A thrombus filter device

Abstract

This application discloses a thrombus filtration device, including a catheter, a guidewire, and a filter. The filter is fixedly disposed at the distal end of the guidewire by welding, bonding, or other methods, and has filter mesh for capturing thrombi. The guidewire and filter are movably inserted into the lumen of the catheter to enter or exit the blood vessel through the catheter. This thrombus filtration device, by fixing the filter at the distal end of the guidewire, allows for simultaneous delivery and removal of the guidewire and filter into the blood vessel, simplifying the surgical procedure, shortening the surgical time, and improving the safety of the procedure.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and more specifically, to a thrombus filtration device. Background Technology

[0002] When treating vascular stenosis using interventional methods, thrombi or tissue fragments often detach at the stenosis site. These detached fragments can easily cause embolism in distal small blood vessels or tissues, increasing the risk of surgical complications. Therefore, thrombus filtration devices are needed to capture the thrombi. However, existing thrombus filtration devices have cumbersome operating procedures, which undoubtedly increases the difficulty and risk of the procedure. Therefore, simplifying the use of thrombus filtration devices has become a pressing technical problem for those skilled in the art. Utility Model Content

[0003] In view of this, the purpose of this application is to provide a thrombus filtration device to simplify the use of the thrombus filtration device and thereby improve the safety of the operation.

[0004] To achieve the above objectives, this application provides the following technical solution:

[0005] A thrombus filtration device includes a catheter, a guidewire, and a filter. The filter is fixedly disposed at the distal end of the guidewire and has filter mesh for capturing thrombi. The guidewire and the filter are movably inserted into the lumen of the catheter to enter or exit a blood vessel.

[0006] Optionally, in the above-mentioned thrombus filtration device, the filter mesh located near the filter is a first mesh, and the mesh located at the far end of the filter is a second mesh, wherein the opening area of ​​the first mesh is larger than the opening area of ​​the second mesh.

[0007] When the filter is operating within a blood vessel, the first mesh allows thrombi and blood to enter the filter, while the second mesh filters the blood and intercepts the thrombi.

[0008] Optionally, in the above-described thrombus filtration device, the filter has a transport state and an operating state, and the filter includes:

[0009] A proximal collar is fixedly disposed at the distal end of the guidewire;

[0010] The distal ferrule is slidably disposed on the guidewire and disposed at the distal end of the proximal ferrule;

[0011] The filter body is provided with the filter mesh, and both ends of the filter body are respectively connected to the proximal collar and the distal collar;

[0012] Specifically, when the filter is inside the conduit, the filter is in the transport state, and the proximal collar and the distal collar are spaced apart by a first distance. When the filter is outside the conduit, the filter is in the working state, and the proximal collar and the distal collar are spaced apart by a second distance, wherein the first distance is greater than the second distance.

[0013] Optionally, in the above-described thrombus filtration device, the filter body includes:

[0014] The first filter wire consists of multiple circumferentially arranged around the guide wire, with both ends connected to the proximal collar and the distal collar, respectively.

[0015] A retaining ring is fitted onto the guide wire and positioned between the proximal collar and the distal collar, and is connected to the first filter wire;

[0016] The second filter wire consists of a plurality of circumferentially arranged around the guide wire, with one end of the second filter wire connected to the fixing ring and the other end connected to the distal collar.

[0017] Optionally, in the above-described thrombus filtration device, the first filter wire comprises:

[0018] The first fishing section, the proximal end of the first fishing section is connected to the proximal end collar;

[0019] The first interception section has its proximal end connected to the distal end of the first fishing section, the distal end of the first interception section is connected to the distal end collar, and the fixing ring is connected to the proximal end of the first interception section.

[0020] Specifically, when the filter is operating within the blood vessel, the distance between the first catching segment and the guidewire gradually increases along the direction from the proximal end to the distal end of the guidewire, while the distance between the first intercepting segment and the guidewire gradually decreases.

[0021] Optionally, in the above-described thrombus filtration device, the filter body includes:

[0022] The third filter wire consists of multiple wires arranged circumferentially around the guide wire, with both ends connected to the proximal collar and the distal collar, respectively.

