Guide catheter

Abstract

The utility model discloses a guiding catheter which comprises an inner tube and an outer tube movably sleeved outside the inner tube, and further comprises a self-adaptive externally-supported woven mesh tube, the self-adaptive externally-supported woven mesh tube comprises a fixed end and a movable end, and the outer tube comprises a driving end close to one end of the self-adaptive externally-supported woven mesh tube. The moving end of the self-adaptive externally-supported woven mesh pipe is fixedly connected with the driving end, and the fixed end of the self-adaptive externally-supported woven mesh pipe is fixedly connected with the front end of the inner pipe; the outer pipe can slide relative to the inner pipe to drive the driving end to drive the moving end to be close to or far away from the fixed end, so that the self-adaptive externally-supported woven mesh pipe is switched between a straightening state and an externally-supported state. The self-adaptive external-supporting woven mesh pipe has the advantages that the external-supporting expanding diameter and supporting performance can be adjusted, the self-adaptive external-supporting woven mesh pipe is suitable for positioning blood vessels with different diameters, operation is convenient, the surgical operation difficulty and risk are reduced, and the neutral property is high after a guiding catheter penetrates into the blood vessels.

Description

Technical Field

[0001] This utility model relates to the field of medical catheter technology, and in particular to a guiding catheter. Background Technology

[0002] With the improvement of living standards and changes in dietary habits, the incidence of cardiovascular diseases such as coronary heart disease is constantly increasing, leading to an increase in the number of cardiovascular disease patients. Guiding catheters are medical devices widely used in interventional procedures, especially for cardiovascular interventional procedures. They are mainly used to provide a stable pathway for interventional devices (such as guidewires, balloon catheters, stent delivery systems, etc.) and guide these devices to the target lesion site.

[0003] For example, in percutaneous coronary intervention (PCI) procedures, a guiding catheter is inserted into the blood vessel opening (such as the radial or femoral artery) and extends along the vessel to the coronary artery ostium, establishing a pathway for subsequent procedures and ensuring that surgical instruments can be accurately placed at the location of coronary artery stenosis or lesions. Throughout the procedure, the guiding catheter, as the primary delivery route, significantly impacts the efficiency and success rate of the entire procedure due to its positioning and support capabilities. Taking coronary artery stent implantation as an example, the guidewire needs to be inserted into the coronary artery through the guiding catheter and traverse the stenotic lesion area; the shape and position of the guiding catheter help the surgeon precisely manipulate the guidewire, ensuring it follows the correct vascular path.

[0004] However, existing guiding catheters have the following drawbacks:

[0005] 1. Insufficient Support: In complex vascular interventional procedures, such as the treatment of chronic total occlusion (CTO), strong and stable support is required from the guiding catheter. However, the vascular structures of different patients vary greatly, including vessel diameter, length, and curvature. Currently, the market offers dozens of different complex shapes of guiding catheters to accommodate different vascular structures (for example, Cordis, a globally best-selling company, offers 6 different sizes and 87 different bend designs) to ensure effective support under various vascular structures. This poses significant inconvenience and difficulties for the selection of guiding catheters in clinical surgery. In particular, when it is found during surgery that the selected guiding catheter is unsuitable and a new structure is required, the catheter replacement process can be complex and may easily cause critical complications such as vasospasm, injury, or air embolism, significantly increasing the operation time and affecting the emergency response.

[0006] 2. Poor centering: Clinically, keeping the tip of the guiding catheter centered in the blood vessel facilitates instrument insertion and reduces contact between the instrument and the vessel wall, thus minimizing vessel wall damage and the occurrence of vascular dissection. However, in actual use, due to gravity, the tip of the guiding catheter is usually close to the vessel wall. This significantly increases the likelihood of contact between the interventional device and the vessel wall, potentially causing instrument damage to the vessel wall, leading to vascular wall injury and vascular dissection, and triggering serious complications. Utility Model Content

[0007] The purpose of this invention is to provide a guiding catheter that has the following characteristics: the external braided mesh tube has an adjustable expansion diameter and support; it is suitable for positioning blood vessels of different diameters; it is easy to operate, reducing the difficulty and risk of surgical procedures; and it has a high degree of centering after the guiding catheter is inserted into the blood vessel.

