An intracranial double protection umbrella device

Abstract

The present invention provides an intracranial double protective umbrella device, which relates to the technical field of medical devices and includes an outer catheter; an outer protective umbrella, which is pressed and gripped inside the outer catheter; an inner catheter, which is arranged inside the outer catheter and is slidably connected to the outer protective umbrella; the inner protective umbrella, which is pressed and gripped inside the inner catheter; an inner guidewire, which is connected to the inner protective umbrella; a limit block is provided on the inner catheter at the proximal end of the outer protective umbrella, and a limit ring is provided at the distal end of the inner catheter, wherein the limit ring and the limit block limit the sliding range of the outer protective umbrella on the inner catheter; a blocking ring is provided inside the inner catheter at the proximal end of the outer protective umbrella, and the inner guidewire passes through the blocking ring and can slide relative to the blocking ring. The present invention allows the outer protective umbrella to be pressed and gripped inside the outer catheter and the inner protective umbrella to be pressed and gripped inside the inner catheter, so that the two protective umbrellas are independently arranged and can be released at once to protect bifurcated blood vessels.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and in particular relates to an intracranial double protection umbrella device. Background Art

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

[0003] For intracranial protective umbrella devices, intracranial thrombosis often occurs in Figure 1 In the basilar artery area shown, due to the large number of intracranial blood vessels bifurcating and being circuitous, the requirements for the delivery and release of protective umbrellas are high. For the protection of intracranial arteries at existing bifurcations, two protective umbrellas are generally released in sequence, such as Figure 2 As shown in the figure, the parachute is retrieved, so it comes with a built-in parachute guidewire. Generally, the parachute is released in an antegrade manner for the first time, and in a retrograde manner through the posterior communicating artery for the second time. This method is relatively cumbersome.

[0004] Therefore, it is necessary to provide an improved technical solution to the above-mentioned deficiencies in the prior art. Summary of the Invention

[0005] The purpose of the present invention is to provide an intracranial double protective umbrella device to solve the problem that two protective umbrellas need to be released at the communicating artery, and the operation of releasing the protective umbrellas twice is relatively cumbersome.

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

[0007] An intracranial double-protection umbrella device includes an outer catheter;

[0008] An outer protective umbrella is pressed and gripped inside the outer catheter;

[0009] An inner layer conduit is arranged inside the outer layer conduit and is slidably connected to the outer layer protective umbrella;

[0010] An inner protective umbrella is pressed and gripped inside the inner tube;

[0011] An inner layer guide wire connected to the inner layer protective umbrella;

[0012] The inner tube is provided with a limit block located at the proximal end of the outer protective umbrella, and the distal end of the inner tube is provided with a limit ring, and the limit ring and the limit block limit the sliding range of the outer protective umbrella on the inner tube;

[0013] A blocking ring located at the proximal end of the outer protective umbrella is provided inside the inner layer catheter, and the inner layer guide wire passes through the blocking ring and can slide relative to the blocking ring.

[0014] Preferably, the outer protective umbrella and the inner protective umbrella are arranged opposite to each other, the diameter of the outer protective umbrella gradually increases from the proximal end to the distal end, and the diameter of the inner protective umbrella gradually decreases from the proximal end to the distal end.

[0015] Preferably, the blocking ring is a circular ring made of stainless steel, a through hole is provided in the middle of the blocking ring, and the through hole of the blocking ring is slidably connected to the inner layer guide wire.

[0016] Preferably, the through hole is arranged along the axial direction of the sealing ring, and the diameter of the through hole gradually shortens from the distal end to the proximal end.

[0017] Preferably, a retrieval guide wire is provided at the proximal end of the inner protective umbrella, and one end of the retrieval guide wire facing away from the inner protective umbrella is fixedly connected to the inner guide wire.

[0018] Preferably, there are 4-8 retrieval guidewires, and the retrieval guidewires are distributed at equal intervals in the radial direction.