[0023] There are multiple fourth filter wires connected between two adjacent third filter wires, and the distance between the fourth filter wire and the proximal collar is greater than the distance between the fourth filter wire and the distal collar.

[0024] Optionally, in the above-described thrombus filtration device, the third filter wire includes:

[0025] The second fishing section, the proximal end of which is connected to the proximal end collar;

[0026] The second interception section, the proximal end of the second interception section is connected to the distal end of the second fishing section, the distal end of the second interception section is connected to the distal end loop, and the two ends of the fourth filter wire are respectively connected to the second interception sections of the two adjacent third filter wires;

[0027] Specifically, when the filter is operating within the blood vessel, the distance between the second catching segment and the guidewire gradually increases along the direction from the proximal end to the distal end of the guidewire, while the distance between the second intercepting segment and the guidewire gradually decreases.

[0028] Optionally, in the above-mentioned thrombus filtration device, the filter body includes a mesh bag and a frame, both the frame and the mesh bag are disposed at the distal end of the guide wire, and the frame is connected to the mesh bag, and the mesh bag is provided with the filter mesh.

[0029] In the case where the filter is operating within a blood vessel, the skeleton expands the mesh.

[0030] Optionally, in the above-described thrombus filtration device, the proximal collar and / or the distal collar are made of a radiopaque material;

[0031] And / or, the guidewire is provided with a imaging device, and the imaging device is disposed between the proximal collar and the distal collar.

[0032] Optionally, the thrombus filtration device described above also includes a suction device connected to the proximal end of the catheter for providing negative pressure into the catheter.

[0033] The thrombus filtration device provided in this application includes a catheter, a guidewire, and a filter. The filter is fixedly installed at the distal end of the guidewire by means of welding, bonding, etc., and is provided with filter mesh for capturing thrombi. The guidewire and the filter are movably inserted into the lumen of the catheter to enter or exit the blood vessel through the catheter. During the surgical preparation phase, the filter and guidewire are first placed inside the catheter lumen. During the vascular stenosis dilation procedure, the filter is advanced through the catheter through the narrowed lesion area to a distal position within the stenosis. The catheter is then withdrawn, allowing the filter to be released from the catheter and exposed to the blood vessel. Next, the necessary medical instruments for the vascular stenosis dilation procedure are delivered to the lesion site via the guidewire for dilation treatment. During the procedure, the filter intercepts and collects any thrombi that detach from the lesion site, while allowing unobstructed blood to continue flowing through its mesh. After the procedure, the medical instruments used for dilation treatment are withdrawn, and the catheter is advanced again along the guidewire to a position near the filter. When the procedure is complete and the thrombus filter needs to be removed, the filter and the captured thrombus are retrieved into the catheter lumen by pulling the guidewire proximally or advancing the catheter distally. Finally, the filter and captured thrombus can be safely removed from the patient along with the guidewire.

[0034] Compared to related technologies, the thrombus filtration device provided in this application simplifies the surgical procedure, shortens the surgical time, and improves the safety of the operation by fixing the filter to the distal end of the guidewire. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is an isometric view of the thrombus filtering device disclosed in the embodiments of this application in its first state;

[0037] Figure 2 This is a top view of the thrombus filtering device disclosed in the embodiments of this application in its first state;

[0038] Figure 3 This is a front view of the thrombus filtering device disclosed in the embodiments of this application in its first state;

[0039] Figure 4 for Figure 3 Cross-sectional view at point AA;

[0040] Figure 5for Figure 4 A magnified view of a section at point M;

[0041] Figure 6 for Figure 4 A magnified view of a portion of point N in the middle;

[0042] Figure 7 This is a front view of the thrombus filtering device disclosed in the embodiments of this application in its second state;

[0043] Figure 8 for Figure 7 Cross-sectional view at point BB;

[0044] Figure 9 for Figure 8 A magnified view of a section at point P in the middle;

[0045] Figure 10 This is a schematic diagram of the first type of filter disclosed in the embodiments of this application in its deployed state;

[0046] Figure 11 This is a schematic diagram of the second type of filter disclosed in the embodiments of this application in its deployed state.

