Guiding catheter with adjustable supporting performance

Abstract

The invention discloses a supporting-adjustable guiding catheter which comprises an inner tube and an outer tube movably arranged outside the inner tube in a sleeving mode 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 movable end is fixedly connected with the driving end through a corresponding metal ring; the fixed end is fixedly connected with the front end of the inner pipe through a corresponding metal ring; 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 an externally-supported state and a straightened state. The self-adaptive externally-supported woven mesh tube is adjustable in externally-supported expanding diameter and supporting performance, is suitable for positioning blood vessels with different diameters, is convenient to operate, reduces the difficulty and risk of surgical operation, is high in centrality after penetrating into the blood vessels, improves the developing performance, and is beneficial for a doctor to accurately judge the placement position of the guiding catheter.

Description

Technical Field

[0001] The invention relates to the technical field of medical catheters, and in particular to a guiding catheter with adjustable support. Background Art

[0002] With the improvement of living standards and changes in eating habits, the incidence of cardiovascular diseases such as coronary heart disease continues to increase, leading to a surge in the number of patients with cardiovascular diseases, which has led to a continuous increase in the demand for vascular interventional treatment and an increase in the number of various vascular interventional surgeries. As an important instrument in vascular interventional surgery, the market demand for guide catheters has also increased. In addition to the common percutaneous coronary intervention, interventional surgeries in peripheral vascular, neurovascular and other fields are also gradually becoming popular, which has brought a broad market space for guide catheters. As a medical device widely used in interventional surgery, especially for cardiovascular interventional surgery, the guide catheter is mainly used to provide a stable pathway for interventional instruments (such as guidewires, balloon catheters, stent delivery systems, etc.) to guide these instruments to the target lesion site. For example, in percutaneous coronary intervention, the guide catheter is inserted from the entrance of the blood vessel (such as the radial artery or femoral artery) and extends along the blood vessel to the opening of the coronary artery, establishing a channel for subsequent operations to ensure that the surgical instruments can be accurately placed at the location of coronary artery stenosis or lesions. During the entire operation, the guide catheter is the most front-end delivery pathway, and its positioning and support performance affect the efficiency and success rate of the entire operation. Taking coronary stent implantation surgery as an example, the guidewire needs to enter the coronary artery through the guiding catheter and pass through the narrowed lesion area. The shape and position of the guiding catheter can help the doctor accurately control the guidewire to ensure that it moves along the correct vascular path.

[0003] According to the application site, they can be divided into coronary artery guidance catheters, peripheral vascular guidance catheters and neurovascular guidance catheters. Among them, coronary artery guidance catheters are specially used for coronary artery interventional surgery, and their design features are that they can adapt to the small diameter and complex branch structure of the coronary artery; peripheral vascular guidance catheters are used for interventional treatment of peripheral blood vessels (such as the carotid artery, femoral artery, renal artery, etc.), and the diameter and length of peripheral blood vessels vary greatly, so the size and length specifications of peripheral vascular guidance catheters are more diverse; neurovascular guidance catheters are mainly used for cerebrovascular interventional surgery, such as embolization treatment of intracranial aneurysms, stent implantation for carotid artery stenosis, etc.

[0004] However, the existing guiding catheters have the following defects: 1. Insufficient support: In complex vascular interventional surgeries, such as interventional treatment of chronic total occlusion (CTO), the guide catheter is required to provide strong and stable support. However, the vascular structures of different patients vary greatly, including vascular diameter, length, degree of curvature, etc. In order to cope with different vascular structures, there are currently dozens of different complex shapes of guide catheters on the market (taking the globally popular Cordis product as an example, there are 6 sizes and 87 curved structures of guide catheters) to ensure effective support under different vascular structures, which brings a lot of inconvenience and difficulties to the selection of guide catheters for clinical surgery. In particular, when it is found during surgery that the selected guide catheter is inappropriate and a guide catheter with a new structure needs to be replaced, the exchange process of the guide catheter is relatively complicated, which can easily cause critical complications such as vascular spasm, injury or air embolism, and will greatly increase the operation time and affect the emergency treatment effect; 2. Poor centering: Clinically, if the tip of the guiding catheter is kept in the center of the blood vessel, it is conducive to the penetration of the instrument and reduces the contact between the instrument and the blood vessel wall, reducing the occurrence of blood vessel wall damage and vascular dissection. However, in actual use, due to the effect of gravity, the tip of the guiding catheter is usually close to the blood vessel wall, which greatly increases the contact probability between the interventional instrument and the blood vessel wall, which may cause the instrument to damage the blood vessel wall, leading to blood vessel wall damage and vascular dissection, causing serious complications; 3. Poor visibility: During the operation, the doctor needs to clearly understand the position and status of the guide catheter. The markings on some guide catheters are not clear or do not have good visualization, which makes it difficult for the doctor to accurately judge whether the guide catheter has reached the target position, especially at vascular bifurcations or complex vascular anatomical structures. This increases the difficulty and uncertainty of the surgical operation. Summary of the invention

