A guidewire-independent distal embolic protector

Abstract

The present invention provides a guidewire-independent distal embolic protector, which relates to the technical field of medical devices, and includes a guidewire and a protective umbrella. The protective umbrella is coaxially arranged with the guidewire, and the guidewire can slide relative to the protective umbrella. The proximal end and / or distal end of the protective umbrella is provided with a clamping assembly, and the clamping assembly is used to fix the protective umbrella relative to the guidewire. The cross-section of the guidewire is a shape other than a circle. When the guidewire is rotated along a first preset direction, the clamping assembly clamps the guidewire, and when the guidewire is rotated along a second preset direction, the clamping assembly releases the guidewire. The present invention adopts a guidewire that can be separated / locked from the protective umbrella, which can replace the guide guidewire and be used for conveying a delivery catheter loaded with a protective umbrella. After being locked with the protective umbrella, the protective umbrella can be pushed out of the delivery catheter for release. It can also be used for guiding thrombus aspiration equipment, so that there is no need to implant guidewires and catheters multiple times, and solve the problem of vascular damage caused by the use of the embolic protection device.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices, and in particular relates to a guidewire-independent distal embolic protector. Background Art

[0002] When interventional treatment is used to treat vascular embolic diseases, the narrowed area of ​​the blood vessels often causes embolism of distal small-caliber blood vessels or tissues due to the detachment of emboli or tissue, which significantly increases the risk of surgical complications. To address this problem, an embolic protection device has been proposed clinically. Without affecting the normal flow of blood, the device can deploy a filter at the distal end of the lesion segment to intercept and collect detached emboli. After the operation is completed, the device and the emboli it intercepted can be withdrawn from the body together. The use of this device significantly reduces the risk of distal embolism, thereby improving the success rate of the operation.

[0003] Existing embolic protection devices can be divided into two categories according to the delivery sheath. One is that the delivery sheath and the retrieval sheath are independent of each other, and the other is that the delivery sheath and the retrieval sheath are integrated into one delivery / retrieval sheath. The former is represented by the FilterWireEZ thrombus protection device. When delivering the protective umbrella, this type of device first passes the guide wire through the lesion, and then puts the guide catheter along the guide wire. After the guide catheter is in place, the guide wire is withdrawn, and then the protective umbrella and the protective umbrella guide wire are pressed and grasped into the delivery sheath. After the delivery sheath is in place in the guide catheter, the protective umbrella is released, and then the delivery sheath and the guide catheter are withdrawn. When retrieving the protective umbrella, take out the retrieval sheath and advance along the protective umbrella guide wire to the proximal end of the protective umbrella, and then pull the protective umbrella guide wire toward the proximal end to retract the protective umbrella into the retrieval sheath, and then withdraw the retrieval sheath. The latter is represented by the SpiderFX protective umbrella and the EmboCatcherTM Xinwei Linglong protective umbrella. The delivery sheath and the retrieval sheath are integrated into one, such as Figure 1 As shown, the integrated catheter adopts rapid exchange technology. During delivery, the guide wire is first guided into place, and then the protective umbrella device is pressed to the loading section. The proximal end of the guide wire enters from the delivery port and passes through the main guide wire outlet. After the delivery tube is in place, the guide wire is withdrawn and the protective umbrella is released from the loading section. When recovering, it is recovered from the recovery end along the protective umbrella guide wire. Compared with the former, this delivery method saves the guide catheter, but still requires a guide wire.

[0004] It can be seen that the mainstream protective umbrellas on the market currently require a guide wire during delivery. During clinical operations, each additional implantation of a guide wire or catheter will cause the risk of damage to the blood vessels, so it is necessary to simplify the protective umbrella delivery process. Summary of the invention

[0005] The purpose of the present invention is to provide a guidewire-independent distal embolic protector that can use one guidewire to complete the guidance, release and recovery of the protective umbrella without the need for a guide catheter, so as to solve the problem of vascular damage caused by multiple implantation of guidewires and catheters during the use of the embolic protection device.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A guidewire-independent distal embolic protector comprises a guidewire and a protective umbrella, wherein the protective umbrella is coaxially arranged with the guidewire and the guidewire can slide relative to the protective umbrella. A clamping assembly is provided at the proximal end and / or the distal end of the protective umbrella, and the clamping assembly is used to fix the protective umbrella relative to the guidewire.