[0047] Among them, 100 is the guide wire, 200 is the filter, 210 is the first filter wire, 2101 is the first fishing section, 2102 is the first interception section, 211 is the second filter wire, 212 is the fixing ring, 213 is the third filter wire, 2131 is the second fishing section, 2132 is the second interception section, 214 is the fourth filter wire, 220 is the proximal collar, 230 is the distal collar, 240 is the first mesh, 241 is the second mesh, 300 is the guide tube, 400 is the guide tube seat, 401 is the first interface, 402 is the second interface, 403 is the third interface, and 500 is the suction device. Detailed Implementation

[0048] The core of this application is to disclose a thrombus filtration device to simplify the use of the thrombus filtration device and thereby improve the safety of the procedure.

[0049] Hereinafter, embodiments will be described with reference to the accompanying drawings. Furthermore, the embodiments shown below do not limit the scope of the utility model as described in the claims. Additionally, the complete contents of the structures represented in the embodiments below are not limited to those necessary for the solution of the utility model as described in the claims. It should be noted that, for ease of description, only the parts relevant to the utility model are shown in the drawings. Unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0050] It should be noted that in this article, "proximal" and "distal" refer to the distance from the operator. The end closer to the operator is called the "proximal" end, and the end farther from the operator is called the "distal" end.

[0051] Combination Figure 1 and Figure 2 The thrombus filtration device disclosed in this application includes a catheter 300, a guidewire 100, and a filter 200. The filter 200 is fixedly disposed at the distal end of the guidewire 100 by means of welding, bonding, etc., and is provided with a filter mesh for capturing thrombi. The guidewire 100 and the filter 200 are movably inserted into the inner lumen of the catheter 300 so as to enter or exit the blood vessel through the catheter 300.

[0052] Combination Figures 8-9 During the surgical preparation phase, the filter 200 and guidewire 100 are first placed together in the lumen of catheter 300. During the vascular stenosis dilation procedure, the filter 200 is passed through the stenotic lesion area of ​​the blood vessel via catheter 300 and advanced to a distal position within the stenotic lesion area. Subsequently, combined with… Figure 3 and Figure 4 The catheter 300 is withdrawn, allowing the filter 200 to be released from inside the catheter 300 and exposed to the blood vessel. Next, the medical instruments required for the vasodilation procedure are delivered to the lesion site via the guidewire 100 to perform the dilation treatment. During the procedure, the filter 200 intercepts and collects any thrombi that detach from the lesion site, while allowing unobstructed blood to continue flowing through its filter mesh. After the procedure, the medical instruments used for dilation treatment are withdrawn, and the catheter 300 is advanced again along the guidewire 100 to a position near the filter 200. When the procedure is complete and the thrombus filter needs to be removed, the filter 200 and the captured thrombus are retrieved into the lumen of the catheter 300 by pulling the guidewire 100 proximally or advancing the catheter 300 distally. Finally, the filter 200 and the captured thrombus can be safely withdrawn from the patient along with the guidewire 100.

[0053] Compared to related technologies where the guidewire 100 is first inserted into the body and then the filter 200 is delivered through the guidewire 100, the thrombus filtration device disclosed in this application fixes the filter 200 to the distal end of the guidewire 100, allowing the guidewire 100 and the filter 200 to be delivered and withdrawn into the blood vessel simultaneously. This simplifies the surgical procedure, shortens the surgical time, and improves the safety of the surgery.

[0054] It should be noted that during the actual surgical procedure, the filter 200 is positioned distal to the narrowed lesion, meaning the proximal end of the filter 200 is closer to the site where the thrombus has dislodged. Therefore, in some embodiments disclosed in this application, combined with... Figure 10 and Figure 11The filter mesh located near the proximal end of the filter 200 is defined as the first mesh 240, and the mesh located at the distal end of the filter 200 is defined as the second mesh 241. The opening area of ​​the first mesh 240 is larger than the opening area of ​​the second mesh 241. This allows the first mesh 240 to allow thrombi to enter the filter 200 when the filter 200 is operating within a blood vessel, while the second mesh 241 filters the blood and intercepts the thrombi. In this application, "when the filter 200 is operating within a blood vessel" refers to the filter 200 being located outside the catheter 300 and in a working state where it intercepts thrombi within the blood vessel.

