A thrombus aspiration catheter

Abstract

The present invention provides a thrombus aspiration catheter, which relates to the technical field of medical devices, and comprises an adsorption tube body, an adjustable head end, a constraint wire channel and a constraint wire, wherein the proximal end of the adsorption tube body is used for connecting a negative pressure adsorption device, and the distal end of the adsorption tube body is used for adsorbing thrombus; the adjustable head end comprises an elastic skeleton and a film coated on the elastic skeleton, and the elastic skeleton stretches to make the adjustable head end present a conical structure, and the small diameter end of the conical structure is connected to the distal end of the adsorption tube body; the constraint wire channel comprises an annular segment arranged on the large diameter end of the conical structure; the constraint wire is inserted into the annular segment, and the end of the constraint wire is used for connecting to a constraint wire controller; when the constraint wire controller controls the action of the constraint wire, the diameter of the large diameter end of the conical structure is adjusted by the annular segment of the constraint wire channel; the present invention can not only improve the thrombus aspiration efficiency, but also avoid the problem of residual thrombus in the adsorption tube body leaking into the blood vessel and causing embolism again during the process of withdrawing the blood vessel.

Description

Technical Field

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

[0002] In recent years, cardiovascular disease has become a common disease worldwide. Among them, thrombosis, as one of the important causes of cardiovascular disease, seriously threatens the life and health of patients. Although traditional thrombosis treatment methods such as thrombolytic drugs and mechanical fragmentation have certain efficacy, they also have many shortcomings. In contrast, thrombus aspiration catheters have higher aspiration efficiency and safety, and have become one of the important means of thrombosis treatment.

[0003] The thrombus aspiration catheter is an important medical device, which is mainly used to quickly remove the thrombus in the blood vessel during vascular surgery or emergency treatment to restore the normal flow of blood. In order to improve the adsorption efficiency, the traditional thrombus adsorption catheter usually sets a funnel-shaped suction structure at the end of the adsorption tube body for assistance. However, the size of the funnel-shaped suction structure in the traditional adsorption catheter is fixed after extension, and it cannot be adjusted according to the size of the thrombus and the blood vessel. If the maximum diameter of the funnel-shaped suction structure does not match the diameter of the blood vessel, it may increase the risk of complications such as vascular damage, bleeding and infection. Moreover, the traditional funnel-shaped suction structure is usually located in the sheath in a contracted state. When suction is required, the adsorption tube body is pushed out of the sheath, and the funnel-shaped suction structure loses the restrictive effect of the sheath and expands into a funnel shape. This will result in that after the thrombus is sucked into the adsorption tube body, during the withdrawal of the adsorption tube body, the thrombus is easy to fall off from the end tube mouth of the adsorption tube body, increasing the risk of distal embolism.

[0004] Therefore, it is necessary to design a new type of suction catheter to solve the above technical problems. Summary of the invention

[0005] The purpose of the present invention is to provide a thrombus aspiration catheter to solve the problems existing in the above-mentioned prior art. It can not only improve the thrombus aspiration efficiency, but also avoid the problem of residual thrombus in the adsorption tube leaking into the blood vessel and causing embolism again during the withdrawal process of the blood vessel.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] A thrombus aspiration catheter comprises an adsorption tube body, an adjustable head end, a constraint wire channel and a constraint wire, wherein the proximal end of the adsorption tube body is used to connect to a negative pressure adsorption device, and the distal end of the adsorption tube body is used to adsorb thrombus; the adjustable head end comprises an elastic skeleton and a film coated on the elastic skeleton, and the elastic skeleton stretches to make the adjustable head end present a conical structure, and the small diameter end of the conical structure is connected to the distal end of the adsorption tube body; the constraint wire channel comprises an annular segment arranged on the large diameter end of the conical structure; the constraint wire is inserted into the annular segment, and the end of the constraint wire is used to connect to a constraint wire controller; when the constraint wire controller controls the action of the constraint wire, the diameter of the large diameter end of the conical structure is adjusted through the annular segment of the constraint wire channel.

