Vascular thrombectomy device

Abstract

The utility model discloses a kind of vascular intraluminal thrombus retrieval devices, it is related to medical instrument technical field, main purpose is to remove thrombus in blood vessel efficiently.The main technical scheme of the utility model is as follows: vascular intraluminal thrombus retrieval device, the device includes: outer catheter, sleeve, inner catheter and intercepting part;The sleeve is slidably arranged in the outer catheter;The inner catheter is slidably arranged in the sleeve, and the inner catheter is slidably sleeved with guide wire;The intercepting part includes filter screen, sliding block, pull wire and multiple connecting wires, the filter screen is conical, the tip of the filter screen is fixedly connected to one end of the inner catheter in blood vessel, the sliding block is slidably connected to the shaft side of the inner catheter, one end of each of the connecting wires is connected to the open end edge of the filter screen, the other end is connected to the sliding block, one end of the pull wire is connected to the sliding block, and the other end is axially through the sleeve.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to an endovascular thrombectomy device. Background Technology

[0002] Intravascular thrombosis is a common and frequently occurring disease in clinical practice. The main treatments for this disease are thrombolysis with drugs and mechanical thrombectomy.

[0003] Thrombolytic therapy involves injecting thrombolytic agents into the vicinity of the lesion within the blood vessel where the disease is located. This creates a high concentration of thrombolytic agents locally, accelerating the dissolution of the thrombus and increasing the chances of vascular recanalization. However, because the therapeutic window for thrombolytic therapy is relatively short, and it is only suitable for small thrombi, its effectiveness in treating large thromboembolic events is not ideal. Therefore, ultimately only about 3-5% of patients are suitable candidates for thrombolytic therapy.

[0004] Mechanical thrombectomy involves delivering a thrombectomy device to the lesion site and then removing the thrombus through a sheath. Mechanical thrombectomy includes the following methods: thrombectomy, which removes the thrombus more thoroughly but causes significant damage to the vessel wall, easily leading to various inflammatory complications; laser thrombectomy, which is difficult to perform, as low laser energy is ineffective and high energy damages the vessel, and also easily causes various complications; and thrombectomy using a capture device, which is simple to perform and causes minimal damage to the vessel wall, but often fails to capture the blood clot.

[0005] Furthermore, even with current thrombectomy devices, thrombi may still remain in the blood vessels after a single thrombectomy procedure, and the thrombus clearance rate in a single thrombectomy operation needs to be improved. Utility Model Content

[0006] In view of this, the present invention provides an endovascular thrombectomy device, the main purpose of which is to improve the clearance rate of thrombi in blood vessels.

[0007] To achieve the above objectives, this utility model mainly provides the following technical solutions:

[0008] This invention provides an endovascular thrombectomy device, which includes: an external catheter, a sheath, an internal catheter, and an interception part;

[0009] The sleeve is slidably disposed within the external conduit;

[0010] The inner catheter is slidably disposed within the cannula, and the inner catheter is slidably sleeved onto the guidewire;

[0011] The interception section includes a filter screen, a slider, a pull wire, and multiple connecting wires. The filter screen is cone-shaped, and the tip of the filter screen is fixedly connected to one end of the inner catheter located inside the blood vessel. The slider is slidably connected to the axial side of the inner catheter. One end of each connecting wire is connected to the edge of the opening end of the filter screen, and the other end is connected to the slider. One end of the pull wire is connected to the slider, and the other end passes axially through the cannula.

[0012] The purpose of this utility model and the technical problems to be solved can be further achieved by the following technical measures.

[0013] Optionally, a locking clip is also included, which clamps the end of the cannula located outside the blood vessel to fix the relative position of the cannula and the inner catheter.

[0014] Optionally, it may also include development marks located at the tip of the filter.

[0015] Optionally, the connecting wire is composed of memory steel wire, with one end of the connecting wire hinged to the edge of the opening end of the filter screen and the other end hinged to the slider.

[0016] By employing the above technical solution, this utility model has at least the following advantages:

[0017] When thrombectomy is required, the guidewire is inserted through the artery into the distal end of the target thrombus (the end of the thrombus furthest from the puncture site is considered the distal end). The external catheter, following the guidewire, also reaches the thrombus. The cannula and the inner catheter encased within it are then moved along the guidewire to the distal end of the thrombus (the filter at the end of the inner catheter is encased within the cannula, keeping the open end of the filter in a constricted state to facilitate its smooth arrival at the distal end of the thrombus). The cannula is then withdrawn, exposing the filter, connecting wire, and slider within the vessel lumen. At this point, the slider slides slightly distally along the inner catheter, causing the filter to open into an umbrella shape. The operator then simultaneously withdraws the cannula and inner catheter, allowing the opened filter to catch the thrombus and move it proximally, ultimately collecting the thrombus into the external catheter.