[0008] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a guiding conduit, including an inner tube, an outer tube movably sleeved outside the inner tube, and an adaptive external braided mesh tube, wherein the adaptive external braided mesh tube includes a fixed end and a movable end, the outer tube includes a driving end near one end of the adaptive external braided mesh tube, the movable end of the adaptive external braided mesh tube is fixedly connected to the driving end, and the fixed end of the adaptive external braided mesh tube is fixedly connected to the front end of the inner tube;

[0009] The outer tube can slide relative to the inner tube, driving the driving end to move the moving end closer to or away from the fixed end, so that the adaptive external braided mesh tube can switch between a straightened state and an externally supported state.

[0010] By adopting the above technical solution, before the guiding catheter is implanted into the human body, the moving end of the adaptive external braided mesh tube is ensured to be in a position relatively far from the fixed end, so that the adaptive external braided mesh tube is in a straightened state. This ensures that the overall outer diameter of the guiding catheter is uniform, facilitating the smooth implantation of the guiding catheter through the blood vessel into the human body. Using the straightened adaptive external braided mesh tube as the implantation end, the guiding catheter is implanted near the lesion location. When the tip of the guiding catheter reaches the vicinity of the lesion location, the inner tube remains stationary while the outer tube is pushed to slide relative to the inner tube, causing the moving end of the adaptive external braided mesh tube to gradually approach the fixed end. This causes the adaptive external braided mesh tube to expand radially outward. When the catheter is expanded outward to the predetermined diameter, its radially unfolded sidewalls abut against the inner wall of the blood vessel for positioning, keeping the inner and outer tubes relatively stationary. The interventional instrument is then inserted through the inner tube to the lesion site for treatment. After the procedure, the outer tube is pulled outward, moving its moving end away from the fixed end. The adaptive external braided mesh tube is stretched to a straight state, releasing its positioning from the inner wall of the blood vessel. The entire guiding catheter is then withdrawn from the blood vessel. This invention, by setting an adaptive external braided mesh tube at the tip of the guiding catheter and controlling the sliding of the outer tube relative to the inner tube, achieves the switching between a straightened and expanded state of the adaptive external braided mesh tube. The guiding catheter's tip can be positioned against the vessel wall near the corresponding lesion location via an adaptive external braided mesh tube in an externally supported state. This reduces the impact of blood flow or the reaction force generated by pulling on the guiding catheter during surgery, which could cause displacement or deformation. Furthermore, the external expansion diameter of the adaptive external braided mesh tube can be adjusted by regulating the distance between the moving and fixed ends, thus adapting to vessels of different inner diameters for positioning. This significantly increases the versatility of the guiding catheter, allowing it to be compatible with positioning vessels of varying diameters. This eliminates the need for surgeons to spend considerable time selecting the correct guiding catheter size and greatly reduces the frequency of catheter changes during surgery. This invention reduces safety risks during surgery and allows hospitals to reduce the inventory of guiding catheters, saving medical costs. During surgery, the adaptive external braided mesh tube expands centrally within the blood vessel and is fixed at the lesion site, with the inner tube also fixed in position. The high concentricity of the adaptive external braided mesh tube and the inner tube ensures that the guiding catheter is also centered in the blood vessel, facilitating instrument insertion. At the same time, it significantly reduces the possibility of contact between instruments and the blood vessel wall, thereby preventing instruments from scratching the blood vessel wall. This invention offers the advantages of adjustable external braided mesh tube expansion diameter and support, suitability for positioning blood vessels of different diameters, convenient operation reducing surgical difficulty and risk, and high centrality of the guiding catheter after insertion into the blood vessel.

[0011] A further feature of this invention is that the adaptive external support braided mesh tube is formed by three-dimensional weaving of several tough metal fiber filaments.

[0012] By adopting the above technical solution, metal has extremely strong imaging properties, and the self-adaptive external braided mesh tube made of three-dimensional metal fiber filaments has strong imaging properties, which helps doctors determine the insertion position of the guiding catheter in the blood vessel.

[0013] A further feature of this invention is that the number of concentric braiding layers of the adaptive external braided mesh tube is set to at least one layer.

