Embolism protection device and embolism protection system

Abstract

The utility model discloses an embolism protection device and embolism protection system.The embolism protection device comprises a conveying guide wire, a self-adaption support and a filtering piece, the self-adaption support comprises a support fixing part, a support transition part, a support body part and a self-adaption part which are sequentially connected, the support fixing part is fixed to the conveying guide wire, and the self-adaption part is fixed to the conveying guide wire. The stent transition part and the stent main body part are made of shape memory metal, the stent main body part is annular and conveys a guide wire to penetrate through the stent main body part, and the self-adaptive part is annularly arranged on the outer surface of the stent main body part and can be bent and deformed towards the two sides of the self-adaptive part; the filtering piece is of an umbrella-shaped structure with an opening gradually reduced, the filtering piece comprises a first opening part and a second opening part, the first opening part wraps the stent body part and the self-adaption part, and the second opening part is connected with the conveying guide wire and can slide relative to the conveying guide wire. According to the embolism protection device, the self-adaptive part can be bent and deformed towards the two sides of the self-adaptive part, so that the embolism protection device is better in compliance and adherence to tortuous blood vessels and blood vessels with non-uniform sizes.

Description

Technical Field

[0001] The utility model relates to the field of vascular interventional medical devices, in particular to an embolism protection device and an embolism protection system. Background Art

[0002] Carotid artery stenosis is one of the main causes of ischemic stroke, and its incidence rate increases year by year. When treating carotid artery stenosis through carotid artery stenting surgery, a large number of embolic fragments will be generated. These tiny embolic fragments may cause stroke or damage the cranial nerve function when entering the brain along with the blood flow. In order to reduce such complication risks, an embolism protection device is placed at the distal end of the stent placement point to capture the tiny emboli generated during the operation, while not affecting the normal flow of the liquid in the blood vessel. After the carotid artery stent is successfully implanted, the embolism protection device together with the intercepted emboli is removed from the body through a retrieval catheter.

[0003] The mainstream filter-type embolism protection devices can be divided into two types according to the forming method of the filter stent: one is to cut a nickel-titanium alloy tube or wind a wire into a filter umbrella stent, and a polymer membrane with uniformly opened holes is coated on the stent to filter emboli without blocking the passage of the liquid in the cavity. The second stent structure is formed by weaving into an umbrella shape, and the weaving aperture is in a certain distribution range, which can have both the function of filtering thrombus and the passage of the liquid in the cavity.

[0004] In the deployed state, there is a situation where emboli in the blood vessel are stuck between the edge of the protection device and the blood vessel wall, resulting in the failure to successfully capture the emboli for traditional protection devices. In addition, for the traditional thrombus filter made by laser cutting a tube, its axial flexibility is poor in the compressed state, and it is difficult to pass through the inside of the steering catheter or be passively steered. Moreover, due to the non-uniformity of the diameter of the patient's carotid artery, it is very difficult to ensure the complete fit between the above-mentioned embolism protection device and the blood vessel after release, which may cause emboli to escape to the distal blood vessel through the gap between the embolism protection device and the blood vessel wall, thereby causing damage to the patient's brain tissue or nerve function. In addition, because the delivery guide wire is a slender body, when it is bent in a curved blood vessel, due to the inadvertent disturbance of the delivery guide wire by the operator or the movement brought by the human tissue, the movement of the delivery guide wire will occur, which will drive the continuous movement of the stent, resulting in vasospasm. Summary of the Invention

[0005] The purpose of the utility model is to provide an embolism protection device and an embolism protection system to solve the situation that in the deployed state of the traditional embolism protection device, there is a situation where the embolism protection device and the inner wall of the blood vessel cannot be completely fitted, resulting in thrombus being stuck or escaping.

