Deep vein thrombosis removal device

Abstract

The present invention provides a deep vein thrombosis removal device, which relates to the field of medical devices, including an outer tube, an inner tube and a filter; the outer tube proximal end is fixedly connected to an outer tube handle; the inner tube passes through the outer tube handle, and the inner tube proximal end is fixedly connected to the inner tube handle; the filter is sleeved on the outside of the inner tube, and the distal end of the filter is fixedly connected to the inner tube, and the proximal end is movably connected to the inner tube, part of the inner tube and all the filters are passed through the central tube cavity of the outer tube, and the inner tube and the outer tube can slide relative to each other so that the outer tube can accommodate or release the filter; in the conveying state, the proximal end of the outer tube handle and the distal end of the inner tube handle are far away from each other, and in the state where the filter is completely released, the proximal end of the outer tube handle and the distal end of the inner tube handle are fixed together. The present invention alleviates the technical problems in the prior art that deep vein filters cause great damage to blood vessels during implantation, after implantation, during and after recovery, are difficult to recover, and are easy to tilt during and after implantation, and can simplify the complexity of thrombolysis surgery in conjunction with thrombolysis catheters, and improve surgical efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a deep vein thrombosis removal device. Background Art

[0002] Normally, the blood in the veins flows. Deep vein thrombosis (DVT) refers to the formation of blood clots in the veins, which partially or completely block the vein lumen. The formed blood clots will also fall off along the blood vessels and block the pulmonary blood vessels (the situation where the blood clots fall off and block the pulmonary blood vessels is called "pulmonary embolism"), thereby causing respiratory and circulatory dysfunction, and in severe cases, death. The most common symptoms of deep vein thrombosis of the lower limbs include: (1) blood clots block the deep veins of the lower limbs, causing swelling and pain (mostly pain in the back of the calf), increased skin temperature and redness; (2) blood clots fall off and block the pulmonary blood vessels, causing chest tightness, shortness of breath, difficulty breathing, and breath holding; chest pain, coughing, even coughing up blood, and accelerated heartbeat when inhaling or exerting force.

[0003] The current treatment method for deep vein thrombosis is to use a vena cava filter implanted percutaneously into the inferior vena cava to capture the thrombus that has fallen off the venous system. Combined with surgery, drugs or interventional methods, it can reduce the incidence of fatal pulmonary embolism, keep the deep veins unobstructed, and play an indispensable role in treating DVT and preventing pulmonary embolism. The existing vena cava filter mainly includes a filter arm composed of a fixed arm and an anchoring arm, and a retrieval hook fixedly connected to the proximal end of the filter arm. The distal end of the anchoring arm is provided with an anchoring hook. The function of the retrieval hook is to capture the retrieval hook in the blood vessel through a retrieval device after the filter is implanted in the human body for a period of time, and then pull it out of the body to achieve the retrieval of the filter; the anchoring hook is a barb structure, and its function is to insert the barb of the filter into the venous vessel wall after the filter is released in the blood vessel to prevent the filter from shifting.

[0004] The use of vena cava filters has a positive therapeutic effect on the treatment of most patients, but there are also some problems, mainly including:

[0005] (1) The blood vessels are severely damaged during implantation, implantation, retrieval, and retrieval. Specifically, the veins are very thin, and the anchor hook, a barbed structure that prevents displacement, can easily puncture or pierce the blood vessels, causing bleeding at the implantation site, which causes severe damage to the blood vessels. During retrieval, the anchor hook pierces the blood vessel wall, and after the filter is retrieved from the blood vessel, a large wound will be left at the original contact site, which causes severe damage to the blood vessels and is also very likely to accumulate blood clots again.