[0014] By adopting the above technical solutions, the single-layer adaptive external braided mesh tube is thinner and more flexible, making it suitable for supporting and positioning thin blood vessel walls. The multi-layer adaptive external braided mesh tube has stronger support performance and is suitable for supporting and positioning blood vessel walls with larger inner diameters and thicker walls.

[0015] A further feature of this invention is that the number of braided strands of the metal fiber filaments in each layer of the adaptive external braided mesh tube is set between 2 and 128, the braiding density is set between 1 and 100 PPI, and the diameter of each metal fiber filament is controlled between 0.01 and 10 mm.

[0016] A further feature of this invention is that the straightening length of the adaptive external support braided mesh tube in the straightened state is controlled between 40-60mm, and the outer support unfolding diameter of the adaptive external support braided mesh tube in the external support state is controlled between 30-40mm.

[0017] A further feature of this invention is that at least one connection between the mobile end and the driving end, and between the fixed end and the front end of the inner tube, is fixedly connected by a metal ring.

[0018] By adopting the above technical solution, the metal ring has extremely strong imaging performance, and the method of fixing with a metal ring is conducive to improving the doctor's accurate judgment of the insertion position of the guiding catheter.

[0019] A further feature of this invention is that the moving end is fixedly connected to the driving end by one of the following methods: welding, fusion, or bonding; and / or, the fixed end is fixedly connected to the front end of the inner tube by one of the following methods: welding, fusion, or bonding.

[0020] A further feature of this invention is that a locking structure is provided between the outer tube and the inner tube, and the locking structure can control the switching between the inner tube and the outer tube in a locked state and an unlocked state.

[0021] By adopting the above technical solution, when the adaptive external braided mesh tube is in a straightened state or an externally supported state, the inner tube and the outer tube can be locked and fixed by a locking structure, so that the inner tube and the outer tube remain relatively fixed and prevent the inner tube and the outer tube from sliding against each other, thereby keeping the adaptive external braided mesh tube in a straightened state or the corresponding externally supported state.

[0022] A further feature of this invention is that the locking structure includes a positioning seat, a screwing sleeve, an annular pressure block, and a rubber tube. The positioning seat has a channel extending through it along the axial direction. One end of the outer tube is fixedly connected to the positioning seat, so that the cavity of the outer tube communicates with the channel. The rubber tube is connected to the outer tube. The positioning seat is threadedly connected to the screwing sleeve. The screwing sleeve is provided with a pressing part. The annular pressure block and the rubber tube are coaxially inserted in the channel. The pressing part presses against the annular pressure block and drives the rubber tube to undergo elastic deformation radially inward.

[0023] By adopting the above technical solution, rotating the screw sleeve drives the pressing part to approach or move away from the annular pressure block. When the pressing part presses the annular pressure block, the annular pressure block will press down on the hose. At this time, because the hose is restricted by the inner wall of the channel of the positioning seat, the hose can only undergo radial elastic deformation inward after being squeezed, thereby pressing the outer tube to make it press against the inner tube and lock it. When the pressing part moves away from the annular pressure block, the pressing force of the annular pressure block on the hose disappears, and the hose uses its own elastic restoring force to axially reset, so that the inner tube and the outer tube are released from the tight state and separated from each other. In this way, this utility model can achieve the locking between the outer tube and the inner tube by rotating the screw sleeve and using the annular pressure block to press the hose inward to deform it.

[0024] A further feature of this invention is that: a control base is provided at one end of the inner tube away from the adaptive external braided mesh tube, and the control base is provided with a hemostatic valve connected to the tail end of the inner tube.

[0025] By adopting the above technical solution, the control base makes it convenient for doctors to rotate or push and pull the inner tube, and the addition of the hemostatic valve can prevent blood from flowing out of the body through the lumen of the inner tube.

[0026] In summary, this utility model has the following beneficial effects:

[0027] 1. This method involves movably sleeved an outer tube over an inner tube. The fixed end of the adaptive external braided mesh tube is fixedly connected to the front end of the inner tube via a metal ring, while the movable end of the adaptive external braided mesh tube is fixedly connected to the driving end of the outer tube via another metal ring. The outer tube can slide relative to the inner tube, driving the driving end to move the movable end closer to or away from the fixed end. This allows the adaptive external braided mesh tube to switch between a straightened state and an externally extended state. Simultaneously, by adjusting the distance between the movable end and the fixed end, the external extension diameter of the adaptive external braided mesh tube can be adjusted to adapt to blood vessels of different inner diameters for positioning. This eliminates the need for doctors to spend a lot of time selecting the guide catheter specifications, greatly reduces the number of times guide catheters need to be changed during surgery, reduces safety risks during surgery, and allows hospitals to reduce the inventory of guide catheters, saving medical costs.

