Opening device for chronic internal carotid artery occlusion

Abstract

The invention provides an opening device for chronic internal carotid artery occlusion, and relates to the technical field of medical instruments. The opening device comprises a guide wire catheter and a guide wire body arranged in the guide wire catheter in a penetrating manner; the expansion and contraction assembly is arranged on the guide wire catheter, clamps the guide wire body in an expansion state and abuts against the inner wall of the blood vessel; the expansion and contraction assembly comprises a flow guide interlayer arranged in the side wall of the guide wire catheter, an outer-layer expansion and contraction film arranged on the outer side of the far end of the guide wire catheter and communicated with the flow guide interlayer, and an inner-layer expansion and contraction film arranged on the inner side of the far end of the guide wire catheter. A communicating hole communicating an inner cavity of the outer-layer expansion and contraction film with an inner cavity of the inner-layer expansion and contraction film is formed in the guide wire catheter. The outer swelling and shrinking film is tightly attached to the periphery of the blood vessel wall after being swelled, and clamping of the guide wire catheter is achieved; the inner-layer swelling and shrinking film abuts against the side wall of the guide wire body after being swelled, clamping of the guide wire body is achieved, the guide wire body is supported in the radial direction, the guide wire body is kept in the middle of a blood vessel, and the possibility that the guide wire enters a false cavity is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and particularly relates to a device for opening chronic occlusion of the internal carotid artery. Background Art

[0002] Internal carotid artery occlusion (ICAO) is one of the important factors leading to ischemic stroke. Atherosclerosis is the most common cause of ICAO, which often occurs at the origin of the artery. Damage to the vascular endothelium can gradually progress to atherosclerosis and form plaques, resulting in a gradual high degree of stenosis of the vascular lumen and ultimately evolving into CICAO; once the plaque ruptures and bleeds, causing platelet activation and aggregation, it can ultimately develop into local vascular embolism or distal vascular embolism caused by plaque detachment, and AICAO is exactly related to this. ICAO caused by internal carotid artery dissection is prone to occur at a position 2 - 3 cm away from the bifurcation of the common carotid artery. Endothelial injury of the internal carotid artery caused by genetic factors, excessive neck movement, infection, etc. can ultimately lead to arterial intimal tear. Blood enters the dissection between the arterial walls to form a hematoma within the wall, causing the lumen of the internal carotid artery to become narrow or even occluded. The speed of arterial intimal tear determines the acute or chronic evolution of occlusion.

[0003] In the operation of opening chronic occlusion of the internal carotid artery, a micro-guidewire is sent into the blood vessel through a vascular sheath, and under fluoroscopic guidance, an attempt is made to let the micro-guidewire pass through the occluded segment of the internal carotid artery. This is one of the most critical and difficult steps in the operation because there may be hard plaques in the chronically occluded blood vessel. When the guidewire faces the hard plaque, it is very difficult to insert and advance along the correct direction. Under the extrusion of the hard plaque, the guidewire may deviate from the original and ideal arterial lumen and enter the "false lumen" (the false lumen refers to a blood-filled false lumen formed when the arterial intima tears and blood rushes into the middle layer under the action of pressure). At this time, the guidewire will be in a dilemma, and the probability of surgical complications will increase significantly, seriously affecting the success rate of the operation.

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

[0005] The purpose of the present invention is to provide a device for opening chronic occlusion of the internal carotid artery to solve the problem that when the guidewire faces a hard plaque, the guidewire may deviate from the original and ideal arterial lumen and enter the false lumen, seriously affecting the success rate of the operation.

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

[0007] A device for opening chronic occlusion of the internal carotid artery includes a guidewire catheter and a guidewire body disposed within the guidewire catheter;

[0008] A telescopic component is provided on the guide wire catheter, which clamps the guide wire body and abuts against the inner wall of the blood vessel in the expanded state;

[0009] Wherein, the telescopic component includes a diversion interlayer provided inside the side wall of the guide wire catheter, an outer telescopic film provided outside the distal end of the guide wire catheter and communicated with the diversion interlayer, and an inner telescopic film provided inside the distal end of the guide wire catheter. A communication hole is provided on the guide wire catheter to communicate the inner cavity of the outer telescopic film and the inner cavity of the inner telescopic film.

