Suction thrombus suction catheter

Abstract

The utility model relates to the technical field of medical instruments, in particular to a suction thrombus suction catheter. The suction thrombectomy catheter comprises an outer tube and an thrombectomy inner tube, a plurality of fan-shaped elastic valves are arranged on the far end portion of the outer tube in the circumferential direction of the outer tube, the thrombectomy inner tube penetrates through an inner cavity of the outer tube, the far end of the thrombectomy inner tube can penetrate out or retract from the far end of the outer tube, and the thrombectomy inner tube is connected with the thrombectomy catheter. When the far end of the thrombectomy inner tube penetrates out of the far end of the outer tube, the valve is pushed outwards to be opened and deforms, and when the far end of the thrombectomy inner tube retracts into the far end of the outer tube, the valve recovers to the initial state and blocks the far end port of the outer tube. The thrombus removing device has the advantages that the structural design is simple and reasonable, the thrombus can be cut off in the thrombus removing process by matching the back-and-forth movement of the thrombus removing inner tube with the opening and closing of the valve, and the thrombus can be safely and effectively removed.

Description

Technical Field

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

[0002] Thrombosis is the process of blood coagulation or the aggregation of certain organic matter within the heart and blood vessels of a living organism, forming a solid mass. This solid mass is called a thrombus. Unlike a blood clot, a thrombus forms while blood is flowing.

[0003] Clinically, the primary treatment for thrombosis is thrombolysis. After local anesthesia, the patient undergoes vascular puncture and insertion of a catheter and guidewire to the site of the lesion. After intravascular angiography, the blocked segment is identified, and thrombolytic drugs are then injected for superselective thrombolysis. This thrombolysis method requires blocking distal small vessels, a process that requires the use of many different types of equipment and is complex. Furthermore, the optimal operating position of the surgeon must be considered during the procedure.

[0004] In addition, some treatments utilize direct negative pressure aspiration of the thrombus through a catheter. However, during the aspiration process, since the thrombus may be a large plaque, it is difficult to aspirate the entire plaque through a conventional catheter. Consequently, the thrombus plaque can easily become blocked at the distal end of the catheter, hindering effective thrombus removal.

[0005] Based on this, it is necessary to improve the existing catheter negative pressure thrombectomy so that the thrombus can be removed in small pieces to ensure smooth and effective thrombectomy. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide a thrombus aspiration catheter, which effectively overcomes the defects of the prior art.

[0007] The technical solution of the utility model to solve the above technical problems is as follows:

[0008] A thrombus removal catheter comprises an outer tube and an inner thrombus removal tube, the distal end of the outer tube being provided with a plurality of fan-shaped elastic valves along its circumference, the inner thrombus removal tube passing through the inner cavity of the outer tube, the distal end of the inner thrombus removal tube being able to pass through or retract from the distal end of the outer tube, and when the distal end of the inner thrombus removal tube passes through the distal end of the outer tube, the valve is pushed outward to open and deformed, and when the distal end of the inner thrombus removal tube is retracted to the distal end of the outer tube, the valve returns to its initial state and blocks the distal port of the outer tube.

[0009] On the basis of the above technical solution, the present invention can also be improved as follows.

[0010] Furthermore, a protective sleeve is provided on the distal end of the outer tube.

[0011] Furthermore, a joint is provided at the proximal end of the outer tube, and the proximal end of the thrombus removal inner tube is sealed and passes through the joint.

[0012] Furthermore, the proximal end of the thrombectomy inner tube is connected to a negative pressure joint, and the negative pressure joint is connected to a negative pressure monitor.

[0013] Furthermore, the joint is connected to a positive pressure interface communicating with its inner cavity.

[0014] Furthermore, the connector is a Y-type connector, the proximal end of the thrombectomy inner tube passes through one interface of the connector, the other interface of the connector constitutes the positive pressure interface, and a positive pressure gap is formed between the outer tube and the thrombectomy inner tube.

[0015] Furthermore, a traction cavity is provided inside one side of the side wall of the outer tube along its length direction, and a traction wire is provided in the traction cavity. One end of the traction wire is connected and fixed to the distal end of the outer tube, and the other end passes through the proximal side wall of the outer tube.

[0016] Furthermore, a wire-taking knob is provided at the proximal end of the outer tube, and the other end of the traction wire is wound around the wire-taking knob.

[0017] Furthermore, the outer tube is made of polyurethane, polyvinyl chloride or polyethylene pipe.

[0018] Furthermore, the surface of the thrombus removal inner tube is provided with an SPFA lubricating, hydrophobic and anti-stick coating.

[0019] The beneficial effects of the utility model are: simple and reasonable structural design, and the ability to cut and cut off the thrombus during the thrombus removal process by coordinating the back-and-forth movement of the thrombus removal inner tube with the opening and closing of the valve, thereby achieving safe and effective removal of the thrombus. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the distal end of the embolectomy catheter of the present invention. Figure 1 ;

[0021] Figure 2 This is a schematic diagram of the distal end of the embolectomy catheter of the present invention. Figure 2 ;

[0022] Figure 3 This is a schematic diagram of the overall structure of the thrombus removal catheter of the present invention;

[0023] Figure 4 This is a distal end view of the embolectomy catheter of the present invention when the valve is closed;

[0024] Figure 5 Schematic diagram of the overall structure of some other embodiments of the embolic aspiration catheter of the present invention.