[0006] (2) Difficult to retrieve; specifically, the barbed anti-displacement structure pierces the blood vessel wall, causing endothelial proliferation. The endothelial tissue will gradually cover the vena cava filter after a period of time, causing the filter and the blood vessel to grow together, which will make it difficult to withdraw the filter from the blood vessel. In addition, the larger the contact area between the filter and the blood vessel tissue and the longer the contact time, the more difficult it is to retrieve the filter from the blood vessel (but if the retrieval time is too short, the filter will not work in the blood vessel for a long time, and the treatment effect will be far from achieved);

[0007] (3) It is easy to tilt during and after implantation. Specifically, after the vena cava filter is released into the blood vessel, the filter is easy to tilt, and the retrieval hook contacts the blood vessel wall, which makes it difficult for the retrieval hook to be captured by the retrieval device and difficult to retrieve. Although some vena cava filters use a large-angle bend near the retrieval hook of the fixed arm to contact the blood vessel wall to prevent tilting, it is found in actual use that this type of vena cava filter cannot completely avoid tilting, but only reduces the incidence of filter tilting. This is because when the filter is released, the filter anchor only contacts at a few points, and the blood will impact the filter. Under such complex conditions, it is also easy to cause the filter to tilt when released, resulting in the problem that the filter is difficult to safely remove from the blood vessel after completing its mission.

[0008] (4) The surgical procedure is complex and time-consuming. When used in conjunction with a thrombolytic device, the catheter and guide wire that delivers the filter need to be removed from the body before another deep vein thrombolytic catheter is used for thrombolysis. Summary of the invention

[0009] The object of the present invention is to provide a deep vein thrombosis removal device to alleviate all or part of the technical problems existing in the above-mentioned prior art.

[0010] Specifically, the embodiment of the present invention adopts the following technical solutions:

[0011] An embodiment of the present invention provides a deep vein thrombosis removal device, comprising an outer tube, an inner tube and a filter; the outer tube is provided with a central tubular cavity extending therethrough in the axial direction, and an outer tube handle is fixedly connected to the proximal end of the outer tube; the inner tube passes through the outer tube handle, and an inner tube handle is fixedly connected to the proximal end of the inner tube; the filter is sleeved on the outside of the inner tube, and the distal end of the filter is fixedly connected to the inner tube, and the proximal end is movably connected to the inner tube, and in a released state, the filter expands and unfolds along the radial direction of the inner tube to form an umbrella-shaped or spindle-shaped structure with hollow areas at both the proximal and distal ends; part of the inner tube and all of the filter are passed through the central tubular cavity of the outer tube, and the inner tube and the outer tube can slide relative to each other so that the outer tube can accommodate or release the filter.

[0012] In the conveying state, the proximal end of the outer tube handle and the distal end of the inner tube handle are away from each other, and when the filter is fully released, the proximal end of the outer tube handle and the distal end of the inner tube handle are fixed together.

[0013] Optionally, the filter includes a proximal constraint tube, a distal constraint tube and a middle hollow body, wherein the proximal constraint tube is sleeved on the outside of the inner tube and can slide axially relative to the inner tube; the distal constraint tube is sleeved and fixedly connected to the distal outer wall of the inner tube; the proximal end of the middle hollow body is fixed or integrally connected to the proximal constraint tube, and the distal end of the middle hollow body is fixed or integrally connected to the distal constraint tube.

[0014] Optionally, a plug-in buckle is provided at the proximal end of the outer tube handle, and a slot is provided at the distal end of the inner tube handle. When the filter is fully released, the proximal end of the outer tube handle and the distal end of the inner tube handle are plugged together through the plug-in buckle and the slot.

[0015] Optionally, a developing ring is fixed to the distal end of the outer tube.

[0016] The deep vein thrombosis removal device provided in the embodiment of the present invention at least alleviates the technical problems in the prior art that the deep vein filter causes great damage to the blood vessels during implantation, after implantation, during and after retrieval, is difficult to retrieve, and is prone to tilting during and after implantation. Its specific operation process and effect analysis are detailed in the specific implementation method section of this specification.

[0017] In addition, in order to solve the technical problem that the existing vena cava filter has a complicated and time-consuming surgical procedure, and when used with a thrombolytic device, the catheter and guide wire for delivering the filter need to be withdrawn from the body before using another deep vein thrombolytic catheter for thrombolytic treatment, the present application makes the following further improvements based on any of the above optional implementations:

[0018] In a first optional embodiment, the outer tube is further provided with a thrombolytic lumen along the axial direction, which is spaced from the central lumen and is closed at the distal end; an injection hole connected to the thrombolytic lumen is provided at the proximal end of the outer tube or the proximal end of the outer tube handle; and a liquid through hole connected to the thrombolytic lumen is provided on the distal outer wall of the outer tube.

