CN115670738B - Thrombolytic catheter filter and thrombolytic filter combination kit - Google Patents

Abstract

The invention provides a thrombolytic catheter filter and a thrombolytic filter combined kit, relating to the technical field of deep venous thrombosis medical equipment, and the thrombolytic catheter filter provided by the invention comprises: thrombolytic catheters and inferior vena cava filters; the thrombolysis catheter is provided with a bendable pipe section, and the thrombolysis catheter passes through the inferior vena cava filter; the inferior vena cava filter in the deployed state expands in a radial direction of the thrombolytic catheter, and the inferior vena cava filter bulges away from the concave side of the bendable section. According to the thrombolytic catheter filter and the thrombolytic filter combined kit provided by the invention, the thrombolytic catheter can be bent and extended along with a blood vessel, and the inferior vena cava filter is unfolded at an adaptive position, so that the inferior vena cava filter can be prevented from deflecting, and the inferior vena cava filter is not required to be positioned by using an expansion support of the inferior vena cava filter, thereby avoiding the technical problems of blood vessel damage caused by multiple punctures and complicated recovery operation.

Description

Thrombolytic catheter filter and thrombolytic filter combination kit

Technical Field

The invention relates to the technical field of deep venous thrombosis medical equipment, in particular to a thrombolytic catheter filter and a thrombolytic filter combined kit.

Background

Deep Vein Thrombosis (DVT) refers to the condition of a deep vein thrombosis due to various factors: for example, blood coagulates to form thrombus after trauma, fracture, long-term bed rest and the like, and the blood vessel is blocked, so that the forward blood flow is influenced, and the clinical common phenomena such as: edema of the limbs, increased continuous tension, muscular soreness, dysfunction of movement and sensation, and other related clinical discomfort symptoms. DVT patients are not actively treated effectively and are at risk of developing Pulmonary Embolism (PE). More than 90% of symptomatic pulmonary embolism comes from the lower limbs, 10% of which may be fatal attacks, acute PE attacks, and sudden death rate even reaches about 50%, which poses serious threat to the life health of patients. If thrombus remained in the venous lumen is not cleared in time, the thrombus can be induced into myogenesis in the later stage and is attached to the vascular wall, so that the closing function of the venous valve is damaged, and the venous valve closing function is not complete in the later stage.

CDT (catheterization for thrombolysis) is to use the endovascular intervention technique to insert a thrombolysis catheter directly into venous thrombosis, and then to introduce thrombolytic drugs through the catheter, so as to achieve the effect of direct thrombolysis. In the prior art, the thrombolysis and the vein filter are matched for use, so that thrombus can be prevented from falling off in the thrombolysis process, but the traditional inferior vena cava filter needs to be respectively arranged at the access of the thrombolysis catheter, the operation complexity in the access process and the further damage of the filter to the vascular wall when the filter is withdrawn from the body are increased, and the risk that the inferior vena cava filter is isolated and is easy to shift and deflect in the vena cava after being implanted is avoided.

Disclosure of Invention

The invention aims to provide a thrombolytic catheter filter and a thrombolytic filter combination kit, which are used for solving the technical problems that an inferior vena cava filter is difficult to implant and is easy to deflect after being implanted.

In a first aspect, the present invention provides a thrombolytic catheter filter comprising: thrombolytic catheters and inferior vena cava filters;

the thrombolysis catheter has a bendable tube section and passes through the inferior vena cava filter;

the inferior vena cava filter in a deployed state expands radially of the thrombolytic catheter and the inferior vena cava filter bulges away from the concave side of the bendable section.

With reference to the first aspect, the present invention provides a first possible implementation manner of the first aspect, wherein the inferior vena cava filter comprises: the net comprises a first loop, a second loop and a net bag;

the first ring sleeve and the second ring sleeve are sleeved on the thrombolytic catheter, and the first ring sleeve and the second ring sleeve are arranged at intervals along the thrombolytic catheter;

the net bag is connected between the first ring sleeve and the second ring sleeve;

the opening of the net bag in the unfolded state faces the concave side of the bendable pipe section.

