A recanalization device for chronic internal carotid artery occlusion

Abstract

The application provides a recanalization device for internal carotid artery chronic occlusion, and relates to the technical field of medical instruments, which comprises a guide wire catheter and a guide wire body arranged in the guide wire catheter; an expansion and contraction assembly is arranged on the guide wire catheter, and the expansion and contraction assembly clamps the guide wire body and abuts against the inner wall of the blood vessel in the expanded state; the expansion and contraction assembly comprises a guide flow sandwich layer arranged in the inner wall of the guide wire catheter, an outer layer expansion and contraction film arranged on the outer side of the distal end of the guide wire catheter and communicated with the guide flow sandwich layer, an inner layer expansion and contraction film arranged on the inner side of the distal end of the guide wire catheter, and a communication hole is arranged on the guide wire catheter and communicated with the inner cavity of the outer layer expansion and contraction film and the inner cavity of the inner layer expansion and contraction film. The outer layer expansion and contraction film is tightly attached to the circumferential wall of the blood vessel after being expanded, so that the guide wire catheter is clamped; the inner layer expansion and contraction film abuts against the side wall of the guide wire body after being expanded, so that the guide wire body is clamped, the guide wire body is supported in the radial direction, the guide wire body is kept in the middle part of the blood vessel, and the possibility of the guide wire entering the false cavity is reduced.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, specifically relating to a device for opening chronic occlusion of the internal carotid artery. Background Technology

[0002] Internal carotid artery occlusion (ICAO) is a significant contributing factor to ischemic stroke. Atherosclerosis is the most common cause of ICAO, frequently occurring at the arterial origin. Damage to the vascular endothelium can gradually progress to atherosclerosis and plaque formation, leading to progressively severe narrowing of the vascular lumen, eventually evolving into CICAO. If the plaque ruptures and bleeds, causing platelet activation and aggregation, it can ultimately develop into local vascular embolism or distal vascular embolism due to plaque detachment; AICAO is related to this. ICAO caused by internal carotid artery dissection commonly occurs 2-3 cm from the bifurcation of the common carotid artery. Damage to the internal carotid artery intima caused by genetic factors, excessive neck movement, infection, etc., can ultimately lead to intimal tearing. Blood enters the dissection between the arterial walls, forming an intramural hematoma, causing narrowing or even occlusion of the internal carotid artery lumen. The speed of intimal tearing plays a decisive role in whether the occlusion is acute or chronic.

[0003] In surgery to open chronic carotid artery occlusion, a microguidewire is inserted into the blood vessel through a vascular sheath. Under fluoroscopic guidance, the microguidewire is attempted to pass through the occluded segment of the internal carotid artery. This is one of the most critical and challenging steps in the surgery because hard plaques may exist within the chronically occluded vessel. When facing hard plaques, it is difficult to insert the guidewire and advance it in the correct direction. Under the pressure of the hard plaques, the guidewire may deviate from its original, ideal arterial lumen and enter a "false lumen" (a false lumen is formed when blood rushes into the media under pressure after an intima-media tear, creating a blood-filled false lumen). At this point, the guidewire is in a dilemma, greatly increasing the probability of surgical complications and seriously affecting the success rate of the surgery.

[0004] Therefore, there is a need to provide an improved technical solution that addresses the shortcomings of the existing technology. Summary of the Invention

[0005] The purpose of this invention is to provide a recanalization device for chronic occlusion of the internal carotid artery, in order to solve the problem that when the guidewire faces hard plaques, it may deviate from the original, ideal arterial lumen and enter the false lumen, which seriously affects the success rate of the operation.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A recanalization device for chronic occlusion of the internal carotid artery includes a guidewire catheter and a guidewire body inserted within the guidewire catheter.

[0008] An expansion assembly is provided on the guidewire catheter, which clamps the guidewire body and abuts against the inner wall of the blood vessel in the expanded state.