[0019] Preferably, a shaping portion is provided at the distal end of the inner guide wire, and the shaping portion is hook-shaped.

[0020] Preferably, the distance between the distal end of the inner protective umbrella and the shaping portion is 20-30 mm.

[0021] Preferably, a quick junction is provided at the distal end of the outer catheter, and a guide wire is passed through the quick junction of the outer catheter.

[0022] Preferably, the limiting ring is formed by densely winding platinum-iridium alloy wire, and at least in the radial direction, the limiting ring protrudes from the outer layer of the conduit.

[0023] Beneficial effects:

[0024] (1) The present invention presses the outer protective umbrella into the outer catheter and the inner protective umbrella into the inner catheter, allowing the two protective umbrellas to be set independently and releasing both protective umbrellas at once to protect the bifurcated blood vessels. Since both bifurcations are covered by protective umbrellas, emboli escaping from the basilar artery will be fully captured, preventing the emboli from entering the terminal blood vessels and causing secondary blockage. This solves the problem in the prior art that after one protective umbrella is set in the forward direction, the second protective umbrella cannot be installed in the forward direction due to the presence of the guide wire and must be set in the reverse direction.

[0025] (2) The present invention sets two opposing protective umbrellas. After the device enters the blood vessel from the posterior communicating artery, it advances toward the other bifurcation and places the inner protective umbrella at the other bifurcation, so that both protective umbrellas can be set in the direction of blood flow.

[0026] (3) The present invention provides a shaping portion at the distal end of the inner guide wire. The shaping portion is hook-shaped and is used to reduce the sharp surface of the distal end of the inner guide wire, making it easier to enter the adjacent blood vessels, reducing the possibility of puncturing the blood vessels, and facilitating the doctor's operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings and the accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. Among them:

[0028] Figure 1 A schematic diagram showing the structure of a thrombus in the basilar artery;

[0029] Figure 2 A schematic diagram illustrating the structure of releasing a protective umbrella at a bifurcation in the prior art;

[0030] Figure 3 This is a cross-sectional view showing the overall structure of the intracranial double protection umbrella device in an embodiment of the present invention;

[0031] Figure 4 for Figure 3 A cross-sectional view along the radial direction of the sealing ring;

[0032] Figure 5 for Figure 3 Schematic diagram of the structure of the middle sealing ring, the limit block and the inner layer catheter;

[0033] Figure 6 This is a schematic cross-sectional view of the inner layer conduit and its connection structure in an embodiment of the present invention;

[0034] Figure 7 This is a schematic diagram of the structure of the intracranial double protection umbrella device installed in a blood vessel in an embodiment of the present invention;

[0035] Figure 8 This is a schematic diagram of the connection structure of the inner guide wire and the inner protective umbrella in Example 1 of the present invention;

[0036] Figure 9 Schematic diagram of the connection structure of the inner guide wire and the inner protective umbrella in the second embodiment of the present invention.

[0037] In the figure: 1. Outer catheter; 11. Quick junction; 12. Advance guide wire; 2. Outer protective umbrella; 3. Inner catheter; 31. Blocking ring; 311. Through hole; 32. Limiting ring; 33. Limiting block; 4. Inner protective umbrella; 41. Retrieval guide wire; 5. Inner guide wire; 51. Shaping part. DETAILED DESCRIPTION

[0038] 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 are within the scope of protection of the present invention.

[0039] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They 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. Therefore, they cannot be understood as limitations on the present invention.

[0040] In the description of the present invention, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly indicate the quantity of the technical features indicated. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more features.

[0042] In the description of the present invention, it should be noted that, unless otherwise clearly specified 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 communication between two elements, indirect communication, or an interactive relationship between two elements.

[0043] In the description of the present invention, "before use" refers to the state in which the intracranial double-protection umbrella device has not been used, has not entered the human body, or has not come into contact with body fluids such as blood, tissue fluid, etc. in the human body; and "during use" refers to the state in which the intracranial double-protection umbrella device has entered the human body or has come into contact with body fluids such as blood, tissue fluid, etc. in the human body.

