Bolt filter

Abstract

The application provides a filter for breaking up thrombus. The filter comprises a power conversion mechanism, a filter support and a cutting mechanism which are connected in sequence along an axial direction and can be radially expanded and contracted; the power conversion mechanism and the cutting mechanism are axially limited and can rotate circumferentially relative to the filter support; the power conversion mechanism can convert the power of blood flow flowing from the cutting mechanism to the power conversion mechanism into rotary motion and can drive the cutting mechanism to rotate circumferentially in the filter support. According to the embodiment of the application, the cutting mechanism is driven by the power conversion mechanism to rotate circumferentially in the filter support, so that the thrombus intercepted in the filter support can be continuously cut and broken up, thereby avoiding pulmonary embolism and preventing blood vessel embolism caused by the filter for breaking up thrombus.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a thrombus crushing filter. BACKGROUND

[0002] With the aging of blood vessels, lower limb venous thrombosis is most likely to occur. After the thrombus falls off, it enters the pulmonary artery via the inferior vena cava, causing pulmonary embolism. Because pulmonary embolism occurs quickly and the treatment time is short, it is extremely easy to cause death.

[0003] In the thrombus removal operation of the lower or upper limb, in order to prevent pulmonary embolism, a filter is usually placed in the inferior vena cava or superior vena cava to collect the falling thrombus. The existing thrombus filter can only intercept thrombus, and if the thrombus is too large, it may also cause thrombus embolism of the lower limb vein. SUMMARY

[0004] The purpose of the embodiment of the present application is to provide a thrombus crushing filter which can not only filter and intercept thrombus to avoid pulmonary embolism, but also crush large thrombus to prevent local vascular embolism.

[0005] To solve the above technical problems, the embodiment of the present application provides a thrombus crushing filter, comprising: a power conversion mechanism, a thrombus support and a cutting mechanism which are connected in sequence along the axial direction and can be radially expanded and contracted; the power conversion mechanism and the cutting mechanism are axially limited relative to the thrombus support and can rotate relative to the thrombus support in the circumferential direction.

[0006] The power conversion mechanism can convert the power of the blood flow flowing from the cutting mechanism to the power conversion mechanism into rotary motion and can drive the cutting mechanism to rotate in the circumferential direction in the thrombus support.

[0007] As an embodiment, the power conversion mechanism comprises a rotating shaft and a plurality of blades, and the plurality of blades are arranged radially around the rotating shaft.

[0008] As an embodiment, the blade comprises a rotating rod and a blade part, one end of the rotating rod is connected with the rotating shaft, and the other end is connected with the blade part.

[0009] Optionally, the blade part comprises a blade frame and a blade film, and the blade film is arranged in the blade frame to form the blade part.

[0010] Optionally, the blade part can be folded and unfolded relative to the rotating rod.

[0011] Optionally, the blade part is in the shape of a triangle, a circle, a sector or an ellipse.

[0012] Optionally, the rotating rod is in the shape of a straight rod or an arc-shaped rod.

[0013] As an embodiment, the filter further comprises a recovery mechanism connected to the proximal end of the power conversion mechanism.

[0014] Optionally, the recovery mechanism comprises a plurality of recovery rods and a recovery hook.

[0015] The distal ends of the plurality of recovery rods are connected to the proximal ends of the plurality of blades respectively and capable of controlling the radial contraction of the plurality of blades, and the proximal ends of the plurality of recovery rods are connected to the recovery hook respectively.

[0016] As an embodiment, the cutting mechanism comprises a transmission member and at least one cutting structure connected to the transmission member, and the cutting structure is capable of radial expansion and contraction.

[0017] Optionally, the cutting structure is a plurality of cutting structures, and the plurality of cutting structures are arranged radially around the filter axis; the transmission member is connected to the power conversion mechanism and capable of rotating with the power conversion mechanism.

[0018] As an embodiment, the cutting structure comprises a cutting rod and a cutting part, and the two ends of the cutting rod are connected to the transmission member and the cutting part respectively.

[0019] Optionally, the cutting part is in any one of the following shapes: triangular, fan-shaped, rod-shaped or circular.