[0005] The purpose of the present invention is to provide a guiding catheter with adjustable support, which has an adaptive outer support braided mesh tube, an outer support expansion diameter and adjustable support, is suitable for positioning blood vessels of different diameters, is easy to operate and reduces the difficulty and risk of surgical operations, has high centrality after the guiding catheter penetrates the blood vessel, and improves the visualization, which helps the doctor to accurately judge the insertion position of the guiding catheter.

[0006] The above technical purpose of the present invention is achieved through the following technical solutions: a supportive and adjustable guiding catheter, comprising an inner tube, an outer tube movably mounted outside the inner tube, and an adaptive external supporting braided mesh tube, the adaptive external supporting braided mesh tube comprising a fixed end and a movable end, the outer tube comprising a driving end close to one end of the adaptive external supporting braided mesh tube, the movable end and the driving end, the fixed end and the front end of the inner tube are fixedly connected by corresponding metal rings; the outer tube can slide relative to the inner tube, driving the driving end to drive the mobile end close to or away from the fixed end, so that the adaptive external supporting braided mesh tube can be switched between an external supporting state and a straightened state, and when the adaptive external supporting braided mesh tube is in the external supporting state, mesh holes are formed on the surface of the adaptive external supporting braided mesh tube.

[0007] By adopting the above technical solution, before the guiding catheter is placed in the predetermined position, it is ensured that the moving end of the adaptive outer support braided mesh tube is in a position relatively far away from the fixed end, so that the adaptive outer support braided mesh tube is in a straightened state, so as to ensure that the outer diameter of the guiding catheter as a whole is uniform, so as to facilitate the smooth placement of the guiding catheter through the blood vessel into the predetermined position, and the guiding catheter is placed and pushed to the vicinity of the predetermined position with the adaptive outer support braided mesh tube in the straightened state as the placement end. When the front end of the guiding catheter reaches the vicinity of the predetermined position, the inner tube is kept stationary, and the outer tube is pushed to slide relative to the inner tube, so that the moving end of the adaptive outer support braided mesh tube gradually approaches the fixed end, thereby making the adaptive outer The braided mesh tube is radially expanded outwards. When the adaptive outer braided mesh tube is expanded outwards to a predetermined diameter, the radially expanded side walls of the adaptive outer braided mesh tube are used to abut against the inner wall of the blood vessel to achieve positioning, keep the inner tube and the outer tube relatively still, and then guide the interventional instrument to the predetermined position through the inner tube for treatment. When the operation is completed, the outer tube is pulled outwards to make the moving end of the outer tube away from the fixed end, the adaptive outer braided mesh tube is stretched to a straightened state, the adaptive outer braided mesh tube is released from the inner wall of the blood vessel, and then the guiding catheter is pulled outwards as a whole from the blood vessel. The present invention arranges an adaptive outer braided mesh tube at the front end of the guiding catheter, and controls the outer tube to slide relative to the inner tube. The adaptive external support braided mesh tube can be switched between the straightened state and the external support state, so that the front end of the guiding catheter can be pressed against the blood vessel wall at the corresponding predetermined position by the adaptive external support braided mesh tube in the external support state to achieve positioning, thereby reducing the blood flow impulse during the operation or the reaction force generated by pulling the guiding catheter to cause the guiding catheter to shift or deform. At the same time, the external support expansion diameter of the adaptive external support braided mesh tube can be adjusted by adjusting the distance between the mobile end and the fixed end, so as to adapt to blood vessels with different inner diameters for positioning, which greatly increases the versatility of the guiding catheter, so that the present invention can be compatible with blood vessels with different diameters for positioning, allowing Doctors do not need to spend a lot of time selecting the specifications of the guide catheter, and the number of times the guide catheter is replaced during the operation is greatly reduced, thereby reducing safety hazards during the operation. Hospitals can also reduce the inventory of guide catheters and save medical costs. At the same time, the metal ring has a strong visualization property, and doctors can judge the insertion position of the guide catheter in the blood vessel by the position of the metal ring, which greatly enhances the visibility during the operation. In addition, the front and rear ends of the adaptive external support braided mesh tube in the present invention are fixed with metal rings, so the distance between the mobile end and the fixed end of the adaptive external support braided mesh tube inserted into the blood vessel can be read, thereby accurately judging the external support release diameter of the adaptive external support braided mesh tube.The adaptive outer braided mesh tube is fixedly connected to the inner tube and the outer tube through corresponding metal rings, so that the adaptive outer braided mesh tube and the inner tube maintain a high concentricity. During the operation, the adaptive outer braided mesh tube is centrally opened in the blood vessel and fixed at the lesion position, and the position of the inner tube is also fixed accordingly. The high concentricity of the adaptive outer braided mesh tube and the inner tube ensures that the guide catheter is also in the center of the blood vessel, which is conducive to the penetration of the instrument. At the same time, the possibility of contact between the instrument and the blood vessel wall is greatly reduced, thereby preventing the instrument from scratching the blood vessel wall. The invention has the effects of adjustable outer support expansion diameter and support of the adaptive outer braided mesh tube, suitable for positioning blood vessels of different diameters, convenient operation, reduced difficulty and risk of surgical operation, high centrality of the guide catheter after it penetrates the blood vessel, and improved visualization, which is conducive to the doctor's accurate judgment of the insertion position of the guide catheter. ;