[0010] Preferably, the length of the inner telescopic film along the axial direction of the guide wire catheter is greater than the length of the inner telescopic film along the axial direction of the guide wire catheter.

[0011] Preferably, the guide wire catheter includes an inner structural layer and an outer structural layer provided on the periphery of the inner structural layer, and the diversion interlayer is provided between the inner structural layer and the outer structural layer.

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

[0013] Preferably, the distal ends of the outer telescopic film and the inner telescopic film are flush with the distal end of the guide wire catheter in the axial direction.

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

[0015] Preferably, a developing portion is provided on the guide wire body and connected to the proximal end of the guiding portion.

[0016] Preferably, the developing portion is a developing ring, and the developing ring is wound around the side wall of the guide wire body.

[0017] Preferably, a Y-shaped connection valve is provided at the proximal end of the guide wire catheter, and one branch of the Y-shaped connection valve is communicated with the diversion interlayer.

[0018] Preferably, the outer telescopic film and the inner telescopic film are made of one of PTFE, PET, and PU.

[0019] Beneficial effects:

[0020] (1) The present invention realizes the expansion and contraction of the outer expansion and contraction film and the inner expansion and contraction film by injecting and extracting contrast agent through the provision of a guide wire catheter with a diversion interlayer, an outer expansion and contraction film, and an inner expansion and contraction film. After the outer expansion and contraction film expands, it closely adheres to the circumference of the blood vessel wall to realize the clamping of the guide wire catheter. After the inner expansion and contraction film expands, it abuts against the side wall of the guide wire body to realize the clamping of the guide wire body, providing radial support to the guide wire body, keeping the guide wire body in the middle position of the blood vessel, reducing the possibility of the guide wire deviating and entering the false lumen, thereby improving the success rate of the operation;

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

[0022] (3) The present invention provides a communication hole that starts from a starting point on the inner structure layer and extends forward in a spring shape. The contrast agent can enter the inner cavity of the outer expansion film more evenly along the axial length of the communication hole, with a more uniform distribution, and the expansion of the inner expansion film is also more uniform, fitting the side wall of the guide wire body with higher efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The schematic diagrams in the specification that form a part of this application are used to provide a further understanding of the present invention. The illustrative 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:

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

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

[0026] Figure 3 is a schematic cross-sectional view of the opening device in the blood vessel and expanded in an embodiment of the present invention.

[0027] In the figure: 1. Guide wire catheter; 11. Inner structure layer; 12. Outer structure layer; 2. Guide wire body; 21. Guide portion; 22. Visualization portion; 3. Expansion and contraction assembly; 31. Diversion interlayer; 32. Outer expansion and contraction film; 33. Inner expansion and contraction film; 34. Communication hole; 4. Y-shaped connection valve. DETAILED DESCRIPTION OF THE INVENTION

[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, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention belong to the scope of protection of the present invention.

[0029] In the description of the present invention, it should be understood that for the orientation description, such as the orientation or positional relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 construed as a limitation to the present invention.

[0030] In the description of the present invention, the meaning of "several" is one or more, the meaning of "multiple" is more than two, and understandings such as "greater than", "less than", "exceeding", etc. do not include the recited number, and understandings such as "above", "below", "within", etc. include the recited number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0031] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more features.

[0032] 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, or a detachable connection or an inseparable connection, or an integral connection; it can be a mechanical connection, an electrical connection or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements, indirect communication or the interaction relationship between two elements.

[0033] In the description of the present invention, "before use" refers to the state before the device for opening chronic occlusion of the internal carotid artery is not used, not inserted into the human body or not in contact with body fluids such as blood and tissue fluid in the human body, and "during use" refers to the state after the device for opening chronic occlusion of the internal carotid artery has been inserted into the human body or is in contact with body fluids such as blood and tissue fluid in the human body.

[0034] In the description of the present invention, the "contracted state" refers to the state in which the contrast agents in the "inner expansion and contraction film" and the "outer expansion and contraction film" are pumped out and they are attached to each other within a partial length range or the entire length range.

[0035] In the description of the present invention, the "expanded state" refers to a state in which the inner cavities of the "inner expandable and contractible film" and the "outer expandable and contractible film" are filled with a contrast agent and do not adhere to each other within the entire length thereof.