[0019] In this optional embodiment, further optionally, the cross-section of the thrombolytic lumen along the circumference of the outer tube is annular, and multiple circles of liquid through holes are arranged at intervals along the axial direction of the outer tube, and each circle of liquid through holes is evenly arranged along the circumference of the outer tube.

[0020] In a second optional embodiment, the deep vein thrombosis removal device further comprises a thrombolytic hose, and an outer tube side wall opening capable of passing the thrombolytic hose is provided on the distal side wall of the outer tube.

[0021] In this optional implementation, further:

[0022] As a first optional structure, the central lumen of the outer tube serves as the lumen of the thrombolytic hose, and the proximal end of the outer tube handle is provided with a tube opening communicating with the central lumen of the outer tube as an insertion opening of the thrombolytic hose;

[0023] As a second optional structure, a thrombolytic hose cavity is further provided inside the outer tube, the distal end of the thrombolytic hose cavity is communicated with the outer tube side wall opening, and a thrombolytic hose insertion port communicated with the thrombolytic hose cavity is provided at the proximal end of the outer tube handle. Further optionally, the inner wall surface of the distal end of the thrombolytic hose cavity forms a curved surface that bends toward the outer tube side wall opening.

[0024] As a third optional structure, the distal side wall of the inner tube is provided with an inner tube side wall opening, and when the filter is fully released, the inner tube side wall opening coincides with the outer tube side wall opening, and the thrombolytic hose can penetrate into the lumen of the inner tube from the proximal end of the inner tube handle and pass out of the outer tube through the inner tube side wall opening and the outer tube side wall opening. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A schematic diagram of the overall structure of a first optional implementation of the deep vein thrombosis removal device provided in an embodiment of the present invention, when the filter is accommodated in the outer tube;

[0027] Figure 2 for Figure 1 A magnified view of the local structure of area A in the middle;

[0028] Figure 3 A schematic diagram of the overall structure of a first optional implementation of the deep vein thrombosis removal device provided in an embodiment of the present invention, when the filter is released outside the outer tube;

[0029] Figure 4 for Figure 3 A magnified view of the local structure of the middle B area;

[0030] Figure 5 A schematic diagram of the distal structure of the outer tube in a first optional implementation of the deep vein thrombosis removal device provided in an embodiment of the present invention;

[0031] Figure 6 A schematic diagram of the working state of the first optional implementation of the deep vein thrombosis removal device provided by the embodiment of the present invention after being implanted into a deep vein;

[0032] Figure 7 A schematic diagram of the overall structure of a first optional structure of a second optional implementation of a deep vein thrombosis removal device provided in an embodiment of the present invention;

[0033] Figure 8 A schematic diagram of the working state of the first optional structure of the second optional implementation mode of the deep vein thrombosis removal device provided in an embodiment of the present invention after being implanted into a deep vein;

[0034] Fig. 9 A schematic diagram of the overall structure of a second optional structure of a second optional implementation of a deep vein thrombosis removal device provided in an embodiment of the present invention;

[0035] Fig.10 for Fig. 9 A magnified view of the local structure of the middle C area;

[0036] Fig.11 A schematic diagram of the overall structure of a third optional structure of a second optional implementation of a deep vein thrombosis removal device provided in an embodiment of the present invention;

[0037] Fig.12 for Fig.11 A magnified view of the local structure of the middle D area;

[0038] Fig.13 Schematic diagram of the working state of the third optional structure of the second optional implementation scheme of the deep vein thrombosis removal device provided in an embodiment of the present invention after being implanted into a deep vein.