[0020] Optionally, the cutting rod is an equal-diameter round rod or a stepped round rod, or the cutting rod is a flat rod.

[0021] Optionally, the cutting part comprises a body and a blade part connected to each other; optionally, the blade part and the body are integrally formed or the blade part and the body are connected by welding.

[0022] As an embodiment, the filter stent comprises a connecting shaft and a plurality of filter rods.

[0023] The plurality of filter rods are arranged radially around the connecting shaft; the connecting shaft is rotatably connected to the power conversion mechanism and the cutting mechanism; the plurality of filter rods are capable of radial expansion and contraction.

[0024] As an embodiment, the end of the filter rod is provided with an anchoring part.

[0025] Optionally, the filter rod is a straight rod or an arc-shaped rod.

[0026] As an embodiment, the power conversion mechanism comprises a rotating shaft, the filter stent comprises a connecting shaft, and the cutting mechanism comprises a transmission member.

[0027] The rotating shaft is connected with the transmission member, and the connecting shaft is movably sleeved on the rotating shaft.

[0028] As an embodiment, the transmission ratio between the cutting mechanism and the power conversion mechanism is equal to 1 or greater than 1.

[0029] From the above technical solution, the present application has at least the following advantages and positive effects:

[0030] In the thrombus filter of the embodiment of the present application, the thrombus is intercepted by the filter support, and the power of the blood flow from the cutting mechanism to the power conversion mechanism is converted into rotating motion by the power conversion mechanism and drives the cutting mechanism to rotate circumferentially in the filter support, so that the thrombus in the filter support can be continuously cut and broken, which not only prevents pulmonary embolism but also avoids local thrombus embolism. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. It can be understood that the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by the provided drawings without creative labor for those skilled in the art.

[0032] Figure 1 The three-dimensional structural schematic diagram of the thrombus filter provided by the embodiment of the present application is shown in the figure.

[0033] Figure 2 The front view of the figure is shown in the figure. Figure 1

[0034] The three-dimensional structural schematic diagram of the cutting mechanism of the thrombus filter provided by the embodiment of the present application is shown in the figure. Figure 3a

[0035] The front view of the figure is shown in the figure. Figure 3b Figure 3a The top view of the figure is shown in the figure.

[0036] Figure 3c Figure 3b The three-dimensional structural schematic diagram of the power conversion mechanism of the thrombus filter provided by the embodiment of the present application is shown in the figure.

[0037] Figures 4a to 4c The structural schematic diagram of the cutting part of the thrombus filter provided by the embodiment of the present application is shown in the figure.

[0038] Figure 5a The three-dimensional structural schematic diagram of the power conversion mechanism of the thrombus filter provided by the embodiment of the present application is shown in the figure.

[0039] Figure 5b The front view of the figure is shown in the figure. Figure 5a

[0040] Figure 5c ​​​Fig. 1 is a perspective view of a thrombus filter according to an embodiment of the present application; Figure 5b Fig. 2 is a top view of the thrombus filter according to the embodiment of the present application;

[0041] Figure 6 Fig. 3 is a schematic view of a recovery mechanism of the thrombus filter according to the embodiment of the present application. DETAILED DESCRIPTION

[0042] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the embodiments of the present application will be described in detail below with reference to the drawings. However, those skilled in the art can understand that, in the embodiments of the present application, many technical details are presented in order to make the readers better understand the present application. However, the technical solutions claimed by the present application can be implemented even without these technical details and based on various changes and modifications of the following embodiments.

[0043] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0044] It should be noted that, unless otherwise explicitly specified, the terms "connected", "connected" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be connected inside two elements.

[0045] In the description of the present application, it should be noted that, in the field of interventional medical devices, the proximal end refers to the end closer to the operator, and the distal end refers to the end farther from the operator; the axial direction refers to the direction parallel to the center line connecting the distal end center and the proximal end center of the medical device in the natural state. The above definition is only for the convenience of description and cannot be understood as a limitation on the present application.