[0008] Preferably, the cross-section of the guide wire is a shape other than a circle, and when the guide wire is rotated along a first preset direction, the clamping assembly clamps the guide wire, and when the guide wire is rotated along a second preset direction, the clamping assembly releases the guide wire.

[0009] Preferably, the clamping assembly includes a sleeve and a screw, the sleeve and the screw are threadedly connected, the guide wire passes through the screw axially, and a limiting portion is provided at the proximal end of the screw, and when the limiting portion enters the sleeve, the limiting portion clamps the guide wire.

[0010] Preferably, the limiting portion is in a truncated cone shape, and the cross-sectional diameter of the limiting portion gradually increases toward the proximal direction.

[0011] Preferably, the cross-sectional profile of the guide wire is at least a straight line.

[0012] Preferably, the cross-sectional profile of the guidewire is selected from a rectangle, a rounded rectangle or a rectangle including a set of arc edges.

[0013] Preferably, the protective umbrella comprises a support and a filter membrane, and the filter membrane is arranged at the distal end of the support.

[0014] Preferably, the distal end and the proximal end of the filter membrane are wrapped around the outside of the support, and the portion of the filter membrane between the distal end and the proximal end is located inside the support.

[0015] Preferably, a first developing point is provided at the distal end of the bracket, a second developing point is provided at the proximal end of the bracket, and a plurality of third developing points are provided at the middle portion of the bracket.

[0016] Preferably, a plurality of fourth developing points are provided at the distal end of the guide wire, and the fourth developing points are embedded in the surface of the guide wire.

[0017] Beneficial effects:

[0018] (1) The distal embolic protector of the present invention includes a guide wire that can be separated from / locked with the protective umbrella. In the separated state, the guide wire can replace the guide wire to guide into place, and then the delivery catheter loaded with the protective umbrella is delivered along the guide wire. The guide wire is then rotated to lock with the protective umbrella, and the protective umbrella can be pushed out of the delivery catheter through the guide wire to complete the release. After the release is completed, the guide wire is unlocked and can also be used to guide the thrombus aspiration device, and avoid the problem of vascular spasm caused by the axial movement of the protective umbrella when the subsequent device is implanted;

[0019] (2) The present invention provides a filter membrane at the distal end of the protective umbrella stent, and utilizes the filter membrane to reduce the escape of thrombus through the stent. Moreover, by allowing the stent to pass through the area between the distal end and the proximal end of the filter membrane, the stent supports the filter membrane, thereby preventing the filter membrane from falling off the stent due to the impact of blood flow.

[0020] (3) The present invention also provides a plurality of third developing points in the middle of the stent, and the relative positions of these third developing points can be used to judge the opening degree and the wall adhesion state of the stent;

[0021] (4) A fourth imaging point is also set at the distal end of the guide wire. The fourth imaging point adopts an embedded structure, which can not only be used to determine the distal end position of the guide wire, but also does not produce a bulge and will not affect the passability of the guide wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. Among them:

[0023] Figure 1 It is a schematic diagram of the operation of an existing integrated catheter-type embolic protection device.

[0024] Figure 2 This is a front view of a guidewire-independent distal embolic protector provided in Example 1 of the present invention.

[0025] Figure 3 It is a three-dimensional structural diagram of the clamping assembly in the present invention.

[0026] Figure 4 It is a schematic diagram of the cross-sectional profile of the guide wire in the present invention.

[0027] Figure 5 This is a front view of the structure of the clamping assembly in the present invention, in which the limiting portion does not enter the sleeve.

[0028] Figure 6 This is a front structural diagram of the clamping assembly in the present invention, in which the limiting portion enters the sleeve.

[0029] Figure 7 It is a front view schematic diagram of a delivery catheter matching the present invention.

[0030] Figure 8 A stereoscopic diagram of a guidewire-independent distal embolic protector provided in Example 2 of the present invention.

[0031] Fig. 9 for Figure 8 Enlarged view of point A in the middle.

[0032] Fig.10 This is a three-dimensional diagram of a guidewire-independent distal embolic protector provided in Example 2 of the present invention, in which the filter membrane is hidden.

