects the liquid into the injection cavity 2. The liquid flows into the liquid spray cavity 3 under the action of pressure, and finally sprays out from the liquid spray hole 5, acting on the lesion to eliminate the thrombus.

[0042] Therefore, in this embodiment, by setting the guide wire cavity 4 and the liquid spray cavity 3 inside the catheter, the sealing setting of the liquid spray cavity 3 will not affect the insertion of the guide wire 8 from the tube body 1, and the distal sealing of the liquid spray cavity 3 replaces the method of using the plug to block the end of the tube body 1 for liquid spraying, and solves a series of problems such as blocking, pulling off, incomplete sealing, high processing difficulty, and inconvenient operation caused by the plug blocking the tube body 1, making the drug administration process more convenient and greatly reducing the difficulty of surgery. Moreover, in this embodiment, by setting the guide wire outlet 7 on the tube wall to lead out the guide wire 8, instead of leading it out from the proximal port of the tube body 1, it will not affect the connection between the proximal port of the tube body 1 and the drug administration device, and the guide wire 8 can be withdrawn during the injection process, thereby saving the surgical operation process, which is conducive to timely rescue of patients and improving the survival rate of patients. At the same time, after the guide wire cavity 4 is eccentrically set in the catheter, the liquid spray cavity 3 has a large radial thickness, and the support wire 13 can be inserted to support the tube body 1.

[0043] It should be noted that, in this embodiment, after the guide wire 8 is inserted into the guide wire cavity 4, the guide wire 8 also has a certain axial supporting effect on the portion of the tube body 1 where the guide wire cavity 4 is located.

[0044] As one embodiment, the proximal wall of the guidewire cavity 4 is inclined from distal to proximal toward the guidewire outlet 7 , and the guidewire 8 is more easily led out from the guidewire outlet 7 through the guidance of the inclined wall.

[0045] As one embodiment, the proximal wall surface at the guidewire outlet 7 gradually inclines radially outward from the tube body 1 from far to near. On the one hand, it can reduce the degree of scratching of the edge of the guidewire outlet 7 on the guide wire 8. On the other hand, it can make the guide wire 8 closer to the outer wall of the tube body 1, thereby making it easier to place the tube body 1 into the patient's site along the guide wire 8.

[0046] As an embodiment, the distal end of the tube body 1 is a tapered shape with a gradually increasing diameter from distal to proximal, and the guide wire inlet 6 is arranged at the tip of the tapered shape. The tapered shape of the distal end of the tube body 1 is more convenient for inserting into the blood vessel, and the tip edge of the tapered shape and the edge of the large diameter end of the tapered shape can be rounded to avoid scratching the blood vessel.

[0047] As an embodiment, a plurality of liquid spraying holes 5 are arranged on the side wall of the liquid injection cavity 2 to increase the liquid spraying area.

[0048] As an embodiment, the tube body 1 is provided with a first developing ring 9, a second developing ring 10, a third developing ring 11 and a fourth developing ring 12, the first developing ring 9 is located at the distal blocking position of the liquid spraying chamber 3, the second developing ring 10 is located at the proximal position of the liquid spraying chamber 3, the third developing ring 11 is located at the proximal side of the guide wire outlet 7, and the fourth developing ring 12 is located at the proximal position of the liquid spraying hole 5 on the side wall of the liquid injection chamber 2. The first developing ring 9, the second developing ring 10, the third developing ring 11 and the fourth developing ring 12 are all made of platinum-iridium alloy material, and are all fixed on the tube body 1 in the form of forging, and their function is to be able to develop under radiation irradiation. The first developing ring 9 and the second developing ring 10 can facilitate the operator to find the distal position and the proximal position of the liquid spraying chamber 3, the third developing ring 11 can facilitate the operator to find the guide wire outlet 7, and the fourth developing ring 12 can facilitate the operator to determine the proximal position of the liquid spraying hole 5 distribution section on the liquid injection chamber 2 to determine the liquid spraying range.

[0049] Embodiment 2:

