Asymmetric laser etching gradient thin-walled catheter and controllable method thereof

Abstract

The application discloses an asymmetric laser etching gradient thin-walled catheter and a controllable method thereof, wherein the first, second and third curved portions adopt a wall thickness increment structure, so that the catheter is kept flexible as a whole, and the end supporting force is significantly enhanced; the fishbone etching part is distributed along the same horizontal plane, a directional reinforcing structure is formed on the catheter sidewall through an asymmetric etching process, the catheter head end is more easily passed through a complex blood vessel path, the proximal end anti-bending performance is improved, the flexible and rigid requirements are effectively balanced, the blood vessel injury risk is further reduced, and the intraoperative control stability is improved, the axial bending flexibility is retained, and the radial anti-kinking capacity is significantly enhanced, the structure makes the catheter more easily conform to the blood vessel direction during pushing, meanwhile, the risk of fracture caused by local stress concentration is avoided, and finally the precision and safety of the interventional operation are improved, and the defects that the catheter cannot balance the rigidity and bending performance in the prior art are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of catheter, in particular to an asymmetric laser etching gradient thin-walled catheter and a controllable method thereof. BACKGROUND

[0002] In the field of interventional medicine, especially for complex surgical scenarios such as coronary chronic total occlusion (CTO), peripheral arterial disease and neurovascular intervention, traditional catheters often face the technical bottleneck that the rigidity support force and bending flexibility are difficult to balance. When the catheter needs to pass through a tortuous blood vessel path of tens of centimeters, the operator often faces a dilemma: if the catheter is not rigid enough, it is easy to deform due to blood vessel resistance during pushing, resulting in the instrument failing to reach the target position; if the rigidity is too strong, it is difficult to deform due to the lack of deformation ability when passing through the blood vessel bifurcation or angled lesions, causing the risk of tearing or perforating the blood vessel intima. This contradiction is particularly prominent when dealing with calcified lesions, serial stenosis or highly twisted blood vessel anatomy, directly leading to a decrease in surgical success rate, an increase in operation time and an increase in the incidence of complications.

[0003] In CTO intervention, after the guide wire passes through the occluded segment, the catheter needs to have sufficient axial rigidity to maintain the stability of the passage and prevent pushing failure caused by hematoma compression or plaque hardness; while passing through the curved segment of the blood vessel, the catheter tip is required to deform to fit the blood vessel direction with low resistance, avoiding mechanical stimulation to the fragile intima. Traditional catheters are limited by the limitations of material properties and structural design, and it is difficult to realize this dynamic performance switching on a single instrument, often requiring repeated replacement of different property catheters during surgery, significantly increasing the complexity of the operation and the risk of radiation exposure.

[0004] Therefore, it is necessary to improve the catheter in the prior art. SUMMARY

[0005] The present application overcomes the shortcomings of the prior art and provides an asymmetric laser etching gradient thin-walled catheter and a controllable method thereof.

[0006] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows: an asymmetric laser etching gradient thin-walled catheter, comprising a first bending portion, a second bending portion and a third bending portion connected in sequence, characterized in that:

[0007] The first bending portion is provided with a first through hole inside;

[0008] The second bending portion and the third bending portion are respectively provided with a second through hole and a third through hole, and the second through hole is in communication with the first through hole and the third through hole;

[0009] A connecting portion is arranged between the first curved portion and the second curved portion and between the second curved portion and the third curved portion, and the wall thickness of the first curved portion, the second curved portion and the third curved portion increases in turn.

[0010] The side edges of the first curved portion, the second curved portion and the third curved portion are respectively provided with fishbone etching portions, and a plurality of fishbone etching portions are arranged on the same horizontal plane.

[0011] In a preferred embodiment of the present application, the first curved portion, the second curved portion and the third curved portion are coaxially arranged.

[0012] In a preferred embodiment of the present application, the wall thickness of the first curved portion, the second curved portion and the third curved portion is respectively 0.1-0.15 mm, 0.2-0.25 mm and 0.25-0.3 mm.

[0013] In a preferred embodiment of the present application, the first curved portion, the second curved portion and the third curved portion are made of the same material, and the material is one of stainless steel and nickel-titanium alloy.