[0008] The present invention is further configured as follows: the self-adaptive external support braided mesh tube is formed by three-dimensionally braiding a plurality of tough metal fiber filaments.

[0009] By adopting the above technical solution, the metal has extremely strong development performance, and the adaptive external support braided mesh tube made of metal fiber filaments three-dimensionally woven has strong development performance, which is helpful for doctors to judge the insertion position of the guide catheter in the blood vessel.

[0010] The present invention is further configured as follows: the number of concentric braided layers of the adaptive external support braided mesh tube is set to at least one layer.

[0011] By adopting the above technical solution, the single-layer adaptive external support braided mesh tube is thinner and has better flexibility, which is suitable for supporting and positioning thin blood vessel walls. The multi-layer adaptive external support braided mesh tube has stronger supporting performance and is suitable for supporting and positioning blood vessel walls with larger inner diameters and thicker thicknesses.

[0012] The present invention is further configured as follows: the number of braided strands of the metal fiber wires of each layer of the adaptive external support braided mesh tube is set between 2-128, the braiding density is set between 1-100 PPI, and the diameter of each metal fiber wire is controlled between 0.01-10 mm.

[0013] The present invention is further configured as follows: the straightening length of the adaptive external support braided mesh tube in the straightened state is controlled between 1-100 mm, and the external support expansion diameter of the adaptive external support braided mesh tube in the external support state is controlled between 1-30 mm.

[0014] The present invention is further configured as follows: the corresponding metal rings between the movable end and the driving end and between the fixed end and the front end of the inner tube are fixed by one of welding, fusion or bonding.

[0015] The present invention is further configured as follows: a locking structure is provided between the outer tube and the inner tube, and the locking structure can control the inner tube and the outer tube to switch between a locked state and an unlocked state.

[0016] By adopting the above technical solution, when the adaptive external support braided mesh tube is in a straightened state or an external support state, a locking structure can be used to lock and fix the inner tube and the outer tube, so that the inner tube and the outer tube remain relatively fixed and prevent the inner tube and the outer tube from slipping against each other, thereby keeping the adaptive external support braided mesh tube in a straightened state or a corresponding external support state.

[0017] The present invention is further configured as follows: the locking structure includes a positioning seat, a screw sleeve, an annular pressure block and a hose, the positioning seat is provided with a channel extending therethrough in the axial direction, one end of the outer tube is fixedly connected to the positioning seat so that the lumen of the outer tube is connected to the channel, the hose is connected to the outer tube, the positioning seat is threadedly connected to the screw sleeve, the screw sleeve is provided with a pressing portion, the annular pressure block and the hose are coaxially inserted into the channel, the pressing portion is pressed and matched with the annular pressure block, and drives the hose to undergo elastic deformation radially inward.