[0046] Referring to Figs. 1 to 3, Figure 1 , Figure 2 The present embodiment provides a thrombus filter which can be placed in the inferior vena cava or similar position, used for intercepting and filtering and breaking the intercepted thrombus, not only can effectively prevent pulmonary embolism but also can avoid thrombus filter blockage causing vascular embolism. The thrombus filter of the present embodiment mainly comprises a power conversion mechanism 1 capable of radial expansion and contraction, a filter thrombus stent 3 and a cutting mechanism 2.

[0047] The power conversion mechanism 1, the filter stent 3 and the cutting mechanism 2 are connected in sequence along the axial direction, and the power conversion mechanism 1 and the cutting mechanism 2 are axially limited relative to the filter stent 3 and can rotate relative to the filter stent 3 in the circumferential direction. The power conversion mechanism 1 can convert the power of the blood flow flowing from the cutting mechanism 2 to the power conversion mechanism 1 into rotary motion and can drive the cutting mechanism 2 to rotate in the circumferential direction in the filter stent 3.

[0048] The power conversion mechanism 1, the filter stent 3 and the cutting mechanism 2 can be accommodated in a delivery device in a contracted state and delivered to a target blood vessel position by the delivery device. When the filter stent is released and placed in the target blood vessel position, for example, in the inferior vena cava, the power conversion mechanism 1, the filter stent 3 and the cutting mechanism 2 all radially expand by relying on their own elastic properties. At this time, the filter stent 3 can be anchored to the inner wall of the blood vessel, so that the entire filter stent is fixed at a specific position in the blood vessel. The filter stent 3 has a gap, the gap of the filter stent 3 can pass through the blood flow, and the filter stent 3 can filter and intercept thrombus, preventing larger thrombus from entering the pulmonary artery to cause pulmonary embolism. When the blood flow flows from the cutting mechanism 2 to the power conversion mechanism 1, the power conversion mechanism 1 can convert the power of the blood flow acting on it into rotary power, thereby driving the power conversion mechanism 1 and the cutting mechanism 2 to rotate relative to the filter stent 3 in the circumferential direction. When the cutting mechanism 2 rotates in the circumferential direction in the filter stent 3, it can continuously cut and break the thrombus intercepted in the filter stent 3, until the broken thrombus can flow away through the gap of the filter stent 3, thereby preventing large thrombus in the filter stent 3 from causing vascular embolism.

[0049] The power conversion mechanism 1 can include a rotating shaft, the filter stent 3 can include a connecting shaft, and the cutting mechanism 2 can include a transmission member. The rotating shaft is connected to the transmission member, so that the power conversion mechanism 1 can drive the cutting mechanism 2 to rotate. The connecting shaft is movably sleeved on the rotating shaft and can be axially limited relative to the rotating shaft, so that the power conversion mechanism 1 and the cutting mechanism 2 can be positioned in the blood vessel by the filter stent and can rotate relative to the filter stent 3. The transmission ratio between the cutting mechanism 2 and the power conversion mechanism 1 can be equal to 1, at which time the cutting mechanism 2 and the power conversion mechanism 1 have the same rotational speed. Alternatively, the transmission ratio between the cutting mechanism 2 and the power conversion mechanism 1 can be greater than 1, for example, the transmission ratio can be equal to 2, at which time the cutting mechanism 2 rotates faster than the power conversion mechanism 1, thereby better cutting and breaking the thrombus. When the transmission ratio is 1, the rotating shaft of the power conversion mechanism 1 and the transmission member of the cutting mechanism 2 rotate synchronously, and the transmission member can be an axial component with the same diameter as the rotating shaft or a smaller diameter. When the transmission ratio is not 1, the transmission member can adopt a pinion or other transmission mode to achieve the designed transmission ratio. The present embodiment does not specifically limit the transmission structure and the size of the transmission ratio between the cutting mechanism 2 and the power conversion mechanism 1.

[0050] Please refer to Figures 3a to 3c and Figures 4a to 4cAs shown, the cutting mechanism 2 can include a transmission member 21 and at least one cutting structure 22. The at least one cutting structure 22 is connected to the transmission member 21.

