Thrombus extraction catheter

Abstract

The utility model provides a kind of thrombus extraction catheter, including suction catheter body, the distal end of suction catheter body has the suction head for suction thrombus, the outer circumferential surface of suction head is distributed with two circumferentially spaced V-shaped suction grooves, V-shaped suction groove is communicated with the inner cavity of suction catheter body, the distal end of two V-shaped suction grooves is large mouth end, the distal end of two V-shaped suction grooves is connected, two V-shaped suction grooves are separated into two circumferentially spaced half-cone needle tip petal by suction head.The suction head is set apart two V-shaped suction grooves in front end, in the process of thrombus suction, if suction force is too large to cause one of V-shaped suction grooves to adhere to blood vessel wall, and the other V-shaped suction groove opposite to its opening direction can continue to suction thrombus, greatly reduce the probability of thrombus or blood vessel wall to block suction head.

Description

Technical Field

[0001] This utility model relates to the field of thrombus extraction technology, specifically a thrombus extraction catheter. Background Technology

[0002] A thrombus is a solid mass formed by the abnormal coagulation of blood within a blood vessel. It can block blood vessels, affect blood circulation, and in severe cases, cause health problems such as stroke and myocardial infarction.

[0003] In current thrombectomy treatments, sometimes a beveled needle is inserted into the blood vessel, such as... Figure 1 As shown in the diagram, the thrombus is then extracted through the connected tubing and aspiration device. The beveled design increases the contact area, making it easier for the catheter to capture and aspirate the thrombus. However, when the aspiration pressure is too high, the blood vessel wall can be sucked into the beveled opening, causing blockage of the needle and affecting the aspiration effect. Utility Model Content

[0004] The purpose of this invention is to provide a thrombus aspiration catheter, which aims to solve the problem in the prior art where the needle with a beveled design is prone to causing the blood vessel wall to be sucked into the beveled opening and block the needle when the suction pressure is too high.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a thrombus aspiration catheter, comprising an aspiration catheter body, the distal end of which has an aspiration head for aspirating thrombi, the outer circumferential surface of which is distributed with two circumferentially spaced V-shaped aspiration grooves, the V-shaped aspiration grooves communicating with the inner lumen of the aspiration catheter body, the distal ends of the two V-shaped aspiration grooves being the wide end, the distal ends of the two V-shaped aspiration grooves being connected, and the two V-shaped aspiration grooves dividing the aspiration head into two circumferentially spaced semi-conical needle tip flaps.

[0006] Preferably, the suction head further includes a suction tube, and the two semi-conical needle tips are hinged to the front end of the suction tube. The front end of the suction tube is provided with a spring for pushing the two semi-conical needle tips closer to each other, and the suction tube is also provided with a pulling mechanism for pulling the two semi-conical needle tips to flip away from each other.

[0007] Preferably, the binding mechanism includes a flexible pull cord fixedly connected to the semi-conical needle tip. Preferably, the straw and the semi-conical needle tip have grooves extending along the axial direction, and the flexible pull cord is disposed inside the grooves.

[0008] Preferably, both the straw and the semi-conical needle tip are provided with through holes.

[0009] Preferably, an elastic ring is fitted at the connection between the straw and the semi-conical needle tip.

[0010] Preferably, a limiting ring is coaxially sleeved on the straw.

[0011] The beneficial effects of this utility model are:

[0012] 1. When using this utility model, by setting two V-shaped suction grooves at intervals at the front end of the suction head, if the suction force is too large during the thrombus suction process, causing one of the V-shaped suction grooves to adhere to the blood vessel wall, the other V-shaped suction groove, which is opened in the opposite direction, can continue to suction the thrombus, greatly reducing the probability of the thrombus or blood vessel wall blocking the suction head.

[0013] 2. In use, this utility model uses a spring to push the two semi-conical needle tips closer together, forming a cone-like shape, thus reducing the area occupied by the front end. At this time, the two semi-conical needle tips are away from the blood vessel wall, preventing the front end of the two semi-conical needle tips from getting too close to the blood vessel wall and puncturing it during the movement of the suction head in the blood vessel. At the same time, the tie mechanism controls the two semi-conical needle tips to flip to the side away from each other, thereby controlling the opening and closing angle between the two semi-conical needle tips. When the suction head reaches the vicinity of the thrombus, medical staff can pull the tie mechanism to control the semi-conical needle tips to flip and open, so as to extract the thrombus. Attached Figure Description

[0014] The above and other objects, features, and advantages of this disclosure will become readily apparent from the following detailed description of exemplary embodiments with reference to the accompanying drawings. In the drawings, several embodiments of this disclosure are illustrated by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding portions, wherein:

[0015] Figure 1 This is a schematic diagram of the oblique needle in a blood vessel according to a specific embodiment of this utility model;

[0016] Figure 2 This is a schematic diagram of the structure of the two semi-conical needle tip flaps when they are closed, according to a specific embodiment of this utility model;

[0017] Figure 3 This is a schematic diagram of the structure of the two semi-conical needle tip lobes when they unfold in a specific embodiment of this utility model;

[0018] Figure 4 This is a schematic diagram of the connection between the straw and the semi-conical needle tip in a specific embodiment of this utility model;

[0019] Figure 5 This is a specific embodiment of the present utility model. Figure 4 Enlarged structural diagram at point A in the middle.