[0039] Icons: 1-outer tube; 11-outer tube handle; 111-plug-in buckle; 101-central tube cavity; 102-thrombolytic tube cavity; 103-liquid through hole; 104-outer tube side wall opening; 105-thrombolytic hose cavity; 106-curved surface; 2-inner tube; 21-inner tube handle; 211-support tube section; 201-inner tube side wall opening; 3-filter; 31-proximal restraint tube; 32-distal restraint tube; 33-middle hollow body; 4 -thrombolytic hose. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0041] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] It should be noted that like reference numerals and letters denote similar items in the drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0043] In the description of the present invention, it should be noted that:

[0044] Unless otherwise clearly specified and limited, the terms "disposed", "installed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a communication between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] The orientation or position relationship indicated by the terms "proximal", "distal", "front end", "rear end", "axial", "radial", "inner", "outer", etc. is based on the orientation or position relationship shown in the drawings, or is the orientation or position relationship in which the product of the invention is usually placed when used. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0046] The terms “first”, “second”, etc. are only used for distinguishing descriptions and do not indicate the total number or relative position in time and / or space, and cannot be understood as indicating or implying relative importance.

[0047] In the following, some embodiments of the present invention are described in detail with reference to the accompanying drawings, with the end of the medical device close to the operator during surgery being the proximal end of the medical device and the end of the medical device entering the patient's blood vessel being the distal end of the medical device. In the absence of conflict, the features of the following embodiments and the optional embodiments in the embodiments can be combined with each other.

[0048] This embodiment provides a deep vein thrombosis removal device, referring to Figures 1 to 13The deep vein thrombosis removal device comprises an outer tube 1, an inner tube 2 and a filter 3; the outer tube 1 is provided with a central tube cavity 101 which is axially connected to the outer tube handle 11; the inner tube 2 passes through the outer tube handle 11, and the inner tube handle 21 is fixedly connected to the proximal end of the inner tube 2 directly or through a supporting tube section 211; the filter 3 is sleeved on the outside of the inner tube 2, and the distal end of the filter 3 is fixedly connected to the inner tube 2, and the proximal end of the filter 3 is movably connected to the inner tube 2 (at least axially sliding relative to the inner tube 2, preferably both axially sliding relative to the inner tube 2 and circumferentially rotating relative to the inner tube 2), and in the released state, the filter 3 expands and unfolds along the radial direction of the inner tube 2 to form an umbrella-shaped or spindle-shaped structure with hollow areas at both the proximal and distal ends; part of the inner tube 2 and all of the filter 3 are passed through the central tube cavity 101 of the outer tube 1, the inner tube 2 has certain support and pushing properties, and the inner tube 2 and the outer tube 1 can slide relative to each other so that the outer tube 1 can accommodate or release the filter 3. In the conveying state, the proximal end of the outer tube handle 11 and the distal end of the inner tube handle 21 are away from each other. When the filter screen 3 is fully released, the proximal end of the outer tube handle 11 and the distal end of the inner tube handle 21 are fixed together.

[0049] The filter 3 is woven from nickel-titanium alloy or other metal wires, or the filter 3 is cut from a metal tube and prefabricated into an umbrella-shaped or spindle-shaped structure with a radially outward bulge in the middle, which can be retracted inside the outer tube 1 and automatically rebound into a prefabricated shape after being released from the outer tube 1. If released into a patient's blood vessel, the bulging portion will be supported by the blood vessel wall, and the proximal and distal portions will form a large hollow area for entry and interception of thrombus. Generally, it is best to have a proximal hollow area larger than the distal hollow area, so as to intercept thrombus at the distal end without hindering entry of thrombus. Optionally, as Figure 4 As shown, the filter screen 3 includes a proximal restraint tube 31, a distal restraint tube 32 and a middle hollow body 33, wherein the proximal restraint tube 31 is sleeved on the outside of the inner tube 2 and can slide axially relative to the inner tube 2 or at least can slide axially relative to the inner tube 2, and it is best to be able to slide axially relative to the inner tube 2 and rotate circumferentially relative to the inner tube 2; the distal restraint tube 32 is sleeved and fixedly connected to the distal outer wall of the inner tube 2; the proximal end of the middle hollow body 33 is fixed or integrally connected to the proximal restraint tube 31, and the distal end of the middle hollow body 33 is fixed or integrally connected to the distal restraint tube 32. After free expansion, the middle hollow body 33 can present the following Figure 4 The spindle shape shown can also be presented as a conical umbrella shape.