[0033] In the figure: 100, guide wire; 200, protective umbrella; 300, delivery catheter; 400, clamping assembly; 101, fourth development point; 201, bracket; 202, first development point; 203, second development point; 204, filter membrane; 205, third development point; 301, delivery end; 302, recovery end; 303, loading section; 401, sleeve; 402, screw; 403, limit part. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0035] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0036] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more features.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly stipulated and limited, the term "connection" should be understood in a broad sense. For example, it can be a fixed connection or a movable connection, a detachable connection or a non-detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be internal connection between two elements, indirect connection, or an interactive relationship between two elements.

[0039] The present invention will be described in detail below in conjunction with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0040] In view of the problem that the current distal embolic protector needs to transport guidewires and catheters multiple times during use, the present invention provides a distal embolic protector with independent guidewires, so as to reduce the number of times the guidewires and catheters are transported during the transportation, release and recovery of the protective umbrella, thereby reducing the damage caused by the friction of the guidewires and catheters on the blood vessel wall, shortening the operation time of the distal embolic protector, and improving the surgical efficiency.

[0041] like Figures 2 to 6 As shown, the present invention provides a guidewire-independent distal embolic protector, which includes a guidewire 100 and a protective umbrella 200. The protective umbrella 200 is coaxially arranged with the guidewire 100, and the guidewire 100 can slide relative to the protective umbrella 200. The proximal end and / or distal end of the protective umbrella 200 is provided with a clamping assembly 400, and the clamping assembly 400 is used to fix the protective umbrella 200 and the guidewire 100 relatively.

[0042] like Figure 2 As shown, the protective umbrella 200 includes a stent 201 for intercepting thrombus, a first developing point 202 is provided at the distal end of the stent 201, and a second developing point 203 is provided at the proximal end of the stent 201, so as to facilitate the determination of the position of the stent 201 in the blood vessel and facilitate the operation.

[0043] Specifically, Figure 3 , 5 As shown in FIG. 6 , the clamping assembly 400 includes a sleeve 401 and a screw 402 . The sleeve 401 and the screw 402 are connected by threads. A limiting portion 403 is provided at the proximal end of the screw 402 . The guide wire 100 passes through the screw 402 and the limiting portion 403 axially.

[0044] In a preferred embodiment of the present invention, the limiting portion 403 is in a truncated cone shape, and the cross-sectional diameter of the limiting portion 403 gradually increases toward the proximal direction. Figure 4As shown, the cross-section of the guidewire 100 is a shape other than a circle. In a preferred embodiment of the present invention, the cross-sectional profile of the guidewire 100 is at least a straight line; more preferably, the cross-sectional profile of the guidewire 100 is selected from a rectangle, a rounded rectangle, or a rectangle including a group of arc edges to reduce the scraping damage of the edges of the guidewire 100 to the blood vessel wall.

[0045] Since the cross-sectional shape of the guide wire 100 is not circular, rotating the guide wire 100 can drive the limiting portion 403 to rotate and make the screw 402 enter or leave the sleeve 401. Figure 6 As shown, when the limiting portion 403 enters the sleeve 401 along with the screw 402 , the limiting portion 403 will be squeezed due to its diameter being larger than the inner hole diameter of the sleeve 401 , thereby clamping the guide wire 100 and preventing the guide wire 100 from moving axially relative to the limiting portion 403 .

[0046] In the present invention, when the guide wire 100 is rotated along a first preset direction, the clamping assembly 400 clamps the guide wire 100, and when the guide wire 100 is rotated along a second preset direction, the clamping assembly 400 loosens the guide wire 100. The first preset direction is opposite to the second preset direction, and the first preset direction can be either counterclockwise or clockwise. Generally, the first preset direction is set to counterclockwise to conform to the habitual rotation direction of people when using the screw 402.

[0047] It can be seen that the present invention adopts a guide wire 100 that can be separated / locked from the protective umbrella 200, which can replace the guide wire 100 to be guided into place and used to transport the delivery catheter 300 loaded with the protective umbrella 200. After the guide wire 100 and the protective umbrella 200 are locked, the protective umbrella 200 can be pushed out of the delivery catheter 300 for release, and can also be used for guiding thrombus aspiration equipment, thereby eliminating the need to implant the guide wire 100 and the catheter multiple times, thereby solving the problem of vascular damage caused by the use of the embolic protection device.