[0006] To achieve the above object, the present utility model provides an embolization protection device, which includes a delivery guide wire, an adaptive stent, and a filter member connected to the adaptive stent. The adaptive stent has a deployed state and a contracted state. The adaptive stent includes a stent fixing portion, a stent transition portion, a stent main body portion, and an adaptive portion connected in sequence. The stent fixing portion is fixed on the delivery guide wire. The stent transition portion and the stent main body portion are made of shape memory metal. The stent main body portion is annular and the delivery guide wire passes through the stent main body portion. The adaptive portion is disposed around the outer surface of the stent main body portion and the adaptive portion can be bent and deformed toward both sides of itself to adaptively fit with the inner wall of the blood vessel in the deployed state. The filter member has an umbrella-shaped structure with a gradually decreasing opening so that the delivery guide wire passes through the filter member. The filter member includes a first opening portion and a second opening portion opposite to the first opening portion. The first opening portion is larger than the second opening portion. The first opening portion covers the stent main body portion and the adaptive portion, and the edge of the first opening portion is connected to the stent main body portion. The second opening portion is connected to the delivery guide wire and can slide relative to the delivery guide wire.

[0007] Preferably, the adaptive portion includes a plurality of wave-shaped portions, and each wave-shaped portion is provided with a valley portion and a peak portion. The valley portion is connected to the outer surface of the stent main body portion, and the peak portion can be bent and deformed toward both sides of the adaptive portion.

[0008] Preferably, the stent transition portion has a rod-shaped structure. One end of the stent transition portion is connected to the stent fixing portion, and the other end of the stent transition portion is connected to the stent main body portion. The stent transition portion is further provided with a flexible connection portion.

[0009] Preferably, the stent transition portion includes a first rod segment and a second rod segment. One end of the first rod segment is connected to the stent fixing portion, the other end of the first rod segment is connected to one end of the flexible connection portion, the other end of the flexible connection portion is connected to one end of the second rod segment, and the other end of the second rod segment is connected to the stent main body portion; or, one or both ends of the first rod segment and / or the second rod segment close to the flexible connection portion have arc surfaces, and both ends of the flexible connection portion are respectively sleeved on the first rod segment and the second rod segment and form a connection portion on the outer peripheral surfaces of the first rod segment and the second rod segment.

[0010] Preferably, the embolization protection device further includes a fixing ring. The fixing ring is sleeved on the delivery guide wire and can slide relative to the delivery guide wire. The second opening portion of the filter member is connected to the fixing ring.

[0011] Preferably, the fixing ring is a radiopaque ring.

[0012] Preferably, the filter element is provided with filter holes, the filter element is a filter membrane, the filter membrane is formed of a polymer thin film material, and the aperture of the filter holes is greater than or equal to 80 microns and less than or equal to 180 microns; or, the filter element is provided with filter holes, the filter element is a filter screen, the filter screen is woven from a metal material, and the aperture of the filter holes is greater than or equal to 80 microns and less than or equal to 180 microns; or, the filter element is provided with filter holes, the filter element is a filter screen, the filter screen is woven or non-woven from a polymer material, and the aperture of the filter holes is greater than or equal to 80 microns and less than or equal to 180 microns.

[0013] Preferably, the delivery guide wire has a delivery distal end and a delivery proximal end opposite to the delivery distal end, the filter element is located proximal to the delivery distal end, and the delivery distal end is provided with an elastic end.

[0014] Preferably, when the self-adaptive stent is in the deployed state, the angle between the plane where the stent main body portion is located and the horizontal direction is greater than or equal to 45 degrees and less than or equal to 60 degrees.

[0015] The present invention also provides an embolization protection system, including a delivery catheter and the above-mentioned embolization protection device, a delivery channel is provided in the delivery catheter, and the embolization protection device is slidably arranged in the delivery channel of the delivery catheter.

[0016] Preferably, the embolization protection system further includes a retrieval catheter, a retrieval channel is provided in the retrieval catheter, and the embolization protection device is slidably arranged in the retrieval channel of the retrieval catheter.

[0017] Preferably, the retrieval catheter has a retrieval distal end and a retrieval proximal end opposite to the retrieval distal end, the retrieval distal end has an enlarged open end; and / or one end of the delivery catheter is connected to one end of the retrieval catheter.

[0018] Compared with the prior art, the self-adaptive part of the present invention can bend and deform towards both sides of itself, so that it can be deformed according to the shape of the blood vessel to ensure a better fitting effect between the filter element and the inner wall of the blood vessel, making the compliance and wall attachment of the embolization protection device at tortuous blood vessels and for blood vessels with uneven sizes better, avoiding the problem that traditional embolization protection devices have gaps in curved blood vessels and allowing micro-emboli to escape. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural view of the embolization protection device of the present invention.