[0028] 2. The metal rings have strong radiopaque properties, allowing doctors to determine the insertion position of the guiding catheter within the blood vessel, greatly enhancing visibility during surgery. Furthermore, in this invention, both ends of the adaptive external braided mesh tube are fixed with metal rings, enabling the reading of the distance between the moving and fixed ends of the adaptive external braided mesh tube inserted into the blood vessel, thus accurately determining the external release diameter of the adaptive external braided mesh tube. The adaptive external braided mesh tube is fixedly connected to the inner and outer tubes via corresponding metal rings, maintaining a high degree of concentricity between the adaptive external braided mesh tube and the inner tube. During surgery, the adaptive external braided mesh tube is centered and fixed at the lesion site within the blood vessel, and the position of the inner tube is also fixed accordingly. The high concentricity between the adaptive external braided mesh tube and the inner tube ensures that the guiding catheter is also centered within the blood vessel, facilitating instrument insertion while significantly reducing the possibility of contact between the instrument and the blood vessel wall, thereby preventing the instrument from scratching the blood vessel wall. Attached Figure Description

[0029] Figure 1 This is the overall structural diagram of the present invention, showing the adaptive external braided mesh tube in a straightened state.

[0030] Figure 2 This is a partial view of the adaptive external support braided mesh tube of this utility model in the external support state.

[0031] Figure 3 This is a cross-sectional view of the positioning seat with the outer tube installed in this utility model, separated from the screw cap.

[0032] Figure 4 This is an exploded view of the locking structure of this utility model.

[0033] Figure 5 This is a cross-sectional view of the control base of this utility model.

[0034] In the diagram: 1. Inner tube; 11. Control base; 111. Hemostatic valve; 112. Limit buckle; 2. Outer tube; 21. Drive end; 3. Adaptive external braided mesh tube; 30. Metal fiber filament; 31. Fixed end; 32. Moving end; 33. Mesh; 4. Metal ring; 51. Positioning seat; 511. Channel; 52. Twisting sleeve; 521. Pressing part; 53. Annular pressure block; 54. Rubber tube. Detailed Implementation

[0035] The present invention will be further described below with reference to the accompanying drawings.

[0036] A guiding catheter, such as Figure 1-2 As shown, it includes an inner tube 1, an outer tube 2 movably sleeved outside the inner tube 1, and an adaptive external braided mesh tube 3. The adaptive external braided mesh tube 3 includes a fixed end 31 and a movable end 32. The outer tube 2 includes a driving end 21 near one end of the adaptive external braided mesh tube 3. The movable end 32 of the adaptive external braided mesh tube 3 is fixedly connected to the driving end 21. The fixed end 31 of the adaptive external braided mesh tube 3 is fixedly connected to the front end of the inner tube 1. The outer tube 2 can slide relative to the inner tube 1, driving the driving end 21 to move the movable end 32 closer to or away from the fixed end 31, so that the adaptive external braided mesh tube 3 switches between a straightened state and an externally supported state. When the adaptive external braided mesh tube 3 is in the externally supported state, a hollow mesh 33 is formed on the surface of the adaptive external braided mesh tube 3.