[0050] When using, refer to Figure 1 and Figure 2, the outer tube handle 11 is pushed forward axially relative to the inner tube handle 21 or the inner tube handle 21 is withdrawn axially relative to the outer tube handle 11 to separate the outer tube handle 11 and the inner tube handle 21, so that the filter 3 is accommodated in the outer tube 1; then the guide wire is pushed into the target blood vessel, and under the guidance of the guide wire, the distal end (front end) of the entire tube layer structure of the deep vein thrombosis removal device is pushed into the target position so that the proximal end of the filter 3 is in the thrombus area or on the downstream side of the blood flow of the thrombus (preferably on the downstream side of the blood flow of the thrombus); next, the outer tube handle 11 is pushed forward axially relative to the inner tube handle 11 to separate the outer tube handle 11 and the inner tube handle 21, so that the filter 3 is accommodated in the outer tube 1; then the guide wire is pushed into the target blood vessel, and under the guidance of the guide wire, the distal end (front end) of the entire tube layer structure of the deep vein thrombosis removal device is pushed into the target position so that the proximal end of the filter 3 is in the thrombus area or on the downstream side of the blood flow of the thrombus (preferably on the downstream side of the blood flow of the thrombus); next, Push the inner tube handle 21 forward or withdraw the outer tube handle 11 axially relative to the inner tube handle 21 so that the distal end of the inner tube handle 21 is fixed together with the proximal end of the outer tube handle 11. At this time, the filter 3 is released in the blood vessel. After the position is determined, use a medical fixing patch to fix the part of the proximal end of the outer tube 1 exposed outside the patient's body on the patient's skin to filter the embolus. During the process, since the inner tube 2 pulls the filter 3 as a positioning piece of the filter 3 after implantation, it can prevent the filter 3 from tilting or shifting, and the position and angle of the filter 3 can be adjusted at any time according to actual needs.

[0051] After the deep vein thrombosis removal device provided in this embodiment is placed in a human blood vessel, the inner tube handle 21 and the outer tube handle 11 are fixed together, and the outer tube 1 is fixed to the patient's external skin layer. Under the traction of the inner tube 2, there is no need to consider that the filter 3 will tilt or be displaced by blood flow, and there is no need to set barbs on the filter 3 for auxiliary anchoring. When the filter 3 is placed in and removed, no additional damage to the blood vessel will be caused by the presence of barbs. Moreover, since there is no barb structure, it is not easy to endothelialize after being placed in the patient's blood vessel, resulting in difficulty in removal, and thus it can be implanted for a long period of time and convenient for recovery. Therefore, this embodiment solves the technical problems in the prior art that the deep vein filter causes great damage to the blood vessel during implantation, implantation, recovery, and recovery, and is difficult to recover, and is easy to tilt during and after implantation; in addition, because the inner tube 2 pulls the filter 3, the position and angle of the filter 3 can be adjusted at any time according to different thrombus positions, so as to achieve the function of removing thrombi in multiple regions with one implant.

[0052] In order to quickly fix the outer tube handle 11 and the inner tube handle 21 together and ensure that the two can be quickly separated after fixation, optionally and preferably, a plug-in buckle 111 is provided at the proximal end of the outer tube handle 11, and a slot is provided at the distal end of the inner tube handle 21. When the filter 3 is fully released, the proximal end of the outer tube handle 11 and the distal end of the inner tube handle 21 are plugged together through the plug-in buckle 111 and the slot. The plug-in buckle 111 is preferably made of metal or memory alloy, and can also be connected to the outer tube handle 11 with a spring to improve the reliability of plug-in fixation.

[0053] In addition, optionally and preferably, a developing ring is fixed at the distal end of the outer tube 1, so that with the assistance of the developing setting, the filter 3 can be quickly and accurately released to the target position (so that the proximal end of the filter 3 is in the thrombus area or on the downstream side of the blood flow of the thrombus, preferably on the downstream side of the blood flow of the thrombus), ensuring that the filter 3 can effectively intercept more thrombi.

