Lower limb deep vein thrombus cleaning device

Abstract

The invention relates to a lower limb deep vein thrombus cleaning device, and belongs to the technical field of medical instruments. The thrombus removal device comprises a thrombus removal mesh basket assembly, the front end is inserted into a catheter in the blood flowing direction and penetrates through a vein valve and thrombus, and the thrombus removal mesh basket assembly is used for cleaning and containing the thrombus at the front end of the vein valve; the rotary telescopic assembly is arranged at the rear end of the thrombus extraction mesh basket assembly and used for controlling the thrombus extraction mesh basket assembly to stretch out, draw back and rotate in the target blood vessel so as to cut or scrape thrombus; the front end of the collecting assembly is inserted into the catheter in the blood flowing direction, abuts against the rear end of the vein valve and is used for cleaning and collecting thrombus at the front end and the rear end of the vein valve. The problem of cleaning blind areas caused by irregular outlines of the vein valve areas is effectively solved, and the thrombus cleaning device has the advantages that thrombus at the front end and the rear end of the vein valve can be cleaned at the same time, cleaning blind areas are effectively reduced, thoroughness of thrombus cleaning is improved, and thrombus residual risks are reduced.

Description

Technical Field

[0001] This invention relates to a device for clearing deep vein thrombosis in the lower extremities, belonging to the field of medical device technology. Background Technology

[0002] Deep vein thrombosis (DVT) of the lower extremities is a common vascular disease in clinical practice. Its formation is closely related to factors such as hypercoagulable states, slow venous blood flow, and damage to the vessel wall. Venous valves, as key structures maintaining unidirectional blood return within the deep venous system, have significantly unique anatomical features, including complex structures such as valve leaflets, interleaflet spaces, and irregular surfaces. Because blood flow direction changes in this area, local flow velocity is significantly slowed, making it easy for thrombi to adhere to the valve surface, interleaflet spaces, and surrounding dead zones, forming persistent lesions. If such thrombi are not completely removed, they can detach and cause life-threatening complications such as pulmonary embolism, posing a serious threat to patient safety.

[0003] Currently, clinical thrombectomy methods mainly include thrombolysis and mechanical thrombectomy. While mechanical thrombectomy devices can partially resolve thrombus issues, they have significant limitations. For example, invention patent CN113425373B discloses a vascular thrombectomy device that uses an aspiration catheter in conjunction with a hollow mesh thrombectomy device. After isolating blood flow through a blocking structure, the rotating mesh structure breaks and scrapes the thrombus, extracting the hollow mesh structure from the aspiration catheter. However, when dealing with venous valve areas, this type of device cannot adapt to the irregular contours and flexible characteristics of the valves, making it difficult for the thrombectomy device to effectively conform to the valve surface and gaps, creating blind spots for clearing thrombi attached to the valves. Specifically, the conventional mesh structure cannot fully expand at the valve leaflet gaps, failing to simultaneously cover the thrombus areas at both the anterior and posterior ends of the valve, significantly increasing the risk of thrombus residue and affecting the overall treatment outcome. Furthermore, existing devices lack a dynamic adaptation mechanism for the specific morphology of venous valves, making them prone to displacement under blood flow impact, further reducing the accuracy and reliability of thrombectomy. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, this application provides a device for clearing deep vein thrombosis in the lower extremities, which aims to improve the accuracy and reliability of thrombus removal.

[0005] This invention provides a device for clearing deep vein thrombosis in the lower extremities, comprising a catheter inserted into a target blood vessel and a guidewire inserted into the catheter, and further comprising: a thrombectomy basket assembly, the front end of which is inserted into the catheter along the direction of blood flow and passes through the venous valve and the thrombus, for clearing and collecting the thrombus at the front end of the venous valve; a rotating and telescopic assembly disposed at the rear end of the thrombectomy basket assembly, for controlling the extension, telescoping and rotating of the thrombectomy basket assembly in the target blood vessel to cut or scrape the thrombus; and a retraction assembly, the front end of which is inserted into the catheter along the direction of blood flow and abuts against the rear end of the venous valve, for clearing and collecting the thrombus at the rear end of the venous valve and for housing the thrombectomy basket assembly.