In combination with the first possible implementation manner of the first aspect, the present invention provides a second possible implementation manner of the first aspect, wherein the net pockets have a tendency to elastically expand in a direction away from the axis of the thrombolytic catheter.

In combination with the first aspect, the present invention provides a third possible embodiment of the first aspect, wherein the inferior vena cava filter comprises: the device comprises a first loop, a second loop and a plurality of cage bones; the first ring sleeve and the second ring sleeve are sleeved on the thrombolytic catheter, and the first ring sleeve and the second ring sleeve are arranged at intervals along the thrombolytic catheter; many the cage bones are along the circumference interval setting of thrombolysis pipe, are in many of the state of expanding the cage bones enclose to establish and form the opening towards the chamber groove of flexible pipe section concave side.

In combination with the third possible embodiment of the first aspect, the present invention provides a fourth possible embodiment of the first aspect, wherein the cage is elastic so that the cage has a tendency to bulge away from the concave side of the bendable tube section.

In combination with the first aspect, the present invention provides a fifth possible embodiment of the first aspect, wherein the inferior vena cava filter in a deployed state decreases in size from the opening to the convex side filter pores.

In combination with the above embodiments, the present invention provides a sixth possible implementation manner of the first aspect, wherein a first limiting member is mounted on the thrombolysis catheter, and the first limiting member is located between the first loop and the second loop.

In combination with the above embodiments, the present disclosure provides a seventh possible embodiment of the first aspect, wherein the second loop is proximal to the operating end of the thrombolytic catheter, relative to the first loop; and a second limiting part is arranged on the thrombolysis catheter and used for fixing the second ring sleeve relative to the thrombolysis catheter.

In combination with the above embodiments, the present disclosure provides an eighth possible embodiment of the first aspect, wherein the second loop is proximal to the operating end of the thrombolytic catheter, relative to the first loop; a third limiting piece is arranged on the thrombolytic catheter and is positioned on one side of the second ring sleeve, which is far away from the first ring sleeve; the second ring sleeve is connected with a traction piece.

In a second aspect, the present invention provides a thrombolytic filter combination kit comprising: a sheath and the thrombolytic catheter filter of the first aspect;

the sheath is used for sleeving the thrombolytic catheter filter so that the vena cava filter radially contracts to the inside of the sheath from a deployed state.

The embodiment of the invention has the following beneficial effects: adopt the thrombolysis pipe to have the flexible pipeline section, the thrombolysis pipe passes the vena cava filter, the radial expansion of thrombolysis pipe can be followed to the vena cava filter that is in the state of expanding, and the vena cava filter is protruding to the direction that deviates from the concave side of flexible pipeline section, therefore, the thrombolysis pipe can extend along with the vascular bending, and make the vena cava filter expand in the adapted position, can avoid the vena cava filter incline, and need not to utilize the vena cava filter inflation to support and realize its location, thereby can avoid leading to retrieving the difficulty because of producing the endothelialization, and cause the technical problem of injury to the vascular wall.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the embodiments of the present invention or technical solutions in related arts, the drawings used in the description of the embodiments or related arts will be briefly described below, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic view of a thrombolytic filter combination kit according to an embodiment of the present invention;

FIG. 2 is a schematic view of a thrombolytic filter combination kit according to an embodiment of the present invention during release of the thrombolytic catheter filter;

FIG. 3 is a schematic view of a first thrombolytic catheter filter according to an embodiment of the present invention in implanted use;

FIG. 4 is a schematic view of a second thrombolytic catheter filter according to an embodiment of the present invention in implanted use;

FIG. 5 is a schematic end view of a thrombolysis catheter filter according to an embodiment of the present invention;

FIG. 6 is a schematic view of a thrombolytic catheter filter having a first stopper when releasing an inferior vena cava filter according to an embodiment of the present invention;

FIG. 7 is a schematic diagram illustrating a state of use of a thrombolytic catheter filter having a first stop member according to an embodiment of the present invention;

FIG. 8 is a schematic view of a thrombolytic catheter filter having a first stopper in accordance with an embodiment of the present invention, wherein the thrombolytic catheter filter is disposed in the second position;

FIG. 9 is a schematic view of a thrombolytic catheter filter having a second stop member according to an embodiment of the present invention in use;

FIG. 10 is a schematic view of a thrombolytic catheter filter having a third limiting member and a pull member according to an embodiment of the present invention in use;

fig. 11 is a schematic view of another thrombolytic catheter filter having a third limiting member and a pull member according to an embodiment of the present invention in use.