[0054] In addition, in order to solve the technical problem that the existing vena cava filter has a complicated and time-consuming surgical procedure, and when used with a thrombolytic device, the catheter and guide wire for delivering the filter need to be withdrawn from the body before using another deep vein thrombolytic catheter for thrombolytic treatment, the present application makes the following further improvements based on any of the above optional implementations:

[0055] In the first optional embodiment, referring to Figures 1 to 6 The outer tube 1 is also provided with a thrombolytic lumen 102 spaced apart from the central lumen 101 and closed at the distal end along the axial direction. A liquid injection hole connected to the thrombolytic lumen 102 is provided at the proximal end of the outer tube 1 or the proximal end of the outer tube handle 11, and a liquid through hole 103 connected to the thrombolytic lumen 102 is provided on the distal outer wall of the outer tube 1. When in use, after the filter 3 is completely released, the thrombolytic liquid can be introduced into the thrombolytic lumen 102 through the liquid injection hole, and the thrombolytic liquid will be injected into the blood vessel through the liquid through hole 103 to help dissolve the thrombus. After the thrombolysis and thrombus filtering are completed, the outer tube 1 is kept fixed, the inner tube handle 21 is withdrawn to recover the filter 3, and finally the device is withdrawn from the patient's body as a whole.

[0056] In this optional embodiment, further optionally, the cross-section of the thrombolytic lumen 102 along the circumference of the outer tube 1 is annular, and multiple circles of liquid through holes 103 are arranged at intervals along the axial direction of the outer tube 1. The number of each circle of liquid through holes 103 can be one, two or more, preferably two or more, and each circle of liquid through holes 103 is evenly arranged along the circumference of the outer tube 1 to fully dissolve the thrombus.

[0057] In the second optional embodiment, referring to Figures 7 to 13 The deep vein thrombosis removal device also includes a thrombolytic hose 4, and an outer tube side wall opening 104 is provided on the distal side wall of the outer tube 1, through which the thrombolytic hose 4 can pass.

[0058] In this optional implementation, further:

[0059] As a first optional structure, refer to Figure 7 and Figure 8The central lumen 101 of the outer tube 1 is used as the thrombolytic hose lumen 105 (that is, the outer tube 1 does not have any additional lumens except the central lumen 101), and the proximal end of the outer tube handle 11 is provided with a tube opening connected to the central lumen 101 of the outer tube 1 as the thrombolytic hose insertion port; when in use, after the filter 3 is completely released, the thrombolytic hose 4 is inserted into the central lumen 101 of the outer tube 1 through the thrombolytic hose insertion port, so that the distal end (front end) of the thrombolytic hose 4 passes through the opening 104 on the side wall of the outer tube into the blood vessel, and then the thrombolytic liquid is introduced into the thrombolytic hose 4 and injected into the blood vessel to help dissolve the thrombus. Under the action of the thrombolytic drug, part of the thrombus will be dissolved, and part of the thrombus will fall off. The fallen thrombus will be captured by the filter 3 along the blood flow. When the thrombus at the lesion position is completely eliminated, the outer tube 1 is kept fixed, the thrombolytic hose 4 is removed and the inner tube handle 21 is removed to recover the filter 3, and finally the device is withdrawn from the patient's body as a whole.

[0060] As a second alternative structure, refer to Fig. 9 and Fig.10 In addition to the central tube cavity 101, the outer tube 1 is provided with an additional thrombolytic hose cavity 105. The distal end of the thrombolytic hose cavity 105 is connected to the outer tube side wall opening 104. The proximal end of the outer tube handle 11 is provided with a thrombolytic hose insertion port connected to the thrombolytic hose cavity 105. When in use, after the filter 3 is completely released, the thrombolytic hose 4 is inserted into the thrombolytic hose cavity 105 of the outer tube 1 through the thrombolytic hose insertion port, so that the distal end (front end) of the thrombolytic hose 4 passes through the outer tube side wall opening 104 into the blood vessel, and then the thrombolytic liquid is introduced into the thrombolytic hose 4 and injected into the blood vessel to help dissolve the thrombus. Under the action of the thrombolytic drug, part of the thrombus will be dissolved, and part of the thrombus will fall off. The fallen thrombus will be captured by the filter 3 along the blood flow. When the thrombus at the lesion position is completely eliminated, the outer tube 1 is kept fixed, the thrombolytic hose 4 is removed and the inner tube handle 21 is withdrawn to recover the filter 3, and finally the device is withdrawn from the patient's body as a whole.