[0051] The transmission member 21 is connected to the power conversion mechanism 1 and can rotate with the power conversion mechanism 1. The transmission ratio between the transmission member 21 and the power conversion mechanism 1 can be 1 or less than 1.

[0052] Exemplarily, the cutting structure 22 can be multiple, and the multiple cutting structures 22 are respectively connected to the transmission member 21 and arranged radially around the filter stent axis. The opening of the umbrella-shaped structure formed by the multiple cutting structures 22 after the expansion of the cutting mechanism 2 faces the distal end. In the embodiment, the cutting structure 22 can be four, and the four cutting structures are uniformly spaced along the circumference of the transmission member 21. It can be understood that the cutting structure 22 can also be one, two, three or more. When the cutting structure is multiple, the multiple cutting structures are preferably uniformly distributed along the circumference, and of course the multiple cutting structures can also be unevenly distributed along the circumference. The number and distribution mode of the cutting structure are not limited in the embodiment.

[0053] The cutting structure 22 can expand and contract in the radial direction. The multiple cutting structures 22 can be accommodated in a delivery device (not shown) when they contract in the radial direction, and the multiple cutting structures 22 can be uniformly distributed in the internal space of the radially expanded filter stent 3 after they expand in the radial direction, so that each cutting structure 22 can continuously cut and break the thrombus in the filter stent 3 when the cutting mechanism rotates.

[0054] The cutting structure 22 can include a cutting rod 221 and a cutting part 222, and the two ends of the cutting rod 221 are respectively connected to the transmission member 21 and the cutting part 222. It can be understood that the shapes and sizes of the multiple cutting structures 22 can be the same or different.

[0055] The cutting part 222 can include a body and a blade part connected together. The blade part and the body can be an integral structure, for example, the edge of the body can be die-cut to form a thin blade. Or the blade part and the body are connected by welding, that is, the blade part is separately made and then combined with the body to form an integral structure. It can be understood that the cutting part 222 can also not contain the blade part, in which case the cutting rod in the form of a thin wire is directly used to cut the thrombus.

[0056] The cutting part 222 can have any of the following shapes: triangular, fan-shaped, rod-shaped or circular. The triangular shape can be a right-angled triangle, an acute-angled triangle, etc.

[0057] The cutting rod 221 is used to transmit the rotating cutting force. The cutting rod 221 can be a straight rod or an arc-shaped rod. The cutting rod 221 can be a constant-diameter circular rod or a stepped circular rod, or the cutting rod 221 can also be a flat rod.

[0058] The diameter of the cutting mechanism 22 can be smaller than the diameter of the power conversion mechanism 1 to reduce the resistance when the cutting mechanism rotates to cut. However, the diameter of the cutting mechanism 22 can also be larger than the diameter of the power conversion mechanism 1 when the overall cutting resistance of the cutting mechanism 22 is small.

[0059] The cutting mechanism 22 can be made of a shape memory alloy. It can be understood that the structure of the cutting mechanism 2 is not specifically limited in the embodiment, as long as it can effectively break the thrombus in the filter stent 3.

[0060] Please refer to Figures 4a to 4c As shown in the figure, the power conversion mechanism 1 can include a rotating shaft 11 and a plurality of blades 12. The plurality of blades 12 are arranged radially around the rotating shaft 11. The opening of the umbrella-shaped structure formed by the plurality of blades 12 after the power conversion mechanism 1 is deployed faces the proximal end.

[0061] The blade 12 can include a rotating rod 121 and a blade part 122, one end of the rotating rod 121 is connected to the rotating shaft 11, and the other end is connected to the blade part 122. The blade part 122 of each blade 12 is used to act on the blood flow and convert the blood flow power into rotational motion. The shape of the blade part 122 can be designed according to the characteristics of the blood flow power, so that it can rotate efficiently under the drive of the blood flow. The shape, size and number of the blades are not specifically limited in the embodiment.