Icon: 100-a thrombolytic catheter; 101-a bendable pipe section; 102-an injection orifice; 200-inferior vena cava filter; 210-a first loop; 220-a second loop; 230-a net bag; 240-caged bone; 241-a first extension; 242 — a second extension; 243-a third extension; 300-plug; 310-an elastic valve; 400-sheath; 500-a first limit stop; 600-a second stop; 700-third stop; 800-pulling element.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The physical quantities in the formula, if not individually labeled, are to be understood as basic quantities of the international system of units, or derived quantities derived from the basic quantities by mathematical operations such as multiplication, division, differentiation or integration.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1, the thrombolytic catheter filter according to the embodiment of the present invention comprises: a thrombolytic catheter 100 and an inferior vena cava filter 200; the thrombolysis catheter 100 has a bendable tube section 101, and the thrombolysis catheter 100 passes through the inferior vena cava filter 200; the inferior vena cava filter 200 in the deployed state expands in the radial direction of the thrombolytic catheter 100, and the inferior vena cava filter 200 bulges away from the concave side of the bendable segment 101.

In one embodiment, the inferior vena cava filter 200 can expand radially along the thrombolytic catheter 100 under its own elastic force after release to achieve a deployed state; in another embodiment, the inferior vena cava filter 200 can also expand radially along the thrombolytic catheter 100 under the impact of the blood flow, thereby reaching a deployed state. In addition, when the bendable tube section 101 is bent to form an arc-shaped structure, the inferior vena cava filter 200 in the unfolded state is turned around the thrombolysis catheter 100 to the convex side of the bendable tube section 101, and the inferior vena cava filter 200 is limited by the bent bendable tube section 101, so that the inferior vena cava filter 200 can be prevented from being deflected.

Referring to fig. 3 and 4, when the thrombolytic catheter filter is used, the thrombolytic catheter 100 can enter from a single-side (healthy-side) femoral vein and reversely enter thrombus of another affected limb through the introduction of the mountain-turning sheath, and meanwhile, the inferior vena cava filter 200 is limited at the bifurcation of the inferior vena cava and the common iliac vein to intercept thrombus or other diseased tissues moving upwards in the thrombolytic process.

As shown in fig. 2 and 3, the inferior vena cava filter 200 comprises: a first loop 210, a second loop 220 and a net bag 230; the first loop sleeve 210 and the second loop sleeve 220 are both sleeved on the thrombolysis catheter 100, and the first loop sleeve 210 and the second loop sleeve 220 are arranged at intervals along the thrombolysis catheter 100; the string bag 230 is connected between the first loop 210 and the second loop 220; the net bag 230 in the expanded state opens toward the concave side of the bendable segment 101.

Specifically, the first collar 210 and the second collar 220 may slide along an axial direction of the thrombolytic catheter 100 and may rotate around the thrombolytic catheter 100. When the net bag 230 is deployed, the net bag 230 is restrained to the convex side of the bendable segment 101, thus preventing the inferior vena cava filter 200 from deflecting around the thrombolytic catheter 100 towards the concave side of the bendable segment 101. The net bag 230 is limited on the convex side of the bendable pipe section 101, and can better receive thrombus or other pathological tissues flowing from the concave side of the bendable pipe section 101.

Further, the net bag 230 has a tendency of elastically expanding in a direction away from the axis of the thrombolytic catheter 100, and the net bag 230 can be unfolded by itself elastically, thereby facilitating the releasing operation and better receiving the thrombus or other lesion tissues. The expanded string 230 maintains the axis of the first loop 210 at an angle to the axis of the second loop 220, and the string 230 is retained on the convex side of the bendable segment 101 when the bendable segment 101 is bent, thereby ensuring a fixed circumferential position of the inferior vena cava filter 200 relative to the thrombolytic catheter 100.