[0055] For example, the filter 200 can be an ellipsoidal structure made of multiple metal wires, wherein the metal wires at the proximal end of the filter 200 are sparse and the metal wires at the distal end are dense. This structure facilitates the entry of thrombi into the filter 200 and prevents thrombi that have entered the filter 200 from escaping from the filter 200. In addition, it also facilitates the suction of thrombi in the filter 200 into the catheter 300 by negative pressure.

[0056] Specifically, to facilitate the transportation of the filter 200, the filter 200 has a transportation state and an operating state, combined with... Figures 8-9 With the filter 200 inside the conduit 300, the filter 200 is in a transport state, and its radial dimension is small, allowing it to move easily within the conduit 300; combined with Figure 3 and Figure 4 When the filter 200 is outside the catheter 300, the filter 200 is in working condition. It has a large radial dimension and can effectively intercept thrombi in blood vessels.

[0057] In some embodiments disclosed in this application, combined with Figure 10 and Figure 11The filter 200 includes a proximal collar 220, a distal collar 230, and a filter body. The filter body is provided with the aforementioned filter mesh, which plays the main role in capturing thrombi. The two ends of the filter body are connected to the proximal collar 220 and the distal collar 230, respectively. The proximal collar 220 is fixedly disposed at the distal end of the guidewire 100, and the distal collar 230 is slidably disposed on the guidewire 100 and disposed at the distal end of the proximal collar 220. This facilitates the switching of the filter 200 between the transport state and the working state by sliding the distal collar 230 on the guidewire 100. Since the proximal collar 220 is fixed and the distal collar 230 is movable, it will not affect the retrieval of the filter 200 by the catheter 300. When the filter 200 is inside the conduit 300, the filter 200 is in a transport state, and the proximal collar 220 and the distal collar 230 are separated by a first distance. When the filter 200 is outside the conduit 300, the filter 200 is in a working state, and the proximal collar 220 and the distal collar 230 are separated by a second distance. The first distance is greater than the second distance, so that the switching between the transport state and the working state can be achieved by stretching and shortening the filter body axially.

[0058] The filter body can be bonded to the proximal collar 220 and distal collar 230 using instant adhesive or UV-curable adhesive, or connected by welding, pinning, or other methods. The filter body can be made of shape memory alloys such as nickel-titanium or other elastic materials. Nickel-titanium alloys possess excellent shape memory properties, ensuring the filter 200's bending ability. During insertion or removal of the filter 200 from the blood vessel, the filter 200 moves within the catheter 300, with the filter body in a transport state attached to the outer wall of the guidewire 100. When the filter 200 extends beyond the catheter 300, it automatically deforms and unfolds, filtering blood clots. The proximal collar 220 and distal collar 230 can be made of medical-grade silicone or other biocompatible materials; this embodiment does not limit the specific materials used.

[0059] In order to form a filter mesh structure that is sparse at the near end and dense at the far end, combined with Figure 5 and Figure 10In some embodiments, the filter body includes a first filter wire 210, a fixing ring 212, and a second filter wire 211. Multiple first filter wires 210 are arranged circumferentially around the guide wire 100, and both ends of the first filter wire 210 are connected to a proximal collar 220 and a distal collar 230, respectively. The fixing ring 212 is fitted onto the guide wire 100 and positioned between the proximal collar 220 and the distal collar 230, and is connected to the first filter wire 210. Multiple second filter wires 211 are arranged circumferentially around the guide wire 100, with one end of the second filter wire 211 connected to the fixing ring 212 and the other end connected to the distal collar 230. The first filter wire 210, fixing ring 212, and second filter wire 211 cooperate to form multiple filter mesh openings. In this embodiment, the arrangement of the second filter wire 211 makes the filter mesh openings at the distal end of the filter 200 more dense, thereby effectively intercepting thrombi. The retaining ring 212 can be one or multiple rings spaced apart along the axial direction of the guide wire 100. When there are multiple rings, the retaining ring 212 can increase the density of the filter mesh.

[0060] To ensure a uniform filtration effect in the thrombus filtration device, multiple first filter wires 210 are evenly arranged around the guide wire 100 in the circumferential direction. That is, the angle between any two adjacent first filter wires 210 in the circumferential direction is 360° / n, where n is the number of first filter wires 210 and n is an integer not less than 2. Second filter wires 211 can also be evenly arranged around the guide wire 100 in the circumferential direction and spaced apart between adjacent first filter wires 210. This application embodiment does not impose any restrictions on this.