[0018] By adopting the above technical scheme, the screwing sleeve is rotated to drive the pressing part to approach or move away from the annular pressing block. When the pressing part presses the annular pressing block, the annular pressing block will press the hose downward. At this time, since the hose is restricted by the inner wall of the channel of the positioning seat on all sides, the hose can only undergo radial elastic deformation inward after being squeezed, and then the outer tube is pressed inward to be tightly pressed against the inner tube for locking. When the pressing part moves away from the annular pressing block, the pressing force of the annular pressing block on the hose disappears, and the hose is axially reset by its own elastic restoring force, so that the inner tube and the outer tube are released from the tight state and separated from each other. In this way, the present invention can realize the locking between the outer tube and the inner tube by rotating the screwing sleeve and using the annular pressing block to press the hose inward for deformation.

[0019] The present invention is further configured as follows: a control base is provided at one end of the inner tube away from the adaptive outer supporting braided mesh tube, and the control base is provided with a hemostatic valve connected to the rear end of the inner tube.

[0020] By adopting the above technical solution, the control base makes it convenient for doctors to rotate, push or 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.

[0021] Another technical object of the present invention is to provide a method for using a guiding catheter, comprising the following steps: S1: Preparation: Before the guiding catheter is placed in the predetermined position, ensure that the moving end of the adaptive outer support braided mesh tube is relatively far away from the fixed end, so that the adaptive outer support braided mesh tube is in a straightened state, so as to ensure that the outer diameter of the guiding catheter is uniform and consistent, so as to facilitate the smooth placement of the guiding catheter through the blood vessel into the predetermined position; S2: Insertion: Using the self-adaptive braided mesh tube in a straightened state as the insertion end, insert the guide catheter and push it to the vicinity of the predetermined position; S3: Positioning: When the front end of the guiding catheter reaches the vicinity of the predetermined position, the inner tube is kept stationary, and the outer tube is pushed to slide relative to the inner tube, so that the moving end of the adaptive outer support braided mesh tube gradually approaches the fixed end, and then the adaptive outer support braided mesh tube is radially expanded outward. When the adaptive outer support braided mesh tube is expanded outward to a predetermined diameter, the radially expanded side wall of the adaptive outer support braided mesh tube is used to abut against the inner wall of the blood vessel to achieve positioning; S4: Interventional surgery: Keep the inner tube and the outer tube relatively still, then guide the interventional instrument through the inner tube to the predetermined position for treatment. During the operation, the blood flow in the blood vessel is realized through the mesh holes on the adaptive outer support braided mesh tube in the outer support state; S5: Withdrawal: When the operation is completed, the outer tube is pulled outward to move the movable end away from the fixed end, and the adaptive outer support braided mesh tube is stretched to a straightened state. The adaptive outer support braided mesh tube is released from the inner wall of the blood vessel, and then the guiding catheter is pulled out of the blood vessel as a whole.

[0022] In summary, the present invention has the following beneficial effects: 1. The outer tube is movably sleeved outside the inner tube, and the fixed end of the adaptive external support braided mesh tube is fixedly connected to the front end of the inner tube through a metal ring, and the movable end of the adaptive external support braided mesh tube is fixedly connected to the driving end of the outer tube through another metal ring. The outer tube can slide relative to the inner tube, and the driving end drives the movable end to approach or move away from the fixed end, so that the adaptive external support braided mesh tube can be switched between the straightened state and the external support state. At the same time, by adjusting the distance between the movable end and the fixed end, the external support expansion diameter of the adaptive external support braided mesh tube can be adjusted to adapt to blood vessels of different inner diameters for positioning, so that doctors do not need to spend a lot of time selecting the specifications of the guide catheter, and at the same time greatly reduce the number of times the guide catheter is replaced during the operation, reduce safety hazards during the operation, and the hospital can also reduce the inventory of guide catheters and save medical costs.

[0023] 2. The metal ring has a strong developing property. The doctor can judge the insertion position of the guide catheter in the blood vessel by the position of the metal ring, which greatly enhances the visibility during the operation. In addition, the front and rear ends of the adaptive external support braided mesh tube in the present invention are fixed with metal rings, and the distance between the movable end and the fixed end of the adaptive external support braided mesh tube inserted into the blood vessel can be read, so as to accurately judge the external support release diameter of the adaptive external support braided mesh tube; the adaptive external support braided mesh tube is fixedly connected to the inner tube and the outer tube by corresponding metal rings respectively, so that the adaptive external support braided mesh tube and the inner tube maintain a high concentricity. During the operation, the adaptive external support braided mesh tube is centered in the blood vessel and fixed at the lesion position, and the position of the inner tube is also fixed accordingly. The high concentricity of the adaptive external support braided mesh tube and the inner tube ensures that the guide catheter is also in the center of the blood vessel, which is conducive to the insertion of the instrument, and at the same time greatly reduces the possibility of contact between the instrument and the blood vessel wall, thereby preventing the instrument from scratching the blood vessel wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is an overall structural diagram of the present invention, in which the adaptive external support braided mesh tube is in a straightened state.