[0014] In a preferred embodiment of the present application, the fishbone etching portion of the second curved portion and the fishbone etching portion of the first curved portion are arranged on different sides, and the fishbone etching portion of the third curved portion and the fishbone etching portion of the first curved portion are arranged on the same side.

[0015] In a preferred embodiment of the present application, the first curved portion, the second curved portion and the third curved portion are respectively provided with a coating, the coating of the first curved portion and the coating of the second curved portion are hydrophobic coatings, and the material used is one of polytetrafluoroethylene and silicone, the coating of the third curved portion is a hydrophilic coating, and the material used is one of polyurethane, polyvinyl alcohol and polyvinylpyrrolidone.

[0016] In a preferred embodiment of the present application, the length of the first curved portion, the second curved portion and the third curved portion decreases in turn.

[0017] In a preferred embodiment of the present application, the transverse arrangement density of the fishbone etching portions of the first curved portion, the second curved portion and the third curved portion gradually increases.

[0018] To achieve the above-mentioned purpose, the second set of technical solutions adopted by the present application is a controllable method for an asymmetric laser etching gradient thin-walled catheter, based on an asymmetric laser etching gradient thin-walled catheter, comprising the following steps:

[0019] S1: The catheter is inserted, and the fishbone etching portion of the first curved portion is arranged at the bending position;

[0020] S2: continue to deepen the conduit with the side of the fishbone etching portion of the first bending portion facing the area to be bent;

[0021] S3: continue to deepen the conduit and rotate the conduit so that the side of the fishbone etching portion of the second bending portion faces the area to be bent;

[0022] S4: repeat the operation until the specified area is reached.

[0023] In a preferred embodiment of the present application, the required bending degree and the size of the control applied external force are in a positive correlation.

[0024] The present application solves the defects in the background art and has the following beneficial effects:

[0025] (1) The present application provides an asymmetric laser etching gradient thin-walled conduit, the first, second and third bending portions adopt a wall thickness increasing structure, so that the conduit has significantly enhanced end support while maintaining overall flexibility, and the fishbone etching portion is distributed along the same horizontal plane, forming a directional strengthening structure on the conduit sidewall through an asymmetric etching process, compared with the conduit in the prior art, the conduit head end is more easily passed through a complex blood vessel path, and the proximal end has improved folding resistance, effectively balancing the flexibility and rigidity requirements, further reducing the risk of blood vessel damage and improving the intraoperative control stability, retaining axial bending flexibility and significantly enhancing radial anti-kinking ability, this structure makes the conduit more easily conform to the blood vessel direction during pushing, while avoiding the risk of fracture caused by local stress concentration, ultimately improving the precision and safety of interventional surgery, solving the defect that the conduit in the prior art cannot balance rigidity and bending performance.

[0026] (2) In the present application, the combination of coaxial arrangement and gradient wall thickness structure, the design of wall thickness increasing of each bending portion is matched with coaxial layout, so that the conduit realizes a breakthrough in anti-kinking performance, compared with the prior art, the conduit can uniformly disperse deformation when bearing lateral pressure, significantly reducing the occurrence of local wrinkles or collapse.

[0027] (3) In the present application, the fishbone etching portion is distributed along the same horizontal plane, forming a directional strengthening structure on the conduit sidewall through an asymmetric etching process, the conduit head end is more easily passed through a complex blood vessel path, and the proximal end has improved folding resistance, compared with the prior art, effectively balancing the flexibility and rigidity requirements, further reducing the risk of blood vessel damage and improving the intraoperative control stability, retaining axial bending flexibility and significantly enhancing radial anti-kinking ability, this structure makes the conduit more easily conform to the blood vessel direction during pushing.

[0028] (4) In the present application, the fusion design of fishbone etching structure and gradient wall thickness fully develops the material mechanics potential, the thicker wall thickness of the third bending part provides a larger processing window for the etching process, compared with the prior art, the depth and density of the fishbone etching can be precisely controlled, the radial support force of the catheter is significantly enhanced while the axial compliance is maintained, the application range of the catheter in high resistance environment such as calcified lesions is further expanded, and the customization of the performance of the interventional instrument is realized.

[0029] (5) In the present application, the synergistic effect of single material selection and gradient wall thickness design makes a breakthrough balance between biocompatibility and processing feasibility, compared with the prior art, the super-elasticity characteristics of nickel-titanium alloy combined with the gradient increasing wall thickness structure, this feature enables the catheter to maintain the head end compliant fitting in complex blood vessel path, and also provides stable support through the thickening segment, significantly improving the smoothness of pushing in tortuous blood vessels.