[0037] like Figure 2As shown, the adaptive external support braided mesh tube 3 is formed by three-dimensional weaving of several tough metal fibers 30. Metal has extremely strong imaging properties, and the adaptive external support braided mesh tube 3, made of three-dimensionally woven metal fibers 30, has strong imaging properties, which is helpful for doctors to determine the insertion position of the guiding catheter in the blood vessel. In this embodiment, the number of concentric braiding layers of the adaptive external support braided mesh tube 3 is set to one. The single-layer adaptive external support braided mesh tube 3 is thinner and has better flexibility, making it suitable for supporting and positioning thin blood vessel walls. In other embodiments, the number of concentric braiding layers of the adaptive external support braided mesh tube 3 can be set to at least two. The multi-layer adaptive external support braided mesh tube 3 has stronger support performance and is suitable for supporting and positioning blood vessel walls with larger inner diameters and thicker walls. The number of braided strands of the metal fibers 30 in each layer of the adaptive external support braided mesh tube 3 is set between 2 and 128, the braiding density is set between 1 and 100 PPI, and the straightness of each metal fiber 30 is... The diameter is controlled between 0.01-10mm; the straightened length of the adaptive external braided mesh tube 3 in the straightened state is controlled between 40-60mm, and the outward expansion diameter of the adaptive external braided mesh tube 3 in the outward expansion state is controlled between 30-40mm; the moving end 32 and the driving end 21, and the fixed end 31 and the front end of the inner tube 1 are all fixedly connected by a metal ring 4. The metal ring 4 has extremely strong imaging performance. The method of fixing with the metal ring 4 is conducive to improving the doctor's accurate judgment of the insertion position of the guiding catheter; the fixing method of the corresponding metal ring 4 between the moving end 32 and the driving end 21, and between the fixed end 31 and the front end of the inner tube 1 is one of welding, fusion or bonding. In this embodiment, the metal ring 4 is fixed by welding; in actual production, the guiding catheter is designed with 4 external dimensions and 2 specifications of fixing devices, for a total of 8 specifications of guiding catheters to cover all patients' surgical needs.

[0038] like Figure 1 and Figure 3-5As shown, a locking structure is provided between the tail of the inner tube 1 and the outer tube 2. The locking structure can control the switching between the locked and unlocked states of the inner tube 1 and the outer tube 2. When the adaptive external braided mesh tube 3 is in the straightened or externally supported state, the inner tube 1 and the outer tube 2 can be locked and fixed by the locking structure, so that the inner tube 1 and the outer tube 2 remain relatively fixed and prevent the inner tube 1 and the outer tube 2 from sliding against each other. Thus, the adaptive external braided mesh tube is kept in the straightened state or the corresponding externally supported state. The locking structure includes a positioning seat 51, a screwing sleeve 52, an annular pressure block 53 and a rubber tube 54. The positioning seat 51 A channel 511 is provided axially. One end of the outer tube 2 is fixedly connected to the positioning seat 51, so that the cavity of the outer tube 2 communicates with the channel 511. The rubber tube 54 is fixedly connected to the outer tube 2. The positioning seat 51 is threadedly connected to the screw sleeve 52. The screw sleeve 52 is provided with a pressing part 521. The annular pressure block 53 and the rubber tube 54 are coaxially inserted in the channel 511. The pressing part 521 presses against the annular pressure block 53, causing the rubber tube 54 to undergo elastic deformation radially inward. Rotating the screw sleeve 52 causes the pressing part 521 to move closer to or away from the annular pressure block 53. When the pressing part 521 presses against the annular pressure block 53, the annular pressure block 53... The hose 54 is pressed down. Because the hose 54 is restricted by the inner wall of the channel 511 of the positioning seat 51, it can only undergo radial elastic deformation inwards after being squeezed. This presses down on the outer tube 2, causing it to press inwards and lock against the inner tube 1. When the pressing part 521 moves away from the annular pressure block 53, the pressing force of the annular pressure block 53 on the hose 54 disappears. The hose 54 then uses its own elastic restoring force to axially reset, causing the inner tube 1 and outer tube 2 to release from their clamping state and separate. Thus, this invention allows the hose 54 to be pressed inwards by rotating the screw sleeve 52 and using the annular pressure block 53. Deformation achieves locking between the outer tube 2 and the inner tube 1; the end of the inner tube 1 away from the adaptive external braided mesh tube 3 is provided with a control base 11, and the control base 11 is provided with a hemostatic valve 111 connected to the tail end of the inner tube 1. The control base 11 facilitates the doctor to rotate or push and pull the inner tube 1. The addition of the hemostatic valve 111 can prevent blood from flowing out of the body through the lumen of the inner tube 1; the outer wall of the control base 11 is provided with a limiting buckle 112, which can limit the forward and backward movement distance between the outer tube 2 and the inner tube 1, and prevent surgical risks caused by excessive relative slippage between the outer tube 2 and the inner tube 1.

