Intracranial double-protection umbrella device

Abstract

The invention provides an intracranial double-protection umbrella device, and relates to the technical field of medical instruments. The outer-layer protective umbrella is pressed and held in the outer-layer guide pipe; the inner-layer guide pipe is arranged in the outer-layer guide pipe and is in sliding connection with the outer-layer protection umbrella; the inner-layer protection umbrella is pressed and held in the inner-layer guide pipe; the inner-layer guide wire is connected with the inner-layer protective umbrella; a limiting block located at the near end of the outer-layer protective umbrella is arranged on the inner-layer catheter, a limiting ring is arranged at the far end of the inner-layer catheter, and the limiting ring and the limiting block limit the sliding range of the outer-layer protective umbrella on the inner-layer catheter; a plugging ring located at the near end of the outer-layer protective umbrella is arranged in the inner-layer catheter, and the inner-layer guide wire penetrates through the plugging ring and can slide relative to the plugging ring. The outer-layer protection umbrella is pressed and held in the outer-layer catheter, the inner-layer protection umbrella is pressed and held in the inner-layer catheter, the two protection umbrellas are independently arranged, and the two protection umbrellas can be released at a time to protect bifurcated blood vessels.

Description

Technical Field

[0001] The 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, 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 After the operation is completed, the device and the emboli it intercepted can be withdrawn from the body together.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] 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 succession, such as Figure 2 As shown. Since the protective umbrella needs to be recovered, it is equipped with a protective umbrella guide wire. Generally, the protective umbrella is released in the first forward direction and the second time through the posterior communicating artery. This operation method is more cumbersome.

[0004] Therefore, it is necessary to provide an improved technical solution to address 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, comprising an outer catheter;

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

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

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

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

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

[0013] A blocking ring located at the proximal end of the outer protective umbrella is arranged 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 blocking ring, and the diameter of the through hole gradually shortens from the distal end to the proximal end.

[0017] Preferably, a recovery guide wire is provided at the proximal end of the inner protective umbrella, and one end of the recovery 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-release port is provided at the distal end of the outer catheter, and a guide wire is passed through the quick-release port 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 and holds the outer protective umbrella in the outer catheter and the inner protective umbrella in the inner catheter, so that the two protective umbrellas are set independently and can be released at one time to protect the bifurcated blood vessels. Since both bifurcations are covered by protective umbrellas, the embolus escaping from the basilar artery will be fully captured to prevent the embolus 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 a 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 moves 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 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:

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

[0029] Figure 2 It is a schematic diagram for showing the structure of releasing the protective umbrella at the bifurcation in the prior art;

[0030] Figure 3 This is a cross-sectional view for 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 plugging ring;

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

[0033] Figure 6 It 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 layer guide wire and the inner layer protective umbrella in the first embodiment of the present invention;

[0036] Fig. 9 This is a 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. recovery 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 belong to 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., 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.

[0040] 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.

[0041] 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, 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 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.

[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 the state in which the "branch conduits" are attached to each other within a partial length range or within the entire length range.

[0045] In the description of the present invention, "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 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.

[0048] The present invention aims to solve the problem in the prior art that the antegrade catheter cannot reach the designated area due to the existence of the guidewire previously released as the protective umbrella guidewire.

[0049] The present invention provides an intracranial double protection umbrella device, referring to Figure 3 , Figure 4 and Figure 5 , including an outer catheter 1; the outer catheter 1 is provided with a cavity along its length. The outer catheter 1 is a component made of polytetrafluoroethylene (PTFE), which has an extremely low friction coefficient, so that the catheter can be smoothly advanced in the tortuous intracranial blood vessels, reducing friction damage to the blood vessel wall and reducing the risk of complications such as vascular spasm. In other embodiments of the present invention, the outer catheter 1 can be made of (PU).