[0030] (6) In the present application, the reverse matching design of bending part length gradient and etching density gradient forms a progressive mechanical transition zone. The compliant deformation region of the first bending part and the rigid support region of the third bending part 300 are smoothly transitioned through the second bending part, compared with the prior art, the pushing force fluctuation of the catheter in the tortuous path is significantly reduced, the perception accuracy of the operator to the catheter head end position is further optimized, especially when dealing with bifurcated lesions, the alternating control of the main branch and the side branch vessels can be realized without frequent replacement of the instrument.

[0031] (7) In the present application, the required bending degree and the size of the control applied external force are in a positive correlation. By establishing a linear correlation mechanism between the bending degree and the amount of external force, precise quantitative control of interventional operation is realized, compared with the prior art, the deformation amplitude of the catheter can be predicted through intuitive force feedback, the navigation accuracy in complex path is significantly improved, the risk of blood vessel perforation caused by excessive force is effectively reduced, especially in high-risk scenarios such as treatment of chronic total occlusion of coronary artery. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creating laborious work;

[0033] Figure 1 is a perspective view of the preferred embodiment of the present application;

[0034] Figure 2 is a top view of the preferred embodiment of the present application;

[0035] Figure 3 is a side view of a preferred embodiment of the present application;

[0036] In the figure: 100, first bending part; 200, second bending part; 300, third bending part; 400, fishbone etching part. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0038] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced without the specific details, other than those described herein, and therefore the scope of the application is not limited to the details of the embodiments described herein.

[0039] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the scope of protection of the present application. In addition, the terms "first", "second" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "multiple" is two or more.

[0040] In the description of the present application, it should be noted that unless otherwise specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication between the two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood through specific circumstances.

[0041] The case is integrated by gradient wall thickness design, fishbone etching structure optimization and controllable deformation method, and a rigid-flexible continuous adjustable technology platform is constructed. Its use scenarios cover the whole path intervention requirements from the aortic arch large angle turning to the small branch of the distal coronary artery, and it is especially suitable for complex operations that need to consider long distance pushing force and multi-plane bending adaptability. For example, in peripheral artery intervention, when the catheter needs to pass through the iliac artery bifurcation and abdominal aortic curvature from the femoral artery, the case technology can ensure that the proximal rigid section provides stable support and the distal flexible section realizes non-invasive passage, fundamentally solving the performance fault problem of traditional catheters being too hard or too soft, and providing a revolutionary solution for high-difficulty interventional therapy.

[0042] As shown in Figure 1 and Figure 2 An asymmetric laser etching gradient thin-walled catheter, comprising a first bending part 100, a second bending part 200 and a third bending part 300 connected in turn, characterized in that:

[0043] The first bending part 100 is provided with a first through hole inside;

[0044] The second bending part 200 and the third bending part 300 are respectively provided with a second through hole and a third through hole inside, and the second through hole is respectively communicated with the first through hole and the third through hole; The first bending part 100 and the second bending part 200, and the second bending part 200 and the third bending part 300 are respectively provided with a connecting part, and the wall thickness of the first bending part 100, the second bending part 200 and the third bending part 300 increases in turn; The continuous design of three-section through hole constructs an unobstructed inner cavity channel, combined with the outer diameter optimization brought by gradient wall thickness, the fluid resistance is reduced compared with traditional segmented through hole structure, the drug delivery efficiency or instrument passing performance is improved, the risk of thrombosis is effectively reduced, the release uniformity of treatment material is optimized, a more reliable solution for complex interventional therapy is provided, and it is especially suitable for high-precision drug delivery or instrument exchange requirements.

[0045] As shown in Figure 3 The side edges of the first bending part 100, the second bending part 200 and the third bending part 300 are respectively provided with fishbone etching parts 400, and a plurality of fishbone etching parts 400 are arranged on the same horizontal plane.