[0020] Figure 2 is Figure 1 an enlarged view of part A in

[0021] Figure 3 This is a side view schematic diagram of the embolization protection device of the present utility model from the proximal end to the distal end of the delivery guide wire.

[0022] Figure 4 This is a schematic structural diagram of the embolization protection device of the present utility model being delivered into a blood vessel while being contracted in a delivery catheter.

[0023] Figure 5 This is a schematic structural diagram of the embolization protection device of the present utility model in an expanded state.

[0024] Figure 6 This is a schematic structural diagram of the embolization protection device of the present utility model in an expanded state in a blood vessel with uneven dimensions.

[0025] Figure 7 This is a schematic structural diagram of the embolization protection device of the present utility model in an expanded state at the stenosis in a blood vessel with uneven dimensions.

[0026] Figure 8 This is a schematic structural diagram of the embolization protection device of the present utility model in a state of retrieving a thrombus.

[0027] Figure 9 This is another schematic structural diagram of the stent transition part in the embolization protection device of the present utility model.

[0028] Figure 10 This is a schematic structural diagram of the integrated arrangement of a delivery catheter and a retrieval catheter in the embolization protection system of the present utility model.

[0029] Figure 11 This is a schematic structural diagram of the embolization protection device being delivered by the integrated delivery catheter and retrieval catheter of the present utility model.

[0030] Figure 12 This is a schematic structural diagram of the embolization protection device being retrieved by the integrated delivery catheter and retrieval catheter of the present utility model. Detailed implementation manners

[0031] To describe in detail the technical content, structural features, and achieved effects of the present utility model, the following is a detailed description in conjunction with the implementation manners and with reference to the accompanying drawings.

[0032] It should be noted that in the above description and the following description, "proximal end" generally refers to the end of a medical device that is closer to the operator during normal operation, and "distal end" generally refers to the end of a medical device that first enters the patient's body during normal operation.

[0033] Such as Figures 1 to 8As shown in the figure, the present utility model provides an embolization protection device 10, which includes a delivery guide wire 1, an adaptive stent 2, and a filter element 3 connected to the adaptive stent 2. The adaptive stent 2 has a deployed state and a contracted state. The adaptive stent 2 includes a stent fixing part 21, a stent transition part 22, a stent main body part 23, and an adaptive part 24 that are connected in sequence. The stent fixing part 21 is fixed on the delivery guide wire 1. The stent transition part 22 and the stent main body part 23 are made of shape memory metal. The stent main body part 23 is annular and the delivery guide wire 1 passes through the stent main body part 23. The adaptive part 24 is disposed around the outer surface of the stent main body part 23 and the adaptive part 24 can be bent and deformed toward both sides of itself to adaptively fit the inner wall of the blood vessel 5 in the deployed state. The filter element 3 has an umbrella-shaped structure with a gradually decreasing opening, and the delivery guide wire 1 passes through the filter element 3. The filter element 3 includes a first opening part 32 and a second opening part 33 opposite to the first opening part 32. The first opening part 32 is larger than the second opening part 33. The first opening part 32 covers the stent main body part 23 and the adaptive part 24, and the edge of the first opening part 32 is connected to the stent main body part 23. The second opening part 33 is connected to the delivery guide wire 1 and can slide relative to the delivery guide wire 1.