[0008] As an embodiment, the constraint wire channel further includes a guide segment, the distal end of the guide segment is communicated with the annular segment, and the proximal end of the guide segment is connected to the constraint wire controller.

[0009] As an embodiment, it further comprises a constraining wire catheter, the internal cavity of the constraining wire catheter forms the constraining wire channel, and the distal end of the constraining wire catheter is an annular tube section arranged on the large diameter end of the conical structure.

[0010] As one embodiment, the annular pipe segment is arranged on the edge of the large diameter end of the conical structure; the constraint wire conduit also includes a main pipe segment arranged inside the adsorption tube body and a connecting pipe segment arranged on the conical structure, and the two ends of the connecting pipe segment are respectively connected to the distal end of the main pipe segment and the annular pipe segment.

[0011] As an implementation manner, the film and the annular tube segment are both made of polyurethane.

[0012] As an embodiment, the invention further comprises a thrombus breaker disposed inside the adsorption tube body, and a thrombus breaker is disposed at a distal end thereof.

[0013] As an embodiment, the bolt-breaking portion has a protruding portion protruding outwardly toward one axial side.

[0014] As an implementation manner, the bolt-breaking portion is a spring, and a round head is provided at the distal end of the spring.

[0015] As one embodiment, a Luer connector for connecting to a negative pressure adsorption device is provided at the proximal end of the adsorption tube body.

[0016] As an implementation manner, the elastic skeleton is made of a memory alloy.

[0017] Compared with the prior art, the present invention has the following technical effects:

[0018] 1. The present invention provides an annular channel for passing a restraining wire on the adjustable end, and cooperates with the deformable performance of the adjustable head end. By tightening or loosening the restraining wire, the size of the port at the large diameter end of the adjustable head end can be adjusted to match the size of the thrombus, thereby increasing the contact area between the adjustable head end and the thrombus, and facilitating the improvement of the suction efficiency;

[0019] 2. The present invention can use the large diameter end to fix the thrombus adhered to the inner wall of the blood vessel, and pull the adsorption tube body to detach the thrombus, thereby improving the ability to capture the thrombus;

[0020] 3. In the present invention, after the port of the large diameter end is closed by tightening the restraining wire, the problem of thrombus remaining in the adsorption tube body leaking back into the blood vessel and causing vascular embolism can be avoided during the process of withdrawing the adsorption tube body from the blood vessel. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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.

[0022] Figure 1 This is a schematic structural diagram of a thrombus aspiration catheter in one embodiment of the present invention;

[0023] Figure 2 for Figure 1 A partial enlarged view of the middle A area;

[0024] Figure 3 A schematic diagram of the structure of a restraining wire catheter in one embodiment of the present invention;

[0025] Figure 4 It is a schematic diagram of the arrangement structure of the restraining wire in the annular tube section of the restraining wire conduit in one embodiment of the present invention;

[0026] Figure 5 It is a structural schematic diagram of an adjustable head end when the elastic framework is in a wreath shape in one embodiment of the present invention;

[0027] Figure 6 It is a schematic structural diagram of an adjustable head end when the elastic skeleton is in a grid-like shape in one embodiment of the present invention;

[0028] Figure 7 It is a schematic structural diagram of an adjustable head end when the elastic skeleton is a continuous W-shaped mesh in one embodiment of the present invention;

[0029] Figure 8 It is a structural schematic diagram of an adjustable head end when the elastic skeleton is a continuous V-shaped mesh in one embodiment of the present invention;

[0030] Fig. 9 This is a schematic diagram of the structure of a thrombus breaker in one embodiment of the present invention;

[0031] Fig.10 A schematic diagram of a bolt-breaking process of a bolt-breaking device in one embodiment of the present invention;

[0032] Fig.11 It is a schematic diagram of the structure of the adsorption catheter in the process of withdrawing from the blood vessel after the thrombus aspiration is completed in one embodiment of the present invention;

[0033] Description of reference numerals:

[0034] 1. Adsorption tube body; 2. Adjustable head end; 21. Elastic skeleton; 22. Film; 3. Constraint wire catheter; 31. Ring pipe section; 32. Connecting pipe section; 33. Main pipe section; 4. Constraint wire; 5. Thrombus breaker; 51. Spring; 52. Round head; 53. Protrusion; 6. Constraint wire controller; 7. Luer connector. DETAILED DESCRIPTION

[0035] 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.