[0006] Through the above technical solutions, the thrombectomy basket assembly, designed with its front end aligned with the direction of blood flow, directly enters the area in front of the venous valve, effectively capturing thrombi attached to the surface of the venous valve and avoiding the omission of thrombi at the front end due to obstruction by the venous valve. The rotating and telescopic assembly drives the thrombectomy basket assembly to perform precise telescopic and rotating movements within the blood vessel, cutting or scraping the thrombi in the blood vessel, thereby clearing thrombi in blind spots. The retraction assembly, through its tight contact with the rear end of the venous valve, ensures that thrombi at both ends of the valve are completely wrapped and removed. The synergistic effect of these three components eliminates the blind spots in the venous valve area caused by its irregular shape.

[0007] In some embodiments, the thrombectomy basket assembly includes: an inner tube sleeved around the guidewire, with its front end penetrating a venous valve; a first basket slidably connected to the front end of the inner tube, with its opening facing the front end of the inner tube; and a second basket located at the front end of the first basket, with its opening facing the first basket.

[0008] Through the above technical solution, the second basket is located at the front end of the first basket with its opening facing the first basket, forming a front-to-back capture system. The front position prioritizes capturing intervalvular thrombi, and the opening guide design allows the thrombi to slide naturally into the first basket under the action of blood flow or vibration. The double-basket structure, through the coordinated cooperation of spatial position and opening direction, expands the coverage of the irregular three-dimensional shape of the venous valve, systematically solving the problem of blind spots in the cleaning of the valve surface and intervalvular area formed by the single-layer basket.

[0009] In some embodiments, the banding assembly includes: a banding tube sleeved around the outer periphery of the inner tube; a banding net with a front diameter larger than a rear diameter, located at the front end of the banding tube; and a vibrating ultrasound device located on the banding net for vibrating and differentiating the thrombus.

[0010] Through the above technical solution, the condenser tube slides along the axial direction of the inner tube to achieve precise position adjustment, so that the front end of the condenser net stably abuts against the rear end of the venous valve; the tapered design of the condenser net opens under the action of body temperature, with the large diameter part at the front end conforming to the surface of the venous valve and the gap between the valve leaflets, and the small diameter part at the rear end facilitating subsequent condensation operations; the vibrating ultrasound device is set on the surface of the condenser net to efficiently transmit vibration energy to the thrombus attachment point, and the high-frequency vibration breaks down stubborn thrombi and thrombi attached to the dead corner area of ​​the venous valve, thereby eliminating the blind spot for cleaning.

[0011] In some embodiments, the rotary telescopic assembly includes: a connecting rod, with its front end connected to the first basket and its rear end inserted into the inner tube, and a spiral groove formed along its outer periphery in an axial direction; a boss located on the inner wall of the inner tube and sleeved on the outer periphery of the connecting rod, the boss having a protrusion adapted to the spiral groove; and an elastic element sleeved on the outer periphery of the connecting rod, with its two ends connected to the connecting rod and the boss, respectively.

[0012] Through the above technical solution, under the action of cyclical venous blood flow, the first and second baskets move towards the front end. The connecting rod is guided by the spiral groove to rotate while sliding along the axial direction, thereby driving the first and second baskets to rotate synchronously. At the same time, the elastic element is compressed. This structure decomposes the single telescopic input into a precise combined rotation and telescopic motion. Venous blood stops flowing, the elastic element extends, and the first and second baskets move towards the rear end, so that the basket assembly can dynamically adjust the scraping path according to the morphology of the thrombus based on the venous blood flow, effectively covering the cleaning blind spots of the valve surface and gaps.

[0013] In some embodiments, the first and second net baskets are provided with a plurality of elastic contractile and expandable supports for expanding the first and second net baskets so that the outer periphery of the first and second net baskets abuts against the inner wall of the blood vessel.