[0018] At this point, pulling the cable causes the slider to slide towards the proximal end, which in turn causes the connecting ribbon to contract at the opening of the filter, thereby completely squeezing the thrombus inside the filter into the external catheter.

[0019] Then, the cannula and inner catheter are moved toward the distal end of the thrombus again, and then the cannula and inner catheter are withdrawn at the same time. The opened filter screen catches the thrombus again and moves it toward the proximal end, which once again carries the remaining thrombus into the outer catheter.

[0020] Repeat the above steps until the blood clot in the blood vessel is completely removed. Attached Figure Description

[0021] Figure 1A diagram illustrating the state of the filter of an endovascular thrombectomy device as it moves toward the distal end of the thrombus, provided in an embodiment of this utility model.

[0022] Figure 2 This is a diagram showing the state of a thrombectomy device for intravascular lumen removal as the filter moves toward the external catheter (to remove the thrombus), according to an embodiment of this utility model.

[0023] The reference numerals in the accompanying drawings include: external catheter 1, cannula 2, internal catheter 3, guidewire 4, filter screen 5, slider 6, pull wire 7, connecting wire 8, locking clip 9, and imaging mark 10. Detailed Implementation

[0024] To further illustrate the technical means and effects adopted by this utility model to achieve its intended purpose, the specific implementation methods, structures, features, and effects according to this utility model application are described in detail below with reference to the accompanying drawings and preferred embodiments. In the following description, different "embodiments" or "embodiments" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0026] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides an endovascular thrombectomy device, which includes: an external catheter 1, a sheath 2, an internal catheter 3, and an interception part;

[0027] The sleeve 2 is slidably disposed inside the outer conduit 1;

[0028] The inner catheter 3 is slidably disposed inside the sheath 2, and the inner catheter 3 is slidably sleeved on the guide wire 4;

[0029] The interception section includes a filter screen 5, a slider 6, a pull wire 7, and multiple connecting wires 8. The filter screen 5 is conical, and the tip of the filter screen 5 is fixedly connected to one end of the inner catheter 3 located inside the blood vessel. The slider 6 is slidably connected to the axial side of the inner catheter 3. One end of each connecting wire 8 is connected to the edge of the opening end of the filter screen 5, and the other end is connected to the slider 6. One end of the pull wire 7 is connected to the slider 6, and the other end passes axially through the cannula 2.

[0030] The working process of the endovascular thrombectomy device is as follows:

[0031] When thrombectomy is required, the guidewire 4 enters the distal end of the target thrombus through the artery (the end of the thrombus furthest from the puncture site is considered the distal end). The external catheter 1, following the path of the guidewire 4, also reaches the thrombus. Then, the cannula 2 and the inner catheter 3 encased within it are moved along the guidewire 4 to the distal end of the thrombus (the filter 5 at the end of the inner catheter 3 is encased in the cannula 2, and the open end of the filter 5 is in a contracted state to facilitate the filter 5 reaching the distal end of the thrombus). The cannula 2 is then withdrawn, exposing the filter 5, connecting wire 8, and slider 6 within the vascular lumen. At this time, the slider 6 slides distally along the inner catheter 3, and the filter 5 opens into an umbrella shape. Then, the operator simultaneously withdraws the cannula 2 and the inner catheter 3. The opened filter 5 catches the thrombus and moves proximally, ultimately collecting the thrombus into the external catheter 1.

[0032] At this point, pulling the pull wire 7 causes the slider 6 to slide towards the proximal end, and the connecting wire 8 causes the opening end of the filter 5 to contract, thereby completely squeezing the thrombus in the filter 5 into the external catheter 1.

[0033] Then, the cannula 2 and the inner catheter 3 are moved toward the distal end of the thrombus again, and then the cannula 2 and the inner catheter 3 are withdrawn at the same time. The opened filter 5 catches the thrombus again and moves it toward the proximal end, and once again carries the remaining thrombus into the outer catheter 1.