[0061] In a further embodiment, combined with Figure 10 The first filter wire 210 includes a first catching section 2101 and a first intercepting section 2102. The proximal end of the first catching section 2101 is connected to a proximal collar 220, and the proximal end of the first intercepting section 2102 is connected to the distal end of the first catching section 2101. The distal end of the first intercepting section 2102 is connected to a distal collar 230, and a fixing ring 212 is connected to the proximal end of the first intercepting section 2102. When the filter 200 is operating within the blood vessel, the distance between the first catching section 2101 and the guidewire 100 gradually increases along the proximal to distal direction, while the distance between the first intercepting section 2102 and the guidewire 100 gradually decreases, forming an ellipsoidal filter body. Thrombi enter the filter body through the filter mesh formed at the first catching section 2101 and are intercepted by the filter mesh formed by the first intercepting section 2102 and the second filter wire 211. The extension length of the first fishing section 2101 can be greater than, less than or equal to the extension length of the first interception section 2102. The connection between the first fishing section 2101 and the first interception section 2102 can be smoothly transitioned or arranged at a certain angle. The first fishing section 2101 and the first interception section 2102 can be an integral structure or a split structure. This application embodiment does not limit this.

[0062] Combination Figure 11 In other embodiments, the filter body includes a third filter wire 213 and a fourth filter wire 214. Multiple third filter wires 213 are arranged circumferentially around the guide wire 100, and their two ends are connected to a proximal collar 220 and a distal collar 230, respectively. Multiple fourth filter wires 214 are connected between adjacent third filter wires 213, and the distance between the fourth filter wire 214 and the proximal collar 220 is greater than the distance between it and the distal collar 230; that is, the fourth filter wire 214 is positioned closer to the distal collar 230. The third filter wires 213 and fourth filter wires 214 cooperate to form multiple filter mesh openings. In this embodiment, the placement of the fourth filter wires 214 densifies the filter mesh openings at the distal end of the filter 200, thereby achieving reliable filtration of thrombi.

[0063] Furthermore, combining Figure 11 The third filter wire 213 includes a second catching section 2131 and a second intercepting section 2132. The proximal end of the second catching section 2131 is connected to a proximal collar 220; the proximal end of the second intercepting section 2132 is connected to the distal end of the second catching section 2131, and the distal end of the second intercepting section 2132 is connected to a distal collar 230. Both ends of the fourth filter wire 214 are respectively connected to the second intercepting sections 2132 of the two adjacent third filter wires 213. When the filter 200 is operating within the blood vessel, the distance between the second catching section 2131 and the guidewire 100 gradually increases from the proximal end to the distal end, while the distance between the second intercepting section 2132 and the guidewire 100 gradually decreases. Thrombi enter the filter body through the filter mesh formed at the second catching section 2131 and are intercepted by the filter mesh formed by the second intercepting section 2132 and the fourth filter wire 214. The extension length of the second fishing section 2131 can be greater than, less than or equal to the extension length of the second interception section 2132. The connection between the second fishing section 2131 and the second interception section 2132 can be smoothly transitioned or arranged at a certain angle. The second fishing section 2131 and the second interception section 2132 can be an integral structure or a split structure. This application embodiment does not limit this.

[0064] In some embodiments disclosed in this application, the filter 200 includes a mesh bag and a skeleton, both disposed at the distal end of the guidewire 100, with the skeleton connected to the mesh bag. The mesh bag has filter mesh openings. The mesh bag is made of a flexible material, and the skeleton is made of a shape-memory alloy, and can be unfolded or folded. When the filter 200 is operating within a blood vessel, the skeleton unfolds and can expand the mesh bag to intercept thrombi. During entry into or exit from the body through the catheter 300, the skeleton folds and can enter the catheter 300 together with the mesh bag. The size of the filter mesh openings on the mesh bag is easily controllable, resulting in a simple structure and convenient manufacturing. This application does not limit the specific structure of the skeleton.

