Separable far-end protection device

Abstract

The invention discloses a separable far-end protection device which comprises a pushing rod and a protection umbrella, the protection umbrella is detachably connected with the pushing rod, the protection umbrella is of a self-expansion structure, and after the protection umbrella is expanded and opened, a capturing space used for capturing thrombus is formed in the protection umbrella. The separable connection mode can be electromagnetic adsorption, buckle connection or other reasonable and effective connection modes, preferably electromagnetic adsorption separation mode connection. Compared with the prior art, the separable far-end protection device has the advantages that the protection umbrella is in separable connection, so that the separable far-end protection device can be temporarily implanted into a blood vessel, sufficient space is reserved for treatment of a narrow part, and the separable far-end protection device is wide in application scene.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a detachable distal protection device. Background Art

[0002] When treating intracranial vascular stenosis, whether using catheter aspiration technology or plaque removal technology, the calcified plaques in the arterial lumen will be broken up during the thrombectomy process. The broken plaques can easily block the distal arteries, causing the risk of necrosis or even amputation of distal tissues due to poor blood circulation.

[0003] Distal protection devices are widely used in interventional thrombectomy to avoid distal embolism. However, in the prior art (for example, a segmented movable thrombectomy disclosed in CN 117398155 A, in which a limiting ball is provided to prevent the thrombectomy body from being separated from the delivery guide wire), the distal protection device cannot be placed independently in the blood vessel. The distal protection device needs to be connected to the delivery system at all times, which greatly limits the operating space of the narrow blood vessel. Moreover, a narrow stent with its own delivery system cannot be used together with the distal protection device, which greatly limits the application scenarios of the distal protection device. Summary of the invention

[0004] The main purpose of the present invention is to provide a detachable distal protection device, aiming to solve the problem that the current distal protection device cannot be independently placed in a blood vessel.

[0005] To achieve the above-mentioned purpose, the present invention proposes a detachable distal protection device, which includes a pushing rod and a protective umbrella. The protective umbrella is detachably connected to the pushing rod, and the protective umbrella is a self-expanding structure. After the protective umbrella expands and opens, a capture space for capturing thrombus is formed inside.

[0006] Furthermore, the detachable connection method may be electromagnetic adsorption, snap connection or other reasonable and effective connection methods, and as long as the detachability can be achieved, it is within the protection scope of the present invention.

[0007] In some embodiments, the proximal end of the protective umbrella is connected to the distal end of the pushing rod by electromagnetic adsorption separation.

[0008] In some embodiments, an electromagnetic connector is provided at the proximal end of the protective umbrella, and an electromagnetic assembly is provided at the distal end of the push rod. When the electromagnetic assembly is powered on, the proximal end of the protective umbrella is connected to the distal end of the push rod under the electromagnetic action between the electromagnetic connector and the electromagnetic assembly. When the electromagnetic assembly is powered off, the proximal end of the protective umbrella and the distal end of the push rod are separated.

[0009] In some embodiments, the electromagnetic triggering device comprises:

[0010] A battery, wherein the battery is disposed at the proximal end of the push rod;

[0011] A plurality of iron cores, wherein the plurality of iron cores are arranged at a distal end of the push rod at intervals along the circumference of the push rod;

[0012] a coil, the coil being wound around each of the iron cores and being electrically connected to the battery;

[0013] An electromagnetic switch is arranged at the proximal end of the push rod and is electrically connected to the coil and the battery, and is used to control the power on or off of the coil.

[0014] In some embodiments, the electromagnetic connector includes a connecting rod and a connecting ball disposed at the proximal end of the connecting rod, the distal end of the connecting rod is connected to the proximal end of the protective umbrella, and the connecting ball is made of stainless steel;

[0015] An auxiliary connection assembly is arranged at the proximal end of the protective umbrella, and the auxiliary connection assembly comprises an outer tube and an inner tube which are sleeved on each other, the connecting rod is fixed in the inner tube, the outer tube is a stainless steel tube, and the inner tube is a platinum-iridium tube.