[0036] The purpose of the present invention is to provide a thrombus aspiration catheter to solve the problems existing in the prior art. It can not only improve the thrombus aspiration efficiency, but also avoid the problem of residual thrombus in the adsorption tube leaking into the blood vessel and causing embolism again during the withdrawal process of the blood vessel.

[0037] 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.

[0038] like Figure 1 to Figure 11As shown, the present embodiment provides a thrombus aspiration catheter, including an adsorption tube body 1, an adjustable head end 2, a constraint wire channel and a constraint wire 4. The proximal end of the adsorption tube body 1 is used to connect to a negative pressure adsorption device, and the distal end of the adsorption tube body 1 is used to adsorb thrombus. The proximal end in the present embodiment refers to the end close to the operator, and the distal end refers to the end away from the operator. The adjustable head end 2 includes an elastic skeleton 21 and a film 22 coated on the elastic skeleton 21. The elastic skeleton 21 can be deformed and contracted when subjected to force. When the external force is reduced or disappears, the elastic skeleton 21 stretches to make the adjustable head end 2 present a conical structure, and the small diameter end of the conical structure is connected to the distal end of the adsorption tube body 1. The conical structure mentioned in the present embodiment can be a truncated cone structure or a similar structure with a straight line as the main line, or a trumpet-shaped structure with a curved line as the main line, or a prism-shaped structure. The elastic skeleton 21 in the present embodiment can be a wreath-shaped structure (such as Figure 5 as shown), grid (as shown Figure 6 As shown), continuous W-shaped mesh (such as Figure 7 as shown) or a continuous V-shaped mesh (as shown Figure 8 As shown), the film 22 mainly supports the function of the film 22. The film 22 can be made of a material with biocompatibility, high elasticity and wear resistance. It is attached to the surface of the elastic skeleton 21 and cooperates with the elastic skeleton 21 to intercept thrombi and guide thrombi into the adsorption tube body 1. The constraint wire channel includes an annular segment arranged on the large diameter end of the conical structure; the constraint wire 4 is inserted into the annular segment, and the end of the constraint wire 4 is used to connect the constraint wire controller 6; when the constraint wire controller 6 controls the action of the constraint wire 4, the diameter of the large diameter end of the conical structure is adjusted through the annular segment of the constraint wire channel. When the constraint wire 4 is tightened, the constraint wire 4 tightens and contracts the large diameter end of the conical structure through the constraint wire channel, so that its diameter is reduced or the port of the large diameter end of the conical structure is directly closed. When the constraint wire 4 is relaxed, the elastic skeleton 21 stretches, and the port of the large diameter end expands or is fully opened.

[0039] It should be noted that the large-diameter end of the tapered structure mentioned in this embodiment actually refers to the distal end of the adjustable head end 2 , and the small-diameter end refers to the proximal end of the adjustable head end 2 .

[0040] When in use, tighten the constraint wire 4, the force of the constraint wire 4 acts on the large diameter end through the annular segment of the constraint wire channel, and the diameter of the large diameter end is reduced, which is convenient for sending it into the blood vessel; after the adjustable head end 2 is sent into the thrombus position, loosen the constraint wire 4, the diameter of the large diameter end becomes larger, and pull the constraint wire 4 in time according to the size of the thrombus and the diameter of the blood vessel, to avoid the constraint wire 4 continuing to relax, resulting in the diameter of the large diameter end being too different from the size of the thrombus or contacting the inner wall of the blood vessel to damage the blood vessel. After the large diameter end is opened to a suitable size, the inner wall of the adjustable port can be made close to the thrombus, and the negative pressure adsorption device can be turned on to adsorb the thrombus. If the thrombus sticks to the inner wall of the blood vessel and is difficult to adsorb by negative pressure, the large diameter end can be sleeved on the end of the thrombus, and then tighten the constraint wire 4, the port of the large diameter end is tightened to tighten the end of the thrombus, and the adsorption tube body 1 is pulled, and the thrombus can be torn off from the inner wall of the blood vessel by the large diameter end, which is more convenient for adsorption. After the adsorption is completed, the restraining wire 4 is tightened to seal the port at the large diameter end (the port diameter at the large diameter end may be smaller than that at the small diameter end), and the adsorption tube body 1 is withdrawn from the blood vessel. Fig.11 As shown, it is prevented that the thrombus remaining in the adsorption tube body 1 leaks out during the process of withdrawing the adsorption tube body 1 from the blood vessel, thereby preventing the embolism from occurring again.