[0020] In the diagram: 1. Suction tube body; 2. Suction tube; 3. Semi-conical needle tip flap; 4. Spring; 5. Groove; 6. Shape memory alloy; 7. Limiting ring; 8. Through hole; 9. Elastic ring; 10. V-shaped suction groove; 11. Suction head. Detailed Implementation

[0021] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0022] To facilitate understanding of this utility model, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. The accompanying drawings show preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0023] It should be noted that, unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention.

[0024] like Figure 1-5 As shown, a thrombus aspiration catheter includes an aspiration catheter body 1. The distal end of the aspiration catheter body 1 has an aspiration head 11 for aspirating thrombi. The outer circumferential surface of the aspiration head 11 has two circumferentially spaced V-shaped aspiration grooves 10. The V-shaped aspiration grooves 10 communicate with the inner lumen of the aspiration catheter body 2. The distal ends of the two V-shaped aspiration grooves 10 are large-mouth ends and are connected. The two V-shaped aspiration grooves 10 divide the aspiration head 11 into two circumferentially spaced semi-conical needle tip flaps 3.

[0025] In this embodiment, by setting two V-shaped suction grooves 10 at intervals at the front end of the suction head 11, if the suction force is too large during the thrombus suction process, causing one of the V-shaped suction grooves 10 to adhere to the blood vessel wall, the other V-shaped suction groove 10, which is opened in the opposite direction, can continue to suction the thrombus, greatly reducing the probability of the thrombus or blood vessel wall blocking the suction head 11.

[0026] like Figure 4 As shown, the suction head 11 also includes a suction tube 2, and two semi-conical needle tips 3 are hinged to the front end of the suction tube 2. The front end of the suction tube 2 is provided with a spring 4 for pushing the two semi-conical needle tips 3 closer to each other. The suction tube 2 is also provided with a pulling mechanism for pulling the two semi-conical needle tips 3 to flip away from each other.

[0027] In this embodiment, the spring 4 allows the two semi-conical needle tip flaps 3 to move closer to each other, forming a cone-like shape and reducing the area of ​​the front end. At this time, the two semi-conical needle tip flaps 3 are far away from the blood vessel wall, preventing the front end of the two semi-conical needle tip flaps 3 from getting too close to the blood vessel wall and puncturing the blood vessel wall during the movement of the suction head 11 in the blood vessel. At the same time, the tie mechanism controls the two semi-conical needle tip flaps 3 to flip to the side away from each other, thereby controlling the opening and closing angle between the two semi-conical needle tip flaps 3. When the suction head reaches the vicinity of the thrombus, medical staff can pull the tie mechanism to control the semi-conical needle tip flaps 3 to flip and open so as to extract the thrombus.

[0028] like Figure 2 As shown, the tying mechanism includes a flexible pull rope 6 that is fixedly connected to the semi-conical needle tip 3.

[0029] In this embodiment, each semi-conical needle tip flap 3 is connected to a flexible pull cord 6. The length of the flexible pull cord 6 should match the length of the aspiration catheter body 1. When the aspiration head 11 is located at the thrombus in the blood vessel, the other end of the two flexible pull cords 6 is outside the patient's body, which makes it convenient for medical staff to pull the flexible pull cords 6 to control the opening and closing angle between the two semi-conical needle tip flaps 3.

[0030] like Figure 1 As shown, grooves 5 are provided on the straw 2 and the semi-conical needle tip 3 along the axial extension direction, and the flexible pull rope 6 is disposed inside the grooves 5.

[0031] In this embodiment, the flexible pull rope 6 is embedded inside the groove 5 by setting the groove 5, so as to avoid the flexible pull rope 6 protruding and contacting the blood vessel wall when it is pulled, which would cause discomfort to the patient.

[0032] like Figure 4 As shown, both the straw 2 and the semi-conical needle tip 3 have through holes 8.

[0033] In this embodiment, by opening a through hole 8, the suction force on the blood vessel wall is shared.

[0034] like Figure 2 As shown, an elastic ring 9 is fitted at the connection between the straw 2 and the semi-conical needle tip 3.