[0050] like Figure 1 to Figure 11As shown, this embodiment provides a catheter structure, including a catheter seat 14, a flexible rubber pad 15 and an adapter tube seat 16, the distal end of the catheter seat 14 is fixedly connected to the proximal end of the tube body 1 in the thrombus removal catheter in Example 1; as an embodiment, the catheter seat 14 is connected to the tube body 1 by injection molding or bonding. The catheter seat 14 is provided with a catheter seat cavity 17 connected to the injection cavity 2, and the catheter seat cavity 17 has a tapered section with a gradually decreasing diameter from proximal to distal, and the small diameter end of the tapered section is connected to the injection cavity 2 through a diameter expansion section, and the diameter of the diameter expansion section is smaller than the diameter of the injection cavity 2. A clamping portion 21 extending radially inward is provided on the inner wall of the catheter seat 14; the flexible rubber pad 15 is in a truncated cone shape, and the small diameter section of the truncated cone is located at the distal end. The flexible rubber pad 15 is arranged in the proximal port of the catheter seat 14, and the flexible rubber pad 15 has a mounting hole 18 for passing the support wire 13. The distal end of the flexible rubber pad 15 abuts against the clamping portion 21 to achieve axial limitation of the flexible rubber pad 15. The distal end of the adapter tube seat 16 is detachably connected to the proximal end of the catheter seat 14. The adapter tube seat 16 has a hollow column 20, and the distal end of the hollow column 20 abuts against the proximal end of the flexible rubber pad 15, which is used to squeeze the flexible rubber pad 15 to clamp the support wire 13. When the flexible rubber pad 15 is not excessively squeezed and deformed, the mounting hole 18 of the flexible rubber pad 15 can be connected to the catheter seat cavity 17 to circulate the liquid medicine. The catheter seat 14 is provided with an injection channel 19 connected to the catheter seat cavity 17, and the proximal end of the adapter tube seat 16 is used to connect the drug delivery device. As an embodiment, the injection channel 19, the mounting hole 18, the catheter seat cavity 17 and the injection cavity 2 are coaxially arranged.

[0051] When in use, after the guide wire 8 is led out from the guide wire outlet 7, the support wire 13 is inserted into the injection cavity 2 in the tube body 1 from the mounting hole 18 of the flexible rubber pad 15, and the distal end of the support wire 13 abuts against the sealed distal end of the injection cavity 3; then the adapter tube seat 16 is fixedly connected to the catheter seat 14. When connected, the hollow column 20 in the adapter tube seat 16 squeezes the flexible rubber pad 15, causing the mounting hole 18 to deform, and the inner diameter becomes smaller to clamp the support wire 13. Then the adapter tube seat 16 and the catheter seat 14 are pushed forward along the guide wire 8 together, so that the injection cavity 3 of the tube body 1 reaches the lesion. It should be noted that during the pushing process, the tube body 1 is relatively soft, and it is easy to bend and accumulate without support, which makes it difficult for the tube body 1 to be pushed to the lesion. In this embodiment, the support wire 13 is located in the injection cavity 2, and the distal end of the support wire 13 abuts against the distal end of the injection cavity 2. Based on the self-strength of the support wire 13, the support wire 13 can axially support the tube body 1. When the tube body 1 is bent, the support of the support wire 13 can alleviate the situation where the tube body 1 is excessively bent or even piled up, thereby improving the success rate of pushing the tube body 1 to the lesion. After the tube body 1 is pushed to the lesion, the connection tightness between the adapter tube seat 16 and the catheter seat 14 is reduced, so that the flexible rubber pad 15 can completely or partially recover its deformation to enlarge the mounting hole 18 so that the support wire 13 can be taken out, and the mounting hole 18 can be used to circulate the liquid medicine; finally, the outer end of the adapter tube seat 16 is connected to the drug delivery device to deliver the drug and remove the thrombus.

[0052] In this embodiment, a conventional standard guide wire can be selected as the support wire 13, and the diameter of the support wire 13 can be a standard guide wire of 0.014 inches, 0.018 inches or 0.035 inches. Since the support wire 13 and the catheter seat 14 or the adapter tube seat 16 are both separately arranged, it is convenient to remove and replace. The operator can select a support wire 13 of appropriate specifications for support according to the support of the support wire 13 when pushing the tube body 1 during the operation, thereby providing more options for the operator.

[0053] As an embodiment, a first annular flange 22 is provided on the outer wall of the catheter seat 14. In this embodiment, the first annular flange 22 corresponds to the position of the clamping portion 21 inside and outside, which is convenient for molding. The distal end of the adapter tube seat 16 is provided with an annular limiting portion 24 extending radially inward. The outer diameter of the first annular flange 22 is larger than the inner diameter of the annular limiting portion 24, and the first annular flange 22 is located on the proximal side of the annular limiting portion 24. At the same time, the catheter seat 14 is connected to the adapter tube seat 16 through a Luer joint structure. When in use, the proximal end of the catheter seat 14 is inserted into the distal end of the adapter tube seat 16, so that the first annular flange 22 is located on the inner side of the annular limiting portion 24 to prevent the catheter seat 14 from falling off. Then the proximal end of the catheter seat 14 is screwed into the adapter tube seat 16. During the screwing process, the hollow column 20 in the adapter tube seat 16 squeezes the flexible rubber pad 15 so that it can clamp the support wire 13. In the process of screwing the catheter seat 14 out of the adapter tube seat 16, the squeezing force of the hollow column 20 on the flexible rubber pad 15 gradually decreases, so that the support wire 13 can be taken out.