[0025] Figure 2 It is a partial view of the adaptive external support braided mesh tube of the present invention in an external support state.

[0026] Figure 3 It is a cross-sectional view of the positioning seat with the outer tube installed and the screw cap separated from each other.

[0027] Figure 4 It is an exploded view of the locking structure of the present invention.

[0028] Figure 5 It is a cross-sectional view of the control base of the present invention.

[0029] In the figure: 1. inner tube; 11. control base; 111. hemostatic valve; 112. limit buckle; 2. outer tube; 21. driving end; 3. adaptive external support braided mesh tube; 30. metal fiber wire; 31. fixed end; 32. movable end; 33. mesh; 4. metal ring; 51. positioning seat; 511. channel; 52. screw sleeve; 521. pressing part; 53. annular pressure block; 54. hose. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with the accompanying drawings.

[0031] A supportive and adjustable guide catheter, such as Figure 1-Figure 2As shown, it includes an inner tube 1, an outer tube 2 movably sleeved outside the inner tube 1, and also includes an adaptive outer support braided mesh tube 3. The adaptive outer support braided mesh tube 3 includes a fixed end 31 and a movable end 32. The outer tube 2 includes a driving end 21 close to one end of the adaptive outer support braided mesh tube 3. The movable end 32 and the driving end 21, and the fixed end 31 and the front end of the inner tube 1 are fixedly connected by corresponding metal rings 4. The metal rings 4 have strong visualization. The doctor can judge the insertion position of the guide catheter in the blood vessel by the position of the metal rings 4, which greatly enhances the visibility during the operation. In the present invention, the front and rear ends of the adaptive outer support braided mesh tube 3 are fixed with metal rings 4, which can be used for the insertion. The distance between the movable end 32 and the fixed end 31 of the adaptive external support braided mesh tube 3 in the blood vessel is read, so as to accurately determine the external support release diameter of the adaptive external support braided mesh tube 3. In addition, the adaptive external support braided mesh tube 3 is fixedly connected to the inner tube 1 and the outer tube 2 respectively through the corresponding metal rings 4, so that the adaptive external support braided mesh tube 3 and the inner tube 1 maintain a high degree of concentricity; the outer tube 2 can slide relative to the inner tube 1, driving the driving end 21 to drive the movable end 32 to approach or move away from the fixed end 31, so that the adaptive external support braided mesh tube 3 can switch between the external support state and the straightened state. When the adaptive external support braided mesh tube 3 is in the external support state, hollow mesh holes 33 are formed on the surface of the adaptive external support braided mesh tube 3.

[0032] like Figure 2As shown, the adaptive external support braided mesh tube 3 is formed by three-dimensional weaving of a number of tough metal fiber wires 30. The metal has extremely strong developing properties. The adaptive external support braided mesh tube 3 formed by three-dimensional weaving of the metal fiber wires 30 has strong developing properties. Together with the metal rings 4 on both sides of the adaptive external support braided mesh tube 3, it achieves the purpose of multiple developing, which is helpful for doctors to judge the insertion position of the guide catheter in the blood vessel; in this embodiment, the number of concentric weaving layers of the adaptive external support braided mesh tube 3 is set to one layer, and the single-layer adaptive external support braided mesh tube 3 is thinner and has better flexibility, and is suitable for supporting and positioning thin blood vessel walls. In other embodiments, the number of concentric weaving layers of the adaptive external support braided mesh tube 3 can be set to at least two layers, and the multi-layer adaptive external support braided mesh tube 3 has stronger supporting performance and is suitable for supporting and positioning blood vessel walls with larger inner diameters and thicker blood vessels; each layer of adaptive The number of braided strands of the metal fiber wire 30 of the external support braided mesh tube 3 is set between 2-128, the braiding density is set between 1-100PPI, and the diameter of each metal fiber wire 30 is controlled between 0.01-10mm; the straightened length of the adaptive external support braided mesh tube 3 in the straightened state is controlled between 1-100mm, and the external support expansion diameter of the adaptive external support braided mesh tube 3 in the external support state is controlled between 1-30mm; the corresponding metal ring 4 between the movable end 32 and the driving end 21 and between the fixed end 31 and the front end of the inner tube 1 is fixed by 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 sizes and 2 specifications of fixing devices, totaling 8 specifications of guiding catheters to cover all patient surgical needs.