[0065] To facilitate position adjustment, the proximal collar 220 and / or the distal collar 230 can be made of radiopaque materials such as platinum-iridium alloy to mark the starting and ending positions of the filter 200; alternatively, a radiopaque device can be provided on the guidewire 100, and the radiopaque device can be positioned between the proximal collar 220 and the distal collar 230. Specifically, the radiopaque device can be a radiopaque ring, which is fitted on the outer surface of the guidewire 100 and is visible under X-rays. During surgery, it can mark the position of the filter 200, making it easy for the operator to deliver the filter 200 to the target working position during surgery.

[0066] Combination Figure 1 and Figure 6 A catheter seat 400 is provided at the proximal end of the catheter 300. A first interface 401 and a second interface 402 are provided on the catheter seat 400. The first interface 401 is connected to the inner lumen of the catheter 300, and the second interface 402 is for the filter 200 and the guide wire 100 to pass through.

[0067] In a further embodiment, the thrombus filtration device disclosed in this application also includes a suction device 500. The catheter seat 400 is provided with a third interface 403 communicating with the inner lumen of the catheter 300. The suction device 500 is connected to the third interface 403 and is used to provide negative pressure into the catheter 300 to suction out the thrombus collected in the filter 200 and prevent the thrombus collected during the retrieval of the filter 200 from escaping, thereby improving the safety and reliability of the procedure. The suction device 500 specifically includes a pump for providing negative pressure, and a pipeline for connecting the catheter seat 400 and the pump, among other structures.

[0068] In order to prevent the second interface 402 from affecting the suction effect of the suction device 500, the thrombus filtering device disclosed in this application also includes a sealing element, which can seal the second interface 402 when the suction device 500 is started.

[0069] In addition to being led out from the aforementioned catheter seat 400, the guidewire 100 and filter 200 can also be quickly led out from a quick-access interface provided on the side wall of the proximal end of the catheter 300.

[0070] One specific clinical implementation method of this application: combined with Figures 8-9 In its initial configuration, the filter 200 remains in transport and is housed within the lumen of the catheter 300. During vascular stenosis dilation surgery, the guidewire 100 and catheter 300 are traversed through the narrowed area of ​​the blood vessel, and the filter 200 is delivered to the distal end of the narrowed site. Subsequently, the catheter 300 is withdrawn from the body, during which time the filter 200 is released from within the catheter 300 and automatically deploys into its working state. Next, the medical device for vascular dilation treatment is delivered to the lesion site via the guidewire 100 for surgical manipulation. During the procedure, any detached thrombus fragments will be removed by the filter 200. The thrombus is captured by the guidewire 100, while the blood continues to flow through the filter mesh of the filter 200. After the vasodilator procedure is completed, the medical device is withdrawn along the guidewire 100, and the catheter 300 is advanced back along the guidewire 100 to the vicinity of the filter 200. The suction device 500 is activated, using the negative pressure it generates to draw the thrombus in the filter 200 into the catheter 300. When the procedure is finished and the thrombus filter needs to be removed, the filter 200 is retracted into the lumen of the catheter 300 by pulling the guidewire 100 proximally or advancing the catheter 300 distally, restoring it to its transport state. Finally, the filter 200 can be withdrawn from the patient's body along with the guidewire 100 and the catheter 300. The thrombus filter disclosed in this application intercepts and collects thrombi that detach during the procedure at the distal end of the vascular lesion site without affecting blood perfusion. After the procedure, the filter 200 and the thrombus in the filter 200 can be withdrawn from the body together. The procedure is simple, effectively reduces the risk of distal vascular embolism, and improves the success rate of the procedure.

[0071] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Specific technical means in some embodiments may be incorporated, in whole or in part, into another embodiment unless explicitly excluded by another embodiment. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A thrombus filtration device, characterized in that, The device includes a catheter (300), a guidewire (100), and a filter (200). The filter (200) is fixedly disposed at the distal end of the guidewire (100) and is provided with a filter mesh for capturing thrombi. The guidewire (100) and the filter (200) are movably inserted into the lumen of the catheter (300) to enter or exit the blood vessel.