As shown in fig. 1 and 4, the inferior vena cava filter 200 comprises: a first ring sleeve 210, a second ring sleeve 220 and a plurality of cage ribs 240; the first loop 210 and the second loop 220 are both sleeved on the thrombolysis catheter 100, and the first loop 210 and the second loop 220 are arranged at intervals along the thrombolysis catheter 100; a plurality of cage bones 240 are arranged at intervals along the circumference of the thrombolysis catheter 100, and a cavity groove with an opening facing the concave side of the bendable pipe section 101 is formed by surrounding the plurality of cage bones 240 in an unfolded state.

Specifically, the plurality of cage bars 240 are located on the convex side of the flexible pipe section 101, and the plurality of cage bars 240 surround the central angle of the cavity groove corresponding to any tangent plane perpendicular to the flexible pipe section 101, which is greater than or equal to 180 degrees and smaller than 360 degrees, so that the opening of the cavity groove is located on the concave side of the flexible pipe section 101, thrombus or other pathological tissues can enter the cavity groove through the opening, blood can be discharged through the gap between two adjacent cage bars 240, and the thrombus or other pathological tissues can stay in the cavity groove under the blocking effect of the plurality of cage bars 240.

Further, the cage 240 includes: a first extension 241, a second extension 242, and a third extension 243; the first extension part 241, the second extension part 242 and the third extension part 243 are sequentially connected end to end, one end of the first extension part 241, which is far away from the second extension part 242, is connected with the first ring sleeve 210, and one end of the third extension part 243, which is far away from the second extension part 242, is connected with the second ring sleeve 220; in the direction in which the concave side of the bendable pipe section 101 points to the convex side, the distance between the first extension 241 and the third extension 243 decreases.

Specifically, the first extension portion 241, the second extension portion 242 and the third extension portion 243 together form a trapezoid structure, the second extension portion 242 serves as an upper bottom of the trapezoid, and two vertex angles of the trapezoid structure are respectively abutted against the inner wall of the blood vessel at the bifurcation of the blood vessel, so that the inferior vena cava filter 200 can be fixed relative to the bifurcation of the blood vessel. In addition, by the first extension portion 241 and the third extension portion 243 together supporting the second extension portion 242, the structural stability of the inferior vena cava filter 200 in the deployed state can be ensured. Furthermore, the angle between the third extension part 243 and the bendable pipe section 101 is less than 90 degrees, so that the inferior vena cava filter 200 can be smoothly inserted into the sheath 400 when the thrombolytic catheter filter is recovered.

Further, the cage 240 is resilient such that the cage 240 has a tendency to bulge away from the concave side of the bendable tube section 101. The cage bones 240 can be unfolded quickly by utilizing the elasticity of the cage bones, the blood impact force is not required to drive the cage bones 240 to unfold, and the reliability of the inferior vena cava filter 200 is improved. When the cage 240 is rebounded and the plurality of cages 240 are expanded, the axis of the first ring 210 and the axis of the second ring 220 are at a certain angle, and when the bendable pipe segment 101 is bent, the plurality of cages 240 are retained on the convex side of the bendable pipe segment 101, thereby securing the circumferential position of the inferior vena cava filter 200 relative to the thrombolytic catheter 100.

As shown in fig. 1, 2, 3 and 4, the inferior vena cava filter 200 in the deployed state decreases in size from the opening to the convex side filter pores. Wherein, the filtration pores comprise the meshes of the net bag 230, and the filtration pores further comprise the clearance area between any two adjacent cages 240. After implantation, the filter pores are tapered in size in the direction of blood flow, thereby allowing thrombus to be retained within the inferior vena cava filter 200.