[0036] 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 layer and subcutaneous tissue, or the inside of blood vessels, organs, etc.

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

[0038] The present invention will be described in detail below with reference to embodiments. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other.

[0039] In the prior art, the guide wire may deviate from the original and ideal arterial lumen under the extrusion of a hard plaque and enter the false lumen, putting the guide wire in a dilemma and greatly increasing the probability of surgical complications, seriously affecting the success rate of the operation.

[0040] The present invention discloses a device for opening chronic occlusion of the internal carotid artery, referring to Figure 1 - Figure 2 , which includes a guide wire catheter 1 and a guide wire body 2 disposed inside the guide wire catheter 1;

[0041] An expandable and contractible assembly 3 is disposed on the guide wire catheter 1, which clamps the guide wire body 2 and abuts against the inner wall of the blood vessel in the expanded state;

[0042] Among them, the expandable and contractible assembly 3 includes a diversion sandwich layer 31 disposed inside the side wall of the guide wire catheter 1, an outer expandable and contractible film 32 disposed outside the distal end of the guide wire catheter 1 and communicating with the diversion sandwich layer 31, an inner expandable and contractible film 33 disposed inside the distal end of the guide wire catheter 1, and a communication hole 34 is formed on the guide wire catheter 1 to communicate the inner cavity of the outer expandable and contractible film 32 and the inner cavity of the inner expandable and contractible film 33.

[0043] The guide wire catheter 1 is preferably made of stainless steel material, so that the guide wire catheter 1 has a certain hardness. At the same time, the chemical stability of stainless steel is relatively strong, which can reduce the influence on the in-vivo environment. The guide wire body 2 is also made of stainless steel material.

[0044] The guide wire catheter 1 is provided with an inner cavity along its length direction, and the inner cavity penetrates the guide wire catheter 1. Preferably, the guide wire catheter 1 is in a hollow cylindrical shape. The diameter of the inner cavity in the radial direction is 0.1-0.15 mm larger than the diameter of the guide wire body 2 in the radial direction (for example, 0.1 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm). The inner cavity of the guide wire catheter 1 is for the guide wire body 2 to pass through.

[0045] Both the outer expandable and contractible membrane 32 and the inner expandable and contractible membrane 33 are fixed to the diversion sandwich layer 31 by bonding.

[0046] Referring to Figure 1 and Figure 3 Preferably, the diversion sandwich layer 31 extends from the proximal end to the distal end along the axial direction of the guide wire catheter 1. During use, the proximal end of the diversion sandwich layer 31 is located outside the body. Inject contrast agent into the diversion sandwich layer 31 to fill the diversion sandwich layer 31 and enter the inner cavity of the outer expandable and contractible membrane 32. The outer expandable and contractible membrane 32 is preferably made of PTFE material and has a certain ductility. After filling with contrast agent, it gradually expands. Since the diversion sandwich layer 31 is made of stainless steel and has a relatively high structural strength, the outer expandable and contractible membrane 32 expands towards the blood vessel wall until it fits the blood vessel wall. Since the outer expandable and contractible membrane 32 covers the guide wire catheter 1 in the circumferential direction, after the outer expandable and contractible membrane 32 expands, it is in close circumferential contact with the blood vessel wall, realizing the clamping of the guide wire catheter 1 and fixing the guide wire catheter 1 at the distal end.

[0047] After the contrast agent is injected into the inner cavity of the outer expandable and contractible membrane 32, it will enter the inner expandable and contractible membrane 33 through the communication hole 34. The inner expandable and contractible membrane 33 is preferably made of PTFE material and has a certain ductility. After filling with contrast agent, it gradually expands and abuts against the side wall of the guide wire body 2, realizing the clamping of the guide wire body 2 and providing radial support for the guide wire body 2, keeping the guide wire body 2 in the middle position of the blood vessel and reducing the possibility of the guide wire deviating and entering the false lumen. Since the inner expandable and contractible membrane 33 is located close to the blood vessel occlusion site, it can achieve a better anti-deviation effect and increase the success rate of the operation.

[0048] It should be noted that a hydrophilic coating is provided on the surface of the inner expandable and contractible membrane 33 in contact with the guide wire body 2. The hydrophilic coating is preferably polyethylene glycol, which can attract water molecules to form a lubricating layer, reducing the friction between the inner expandable and contractible membrane 33 and the guide wire body 2, so that the inner expandable and contractible membrane 33 and the guide wire body 2 can slide relative to each other axially.