[0035] In this embodiment, the transition between the semi-conical needle tip 3 and the straw 2 is made smoother by setting the elastic ring 9.

[0036] like Figure 1 As shown, a limiting ring 7 is coaxially sleeved on the straw 2.

[0037] In this embodiment, multiple limiting rings 7 can be provided at intervals to prevent the flexible pull rope 6 from coming out of the groove 5.

[0038] Working principle: By setting two V-shaped suction grooves 10 at intervals at the front end of the suction head 11, during thrombus aspiration, if the suction force is too large and one of the V-shaped suction grooves 10 adheres to the blood vessel wall, the other V-shaped suction groove 10, which is in the opposite direction, can continue to aspirate the thrombus, greatly reducing the probability of thrombus or blood vessel wall clogging the suction head 11. When the suction head 11 needs to move forward in the blood vessel, the two semi-conical needle tip flaps 3 are pushed by the spring 4 and move closer to each other, forming a cone-like shape, reducing the area occupied at the front end of the suction head 11. Being far from the blood vessel wall, it can move freely inside the blood vessel, avoiding the risk of the two semi-conical needle tip flaps 3 puncturing the blood vessel wall. When the suction head 11 reaches the designated position, medical staff can pull the two flexible pull ropes 6 to control the opening angle between the two semi-conical needle tip flaps 3, so that the two semi-conical needle tip flaps 3 unfold to expose the opening of the suction tube 2, allowing for continued suction of the thrombus. At the same time, the through holes 8 on the suction tube 2 and the semi-conical needle tip flaps 3 disperse the suction force on the blood vessel wall, reducing the probability of the V-shaped suction groove 10 adhering to the blood vessel wall, and preventing the thrombus or blood vessel wall from blocking the suction head 11.

[0039] In the foregoing description of this specification, unless otherwise expressly specified and limited, the terms "fixed," "installed," "connected," or "joined" should be interpreted broadly. For example, the term "joined" can refer to a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; or it can refer to the internal communication of two components or the interaction between two components. Therefore, unless otherwise expressly limited in this specification, those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0040] Based on the above description in this specification, those skilled in the art will also understand that terms used, such as "upper," "lower," "front," "rear," "left," "right," "length," "width," "thickness," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," "center," "longitudinal," "transverse," "clockwise," or "counterclockwise," are terms indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings of this specification. They are only for the purpose of facilitating the explanation of the present invention and simplifying the description, and do not imply that the device or element involved must have the specific orientation, or be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms should not be understood or interpreted as limitations on the present invention.

[0041] Furthermore, the terms "first" or "second," etc., used in this specification to refer to numbers or ordinal numbers are for descriptive purposes only and should not be construed as indicating, explicitly or implicitly, relative importance or specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this specification, "a plurality of" means at least two, such as two, three, or more, unless otherwise explicitly specified.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A thrombus aspiration catheter, comprising an aspiration catheter body (1), the distal end of which has an aspiration head (11) for aspirating thrombi, characterized in that: The outer circumferential surface of the suction head (11) is provided with two V-shaped suction grooves (10) arranged circumferentially. The V-shaped suction grooves (10) are connected to the inner cavity of the suction catheter body (1). The distal ends of the two V-shaped suction grooves (10) are the large opening ends. The distal ends of the two V-shaped suction grooves (10) are connected. The two V-shaped suction grooves (10) divide the suction head (11) into two semi-conical needle tip flaps (3) arranged circumferentially.

2. The thrombus extraction catheter according to claim 1, characterized in that, The suction head (11) also includes a suction tube (2), and the two semi-conical needle tips (3) are hinged to the front end of the suction tube (2). The front end of the suction tube (2) is provided with a spring (4) for pushing the two semi-conical needle tips (3) closer to each other. The suction tube (2) is also provided with a pulling mechanism for pulling the two semi-conical needle tips (3) to flip away from each other.

3. The thrombus aspiration catheter according to claim 2, characterized in that, The tying mechanism includes a flexible pull rope (6) fixedly connected to a semi-conical needle tip (3).

4. A thrombus aspiration catheter according to claim 3, characterized in that, The straw (2) and the semi-conical needle tip (3) are provided with grooves (5) extending along the axial direction, and the flexible pull rope (6) is disposed inside the grooves (5).

5. A thrombus aspiration catheter according to claim 4, characterized in that, Both the straw (2) and the semi-conical needle tip (3) are provided with through holes (8).

6. A thrombus aspiration catheter according to claim 5, characterized in that, An elastic ring (9) is fitted at the connection between the straw (2) and the semi-conical needle tip (3).

7. A thrombus aspiration catheter according to claim 5, characterized in that, A limiting ring (7) is coaxially sleeved on the straw (2).

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