[0041] Therefore, in this embodiment, an annular channel for passing a constraint wire 4 is provided at the adjustable end, and in combination with the deformable performance of the adjustable head end 2, the size of the port at the large diameter end of the adjustable head end 2 can be adjusted by tightening or loosening the constraint wire 4 to make it adapt to the size of the thrombus, thereby increasing the contact area between the adjustable head end 2 and the thrombus, thereby facilitating improving the suction efficiency; at the same time, the large diameter end can also be used to fix the thrombus adhered to the inner wall of the blood vessel, and the thrombus can be detached by pulling the adsorption tube body 1, thereby improving the ability to capture the thrombus; and after the port at the large diameter end is closed by tightening the constraint wire 4, the problem of the thrombus remaining in the adsorption tube body 1 leaking back into the blood vessel and causing vascular embolism can be avoided during the withdrawal of the adsorption tube body 1 from the blood vessel.

[0042] As an embodiment, the restraining wire channel further includes a guide segment, the distal end of the guide segment is connected to the annular segment, and the proximal end of the guide segment is connected to the restraining wire controller 6. The guide segment is used to guide the restraining wire 4 to the restraining wire controller 6. The restraining wire controller 6 can be an existing device, such as a guide wire controller capable of pulling the guide wire.

[0043] In this embodiment, one end of the restraining wire 4 can be fixed at a point of the ring segment in the restraining wire channel, and the other end of the restraining wire 4 can be led out for the surgeon to tighten or loosen; and the fixing point of the restraining wire 4 and the point where the restraining wire 4 is led out from the ring segment should be as close as possible to or located at one point to ensure that the port at the large diameter end can be completely closed when the restraining wire 4 is pulled. The restraining wire 4 can also be wound in the ring segment, with both ends led out for the surgeon to operate, such as Figure 4 shown.

[0044] The constraint wire channel in this embodiment is to make the constraint wire 4 distributed along the set trajectory. The structural form of the constraint wire channel can be various. For example, multiple hanging rings are arranged at intervals, and the constraint wire 4 is inserted into the hanging rings. In order to reduce the difficulty of forming the constraint wire channel, the present embodiment also includes a constraint wire conduit 3, and the internal cavity of the constraint wire conduit 3 forms a constraint wire channel, and the distal end of the constraint wire conduit 3 is an annular pipe section 31 arranged on the large diameter end of the conical structure. The annular pipe section 31 is arranged on the edge of the large diameter end of the conical structure, or the annular pipe section 31 is arranged at a position close to the edge of the large diameter end. The constraint wire conduit 3 also includes a main pipe section 33 arranged inside the adsorption tube body 1 and a connecting pipe section 32 arranged on the conical structure. Specifically, the connecting pipe section 32 is arranged along the busbar of the conical structure; the two ends of the connecting pipe section 32 are respectively connected to the distal end of the main pipe section 33 and the annular pipe section 31. The annular pipe section 31 and the connecting pipe section 32 can be integrally formed with the adjustable head end 2.

[0045] As an implementation mode, the film 22 and the annular tube section 31 in this embodiment are made of polyurethane. Polyurethane material has good biocompatibility, high elasticity and wear resistance, can stretch and return to its original shape when under pressure, and can soften at body temperature, which helps to reduce irritation and damage to the blood vessel wall and improve the patient's comfort. The material of the elastic skeleton 21 is a memory alloy, specifically, nickel-titanium alloy can be selected. Nickel-titanium alloy has unique superelasticity and shape memory effect, which enables the adjustable head end 2 to adapt to the dynamic changes of blood vessels after entering the body, and can return to the preset shape even after being subjected to external force, thereby providing continuous support.