[0049] During recovery, the contrast agent is withdrawn to cause both the outer expandable and contractible membrane 32 and the inner expandable and contractible membrane 33 to contract and adhere to the guide wire catheter 1, reducing the frictional resistance; then the guide wire catheter 1 and the guide wire body 2 are pulled proximally to recover the device.

[0050] In the preferred embodiment of the present invention, the length of the inner expandable and contractible membrane 33 along the axial direction of the guide wire catheter 1 is greater than the length of the outer expandable and contractible membrane 32 along the axial direction of the guide wire catheter 1. By setting the inner expandable and contractible membrane 33 with a longer axial length, the contact area between the inner expandable and contractible membrane 33 and the guide wire body 2 after expansion can be increased, thereby improving the clamping stability and reducing the possibility of the guide wire body 2 entering the false lumen.

[0051] In a preferred embodiment of the present invention, the guide wire catheter 1 includes an inner structural layer 11 and an outer structural layer 12 disposed outside the inner structural layer 11, and a diversion interlayer 31 is 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 connected by welding, and contrast agent is not allowed to pass through, so that the injected contrast agent flows along the diversion interlayer 31 towards the distal end.

[0052] Referring to Figure 2 , in a preferred embodiment of the present invention, the communication holes 34 are annular in the radial direction of the inner structural layer 11 and extend along the axial direction of the inner structural layer 11. Here, the communication holes 34 respectively refer to the projections on the radial direction and the central axis of the inner structural layer 11. It can be understood that: in the three-dimensional structure, the communication holes 34 start from a starting point on the inner structural layer 11 and extend forward in a spring shape. The purpose of this setting is to allow the contrast agent to enter the inner cavity of the inner expansion film more evenly along the axial length of the communication holes 34, so that the contrast agent entering the inner cavity of the inner expansion film is more evenly distributed, and the expansion of the inner expansion film is also more uniform, so as to fit the side wall of the guide wire body 2 with higher efficiency.

[0053] In a preferred embodiment of the present invention, the distal ends of the outer expansion and contraction film 32 and the inner expansion and contraction film 33 are flush with the distal end of the guide wire catheter 1 in the axial direction. The distal end of the outer expansion and contraction film 32 is bonded to the outside of the inner structural layer 11, and the inner expansion and contraction film 33 is bonded to the inside of the inner structural layer 11. The purpose of this design is to make the outer expansion and contraction film 32 and the inner expansion and contraction film 33 as close as possible to the distal end, 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 guiding portion 21 is provided at the distal end of the guide wire body 2, and the distal end surface of the guiding portion 21 is arc-shaped. The guiding portion 21 is fixed to the guide wire body 2 by welding, and the distal end of the guiding portion 21 is set to be arc-shaped without edges and corners, so as to improve the flexibility of the guide wire body 2.

[0055] In a preferred embodiment of the present invention, a visualization portion 22 connected to the proximal end of the guiding portion 21 is provided on the guide wire body 2. The visualization portion 22 is made of a visualization material, such as platinum-iridium alloy, platinum and other materials, and is used to assist the doctor in judging the position of the front end of the guide wire body 2.

[0056] In a preferred embodiment of the present invention, the visualization portion 22 is a visualization ring, and the visualization ring is filamentous and wound around the side wall of the guide wire body 2. The visualization ring is disposed around the side wall of the guide wire body 2 and is tightly connected to the guide wire body 2. Under the visualization device, the visualization ring shows light spots different from other parts to assist the doctor in judging the position of the distal end of the guide wire. At the same time, the radial diameter at the visualization ring is larger than the radial diameter of the guide wire body 2. In the expanded state, after pulling the guide wire body 2 a certain length towards the proximal end, the visualization ring contacts the inner expansion and contraction film 33 to prevent the guide wire conductor from slipping out towards the proximal end and making it inconvenient for surgical operation.