[0034] Specifically, the present invention constructs an adaptive stent 2 through shape memory metal, which can contract and automatically expand into its original shape. The structure of the adaptive stent 2 can be made of a single shape memory metal wire. One end of the shape memory metal wire is bent to form a stent fixing part 21; the other end of the shape memory metal wire is partially bent and shaped into a ring to form a stent main body part 23, and the middle part of the shape memory metal wire forms a stent transition part 22; the adaptive part 24 can be prepared from a shape memory alloy wire. The adaptive stent 2 is generally similar to a lasso structure. The contracted state of the adaptive stent 2 is similar to putting the lasso into the delivery catheter 6, forming an oval structure in the delivery catheter 6. The expanded state of the adaptive stent 2 is to push out the lasso, and due to the elasticity of the shape memory metal itself, it resumes its shape again. The outer diameter of the stent main body part 23 in the expanded state is within the range of 5 to 20 mm. The material of the delivery guide wire 1 can be stainless steel or shape memory metal, etc., and the diameter of the delivery guide wire 1 is greater than or equal to 0.152 mm and less than or equal to 0.965 mm. For the delivery guide wire 1 applied to coronary arteries, carotid arteries and small peripheral blood vessels, the diameter range can be from 0.152 mm to 0.965 mm; the diameter of the delivery guide wire 1 usually used for coronary arteries can be from 0.305 mm to 0.457 mm, and the diameter range of the delivery guide wire 1 usually used for carotid arteries and neurovascular vessels can be from 0.254 mm to 0.457 mm. For the diameter range of the delivery guide wire 1 applied to peripheral blood vessels, for example, in the leg vascular system, a diameter of 0.355 mm to 0.965 mm is usually required. The surface of the delivery guide wire 1 can be coated with a polymer lubricating coating to reduce the resistance during the pushing process of the delivery guide wire 1. The first opening 32 of the filter element 3 can be connected to the stent main body part 23 by means of glue. During use, the embolization protection device 10 contracts in the delivery catheter 6 and is transported to the distal end of the diseased position such as vascular stenosis. After the delivery catheter 6 is withdrawn, the adaptive stent 2 is released from the delivery catheter 6. The adaptive stent 2 expands from the contracted state to the expanded state, providing good support for the filter element 3. And because the adaptive part 24 can be bent and deformed towards both sides of itself, it can be deformed according to the shape of the blood vessel 5 to ensure a better fitting effect between the filter element 3 and the inner wall of the blood vessel 5, making the embolization protection device have better compliance and wall attachment at the tortuous blood vessel 5 and for blood vessels 5 with uneven sizes, avoiding the problem that there are gaps in the traditional embolization protection device in the curved blood vessel 5 and allowing micro-emboli to escape. Moreover, the first opening 32 of the filter element 3 is arranged towards the proximal end of the delivery guide wire 1.

[0035] In the embodiment of the present utility model, as Figure 3As shown in the figure, the adaptive part 24 includes a number of wave-shaped parts, and each wave-shaped part is provided with a valley part 241 and a peak part 242. The valley part 241 is connected to the outer surface of the bracket main body part 23, and the peak part 242 can be bent and deformed towards both sides of the adaptive part 24. Specifically, the valley part 241 can be fixed on the outer surface of the bracket main body part 23 by means of glue bonding or hot melting. The number of wave-shaped parts can be formed by bending a metal wire into a wave-shaped structure with a valley part 241 and a peak part 242 and connecting the head and tail, or can be formed by bending multiple metal wires into wave-shaped structures and connecting the head and tail in sequence. For example, it can be formed by bending 8 to 15 metal wires into wave-shaped structures and connecting the head and tail in sequence.

[0036] Furthermore, the wave-shaped part is formed by weaving a first developing wire. The first developing wire includes a developing inner core and a shell coated on the developing inner core. Specifically, the developing inner core is a metal that can be developed, such as platinum or its alloy, gold or its alloy, tungsten or its alloy, tantalum or its alloy, etc., and the shell is a shape memory alloy such as nickel-titanium alloy, with a clever design. Of course, in some other embodiments, the wave-shaped part can also be formed by weaving a shape memory metal wire and a developing wire.

[0037] In the embodiment of the present invention, as Figures 1 to 3 shown, the bracket transition part 22 has a rod-shaped structure. One end of the bracket transition part 22 is connected to the bracket fixing part 21, the other end of the bracket transition part 22 is connected to the bracket main body part 23, and a flexible connection part 223 is provided on the bracket transition part 22. By providing the flexible connection part 223, the phenomenon of blood vessel 5 spasm caused by the disturbing force of the delivery guide wire 1 being transmitted to the bracket main body part 23 can be reduced.