[0046] As one embodiment, it also includes a thrombus crusher 5 disposed inside the adsorption tube body 1, and a thrombus crushing portion is disposed at the distal end of the thrombus crusher 5. The thrombus crushing portion has a protrusion 53 protruding outwardly toward one axial side. Compared with the structure that protrudes outwardly on both sides or expands in the circumferential direction, the protrusion 53 protruding outwardly toward one axial side is more conducive to reducing its radial size, which is convenient for it to pass into the adsorption tube body 1. Moreover, during the rotation of the thrombus crusher, the protrusion 53 protruding on one axial side can increase the thrombus crushing area after rotation, improve the thrombus crushing efficiency, and thus improve the thrombus suction efficiency. In this embodiment, the thrombus crushing portion is a spring 51, and a round head 52 is disposed at the distal end of the spring 51. The thrombus crusher 5 is tubular or linear as a whole, and a thrombus crushing portion is disposed at its distal end, and the proximal end is for the operator to operate, push, pull or rotate, and use the thrombus crushing portion to break the thrombus into small pieces for easy adsorption, such as Fig.10 shown.

[0047] As one embodiment, the proximal end of the adsorption tube body 1 is provided with a Luer connector 7 for connecting to a negative pressure adsorption device.

[0048] Adaptive changes made according to actual needs are all within the protection scope of the present invention.

[0049] 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 aspiration catheter, characterized in that: include: An adsorption tube body, wherein the proximal end of the adsorption tube body is used to connect to a negative pressure adsorption device, and the distal end of the adsorption tube body is used to adsorb thrombus; An adjustable head end, the adjustable head end comprising an elastic skeleton and a film coated on the elastic skeleton, the elastic skeleton stretching to make the adjustable head end present a conical structure, the small diameter end of the conical structure being connected to the distal end of the adsorption tube body; a constrained wire passage, the constrained wire passage comprising an annular segment disposed on the large diameter end of the tapered structure; and a restraining wire, wherein the restraining wire is inserted into the annular segment, and the end of the restraining wire is used to connect to a restraining wire controller; when the restraining wire controller controls the action of the restraining wire, the diameter of the large diameter end of the conical structure is adjusted through the annular segment of the restraining wire channel; It also includes a bolt breaker arranged inside the adsorption tube body, wherein a bolt-breaking portion is arranged at the distal end of the bolt breaker, and the bolt-breaking portion has a protrusion protruding outward toward one axial side, and the bolt-breaking portion is a spring, and a round head is arranged at the distal end of the spring.

2. The thrombus aspiration catheter according to claim 1, characterized in that: The restraining wire channel further comprises a guiding section, the distal end of the guiding section is communicated with the annular section, and the proximal end of the guiding section is connected with the restraining wire controller.

3. The thrombus aspiration catheter according to claim 2, characterized in that: It also includes a constraining wire catheter, the internal cavity of the constraining wire catheter forms the constraining wire channel, and the distal end of the constraining wire catheter is an annular tube section arranged on the large-diameter end of the conical structure.

4. The thrombus aspiration catheter according to claim 3, characterized in that: The annular pipe segment is arranged on the edge of the large diameter end of the conical structure; the constraint wire conduit also includes a main pipe segment arranged inside the adsorption tube body and a connecting pipe segment arranged on the conical structure, and the two ends of the connecting pipe segment are respectively connected to the distal end of the main pipe segment and the annular pipe segment.

5. The thrombus aspiration catheter according to claim 4, characterized in that: The film and the annular tube section are both made of polyurethane.

6. The thrombus aspiration catheter according to claim 1, characterized in that: The proximal end of the adsorption tube body is provided with a Luer connector for connecting to a negative pressure adsorption device.

7. The thrombus aspiration catheter according to claim 1, characterized in that: The elastic skeleton is made of memory alloy.

Images