Further, the injection section of the thrombolytic catheter 100 is provided with a plurality of injection holes 102, and the plurality of injection holes 102 are spaced apart. Wherein the plurality of injection holes 102 are arranged at intervals along the circumferential direction and the axial direction of the thrombolysis catheter 100, the plurality of injection holes 102 are positioned at a position close to the plug 300, and the thrombolysis agent injected into the thrombolysis catheter 100 can be injected to a lesion position through the plurality of injection holes 102 so as to enable thrombus to be dispersed and flow with fluid to the inferior vena cava filter 200. In addition, the thrombolytic catheter 100 can infuse thrombolytic drugs, which can be injected into a lesion site or the interior of the inferior vena cava filter 200 through the plurality of injection holes 102, thereby dissolving thrombus and preventing the thrombus from being difficult to recover due to its excessively large size.

When the thrombolysis catheter 100 is inserted from the healthy side of the femoral vein during implantation operation, the thrombolysis catheter 100 is bent when crossing the iliac veins on both sides, and at this time, both the net bag 230 and the cage bone 240 can be expanded towards the inferior vena cava side, and both the net bag 230 and the cage bone 240 can abut against the inner wall of the inferior vena cava, thereby realizing the position fixation of the inferior vena cava filter 200. In an alternative embodiment, the first collar 210 and the second collar 220 are both free to rotate around the thrombolytic catheter 100, and the inferior vena cava filter 200 can be clamped in the inferior vena cava under the impact of blood flow to achieve a fixed position. The thrombolysis catheter 100 can move freely along the axial direction of the catheter relative to the inferior vena cava filter 200, and the action position of the injection hole 102 on the thrombolysis catheter 100 can be adjusted.

In the embodiment shown in fig. 6, 7 and 8, a first retaining member 500 is mounted on the thrombolysis catheter 100, and the first retaining member 500 is located between the first loop 210 and the second loop 220. The first position-limiting member 500 may be a snap ring or a snap block, and when the thrombolysis catheter 100 is pushed or pulled, the first position-limiting member 500 reciprocates between the first ring sleeve 210 and the second ring sleeve 220, thereby ensuring that the position of the thrombolysis catheter 100 can be adjusted. Referring to fig. 6, when the inferior vena cava filter 200 is released, the first stopper 500 abuts against the first loop 210, and the operation sheath 400 is retracted towards the operation end or the proximal end, so that the first loop 210 is stopped by the first stopper 500, thereby ensuring the stable position of the inferior vena cava filter 200 during the releasing process. Referring to fig. 7 and 8, pulling back the thrombolytic catheter 100 can make the first position-limiting member 500 abut against the second loop 220, and then the sheath 400 is delivered to the distal end, so that the sheath 400 can be sleeved on the inferior vena cava filter 200, thereby recovering the inferior vena cava filter 200.

In the embodiment shown in fig. 9, the second collar 220 is proximal to the operative end of the thrombolytic catheter 100 relative to the first collar 210; the thrombolysis catheter 100 is provided with a second stopper 600, and the second stopper 600 is used for fixing the second collar 220 relative to the thrombolysis catheter 100. The second limiting member 600 may be a limiting snap ring or a limiting protrusion, and two ends of the second collar 220 are both abutted against the limiting snap ring or the limiting protrusion; a bonding substance filled between the second collar 220 and the thrombolytic catheter 100 may also be used for fixing the second collar 220 relative to the thrombolytic catheter 100. When the inferior vena cava filter 200 is released, the thrombolytic catheter 100 is kept fixed, so that the second loop 220 can be ensured to be stable through the second limiting member 600; when the inferior vena cava filter 200 is recovered, the thrombolytic catheter 100 is pulled back, the second ring sleeve 220 is driven by the second limiting member 600, and the inferior vena cava filter 200 can be pulled into the sheath 400, as shown in fig. 2.