[0016] In some embodiments, the protective umbrella includes a supporting frame and an elastic porous coating, wherein the supporting frame is a self-expanding stent, and after the supporting frame expands and opens, it forms the capture space with the elastic porous coating, the proximal end of the supporting frame is detachably connected to the distal end of the pushing rod, and the elastic porous coating covers the distal surface of the supporting frame, and the elastic porous coating is provided with a plurality of through holes connected to the capture space for blood flow to pass through and for capturing blood clots.

[0017] In some embodiments, the support skeleton is a tubular structure cut from a nickel-titanium alloy tube and shaped by heat treatment; the support skeleton includes a first tube segment, a plurality of support beams and a second tube segment connected to each other, and the plurality of support beams are expanded and opened to enclose the elastic porous membrane to form the capture space.

[0018] In some embodiments, the through hole is a circular hole, and the diameter of the through hole is 60-120 μm; along the direction from the distal end to the proximal end of the elastic porous membrane, the diameter of the through hole gradually increases with every 1 mm interval.

[0019] In some embodiments, the protective umbrella is woven with nickel-titanium braided wire; the protective umbrella includes a braided main body, and a first fixed tube and a second fixed tube are respectively arranged at the distal end and the proximal end of the braided main body, and the capture space is formed inside the braided main body segment after it is expanded and opened, and a hole connected to the capture space is formed on the proximal surface to allow the thrombus to pass through and flow into the capture space; the mesh aperture formed by the braided main body is 100-120μm.

[0020] In some embodiments, a developing assembly is disposed on the protective umbrella, and the developing assembly is located at the maximum inner diameter of the protective umbrella after it is opened.

[0021] The present invention provides a method for using the above-mentioned detachable remote protection device, comprising the following steps:

[0022] Press the electromagnetic switch of the electromagnetic assembly to energize the coil. Under the electromagnetic effect, the protective umbrella is automatically adsorbed to the distal end of the push rod through the electromagnetic connector. The operator delivers the protective umbrella to the target blood vessel through the push rod. When the target position is reached, press the electromagnetic switch of the electromagnetic assembly to de-energize the coil. At this time, the electromagnetic connector automatically falls off, and the protective umbrella is separated from the push rod. The protective umbrella is temporarily installed at the target position in the blood vessel (i.e., the part to be treated). After the protective umbrella is released, it expands and opens to fit the blood vessel wall to capture the thrombus. At the same time, withdraw the push rod, and the blood vessel space of the required treatment part is vacated, and the stent with its own delivery system can also be used for treatment; after the stenosis treatment is completed, the push rod is transported to the protective umbrella again, and the electromagnetic switch is pressed again at the proximal end to energize the coil. The protective umbrella is automatically adsorbed to the distal end of the push rod again through the electromagnetic connector, and the push rod and the protective umbrella are recovered together and withdrawn from the body.

[0023] The present invention proposes the application of the above-mentioned detachable distal protection device, which can be used in the process of interventional thrombectomy to avoid distal embolism.

[0024] Compared with the prior art, the beneficial effects of the present invention are embodied in the following aspects:

[0025] 1) The detachable distal protection device provided by the present invention includes a push rod and a protective umbrella, the protective umbrella is detachably connected to the push rod, and the protective umbrella is a self-expanding structure. After the protective umbrella expands and opens, a capture space for capturing thrombus is formed inside. Since the protective umbrella is set to be detachably connected, it can be temporarily implanted in a blood vessel, leaving sufficient space for the treatment of stenosis, and its application scenarios are relatively wide.

[0026] 2) The detachable distal protection device provided by the present invention can be temporarily implanted in the blood vessel through the detachable characteristic of the protective umbrella, leaving sufficient space for the treatment of the stenotic part. The protective umbrella can be temporarily detached from the delivery system and can be recovered after the operation is completed. The detachment and recovery can rely on electromagnetic drive.