[0014] Through the above technical solution, the contractile expansion support undergoes elastic deformation under the action of body temperature, actively expanding the first and second baskets, so that the outer periphery of the first and second baskets is in close contact with the inner wall of the blood vessel; when the first and second baskets pass through the venous valve area, the contractile expansion support responds immediately to the local shape change, adjusting its expansion and contraction state to conform to the valve leaflet surface and gap contour, thereby avoiding the defect of traditional rigid structures being unable to conform to complex curved surfaces, and ensuring that the first and second baskets maintain effective scraping and retraction capabilities under the periodic action of blood flow.

[0015] In some embodiments, the first and second baskets are woven from shape memory alloy wires, and the mesh aperture of the first basket is larger than that of the second basket.

[0016] Through the above technical solution, the shape memory alloy wire woven basket structure automatically expands under body temperature to adapt to the curved contour of the venous valve and the gap between the leaflets, avoiding cleaning dead zones caused by insufficient rigidity of the first and second baskets. At the same time, based on the distribution characteristics of thrombi in the venous valve area, which often present as a combination of large attached fragments and small particles, the large-aperture first basket captures larger thrombus fragments to prevent them from escaping under the impact of blood flow, while the small-aperture second basket intercepts small thrombus particles. The two form a synergistic capture mechanism to ensure that thrombi of different sizes are effectively collected, thereby improving the integrity and reliability of the overall cleaning.

[0017] In some embodiments, the rear diameter of the first basket is smaller than the front diameter of the gathering net.

[0018] With the above technical solution, when the inner tube is retracted, the front end of the gathering net first contacts the rear end of the first net basket. Since the diameter of the rear end of the first net basket is smaller than the diameter of the front end of the gathering net, the front end of the gathering net can smoothly slide past the rear end of the first net basket without obstruction. This allows the gathering net to completely fit the outer periphery of the first net basket during the wrapping process, effectively preventing thrombi from leaking out from the gap between the first net basket and the gathering net, and ensuring that the thrombi are completely collected and removed.

[0019] This application provides a device for clearing deep vein thrombosis in the lower extremities. It employs a thrombectomy basket assembly that passes through the venous valve to clear thrombi at the anterior end, a collection assembly that abuts against the posterior end of the valve to simultaneously collect thrombi at both ends, and a rotating and telescopic assembly that controls the basket's extension, rotation, and thrombus cutting. This synergistic design effectively solves the problem of blind spots in the venous valve area caused by its irregular contour. It has the advantages of simultaneously clearing thrombi at both the anterior and posterior ends of the venous valve, effectively reducing blind spots, improving the thoroughness of thrombus removal, and lowering the risk of residual thrombi. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0021] Figure 2 This is a cross-sectional view of the overall structure of an embodiment of this application.

[0022] Figure 3 The present application mainly illustrates the structural diagram of the first basket.

[0023] Figure 4 The present application mainly illustrates the structural diagrams of the first and second net baskets in its embodiments.

[0024] Figure 5 This is a schematic diagram of the structure after the blood vessels are hidden in an embodiment of this application.

[0025] Figure 6 For this application Figure 6 An enlarged schematic diagram of part A in the middle.

[0026] Figure 7 for Figure 2 Enlarged diagram of part B.

[0027] Figure 8 The following is a schematic diagram illustrating the structure of the pointed tube, which is the main embodiment of this application.

[0028] Figure 9 The following is a schematic diagram illustrating the structure of the rotary telescopic component, which is the main embodiment of this application.

[0029] Figure 10 This is a schematic diagram of the inner tube structure in an embodiment of this application.

[0030] Figure 11 This is a cross-sectional view of the inner tube in an embodiment of this application.

[0031] Figure 12 This is a structural schematic diagram of a cross-sectional view of the rotary telescopic component according to an embodiment of this application.

[0032] Figure 13 This is a schematic diagram of the structure of the convergence component in an embodiment of this application.

[0033] Figure 14 This is a schematic diagram of the structure of the netting passing through the venous valve in an embodiment of this application.

[0034] Figure 15 This is a schematic diagram of the structure of the retractable retaining basket assembly in an embodiment of this application.

[0035] Figure 16 The following is a schematic diagram illustrating the structure of the venous valve, which is the main embodiment of this application.