[0044] In the description of the present invention, the "gathered state" refers to a state in which the "branch conduits" are attached to each other within a partial length range or the entire length range.

[0045] In the description of the present invention, the "in vivo environment" refers to the environment below the epidermis of the skin where body fluids exist, such as the dermis and subcutaneous tissue, or the inside of blood vessels and organs.

[0046] In the description of the present invention, "proximal end" refers to the end close to the doctor during surgery, and "distal end" refers to the end farthest from the doctor during surgery.

[0047] The present invention will be described in detail below with reference to the embodiments. It should be noted that the embodiments and features of the embodiments of the present invention can be combined with each other without conflict.

[0048] The present invention addresses the problem in the prior art that the antegrade catheter cannot reach the designated area due to the presence of the guidewire previously used to release the protective umbrella guidewire.

[0049] The present invention provides a double intracranial protective umbrella device, referring to Figure 3 、 Figure 4 and Figure 5 The device comprises an outer catheter 1 having a cavity along its length. The outer catheter 1 is made of polytetrafluoroethylene (PTFE), which has an extremely low coefficient of friction. This allows the catheter to be smoothly advanced through tortuous intracranial vessels, minimizing frictional damage to the vessel walls and reducing the risk of complications such as vasospasm. In other embodiments of the present invention, the outer catheter 1 may be made of polyurethane (PU).

[0050] The outer protective umbrella 2 is compressed and gripped within the outer catheter 1. Made of a shape-memory alloy wire, the outer protective umbrella 2 exhibits shape memory. Initially, the outer protective umbrella 2 is compressed and gripped within the outer catheter 1, restraining the outer protective umbrella 2 at least radially. To release the outer protective umbrella, the outer catheter 1 is pulled proximally, releasing the restraint on the outer protective umbrella 2. The outer protective umbrella 2 then expands, forming an umbrella-like structure with a smaller proximal diameter and a larger distal diameter, thus reaching the released state. The released outer protective umbrella 2 is used to capture passing emboli. In one embodiment, the outer protective umbrella 2 is braided from nickel-titanium alloy wire, which exhibits excellent biocompatibility and chemical stability, minimizing impact on the internal environment.

[0051] refer to Figure 3 、 Figure 4 、 Figure 5 and Figure 6 The inner catheter 3 is arranged inside the outer catheter 1 and is slidably connected to the outer protective umbrella 2. The inner catheter 3 is also a component made of polytetrafluoroethylene (PTFE); the inner catheter 3 slides back and forth in the inner cavity of the outer catheter 1, and the inner catheter 3 is also provided with an inner cavity along its own length direction.

[0052] An inner protective umbrella 4 is pressed and gripped within the inner catheter 3. Made of a memory alloy wire, it is initially pressed and gripped against the inner catheter 3. Pulling the inner catheter 3 proximally releases the inner umbrella 4. Upon reaching the released state, the diameter of the inner umbrella 4 gradually increases from distal to proximal, forming an umbrella-like shape designed to capture emboli. By providing the outer and inner umbrellas 2 and 4, they conform to the inner vessel wall during use, protecting both distal ends of the intracranial arteries at the bifurcation, intercepting and capturing emboli.

[0053] refer to Figure 5 、 Figure 6 and Figure 7 , the inner guide wire 5 is connected to the inner protective umbrella 4; the inner protective umbrella 4 is fixed to the inner guide wire 5 by welding, bonding or hot-melt connection. When pushing and pulling the inner guide wire 5, the inner protective umbrella 4 at the distal end can be driven to move. The inner guide wire 5 is preferably made of stainless steel, so that the inner guide wire 5 has a certain strength, and can pass smoothly through the tortuous and narrow intracranial blood vessels without being easily deformed or broken. At the same time, the inner guide wire 5 has a certain stability to reduce the impact on the internal environment. The proximal end of the inner guide wire 5 is welded with a nickel-titanium alloy wire, and the proximal end of the nickel-titanium alloy wire is welded to the side wall of the inner guide wire 5.