[0027] 3) The detachable distal protection device provided by the present invention is different from the existing technologies such as catheter aspiration technology and plaque excision technology in that the protective umbrella of the present device is connected by electromagnetic adsorption separation and is detachable and can be temporarily implanted in the blood vessel. The protective umbrella of the self-expanding structure forms a capture space for capturing thrombus inside after opening. The detachable protective umbrella of the present device will fit the blood vessel wall after release and only needs to be powered off without adding a demagnetization coil. Although a small amount of magnetism remains after the power is turned off at the distal end of the push rod, it can be detached by relying on the slight friction between the protective umbrella and the blood vessel wall.

[0028] 4) The detachable distal protection device provided by the present invention has an auxiliary connection device configured as a pipe section with multiple layers of materials stacked together, and a platinum-iridium pipe section inside the stainless steel pipe section, which facilitates the positioning of the protective umbrella during the recovery process. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0030] Figure 1 A structural schematic diagram of an embodiment of a remote protection device provided by the present invention (protection umbrella and push rod are separated);

[0031] Figure 2 This is a schematic diagram of the assembly of the push rod and the electromagnetic component in the remote protection device provided by the present invention;

[0032] Figure 3 It is a schematic diagram of assembling the auxiliary connection component and the electromagnetic connection member in the remote protection device provided by the present invention;

[0033] Figure 4 A schematic structural diagram of an embodiment of a protective umbrella in a remote protection device provided by the present invention;

[0034] Figure 5 for Figure 4 A schematic diagram of the structure of the umbrella from another perspective;

[0035] Figure 6 A schematic structural diagram of another embodiment of a protective umbrella in a remote protection device provided by the present invention;

[0036] Figure 7 A structural schematic diagram of another embodiment of a protective umbrella in a remote protection device provided by the present invention;

[0037] Figure 8A schematic structural diagram of another embodiment of a protective umbrella in a remote protection device provided by the present invention;

[0038] Fig. 9 for Figure 8 Schematic diagram of the structure of the umbrella from another perspective.

[0039] Fig.10 A structural schematic diagram of an embodiment of a remote protection device provided by the present invention (a protection umbrella and a push rod are connected);

[0040] Description of Figure Numbers:

[0041] 100-remote protection device; 1-protective umbrella; 11-support skeleton; 111-first pipe section; 112-support beam; 113-second pipe section; 12-elastic porous coating; 121-through hole; 13-woven body; 13a-hole; 131-first fixed tube; 132-second fixed tube; 14-developing assembly; 15-auxiliary connecting assembly; 151-outer tube; 152-inner tube; 2-electromagnetic connector; 21-connecting rod; 22-connecting ball; 3-push rod; 31-guide inner cavity; 32-main body inner cavity; 4-electromagnetic assembly; 41-iron core; 42-coil; 43-electromagnetic switch; 44-battery.

[0042] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] The present invention is described in detail below in conjunction with specific embodiments, but is by no means intended to limit the present invention. Features such as preparation methods, materials, structures or composition ratios not explicitly described in this technical solution are considered to be common technical features disclosed in the prior art.

[0045] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0046] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0048] Example

[0049] In order to solve the problem that the current distal protection device 100 cannot be placed independently in a blood vessel, the present invention provides a detachable distal protection device 100, and the protection umbrella 1 is set to be detachably connected, so that the protection umbrella 1 can be temporarily implanted in the blood vessel, leaving sufficient space for the treatment of the stenosis, and its application scenarios are relatively wide.

[0050] Please refer to Figures 1 to 3 In one embodiment of the present invention, the distal protection device 100 includes a push rod 3 and a protective umbrella 1. The protective umbrella 1 is detachably connected to the push rod 3. The protective umbrella 1 is a self-expanding structure. After the protective umbrella 1 expands and opens, a capture space for capturing thrombus is formed inside.