[0025] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0026] 1. Outer tube; 2. Thrombectomy inner tube; 3. Protective sleeve; 11. Connector; 12. Traction wire; 13. Valve; 14. Retraction knob; 21. Negative pressure connector; 111. Positive pressure interface. DETAILED DESCRIPTION

[0027] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0028] Example: Figure 1 、 2 As shown in Figures 3 and 4, the thrombus removal catheter of this embodiment includes an outer tube 1 and an inner thrombus removal tube 2. The distal end of the outer tube 1 is provided with a plurality of fan-shaped and elastic valves 13 along its circumference. The inner thrombus removal tube 2 passes through the inner cavity of the outer tube 1. The distal end of the inner thrombus removal tube 2 can pass through or retract from the distal end of the outer tube 1. When the distal end of the inner thrombus removal tube 2 passes through the distal end of the outer tube 1, the valve 13 is pushed outward to open and deformed. When the distal end of the inner thrombus removal tube 2 retracts to the distal end of the outer tube 1, the valve 13 returns to its initial state and blocks the distal port of the outer tube 1.

[0029] Before thrombus removal, the distal end of the outer tube 1 is sent along the blood vessel into the vascular lesion (thrombus) in the patient's body, and the distal end of the outer tube 1 is close to the thrombus. When removing the thrombus, the proximal end of the thrombus removal inner tube 2 is connected to the negative pressure device, and the thrombus removal inner tube 2 is operated to repeatedly enter and exit the distal end port of the outer tube 1 along the long axis direction. When the distal end of the thrombus removal inner tube 2 passes through the distal end port of the outer tube 1, the valve 13 is squeezed outward. After the thrombus is absorbed by the thrombus removal inner tube 2, it is retracted into the outer tube 1 until the distal end of the thrombus removal inner tube 2 is retracted into the outer tube 1. After entering the distal port, the valve 13 returns to its initial state under its elastic action. During this process, the valve 13 will cut the thrombus sucked by the distal end of the thrombus removal inner tube 2 and block the distal port of the outer tube 1. Next, the distal end of the thrombus removal inner tube 2 is repeatedly moved in and out of the distal end of the outer tube 1, and the valve 13 is repeatedly opened or closed, thereby repeatedly cutting the thrombus. The cut small pieces of thrombus will be extracted from the proximal end of the thrombus removal inner tube 2 under the action of negative pressure until the thrombus is completely sucked out. The structural design is simple and reasonable. The thrombus can be cut and cut during the thrombus removal process by coordinating the back and forth movement of the thrombus removal inner tube with the opening and closing of the valve, thereby achieving safe and effective thrombus removal and avoiding the situation where large pieces of thrombus easily block the distal end or the interior of the thrombus removal inner tube without separation, resulting in interruption of thrombus removal.

[0030] In this embodiment, Figure 1 and 2 As shown, the distal end of the outer tube 1 is covered with a protective sleeve 3. The end of the protective sleeve 3 is at a certain distance from the distal end of the outer tube 1, so that the valve 13 will not be exposed outside the protective sleeve 3 during the deformation and displacement caused by the thrombus removal inner tube 2.

[0031] As a preferred embodiment, a joint 11 is provided at the proximal end of the outer tube 1 , and the proximal end of the thrombus removal inner tube 2 is sealed and passes through the joint 11 .

[0032] In the above embodiment, the design of the connector 11 ensures good sealing between the proximal ends of the outer tube 1 and the thrombus removal inner tube 2, thus preventing leakage.

[0033] In this embodiment, a negative pressure connector 21 is connected to the proximal end of the thrombus removal inner tube 2. This connector 21 is connected to a negative pressure monitor. This connector 21 utilizes a conventional commercially available product, compatible with the model of the negative pressure device, enabling optimal access to negative pressure. The negative pressure monitor at this connector 21 monitors the negative pressure in real time, allowing the physician to adjust the negative pressure to a safe level and facilitating effective thrombus removal.

[0034] The negative pressure monitor can be a pressure sensor that is already available on the market for monitoring negative pressure, or other conventional instruments.

[0035] As a preferred embodiment, the connector 11 is connected to a positive pressure interface 111 communicating with its inner cavity.

[0036] In the above-mentioned embodiment, the positive pressure interface 111 is designed to be connected to a positive pressure device. Gas or liquid is injected into the outer tube 1 through the positive pressure interface 111, and the interior of the distal port of the outer tube 1 can be flushed. In addition, in conjunction with the negative pressure suction of the thrombus removal inner tube 2, a boost is formed for the negative pressure suction, so that the suction force is enhanced, which can further enhance the performance of thrombus suction, ensure that the thrombus suction process is smoother and faster, and further reduce the probability of blockage of the thrombus removal inner tube 2.