[0057] In a preferred embodiment of the present invention, a Y-shaped connection valve 4 is provided at the proximal end of the guide wire catheter 1, and one bifurcation of the Y-shaped connection valve 4 communicates with the diversion interlayer 31. The Y-shaped connection valve 4 and the guide wire catheter 1 adopt a Luer connection method to prevent liquid leakage. One opening of the Y-shaped connection valve 4 communicates with the inner cavity of the guide wire catheter 1 for the guide wire body 2 to pass through, and the other communicates with the diversion interlayer 31 to facilitate the injection of contrast agent.

[0058] In a preferred embodiment of the present invention, the outer expandable and contractible film 32 and the inner expandable and contractible film 33 are made of one of PTFE, PET, and PU. PTFE has good biocompatibility, excellent lubricity, strong chemical stability, good flexibility and elastic recovery ability, and is a preferred material for making expandable and contractible films.

[0059] In other embodiments of the present application, the outer expandable and contractible film 32 and the inner expandable and contractible film 33 can adopt PET film. The imaging performance of PET film is good, which can facilitate doctors to judge the positional relationship between the device and the blood vessel.

[0060] In other embodiments of the present application, the outer expandable and contractible film 32 and the inner expandable and contractible film 33 can adopt PU film. The PU material has good biocompatibility, excellent elasticity and flexibility, and also has good structural strength to prevent the outer expandable and contractible film 32 and the inner expandable and contractible film 33 from rupturing and causing contrast agent leakage.

[0061] The following will detail a device for opening chronic occlusion of the internal carotid artery according to the present invention through specific embodiments.

[0062] Embodiment 1

[0063] This embodiment provides a device for opening chronic occlusion of the internal carotid artery. As shown in the figure, it includes a guide wire catheter 1. The guide wire catheter 1 is provided with an axially penetrating inner cavity, and the guide wire body 2 is disposed in the inner cavity of the guide wire catheter 1.

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

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

[0066] The guide wire catheter 1 includes an inner structural layer 11 and an outer structural layer 12 welded to the proximal end of the inner structural layer 11. The interlayer between the inner structural layer 11 and the outer structural layer 12 is the diversion interlayer 31. The diversion interlayer 31 extends all the way to the distal end of the guide wire catheter 1. The welding joint at the proximal end of the inner structural layer 11 and the outer structural layer 12 does not allow contrast agent to pass through.

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

[0068] When contrast agent is injected, the contrast agent flows along the guiding interlayer 31 to the inner cavity of the outer expansion membrane 32, and then enters the inner cavity of the inner expansion membrane 33. Because the guiding interlayer 31 is made of stainless steel and has a high structural strength, the outer expansion membrane 32 expands toward the blood vessel wall until it fits the blood vessel wall, and the inner expansion membrane 33 expands toward the middle until it fits the guide wire body 2. The outer expansion membrane 32 covers the guide wire catheter 1 in the circumferential direction. Therefore, after the outer expansion membrane 32 expands, it fits tightly with the circumference of the blood vessel wall, thereby clamping the guide wire catheter 1 and fixing the guide wire catheter 1 at the distal end. The inner expansion membrane 33 clamps the guide wire body 2, and the inner expansion membrane 33 is located near the occluded part of the blood vessel, which can play a 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 flush 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 to be closer to the vascular occlusion, thereby achieving a better anti-deflection effect on the distal end of the guidewire body 2.

[0070] Preferably, a guide portion 21 is provided at the distal end of the guide wire body 2, and the distal end surface of the guide portion 21 is arc-shaped. The guide portion 21 is fixed to the guide wire body 2 by welding, and the distal end of the guide portion 21 is arranged in an arc shape without edges and corners, thereby improving the flexibility of the guide wire body 2.

[0071] Preferably, a developing portion 22 is bonded to the guide wire body 2. The developing portion 22 is made of a developing material, such as a platinum-iridium alloy, platinum, etc., and is used to assist the doctor in determining the position of the front end of the guide wire body 2. The developing portion 22 is ring-shaped, and in the expanded state, after the guide wire body 2 is pulled toward the proximal end for a certain length, the developing ring contacts the inner expansion and contraction membrane 33 to prevent the guide wire conductor from slipping out toward the proximal end.