[0048] Another object of the present invention is to provide a guidewire-independent distal embolic protector to solve the problem of distal thrombus escape. Figures 8 to 10 As shown, on the basis of the above scheme, the protective umbrella 200 includes a bracket 201 and a filter membrane 204, and the filter membrane 204 is arranged at the distal end of the bracket 201. In this scheme, the filter membrane 204 is used instead of the bracket 201 to intercept thrombus and filter blood flow, and the bracket 201 mainly plays the role of supporting the filter membrane 204.

[0049] In a preferred embodiment of the present invention, Figure 8 As shown, the distal and proximal ends of the filter membrane 204 are wrapped around the outside of the stent 201, and the portion of the filter membrane 204 between the distal and proximal ends is located on the inside of the stent 201, so that part of the structure of the stent 201 passes through the filter membrane 204. Since the material of the filter membrane 204 is relatively soft, this arrangement can prevent the filter membrane 204 from falling off the stent 201 under the impact of blood flow.

[0050] In a preferred embodiment of the present invention, a plurality of third developing points 205 are provided in the middle of the bracket 201. The third developing points 205 are evenly arranged along the circumference of the bracket 201, and can be used to determine whether the bracket 201 is fully opened and the filter membrane 204 is attached to the wall. When recycling, it can be used to determine whether the bracket 201 is tightened.

[0051] In a preferred embodiment of the present invention, a plurality of fourth developing points 101 are provided at the distal end of the guide wire 100 for determining the position of the distal end of the guide wire 100. The fourth developing points 101 are embedded in the surface of the guide wire 100 and are flush with the surface of the guide wire 100, and do not affect the movement of the guide wire 100 and passing through various components.

[0052] The following is a detailed description of a guidewire-independent distal embolic protector of the present invention through specific embodiments.

[0053] Example 1

[0054] The present embodiment provides a guidewire-independent distal embolic protector to reduce the number of times the guidewire and catheter are transported by the protective umbrella during the delivery, release and recovery process. As shown in the figure, the distal embolic protector includes a guidewire 100 and a protective umbrella 200, wherein the protective umbrella 200 is coaxially arranged with the guidewire 100, the guidewire 100 passes through the distal end and the proximal end of the protective umbrella 200, and can slide relative to the protective umbrella 200, the protective umbrella 200 includes a bracket 201 for filtering thrombus, and the proximal end of the protective umbrella 200 is connected to a clamping assembly 400, when it is necessary to push or recover the protective umbrella 200 through the guidewire 100, the protective umbrella 200 can be fixed to the guidewire 100 through the clamping assembly 400.

[0055] Specifically, in order to achieve locking between the protective umbrella 200 and the guide wire 100, the cross-sectional shape of the guide wire 100 in this embodiment is rectangular, so that the guide wire 100 is in the shape of a flat wire; at the same time, the clamping assembly 400 includes a sleeve 401 and a screw 402, and the sleeve 401 and the screw 402 are connected by threads. A channel for the guide wire 100 to pass through is provided in the middle of the screw 402, so that the guide wire 100 passes through the screw 402 axially. Through this arrangement, when the guide wire 100 is rotated, the screw 402 can be driven to rotate. Due to the threaded connection between the sleeve 401 and the screw 402, the screw 402 can then enter or leave the sleeve 401.

[0056] Furthermore, a limiting portion 403 is connected to the proximal end of the screw rod 402. The limiting portion 403 is in a truncated cone shape, and the cross-sectional diameter of the limiting portion 403 gradually increases toward the proximal direction. When the limiting portion 403 enters the sleeve 401, the limiting portion 403 is squeezed by the sleeve 401, thereby clamping the guide wire 100, so that the proximal end of the protective umbrella 200 is fixed on the guide wire 100. At this time, moving the guide wire 100 forward and backward can drive the protective umbrella 200 to move synchronously.

[0057] In this embodiment, a first developing point 202 is provided at the distal end of the bracket 201 , and a second developing point 203 is provided at the proximal end of the bracket 201 , which are used to determine the position of the bracket 201 .

