Far-end protector

Abstract

The utility model discloses a far-end protector, which belongs to the technical field of medical equipment and comprises a mandrel, an umbrella framework and an umbrella film, and first limiting structures are axially distributed on the mandrel; the closing end of the umbrella framework is fixedly connected to the near end of the core shaft, and the flaring end of the umbrella framework faces the far end of the core shaft; the umbrella membrane is provided with filtering holes for blood circulation, the opening end of the umbrella membrane is connected with the flaring end in a wrapping mode, the opening end faces the near end of the core shaft, the closed end of the umbrella membrane is connected with a sliding block, and the sliding block is provided with a second limiting structure matched with the first limiting structure. According to the utility model, the slide block slides on the mandrel, so that the size of the inner volume of the umbrella membrane can be changed, the umbrella membrane with the proper volume can be adjusted according to the blood vessel anatomical structures and lesion characteristics of different patients, and the safety and effectiveness of an operation are further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a remote protector. Background Art

[0002] In interventional treatments for cardiovascular diseases, preventing distal vascular embolism caused by detached thrombi and atherosclerotic plaque fragments is a key step in improving treatment success rates and reducing complications. As an innovative treatment aid, the distal protection device effectively prevents adverse phenomena such as no-reflow and slow blood flow by collecting and removing detached thrombi and plaque fragments during surgery. Its application value is particularly significant for high-risk patients, such as those with large and long-standing fresh thrombi in their coronary arteries. This device not only reduces thrombotic events and prevents infarction expansion in the short term, but also improves patient prognosis and quality of life in the long term.

[0003] However, the distal protection devices currently widely used in the market, such as balloon occlusion protection devices and filter protection devices, although they meet clinical needs to a certain extent, still have many limitations. Specifically, the cavity design of the protective umbrella (usually refers to the capture component in the filter protection device) is often small and fixed, and cannot be adjusted according to the actual situation of the lesion, which limits its efficiency and effectiveness in dealing with large or large-sized thrombus fragments. At the same time, the length of the protective umbrella body is fixed and long, which not only increases the complexity of the surgical operation, but may also cause unnecessary mechanical damage to the distal blood vessels, affecting the treatment effect.

[0004] In view of the above-mentioned technical defects, how to adapt to the vascular anatomical structure and pathological characteristics of different patients and improve the safety and effectiveness of surgery is a technical problem that needs to be solved in this field. Utility Model Content

[0005] The purpose of the present utility model is to provide a distal protector to solve the problems existing in the above-mentioned prior art. By sliding the slider on the core shaft, the size of the volume inside the umbrella membrane can be changed, so that the umbrella membrane can be adjusted to an appropriate volume size according to the vascular anatomical structure and lesion characteristics of different patients, thereby improving the safety and effectiveness of the operation.

[0006] To achieve the above purpose, the present invention provides the following solutions:

[0007] The utility model provides a distal protector, comprising a core shaft, an umbrella frame and an umbrella membrane, wherein a first limiting structure is distributed axially on the core shaft; the closed end of the umbrella frame is fixedly connected to the proximal end of the core shaft, and the flared end of the umbrella frame faces the distal end of the core shaft; the umbrella membrane has filtering holes for blood circulation, the open end of the umbrella membrane covers and is connected to the flared end, and the open end faces the proximal end of the core shaft, the closed end of the umbrella membrane is connected to a slider, and the slider is provided with a second limiting structure that cooperates with the first limiting structure.

[0008] In one embodiment, the slider is an annular block.

[0009] In one embodiment, the first limiting structure is a radial protrusion provided on the core shaft, and the second limiting structure is a groove provided on the inner diameter side of the annular block; or, the first limiting structure is a groove provided on the core shaft, and the second limiting structure is a radial protrusion provided on the inner diameter side of the annular block.

[0010] In one embodiment, the annular block is made of a developing material.

[0011] In one embodiment, it also includes a proximal developing ring, a middle developing ring and a distal developing ring, wherein the proximal developing ring is arranged at the proximal end of the core shaft, the middle developing ring is arranged at the flared end of the umbrella frame, and the distal developing ring is arranged at the distal end of the core shaft.

[0012] In one embodiment, the umbrella frame includes elastic Y-shaped frames distributed along the circumference, adjacent Y-shaped frames are connected through top branches thereof, and the bottom trunks of the Y-shaped frames are connected to the core shaft.

[0013] In one embodiment, when the umbrella frame is in an open state, the bottom trunk is Z-shaped, the upper arm and the lower arm of the Z-shape are parallel to the core shaft, and the lower arm is connected to the core shaft.