[0054] refer to Figures 3 to 7 The inner tube 3 is provided with a limit block 33 located at the proximal end of the outer protective umbrella 2, and a limit ring 32 is provided at the distal end of the inner tube 3. The limit ring 32 and the limit block 33 limit the sliding range of the outer protective umbrella 2 on the inner tube 3; the limit block 33 is a circular ring welded on the side wall of the inner tube 3, and the limit block 33 is preferably made of stainless steel. At least in the radial direction, the limit block 33 protrudes from the inner tube 3. The purpose of setting the limit block 33 is to prevent the outer protective umbrella 2 from excessively moving along the proximal end of the inner guide wire 5, so as to avoid the outer protective umbrella 2 from moving with it and being unable to be released when the outer tube 1 is pulled proximally.

[0055] Preferably, the retaining ring 32 is made of tightly wound platinum-iridium alloy wire and is secured to the distal end of the inner catheter 3 by bonding, heat-melting, or welding. Under imaging equipment, the retaining ring 32 creates a distinct light spot from other parts of the inner catheter 3, assisting the physician in determining the position of the inner catheter 3. Furthermore, the retaining ring 32 protrudes at least radially from the sidewall of the inner catheter 3. It is understood that during the retraction of the inner catheter 3, the sidewall of the retaining ring 32 will abut the proximal end of the outer protective umbrella 2. Continued retraction will cause the retaining ring 32 to retract the outer protective umbrella 2 into the outer catheter 1.

[0056] The interior of the inner layer catheter 3 is provided with a blocking ring 31 located at the proximal end of the outer layer protective umbrella 2. The inner layer guide wire 5 passes through the blocking ring 31 and can slide relative to the blocking ring 31. The blocking ring 31 is welded or hot-melt connected to the inner wall of the inner layer catheter 3, and an opening is provided in the middle for the inner layer guide wire 5 to slide. In a preferred embodiment, the positions of the blocking ring 31 and the limit block 33 are aligned in the radial direction of the inner layer catheter 3. The blocking ring 31 is located inside the inner layer catheter 3, and the limit block 33 is located outside the inner layer catheter 3, and the two do not conflict with each other. The blocking ring 31 itself is a disc, which is used to prevent emboli from escaping from the inner layer catheter 3. In the embodiment of the present application, the blocking ring 31 is a solid disc, which can improve the blocking ability of emboli. A through hole 311 is provided in the middle of the blocking ring 31. The through hole 311 is arranged along the axial direction of the blocking ring 31. The diameter of the through hole 311 gradually shortens from the distal end to the proximal end, so that the through hole 311 is formed into a cone. During assembly, the inner guidewire 5 with the inner protective umbrella 4 is inserted along the distal end of the inner catheter 3. When passing through the blocking ring 31, it is guided by the sidewalls of the through hole 311 and gradually moves toward the middle of the through hole 311 and passes through the through hole 311. The sidewalls of the through hole 311 serve to guide the inner guidewire 5, reducing the difficulty of assembly.

[0057] refer to Figures 1 to 8 The release process of the device is as follows: the device enters the blood vessel from the posterior communicating artery and advances to the other bifurcation of the blood vessel. After the device is in place, the outer protective umbrella 2 is gripped inside the outer catheter 1, and the outer catheter 1 is withdrawn proximally. The outer protective umbrella 2 automatically swells and abuts against the inner wall of the blood vessel to achieve fixation. Then the inner catheter 3 is withdrawn, and the inner protective umbrella 4 is allowed to swell automatically and abut against the inner wall of the blood vessel to achieve fixation. When the inner catheter 3 is withdrawn, the position of the limit ring 32 is judged by the developing equipment to avoid excessive withdrawal, which causes the limit ring 32 to drive the outer protective umbrella 2 to shift. By adopting a double-layer catheter design, two protective umbrellas can be released at one time to protect the bifurcated blood vessels. Since the bifurcations on both sides are covered by protective umbrellas, the emboli escaping from the basilar artery will be fully captured to prevent the emboli from entering the terminal blood vessels and causing secondary blockage.