[0058] The guidewire-independent distal embolic protector provided in this embodiment has the following operation method:

[0059] Umbrella Loading:

[0060] The protective umbrella is pressed and held in the delivery catheter 300 before use. The structure of the delivery catheter 300 is as follows: Figure 7 As shown, the distal end is the delivery end 301, the proximal end is the recovery end 302, and a transparent loading section 303 is provided at the portion of the delivery catheter 300 close to the delivery end 301. When loading, the guide wire 100 is first rotated along the first preset direction so that the limiting portion 403 enters the sleeve 401 to clamp the guide wire 100. After the protective umbrella 200 and the guide wire 100 are fixed, the proximal end of the guide wire 100 is introduced from the delivery end 301 of the delivery catheter 300 and passed out from the recovery end 302. The guide wire 100 is pulled so that the protective umbrella 200 enters the delivery end 301 and reaches the loading section 303, and the loading of the protective umbrella 200 is completed.

[0061] Guidewire first:

[0062] Before the operation, the guide wire 100 is rotated along the second preset direction so that the limiting portion 403 leaves the sleeve 401 and the protective umbrella 200 is separated from the guide wire 100. At this time, the guide wire 100 can freely enter and exit the delivery catheter 300, while the protective umbrella 200 remains in the delivery catheter 300. Then the distal end of the guide wire 100 is implanted from the Y valve and moves along the blood vessel until it passes through the thrombus at the lesion site.

[0063] Guidewire-Guided Delivery Catheter:

[0064] After the guide wire 100 is in place first, the proximal end of the guide wire 100 is fixed, and the delivery catheter 300 is pushed to move along the guide wire 100 toward the distal end, and the delivery catheter 300 loaded with the protective umbrella 200 is pushed into place.

[0065] Release the umbrella:

[0066] After the protective umbrella 200 is delivered to the position, the guide wire 100 is rotated along the first preset direction so that the clamping assembly 400 locks the guide wire 100 again. When the guide wire 100 cannot continue to rotate, the guide wire 100 is kept stationary and the delivery catheter 300 is withdrawn at the same time, so that the protective umbrella 200 can be released from the delivery end 301 of the delivery catheter 300.

[0067] Release the guidewire:

[0068] After the release of the protective umbrella 200 is completed, the guide wire 100 is rotated along the second preset direction so that the clamping assembly 400 loosens the guide wire 100, and then subsequent instruments such as the suction catheter can be delivered through the guide wire 100. When delivering subsequent instruments and aspirating thrombus, the guide wire 100 can be prevented from driving the protective umbrella 200 to move axially, so as to prevent the protective umbrella 200 attached to the blood vessel wall from scraping the blood vessel wall and preventing vascular spasm.

[0069] Recycling Umbrella:

[0070] After completing the thrombus aspiration, it is only necessary to rotate the guide wire 100 along the first preset direction so that the clamping assembly 400 locks the guide wire 100, and then transport the recovery end 302 of the delivery catheter 300 to the protective umbrella 200, and then keep the delivery catheter 300 stationary and pull the guide wire 100 in the proximal direction to recover the protective umbrella 200 into the delivery catheter 300.

[0071] Example 2

[0072] The present embodiment is improved on the basis of the first embodiment to solve the problem that the edge of the rectangular guidewire 100 may scrape the blood vessel wall. Specifically, in the present embodiment, the cross-sectional profile of the guidewire 100 adopts a rounded rectangle to eliminate the sharp edges of the guidewire 100, so as to prevent the edges of the guidewire 100 from damaging the inner wall of the blood vessel when the guidewire 100 moves in the blood vessel.

[0073] Example 3

[0074] The present embodiment is improved on the basis of the embodiment 1 to solve the problem of thrombus escape at the distal end of the protective umbrella 200. Specifically, in the present embodiment, the protective umbrella 200 includes a bracket 201 and a filter membrane 204. The bracket 201 is composed of 4 groups of 8-shaped braided wires evenly arranged circumferentially, which play the role of supporting the filter membrane 204. The filter membrane 204 is arranged on the distal side of the bracket 201 and completely covers the distal end of the filter. When the bracket 201 is expanded, the filter membrane 204 is expanded accordingly, and replaces the bracket 201 for filtering at the distal end of the filter. The proximal end of the filter membrane 204 is attached to the wall of the blood vessel after expansion to prevent the escape of thrombus. The pore size of the filter membrane 204 in the present embodiment is preferably 80 μm.