[0046] The first bending part 100, the second bending part 200 and the third bending part 300 adopt a wall thickness increasing structure, so that the catheter is significantly enhanced in the end support force while maintaining the overall flexibility, the fishbone etching part 400 is characterized by being distributed along the same horizontal plane, a directional strengthening structure is formed on the catheter sidewall through an asymmetric etching process, the catheter head end is more easily passed through a complex blood vessel path, the proximal end is improved in the folding resistance, the flexible and rigid requirements are effectively balanced, the blood vessel damage risk is further reduced and the in-surgery control stability is improved, the axial bending flexibility is retained, and the radial anti-kinking capacity is significantly enhanced, the structure makes the catheter more easily conform to the blood vessel trend during pushing, while avoiding the risk of fracture caused by local stress concentration, finally improving the precision and safety of the interventional surgery, and solving the defects that the catheter cannot balance the rigidity and bending performance in the prior art.

[0047] The first bending part 100, the second bending part 200 and the third bending part 300 are coaxially arranged. The asymmetric laser etching gradient thin-walled catheter disclosed in the present case realizes significant improvement in axial stability through the coaxial arrangement of the first, second and third bending parts 300, and the coaxial feature ensures that each section of the catheter remains highly concentric when being bent or twisted, which effectively disperses external stress, and the catheter is more accurate in pushing in a complex blood vessel path, further reducing the risk of surgical complications.

[0048] The combination of coaxial arrangement and gradient wall thickness structure enables the catheter to achieve a breakthrough in the anti-kinking performance. The design of increasing wall thickness of each bending part is matched with the coaxial layout, so that the catheter can uniformly disperse deformation when bearing lateral pressure, significantly reducing the occurrence of local wrinkles or collapse, and further improving the real-time control accuracy of the catheter head end by the operator.

[0049] The fusion of the coaxial feature of the three bending parts and the continuous through hole design optimizes the fluid dynamics performance of the catheter lumen, and the coaxial structure ensures that the through hole axis is completely coincident, which eliminates the turbulence caused by the axis deviation of the traditional segmented through hole, and the drug or instrument passes more smoothly, further reducing the risk of residue of therapeutic substances in the catheter, providing reliable protection for interventional therapy requiring precise dose control.

[0050] The wall thicknesses of the first bending part 100, the second bending part 200 and the third bending part 300 are 0.1-0.15 mm, 0.2-0.25 mm and 0.25-0.3 mm respectively. Through the design of the wall thicknesses of the first, second and third bending parts 300 increasing by 0.1-0.15 mm, 0.2-0.25 mm and 0.25-0.3 mm respectively, a precise balance between flexibility and support force is achieved. The ultra-thin wall thickness of the first bending part 100 endows it with excellent axial flexibility, which makes the catheter head end more easily conform to the natural bending path of the blood vessel, significantly reducing the mechanical stimulation to the blood vessel intima, and further improving the passability in complex anatomical structures.

[0051] The gradient wall thickness structure and the coaxial arrangement work together to achieve a breakthrough optimization in the kink resistance of the catheter. The third bending portion 300 is increased to a wall thickness design of 0.25-0.3 mm, which effectively improves the bending strength of the proximal end of the catheter, significantly reduces the local collapse caused by external force compression during pushing, and further ensures the integrity of the lumen passage, providing a reliable structural basis for crossing high-resistance lesions.

[0052] The fusion design of the fishbone etching structure and the gradient wall thickness fully utilizes the mechanical potential of the material. The thicker wall thickness of the third bending portion 300 provides a larger processing window for the etching process, which allows precise control of the depth and density of the fishbone etching, significantly enhances the radial support force of the catheter while maintaining axial flexibility, further expands the application range of the catheter in high-resistance environments such as calcified lesions, and realizes the customization of the performance of interventional devices.

[0053] The materials of the first bending portion 100, the second bending portion 200, and the third bending portion 300 are consistent, and the material is one of stainless steel and nickel-titanium alloy. By using uniform stainless steel or nickel-titanium alloy material for the first, second, and third bending portions 300, the structural mechanical properties are deeply optimized. The material consistency feature ensures that each section of the catheter presents uniform stress response characteristics when bending or twisting, which effectively avoids stress concentration at the junction of multiple materials, significantly improves the overall fatigue resistance of the catheter, and further prolongs the service life of the device and reduces the probability of accidents during the operation.

[0054] The synergy of single material selection and gradient wall thickness design achieves a breakthrough balance between biocompatibility and processing feasibility. The super-elasticity of nickel-titanium alloy combined with the gradient increasing wall thickness structure allows the catheter to maintain a soft and conformable head end in complex vascular paths while providing stable support through the thickened section, significantly improving the smoothness of pushing in tortuous blood vessels.