[0038] Furthermore, as Figure 2 shown, the bracket transition part 22 includes a first rod segment 221 and a second rod segment 222. One end of the first rod segment 221 is connected to the bracket fixing part 21, the other end of the first rod segment 221 is connected to one end of the flexible connection part 223, the other end of the flexible connection part 223 is connected to one end of the second rod segment 222, and the other end of the second rod segment 222 is connected to the bracket main body part 23. The flexible connection part 223 can specifically be a first spring, and the spring is used to buffer and release the disturbing force on the delivery guide wire 1.

[0039] In some other specific implementation manners of the embodiment of the present invention, as Figure 9As shown, one end of the first rod segment 221 and / or the second rod segment 222 close to the flexible connection part 223 has an arc surface. Both ends of the flexible connection part 223 are respectively sleeved on the first rod segment 221 and the second rod segment 222 and form a connection part on the outer peripheral surfaces of the first rod segment 221 and the second rod segment 222. Specifically, the flexible connection part 223 can specifically be a second spring. One end of the first rod segment 221 close to the flexible connection part 223 has a first arc surface 2211, and one end of the second rod segment 222 close to the flexible connection part 223 has a second arc surface 2221. The settings of the first arc surface 2211 and the second arc surface 2221 can ensure that the resistance is reduced during the relative movement of the first rod segment 221 and the second rod segment 222. Of course, in some other specific embodiments of the present invention, an arc surface can be provided only on the first rod segment 221 or the second rod segment 222, and the resistance can also be reduced during the relative movement of the first rod segment 221 and the second rod segment 222.

[0040] In an embodiment of the present invention, as Figure 2 shown, a developing element is provided on the stent fixing part 21. The developing element is composed of a second developing wire 41, and the second developing wire 41 is wound around the delivery guide wire 1. Specifically, the stent fixing part 21 can be a shape memory alloy wire. The stent fixing part 21 and the second developing wire 41 are arranged side by side to form a double-strand wire and then wound around the delivery guide wire 1 at the same time. The second developing wire 41 can be wound by one or several of platinum-iridium wire, platinum-tungsten wire, and tungsten-gold wire materials. Of course, other materials with good biocompatibility and certain elasticity or softness can also be used. Of course, in some other specific embodiments, the stent fixing part 21 can be directly composed of the second developing wire 41, and the second developing wire 41 is wound around the delivery guide wire 1. By directly composing the stent fixing part 21 of the second developing wire 41, the structure is more concise. In some other specific embodiments, a developable developing columnar ring can also be sleeved on the delivery guide wire 1 first and the developing columnar ring is fixed to the delivery guide wire 1, and then the stent fixing part 21 is welded to the developing columnar ring. The fixing form of the stent fixing part 21 and the delivery guide wire 1 is not limited, and can be specifically selected and designed according to the actual situation.

[0041] In an embodiment of the present invention, as Figure 1 shown, the embolization protection device 10 further includes a fixing ring 42. The fixing ring 42 is sleeved on the delivery guide wire 1 and can slide relative to the delivery guide wire 1. The second opening 33 of the filter element 3 is connected to the fixing ring 42. Specifically, the second opening 33 of the filter element 3 can be connected to the fixing ring 42 by means of glue or heat melting. The fixing ring 42 is set to be slidable relative to the delivery guide wire 1, which can facilitate the self-adaptive expansion and contraction of the stent 2. Specifically, in order to prevent embolization substances such as thrombus from leaking through the pores of the fixing ring 42, the inner diameter of the fixing ring 42 is slightly larger than the outer diameter of the delivery guide wire 1, and at the same time, it is ensured that the fixing ring 42 can slide relative to the delivery guide wire 1 more smoothly.

[0042] Further, the fixing ring 42 is a developing ring. By setting the fixing ring 42 as a developing ring, it is convenient for the expansion and contraction of the adaptive stent 2 and also facilitates accurately obtaining the position of the second opening 33 of the filter element 3.