[0058] During recovery, the inner guide wire 5 is pulled back, and the inner guide wire 5 drives the inner protective umbrella 4 to withdraw. The nickel-titanium alloy wire is first released from the inner catheter 3, pulling the inner protective umbrella 4 to contract radially, and the inner protective umbrella 4 is received into the distal end of the inner catheter 3. Then, the inner catheter 3 is withdrawn, and the limiting ring 32 on the inner catheter 3 drives the outer protective umbrella 2 to withdraw, and the outer protective umbrella 2 is received into the outer catheter 1, thereby conveniently completing the recovery of the outer protective umbrella 2 and the inner protective umbrella 4.

[0059] The inner catheter 3 acts as a guidewire connecting to the outer protective umbrella 2. The inner guidewire 5 and inner catheter 3 can slide relative to each other, allowing the inner protective umbrella 4 and outer protective umbrella 2 to be independently installed and released independently, minimizing the impact on each other. This solves the problem of prior art where, after one protective umbrella is installed in the forward direction, a second umbrella must be installed in the reverse direction. Furthermore, two protective umbrellas can be released simultaneously to protect bifurcated vessels.

[0060] In a preferred embodiment of the present invention, the diameter of the outer protective umbrella 2 gradually increases from the proximal end to the distal end, while the diameter of the inner protective umbrella 4 gradually decreases from the proximal end to the distal end. By positioning the two protective umbrellas in opposing directions (opposite means that the larger opening of the outer protective umbrella 2 is close to the larger opening of the inner protective umbrella 4), the device enters the blood vessel through the posterior communicating artery and then advances to the other bifurcation, where the inner protective umbrella 4 is positioned, ensuring that both protective umbrellas are positioned in the direction of blood flow.

[0061] In a preferred embodiment of the present invention, the occluding ring 31 is a circular ring made of stainless steel. A through-hole 311 is provided in the center of the occluding ring 31. This through-hole 311 is slidably connected to the inner guidewire 5. The proximal diameter of the through-hole 311 is larger than the diameter of the inner guidewire 5 by at least 0.1 mm. This design is intended to obstruct blood flow through the inner catheter 3 and reduce bleeding.

[0062] In a preferred embodiment of the present invention, through-hole 311 is arranged axially along the sealing ring 31, and the diameter of through-hole 311 gradually decreases from the distal end to the proximal end. The sidewall of the sealing ring 31 located at through-hole 311 is inclined, which contacts the inner guidewire 5 during assembly and guides it toward the center, thus simplifying assembly.

[0063] In a preferred embodiment of the present invention, a retrieval guidewire 41 is provided at the proximal end of the inner protective umbrella 4, and the end of the retrieval guidewire 41 facing away from the inner protective umbrella 4 is fixedly connected to the inner guidewire 5. The retrieval guidewire 41 is made of nickel-titanium alloy and has a certain ductility, and can expand or contract with the inner protective umbrella 4. The proximal end of the retrieval guidewire 41 is welded, bonded or hot-melted to the inner guidewire 5, and the distal end is welded, bonded or hot-melted to the outer edge of the proximal end of the inner protective umbrella 4. The function of the retrieval guidewire 41 is to first contact the inner catheter 3 and drive the proximal end of the inner protective umbrella 4 to contract, so as to solve the problem that the proximal end diameter of the inner protective umbrella 4 is larger than the diameter of the inner catheter 3, resulting in difficulty in retrieval.