[0036] The labels in the attached diagram are as follows: 10, blood vessel; 11, catheter; 12, guidewire; 13, venous valve; 2, thrombectomy basket assembly; 21, inner tube; 22, first basket; 23, second basket; 3, rotating telescopic assembly; 31, connecting rod; 311, first stop; 312, second stop; 313, spiral groove; 32, boss; 321, protrusion; 33, elastic element; 4, convergence assembly; 41, convergence tube; 42, convergence net; 43, vibrating ultrasound device; 51, first contraction-expansion support; 52, second contraction-expansion support; 61, first connecting post; 62, second connecting post; 7, pointed tube. Detailed Implementation

[0037] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of this application.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0039] When describing positional relationships, unless otherwise specified, when an element, such as a layer, film, or substrate, is referred to as being "on" another element, it may be directly on the other element or there may be intermediate elements present. Furthermore, when a layer is referred to as being "below" another layer, it may be directly below it or there may be one or more intermediate elements present. It is also understood that when a layer is referred to as being "between" two layers, it may be the only layer between the two layers, or there may be one or more intermediate elements present.

[0040] When using the terms “including,” “having,” and “comprising” as described herein, another component may be added unless explicitly qualifying terms such as “only,” “consisting of,” etc. are used. Unless otherwise stated, singular terms may include plural forms and should not be construed as having a quantity of one.

[0041] It should be understood that although the terms “first,” “second,” etc., may be used herein to describe various elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from another. For example, without departing from the scope of this application, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element.

[0042] It should also be understood that, in interpreting an element, although not explicitly described, the element is interpreted as including a range of error, which should be within the acceptable deviation range of a particular value as determined by a person skilled in the art. For example, "approximately," "about," or "substantially" can mean within one or more standard deviations, without limitation herein.

[0043] Furthermore, in the instruction manual, the phrase "planar distribution diagram" refers to the diagram when the target part is viewed from above, and the phrase "cross-sectional diagram" refers to the diagram when the target part is viewed from the side as a cross-section taken by vertically cutting the target part.

[0044] Furthermore, the accompanying drawings are not drawn to a 1:1 scale, and the relative dimensions of the components are shown in the drawings only as examples and not necessarily to actual scale.

[0045] This invention provides a device for clearing deep vein thrombosis in the lower extremities, such as... Figure 1-16As shown, the device includes a catheter 11 inserted into the target blood vessel 10 and a guidewire 12 inserted into the catheter 11. It also includes a thrombectomy basket assembly 2, a rotating telescopic assembly 3, and a retracting assembly. The front end of the thrombectomy basket assembly 2 is inserted into the catheter 11 along the blood flow direction and passes through the venous valve 13 and the thrombus, used to clear and collect the thrombus at the front end of the venous valve 13. The rotating telescopic assembly 3 is located at the rear end of the thrombectomy basket assembly 2 and is used to control the extension, retraction, and rotation of the thrombectomy basket assembly 2 in the target blood vessel 10 to cut or scrape the thrombus. The front end of the retracting assembly is inserted into the catheter 11 along the blood flow direction and abuts against the rear end of the venous valve 13, used to clear and collect the thrombus at the rear end of the venous valve 13, and to collect the thrombectomy basket assembly 2.