In the embodiment shown in fig. 10 and 11, the second collar 220 is proximal to the operative end of the thrombolytic catheter 100 relative to the first collar 210; the thrombolytic catheter 100 is provided with a third limiting member 700, and the third limiting member 700 is positioned at one side of the second ring sleeve 220 departing from the first ring sleeve 210; a pull 800 is attached to the second collar 220. The third retaining member 700 may abut against the proximal end of the second collar 220, so that the thrombolytic catheter 100 still has a degree of freedom of being pulled back proximally. When the inferior vena cava filter 200 is released, the third stopper 700 abuts against the second collar 220, thereby maintaining the position of the inferior vena cava filter 200 stable. The pulling member 800 is a hook, a fastener or a drawn wire connected to the second loop 220, preferably a drawn wire extending from the second loop 220 along the thrombolytic catheter 100 to the operation end, and when the inferior vena cava filter 200 needs to be recovered, the second loop 220 is pulled back by the pulling member 800, so that the inferior vena cava filter 200 can be pulled into the sheath 400, as shown in fig. 2.

As shown in fig. 1 and 5, the end of the injection section of the thrombolysis catheter 100 is provided with a plug 300, and the end of the thrombolysis catheter 100 is sealed by the plug 300, so that the thrombolysis reagent can only be ejected and discharged through the injection hole 102, and the injection pressure of the medicinal reagent ejected from the injection hole 102 is ensured to meet the medical requirement.

Further, the plug 300 comprises a plurality of elastic valves 310, the plurality of elastic valves 310 are distributed around the axis of the injection section of the thrombolytic catheter 100, and the plurality of elastic valves 310 are all connected to the end of the injection section of the thrombolytic catheter 100; the plurality of resilient valves 310 have a tendency to remain occluding the end of the injection section of the thrombolytic catheter 100.

A guidewire may be passed through the thrombolytic catheter 100, and the guidewire may be capable of spreading the plurality of elastic valves 310 apart such that the guidewire extends to the front end of the thrombolytic catheter 100. At this time, the plurality of elastic valves 310 are elastically restored to be closely attached to the guide wire, and thus, the pressure of the medicinal agent inside the thrombolytic catheter 100 can be maintained without interfering with the insertion of the guide wire.

As shown in fig. 1 and 2, a thrombolytic filter combination kit according to an embodiment of the present invention includes: the sheath 400 and the thrombolytic catheter filter according to the above embodiment; the sheath 400 is configured to receive the thrombolytic catheter filter such that the inferior vena cava filter 200 is radially collapsed from the expanded state into the sheath 400.

In an embodiment of the present invention, the sheath 400 includes an outer sheath body and an inner tube or locking device mounted inside the outer sheath body. The inner tube is used for abutting against the inferior vena cava filter 200, and when the sheath tube body is retracted, the inferior vena cava filter 200 can be exposed from the interior of the sheath tube body, so that the release of the inferior vena cava filter 200 is realized; the locking device may be clamped or clipped to lock the inferior vena cava filter 200 relative to the guidewire or thrombolytic catheter 100, and then the outer sheath body is withdrawn to release the inferior vena cava filter 200. When the inferior vena cava filter 200 is to be recovered, the inferior vena cava filter 200 is fitted to the outer sheath body, in other words, the inferior vena cava filter 200 is pulled and inserted into the outer sheath body, so that the inferior vena cava filter 200 can be radially compressed and contracted to the inside of the outer sheath body, thereby recovering the thrombolytic catheter filter.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (12)

1. A thrombolytic catheter filter, comprising: a thrombolytic catheter (100) and an inferior vena cava filter (200);

the thrombolysis catheter (100) has a bendable tube section (101) and the thrombolysis catheter (100) passes through the inferior vena cava filter (200);

the inferior vena cava filter (200) comprising: a first ring sleeve (210), a second ring sleeve (220) and a net bag (230);

the first loop sleeve (210) and the second loop sleeve (220) are sleeved on the thrombolytic catheter (100), and the first loop sleeve (210) and the second loop sleeve (220) are arranged at intervals along the thrombolytic catheter (100);

the net bag (230) is connected between the first loop (210) and the second loop (220);

the opening of the net bag (230) in the expanded state faces the concave side of the bendable pipe section (101);

the net bag (230) has the tendency of elastically expanding in the direction away from the axis of the thrombolytic catheter (100), and the inferior vena cava filter (200) is expanded and unfolded along the radial direction of the thrombolytic catheter (100), and the inferior vena cava filter (200) is convex in the direction away from the concave side of the bendable pipe section (101).