[0043] In the embodiment of the present utility model, as Figure 1 shown, the filter element 3 is provided with filter holes 31. The filter element 3 is a filter membrane formed of a polymer thin film material. The aperture of the filter holes 31 is greater than or equal to 80 microns and less than or equal to 180 microns to ensure that emboli will not pass through while allowing blood flow to pass through smoothly. Specifically, the filter membrane is made by punching and shaping a polymer thin film material. The polymer thin film material is preferably materials such as PU, TPU, and PEBAX. In some other specific embodiment modes of the present utility model, the filter element 3 is provided with filter holes 31. The filter element 3 is a filter net formed by weaving a metal material. The aperture of the filter holes 31 is greater than or equal to 80 microns and less than or equal to 180 microns. The filter net is a bag-like structure. For example, the filter net is formed by weaving and shaping metal wires, and the diameter of the metal wires is 0.04 - 0.1 mm. In still some other specific embodiment modes of the present utility model, the filter element 3 is provided with filter holes 31. The filter element 3 is a filter net formed by weaving or non-weaving a polymer material. The aperture of the filter holes 31 is greater than or equal to 80 microns and less than or equal to 180 microns. The material and manufacturing method of the filter element 3 can be selected according to actual needs.

[0044] In the embodiment of the present utility model, as Figure 1 shown, the delivery guide wire 1 has a delivery distal end 11 and a delivery proximal end 12 opposite to the delivery distal end 11. The filter element 3 is located proximal to the delivery distal end 11, and the delivery distal end 11 is provided with an elastic end portion 43. Specifically, the elastic end portion 43 is a soft structure, so that when the delivery guide wire 1 moves in the blood vessel 5, the damage to the blood vessel 5 can be reduced. In addition, the elastic end portion 43 can be a developing spring, and the developing spring can be wound by one or several of platinum-iridium wire, platinum-tungsten wire, and tungsten-gold wire materials. Of course, the elastic end portion 43 can also be made of other materials with good biocompatibility and certain elasticity or softness, so as to facilitate displaying the real-time position of the delivery guide wire 1, and the design is ingenious.

[0045] In the embodiment of the present utility model, as Figure 1 and Figures 5 to 7 shown, when the adaptive stent 2 is in the deployed state, the angle between the plane where the stent main body portion 23 is located and the horizontal direction is greater than or equal to 45 degrees and less than or equal to 60 degrees. Thus, while ensuring that the stent main body portion 23 has strong supporting performance for the filter element 3, the recovery resistance of the filter element 3 can be reduced, and the design is ingenious.

[0046] When the embolism protection device 10 of the present utility model is working, asFigure 4 As shown, the embolization protection device 10 is contracted in the delivery catheter 6 and transported to a diseased location such as carotid artery stenosis, and then released from the delivery catheter 6.

[0047] As Figures 5 to 8 shown, after the self-adaptive stent 2 is withdrawn from the delivery catheter 6, the self-adaptive stent 2 expands to the deployed state, providing good support for the filter element 3. Since the self-adaptive part 24 can bend and deform towards both sides of itself, it can deform according to the shape of the blood vessel 5 to ensure a better fitting effect between the filter element 3 and the inner wall of the blood vessel 5. This makes the embolization protection device have better compliance and wall attachment at tortuous blood vessels 5 and for blood vessels 5 with uneven sizes, avoiding the problem of voids occurring in the traditional embolization protection device 10 in the curved blood vessel 5 and allowing tiny emboli to escape. Moreover, when the stent main body part 23 is in the contracted state, in the same cross-section along the radial direction of the delivery catheter 6, it can contain at most two shape memory alloy wires, so it has relatively small axial rigidity and good flexibility in the axial direction in the compressed state, that is, it is softer and easier to bend, enabling it to more easily pass through the inner cavity of the curved delivery catheter 6 and more easily follow the passive bending of the delivery catheter 6 with a bending control function. As Figure 6 shown, even when facing the inner wall of a blood vessel 5 with uneven sizes, the self-adaptive part 24 can adapt to the gap between the self-adaptive stent 2 and the inner wall of the blood vessel 5 according to the actual situation, providing good wall attachment performance for the embolization protection device. At the same time, the soft self-adaptive part 24 can relieve the stimulation of the embolization protection device to the blood vessel and reduce the risk of carotid artery vasospasm. Figure 5 and Figure 6 The arrows in Figure 7 show the direction of blood flow. As Figure 7 shown, when the embolization protection device is released at different positions, the self-adaptive part 24 can perfectly fill the gap between the self-adaptive stent 2 and the inner wall of the blood vessel 5, ensuring a better fitting effect between the filter element 3 and the inner wall of the blood vessel 5.