[0033] like Figure 1 and Figure 3-Figure 5As shown, a locking structure is provided between the tail of the inner tube 1 and the outer tube 2, and the locking structure can control the switching between the inner tube 1 and the outer tube 2 between the locked state and the unlocked state. When the adaptive external support braided mesh tube 3 is in a straightened state or an external support state, the inner tube 1 and the outer tube 2 can be locked and fixed by using the locking structure, so that the inner tube 1 and the outer tube 2 remain relatively fixed, and the inner tube 1 and the outer tube 2 are prevented from sliding relative to each other, so that the adaptive external support braided mesh tube 3 remains in the straightened state or the corresponding external support state; the locking structure includes a positioning seat 51, a screw sleeve 52, an annular pressure block 53 and a hose 54, and the positioning seat 51 A channel 511 is provided along the axial direction, one end of the outer tube 2 is fixedly connected to the positioning seat 51, so that the lumen of the outer tube 2 is connected to the channel 511, and the rubber hose 54 is connected by abutting against the end of the outer tube 2, and the positioning seat 51 is threadedly connected to the screw sleeve 52, and the screw sleeve 52 is provided with a pressing portion 521, and the annular pressing block 53 and the rubber hose 54 are coaxially arranged in the channel 511, and the pressing portion 521 is pressed and matched with the annular pressing block 53, and drives the rubber hose 54 to elastically deform radially inward, and the screw sleeve 52 is rotated to drive the pressing portion 521 to approach or move away from the annular pressing block 53, and when the pressing portion 521 presses the annular pressing block 53, the annular The pressing block 53 will press the rubber tube 54 downwards. At this time, since the rubber tube 54 is restricted by the inner wall of the channel 511 of the positioning seat 51 on all sides, the rubber tube 54 can only undergo radial elastic deformation inwards after being squeezed, thereby pressing the outer tube 2 to make it press inwards and lock it with the inner tube 1. When the pressing portion 521 moves away from the annular pressing block 53, the pressing force of the annular pressing block 53 on the rubber tube 54 disappears, and the rubber tube 54 uses its own elastic restoring force to reset axially, so that the inner tube 1 and the outer tube 2 are released from the pressed state and separated from each other. In this way, the present invention can rotate the screw sleeve 52 and use the annular pressing block 53 to press the rubber tube 54 inwards. The inner deformation realizes the locking between the outer tube 2 and the inner tube 1; a control base 11 is provided at the end of the inner tube 1 away from the adaptive external support 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. The control base 11 is convenient for doctors 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; a limit buckle 112 is provided on the outer wall of the control base 11, and the limit buckle 112 can limit the forward and backward moving distance between the outer tube 2 and the inner tube 1, thereby preventing surgical hazards caused by excessive relative sliding between the outer tube 2 and the inner tube 1.