[0064] In a more preferred embodiment of the present invention, there are 4-8 recovery guide wires 41, and the recovery guide wires 41 are evenly distributed along the radial direction. On the one hand, the connection between the inner protective umbrella 4 and the inner guide wire 5 can be made more stable. On the other hand, it is convenient for the proximal end of the inner protective umbrella 4 to be fully retracted during recovery, thereby facilitating recovery.

[0065] In a preferred embodiment of the present invention, the distal end of the inner guidewire 5 is provided with a hook-shaped shaping portion 51. The shaping process involves inserting the distal end of the inner guidewire 5 into the hook-shaped slot of the shaper. The guidewire is then bent along the shape of the slot, gradually conforming to the groove. The shaping portion 51 serves to reduce the sharpness of the distal end of the inner guidewire 5, facilitating access to adjacent blood vessels, reducing the possibility of puncture and injury, and facilitating the doctor's operation.

[0066] In a preferred embodiment of the present invention, the distance between the distal end of the inner protective umbrella 4 and the shaping portion 51 is 20-30 mm. Specifically, the distance can be one of (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30) mm. The longer distance between the shaping portion 51 and the distal end of the inner protective umbrella 4 allows the shaping portion to have greater freedom of movement, reducing the possibility of snagging at vascular bifurcations.

[0067] In a preferred embodiment of the present invention, the retaining ring 32 is formed of densely wound platinum-iridium alloy wire. At least radially, the retaining ring 32 protrudes from the outer catheter 1. Platinum-iridium alloy has excellent chemical stability, allowing it to maintain stable operation in the complex environment of the human body, reducing irritation and adverse reactions to human tissue.

[0068] In a preferred embodiment of the present invention, the outer catheter 1 is provided with a quick-release port 11 at its distal end, through which a guidewire 12 is passed. This quick-release port 11 allows the guidewire 12 to be inserted through the quick-release port 11 during the release phase and into the posterior communicating artery, where it then guides the outer catheter 1 to the release position. This quick-release port 11 and the insertion of the guidewire 12 to guide the outer catheter 1 simplifies positioning the outer catheter 1.

[0069] The following describes in detail an intracranial double protection umbrella device of the present invention through specific embodiments.

[0070] Example 1

[0071] This embodiment provides an intracranial double protection umbrella device, referring to Figure 3 、 Figure 4 and Figure 5 , including an outer catheter 1, which is provided with a cavity along its length, and is a component made of polytetrafluoroethylene (PTFE). A quick junction 11 is provided at the distal end of the outer catheter 1, and a guide wire 12 is passed through the quick junction 11 of the outer catheter 1. The guide wire 12 is a wire with a diameter of 0.25-0.45 mm. Preferably, the guide wire 12 is 0.25 mm. During the operation, after opening the posterior communicating artery, the outer catheter 1 enters the blood vessel, and then the guide wire 12 is inserted from the quick junction 11. The guide wire 12 is used to guide the outer catheter 1, so that the outer catheter 1 can be put into place.

[0072] An inner tube 3 is disposed within the cavity of the outer tube 1. An outer protective umbrella 2 is slidably connected to the sidewall of the inner tube 3 and is pressed and gripped within the outer tube 1. The outer protective umbrella 2 is umbrella-shaped, with a larger distal opening diameter and a smaller proximal opening diameter. The outer protective umbrella 2 is woven from memory alloy wire, preferably nickel-titanium alloy wire. The inner tube 3 is a PTFE component and has an inner cavity along its length. An inner protective umbrella 4 is pressed and gripped within the inner cavity of the inner tube 3. The inner protective umbrella 4 is also made of memory alloy wire. A recovery guidewire 41 is welded, bonded, or hot-melt-connected to the proximal end of the inner protective umbrella 4. The inner guidewire 5 is welded to the middle portion of the inner protective umbrella 5. The end of the recovery guidewire 41 facing away from the inner protective umbrella 4 is welded, bonded, or hot-melt-connected to the inner guidewire 5.