[0048] As Figure 8 and Figure 10 shown, the embolization protection device 10 is retrieved using a retrieval catheter 7. One end of the retrieval catheter 7 has an enlarged open end 71. When retrieving the embolization protection device 10, the retrieval catheter 7 uses the enlarged open end 71 to squeeze the self-adaptive stent 2 forward for retrieval, so that the embolization protection device 10 can enter the retrieval catheter 7. When there is too much thrombus 8 in the filter net, only the self-adaptive stent 2 can enter the retrieval catheter 7, avoiding the leakage of thrombus 8 caused by forcibly retrieving the embolization protection device 10. At the same time, the setting of the enlarged open end 71 can prevent the leakage of thrombus 8.

[0049] An embodiment of the present utility model further provides an embolization protection system, which includes a delivery catheter 6 and the above-mentioned embolization protection device 10. A delivery channel 61 is provided in the delivery catheter 6, and the embolization protection device 10 is slidably arranged in the delivery channel 61 of the delivery catheter 6.

[0050] Furthermore, the embolization protection system further includes a retrieval catheter 7. A retrieval channel 72 is provided in the retrieval catheter 7, and the embolization protection device 10 is slidably arranged in the retrieval channel 72 of the retrieval catheter 7.

[0051] In this embodiment, the retrieval catheter 7 has a retrieval distal end and a retrieval proximal end opposite to the retrieval distal end. The retrieval distal end has an enlarged opening end 71; one end of the delivery catheter 6 is connected to one end of the retrieval catheter 7. Specifically, the delivery catheter 6 and the retrieval catheter 7 can adopt an integral structure or a split structure. As Figures 10 to 11 shown, when the delivery catheter 6 and the retrieval catheter 7 adopt an integral structure, one end of the delivery catheter 6 is connected to one end of the retrieval catheter 7 to form an intermediate section 9. A delivery hole 63 is provided at a position of the delivery catheter 6 close to the intermediate section 9. The delivery hole 63 provides a delivery inlet for the embolization protection device 10. A guide wire exchange port 62 is provided at a part of the delivery catheter 6 away from the intermediate section 9. The guide wire exchange port 62 is used for the guiding guide wire 64 to pass through.

[0052] As Figure 11 shown, during delivery, first, the guiding guide wire 64 is introduced into the vascular stenosis lesion and passes through the vascular stenosis lesion. Then, the delivery catheter 6 is introduced along the guiding guide wire 64 and passes through the vascular stenosis lesion. Then, the embolization protection device 10 is sent along the delivery hole 63, and the embolization protection device 10 extends out of the outlet of the delivery catheter 6. The self-expanding stent 2 expands and adheres to the inner wall of the blood vessel.

[0053] As Figure 10 shown, a retrieval hole 73 is provided at a position of the retrieval catheter 7 close to the intermediate section 9. The retrieval hole 73 provides a retrieval inlet for the embolization protection device 10.

[0054] As Figure 10 and Figure 12 shown, during retrieval, first, the delivery guide wire 1 is advanced along the retrieval channel 72 and passes through the retrieval hole 73. The retrieval catheter 7 is pushed along the delivery guide wire 1 to the proximal end of the self-expanding stent 2. The delivery guide wire 1 is pulled, the self-expanding stent 2 contracts into the retrieval catheter 7, and the retrieval catheter 7 and the embolization protection device 10 are pulled out of the blood vessel as a whole.

[0055] The above-disclosed are only the preferred examples of the present utility model. Of course, the scope of rights of the present utility model cannot be limited thereby. Therefore, equivalent changes made according to the scope of the patent application of the present utility model still fall within the scope covered by the present utility model.