[0014] In one embodiment, a fixing ring is further included, wherein the fixing ring is sleeved on the core shaft, and the lower support arm is located in the gap between the fixing ring and the core shaft.

[0015] In one embodiment, the open end covers and connects to the top branch, and the axial length of the top branch is smaller than the axial length of the umbrella membrane.

[0016] In one embodiment, the umbrella film has a straight extension section or a gently sloping extension section from the open end to the closed end, and the closed end has an arc-shaped closing surface.

[0017] Compared with the prior art, the utility model has achieved the following technical effects:

[0018] The open end of the umbrella membrane of the utility model covers the flared end connected to the umbrella frame, and the umbrella frame is not provided on the side of the umbrella membrane away from the open end, so that the axial position of the umbrella membrane on the core shaft can be changed by sliding the slider on the core shaft, thereby changing the size of the volume inside the umbrella membrane, so that the umbrella membrane with appropriate axial length and volume can be adjusted according to the vascular anatomical structure and pathological characteristics of different patients, and the position is fixed by the cooperation of the first limiting structure and the second limiting structure, thereby ultimately improving the safety and effectiveness of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. 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 these drawings without paying any creative work.

[0020] Figure 1 This is a schematic diagram of the maximum capacity of an embodiment of the utility model;

[0021] Figure 2 for Figure 1 Axial cross-section view;

[0022] Figure 3 This is a schematic diagram of the minimum capacity of an embodiment of the utility model;

[0023] Figure 4 for Figure 3 Axial cross-section view;

[0024] Figure 5 This is a schematic diagram of the umbrella frame and the middle developing ring of the embodiment of the utility model;

[0025] Figure 6 This is a schematic diagram of the core shaft of an embodiment of the utility model;

[0026] Figure 7 This is a schematic diagram of a slider according to an embodiment of the present utility model;

[0027] Among them, 1. distal developing ring; 2. slider; 21. second limiting structure; 3. umbrella membrane; 4. middle developing ring; 5. core shaft; 51. first limiting structure; 6. fixing ring; 7. proximal developing ring; 8. umbrella frame; 81. Y-shaped frame; 811. top branch; 812. bottom trunk. DETAILED DESCRIPTION

[0028] 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0029] The purpose of the utility model is to provide a distal protector to solve the problems existing in the prior art. By sliding the slider on the core shaft, the size of the volume inside the umbrella membrane can be changed, so that the umbrella membrane can be adjusted to an appropriate volume size according to the vascular anatomical structure and lesion characteristics of different patients, thereby improving the safety and effectiveness of the operation.

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0031] like Figures 1 to 7 As shown, the present invention provides a distal protector, comprising a core shaft 5, an umbrella frame 8, and an umbrella membrane 3. The umbrella frame 8 and the umbrella membrane 3 are combined to form an umbrella-like filter. Unlike ordinary umbrellas, the umbrella frame 8 is not provided at other positions inside the umbrella membrane 3 except at its open end. This makes it easy to adjust the length of the umbrella membrane 3 in the axial direction to change the axial length and volume of the umbrella membrane 3. A first limiting structure 51 is distributed axially on the core shaft 5. The first limiting structure 51 can be in any form such as a protrusion, a groove, a barb, a ratchet, etc., with the purpose of matching with the second limiting structure 21 provided on the slider 2, thereby limiting the position of the slider 2 on the core shaft 5. The closed end of the umbrella frame 8 is fixedly connected to the proximal end of the core shaft 5, that is, the closed end does not move relative to the core shaft 5. The flared end of the umbrella frame 8 faces the distal end of the core shaft 5, which facilitates the release and recovery of the umbrella frame 8 when implanted. The umbrella membrane 3 has filter holes for blood circulation. The size and number of the filter holes are common knowledge in the art. The filter holes can be distributed as evenly as possible. No or few filter holes can be set at the distal end of the umbrella membrane 3. The open end of the umbrella membrane 3 covers the flared end connected to the umbrella frame 8, so that the open end faces the proximal end of the core shaft 5, which facilitates the use of the umbrella membrane 3 to filter and collect thrombi or debris. The closed end of the umbrella membrane 3 is connected to the slider 2, which can drive the closed end of the umbrella membrane 3 to slide toward the inside of the umbrella membrane 3, thereby changing the axial length of the umbrella membrane 3 and the internal volume of the umbrella membrane 3. The slider 2 is provided with a second limiting structure 21 that cooperates with the first limiting structure 51. The second limiting structure 21 can be in any form such as a protrusion, a groove, a barb, a ratchet, etc.