[0034] Repeat the above steps until the blood clot in the blood vessel is completely removed.

[0035] In the technical solution of this utility model, during the above process, the opening and contraction of the filter 5 can be controlled manually, which facilitates repeated collection of thrombi in local areas of blood vessels and improves the clearance rate of thrombi in blood vessels. Moreover, when the filter 5 collects thrombi, the thrombi are directly collected by the filter 5 into the external catheter 1. The thrombi that gradually accumulate in the external catheter 1 expands to the surrounding area, and the tension force formed on the wall of the external catheter 1 is not easily transmitted to the blood vessel wall (the wall of the external catheter 1 shields the tension force), thus avoiding damage to the blood vessel wall.

[0036] like Figure 1 and Figure 2 As shown, in a specific embodiment, a locking clip 9 is also included. The locking clip 9 is clamped on the end of the cannula 2 located outside the blood vessel and is used to fix the relative position of the cannula 2 and the inner catheter 3.

[0037] In this embodiment, specifically, during the process of the cannula 2 and the inner catheter 3 encased therein moving along the guidewire 4 to the distal end of the thrombus, the locking clip 9 clamps the end side of the cannula 2, and the inner wall of the cannula 2 and the outer wall of the inner catheter 3 are pressed tightly against each other to ensure that the cannula 2 and the inner catheter 3 can move synchronously without relative displacement, thus preventing the filter 5 from prematurely escaping the cannula 2 and preventing the filter 5 from opening before it has fully reached the distal end of the thrombus.

[0038] During the process of the operator simultaneously retracting the sleeve 2 and the inner conduit 3, the locking clamp 9 is clamped on the end side of the sleeve 2, and the inner wall of the sleeve 2 and the outer wall of the inner conduit 3 are pressed tightly against each other without relative displacement, ensuring that the sleeve 2 and the inner conduit 3 can move synchronously, avoiding the end of the sleeve 2 from contacting the connecting wire 8 when the filter screen 5 is opened, and avoiding the bending and damage of the connecting wire 8.

[0039] like Figure 1 and Figure 2 As shown, in a specific embodiment, a developing mark 10 is also included, which is located at the tip of the filter 5.

[0040] In this embodiment, specifically, the imaging marker 10 facilitates imaging of the filter 5 during the operation, making it easier for the doctor to operate and observe during the operation.

[0041] In a specific embodiment, the material of the developing mark 10 is an adhesive containing a developer or a platinum-iridium alloy containing a developer.

[0042] In a specific embodiment, the material of the external conduit 1 is polyetheramide elastomer.

[0043] In a specific embodiment, the filter screen 5 is made of nylon thread.

[0044] In a specific embodiment, the connecting wire 8 is composed of memory steel wire, one end of the connecting wire 8 is hinged to the edge of the opening end of the filter screen 5, and the other end is hinged to the slider 6.

[0045] In this embodiment, the two ends of the connecting wire 8 are respectively hinged to the filter screen 5 and the slider 6, so that the connecting wire 8 can rotate adaptively during the process of the filter screen 5 opening or closing.

[0046] In a specific embodiment, the sleeve 2 is made of polyvinyl chloride.

[0047] In a specific embodiment, the guide wire 4 is made of nickel-titanium alloy.

[0048] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. An endovascular thrombectomy device, characterized in that, include: External catheter; A cannula, which is slidably disposed within the outer conduit; An inner catheter is slidably disposed within the cannula and slidably sleeved onto a guidewire. The interception section includes a filter screen, a slider, a pull wire, and multiple connecting wires. The filter screen is cone-shaped, and its tip is fixedly connected to one end of the inner catheter located inside the blood vessel. The slider is slidably connected to the axial side of the inner catheter. One end of each connecting wire is connected to the edge of the opening end of the filter screen, and the other end is connected to the slider. One end of the pull wire is connected to the slider, and the other end passes axially through the cannula.

2. The endovascular thrombectomy device according to claim 1, characterized in that, It also includes a locking clip, which clamps the end of the cannula located outside the blood vessel to fix the relative position of the cannula and the inner catheter.

3. The endovascular thrombectomy device according to claim 1, characterized in that, It also includes a developing mark located at the tip of the filter.

4. The endovascular thrombectomy device according to claim 1, characterized in that, The connecting wire is made of memory steel wire, with one end of the connecting wire hinged to the edge of the opening end of the filter screen and the other end hinged to the slider.

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