[0051] The protective umbrella 1 is a self-expanding stent structure, and its material can be selected from superelastic materials such as nickel titanium. The protective umbrella 1 can be recovered and released to open. During transportation, it can be recovered into the transportation system. When it reaches the designated part of the blood vessel, the protective umbrella 1 can be released from the transportation system. After the release, the protective umbrella 1 will expand and open into an umbrella-shaped structure, and a capture space for capturing thrombus is formed inside. Since the protective umbrella 1 is detachably connected to the push rod 3, it can be temporarily implanted in the blood vessel, leaving sufficient space for the treatment of the stenosis. Among them, the detachable connection method can be selected as electromagnetic adsorption, snap connection or other reasonable and effective connection methods, as long as the detachability can be achieved, it is within the protection scope of the present invention.

[0052] In an optional embodiment of the present invention, the proximal end of the protective umbrella 1 and the distal end of the push rod 3 are connected by electromagnetic adsorption and separation. The electromagnetic adsorption and separation are used for connection, and the separation effect is relatively good. Specifically, it can be set to perform electromagnetic adsorption when power is turned on and separation when power is turned off. The operation is relatively simple.

[0053] like Figure 2 and Figure 3 As shown, in an optional embodiment of the present invention, an electromagnetic connector 2 is provided at the proximal end of the protective umbrella 1, and an electromagnetic assembly 4 is provided at the pushing rod 3. When the electromagnetic assembly 4 is powered on, the proximal end of the protective umbrella 1 is connected to the distal end of the pushing rod 3 under the electromagnetic action between the electromagnetic connector 2 and the electromagnetic assembly 4. When the electromagnetic assembly 4 is powered off, the proximal end of the protective umbrella 1 and the distal end of the pushing rod 3 are separated.

[0054] In this embodiment, by the on-off setting of the electromagnetic component 4, the electromagnetic component 4 generates magnetism opposite to that of the electromagnetic connector 2, or generates no magnetism, thereby achieving the effect of electromagnetic adsorption or non-electromagnetic separation. The specific structural setting of the electromagnetic component 4 is not limited here, as long as the above-mentioned effect can be achieved.

[0055] In a specific embodiment of the present invention, the electromagnetic component includes:

[0056] A battery 44, which is disposed at the proximal end of the push rod 3;

[0057] A plurality of iron cores 41, wherein the plurality of iron cores 41 are arranged at intervals along the circumference of the push rod 3 at the far end of the push rod 3;

[0058] a coil 42 , the coil 42 being wound around each core 41 and electrically connected to a battery 44 ;

[0059] The electromagnetic switch 43 is disposed at the proximal end of the push rod 3 and is electrically connected to the coil 42 and the battery 44 , and is used to control the power on or off of the coil 42 .

[0060] Specifically, the battery 44 is a storage battery, which can be a rechargeable battery, and is generally arranged as two batteries. The proximal end of the push rod 3 is provided with a placement groove for placing the battery 44, and the proximal end of the push rod 3 is also provided with a cover for covering the placement groove. The iron core 41 is in the shape of a long strip, and is arranged in multiple numbers, and is distributed along the circumference of the push rod 3. When specifically arranged, the inner wall of the distal end of the push rod 3 is provided with installation grooves along the circumference, and the iron core 41 is installed in the installation groove. Since the push rod 3 can be selected as a round rod, the iron core 41 and the installation groove can be selected as a long arc shape, which can facilitate the opening of the installation groove. Each iron core 41 is wound with a coil 42, and the coils 42 on each iron core 41 are connected in series. The coil 42 is electrically connected to the battery 44 at the distal end of the push rod 3 through a connecting wire, and the connecting wire is passed through the main body cavity 32 of the push rod 3. An assembly position is set at the proximal end of the push rod 3 near the battery 44 for assembling the electromagnetic switch 43. The electromagnetic switch 43 can be electrically connected to the coil 42 and the battery 44 through a connecting wire to control the power on or off of the coil 42. After the coil 42 is energized, the iron core 41 is magnetized to produce a magnetism opposite to that of the electromagnetic connector 2. In this way, under the electromagnetic action, the proximal end of the protective umbrella 1 is automatically adsorbed and connected to the distal end of the push rod 3 through the electromagnetic connector 2; after the coil 42 is de-energized, the iron core 41 loses its magnetism, so that the electromagnetic connector 2 automatically falls off, and the proximal end of the protective umbrella 1 is separated from the distal end of the push rod 3.