[0032] The open end of the umbrella membrane 3 of the present invention covers the flared end connected to the umbrella frame 8, and the umbrella frame 8 is not provided on the side of the umbrella membrane 3 away from the open end. Therefore, the axial position of the umbrella membrane 3 on the core shaft 5 can be changed by sliding the slider 2 on the core shaft 5, thereby changing the size of the internal volume of the umbrella membrane 3, so that the umbrella membrane 3 with appropriate axial length and volume can be adjusted according to the vascular anatomical structure and pathological characteristics of different patients, and the position is fixed by the cooperation of the first limiting structure 51 and the second limiting structure 21, thereby ultimately improving the safety and effectiveness of the operation.

[0033] The adjustable volume of the umbrella 3 allows the distal protector to adapt to the needs of different blood vessel diameters, providing greater flexibility and adaptability for surgery and ensuring effective protection under various vascular conditions. The adjustable volume of the umbrella 3 helps optimize the fit of the distal protector to the vessel wall, reducing damage to the vessel wall during release and retrieval, and lowering the risk of vascular complications. By precisely controlling the volume of the umbrella 3, doctors can more accurately position and operate, thereby improving the success rate and safety of the surgery. By adjusting the volume of the umbrella 3, the ability to capture intravascular debris can be optimized, reducing the risk of debris dislodgment during interventional procedures, and thus reducing the incidence of complications.

[0034] The slider 2 can be in a circular, rectangular, triangular, or other shape and can be integrally mounted on the core shaft 5, i.e., the slider 2 has a central through-hole, or the slider 2 can be divided into multiple sections and distributed circumferentially on the outer diameter side of the core shaft 5. In this case, a track extending along the axial direction for relative sliding between the slider 2 and the core shaft 5 is provided. Of course, the slider 2 can also adopt other methods that can achieve a sliding connection with the core shaft 5. In one embodiment, the slider 2 is an annular block, and the outer diameter side or axial side of the annular block is fixedly connected to the umbrella membrane 3 by bonding, welding, or crimping.

[0035] In one embodiment, the interior of the core shaft 5 is a hollow structure, which facilitates the passage of a guide wire. The guide wire can be used to deliver the distal protector to a designated vascular lesion location.

[0036] In one embodiment, the first limiting structure 51 is a radial protrusion provided on the core shaft 5. The radial protrusion can be fixedly provided or connected to an elastic component. The second limiting structure 21 is a groove provided on the inner diameter side of the annular block. The size of the groove is adapted to the radial protrusion. After the radial protrusion enters the groove, it can at least provide resistance to the continued axial movement of the annular block or directly limit the axial movement of the annular block (the restriction is released after the radial protrusion is retracted inward), so as to maintain the shape and state of the umbrella membrane 3 in accordance with the requirements. Alternatively, the first limiting structure 51 is a groove provided on the core shaft 5, and the second limiting structure 21 is a radial protrusion provided on the inner diameter side of the annular block. For the setting method of the radial protrusion and the groove, refer to the above content, that is, the radial protrusion can be fixedly provided or connected to an elastic component, and the size of the groove is adapted to the radial protrusion.

[0037] In one embodiment, the annular block is made of a developing material, thereby having a developing function, so as to enable positioning during interventional treatment.

[0038] In one embodiment, it also includes a proximal developing ring 7, a middle developing ring 4 and a distal developing ring 1. The proximal developing ring 7 is arranged at the proximal end of the core shaft 5. The middle developing ring 4 is arranged at the flared end of the umbrella frame 8. The middle developing ring 4 (whose axial direction is parallel to the axial direction of the core shaft 5 and its diameter is smaller than the diameter of the core shaft 5) can be sleeved on the fork of the flared end. When the umbrella frame 8 shrinks, they do not interfere with each other. When the umbrella frame 8 has multiple forks, there are multiple middle developing rings 4 distributed circumferentially. The distal developing ring 1 is arranged at the distal end of the core shaft 5. The proximal developing ring 7, the middle developing ring 4 and the distal developing ring 1 can perform imaging and identification on each position of the distal protector and perform positioning during interventional treatment.

[0039] In one embodiment, the umbrella frame 8 comprises a circumferentially distributed, elastic Y-shaped frame 81. When unconstrained, the Y-shaped frame 81 naturally expands, forming an umbrella frame 8 with a flared end. After treatment, the Y-shaped frame 81 can be restrained by a delivery catheter, then retracted and retracted. Adjacent Y-shaped frames 81 are connected by their top branches 811. The bottom trunk 812 of the Y-shaped frame 81 is connected to the core shaft 5. Adjacent Y-shaped frames 81 form a diamond-shaped structure, facilitating expansion and retraction.