[0046] Reference Figure 1 and Figure 2 The thrombectomy basket assembly 2 includes an inner tube 21, a first basket 22, and a second basket 23. The inner tube 21 is sleeved around the guidewire 12, and the front end of the inner tube 21 is inserted into the catheter 11 and passes through the venous valve 13; see reference. Figure 3 and Figure 4 The first mesh basket 22 is located at the front end of the inner tube 21 and is slidably connected to the front end of the inner tube 21, with its opening facing the front end of the inner tube 21; the second mesh basket 23 is located at the front end of the first mesh basket 22 and has its opening facing the first mesh basket 22. The first mesh basket 22 and the second mesh basket 23 are provided with multiple elastic contraction and expansion support members to expand the first mesh basket 22 and the second mesh basket 23 so that the outer periphery of the first mesh basket 22 and the second mesh basket 23 abuts against the inner wall of the blood vessel 10. The first mesh basket 22 and the second mesh basket 23 are woven with shape memory alloy wire, and the mesh aperture of the first mesh basket 22 is larger than that of the second mesh basket 23. In this embodiment, the first basket 22 and the second basket 23 are woven from TiNi-01 titanium-nickel shape memory alloy wire. The mesh aperture of the first basket 22 is 0.25-0.3mm, and the mesh aperture of the second basket 23 is 0.1-0.2mm. The first basket 22 and the second basket 23 are funnel-shaped. When unfolded, the diameter of the front opening is smaller than that of the rear opening, allowing it to expand naturally within the blood vessel to conform to the vessel wall and adapt to the irregular shape of the valve. The edges of the first basket 22 and the second basket 23 are designed with smooth transitions to reduce frictional damage to the vessel wall and valve. Based on the distribution characteristics of thrombi in the venous valve 13 area, which often presents as a combination of large attached fragments and small particles, the large-aperture first basket 22 captures larger thrombus fragments to prevent them from escaping under the impact of blood flow, while the small-aperture second basket 23 intercepts small thrombus particles. The two form a synergistic capture mechanism to ensure that thrombi of different sizes are effectively collected, thereby improving the integrity and reliability of the overall cleaning.

[0047] Reference Figure 5 and Figure 6The rotating telescopic assembly 3 includes a connecting rod 31, a boss 32, and an elastic element 33. The front end of the connecting rod 31 is connected to the first net basket 22 via a contraction and expansion support, and the rear end is inserted into the inner tube 21. A first stop 311 is fixedly connected to the front end of the connecting rod 31, and the rear end of the first stop 311 abuts against the front end of the inner tube 21. A first connecting post 61 is provided between the first net basket 22 and the second net basket 23. The contraction and expansion support includes a first contraction and expansion support 51 and a second expansion support 52. The rear end of the first contraction and expansion support 51 is fixedly connected to the front end of the first stop 311, and the front end of the first contraction and expansion support 51 passes through the rear end and front end of the first net basket 22 and is fixedly connected to the rear end of the first connecting post 61. The outer periphery of the shrinkable expansion support 51 is fixedly connected to the inner wall of the first net basket 22. In this embodiment, the shrinkable expansion support is a support structure with shape memory function, forming an adjustable support network inside the first net basket 22 and the second net basket 23. The shrinkable expansion support is fixedly connected to the inner side of the first net basket 22 and the second net basket 23. Specifically, the shrinkable expansion support is a TiNi-01 titanium nickel shape memory alloy wire with a phase transformation temperature of 35-45℃. The hardness of the shrinkable expansion support decreases at room temperature, and the first net basket 22 and the second net basket 23 are in a contracted state. After the first net basket 22 and the second net basket 23 enter the human body, as the temperature rises, the first net basket 22, the second net basket 23, and the shrinkable expansion support expand to a preset shape.

[0048] Reference Figure 6 and Figure 7 To promote blood flow, a gap is provided between the guidewire 12 and the inner wall of the front end of the first basket 22. The width of the gap is smaller than the aperture of the first basket 22 and larger than the aperture of the second basket 23. The rear end of the second contraction expansion support 52 is fixedly connected to the front end of the first connecting post 61. The front end of the second contraction expansion support 52 passes through the rear end and the front end of the second basket 23 and is fixedly connected to the second connecting post 62. The outer periphery of the second contraction expansion support 52 is fixedly connected to the inner wall of the second basket 23. The front end of the second basket 23 is fixedly connected to the rear end of the second connecting post 62. (Refer to...) Figure 5 and Figure 8 In order to facilitate the thrombectomy basket assembly 2 to penetrate the thrombus area and reduce the chance of thrombus dislodgement, the front end of the second connecting post 62 is provided with a pointed tube 7. The diameter of the rear end of the pointed tube 7 is larger than the diameter of the front end, and the rear end of the pointed tube 7 is fixedly connected to the second connecting post 62.