[0039] The basic working principle of this utility model is as follows: Before the guiding catheter is implanted into the human body, the movable end 32 of the adaptive external braided mesh tube 3 is kept relatively far away from the fixed end 31, so that the adaptive external braided mesh tube 3 is in a straightened state to ensure that the overall outer diameter of the guiding catheter is uniform. At the same time, the locking structure is controlled to be in a locked state, so that the outer tube 2 and the inner tube 1 are locked together, preventing the outer tube 2 from slipping relative to the inner tube 1 when the guiding catheter is implanted into the human body, which would cause the adaptive external braided mesh tube 3 to be accidentally opened. This facilitates the smooth implantation of the guiding catheter into the human body through the blood vessel. Using the adaptive external braided mesh tube 3 in a straightened state as the implantation end, the guiding catheter is implanted near the lesion site in the human body. When the guiding catheter tip reaches the vicinity of the lesion, the locking structure is switched to the unlocked state. At this time, the outer tube 2 can slide freely relative to the inner tube 1. By keeping the inner tube 1 stationary and simultaneously pushing the outer tube 2 to slide relative to the inner tube 1, the moving end 32 of the adaptive external braided mesh tube 3 gradually approaches the fixed end 31, thereby causing the adaptive external braided mesh tube 3 to expand radially outward. When the adaptive external braided mesh tube 3 expands outward to the predetermined diameter, the locking structure is switched to the locked state. The radially expanded sidewall of the adaptive external braided mesh tube 3 abuts against the inner wall of the blood vessel to achieve positioning, keeping the locking structure in the locked state. Then, the interventional instrument is introduced into the lesion site through the inner tube 1 for treatment. After the procedure is completed... Switching the locking structure to the unlocked state, and pulling the outer tube 2 outward, the moving end 32 of the outer tube 2 is moved away from the fixed end 31, stretching the adaptive external braided mesh tube 3 to a straight state, thus releasing the adaptive external braided mesh tube 3 from the inner wall of the blood vessel. Then, switching the locking structure to the locked state, and then pulling the entire guiding catheter outward from the human blood vessel. This utility model, by setting the adaptive external braided mesh tube 3 at the front end of the guiding catheter, and controlling the sliding of the outer tube 2 relative to the inner tube 1, realizes the switching between the straightened state and the external braided mesh tube 3, so that the front end of the guiding catheter can be pressed against the blood vessel near the corresponding lesion location by the adaptive external braided mesh tube 3 in the external braided state. Positioning is achieved on the wall, thereby reducing the impact of blood flow or the reaction force generated by pulling the guiding catheter during the operation, which could cause the guiding catheter to shift or deform. At the same time, the outer expansion diameter of the adaptive outer braided mesh tube 3 can be adjusted by adjusting the distance between the moving end 32 and the fixed end 31, thus adapting to the positioning of blood vessels with different inner diameters. This greatly increases the versatility of the guiding catheter, making it compatible with positioning blood vessels of different diameters. Doctors do not need to spend a lot of time selecting the specifications of the guiding catheter, and the number of times the guiding catheter needs to be changed during the operation is greatly reduced, reducing the safety risks during the operation. Hospitals can also reduce the inventory of guiding catheters and save medical costs.Furthermore, the adaptive external braided mesh tube 3, woven from metal fibers 30, possesses a certain imaging function, while the metal rings 4 exhibit strong imaging properties. Doctors can determine the insertion position of the guiding catheter within the blood vessel by observing the position of the metal rings 4, greatly enhancing visibility during the procedure. Additionally, in this invention, both ends of the adaptive external braided mesh tube 3 are fixed with metal rings 4, allowing for the reading of the distance between the moving end 32 and the fixed end 31 of the adaptive external braided mesh tube 3 inserted into the blood vessel, thereby accurately determining the external release diameter of the adaptive external braided mesh tube 3. The adaptive external braided mesh tube 3 is fixedly connected to the inner tube 1 and outer tube 2 via corresponding metal rings 4, ensuring the connection between the adaptive external braided mesh tube 3 and the inner tube... 1. Maintaining high concentricity: During the procedure, the adaptive external braided mesh tube 3 expands centrally within the blood vessel and is fixed at the lesion site. The inner tube 1 is also fixed in position. The high concentricity between the adaptive external braided mesh tube 3 and the inner tube 1 ensures that the guiding catheter is also centered within the blood vessel, facilitating instrument insertion. Simultaneously, it significantly reduces the possibility of contact between the instrument and the blood vessel wall, thus preventing instrument abrasion of the blood vessel wall. This invention offers the following advantages: adjustable expansion diameter and support of the adaptive external braided mesh tube 3; suitability for positioning blood vessels of different diameters; convenient operation reducing surgical difficulty and risk; high centrality of the guiding catheter after insertion into the blood vessel; and improved imaging, facilitating accurate judgment of the guiding catheter implantation position by the surgeon.