[0040] In one embodiment, when the umbrella frame 8 is in the open state, the bottom trunk 812 is Z-shaped, the upper arm and the lower arm of the Z-shape are parallel to the core shaft 5, and multiple Z-shaped structures are formed by surrounding each other circumferentially to form a trumpet-shaped structure, the upper arm is connected to the top branch 811, and the lower arm is connected to the core shaft 5.

[0041] In one embodiment, a fixing ring 6 is further included, which is sleeved on the core shaft 5. The lower arm is located in the gap between the fixing ring 6 and the core shaft 5. An interference fit can be used to enable the fixing ring 6 to more firmly fix the lower arm on the core shaft 5.

[0042] In one embodiment, the open end of the umbrella membrane 3 covers the top branch 811 connected to the Y-shaped frame 81, and the axial length of the top branch 811 is smaller than the axial length of the umbrella membrane 3, that is, the umbrella frame 8 is not provided in most areas of the umbrella membrane 3, which facilitates the adjustment of the length of the umbrella membrane 3. At the same time, it also facilitates the adjustment of the shape of the umbrella membrane 3 so that it can better adapt to the shape of the blood vessel.

[0043] In one embodiment, the umbrella membrane 3 has a straight extension section or a gently sloping extension section from the open end to the closed end, and the closed end is closed with an arc surface. The overall structure is similar to a cylindrical structure, which can increase the internal volume of the umbrella membrane 3 and increase the storage capacity for thrombus or debris. At the same time, it increases the adjustment range. After the axial length of the umbrella membrane 3 is adjusted, the umbrella membrane 3 can completely cover the target area, reducing or preventing thrombus or debris from entering the distal blood vessels.

[0044] In one embodiment, the distal protector can collect thrombi and detached atherosclerotic plaque fragments. Before thrombus treatment, the distal protector and the delivery catheter are passed through the guide wire to the distal end of the vascular lesion site, the guide wire is kept stationary, and the delivery catheter is withdrawn to open the umbrella membrane 3; during interventional angioplasty and stent surgery, the detached thrombi are ensured to be intercepted without affecting the blood supply to downstream tissues. When the operation is completed, the surgical-related instruments are first withdrawn, and then the retrieval catheter is inserted, and the umbrella membrane 3 and the thrombus are withdrawn from the body through the retrieval catheter.

[0045] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A remote protector, characterized in that: include: A core shaft, wherein a first limiting structure is distributed along the axial direction of the core shaft; An umbrella frame, wherein the closed end of the umbrella frame is fixedly connected to the proximal end of the core shaft, and the flared end of the umbrella frame faces the distal end of the core shaft; And an umbrella membrane, the umbrella membrane has filtering holes for blood circulation, the open end of the umbrella membrane covers and connects to the flared end, the open end faces the proximal end of the core shaft, the closed end of the umbrella membrane is connected to a slider, and the slider is provided with a second limiting structure that cooperates with the first limiting structure.

2. The remote protector according to claim 1, characterized in that: The sliding block is an annular block.

3. The remote protector according to claim 2, characterized in that: The first limiting structure is a radial protrusion arranged on the core shaft, and the second limiting structure is a groove arranged on the inner diameter side of the annular block; or, the first limiting structure is a groove arranged on the core shaft, and the second limiting structure is a radial protrusion arranged on the inner diameter side of the annular block.

4. The remote protector according to claim 2, characterized in that: The annular block is made of developing material.

5. The remote protector according to claim 1, characterized in that: It also includes a proximal developing ring, a middle developing ring and a distal developing ring. The proximal developing ring is arranged at the proximal end of the core shaft, the middle developing ring is arranged at the flared end of the umbrella frame, and the distal developing ring is arranged at the distal end of the core shaft.

6. The remote protector according to claim 1, characterized in that: The umbrella frame includes elastic Y-shaped frames distributed along the circumference, adjacent Y-shaped frames are connected through top branches thereof, and the bottom trunks of the Y-shaped frames are connected to the core shaft.

7. The remote protector according to claim 6, characterized in that: When the umbrella frame is in an open state, the bottom trunk is in a Z shape, the upper arm and the lower arm of the Z shape are parallel to the core shaft, and the lower arm is connected to the core shaft.

8. The remote protector according to claim 7, characterized in that: It also includes a fixing ring, which is sleeved on the core shaft, and the lower support arm is located in the gap between the fixing ring and the core shaft.

9. The remote protector according to claim 6, characterized in that: The open end covers and connects to the top branch, and the axial length of the top branch is smaller than the axial length of the umbrella membrane.

10. The remote protector according to claim 1, characterized in that: The umbrella film adopts a straight extension section or a gently sloping extension section from the open end to the closed end, and the closed end adopts an arc-shaped surface closing.

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