[0061] In this optional structure, it is further preferred that the distal inner wall surface of the thrombolytic hose cavity 105 forms a curved surface 106 that bends toward the side of the outer tube side wall opening 104, so as to better and faster guide the thrombolytic hose 4 to pass out. When the target blood vessel is a branch of a bifurcated blood vessel (for example, for iliofemoral vein thrombosis), this curved surface is more conducive to guiding the thrombolytic hose 4 to complete the "climbing the mountain" when passing out, and quickly and accurately enter the target branch blood vessel for thrombolysis. This structure can utilize the thrombolytic hose 4 to cooperate with the outer tube side wall opening 104 to dissolve and remove the thrombus in the branch blood vessel that is difficult for the filter 3 to be transported to, thereby reducing the burden on patients.

[0062] As a third alternative structure, refer to Figures 11 to 13, the distal side wall of the inner tube 2 is provided with an inner tube side wall opening 201, and when the filter screen 3 is fully released, the inner tube handle 21 is fixed with the outer tube handle 11 and the inner tube side wall opening 201 overlaps with the outer tube side wall opening 104, and the thrombolytic hose 4 can penetrate into the lumen of the inner tube 2 from the proximal end of the inner tube handle 21, and pass out of the outer tube 1 through the inner tube side wall opening 201 and the outer tube side wall opening 104. When in use, after the filter screen 3 is fully released, the thrombolytic hose 4 is inserted into the inner tube 2 through the thrombolytic hose insertion port, so that the distal end (front end) of the thrombolytic hose 4 passes through the inner tube side wall opening 201 and the outer tube side wall opening 104 and passes into the blood vessel, and then the thrombolytic liquid is passed into the thrombolytic hose 4 and injected into the blood vessel to help dissolve the thrombus. Under the action of thrombolytic drugs, part of the thrombus will be dissolved and part of the thrombus will fall off. The detached thrombus will be captured by the filter 3 along the blood flow. When the thrombus at the lesion site is completely eliminated, the outer tube 1 and the inner tube 2 are kept fixed, the thrombolytic hose 4 is withdrawn and removed, and the inner tube handle 21 is withdrawn to recover the filter 3, and finally the entire device is withdrawn from the patient's body.

[0063] The above-mentioned several optional implementation methods of this embodiment combine the filter thrombus filtering and thrombolysis process, and there is no need to first withdraw the catheter and guide wire of the filter delivery system from the body, and then use another deep vein thrombolysis catheter for thrombolysis treatment. The surgical procedure is simpler and more efficient. Most importantly, the thrombolysis hose 4 can cooperate with the outer tube side wall opening 104 (and the inner tube side wall opening 201) to dissolve and remove the thrombus in the branch blood vessels that are difficult for the filter 3 to reach, thereby reducing the burden on patients and achieving a more thorough thrombolysis effect.

[0064] Finally, it should be noted that the above embodiments and their optional implementation modes in this specification are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned optional implementation modes, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention. In addition, it is emphasized again that the features of the embodiments in this specification and the optional implementation modes in the embodiments can be combined with each other without conflict.