[0050] The outer protective umbrella 2 is pressed and gripped inside the outer catheter 1; the outer protective umbrella 2 is made of memory alloy wire, which has shape memory function. In the initial state, the outer protective umbrella 2 is pressed and gripped inside the outer catheter 1, and the outer catheter 1 limits the outer protective umbrella 2 at least in the radial direction. When it needs to be released, the outer catheter 1 is pulled toward the proximal end to release the limit of the outer protective umbrella 2, and the outer protective umbrella 2 expands by itself to form an umbrella-shaped structure with a small proximal diameter and a large distal diameter, reaching a released state. The outer protective umbrella 2 in the released state is used to capture passing emboli. In one embodiment, the outer protective umbrella 2 is woven from nickel-titanium alloy wire, which has good biocompatibility, strong chemical stability, and little 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] The inner protective umbrella 4 is pressed and gripped inside the inner catheter 3; the inner protective umbrella 4 is made of memory alloy wire. In the initial state, it is pressed and gripped at the inner catheter 3, and the inner catheter 3 is pulled toward the proximal end to gradually release the inner protective umbrella 4. When the release state is reached, the diameter of the inner protective umbrella 4 gradually increases from the distal end to the proximal end, and the inner protective umbrella 4 is umbrella-shaped and is used to capture emboli. By setting the outer protective umbrella 2 and the inner protective umbrella 4, when in use, the outer protective umbrella 2 and the inner protective umbrella 4 are both in contact with the inner wall of the blood vessel, which can protect the distal ends of both sides of the intracranial artery 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 the inner guide wire 5 is pushed and pulled, 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 catheter 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 catheter 3. The limit ring 32 and the limit block 33 limit the sliding range of the outer protective umbrella 2 on the inner catheter 3; the limit block 33 is a circular ring welded on the side wall of the inner catheter 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 catheter 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 the outer catheter 1 and being unable to be released when the outer catheter 1 is pulled toward the proximal end.

[0055] Preferably, the limiting ring 32 is made of platinum-iridium alloy wires that are tightly wound. The limiting ring 32 is fixed to the distal end of the inner catheter 3 by bonding, hot-melt connection or welding. Under the development equipment, the limiting ring 32 forms a light spot different from other parts, thereby assisting the doctor in determining the position of the inner catheter 3. At the same time, the limiting ring 32 protrudes from the side wall of the inner catheter 3 at least in the radial direction. It can be understood that in the process of withdrawing the inner catheter 3, the side wall of the limiting ring 32 will abut against the proximal end of the outer protective umbrella 2, and continued withdrawal will allow the limiting ring 32 to drive the outer protective umbrella 2 to be recovered into the outer catheter 1.

[0056] 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. The blocking ring 31 is welded or hot-melted 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, and the through hole 311 is arranged along the axial direction of the blocking ring 31. The caliber 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 guide wire 5 with the inner protective umbrella 4 is inserted along the distal end of the inner catheter 3, and when passing through the blocking ring 31, it is guided by the side wall of the through hole 311 to gradually move toward the middle of the through hole 311 and pass through the through hole 311. The side wall of the through hole 311 is used to guide the inner guide wire 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 layer catheter 1 is pressed and gripped with the outer layer protective umbrella 2, and the outer layer catheter 1 is withdrawn proximally. The outer layer protective umbrella 2 automatically bulges and abuts against the inner wall of the blood vessel to achieve fixation. Then the inner layer catheter 3 is withdrawn, and the inner layer protective umbrella 4 is allowed to bulge automatically and abut against the inner wall of the blood vessel to achieve fixation. When the inner layer 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 layer protective umbrella 2 to shift. By adopting the design of a double-layer catheter, two protective umbrellas can be released at a time to protect the bifurcated blood vessels. Since the bifurcations on both sides are covered by protective umbrellas, the thrombi escaping from the basilar artery will be fully captured to prevent the thrombi 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, and the inner protective umbrella 4 is pulled to contract radially. The inner protective umbrella 4 is received into the distal end of the inner catheter 3, and then the inner catheter 3 is withdrawn. 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, so that the recovery of the outer protective umbrella 2 and the inner protective umbrella 4 is conveniently completed.

[0059] The inner layer catheter 3 acts as a guide wire connected to the outer layer protective umbrella 2, and the inner layer guide wire 5 and the inner layer catheter 3 can slide relative to each other, so that the inner layer protective umbrella 4 and the outer layer protective umbrella 2 are independently set, and the two protective umbrellas can be released independently, with little impact on each other. The problem that after setting a protective umbrella in the forward direction in the prior art, the second protective umbrella must be set in the reverse direction is solved. At the same time, two protective umbrellas can be released at one time to protect the bifurcated blood vessels.

[0060] In the preferred embodiment of the present invention, 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. By setting two opposing (opposite means that the larger opening end of the outer protective umbrella 2 is close to the larger opening end of the inner protective umbrella 4) protective umbrellas, after the device enters the blood vessel from the posterior communicating artery, it moves toward the other bifurcation, and places the inner protective umbrella 4 at the other bifurcation, so that both protective umbrellas are set in the direction of blood flow.