[0075] In this embodiment, a plurality of third developing points 205 are provided in the middle of the bracket 201. The third developing points 205 are evenly arranged along the circumference of the bracket 201 and can be used to determine whether the bracket 201 is fully opened and the filter membrane 204 is attached to the wall. When recycling, they can be used to determine whether the bracket 201 is tightened.

[0076] When the protective umbrella 200 is recovered, the existing dense mesh stent 201 will be compressed and squeeze the thrombus intercepted inside the stent 201, which may cause the thrombus to be squeezed out of the stent 201. At this time, the filter membrane 204 can intercept the thrombus escaping from the stent 201 and prevent it from entering the narrower blood vessels at the distal end.

[0077] In this embodiment, in order to make the filter membrane 204 fit closely with the support 201, the distal end and the proximal end of the filter membrane 204 are wrapped around the outside of the support 201, and the portion of the filter membrane 204 between the distal end and the proximal end is located on the inside of the support 201, that is, the support 201 passes through the filter membrane 204 at the middle boundary of the filter membrane 204. Through this arrangement, the proximal end of the filter membrane 204 is located on the outside of the support 201, and has better wall adhesion than the support 201, while the support 201 on the outside of the middle part of the filter membrane 204 can play a supporting role, thereby preventing the filter membrane 204 from falling off the support 201 under the impact of blood flow.

[0078] Example 4

[0079] This embodiment is improved on the basis of embodiment 3, and the difference lies in that a plurality of fourth developing points 101 are provided at the distal end of the guide wire 100, and the fourth developing points 101 are embedded in the surface of the guide wire 100. The fourth developing points 101 adopt an embedded structure, which can not only be used to determine the distal position of the guide wire 100, but also does not produce protrusions and will not affect the passability of the guide wire 100.

[0080] In summary:

[0081] The present invention adopts a guide wire 100 that can be separated / locked from the protective umbrella 200, which can replace the guide wire 100 to guide it into place and be used to transport the delivery catheter 300 loaded with the protective umbrella 200. After the guide wire 100 is locked with the protective umbrella 200, the protective umbrella 200 can be pushed out of the delivery catheter 300 for release, and can also be used to guide the thrombus suction device, so that there is no need to implant the guide wire 100 and the catheter multiple times, solving the problem of vascular damage caused by the use of the embolic protection device. In addition, by setting a filter membrane 204 at the distal end of the protective umbrella 200 bracket 201, the filter membrane 204 is used to reduce the escape of thrombus through the bracket 201, and by allowing the bracket 201 to pass through the area between the distal end and the proximal end of the filter membrane 204, the bracket 201 supports the filter membrane 204, thereby preventing the filter membrane 204 from falling off the bracket 201 due to the impact of blood flow.

[0082] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A guidewire-independent distal embolic protector, comprising a guidewire and a protective umbrella, characterized in that: The protective umbrella is coaxially arranged with the guide wire, the guide wire can slide relative to the protective umbrella, and a clamping assembly is provided at the proximal end and / or the distal end of the protective umbrella, and the clamping assembly is used to fix the protective umbrella and the guide wire relatively; The cross section of the guide wire is a shape other than a circle, and when the guide wire is rotated along a first preset direction, the clamping assembly clamps the guide wire, and when the guide wire is rotated along a second preset direction, the clamping assembly releases the guide wire; The cross section of the guide wire is a rounded rectangle; The protective umbrella includes a support and a filter membrane, wherein the filter membrane is arranged at the distal end of the support, the distal end and the proximal end of the filter membrane are wrapped around the outside of the support, and the portion of the filter membrane located between the distal end and the proximal end is located inside the support; The clamping assembly includes a sleeve and a screw, wherein the sleeve and the screw are connected by threads, the guide wire passes through the screw in the axial direction, and a limiting portion is provided at the proximal end of the screw, and when the limiting portion enters the sleeve, the limiting portion clamps the guide wire; The limiting portion is in a truncated cone shape, and the cross-sectional diameter of the limiting portion gradually increases toward the proximal direction.

2. A guidewire-independent distal embolic protector according to claim 1, characterized in that: The distal end of the support is provided with a first developing point, the proximal end of the support is provided with a second developing point, and the middle part of the support is provided with a plurality of third developing points.

3. A guidewire-independent distal embolic protector according to claim 2, characterized in that: The distal end of the guide wire is provided with a plurality of fourth developing points, and the fourth developing points are embedded in the surface of the guide wire.

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