[0055] The fusion of material consistency features and fishbone etching process fully releases the mechanical potential of the material itself. The high rigidity of stainless steel combined with directional etching structure allows the catheter to maintain axial compression resistance while achieving controllable radial flexibility through the etching area, significantly enhancing the catheter's ability to cross calcified lesions, further improving the adaptability of interventional devices to complex lesion environments, and achieving precise matching of structural function and material properties.

[0056] The herringbone etching part 400 of the second bending part 200 is arranged on a different side from the herringbone etching part 400 of the first bending part 100, and the herringbone etching part 400 of the third bending part 300 is arranged on the same side as the first bending part 100 and the herringbone etching part 400. Through the design of the herringbone etching part 400 of the second bending part 200 being arranged on a different side from the first and third bending parts 300, precise regulation and control of the three-dimensional space bending characteristics are achieved. This feature enables the second bending part 200 to form a directional compliant zone through the different-side etching structure during the axial pushing process of the catheter, significantly improving the self-adaptive ability of the catheter in the composite bending path and further optimizing the precise steering performance at the vascular bifurcation.

[0057] The feature of the herringbone etching of the third bending part 300 being arranged on the same side as the first bending part 100 creates a mechanical memory effect at the end of the catheter, enabling the same-side etching structure to form a consistent bending tendency when the catheter head exits the guide catheter, significantly enhancing the shape stability of the catheter after it is in place and further reducing the risk of vascular wall scratching, providing reliable protection for precise positioning of stent release.

[0058] The combination feature of the different-side etching of the second bending part 200 and the same-side etching of the third bending part 300 forms a twist compensation mechanism in the middle section of the catheter. When the catheter is twisted by external force, the different-side etching area can absorb the torque through differential deformation, while the same-side area maintains axial continuity, significantly reducing the twist hysteresis phenomenon and further improving the synchronization of the surgeon's hand movements and the response of the catheter head, providing a more efficient control experience for complex long lesion interventional therapy.

[0059] The first bending part 100, the second bending part 200, and the third bending part 300 are respectively provided with a coating, the coating of the first bending part 100 and the coating of the second bending part 200 are hydrophobic coatings, the material used is one of polytetrafluoroethylene and silicone, and the coating of the third bending part 300 is a hydrophilic coating, the material used is one of polyurethane, polyvinyl alcohol, and polyvinylpyrrolidone. Through the differential design of the first and second bending parts 200 using hydrophobic coatings and the third bending part 300 using hydrophilic coatings, precise regulation and control of the friction characteristics throughout the intervention are achieved. The hydrophobic coating of the first and second bending parts 200 can form a low surface energy interface in a dry state, which enables the catheter to significantly reduce direct friction with the vascular intima during initial pushing, reduces the forward resistance in the tortuous path, and further optimizes the immediate feedback of the surgeon's hand operation.

[0060] The hydrophilic coating of the third curved section 300 cooperates with the thickened wall thickness to construct an intelligent lubrication system at the catheter tip. When the region contacts blood, the hydrophilic coating rapidly absorbs water to form a gel-like lubricating layer, significantly reducing friction fluctuations during stent delivery, further ensuring the smoothness of the precision instrument through calcified lesions. At the same time, the combination of the hydrophilic coating and the thickened wall provides sufficient radial support force to the tip, achieving a dynamic balance between flexibility and pushing force.

[0061] The fusion design of the hydrophobic-hydrophilic segmented coating system and the fishbone etching structure fully releases the performance boundaries of surface modification technology. The hydrophobic coating of the first and second curved sections 200 can effectively prevent nonspecific adsorption of blood components in the etching grooves, while the hydrophilic coating of the third curved section 300 enhances the adhesion stability of therapeutic drugs in the etching area through hydrogen bonding, significantly improving the functional durability of the catheter in complex interventional procedures, further expanding the application potential of drug-eluting catheters in long-term surgery, and achieving dual optimization of mechanical properties and biological functions.