[0009] The expansion assembly includes a flow-guiding interlayer disposed inside the sidewall of the guidewire catheter, an outer expansion membrane disposed outside the distal end of the guidewire catheter and communicating with the flow-guiding interlayer, and an inner expansion membrane disposed inside the distal end of the guidewire catheter. The guidewire catheter has a communicating hole that connects the inner cavity of the outer expansion membrane and the inner expansion membrane.

[0010] Preferably, the length of the inner expansion membrane along the axial direction of the guidewire conduit is greater than the length of the inner expansion membrane along the axial direction of the guidewire conduit.

[0011] Preferably, the guidewire catheter includes an inner structural layer and an outer structural layer disposed around the inner structural layer, and the flow guiding interlayer is disposed between the inner structural layer and the outer structural layer.

[0012] Preferably, the connecting hole is annular in the radial direction of the inner structural layer and extends axially along the inner structural layer.

[0013] Preferably, the distal ends of the outer and inner expansion membranes are axially flush with the distal end of the guidewire catheter.

[0014] Preferably, the distal end of the guidewire body is provided with a guide portion, and the distal end surface of the guide portion is arc-shaped.

[0015] Preferably, the guidewire body is provided with a radiopaque section that is connected to the proximal end of the guide section.

[0016] Preferably, the developing section is a developing ring, which is arranged around the side wall of the guidewire body.

[0017] Preferably, the proximal end of the guidewire is provided with a Y-type connecting valve, and one branch of the Y-type connecting valve is connected to the flow guide jacket.

[0018] Preferably, the outer and inner expansion films are made of PTFE, PET, or PU.

[0019] Beneficial effects:

[0020] (1) This invention sets up a guidewire catheter with a diversion layer, an outer shrinkage membrane and an inner shrinkage membrane, and controls the expansion and contraction of the outer shrinkage membrane and the inner shrinkage membrane by injecting and extracting contrast agent. After the outer shrinkage membrane expands, it fits tightly against the circumference of the blood vessel wall to clamp the guidewire catheter. After the inner shrinkage membrane expands, it abuts against the side wall of the guidewire body to clamp the guidewire body and provide radial support for the guidewire body, keeping the guidewire body in the middle of the blood vessel, reducing the possibility of guidewire deviation and entering the false lumen, thereby improving the success rate of the operation.

[0021] (2) By setting an inner expansion film with a longer axial length, the present invention can increase the contact area between the inner expansion film and the guide wire body after expansion, thereby improving the clamping stability and reducing the possibility of the guide wire body entering the false cavity.

[0022] (3) By setting a connecting hole, the connecting hole starts from a starting point on the inner structural layer and extends forward in a spring shape. The contrast agent can enter the inner cavity of the outer expansion membrane more evenly along the axial length of the connecting hole, and the distribution is more uniform. The expansion of the inner expansion membrane is also more uniform, so as to adhere to the side wall of the guide wire body with higher efficiency. Attached Figure Description

[0023] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. Wherein:

[0024] Figure 1 This is a schematic cross-sectional view of the distal portion of the opening device in the expanded state in an embodiment of the present invention.

[0025] Figure 2 This is a schematic cross-sectional view of the opening device in the retracted state in an embodiment of the present invention;

[0026] Figure 3 This is a cross-sectional view of the opening device after it has expanded inside the blood vessel in an embodiment of the present invention.

[0027] In the figure: 1. Guidewire conduit; 11. Inner structural layer; 12. Outer structural layer; 2. Guidewire body; 21. Guiding part; 22. Imaging part; 3. Expansion assembly; 31. Flow guiding layer; 32. Outer expansion membrane; 33. Inner expansion membrane; 34. Connecting hole; 4. Y-type connecting valve. Detailed Implementation

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0029] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0030] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" and "second" may explicitly or implicitly include one or more features.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. 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 or an electrical connection or a connection that allows communication between the two components; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components, an indirect connection, or an interaction between two components.