[0061] In a preferred embodiment of the present invention, the blocking ring 31 is a circular ring made of stainless steel, and 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 guide wire 5. The diameter of the proximal end of the through hole 311 is larger than the diameter of the inner guide wire 5, at least 0.1 mm larger than the diameter of the inner guide wire 5. The purpose of this design is to prevent blood flow from flowing through the inner catheter 3 and reduce bleeding.

[0062] In a preferred embodiment of the present invention, the through hole 311 is arranged along the axial direction of the blocking ring 31, and the diameter of the through hole 311 gradually decreases from the distal end to the proximal end. The side wall of the blocking ring 31 at the through hole 311 is inclined, which contacts the inner guide wire 5 during assembly and guides the inner guide wire 5 to move toward the middle, thereby reducing the difficulty of assembly.

[0063] In a preferred embodiment of the present invention, a recovery guidewire 41 is provided at the proximal end of the inner protective umbrella 4, and the end of the recovery guidewire 41 facing away from the inner protective umbrella 4 is fixedly connected to the inner guidewire 5. The recovery guidewire 41 is made of nickel-titanium alloy, has a certain ductility, and can expand or contract with the inner protective umbrella 4. The proximal end of the recovery 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 recovery guidewire 41 is to first contact with 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 recovery.

[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 more stably connected. On the other hand, it is convenient to fully retract the proximal end of the inner protective umbrella 4 during recovery, thereby facilitating recovery.

[0065] In a preferred embodiment of the present invention, a shaping portion 51 is provided at the distal end of the inner guide wire 5, and the shaping portion 51 is hook-shaped. The shaping process is to insert the distal end of the inner guide wire 5 into the slot of the shaper, which is hook-shaped, and bend the guide wire along the shape of the slot so that the guide wire gradually fits the shape of the slot. The shaping portion 51 is used to reduce the sharp surface of the distal end of the inner guide wire 5, making it easier to enter the adjacent blood vessels, reduce the possibility of puncturing the blood vessels, and facilitate 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 part 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 distance between the shaping part 51 and the distal end of the inner protective umbrella 4 is set longer, and the degree of freedom of the plastic part is higher, reducing the possibility of blood vessel bifurcation.

[0067] In a preferred embodiment of the present invention, 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 catheter 1. Platinum-iridium alloy has good chemical stability, can maintain stable operation in the complex environment of the human body, and reduce stimulation and adverse reactions to human tissues.

[0068] In a preferred embodiment of the present invention, a quick-joint port 11 is provided at the distal end of the outer catheter 1, and a guide wire 12 is passed through the quick-joint port 11 of the outer catheter 1. By providing the quick-joint port 11, in the release stage, the guide wire 12 is inserted from the quick-joint port 11 and first enters the posterior communicating artery, and then guides the outer catheter 1 to the release position. By providing the quick-joint port 11 and inserting the guide wire 12 to guide the outer catheter 1, the difficulty of the outer catheter 1 in place is reduced.

[0069] The following is a detailed description of 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 direction, 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 the opening of 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 conveniently.

[0072] An inner layer catheter 3 is arranged in the cavity of the outer layer catheter 1, and an outer layer protective umbrella 2 is slidably connected to the side wall of the inner layer catheter 3. The outer layer protective umbrella 2 is pressed and gripped in the outer layer catheter 1, and the outer layer protective umbrella 2 is in the shape of an umbrella with a large distal opening diameter and a small proximal opening diameter. The outer layer protective umbrella 2 is woven from memory alloy wire, preferably, woven from nickel-titanium alloy wire. The inner layer catheter 3 is a component made of PTFE, and the inner layer catheter 3 is provided with an inner cavity along its length direction. An inner layer protective umbrella 4 is pressed and gripped at the inner cavity of the inner layer catheter 3, and the inner layer protective umbrella 4 is also made of memory alloy wire. The proximal end of the inner layer protective umbrella 4 is welded, bonded or hot-melted with a recovery guide wire 41, and the middle part of the inner layer protective umbrella 5 is welded with an inner layer guide wire 5, and the end of the recovery guide wire 41 away from the inner layer protective umbrella 4 is welded, bonded or hot-melted with the inner layer guide wire 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 guide wires 41. In a specific embodiment, there are 4 recovery guide wires 41, and the 4 recovery guide wires 41 are distributed in a circular shape with equal intervals in the radial direction. During recovery, the recovery guide wire 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 guide wires 41 can make the inner layer protective umbrella 4 contract evenly, thereby reducing the difficulty of recovering the inner layer protective umbrella 4.