[0034] The basic working principle of the present invention is: before the guiding catheter is placed in the predetermined position, ensure that the moving end 32 of the adaptive outer support braided mesh tube 3 is in a position relatively far away from the fixed end 31, so that the adaptive outer support braided mesh tube 3 is in a straightened state, so as to ensure that the overall outer diameter of the guiding catheter is uniform, and at the same time control the locking structure to be in a locked state, so that the outer tube 2 and the inner tube 1 are locked with each other, to prevent the outer tube 2 from slipping relative to the inner tube 1 when the guiding catheter is placed in the predetermined position, causing the adaptive outer support braided mesh tube 3 to accidentally expand, thereby facilitating the smooth placement of the guiding catheter through the blood vessel into the predetermined position, and using the adaptive outer support braided mesh tube 3 in a straightened state as the placement end, the guiding catheter is placed and pushed to the predetermined position. When the front end of the guiding catheter reaches the vicinity of the predetermined position, 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 pushing the outer tube 2 to slide relative to the inner tube 1, the moving end 32 of the adaptive outer support braided mesh tube 3 gradually approaches the fixed end 31, thereby causing the adaptive outer support braided mesh tube 3 to expand radially outward. When the adaptive outer support braided mesh tube 3 expands outward to a predetermined diameter, the locking structure is switched to the locked state, and the radially expanded side wall of the adaptive outer support braided mesh tube 3 is used to abut against the inner wall of the blood vessel to achieve positioning, keeping the locking structure in the locked state, and then guiding the interventional instrument through the inner tube 1 to the predetermined position for treatment. When the operation is over, the locking structure is switched to the unlocked state, and the outer tube 2 is pulled outward so that the movable end 32 of the outer tube 2 is away from the fixed end 31, and the adaptive external support braided mesh tube 3 is stretched to the straightened state, and the adaptive external support braided mesh tube 3 is released from the inner wall of the blood vessel, and then the locking structure is switched to the locked state, and then the guiding catheter is pulled out of the blood vessel as a whole; the present invention arranges an adaptive external support braided mesh tube 3 at the front end of the guiding catheter, and controls the outer tube 2 to slide relative to the inner tube 1, so as to realize the switching of the adaptive external support braided mesh tube 3 between the straightened state and the external support state, so that the front end of the guiding catheter can be pressed against the blood vessel at the corresponding predetermined position through the adaptive external support braided mesh tube 3 in the external support state. The positioning is achieved on the tube wall, thereby reducing the blood flow impulse during the operation or the reaction force generated by pulling the guiding catheter, which causes the guiding catheter to be displaced or deformed. At the same time, the outer support expansion diameter of the adaptive outer support braided mesh tube 3 can be adjusted by adjusting the distance between the movable end 32 and the fixed end 31, so as to adapt to the blood vessels with different inner diameters for positioning, which greatly increases the versatility of the guiding catheter, so that the present invention can be compatible with the positioning of blood vessels with different diameters, so that doctors do not need to spend a lot of time selecting the specifications of the guiding catheter, and at the same time greatly reduces the number of times the guiding catheter is replaced during the operation, reduces the safety hazards during the operation, and the hospital can also reduce the inventory of guiding catheters, saving medical costs;In addition, the adaptive external support braided mesh tube 3 woven by the metal fiber wire 30 itself has a certain development function, and the metal ring 4 also has a strong development property. The doctor can judge the insertion position of the guide catheter in the blood vessel by the position of the metal ring 4, which greatly enhances the visibility during the operation. In addition, the adaptive external support braided mesh tube 3 in the present invention is fixed with metal rings 4 at both the front and rear ends, and the distance between the movable end 32 and the fixed end 31 of the adaptive external support braided mesh tube 3 inserted into the blood vessel can be read, so as to accurately judge the external support release diameter of the adaptive external support braided mesh tube 3; the adaptive external support braided mesh tube 3 is fixedly connected to the inner tube 1 and the outer tube 2 respectively by the corresponding metal rings 4, so that the adaptive external support braided mesh tube 3 and The inner tube 1 maintains a high concentricity. During the operation, the adaptive outer braided mesh tube 3 is expanded and fixed at the lesion position in the blood vessel, and the position of the inner tube 1 is also fixed. The high concentricity of the adaptive outer braided mesh tube 3 and the inner tube 1 ensures that the guide catheter is also in the center of the blood vessel, which is conducive to the penetration of the instrument. At the same time, the possibility of contact between the instrument and the blood vessel wall is greatly reduced, thereby preventing the instrument from scratching the blood vessel wall. The invention has the effects of adjustable outer support expansion diameter and support of the adaptive outer braided mesh tube 3, suitable for positioning blood vessels of different diameters, convenient operation, reduced difficulty and risk of surgical operation, high centrality of the guide catheter after it penetrates the blood vessel, and improved visualization, which is conducive to the doctor's accurate judgment of the insertion position of the guide catheter. ;