[0061] In order to ensure the installation convenience and firmness of the iron core 41 , optionally, the iron core 41 is fixed in the installation groove by gluing.

[0062] like Figure 3 As shown, in one embodiment of the present invention, the electromagnetic connector 2 includes a connecting rod 21 and a connecting ball 22 arranged at the proximal end of the connecting rod 21, the distal end of the connecting rod 21 is connected to the proximal end of the protective umbrella 1, and the connecting ball 22 is made of stainless steel; an auxiliary connecting assembly 15 is arranged at the proximal end of the protective umbrella 1, and the auxiliary connecting assembly 15 includes an outer tube 151 and an inner tube 152 which are mutually sleeved, the distal end of the connecting rod 21 is fixed in the inner tube 152, and the proximal end of the connecting rod 21 extends out of the inner tube 152, the outer tube 151 is a stainless steel tube, and the inner tube 152 is a platinum-iridium tube.

[0063] Specifically, the electromagnetic connector 2 is made of stainless steel, and its connecting rod 21 and connecting ball 22 can be selected as an integrated structure. The distal end of the connecting rod 21 is fixed in the inner tube 152 of the auxiliary connecting component 15 by soldering or glue, and the connecting ball 22 plays the role of connecting with the proximal end of the push rod 3. The distal end of the auxiliary connecting component 15 is fixed to the proximal end of the protective umbrella 1 by welding, and the outer tube 151 is a stainless steel tube, which can further increase the electromagnetic connection distance between the protective umbrella 1 and the push rod 3, making the connection more firm and ensuring the stability and reliability of the conveying process. The inner tube 152 is a platinum-iridium tube, which has good elasticity and is convenient for positioning the protective umbrella 1 during the recovery process.

[0064] like Figure 2 As shown, the push rod 3 is a hollow round rod, and a main body inner cavity 32 is formed inside it. A guide inner cavity 31 is formed inside the distal end of the push rod 3. The guide inner cavity 31 is connected to the main body inner cavity 32. The inner diameter of the guide inner cavity 31 decreases gradually along the direction toward the proximal end of the push rod 3, which can guide the adsorption connection of the electromagnetic connector 2.

[0065] like Figure 4 As shown, in one embodiment of the present invention, the protective umbrella 1 includes a supporting frame 11 and an elastic porous coating 12. The supporting frame 11 is a self-expanding stent. After the supporting frame 11 expands and opens, it forms a capture space with the elastic porous coating 12. The proximal end of the supporting frame 11 is detachably connected to the distal end of the pushing rod 3. The elastic porous coating 12 covers the distal surface of the supporting frame 11. The elastic porous coating 12 is provided with a plurality of through holes 121 connected to the capture space for blood flow to pass through and for capturing thrombus.

[0066] The material of the support frame 11 can be nickel-titanium alloy, which can be recovered and released. The material of the elastic porous coating 12 can be polyurethane, and the thickness range is 10-30μm (such as 10μm, 15μm, 20μm, 25μm, 30μm and the interval between any two endpoints). The thickness range can be used to effectively capture the thrombus, and the protective umbrella 1 has good strength and a long service life without affecting the recovery and release operation of the protective umbrella 1. The elastic porous coating 12 covers the distal part of the support frame 11 in an open manner. Optionally, the opening of the elastic porous coating 12 is located in the middle of the support frame 11, that is, the maximum diameter of the support frame 11 after expansion. The through hole 121 of the elastic porous membrane 12 is connected to the capture space, and the through hole 121 allows blood to flow smoothly and can capture thrombus. That is, the size of the through hole 121 is smaller than the size of the thrombus. In this way, after the detachable protective umbrella 1 is released into the blood vessel, the thrombus will fall into the capture space inside the protective umbrella 1.