[0033] In the description of this invention, "before use" refers to the state before the opening device for chronic occlusion of the internal carotid artery is used, before it enters the human body, or before it comes into contact with bodily fluids such as blood and tissue fluid in the human body. "During use" refers to the state after the opening device for chronic occlusion of the internal carotid artery has entered the human body or come into contact with bodily fluids such as blood and tissue fluid in the human body.

[0034] In the description of this invention, "contraction state" refers to the state in which the contrast agent in the "inner layer shrinkage membrane" and the "outer layer shrinkage membrane" is extracted and adheres to each other within a local length range or the entire length range.

[0035] In the description of this invention, "expansion state" refers to a state in which the cavities of the "inner expansion membrane" and the "outer expansion membrane" are filled with contrast agent and do not adhere to each other along their entire length.

[0036] In the description of this invention, "internal environment" refers to the environment below the epidermis of the skin where body fluids are present, such as the dermis and subcutaneous tissue, or the interior of blood vessels and organs.

[0037] In the description of this invention, "proximal" refers to the end closer to the doctor during surgery, and "distal" refers to the end farther from the doctor during surgery.

[0038] The present invention will now be described in detail with reference to embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present invention can be combined with each other.

[0039] This invention addresses the problem in existing technologies where guidewires may deviate from their intended and ideal arterial lumen and enter a false lumen under the pressure of a hard plate. This puts the guidewire in a dilemma, greatly increasing the probability of surgical complications and seriously affecting the success rate of the surgery.

[0040] This invention discloses a device for opening chronic occlusion of the internal carotid artery, with reference to... Figures 1-2 It includes a guidewire conduit 1 and a guidewire body 2 inserted inside the guidewire conduit 1;

[0041] The expansion component 3 is located on the guidewire catheter 1. In the expanded state, it clamps the guidewire body 2 and abuts against the inner wall of the blood vessel.

[0042] The expansion assembly 3 includes a flow-guiding interlayer 31 disposed inside the side wall of the guidewire conduit 1, an outer expansion membrane 32 disposed outside the distal end of the guidewire conduit 1 and communicating with the flow-guiding interlayer 31, an inner expansion membrane 33 disposed inside the distal end of the guidewire conduit 1, and a communicating hole 34 on the guidewire conduit 1 connecting the inner cavity of the outer expansion membrane 32 and the inner cavity of the inner expansion membrane 33.

[0043] The guidewire catheter 1 is preferably made of stainless steel, which gives it a certain degree of rigidity. Stainless steel also has strong chemical stability, reducing its impact on the body's internal environment. The guidewire body 2 is also made of stainless steel.

[0044] The guidewire conduit 1 has an inner lumen along its length, and the inner lumen extends through the guidewire conduit 1. Preferably, the guidewire conduit 1 is a hollow cylinder. The radial diameter of the inner lumen is 0.1-0.15 mm larger than the radial diameter of the guidewire body 2 (e.g., 0.1 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm). The inner lumen of the guidewire conduit 1 allows the guidewire body 2 to pass through.

[0045] Both the outer expansion membrane 32 and the inner expansion membrane 33 are fixed to the flow guiding interlayer 31 by adhesive bonding.

[0046] Reference Figure 1 and Figure 3 Preferably, the drainage clip 31 extends from the proximal end to the distal end along the axial direction of the guidewire catheter 1. During use, the proximal end of the drainage clip 31 is located outside the body. Contrast agent is injected into the drainage clip 31, allowing it to fill the clip and enter the lumen of the outer expansion membrane 32. The outer expansion membrane 32 is preferably made of PTFE material, which has a certain degree of extensibility. After being filled with contrast agent, it gradually expands. Because the drainage clip 31 is made of stainless steel, it has high structural strength, thus the outer expansion membrane 32 expands towards the vessel wall until it adheres to the vessel wall. Since the outer expansion membrane 32 covers the guidewire catheter 1 circumferentially, it expands and fits tightly against the vessel wall circumferentially, clamping the guidewire catheter 1 and fixing it distally.