2. The thrombus filtering device as described in claim 1, characterized in that, The filter mesh located near the filter (200) is a first mesh (240), and the mesh located at the far end of the filter (200) is a second mesh (241). The opening area of ​​the first mesh (240) is larger than the opening area of ​​the second mesh (241). When the filter (200) is operating inside a blood vessel, the first mesh (240) allows thrombi and blood to enter the filter (200), and the second mesh (241) filters the blood and intercepts the thrombi.

3. The thrombus filtration device as described in claim 1, characterized in that, The filter (200) has a transport state and an operating state, and the filter (200) includes: A proximal collar (220) is fixedly disposed at the distal end of the guidewire (100); The distal collar (230) is slidably disposed on the guidewire (100) and disposed at the distal end of the proximal collar (220); The filter body is provided with the filter mesh, and the two ends of the filter body are respectively connected to the proximal collar (220) and the distal collar (230); When the filter (200) is inside the conduit (300), the filter (200) is in the transport state, and the proximal collar (220) and the distal collar (230) are spaced apart by a first distance. When the filter (200) is outside the conduit (300), the filter (200) is in the working state, and the proximal collar (220) and the distal collar (230) are spaced apart by a second distance, wherein the first distance is greater than the second distance.

4. The thrombus filtering device as described in claim 3, characterized in that, The filter body includes: The first filter wire (210) consists of a plurality of wires arranged circumferentially around the guide wire (100), and both ends are connected to the proximal collar (220) and the distal collar (230) respectively. A retaining ring (212) is fitted onto the guide wire (100) and disposed between the proximal collar (220) and the distal collar (230), and is connected to the first filter wire (210); The second filter wire (211) consists of a plurality of wires arranged circumferentially around the guide wire (100), and one end of the second filter wire (211) is connected to the fixing ring (212) and the other end is connected to the distal collar (230).

5. The thrombus filtering device as described in claim 4, characterized in that, The first filter wire (210) includes: The first fishing section (2101) is connected to the proximal end of the first fishing section (2101) by the proximal end collar (220); The first interception section (2102) has its proximal end connected to the distal end of the first fishing section (2101), and its distal end connected to the distal end collar (230). The fixed ring (212) is connected to the proximal end of the first interception section (2102). When the filter (200) is operating in the blood vessel, the distance between the first catching segment (2101) and the guidewire (100) gradually increases along the direction from the proximal end to the distal end of the guidewire (100), while the distance between the first intercepting segment (2102) and the guidewire (100) gradually decreases.

6. The thrombus filtration device as described in claim 3, characterized in that, The filter body includes: The third filter wire (213) consists of multiple wires arranged circumferentially around the guide wire (100), and both ends are connected to the proximal collar (220) and the distal collar (230) respectively. There are multiple fourth filter wires (214) connected between two adjacent third filter wires (213), and the distance between the fourth filter wire (214) and the proximal collar (220) is greater than the distance between the fourth filter wire (214) and the distal collar (230).

7. The thrombus filtering device as described in claim 6, characterized in that, The third filter wire (213) includes: The second fishing section (2131) is connected at its proximal end to the proximal end collar (220); The second interception section (2132) has its proximal end connected to the distal end of the second fishing section (2131), and its distal end connected to the distal end collar (230). The two ends of the fourth filter wire (214) are respectively connected to the second interception section (2132) of the two adjacent third filter wires (213). When the filter (200) is operating in the blood vessel, the distance between the second catching segment (2131) and the guidewire (100) gradually increases along the direction from the proximal end to the distal end of the guidewire (100), while the distance between the second intercepting segment (2132) and the guidewire (100) gradually decreases.

8. The thrombus filtering device as described in claim 3, characterized in that, The filter body includes a mesh bag and a frame. The frame and the mesh bag are both located at the distal end of the guide wire (100), and the frame is connected to the mesh bag. The mesh bag is provided with the filter mesh. When the filter (200) is operating within a blood vessel, the skeleton expands the mesh.

9. The thrombus filtering device as described in claim 3, characterized in that, The proximal collar (220) and / or the distal collar (230) are made of a developing material; And / or, the guidewire (100) is provided with a developing device, and the developing device is disposed between the proximal collar (220) and the distal collar (230).

10. The thrombus filtering device according to any one of claims 1-9, characterized in that, It also includes a suction device (500) connected to the proximal end of the catheter (300) for providing negative pressure into the catheter (300).

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