Claims

1. A deep vein thrombosis removal device, characterized in that: It comprises an outer tube (1), an inner tube (2) and a filter screen (3); The outer tube (1) is provided with a central tube cavity (101) extending therethrough in the axial direction, and an outer tube handle (11) is fixedly connected to the proximal end of the central tube cavity; The inner tube (2) passes through the outer tube handle (11), and the inner tube handle (21) is fixedly connected to the proximal end of the inner tube (2); The filter screen (3) is sleeved on the outside of the inner tube (2), and the distal end of the filter screen (3) is fixedly connected to the inner tube (2), and the proximal end is movably connected to the inner tube (2); in a released state, the filter screen (3) expands and unfolds along the radial direction of the inner tube (2) to form an umbrella-shaped or spindle-shaped structure with hollow areas at both the proximal and distal ends; part of the inner tube (2) and all of the filter screen (3) are inserted into the central tube cavity (101) of the outer tube (1), and the inner tube (2) and the outer tube (1) can slide relative to each other so that the outer tube (1) can accommodate or release the filter screen (3); In the conveying state, the proximal end of the outer tube handle (11) and the distal end of the inner tube handle (21) are separated from each other, and when the filter screen (3) is completely released, the proximal end of the outer tube handle (11) and the distal end of the inner tube handle (21) are fixed together; The deep vein thrombosis removal device further comprises a thrombolytic hose (4), and an outer tube side wall opening (104) capable of passing the thrombolytic hose (4) is provided on the distal side wall of the outer tube (1).

2. The deep vein thrombosis removal device according to claim 1, characterized in that: The filter screen (3) comprises: A proximal restraining tube (31) is sleeved on the outside of the inner tube (2) and is capable of axially sliding relative to the inner tube (2); A distal restraining tube (32) is sleeved on and fixedly connected to the distal outer wall of the inner tube (2); and a hollowed-out main body (33) in the middle, the proximal end of which is fixedly gathered or integrally connected to the proximal restraining tube (31), and the distal end of which is fixedly gathered or integrally connected to the distal restraining tube (32).

3. The deep vein thrombosis removal device according to claim 1, characterized in that: The proximal end of the outer tube handle (11) is provided with a plug-in buckle (111), and the distal end of the inner tube handle (21) is provided with a slot; when the filter (3) is in a fully released state, the proximal end of the outer tube handle (11) and the distal end of the inner tube handle (21) are plugged together via the plug-in buckle (111) and the slot.

4. The deep vein thrombosis removal device according to claim 1, characterized in that: A developing ring is fixed to the distal end of the outer tube (1).

5. The deep vein thrombosis removal device according to any one of claims 1 to 4, characterized in that: The outer tube (1) is also provided with a thrombolytic lumen (102) spaced apart from the central lumen (101) along the axial direction and closed at the distal end; a liquid injection hole communicating with the thrombolytic lumen (102) is provided at the proximal end of the outer tube (1) or the proximal end of the outer tube handle (11); and a liquid through hole (103) communicating with the thrombolytic lumen (102) is provided on the distal outer wall of the outer tube (1).

6. The deep vein thrombosis removal device according to claim 5, characterized in that: The cross-section of the thrombolytic lumen (102) along the circumference of the outer tube (1) is annular, and a plurality of circles of liquid through holes (103) are arranged at intervals along the axial direction of the outer tube (1), and each circle of liquid through holes (103) is evenly arranged along the circumference of the outer tube (1).

7. The deep vein thrombosis removal device according to claim 1, characterized in that: A thrombolytic hose cavity (105) is also provided inside the outer tube (1), the distal end of the thrombolytic hose cavity (105) is communicated with the outer tube side wall opening (104), and a thrombolytic hose insertion port communicated with the thrombolytic hose cavity (105) is provided at the proximal end of the outer tube handle (11).

8. The deep vein thrombosis removal device according to claim 7, characterized in that: The inner wall surface at the distal end of the thrombolytic hose lumen (105) forms a curved surface (106) that curves toward the side of the outer tube side wall opening (104).

9. The deep vein thrombosis removal device according to claim 1, characterized in that: The distal side wall of the inner tube (2) is provided with an inner tube side wall opening (201); when the filter screen (3) is fully released, the inner tube side wall opening (201) overlaps with the outer tube side wall opening (104); the thrombolytic hose (4) can penetrate into the lumen of the inner tube (2) from the proximal end of the inner tube handle (21) and pass out of the outer tube (1) via the inner tube side wall opening (201) and the outer tube side wall opening (104).

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