[0049] Reference Figure 5 and Figure 9 The connecting rod 31 has a spiral groove 313 axially formed on its outer periphery. A boss 32 is fixedly connected to the inner wall of the inner tube 21. The boss 32 is sleeved on the outer periphery of the connecting rod 31 and abuts against the outer periphery of the connecting rod 31. The rear end of the first stop block 311 abuts against the front end of the boss. (Refer to...) Figure 10 and Figure 11 The boss 32 is fixedly provided with a protrusion 321 that matches the spiral groove 313; see reference. Figure 9 and Figure 12 A second stop 312 is fixedly connected to the rear end of the connecting rod 31. The diameter of the second stop 312 is larger than the diameter of the connecting rod 31. An elastic element 33 is sleeved on the outer periphery of the connecting rod 31, and its two ends are fixedly connected to the front end of the second stop 312 and the rear end of the boss 32, respectively. The first basket 22 and the second basket 23 move towards the front end. The connecting rod 31 rotates while sliding axially under the guidance of the spiral groove 313, thereby driving the first basket 22 and the second basket 23 to rotate synchronously. At the same time, the elastic element 33 is compressed. This structure decomposes the single telescopic input into a precise rotation and telescopic composite motion. The venous blood stops flowing, the elastic element 33 extends, and drives the first basket 22 and the second basket 23 to move towards the rear end. The thrombectomy basket assembly 2 can dynamically adjust the scraping path according to the thrombus morphology based on the venous blood flow, effectively covering the cleaning blind area of ​​the surface and gap of the venous valve 13. In this embodiment, the elastic element 33 is made of 316 stainless steel, and the elastic coefficient is between 0.1N / mm and 0.5N / mm.

[0050] In this embodiment, the diameter of the target blood vessel is 5-10 mm, the diameter of the connecting rod 31 is 0.5-0.8 mm, and the maximum diameter of the rear opening when the first basket 22 and the second basket 23 are opened is 6-12 mm.

[0051] Reference Figure 1 and Figure 13 The converging assembly includes a converging tube 41, a converging net 42, and a vibrating ultrasonic device 43. The converging tube 41 is sleeved around the outer periphery of the inner tube 21 and abuts against the outer periphery of the inner tube 21. The rear end of the converging net 42 is fixedly connected to the front end of the converging tube 41 and communicates with the converging tube 41. The front diameter of the converging net 42 is larger than the rear diameter. The vibrating ultrasonic device 43 is located inside the converging net 42. To improve the vibration effect, multiple vibrating ultrasonic devices 43 are provided for vibrational differentiation of thrombi. In this embodiment, three vibrating ultrasonic devices 43 are provided. The three vibrating ultrasonic devices 43 are connected to the inner periphery of the inner tube 21. The basket is coaxially arranged; the coiling tube 41 slides along the axial direction of the inner tube 21 to achieve precise position adjustment, so that the front end of the coiling net 42 stably abuts against the rear end of the venous valve 13; the tapered design of the coiling net 42 opens under the action of body temperature, with the large diameter part at the front end fitting the surface of the venous valve 13 and the gap between the leaflets, and the small diameter part at the rear end facilitating subsequent coiling operations. In this embodiment, the coiling net 42 is woven from nickel-titanium alloy wire with a radial stiffness of 0.8 N / mm and a diameter of 8–14 mm when the front end is open, ensuring adaptive fitting with the anatomical shape of the venous valve 13.

[0052] The vibrating ultrasound device 43 is disposed on the surface of the basket 42, efficiently transmitting vibration energy to the thrombus attachment point. It uses high-frequency vibration to differentiate stubborn thrombi and those attached to the dead zones of the venous valve 13, thereby eliminating blind spots in the cleaning process. In this embodiment, the vibrating ultrasound device 43 employs a high-frequency ultrasonic vibration module with a vibration frequency range of 20-50kHz. It is connected to an external control terminal via wires, allowing adjustment of the vibration intensity according to the thrombus condition. The vibration range of the ultrasound device covers the front end and surrounding area of ​​the basket, directly acting on the unidirectional valve area. The vibrating ultrasound device 43 is made of an integrated micro-focused piezoelectric crystal array (PZT-8 material), with each crystal having a diameter of 1mm and a thickness of 0.2mm. Three crystals are arranged in a ring, with a resonant frequency of 3MHz, acting only on the thrombus area.