[0040] The above description is only a preferred embodiment of the present utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model patent application are included in the scope of the present utility model patent application.

Claims

1. A guiding catheter, comprising an inner tube (1) and an outer tube (2) movably sleeved outside the inner tube (1), characterized in that: It also includes an adaptive external braided mesh tube (3), which includes a fixed end (31) and a movable end (32). The outer tube (2) includes a driving end (21) near one end of the adaptive external braided mesh tube (3). The movable end (32) of the adaptive external braided mesh tube (3) is fixedly connected to the driving end (21). The fixed end (31) of the adaptive external braided mesh tube (3) is fixedly connected to the front end of the inner tube (1). The outer tube (2) can slide relative to the inner tube (1), driving the driving end (21) to move the moving end (32) closer to or away from the fixed end (31), so that the adaptive external braided mesh tube (3) can switch between the straightened state and the external braided state.

2. The guiding catheter according to claim 1, characterized in that: The adaptive external braided mesh tube (3) is formed by three-dimensional weaving of several tough metal fiber filaments (30).

3. A guiding catheter according to claim 1, characterized in that: The number of concentric braided layers of the adaptive external braided mesh tube (3) is set to at least one.

4. A guiding catheter according to claim 1, characterized in that: The number of braided strands of the metal fiber filaments (30) in each layer of the adaptive external braided mesh tube (3) is set between 2 and 128, the braiding density is set between 1 and 100 PPI, and the diameter of each metal fiber filament (30) is controlled between 0.01 and 10 mm.

5. A guiding catheter according to claim 1, characterized in that: The straightening length of the adaptive external braided mesh tube (3) in the straightened state is controlled between 40-60mm, and the external expansion diameter of the adaptive external braided mesh tube (3) in the external support state is controlled between 30-40mm.

6. A guiding catheter according to claim 1, characterized in that: At least one of the points between the mobile end (32) and the driving end (21), and between the fixed end (31) and the front end of the inner tube (1), is fixedly connected by a metal ring (4).

7. A guiding catheter according to claim 1, characterized in that: The metal ring (4) fixes the moving end (32) to the driving end (21) by one of welding, fusion or bonding, and / or the metal ring (4) fixes the fixed end (31) to the front end of the inner tube (1) by one of welding, fusion or bonding.

8. A guiding catheter according to claim 1, characterized in that: A locking structure is provided between the outer tube (2) and the inner tube (1), and the locking structure can control the switching between the inner tube (1) and the outer tube (2) in a locked state and an unlocked state.

9. A guiding catheter according to claim 8, characterized in that: The locking structure includes a positioning seat (51), a screw sleeve (52), an annular pressure block (53), and a rubber tube (54). The positioning seat (51) has a channel (511) extending through it axially. One end of the outer tube (2) is fixedly connected to the positioning seat (51), so that the cavity of the outer tube (2) is connected to the channel (511). The rubber tube (54) is connected to the outer tube (2). The positioning seat (51) is threadedly connected to the screw sleeve (52). The screw sleeve (52) is provided with a pressing part (521). The annular pressure block (53) and the rubber tube (54) are coaxially inserted in the channel (511). The pressing part (521) presses and cooperates with the annular pressure block (53), and drives the rubber tube (54) to undergo elastic deformation radially inward.

10. A guiding catheter according to claim 1, characterized in that: The inner tube (1) is provided with a control base (11) at one end away from the adaptive external braided mesh tube (3), and the control base (11) is provided with a hemostatic valve (111) connected to the tail end of the inner tube (1).

Images