[0037] In this embodiment, the above-mentioned connector 11 is a Y-shaped connector. The proximal end of the above-mentioned thrombus removal inner tube 2 passes through one interface of the above-mentioned connector 11, and the other interface of the above-mentioned connector 11 constitutes the above-mentioned positive pressure interface 111. A positive pressure gap is formed between the above-mentioned outer tube 1 and the above-mentioned thrombus removal inner tube 2.

[0038] As a preferred embodiment, Figure 5 As shown, a traction cavity is provided inside one side of the side wall of the outer tube 1 along its length direction, and a traction wire 12 is provided in the traction cavity. One end of the traction wire 12 is connected and fixed to the distal end of the outer tube 1, and the other end passes through the proximal side wall of the outer tube 1.

[0039] In the above embodiment, the traction wire 12 is pulled at the proximal end of the outer tube 1 so that the distal end of the outer tube 1 receives traction force, thereby adjusting the bending of the distal end of the outer tube 1. In particular, when the outer tube 1 enters a blood vessel, the bending amplitude of the distal end of the outer tube 1 can be adjusted to allow the outer tube 1 to smoothly enter a curved or bifurcated blood vessel.

[0040] In this embodiment, a take-up knob 14 is provided at the proximal end of the outer tube 1, and the other end of the traction wire 12 is wound around the take-up knob 14. The take-up knob 14 is connected to the proximal end of the outer tube 1 via a shaft, and the traction wire 12 is wound around the shaft. The take-up or pay-out operation is performed as the shaft rotates, which is very simple to operate.

[0041] In this embodiment, the outer tube 1 is made of medical-grade polyurethane, polyvinyl chloride or polyethylene pipe.

[0042] In this embodiment, the surface of the thrombectomy inner tube 2 is coated with an SPFA lubricating, hydrophobic, and anti-stick coating. This SPFA lubricating, hydrophobic, and anti-stick coating provides both hydrophobic lubrication and blood-blocking properties. This enhances the passage of blood clots and reduces the likelihood of blood clots becoming lodged within the thrombectomy inner tube 2.

[0043] In this embodiment, a length scale line may be provided on the surface of the outer tube 1 along the length direction to facilitate the doctor to judge the length of the outer tube 1 inserted into the body.

[0044] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0045] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0046] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0047] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0048] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0049] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A thrombectomy catheter, characterized by: The invention comprises an outer tube (1) and an inner thrombectomy tube (2), wherein the distal end of the outer tube (1) is provided with a plurality of fan-shaped elastic valves (13) along its circumference, and the inner thrombectomy tube (2) passes through the inner cavity of the outer tube (1). The distal end of the inner thrombectomy tube (2) can pass through or retract from the distal end of the outer tube (1), and when the distal end of the inner thrombectomy tube (2) passes through the distal end of the outer tube (1), the valve (13) is pushed outward to open and deformed. When the distal end of the inner thrombectomy tube (2) retracts into the distal end of the outer tube (1), the valve (13) returns to its initial state and blocks the distal port of the outer tube (1).

2. The embolectomy catheter according to claim 1, characterized in that: The distal end of the outer tube (1) is provided with a protective sleeve (3).

3. The embolectomy catheter according to claim 1, characterized in that: The proximal end of the outer tube (1) is provided with a joint (11), and the proximal end of the thrombus removal inner tube (2) is sealed and passes through the joint (11).

4. The embolectomy catheter according to claim 3, characterized in that: The proximal end of the thrombus removal inner tube (2) is connected to a negative pressure connector (21), and the negative pressure connector (21) is connected to a negative pressure monitor.

5. The embolectomy catheter according to claim 3, characterized in that: The connector (11) is connected to a positive pressure interface (111) that communicates with its inner cavity.

6. The embolectomy catheter according to claim 5, characterized in that: The connector (11) is a Y-shaped connector, the proximal end of the thrombus removal inner tube (2) passes through one interface of the connector (11), and the other interface of the connector (11) constitutes the positive pressure interface (111), forming a positive pressure gap between the outer tube (1) and the thrombus removal inner tube (2).

7. The embolectomy catheter according to claim 1, characterized in that: A traction cavity is provided inside one side of the side wall of the outer tube (1) along its length direction, and a traction wire (12) is provided in the traction cavity. One end of the traction wire (12) is connected and fixed to the distal end of the outer tube (1), and the other end passes through the proximal side wall of the outer tube (1).

8. The embolectomy catheter according to claim 7, characterized in that: The proximal end of the outer tube (1) is provided with a wire-taking knob (14), and the other end of the traction wire (12) is wound around the wire-taking knob (14).

9. The embolectomy catheter according to any one of claims 1 to 8, characterized in that: The outer tube (1) is a polyurethane, polyvinyl chloride or polyethylene pipe.

10. The embolectomy catheter according to claim 9, characterized in that: The surface of the thrombus removal inner tube (2) is provided with an SPFA lubricating, hydrophobic, and anti-stick coating.

Images