[0073] refer to Figure 3 、 Figure 6 、 Figure 7 and Figure 8 In a preferred embodiment of the present application, there are 4-8 recovery guidewires 41. In a specific embodiment, there are 4 recovery guidewires 41, and the 4 recovery guidewires 41 are distributed in a circular shape with equal intervals in the radial direction. During recovery, the recovery guidewire 41 first enters the inner layer catheter 3, driving the proximal end of the inner layer protective umbrella 4 to contract. The 4 evenly distributed recovery guidewires 41 can make the inner layer protective umbrella 4 contract evenly, reducing the difficulty of recovering the inner layer protective umbrella 4.

[0074] A stopper 33 is welded to the outer catheter 1, located proximal to the outer protective umbrella 2. A stopper ring 32 is welded to the distal end of the inner catheter 3. The stopper ring 32 restricts the movement of the outer protective umbrella 2 distally, while the stopper 33 restricts its movement proximally, forcing the outer protective umbrella 2 to slide only along the sidewall of the inner catheter 3, between the stopper ring 32 and the stopper 33. At least radially, the stopper 33 and the stopper ring 32 protrude from the sidewall of the outer catheter 1. The stopper 33 prevents excessive movement of the outer protective umbrella 2 along the proximal end of the inner guidewire 5, thus preventing the outer protective umbrella 2 from continuously moving with it and becoming unreleased when the outer catheter 1 is pulled proximally. The stopper ring 32 is made of tightly wound platinum-iridium alloy wire and is secured to the distal end of the inner catheter 3 by bonding, hot-melt bonding, or welding. Under imaging equipment, the stopper ring 32 creates a bright spot with a different brightness from other parts of the inner catheter 3, assisting the physician in determining the position of the inner catheter 3.

[0075] The inner catheter 3 is internally welded, hot-melted, or bonded with a blocking ring 31, located proximal to the outer protective umbrella 2. The inner guidewire 5 passes through the blocking ring 31 and can slide relative to it. The blocking ring is a solid disc that enhances the ability to block emboli and reduces the possibility of blood flowing out of the inner catheter 3.

[0076] In this embodiment, a through hole 311 is provided in the middle of the sealing ring 31. The through hole 311 is arranged along the axial direction of the sealing ring 31. The diameter of the through hole 311 gradually shortens from the distal end to the proximal end, so that the through hole 311 is formed into a cone. During assembly, the side wall of the through hole 311 is used to guide the inner guide wire 5, reducing the difficulty of assembly.

[0077] Example 2

[0078] This embodiment further describes the inner guide wire 5 based on the embodiment 1.

[0079] refer to Figure 9 The distal end of the inner guidewire 5 is shaped and provided with a shaping portion 51. This shaping portion 51 is designed to bend the inner guidewire 5 along the shape of the hook-shaped slot, with the distal end configured to deflect toward one side. This shaping portion 51 reduces the sharpness of the distal end of the inner guidewire 5, facilitating entry into adjacent blood vessels and minimizing the risk of puncture. The distance between the distal end of the inner protective umbrella 4 and the shaping portion 51 is 20 mm.

[0080] In another embodiment of the present application, the plastic portion 51 is a circular ring or an elliptical ring.

[0081] In summary: The present invention is provided with two layers of catheters and protective umbrellas on both sides. When in use, the device enters the blood vessel from the posterior communicating artery and advances toward the other bifurcation of the blood vessel. After the device is in place, the outer catheter 1 is withdrawn proximally, and the outer protective umbrella 2 automatically expands and contacts the inner wall of the blood vessel. Thereafter, the inner catheter 3 is withdrawn, and the inner protective umbrella 4 is allowed to automatically expand and contact the inner wall of the blood vessel. At this time, both protective umbrellas are released to cover the bifurcations on both sides, preventing emboli from entering the terminal blood vessels and causing secondary blockage. By adopting a double-layer catheter design, two protective umbrellas can be released at once to protect the bifurcated blood vessels.