2. The thrombolytic catheter filter of claim 1, wherein the inferior vena cava filter (200) in a deployed state decreases in size from the opening to the convex lateral filtering pores.

3. The thrombolytic catheter filter of claim 1, wherein a first stop (500) is mounted to the thrombolytic catheter (100), the first stop (500) being located between the first loop (210) and the second loop (220).

4. The thrombolytic catheter filter of claim 1, wherein the second collar (220) is proximal to an operational end of the thrombolytic catheter (100) relative to the first collar (210);

the thrombolysis catheter (100) is provided with a second limiting piece (600), and the second limiting piece (600) is used for fixing the second ring sleeve (220) relative to the thrombolysis catheter (100).

5. The thrombolytic catheter filter of claim 1, wherein the second collar (220) is proximal to an operational end of the thrombolytic catheter (100) relative to the first collar (210);

a third limiting piece (700) is mounted on the thrombolytic catheter (100), and the third limiting piece (700) is positioned on one side of the second ring sleeve (220) departing from the first ring sleeve (210);

the second ring sleeve (220) is connected with a traction piece (800).

6. A thrombolytic filter combination kit, comprising: a sheath (400) and the thrombolytic catheter filter of any one of claims 1-5;

the sheath (400) is used for sleeving the thrombolytic catheter filter so as to enable the inferior vena cava filter (200) to radially contract to the inside of the sheath (400) from a deployed state.

7. A thrombolytic catheter filter, comprising: a thrombolytic catheter (100) and an inferior vena cava filter (200);

the thrombolysis catheter (100) has a bendable tube section (101) and the thrombolysis catheter (100) passes through the inferior vena cava filter (200);

the inferior vena cava filter (200) comprising: a first ring sleeve (210), a second ring sleeve (220) and a plurality of cage bones (240);

the first loop sleeve (210) and the second loop sleeve (220) are sleeved on the thrombolytic catheter (100), and the first loop sleeve (210) and the second loop sleeve (220) are arranged at intervals along the thrombolytic catheter (100);

the plurality of cage bones (240) are arranged at intervals along the circumference of the thrombolytic catheter (100), and cavity grooves with openings facing the concave side of the bendable pipe section (101) are formed by surrounding the plurality of cage bones (240) in the unfolding state;

the cage bone (240) is elastic, so that the cage bone (240) has a tendency of protruding away from the concave side of the bendable pipe section (101), the inferior vena cava filter (200) expands and expands along the radial direction of the thrombolytic catheter (100), and the inferior vena cava filter (200) protrudes away from the concave side of the bendable pipe section (101).

8. The thrombolytic catheter filter of claim 7, wherein the inferior vena cava filter (200) in a deployed state decreases in size from the opening to the convex lateral filtering pores.

9. The thrombolytic catheter filter of claim 7, wherein the thrombolytic catheter (100) is provided with a first stop (500), the first stop (500) being located between the first collar (210) and the second collar (220).

10. The thrombolytic catheter filter of claim 7, wherein the second collar (220) is proximal to an operational end of the thrombolytic catheter (100) relative to the first collar (210);

the thrombolysis catheter (100) is provided with a second limiting piece (600), and the second limiting piece (600) is used for fixing the second ring sleeve (220) relative to the thrombolysis catheter (100).

11. The thrombolytic catheter filter of claim 7, wherein the second collar (220) is proximal to an operational end of the thrombolytic catheter (100) relative to the first collar (210);

a third limiting piece (700) is mounted on the thrombolytic catheter (100), and the third limiting piece (700) is positioned on one side of the second ring sleeve (220) departing from the first ring sleeve (210);

the second ring sleeve (220) is connected with a traction piece (800).

12. A thrombolytic filter combination kit, comprising: a sheath (400) and a thrombolytic catheter filter according to any of claims 7-11;

the sheath (400) is used for sleeving the thrombolytic catheter filter so as to enable the inferior vena cava filter (200) to radially contract to the inside of the sheath (400) from a deployed state.

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