[0047] After the contrast agent is injected into the lumen of the outer bulging membrane 32, it enters the inner bulging membrane 33 through the connecting hole 34. The inner bulging membrane 33 is preferably made of PTFE material, which has a certain degree of extensibility. After being filled with contrast agent, it gradually expands and abuts against the side wall of the guidewire body 2, thereby clamping the guidewire body 2 and providing radial support to keep the guidewire body 2 in the middle of the blood vessel, reducing the possibility of guidewire deviation and entry into the false lumen. Because the inner bulging membrane 33 is located close to the occlusion site of the blood vessel, it can provide better anti-deviation effect and increase the success rate of the operation.

[0048] It should be noted that the inner expansion membrane 33 is provided with a hydrophilic coating on the surface that contacts the guide wire body 2. The hydrophilic coating is preferably made of polyethylene glycol. Polyethylene glycol can attract water molecules to form a lubricating layer, reduce the friction between the inner expansion membrane 33 and the guide wire body 2, and allow the inner expansion membrane 33 and the guide wire body 2 to slide relative to each other in the axial direction.

[0049] During recovery, the contrast agent is extracted, causing both the outer and inner expansion membranes 32 and 33 to shrink and adhere to the guidewire conduit 1, reducing frictional resistance. Then, the guidewire conduit 1 and guidewire body 2 are pulled out proximally to achieve recovery of the device.

[0050] In a preferred embodiment of the present invention, the inner expansion membrane 33 has a longer axial length along the guidewire conduit 1 than the outer expansion membrane 32 has. By providing a longer axial inner expansion membrane 33, the contact area between the inner expansion membrane 33 and the guidewire body 2 after expansion can be increased, thereby improving clamping stability and reducing the possibility of the guidewire body 2 entering a false lumen.

[0051] In a preferred embodiment of the present invention, the guidewire catheter 1 includes an inner structural layer 11 and an outer structural layer 12 disposed around the inner structural layer 11, with a flow-guiding interlayer 31 disposed between the inner structural layer 11 and the outer structural layer 12. It should be noted that the proximal ends of the inner structural layer 11 and the outer structural layer 12 are welded together, preventing contrast agent from passing through, allowing the contrast agent to flow distally along the flow-guiding interlayer 31 after injection.

[0052] Reference Figure 2 In a preferred embodiment of the present invention, the connecting hole 34 is annular in the radial direction of the inner structural layer 11 and extends along the axial direction of the inner structural layer 11. Here, the connecting hole 34 refers to the projection on the radial direction and the central axis of the inner structural layer 11, respectively. It can be understood that in the three-dimensional structure, the connecting hole 34 starts from a starting point on the inner structural layer 11 and extends forward in a spring-like shape. The purpose of this setting is to allow the contrast agent to enter the inner cavity of the inner expansion membrane more evenly along the axial length of the connecting hole 34, so that the contrast agent entering the inner cavity of the inner expansion membrane is more evenly distributed, and the expansion of the inner expansion membrane is more even, so as to adhere to the sidewall of the guidewire body 2 with higher efficiency.

[0053] In a preferred embodiment of the present invention, the distal ends of the outer expansion membrane 32 and the inner expansion membrane 33 are axially aligned with the distal end of the guidewire catheter 1. The distal end of the outer expansion membrane 32 is adhered to the outer side of the inner structural layer 11, and the inner expansion membrane 33 is adhered to the inner side of the inner structural layer 11. The purpose of this design is to position the outer expansion membrane 32 and the inner expansion membrane 33 as distally as possible, so as to be closer to the vascular occlusion site and achieve a better anti-deviation effect.

[0054] In a preferred embodiment of the present invention, a guide portion 21 is provided at the distal end of the guidewire body 2, and the distal end surface of the guide portion 21 is arc-shaped. The guide portion 21 is fixed to the guidewire body 2 by welding, and the distal end of the guide portion 21 is set into an arc shape without sharp edges, thereby improving the flexibility of the guidewire body 2.