Claims

1. An embolic protection device, characterized in that: It comprises a delivery guide wire, an adaptive stent and a filter connected to the adaptive stent, the adaptive stent has an expanded state and a contracted state, the adaptive stent comprises a stent fixing portion, a stent transition portion, a stent main body portion and an adaptive portion connected in sequence, the stent fixing portion is fixed on the delivery guide wire, the stent transition portion and the stent main body portion are made of shape memory metal, the stent main body portion is annular and the delivery guide wire passes through the stent main body portion, the adaptive portion is annularly arranged on the outer surface of the stent main body portion and the adaptive portion can be bent and deformed to both sides thereof so as to adaptively fit with the inner wall of the blood vessel in the expanded state; The filter element is an umbrella-shaped structure with a gradually decreasing opening so that the delivery guidewire can pass through the filter element. The filter element includes a first opening portion and a second opening portion opposite to the first opening portion, the first opening portion is larger than the second opening portion, the first opening portion covers the stent body and the adaptive portion, and the edge of the first opening portion is connected to the stent body, and the second opening portion is connected to the delivery guidewire and can slide relative to the delivery guidewire.

2. The embolic protection device according to claim 1, characterized in that: The adaptive part includes a plurality of wavy parts, each of which is provided with a valley part and a peak part, the valley part is connected to the outer surface of the bracket body part, and the peak part can be bent and deformed toward both sides of the adaptive part.

3. The embolic protection device according to claim 2, characterized in that: The support transition portion is in a rod-shaped structure, one end of the support transition portion is connected to the support fixing portion, and the other end of the support transition portion is connected to the support main body portion. A flexible connection portion is also provided on the support transition portion.

4. The embolic protection device according to claim 3, characterized in that: The bracket transition portion includes a first rod segment and a second rod segment, one end of the first rod segment is connected to the bracket fixing portion, the other end of the first rod segment is connected to one end of the flexible connection portion, the other end of the flexible connection portion is connected to one end of the second rod segment, and the other end of the second rod segment is connected to the bracket main body; or, One end of the first rod segment and / or the second rod segment close to the flexible connecting portion has an arc surface, and two ends of the flexible connecting portion are respectively sleeved on the first rod segment and the second rod segment to form a connecting portion on the outer circumference of the first rod segment and the second rod segment.

5. The embolic protection device according to claim 1, wherein: The embolic protection device further comprises a fixing ring, which is sleeved on the delivery guide wire and can slide relative to the delivery guide wire, and the second opening of the filter element is connected to the fixing ring.

6. The embolic protection device according to claim 5, characterized in that: The fixed ring is a developing ring.

7. The embolic protection device according to claim 1, wherein: The filter element is provided with a filter hole, the filter element is a filter membrane, the filter membrane is formed of a polymer film material, and the pore size of the filter hole is greater than or equal to 80 microns and less than or equal to 180 microns; or, The filter element is provided with filter holes, the filter element is a filter screen, the filter screen is woven from a metal material, and the pore size of the filter holes is greater than or equal to 80 microns and less than or equal to 180 microns; or, The filter element is provided with filter holes, the filter element is a filter screen, the filter screen is woven or non-woven from a polymer material, and the pore size of the filter holes is greater than or equal to 80 microns and less than or equal to 180 microns.

8. The embolic protection device according to claim 1, wherein: The delivery guide wire has a delivery distal end and a delivery proximal end opposite to the delivery distal end, the filter element is located at the proximal side of the delivery distal end, and the delivery distal end is provided with an elastic end.

9. The embolic protection device according to claim 1, wherein: When the adaptive bracket is in the unfolded state, the angle between the plane where the bracket main body is located and the horizontal direction is greater than or equal to 45 degrees and less than or equal to 60 degrees.

10. An embolic protection system, characterized in that: It comprises a delivery catheter and the embolic protection device according to any one of claims 1 to 9, wherein a delivery channel is provided in the delivery catheter, and the embolic protection device is slidably arranged in the delivery channel of the delivery catheter.

11. The embolic protection system according to claim 10, wherein: The embolic protection system further comprises a retrieval catheter, in which a retrieval channel is provided, and the embolic protection device is slidably disposed in the retrieval channel of the retrieval catheter.

12. The embolic protection system according to claim 11, wherein: The retrieval catheter has a retrieval distal end and a retrieval proximal end opposite to the retrieval distal end, the retrieval distal end has an enlarged opening end; and / or one end of the delivery catheter is connected to one end of the retrieval catheter.

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