[0053] The second aspect of the present invention provides an operating method for a lower extremity deep vein thrombosis removal device, comprising the following steps: pre-setting a guidewire 12 at the location of the blocked blood vessel 10; inserting a catheter 11 into the target blood vessel 10 along the guidewire 12; inserting a thrombectomy basket assembly 2 along the guidewire 12; when the first basket 22 and the second basket 23 reach the thrombus location and the inner tube 21 passes through the venous valve 13, the first basket 22 and the second basket 23 open up to the point where their outer walls abut against the inner wall of the blood vessel 10 under the action of body temperature; inserting a coiling assembly 4 along the inner tube 21; the coiling net 42 opens up to the point where it abuts against the inner wall of the blood vessel 10 under the action of body temperature. The inner wall is brought into contact with the surrounding area. The constricting tube 41 is adjusted so that the front end of the constricting net 42 is in contact with the venous valve 13. The vibrating ultrasound device 43 is turned on, causing the constricting net 42, the venous valve 13, the first basket 22, the second basket 23 and the surrounding area to vibrate. The first basket 22 and the second basket 23 reciprocate and slide through the rotating telescopic component 3 under the action of the periodic blood flow in the vein. The constricting tube 41 is pushed forward so that the front end of the constricting net 42 passes through the venous valve 13. The inner tube 21 is withdrawn so that the constricting net 42 wraps around the first basket 22 and the second basket 23 in sequence. The guide wire 12 is pulled out to complete the removal of the thrombus.

[0054] Reference Figure 1 and Figure 5 The diameter of the rear end of the first basket 22 is smaller than the diameter of the front end of the gathering net 42. When the inner tube 21 is retracted, the front end of the gathering net 42 first contacts the rear end of the first basket 22. Since the diameter of the rear end of the first basket 22 is smaller than the diameter of the front end of the gathering net 42, the front end of the gathering net 42 can smoothly slide over the rear end of the first basket 22 without obstruction. This allows the gathering net 42 to completely fit the outer periphery of the first basket 22 during the wrapping process, effectively preventing thrombi from leaking out from the gap between the first basket 22 and the gathering net 42, and ensuring that the thrombi are completely collected and removed.

[0055] Reference Figure 1When the thrombectomy basket assembly 2 and the retracting assembly enter the target blood vessel 10, the first basket 22 and the second basket 23 automatically open under the influence of body temperature and abut against the inner wall of the blood vessel 10. Utilizing the shape memory alloy properties triggered by body temperature, the first basket 22 and the second basket 23 tightly adhere to the inner wall of the blood vessel 10. Next, the retracting net 42 opens and abuts against the front end of the venous valve 13. The vibrating ultrasound device 43 is activated, causing the retracting net 42, the venous valve 13, and the areas of the first basket 22 and the second basket 23 to vibrate. Based on the ultrasound energy, the thrombus structure is differentiated, especially loosening stubborn thrombi attached to the gaps in the venous valve 13. Simultaneously, the periodic venous blood flow drives the first basket 22 and the second basket 23 to reciprocate through the rotating telescopic assembly 3. Using the natural fluctuations of physiological blood flow as a power source, the first basket 22 and the second basket 23 generate micro-rotational motion in the venous valve 13 area, effectively scraping away surface thrombi without relying on an external motor. Then, referring to... Figure 14 , Figure 15 and Figure 16 Pulling back the constricting tube 41 partially retracts the constricting net 42 into the catheter 11, reducing the diameter of the front end of the constricting net 42. Pushing the catheter 11 forward allows the constricting net 42 to pass through the venous valve 13. Then, pushing the constricting tube 41 further allows the constricting net 42 to fully extend from the catheter and fully unfold. Finally, pulling back the inner tube 21 causes the constricting net 42 to wrap around the first basket 22 and pulls the thrombus wrapped in the first basket 22 back into the constricting tube 41. The vibration-sensing ultrasound device 33 and the negative pressure extraction device are then activated to extract the thrombus from the body. The remaining thrombus at the edge of the first basket 22, as well as some fragmented thrombus, enters... Insert the second basket 23; turn off the vibrating ultrasound device 33, and continue to pull back the inner tube 21 to retract the second basket 23 into the collection tube 41. Combined with negative pressure suction, complete collection of the thrombus is achieved, preventing the thrombus from falling off and ensuring overall removal. This device solves the problem of blind spots in the cleaning of thrombi caused by changes in blood flow direction and slowing local flow velocity in the venous valve 13 area. It avoids the defects of existing thrombectomy devices that cannot adapt to the irregular shape of the venous valve 13 and the gaps of the venous valve 13, and significantly improves the integrity and safety of thrombus removal.