[0055] In a preferred embodiment of the present invention, the guidewire body 2 is provided with a radiopaque section 22 that is connected to the proximal end of the guide section 21. The radiopaque section 22 is made of a radiopaque material, such as a platinum-iridium alloy or platinum, and is used to assist the doctor in determining the position of the tip of the guidewire body 2.

[0056] In a preferred embodiment of the present invention, the imaging section 22 is an imaging ring, which is filamentous and wound around the side wall of the guidewire body 2. The imaging ring is tightly connected to the side wall of the guidewire body 2. Under imaging equipment, the imaging ring displays a different light spot than other parts, assisting the doctor in determining the position of the distal end of the guidewire. Simultaneously, the radial diameter of the imaging ring is larger than the radial diameter of the guidewire body 2. In the expanded state, after pulling the guidewire body 2 proximally a certain length, the imaging ring contacts the inner expansion membrane 33, preventing the guidewire conductor from slipping proximally and hindering surgical operations.

[0057] In a preferred embodiment of the present invention, a Y-type connecting valve 4 is provided at the proximal end of the guidewire catheter 1, and one branch of the Y-type connecting valve 4 communicates with the flow guiding layer 31. The Y-type connecting valve 4 and the guidewire catheter 1 are connected by a Luer connection to prevent leakage. One opening of the Y-type connecting valve 4 communicates with the inner lumen of the guidewire catheter 1 for the guidewire body 2 to pass through, and the other communicates with the flow guiding layer 31 to facilitate the injection of contrast agent.

[0058] In a preferred embodiment of the present invention, the outer shrinkable membrane 32 and the inner shrinkable membrane 33 are made of PTFE, PET, or PU. PTFE has good biocompatibility, excellent lubricity, strong chemical stability, and good flexibility and elastic recovery ability, making it a preferred material for manufacturing expandable membranes.

[0059] In other embodiments of this application, the outer expansion membrane 32 and the inner expansion membrane 33 can be made of PET film. PET film has good imaging performance, which makes it easier for doctors to determine the positional relationship between the device and blood vessels.

[0060] In other embodiments of this application, the outer shrinkage membrane 32 and the inner shrinkage membrane 33 can be made of PU membrane. PU material has good biocompatibility, excellent elasticity and flexibility, and good structural strength, which can prevent the outer shrinkage membrane 32 and the inner shrinkage membrane 33 from rupturing and causing contrast agent leakage.

[0061] The following detailed description of a recanalization device for chronic occlusion of the internal carotid artery according to the present invention is provided through specific embodiments.

[0062] Example 1

[0063] This embodiment provides a device for opening chronic occlusion of the internal carotid artery, as shown in the figure. It includes a guidewire catheter 1 with an axially penetrating inner lumen, and a guidewire body 2 passing through the inner lumen of the guidewire catheter 1.

[0064] Specifically, the radial diameter of the inner lumen of the guidewire catheter 1 is 0.1 mm larger than the radial diameter of the guidewire body 2.

[0065] Preferably, the guidewire body 2 is made of stainless steel, and the guidewire catheter 1 is made of stainless steel.

[0066] The guidewire catheter 1 includes an inner structural layer 11 and an outer structural layer 12 welded proximally to the inner structural layer 11. A flow-guiding interlayer 31 is formed between the inner structural layer 11 and the outer structural layer 12. The flow-guiding interlayer 31 extends to the distal end of the guidewire catheter 1. Contrast agent is not allowed to pass through the proximal weld between the inner structural layer 11 and the outer structural layer 12.

[0067] An inner expandable membrane 33 is adhered to the inner wall of the inner structural layer 11, and an outer expandable membrane 32 is adhered to the outer wall of the inner structural layer 11. The cavity formed by the outer expandable membrane 32 communicates with the flow-guiding interlayer 31. A connecting hole 34 is provided on the inner structural layer 11 to connect the cavities of the outer expandable membrane 32 and the inner expandable membrane 33. Both the inner expandable membrane 33 and the outer expandable membrane 32 are made of PTFE material and have expandable properties. PTFE has good biocompatibility, excellent lubricity, strong chemical stability, and good flexibility and elastic recovery ability, making it a preferred material for manufacturing expandable membranes.