[0067] In some embodiments of the present invention, the support skeleton 11 is a cylindrical structure cut from a nickel-titanium alloy tube and shaped by heat treatment; the support skeleton 11 includes a first tube segment 111, a plurality of support beams 112, and a second tube segment 113 connected to each other. After the plurality of support beams 112 expand and open, they are enclosed with the elastic porous film 12 to form a capture space. That is, the first tube segment 111 and the second tube segment 113 are both the two end tube segments left after the middle part of the nickel-titanium alloy tube is cut, and the middle part of the nickel-titanium alloy tube is cut into a support beam 112 structure. The specific structural setting of the support beam 112 is not limited. As long as it has good supporting force and the holes formed between adjacent support beams 112 can allow blood clots to pass through, it is within the protection of the present invention.

[0068] The auxiliary connection assembly 15 is connected to the second pipe section 113, and can be fixed by welding.

[0069] like Figure 4 and Figure 5 As shown, in some embodiments of the present invention, each support beam 112 extends from the first tube segment 111 to the second tube segment 113, and multiple support beams 112 are evenly distributed along the circumferential intervals of the first tube segment 111, that is, the two ends of the support beam 112 are respectively connected to the first tube segment 111 and the second tube segment 113, and the support beams 112 are not staggered. It should be noted that in the above-mentioned structure, the number of support beams 112 is different, and the corresponding radial support force of the protective umbrella 1 is also different. Optionally, the number of support beams 112 is 3-8 (such as 3, 4, 5, 6, 7 or 8). The more the number of support beams 112, the greater the corresponding radial support force of the protective umbrella 1. At the same time, the number of support beams 112 in blood vessels of different diameters is also different. For details, please refer to Table 1.

[0070] Table 1 Figure 4 Relationship between the number of support beams 112 and the radial support force between blood vessels and protective umbrella 1 under the connection mode

[0071]

[0072] like Figure 6 and Figure 7 As shown, in some other embodiments of the present invention, multiple support beams 112 are arranged in an alternating manner, and their specific structural shapes are not limited. As long as they can have good supporting force and the holes formed between adjacent support beams 112 can allow blood clots to pass through, they are all within the protection scope of the present invention.

[0073] In an optional embodiment of the present invention, the through hole 121 is a circular hole, and the diameter of the through hole 121 is 60-120 μm (for example, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm and an interval value between any two end points). The through hole 121 of this size can not only ensure the smooth passage of blood flow, but also effectively capture blood clots.

[0074] In some specific embodiments of the present invention, a non-porous section is provided at 1 mm at the farthest end of the elastic porous coating 12 to prevent the thrombus from falling off due to thrombus squeezing during the recovery process of the protective umbrella 1; along the direction from the far end of the elastic porous coating 12 to the proximal end of the elastic porous coating 12, the diameter of the through hole 121 gradually increases at intervals of 1 mm, and through holes 121 of different sizes are provided, and their diameters gradually increase from 60 μm to 120 μm, which can not only meet the smooth passage of blood flow, but also capture thrombi of different sizes. With such a design, after the detachable protective umbrella 1 is released into the blood vessel, all thrombi fall into the capture space of the protective umbrella 1, thereby improving the capture effect.

[0075] like Figure 8 and Fig. 9 As shown, in some other embodiments of the present invention, the protective umbrella 1 is woven with nickel-titanium braided wire; the protective umbrella 1 includes a braided body 13, the distal end of the braided body 13 is fixed by a first fixing tube 131, and the proximal end is fixed by a second fixing tube 132, and a capture space is formed inside the braided body 13 after it is expanded and opened, and a hole 13a connected to the capture space is formed on the proximal surface for the thrombus to pass into and flow into the capture space.