[0056] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A device for clearing deep vein thrombosis in the lower extremities, comprising a catheter (11) inserted into a target blood vessel (10) and a guidewire (12) inserted into the catheter (11), characterized in that, Also includes: The thrombectomy basket assembly (2) has its front end inserted into the catheter (11) along the direction of blood flow and passes through the venous valve (13) and the thrombus, and is used to clear and collect the thrombus at the front end of the venous valve (13); A rotating telescopic component (3) is disposed at the rear end of the thrombectomy basket assembly (2) for controlling the thrombectomy basket assembly (2) to extend, retract, and rotate in the target blood vessel (10) to cut or scrape the thrombus; The gathering assembly (4) has its front end inserted into the catheter (11) along the direction of blood flow and abuts against the rear end of the venous valve (13) for clearing and storing thrombi at the rear end of the venous valve (13) and for storing the thrombectomy basket assembly (2).

2. The device for clearing deep vein thrombosis of the lower extremities according to claim 1, characterized in that, The retrieval basket assembly (2) includes: The inner tube (21) is sleeved around the guide wire (12), and its front end penetrates the venous valve (13); The first basket (22) is slidably connected to the front end of the inner tube (21), and its opening is set facing the front end of the inner tube (21); The second net basket (23) is located at the front end of the first net basket (22) and has an opening facing the first net basket (22).

3. The device for clearing deep vein thrombosis of the lower extremities according to claim 2, characterized in that, The convergence component (4) includes: A receiving tube (41) is sleeved on the outer periphery of the inner tube (21); The gathering net (42) has a front diameter larger than the rear diameter and is located at the front end of the gathering tube (41); A vibrating ultrasound device (43), located on the receiving net (42), is used to vibrate and differentiate thrombi.

4. The device for clearing deep vein thrombosis of the lower extremities according to claim 2, characterized in that, The rotary telescopic assembly (3) includes: The connecting rod (31) is connected to the first basket (22) at its front end and inserted into the inner tube (21) at its rear end. A spiral groove (313) is provided on its outer periphery along the axial direction. A boss (32) is located on the inner wall of the inner tube (21) and is sleeved on the outer periphery of the connecting rod (31). A protrusion (321) adapted to the spiral groove (313) is provided on the boss (32). An elastic element (33) is sleeved on the outer periphery of the connecting rod (31), and its two ends are connected to the connecting rod (31) and the boss (32) respectively.

5. The device for clearing deep vein thrombosis of the lower extremities according to claim 2, characterized in that, The first net basket (22) and the second net basket (23) are provided with a plurality of elastic contraction and expansion support members, which are used to open the first net basket (22) and the second net basket (23) so that the outer periphery of the first net basket (22) and the second net basket (23) abuts against the inner wall of the blood vessel (10).

6. The device for clearing deep vein thrombosis of the lower extremities according to claim 2, characterized in that, The first net basket (22) and the second net basket (23) are woven from shape memory alloy wires, and the mesh aperture of the first net basket (22) is larger than that of the second net basket (23).

7. The device for clearing deep vein thrombosis of the lower extremities according to claim 2, characterized in that, The rear diameter of the first basket (22) is smaller than the front diameter of the gathering net (42).

Images