[0062] For example, the blade part 122 can include a blade frame 1221 and a blade film 1222. The blade film 1222 is arranged in the blade frame 1221 to form the blade part 122. The blade film 1222 can be made of light, hydrophobic and blood-repellent medical plastic and other materials, which is beneficial to reduce the mass of the power conversion mechanism 1. The blade part 122 can be folded and unfolded relative to the rotating rod 121, that is, the blade frame 1221 and the blade film 1222 can be folded and unfolded relative to the rotating rod 121. When the blade part 122 is in a folded state, the broken thrombus filter can be conveniently accommodated in the delivery device, and when the blade part 122 is unfolded, the blood flow power can be converted into rotational motion.

[0063] The blade part 122 can be in the shape of a triangle, a circle, a sector, an ellipse or other suitable shapes. The rotating rod 121 can be in the shape of a straight rod, an arc-shaped rod or other suitable shapes.

[0064] Please continue to refer to Figure 1 As shown in the figure, the filter stent 3 can include a connecting shaft 31 and a plurality of filter rods 32. The plurality of filter rods 32 are arranged radially around the connecting shaft 31. The opening of the umbrella-shaped structure formed by the plurality of filter rods 32 after the filter stent 3 is deployed faces the distal end.

[0065] The connecting shaft 31 is rotatably connected with the power conversion mechanism 1 and the cutting mechanism 2, so that the power conversion mechanism 1 and the cutting mechanism 2 can freely rotate when the embolus filter is anchored in the blood vessel.

[0066] The plurality of filter rods 32 can be radially expanded and contracted, so as to be accommodated in the delivery device for delivery.

[0067] The end of the filter rod 32 can be provided with an anchoring part, which facilitates anchoring the embolus filter to the inner wall of the blood vessel. The anchoring part can be one or more barbs. The filter rod 32 can be a straight rod or an arc-shaped rod. The number and arrangement of the filter rods 32 can be set according to the size of the embolus to be intercepted, which is not specifically limited herein. It can be understood that the structure of the embolus filter 3 is not specifically limited in this embodiment, as long as it can intercept the embolus and smoothly pass through the blood flow.

[0068] The above-mentioned embolus filter can be implanted in the human body for a long time. As an alternative, the embolus filter can also include a recovery mechanism, so as to facilitate the recovery of the embolus filter.

[0069] Please refer to Figure 6 The embolus filter can also include a recovery mechanism 4 connected to the proximal end of the power conversion mechanism 1. Through the recovery mechanism 4, the embolus filter can be accommodated in the delivery device and withdrawn out of the body.

[0070] The recovery mechanism 4 can include a plurality of recovery rods 42 and a recovery hook 41. The distal ends of the plurality of recovery rods 42 are respectively connected to the proximal ends of the plurality of blades 12 of the power conversion mechanism 1 and can control the radial contraction of the plurality of blades 12. The proximal ends of the plurality of recovery rods 42 are respectively connected to the recovery hook 41. When the recovery hook 41 is pulled proximally, the recovery rod 42 pulls each blade 12 to contract radially and be accommodated in the delivery device. Since the embolus filter 3 and the cutting mechanism 2 can be radially contracted, the embolus filter 3 and the cutting mechanism 2 can also conform to the radial pressure of the delivery device and be accommodated in the delivery device, so that the embolus filter as a whole is again accommodated in the delivery device.

[0071] Please refer to Figure 1 The use method of the embolus filter of the present embodiment is as follows:

[0072] The broken plug filter is loaded into a catheter and delivered to the inferior vena cava or the like by an interventional method. Then the catheter is withdrawn to release the broken plug filter into the blood vessel. The filter stent 3 is directly fixed on the blood vessel after expansion. The cutting mechanism 2 and the power conversion mechanism 1 are automatically expanded and unfolded. The power conversion mechanism 1 continuously rotates under the action of blood flow, thereby continuously rotating the cutting mechanism in the filter stent 3 in the circumferential direction and continuously cutting and breaking the large clots intercepted in the filter stent 3. When the broken clots are small enough, they can flow away through the gaps of the filter stent 3. The larger clots are impacted to the position of the cutting structure under the action of blood flow and are cut and broken again by the cutting structure until no large clots exist.