[0035] A method for using a supportively adjustable guiding catheter comprises the following steps: S1: Preparation: Before the guiding catheter is placed in the predetermined position, ensure that the movable end 32 of the adaptive outer support braided mesh tube 3 is relatively far away from the fixed end 31, so that the adaptive outer support braided mesh tube 3 is in a straightened state, so as to ensure that the outer diameter of the guiding catheter as a whole is uniform, and at the same time control the locking structure to be in a locked state, so that the outer tube 2 and the inner tube 1 are locked with each other, so as to prevent the outer tube 2 from slipping relative to the inner tube 1 when the guiding catheter is placed in the predetermined position, causing the adaptive outer support braided mesh tube 3 to be accidentally expanded, thereby facilitating the smooth placement of the guiding catheter through the blood vessel into the predetermined position; S2: Insertion: Using the self-adaptive braided mesh tube 3 in a straightened state as the insertion end, insert the guide catheter and push it to the vicinity of the predetermined position; S3: Positioning: When the front end of the guiding catheter reaches the vicinity of the predetermined position, the locking structure is switched to the unlocking state, and the outer tube 2 can slide freely relative to the inner tube 1. By keeping the inner tube 1 stationary and pushing the outer tube 2 to slide relative to the inner tube 1, the moving end 32 of the adaptive outer support braided mesh tube 3 gradually approaches the fixed end 31, and then the adaptive outer support braided mesh tube 3 is radially expanded outward. When the adaptive outer support braided mesh tube 3 is expanded outward to a predetermined diameter, the locking structure is switched to the locking state, and the radially expanded side wall of the adaptive outer support braided mesh tube 3 is used to abut against the inner wall of the blood vessel to achieve positioning; S4: Interventional surgery: Keep the locking structure in the locked state, and then guide the interventional instrument through the inner tube 1 to the predetermined position for treatment. During the operation, the blood flow in the blood vessel is circulated through the mesh 33 on the adaptive external support braided mesh tube 3 in the external support state; S5: Withdrawal: When the operation is completed, the locking structure is switched to the unlocked state, and the outer tube 2 is pulled outward so that the movable end 32 of the outer tube 2 is away from the fixed end 31, and the adaptive outer support braided mesh tube 3 is stretched to a straightened state. The adaptive outer support braided mesh tube 3 is released from the inner wall of the blood vessel, and then the locking structure is switched to the locked state, and then the guiding catheter is pulled out of the blood vessel as a whole.

[0036] The above description is only a preferred embodiment of the present invention, so all equivalent changes or modifications made according to the structure, characteristics and principles described in the scope of the patent application of the present invention are included in the scope of the patent application of the present invention.

Claims

1. A supportive and adjustable guiding catheter, comprising an inner tube (1) and an outer tube (2) movably sleeved outside the inner tube (1), characterized in that: It also comprises an adaptive external braided mesh tube (3), the adaptive external braided mesh tube (3) comprising a fixed end (31) and a movable end (32), the outer tube (2) comprising a driving end (21) close to one end of the adaptive external braided mesh tube (3), the movable end (32) and the driving end (21), and the fixed end (31) and the front end of the inner tube (1) are fixedly connected via corresponding metal rings (4); The outer tube (2) can slide relative to the inner tube (1), driving the driving end (21) to drive the movable end (32) to approach or move away from the fixed end (31), so that the adaptive external support braided mesh tube (3) is switched between an external support state and a straightened state. When the adaptive external support braided mesh tube (3) is in the external support state, mesh holes (33) are formed on the surface of the adaptive external support braided mesh tube (3).

2. A support-adjustable guiding catheter according to claim 1, characterized in that: The adaptive external support braided mesh tube (3) is formed by three-dimensionally braiding a plurality of tough metal fiber wires (30).

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

4. The support-adjustable guiding catheter according to claim 1, characterized in that: The number of braided strands of the metal fiber wire (30) of 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 diameter of each metal fiber wire (30) is controlled between 0.01 and 10 mm.

5. The support-adjustable guiding catheter according to claim 1, characterized in that: The straightened length of the adaptive externally supported braided mesh tube (3) in the straightened state is controlled between 1 and 100 mm, and the externally supported expanded diameter of the adaptive externally supported braided mesh tube (3) in the externally supported state is controlled between 1 and 30 mm.

6. The support-adjustable guiding catheter according to claim 1, characterized in that: The corresponding metal rings (4) between the movable end (32) and the driving end (21) and between the fixed end (31) and the front end of the inner tube (1) are fixed by one of welding, melting or bonding.

7. The support-adjustable 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 inner tube (1) and the outer tube (2) to switch between a locked state and an unlocked state.

8. The support-adjustable guiding catheter according to claim 7, characterized in that: The locking structure comprises a positioning seat (51), a screw sleeve (52), an annular pressure block (53) and a rubber tube (54); the positioning seat (51) is provided with a channel (511) extending through the positioning seat along the axial direction; one end of the outer tube (2) is fixedly connected to the positioning seat (51) so that the lumen of the outer tube (2) is communicated with 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 portion (521); the annular pressure block (53) and the rubber tube (54) are coaxially inserted into the channel (511); the pressing portion (521) is pressed and matched with the annular pressure block (53) and drives the rubber tube (54) to elastically deform radially inward.

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

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