[0062] The lengths of the first curved section 100, the second curved section 200, and the third curved section 300 decrease, and the lateral arrangement density of the fishbone etching part 400 gradually increases. Through the cooperative design of the decreasing lengths of the first, second, and third curved sections 300 and the increasing lateral density of the fishbone etching, the precision optimization of interventional path adaptability is achieved. The longer structure of the first curved section 100 combined with the low-density etching feature enables the catheter tip to maintain low resistance deformation when passing through large-angle bends such as the aortic arch, significantly reducing mechanical stimulation to the vascular intima, and further improving initial passability in complex anatomical structures.

[0063] The fusion of the shorter structure of the third curved section 300 and the high-density etching feature constructs a reinforced support system at the catheter tip. The high-density fishbone etching forms a dense grid structure in the shortened curved section, significantly enhancing the radial support force of the catheter tip when traversing calcified lesions, further ensuring the precise release of stents and other instruments, and the shorter length design reduces the tip redundancy, providing a more direct manipulation path for deep vascular intervention.

[0064] The reverse matching design of the length gradient and the etching density gradient forms a gradual mechanical transition zone. The flexible deformation region of the first curved section 100 and the rigid support region of the third curved section 300 are smoothly transitioned through the second curved section 200, significantly reducing the pushing force fluctuations of the catheter in the tortuous path, further optimizing the perception accuracy of the catheter tip position by the operator, especially when dealing with bifurcated lesions, alternating manipulation of the main branch and side branch vessels can be achieved without frequent instrument replacement.

[0065] A controllable method for an asymmetric laser etching gradient thin-walled catheter, based on an asymmetric laser etching gradient thin-walled catheter, comprising the following steps:

[0066] S1: Deepen the catheter and set the fishbone etching portion 400 of the first bending portion 100 at the bending area to be bent;

[0067] S2: Direct the side edge of the fishbone etching portion 400 towards the bending area to be bent, continue to deepen the catheter, and the fishbone etching portion 400 of the first bending portion 100 deforms and bends through the bending area to be bent; the operation feature of directing the fishbone etching side edge of the first bending portion 100 towards the operation feature of the initial bending area makes full use of the flexible deformation ability of the etching structure in a specific direction, enables the catheter head end to pass through the first tortuous section with minimum resistance, and significantly reduces the risk of endovascular intimal injury, especially when dealing with large-angle bends such as aortic arches.

[0068] S3: Continue to deepen the catheter and rotate the catheter so that the side edge of the fishbone etching portion 400 of the second bending portion 200 faces the bending area to be bent; the operation feature of rotating the catheter to align the fishbone etching side edge of the second bending portion 200 with the subsequent bending area builds a gradual mechanical adaptation mechanism. By axial rotation, the etching deformation area of different bending portions is activated, realizing the continuous self-adaptation of the catheter in the compound bending path, greatly shortening the operation time and reducing the radiation exposure, and especially showing high efficiency in the treatment of serial lesions.

[0069] S4: Repeat the operation to reach the specified area. The synergistic effect of the whole set of controllable methods and the gradient wall thickness and heterolateral etching features of the catheter forms a closed-loop control system for three-dimensional space navigation. In the repeated operation of step S4, the wall thickness increment structure provides axial support force guarantee for continuous bending, and the directional deformation of the fishbone etching ensures the radial flexibility, significantly improving the path controllability of the catheter in complex anatomical structures, further expanding the application boundary of high-difficulty interventional surgery, and providing an innovative solution for the opening of chronic total occlusion lesions of coronary arteries.

[0070] The required bending degree and the size of the control applied external force are in a positive correlation. By establishing a linear correlation mechanism between the bending degree and the amount of external force applied, precise quantitative control of the interventional operation is realized. This feature enables the operator to predict the deformation amplitude of the catheter through intuitive force feedback, significantly improving the navigation accuracy in complex paths, effectively reducing the risk of blood vessel perforation caused by excessive force, and especially showing significant advantages in high-risk scenarios such as chronic total occlusion lesions of coronary arteries.

[0071] A gradual deformation control model is built, and when the catheter passes through the tortuous blood vessels, the operator can gradually increase the pushing force to realize controllable bending, significantly reducing the instantaneous stress impact on the blood vessel wall, further optimizing the safety of passing through fragile blood vessel sections, and providing a more gentle interventional solution for elderly patients or cases with reduced blood vessel elasticity.