[0054] In order to prevent the tube body 1 from being brittle or bent at the connection with the catheter seat 14, a reinforcement tube 25 is connected to the distal end of the catheter seat 14, and the reinforcement tube 25 is sleeved on the outer side of the tube body 1. The reinforcement tube 25 is made of a hard material, for example, Pebax (polyether block polyamide) injection molding. An annular groove is provided on the inner wall of the reinforcement tube 25, and a second annular flange 23 is provided at the distal end of the outer wall of the catheter seat 14. The catheter seat 14 is fixed to the reinforcement tube 25 by the clamping of the second annular flange 23 and the annular groove.

[0055] Adaptive changes made according to actual needs are all within the protection scope of the present invention.

[0056] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A thrombus removal catheter, characterized in that: It includes a pipe body, and the pipe body is provided with: A liquid injection cavity, wherein the proximal end of the liquid injection cavity is used for connecting to a drug delivery device; A liquid spraying chamber, wherein the proximal end of the liquid spraying chamber is connected to the distal end of the liquid injection chamber, and the distal end of the liquid spraying chamber is sealed; a liquid spraying hole is provided on the side wall of the liquid spraying chamber; the liquid spraying chamber is also used to penetrate the support wire, and the distal end of the liquid spraying chamber abuts against the distal end of the support wire; and a guidewire cavity, the guidewire cavity being eccentrically arranged in the tube body; the guidewire cavity being used for inserting a guidewire, the distal end and the proximal end of the guidewire cavity being respectively connected with a guidewire inlet and a guidewire outlet, the guidewire inlet being located at the distal end of the tube body, and the guidewire outlet being located on the tube wall of the tube body; The distal end of the tube body is in a tapered shape with a diameter gradually increasing from distal to proximal, and the guide wire inlet is arranged at the tip of the tapered shape.

2. The thrombus removal catheter according to claim 1, characterized in that: The proximal wall surface of the guidewire cavity is inclined from far to near toward the guidewire outlet.

3. The thrombus removal catheter according to claim 1, characterized in that: The liquid injection hole is arranged on the side wall of the liquid injection cavity.

4. The thrombus removal catheter according to claim 1, characterized in that: The tube body is provided with a first developing ring, a second developing ring, a third developing ring and a fourth developing ring, the first developing ring is located at a distal blocking position of the spray chamber, the second developing ring is located at a proximal position of the spray chamber, the third developing ring is located on the proximal side of the guide wire outlet, and the fourth developing ring is located at a proximal position of a distribution section of the spray hole on the side wall of the injection chamber.

5. A catheter structure, characterized in that: include: A catheter seat, wherein the distal end of the catheter seat is fixedly connected to the proximal end of the tube body in the thrombus removal catheter according to any one of claims 1 to 4; the catheter seat is provided with a catheter seat cavity connected to the injection cavity; and the inner wall of the catheter seat is provided with a clamping portion extending radially inward; A flexible rubber pad, the flexible rubber pad is arranged in the proximal port of the catheter seat, the flexible rubber pad has a mounting hole for passing a support wire, and the distal end of the flexible rubber pad abuts against the clamping portion; and a transfer tube seat, wherein the distal end of the transfer tube seat is detachably connected to the proximal end of the catheter seat, and the distal end of the hollow column in the transfer tube seat abuts against the proximal end of the flexible rubber pad, so as to squeeze the flexible rubber pad to clamp the support wire; The catheter seat is provided with an injection channel communicated with the catheter seat cavity, and the proximal end of the adapter tube seat is used for connecting a drug delivery device.

6. The catheter structure according to claim 5, characterized in that: A first annular flange is arranged on the outer wall of the catheter seat, and an annular limiting portion extending radially inward is arranged at the distal end of the adapter tube seat, the outer diameter of the first annular flange is larger than the inner diameter of the annular limiting portion, and the first annular flange is located on the proximal side of the annular limiting portion.

7. The catheter structure according to claim 5, characterized in that: The catheter seat is connected to the adapter tube seat via a Luer connector structure.

8. The catheter structure according to claim 5, characterized in that: The distal end of the catheter seat is connected with a reinforcement tube, and the reinforcement tube is sleeved on the outer side of the tube body.

9. The catheter structure according to claim 8, characterized in that: A second annular flange is disposed at the distal end of the outer wall of the catheter seat, and the catheter seat is clamped and fixed to the reinforcement tube via the second annular flange.

Images