[0073] Based on the above technical solution, the present application has at least the following advantages and positive effects:

[0074] In the broken plug filter of the embodiment of the present application, the thrombus is intercepted and filtered by the filter stent, and the power of the blood flow from the cutting mechanism to the power conversion mechanism is converted into rotary motion by the power conversion mechanism and drives the cutting mechanism to rotate in the circumferential direction in the filter stent, so that the thrombus in the filter stent can be continuously cut and broken. Not only can the pulmonary embolism be prevented, but also the local thrombus embolism can be avoided.

[0075] Those skilled in the art can understand that the above-mentioned embodiments are specific embodiments for implementing the present application, and in actual application, various changes can be made in form and details without departing from the spirit and scope of the present application.

Claims

1. A plug-breaking filter, characterized in that, include: A power conversion mechanism, a filter plug support, and a cutting mechanism are sequentially connected along the axial direction and are capable of radial expansion and contraction; the power conversion mechanism and the cutting mechanism are axially limited relative to the filter plug support and are capable of circumferential rotation relative to the filter plug support; The power conversion mechanism can convert the power of the blood flow from the cutting mechanism to the power conversion mechanism into rotational motion and drive the cutting mechanism to rotate circumferentially within the filter plug support. The power conversion mechanism includes a rotating shaft and multiple blades, which are arranged radially around the rotating shaft. The blade includes a rotating rod and a blade portion, one end of the rotating rod being connected to the rotating shaft and the other end being connected to the blade portion; The blade portion includes a blade carrier and a blade membrane, wherein the blade membrane is disposed within the blade carrier to form the blade portion; The blade portion can be folded and unfolded relative to the rotating rod; The thrombus filter also includes a recovery mechanism connected to the proximal end of the power conversion mechanism; The recycling mechanism includes: multiple recycling rods and recycling hooks; The distal ends of the plurality of recovery rods are respectively connected to the proximal ends of the plurality of blades and can control the radial retraction of the plurality of blades; the proximal ends of the plurality of recovery rods are respectively connected to the recovery hook. The cutting mechanism includes a transmission component and at least one cutting structure, the at least one cutting structure being connected to the transmission component, and the cutting structure being capable of expanding and contracting radially. The cutting structure comprises multiple structures, which are arranged radially around the axial direction of the filter media; the transmission component is connected to the power conversion mechanism and can rotate with the power conversion mechanism. The cutting structure includes a cutting rod and a cutting part, wherein the two ends of the cutting rod are respectively connected to the transmission component and the cutting part; the cutting part includes a connected body and a cutting edge. The power conversion mechanism includes a rotating shaft, the filter plug bracket includes a connecting shaft, and the cutting mechanism includes a transmission component; The rotating shaft is connected to the transmission component, and the connecting shaft is movably sleeved on the rotating shaft; The transmission ratio between the cutting mechanism and the power conversion mechanism is equal to or greater than 1.

2. The filter for breaking up plugs according to claim 1, characterized in that, The blade portion has the following shapes: triangular, circular, fan-shaped, or elliptical.

3. The plug filter according to claim 1, characterized in that, The rotating rod is either straight or curved.

4. The filter for breaking up plugs according to claim 1, characterized in that, The cutting portion can be any of the following shapes: triangular, fan-shaped, rod-shaped, or circular.

5. The plug filter according to claim 1, characterized in that, The cutting rod is a round rod of equal diameter or a stepped round rod, or the cutting rod is a flat rod.

6. The filter for breaking up plugs according to claim 1, characterized in that, The blade and the body are integrally formed or the blade and the body are welded together.

7. The filter for breaking up plugs according to claim 1, characterized in that, The filter plug support includes a connecting shaft and multiple filter rods; The plurality of filter rods are arranged radially around the connecting shaft; the connecting shaft is rotatably connected to the power conversion mechanism and the cutting mechanism; the plurality of filter rods are capable of expanding and contracting radially.

8. The filter for breaking up plugs according to claim 7, characterized in that, The filter rod is provided with an anchoring part at its end.

9. The plug filter according to claim 7, characterized in that, The filter rod is either straight or curved.

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