[0068] When the contrast agent is injected, it flows along the guide jacket 31 into the inner cavity of the outer expandable membrane 32, and then into the inner cavity of the inner expandable membrane 33. Because the guide jacket 31 is made of stainless steel and has high structural strength, the outer expandable membrane 32 expands towards the vessel wall until it adheres to the vessel wall, while the inner expandable membrane 33 expands towards the center until it adheres to the guidewire body 2. The outer expandable membrane 32 covers the guidewire catheter 1 circumferentially. Therefore, after the outer expandable membrane 32 expands, it adheres tightly to the circumferential wall of the vessel, clamping the guidewire catheter 1 and fixing it distally. The inner expandable membrane 33 clamps the guidewire body 2, and since the inner expandable membrane 33 is located close to the occlusion site, it can provide better anti-deviation effect and increase the success rate of the operation.

[0069] Preferably, the distal ends of the outer expansion membrane 32 and the inner expansion membrane 33 are axially aligned with the distal end of the guidewire catheter 1, so that the outer expansion membrane 32 and the inner expansion membrane 33 are located as far as possible at the distal end, so as to be closer to the vascular occlusion site and achieve a better anti-deviation effect on the distal end of the guidewire body 2.

[0070] Preferably, a guide portion 21 is provided at the distal end of the guidewire body 2, and the distal end surface of the guide portion 21 is arc-shaped. The guide portion 21 is fixed to the guidewire body 2 by welding, and the distal end of the guide portion 21 is set into an arc shape without sharp edges to improve the flexibility of the guidewire body 2.

[0071] Preferably, a radiopaque portion 22 is adhered to the guidewire body 2. The radiopaque portion 22 is made of a radiopaque material, such as a platinum-iridium alloy or platinum, and is used to assist the physician in determining the position of the tip of the guidewire body 2. The radiopaque portion 22 is annular. In the expanded state, after the guidewire body 2 is pulled proximally a certain length, the radiopaque ring contacts the inner expansion membrane 33, preventing the guidewire conductor from slipping proximally.

[0072] Example 2

[0073] Reference Figure 2This embodiment, based on Embodiment 1, further elaborates on the structure of the connecting hole 34. The connecting hole 34 is annular in the radial direction of the inner structural layer 11 and extends along the axial direction of the inner structural layer 11. Here, the connecting hole 34 refers to the projection on the radial direction and the central axis of the inner structural layer 11, respectively. It can be understood that, in the three-dimensional structure, the connecting hole 34 starts from a starting point on the inner structural layer 11 and extends forward in a spring-like shape. The purpose of this setting is to allow the contrast agent to enter the inner cavity of the inner expansion membrane more evenly along the axial length of the connecting hole 34, so that the contrast agent entering the inner cavity of the inner expansion membrane is more evenly distributed, and the expansion of the inner expansion membrane is more even, so as to adhere to the side wall of the guidewire body 2 with higher efficiency.

[0074] Example 3

[0075] Reference Figure 2 Based on Example 1, this embodiment further elaborates on the guidewire catheter 1. The proximal end of the guidewire catheter 1 is connected to a Y-type connecting valve 4 by a Luer connection. One opening of the Y-type connecting valve 4 communicates with the inner lumen of the guidewire catheter 1 to allow the guidewire body 2 to pass through, and the other opening communicates with the flow guide layer 31 to facilitate the injection of contrast agent.

[0076] In summary, this invention, by setting up a guidewire catheter 1 with a flow-guiding layer 31, an outer expansion membrane 32, and an inner expansion membrane 33, controls the expansion and contraction of the outer and inner expansion membranes 32 and 33 through the injection and extraction of contrast agent. After expansion, the outer expansion membrane 32 fits tightly against the circumferential wall of the blood vessel, clamping the guidewire catheter 1. After expansion, the inner expansion membrane 33 abuts against the side wall of the guidewire body 2, clamping the guidewire body 2 and providing radial support. This overcomes the problem in the prior art where the distal end of the guidewire is not strong enough and may deviate from the original, ideal arterial lumen and enter a false lumen under the pressure of hard plaques.