[0072] Example 2

[0073] Reference Figure 2, on the basis of Embodiment 1, this embodiment further elaborates on the structure of the communication holes 34. The communication holes 34 are annular in the radial direction of the inner structure layer 11 and extend along the axial direction of the inner structure layer 11. Here, the communication holes 34 respectively refer to the projections on the radial direction and the central axis of the inner structure layer 11. It can be understood that: in the three-dimensional structure, the communication holes 34 start from a starting point on the inner structure layer 11 and extend forward in a spring shape. The purpose of this setting is to enable the contrast agent to enter the inner cavity of the inner expansion film more uniformly along the axial length of the communication holes 34, making the distribution of the contrast agent entering the inner cavity of the inner expansion film more uniform, and the expansion of the inner expansion film more uniform, so as to fit the side wall of the guide wire body 2 with higher efficiency.

[0074] Embodiment 3

[0075] Referring to Figure 2 , on the basis of Embodiment 1, this embodiment further elaborates on the guide wire catheter 1. The proximal end of the guide wire catheter 1 is connected with a Y-shaped connection valve 4 in a Luer connection manner. One opening of the Y-shaped connection valve 4 is communicated with the inner cavity of the guide wire catheter 1 for the guide wire body 2 to pass through, and the other is communicated with the diversion sandwich layer 31 to facilitate the injection of the contrast agent.

[0076] In summary: By setting the guide wire catheter 1 with a diversion sandwich layer 31, an outer expansion and contraction film 32, and an inner expansion and contraction film 33, the present invention realizes the expansion and contraction control of the outer expansion and contraction film 32 and the inner expansion and contraction film 33 by injecting and extracting the contrast agent. After the outer expansion and contraction film 32 expands, it closely adheres to the circumference of the blood vessel wall to realize the clamping of the guide wire catheter 1. After the inner expansion and contraction film 33 expands, it abuts against the side wall of the guide wire body 2 to realize the clamping of the guide wire body 2, providing radial support for the guide wire body 2 and overcoming the problem in the prior art that the structural strength of the distal end of the guide wire is insufficient and it is likely to deviate from the original and ideal arterial lumen under the extrusion of hard plaques and enter the false lumen.

[0077] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A device for recanalizing chronic occlusion of the internal carotid artery, characterized in that, It includes a guide wire catheter (1) and a guide wire body (2) disposed inside the guide wire catheter (1); A telescopic assembly (3) is disposed on the guide wire catheter (1), and clamps the guide wire body (2) and abuts against the inner wall of the blood vessel in the expanded state; Wherein, the telescopic assembly (3) includes a diversion interlayer (31) disposed inside the side wall of the guide wire catheter (1), an outer telescopic film (32) disposed outside the distal end of the guide wire catheter (1) and communicated with the diversion interlayer (31), and an inner telescopic film (33) disposed inside the distal end of the guide wire catheter (1). A communication hole (34) is formed on the guide wire catheter (1) to communicate the inner cavity of the outer telescopic film (32) and the inner cavity of the inner telescopic film (33).

2. The opening device for chronic occlusion of the internal carotid artery according to claim 1, wherein The length of the inner telescopic film (33) along the axial direction of the guide wire catheter (1) is greater than the length of the outer telescopic film (32) along the axial direction of the guide wire catheter (1).

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

4. The recanalization device for chronic occlusion of the internal carotid artery according to claim 3, wherein The communication 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).

5. The recanalization device for chronic occlusion of the internal carotid artery according to claim 4, wherein The distal ends of the outer telescopic film (32) and the inner telescopic film (33) are flush with the distal end of the guide wire catheter (1) in the axial direction.

6. The recanalization device for chronic occlusion of the internal carotid artery according to claim 1, characterized in that, A guiding portion (21) is disposed at the distal end of the guide wire body (2), and the distal end surface of the guiding portion (21) is arc-shaped.

7. The recanalization device for chronic occlusion of the internal carotid artery according to claim 6, characterized in that, A developing portion (22) connected to the proximal end of the guiding portion (21) is disposed on the guide wire body (2).

8. The opening device for chronic occlusion of the internal carotid artery according to claim 7, wherein The developing portion (22) is a developing ring, and the developing ring is wound around the side wall of the guide wire body (2).

9. A recanalization device for chronic occlusion of the internal carotid artery according to any one of claims 1-8, characterized in that, A Y-shaped connection valve (4) is disposed at the proximal end of the guide wire catheter (1), and one branch of the Y-shaped connection valve (4) is communicated with the diversion interlayer (31).

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

Images