[0072] The control method cooperates with the catheter gradient wall thickness and the fishbone etching structure to form a closed-loop optimization system of mechanical properties. The bending process driven by external force is converted into controllable axial support force through the wall thickness increment structure, and the directional deformation of the fishbone etching ensures the accurate guidance of the radial bending, significantly enhances the penetration ability of the catheter in the high resistance environment such as calcified lesions, further expands the technical boundary of the interventional therapy of complex lesions, and realizes the deep matching of the instrument performance and the clinical demand.

[0073] The above is based on the ideal embodiment of the application, and through the above description, relevant personnel can make various changes and modifications without deviating from the technical idea of the application. The technical scope of the application is not limited to the contents of the specification, and the technical scope must be determined according to the scope of claims.

Claims

1. A non-symmetrical laser etching gradient thin-walled catheter, comprising a first curved portion (100), a second curved portion (200) and a third curved portion (300) connected in sequence, characterized in that: the first curved portion (100) is internally provided with a first through hole; the second curved portion (200) and the third curved portion (300) are internally provided with a second through hole and a third through hole respectively, and the second through hole respectively communicates with the first through hole and the third through hole; a connecting portion is respectively arranged between the first curved portion (100) and the second curved portion (200) and between the second curved portion (200) and the third curved portion (300), and the wall thicknesses of the first curved portion (100), the second curved portion (200) and the third curved portion (300) gradually increase in sequence; the side edges of the first curved portion (100), the second curved portion (200) and the third curved portion (300) are respectively provided with fishbone etching portions (400), and the fishbone etching portions (400) are arranged on the same horizontal plane; the fishbone etching portion (400) of the second curved portion (200) is arranged on a different side from the first curved portion (100) and the fishbone etching portion (400), and the fishbone etching portion (400) of the third curved portion (300) is arranged on the same side as the fishbone etching portion (400) of the first curved portion (100); the first curved portion (100), the second curved portion (200) and the third curved portion (300) are coaxially arranged; the wall thicknesses of the first curved portion (100), the second curved portion (200) and the third curved portion (300) are 0.1-0.15 mm, 0.2-0.25 mm and 0.25-0.3 mm respectively; the materials of the first curved portion (100), the second curved portion (200) and the third curved portion (300) are the same, and the material is one of stainless steel and nickel-titanium alloy; the first curved portion (100), the second curved portion (200) and the third curved portion (300) are respectively provided with a coating, the coating of the first curved portion (100) and the coating of the second curved portion (200) are hydrophobic coatings, the material used is one of polytetrafluoroethylene and silicone, and the coating of the third curved portion (300) is a hydrophilic coating, the material used is one of polyurethane, polyvinyl alcohol and polyvinylpyrrolidone; the lengths of the first curved portion (100), the second curved portion (200) and the third curved portion (300) decrease in sequence; the transverse arrangement densities of the fishbone etching portions (400) of the first curved portion (100), the second curved portion (200) and the third curved portion (300) gradually increase; and the method comprises the following steps: S1: deepening the catheter and arranging the fishbone etching portion (400) of the first curved portion (100) at a bending position. ​ ​ ​ ​ ​ 2. The asymmetrically laser etched gradient thin walled catheter of claim 1, wherein: ​ 3. The asymmetrically laser etched gradient thin walled catheter of claim 1, wherein: ​ 4. The asymmetrically laser etched gradient thin walled catheter of claim 1, wherein: ​ 5. The asymmetrically laser etched gradient thin walled catheter of claim 1, wherein: ​ 6. The asymmetrically laser etched gradient thin walled catheter of claim 1, wherein: ​ 7. The asymmetrically laser etched gradient thin walled catheter of claim 6, wherein: ​ 8. A controllable method of asymmetrically laser-etched gradient thin-walled catheter based on the asymmetrically laser-etched gradient thin-walled catheter of any one of claims 1-7, characterized in that, ​ ​ S2: continue to deepen the conduit with the side of the fishbone etching part (400) facing the area to be bent, and the fishbone etching part (400) of the first bending part (100) is deformed and bent through the area to be bent; S3: continue to deepen the conduit and rotate the conduit so that the side of the fishbone etching part (400) of the second bending part (200) faces the area to be bent; S4: repeat the operation to reach the designated area.

9. The controllable method of asymmetrically laser etching a gradient thin-walled guide tube according to claim 8, characterized in that: The required bending degree and the size of the external force applied are positively correlated.

Images