[0074] The outer layer catheter 1 is welded with a limit block 33 located at the proximal end of the outer layer protective umbrella 2, and the distal end of the inner layer catheter 3 is welded with a limit ring 32. The limit ring 32 limits the sliding of the outer layer protective umbrella 2 from the distal end, and the limit block 33 limits the sliding of the outer layer protective umbrella 2 from the proximal end, so that the outer layer protective umbrella 2 can only slide on the side wall of the inner layer catheter 3 and between the limit ring 32 and the limit block 33. At least in the radial direction, the limit block 33 and the limit ring 32 protrude from the side wall of the outer layer catheter 1. The purpose of setting the limit block 33 is to prevent the outer layer protective umbrella 2 from excessively moving along the proximal end of the inner layer guide wire 5, so as to avoid the outer layer protective umbrella 2 from moving with it and being unable to be released when the outer layer catheter 1 is pulled toward the proximal end. The limit ring 32 is made of platinum-iridium alloy wire tightly wound, and the limit ring 32 is fixed to the distal end of the inner layer catheter 3 by bonding, hot-melt connection or welding. Under the development equipment, the limit ring 32 forms a light spot with a brightness different from other parts, thereby assisting doctors in judging the position of the inner layer catheter 3.

[0075] The inner layer catheter 3 is internally welded, hot-melted or bonded with a blocking ring 31, which is 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. The blocking ring is a solid disc, which can improve the blocking ability of emboli and reduce the possibility of blood flowing out of the inner layer 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 to reduce 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 Fig. 9 The distal end of the inner guide wire 5 is provided with a shaping part 51 through shaping. The shaping part 51 is to put the distal end of the inner guide wire into the slot of the shaper 51. The slot is hook-shaped, and the distal end is set to an arc deflected to one side of itself. The inner guide wire 5 is bent along the shape of the slot, so that the inner guide wire 5 gradually fits the shape of the slot. The shaping part 51 is used to reduce the sharp surface of the distal end of the inner guide wire 5, which is convenient for entering the adjacent blood vessels and reducing the possibility of stabbing the blood vessels. The distance between the distal end of the inner protective umbrella 4 and the shaping part 51 is 20mm.

[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 to 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 swells and abuts against the inner wall of the blood vessel. Then, the inner catheter 3 is withdrawn, and the inner protective umbrella 4 is allowed to automatically swell and abut against the inner wall of the blood vessel. At this time, both protective umbrellas are released to cover the bifurcations on both sides to prevent emboli from entering the terminal blood vessels and causing secondary blockage. By adopting the design of a double-layer catheter, two protective umbrellas can be released at one time to protect the bifurcated blood vessels.

[0082] During the 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, and the inner protective umbrella 4 is pulled to contract radially. The inner protective umbrella 4 is received at the distal end of the inner catheter 3, and then the inner catheter 3 is withdrawn. The limit ring 32 on the inner catheter 3 drives the outer protective umbrella 2 to withdraw, and the outer protective umbrella 2 is received in the outer catheter 1, so that the recovery of the outer protective umbrella 2 and the inner protective umbrella 4 is conveniently completed. By using two opposite protective umbrellas, the two protective umbrellas are arranged in the direction of blood flow after being released.

[0083] 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. An intracranial double protection umbrella device, characterized in that: It comprises 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 layer protective umbrella (4) is pressed and gripped inside the inner layer conduit (3); An inner layer guide wire (5) connected to the inner layer protective umbrella (4); The inner layer conduit (3) is provided with a limit block (33) located at the proximal end of the outer layer protective umbrella (2), and the distal end of the inner layer conduit (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 layer protective umbrella (2) on the inner layer conduit (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 opposite 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 blocking ring (31), and the caliber of the through hole (311) gradually decreases 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 layer protective umbrella (4), and one end of the recovery guide wire (41) facing away from the inner layer protective umbrella (4) is fixedly connected to the inner layer 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. An intracranial double protection umbrella device according to any one of claims 1 to 8, characterized in that: The outer catheter (1) is provided with a quick-release port (11) at the distal end thereof, and a leading guide wire (12) is passed through the quick-release port (11) of the outer catheter (1).

10. An 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 catheter (1).

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