[0077] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A device for opening chronic occlusion of the internal carotid artery, characterized in that, The device includes a guidewire catheter (1) and a guidewire body (2) inserted inside the guidewire catheter (1); and a shrinking assembly (3) disposed on the guidewire catheter (1), which clamps the guidewire body (2) and abuts against the inner wall of the blood vessel in an expanded state; wherein the shrinking assembly (3) includes a flow-guiding interlayer (31) disposed inside the side wall of the guidewire catheter (1), an outer shrinking membrane (32) disposed on the outer side of the distal end of the guidewire catheter (1) and communicating with the flow-guiding interlayer (31), and an inner shrinking membrane (33) disposed on the inner side of the distal end of the guidewire catheter (1), and the guidewire catheter (1) has a communicating hole (34) communicating with the inner lumen of the outer shrinking membrane (32) and the inner lumen of the inner shrinking membrane (33). The inner expansion membrane (33) has a longer length along the axial direction of the guidewire conduit (1) than the outer expansion membrane (32) has a longer length along the axial direction of the guidewire conduit (1). The distal ends of the outer and inner expansion membranes are axially flush with the distal end of the guidewire catheter. The flow guide jacket (31) is made of stainless steel and extends from the proximal end to the distal end along the axial direction of the guide wire conduit (1). When the contrast agent is injected, the contrast agent flows along the guide layer (31) to the inner lumen of the outer expansion membrane (32), and then enters the inner lumen of the inner expansion membrane (33). After the outer expansion membrane (32) expands, it fits tightly against the circumferential wall of the blood vessel, thereby clamping the guidewire catheter (1) and fixing the guidewire catheter (1) at the distal end. The inner expansion membrane (33) clamps the guide wire body (2), and the surface of the inner expansion membrane (33) in contact with the guide wire body (2) is provided with a hydrophilic coating. The hydrophilic coating is made of polyethylene glycol. Polyethylene glycol attracts water molecules to form a lubricating layer, and the inner expansion membrane (33) and the guide wire body (2) can slide relative to each other in the axial direction.

2. The recanalization device for chronic occlusion of the internal carotid artery according to claim 1, characterized in that, The guidewire catheter (1) includes an inner structural layer (11) and an outer structural layer (12) disposed around the inner structural layer (11), and the flow guide interlayer (31) is disposed between the inner structural layer (11) and the outer structural layer (12).

3. The recanalization device for chronic occlusion of the internal carotid artery according to claim 2, characterized in that, The connecting hole (34) is annular in the radial direction of the inner structural layer (11) and extends axially along the inner structural layer (11).

4. The recanalization device for chronic occlusion of the internal carotid artery according to claim 1, characterized in that, The guide wire body (2) has a guide part (21) at its distal end, and the distal end surface of the guide part (21) is arc-shaped.

5. The recanalization device for chronic occlusion of the internal carotid artery according to claim 4, characterized in that, The guidewire body (2) is provided with a imaging section (22) that is connected to the proximal end of the guide section (21).

6. The recanalization device for chronic occlusion of the internal carotid artery according to claim 5, characterized in that, The developing section (22) is a developing ring, which is arranged around the side wall of the guide wire body (2).

7. A recanalization device for chronic occlusion of the internal carotid artery according to any one of claims 1-6, characterized in that, The proximal end of the guidewire catheter (1) is provided with a Y-type connecting valve (4), and one branch of the Y-type connecting valve (4) is connected to the flow guide jacket (31).

8. A recanalization device for chronic occlusion of the internal carotid artery according to any one of claims 1-6, characterized in that, The outer shrinkage film (32) and the inner shrinkage film (33) are made of PTFE, PET, or PU.

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