[0082] During recovery, the inner guidewire 5 is pulled back, which drives the inner protective umbrella 4 back. The nickel-titanium alloy wire is first released from the inner catheter 3, pulling the inner protective umbrella 4 radially to contract. The inner protective umbrella 4 is then retracted to the distal end of the inner catheter 3. The inner catheter 3 is then retracted, and the retaining ring 32 on the inner catheter 3 drives the outer protective umbrella 2 back, which is then retracted into the outer catheter 1, conveniently completing the recovery of the outer protective umbrella 2 and the inner protective umbrella 4. By using two opposing protective umbrellas, both umbrellas are arranged in the direction of blood flow after release.

[0083] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An intracranial double protection umbrella device, characterized in that: comprising an outer catheter (1); An outer protective umbrella (2) is pressed and gripped inside the outer catheter (1); An inner layer conduit (3) is arranged inside the outer layer conduit (1) and is slidably connected to the outer layer protective umbrella (2); An inner protective umbrella (4) is pressed and gripped inside the inner tube (3); An inner layer guide wire (5) connected to the inner layer protective umbrella (4); The inner tube (3) is provided with a limit block (33) located at the proximal end of the outer protective umbrella (2), and the distal end of the inner tube (3) is provided with a limit ring (32), and the limit ring (32) and the limit block (33) limit the sliding range of the outer protective umbrella (2) on the inner tube (3); The inner layer catheter (3) is provided with a blocking ring (31) located at the proximal end of the outer layer protective umbrella (2), and the inner layer guide wire (5) passes through the blocking ring (31) and can slide relative to the blocking ring (31).

2. The intracranial double protection umbrella device according to claim 1, characterized in that: The outer protective umbrella (2) and the inner protective umbrella (4) are arranged relative to each other, the diameter of the outer protective umbrella (2) gradually increases from the proximal end to the distal end, and the diameter of the inner protective umbrella (4) gradually decreases from the proximal end to the distal end.

3. The intracranial double protection umbrella device according to claim 1, characterized in that: The blocking ring (31) is a circular ring made of stainless steel. A through hole (311) is provided in the middle of the blocking ring (31). The through hole (311) of the blocking ring (31) is slidably connected to the inner layer guide wire (5).

4. The intracranial double protection umbrella device according to claim 3, characterized in that: The through hole (311) is arranged along the axial direction of the sealing ring (31), and the diameter of the through hole (311) gradually shortens from the distal end to the proximal end.

5. The intracranial double protection umbrella device according to claim 1, characterized in that: A recovery guide wire (41) is provided at the proximal end of the inner protective umbrella (4), and one end of the recovery guide wire (41) facing away from the inner protective umbrella (4) is fixedly connected to the inner guide wire (5).

6. The intracranial double protection umbrella device according to claim 5, characterized in that: There are 4 to 8 retrieval guide wires (41), and the retrieval guide wires (41) are distributed at equal intervals in the radial direction.

7. The intracranial double protection umbrella device according to claim 1, characterized in that: The distal end of the inner layer guide wire (5) is provided with a shaping portion (51), and the shaping portion (51) is hook-shaped.

8. The intracranial double protection umbrella device according to claim 7, characterized in that: The distance between the distal end of the inner protective umbrella (4) and the shaping portion (51) is 20-30 mm.

9. The intracranial double protection umbrella device according to any one of claims 1 to 8, characterized in that: The distal end of the outer layer catheter (1) is provided with a quick junction (11), and the outer layer catheter (1) is provided with a leading guide wire (12) at the quick junction (11).

10. The intracranial double protection umbrella device according to any one of claims 1 to 8, characterized in that: The limiting ring (32) is formed by densely winding platinum-iridium alloy wire, and at least in the radial direction, the limiting ring (32) protrudes from the outer layer conduit (1).

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