[0076] The auxiliary connection assembly 15 is connected to the second fixing pipe 132 , and can be fixed by welding.

[0077] Since the protective umbrella 1 is woven with nickel-titanium braided wire, the braiding density of the braided main body 13 is relatively small, that is, the mesh formed between the braided wires of the braided main body 13 is relatively small, which can capture blood clots. In this way, there is no need to coat the surface, the operation is relatively simple, and the production cost is relatively low. In addition, during the weaving process, holes 13a are formed on the proximal surface. The size of the holes 13a is not limited and can be reasonably adjusted according to the size of the protective umbrella 1. The holes 13a can allow blood clots to pass through and flow into the capture space. Optionally, the holes 13a formed by weaving are set to four, and the four holes 13a are symmetrically distributed, roughly leaf-shaped.

[0078] Optionally, the mesh aperture formed by the woven body 13 is 100-120 μm (such as 100 μm, 105 μm, 110 μm, 115 μm, 120 μm and interval values ​​between any two end points). The mesh is designed to be within this size range, which can not only ensure the smooth passage of blood flow, but also effectively capture blood clots.

[0079] like Figure 4 As shown, in some embodiments of the present invention, a developing assembly 14 is provided on the protective umbrella 1, and the developing assembly 14 is located at the maximum inner diameter of the protective umbrella 1 after it is opened.

[0080] The developing assembly 14 may be a developing wire, a developing ring or other reasonable shapes, and may be fixed at the maximum inner diameter of the protective umbrella 1 after it is opened by winding or gluing. Specifically, in an embodiment where the protective umbrella 1 includes a cut support beam 112, the developing assembly 14 is fixed at the maximum inner diameter of the support beam 112 after it is opened; in an embodiment where the protective umbrella 1 includes a braided braided main body 13 segment, the developing assembly 14 is fixed at the maximum inner diameter of the braided main body 13 after it is opened. The setting of the developing assembly 14 allows the surgical operator to clearly observe the opening of the protective umbrella 1 and the fit between the protective umbrella 1 and the blood vessel wall, thereby effectively determining whether there is a risk of displacement.

[0081] The use process of the remote protection device 100 of the present invention is as follows: Press the electromagnetic switch 43 of the electromagnetic assembly 4 to energize the coil 42. Fig.10 As shown, the protective umbrella 1 is automatically adsorbed on the distal end of the pushing rod 3 through the electromagnetic connector 2. The operator transports the protective umbrella 1 to the target blood vessel through the pushing rod 3. When the target position is reached, the electromagnetic switch 43 of the electromagnetic component 4 is pressed to cut off the power to the coil 42. At this time, the electromagnetic connector 2 automatically falls off, and the protective umbrella 1 is separated from the pushing rod 3. The protective umbrella 1 is temporarily installed at the target position in the blood vessel (i.e., the part to be treated). After the protective umbrella 1 is released, it expands and opens to fit the blood vessel wall (because the material of the protective umbrella 1 can be selected from superelastic materials such as nickel-titanium, and nickel-titanium alloy is self-expanding). After expansion, the protective umbrella 1 is olive-shaped (the middle part of the protective umbrella 1 expands outward) to capture the thrombus. At the same time, the push rod 3 is withdrawn, and the vascular space at the required treatment site is vacated, and a stent with its own delivery system can also be used for treatment; after the stenosis treatment is completed, the push rod 3 is transported to the protective umbrella 1 again, and the electromagnetic switch 43 is pressed again at the proximal end to energize the coil 42. The protective umbrella 1 is automatically adsorbed on the distal end of the push rod 3 again through the electromagnetic connector 2, and the push rod 3 and the protective umbrella 1 are recovered together and withdrawn from the body.

[0082] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

[0083] The above is a description of the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above-mentioned description of the embodiments for the convenience of ordinary technicians in the technical field to understand and use the invention. It is obvious that those familiar with the technology in the field can easily make various modifications to these embodiments and apply the general principles described here to other embodiments without creative work. Therefore, the present invention is not limited to the above-mentioned embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the protection scope of the present invention.

Claims

1. A detachable remote protection device, characterized in that: The distal protection device comprises a pushing rod and a protection umbrella, wherein the protection umbrella is detachably connected to the pushing rod and is a self-expanding structure. After the protection umbrella expands and opens, a capture space for capturing thrombus is formed inside.

2. The detachable distal protection device according to claim 1, characterized in that: The proximal end of the protective umbrella is connected to the distal end of the pushing rod by electromagnetic adsorption separation.

3. The detachable distal protection device according to claim 1, characterized in that: An electromagnetic connector is provided at the proximal end of the protective umbrella, and an electromagnetic assembly is provided at the pushing rod; When the electromagnetic assembly is powered on, the proximal end of the protective umbrella is connected to the distal end of the push rod under the electromagnetic action between the electromagnetic connector and the electromagnetic assembly; When the electromagnetic assembly is powered off, the proximal end of the protective umbrella and the distal end of the pushing rod are separated.

4. The detachable distal protection device according to claim 3, characterized in that: The electromagnetic assembly comprises: A battery, wherein the battery is disposed at the proximal end of the push rod; A plurality of iron cores, wherein the plurality of iron cores are arranged at a distal end of the push rod at intervals along the circumference of the push rod; a coil, the coil being wound around each of the iron cores and being electrically connected to the battery; An electromagnetic switch is arranged at the proximal end of the push rod and is electrically connected to the coil and the battery, and is used to control the power on or off of the coil.

5. The detachable distal protection device according to claim 3, characterized in that: The electromagnetic connector includes a connecting rod and a connecting ball arranged at the proximal end of the connecting rod, the distal end of the connecting rod is connected to the proximal end of the protective umbrella, and the connecting ball is made of stainless steel; An auxiliary connection assembly is arranged at the proximal end of the protective umbrella, and the auxiliary connection assembly comprises an outer tube and an inner tube which are sleeved on each other, the connection rod is fixed in the inner tube, the outer tube is a stainless steel tube, and the inner tube is a platinum-iridium tube.

6. The detachable distal protection device according to any one of claims 1 to 5, characterized in that: The protective umbrella includes a supporting frame and an elastic porous coating. The supporting frame is a self-expanding stent. After the supporting frame expands and opens, it forms the capturing space with the elastic porous coating. The proximal end of the supporting frame can be detachably connected to the distal end of the pushing rod. The elastic porous coating covers the distal surface of the supporting frame. The elastic porous coating is provided with a plurality of through holes connected to the capturing space for blood flow to pass through and for capturing thrombus.

7. The detachable distal protection device according to claim 6, characterized in that: The support frame is a cylindrical structure cut from a nickel-titanium alloy tube and shaped by heat treatment; The support frame includes a first pipe section, a plurality of support beams and a second pipe section which are connected to each other. After the plurality of support beams are expanded and opened, they are enclosed with the elastic porous membrane to form the capture space.

8. The detachable distal protection device according to claim 6, characterized in that: The through hole is a circular hole, and the diameter of the through hole is 60-120 μm; Along the direction from the distal end of the elastic porous membrane to the proximal end of the elastic porous membrane, the diameter of the through hole gradually increases at intervals of 1 mm.

9. The detachable distal protection device according to any one of claims 1 to 5, characterized in that: The protective umbrella is woven from nickel-titanium braided wire; The protective umbrella comprises a braided body, a first fixing tube and a second fixing tube are respectively arranged at the distal end and the proximal end of the braided body, the braided body is expanded and opened to form the capture space inside, and a hole connected to the capture space is formed on the proximal surface to allow the thrombus to pass through and flow into the capture space; The mesh aperture formed by the braided main body is 100-120 μm.

10. The detachable distal protection device according to any one of claims 1 to 5, characterized in that: The protective umbrella is provided with a developing assembly, and the developing assembly is located at the maximum inner diameter of the protective umbrella after it is opened.

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