CN120884797A - Asymmetric laser etching gradient thin-walled conduit and its controllable method - Google Patents
Asymmetric laser etching gradient thin-walled conduit and its controllable methodInfo
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- CN120884797A CN120884797A CN202511366917.8A CN202511366917A CN120884797A CN 120884797 A CN120884797 A CN 120884797A CN 202511366917 A CN202511366917 A CN 202511366917A CN 120884797 A CN120884797 A CN 120884797A
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Abstract
The invention discloses an asymmetric laser etching gradient thin-wall catheter and a controllable method thereof, wherein a first bending part, a second bending part and a third bending part adopt a wall thickness increasing structure, so that the overall flexibility of the catheter is maintained, the supporting force of the tail end is obviously enhanced, the fishbone etching part is distributed along the same horizontal plane, a directional reinforcing structure is formed on the side wall of the catheter through an asymmetric etching process, the head end of the catheter is easier to pass through a complex vascular path, the bending resistance of the near end is improved, the flexibility and rigidity requirements are effectively balanced, the risk of vascular injury is further reduced, the operating stability in operation is improved, the axial bending flexibility is reserved, the radial kink resistance is obviously enhanced, the catheter is easier to conform to the trend of blood vessels in the pushing process, the fracture risk caused by local stress concentration is avoided, the accuracy and the safety of interventional operation are finally improved, and the defect that the catheter is unbalanced due to the rigidity and bending performance in the prior art is solved.
Description
Technical Field
The invention relates to the technical field of catheters, in particular to an asymmetric laser etching gradient thin-wall catheter and a controllable method thereof.
Background
In the field of interventional medicine, in particular to complex surgical scenes such as chronic total occlusion lesions (CTO) of coronary arteries, peripheral arterial diseases, neurovascular interventions and the like, the traditional catheter often faces a technical bottleneck that both rigid supporting force and bending flexibility are difficult to consider. When a catheter needs to traverse a tortuous vascular path which is tens of centimeters long, an operator often falls into two difficult dilemmas, namely, if the catheter is insufficient in rigidity, buckling deformation is easy to occur due to vascular resistance in the pushing process, so that an instrument cannot reach a target position, and if the rigidity is excessively strengthened, when the catheter passes through a vascular bifurcation or angulation lesion, the risk of tearing or perforation of an intima of a blood vessel is caused due to insufficient deformation capability. This contradiction is particularly pronounced when dealing with calcified lesions, tandem stenosis or highly twisted vascular anatomy, leading directly to reduced surgical success rates, prolonged procedure times and increased incidence of complications.
In CTO intervention, the catheter needs to have sufficient axial rigidity after passing through the occlusion segment to maintain the stability of the passageway and prevent the failure of advancing due to hematoma compression or plaque hardness, while the catheter head end is required to be capable of fitting the trend of the blood vessel with low resistance deformation when passing through the blood vessel bending segment, so as to avoid mechanical stimulation to the fragile intima. Traditional catheters are limited by limitations of material characteristics and structural design, and such dynamic performance switching is difficult to achieve on a single instrument, so that catheters with different characteristics often need to be repeatedly replaced during operation, and the complexity of the operation and the radiation exposure risk are obviously increased.
Accordingly, there is a need for improvements in catheters in the art.
Disclosure of Invention
The invention overcomes the defects of the prior art and provides an asymmetric laser etching gradient thin-wall catheter and a controllable method thereof.
In order to achieve the purpose, the technical scheme adopted by the invention is that the asymmetric laser etching gradient thin-wall catheter comprises a first bending part, a second bending part and a third bending part which are sequentially connected, and is characterized in that:
a first through hole is formed in the first bending part;
A second through hole and a third through hole are respectively arranged in the second bending part and the third bending part, and the second through hole is respectively communicated with the first through hole and the third through hole;
Connecting parts are respectively arranged between the first bending part and the second bending part and between the second bending part and the third bending part, and the wall thicknesses of the first bending part, the second bending part and the third bending part are sequentially increased;
The side edges of the first bending part, the second bending part and the third bending part are respectively provided with a fishbone etching part, and a plurality of fishbone etching parts are all arranged on the same horizontal plane.
In a preferred embodiment of the present invention, the first bending portion, the second bending portion and the third bending portion are coaxially disposed.
In a preferred embodiment of the present invention, the wall thicknesses of the first, second and third curved portions are 0.1-0.15mm, 0.2-0.25mm and 0.25-0.3mm, respectively.
In a preferred embodiment of the present invention, the first bending portion, the second bending portion and the third bending portion are made of the same material, and the material is one of stainless steel and nickel-titanium alloy.
In a preferred embodiment of the present invention, the fishbone etched portion of the second bending portion and the fishbone etched portion of the first bending portion are disposed on different sides, and the fishbone etched portion of the third bending portion, the first bending portion and the fishbone etched portion are disposed on the same side.
In a preferred embodiment of the present invention, the first bending portion, the second bending portion and the third bending portion are respectively provided with a coating, the first bending portion coating and the second bending portion coating are hydrophobic coatings, one of polytetrafluoroethylene and silicone is used as a material, and the third bending portion coating is a hydrophilic coating, and one of polyurethane, polyvinyl alcohol and polyvinylpyrrolidone is used as a material.
In a preferred embodiment of the present invention, the lengths of the first curved portion, the second curved portion and the third curved portion decrease.
In a preferred embodiment of the present invention, the transverse arrangement density of the fish bone etched portions of the first curved portion, the second curved portion and the third curved portion is gradually increased.
In order to achieve the aim, the second technical scheme adopted by the invention is that the controllable method of the asymmetric laser etching gradient thin-wall catheter is based on the asymmetric laser etching gradient thin-wall catheter and comprises the following steps:
S1, deep the guide pipe, and arranging the fishbone etching part of the first bending part at a part to be bent;
s2, enabling the side edge of the fishbone etching part to face the area to be bent, continuing to penetrate into the guide pipe, and enabling the fishbone etching part of the first bending part to deform and bend to pass through the area to be bent;
S3, continuing to extend into the guide pipe and rotating the guide pipe to enable the side edge of the fishbone etching part of the second bending part to face the area to be bent;
S4, repeating the operation to reach the designated area.
In a preferred embodiment of the present invention, the degree of bending required and the magnitude of the applied force are controlled to be in positive correlation.
The invention solves the defects existing in the background technology, and has the following beneficial effects:
(1) The invention provides an asymmetric laser etching gradient thin-wall catheter, wherein the first, second and third bending parts adopt a wall thickness increasing structure, so that the supporting force of the tail end of the catheter is obviously enhanced while the overall flexibility of the catheter is maintained, the fishbone etching part is distributed along the same horizontal plane, an orientation reinforcing structure is formed on the side wall of the catheter through an asymmetric etching process, compared with the catheter in the prior art, the head end of the catheter is easier to pass through a complex vascular path, and the bending resistance of the near end is improved, the structure makes the catheter more easily conform to the trend of blood vessels in the pushing process, avoids the fracture risk caused by local stress concentration, and finally improves the accuracy and safety of interventional operation, and solves the defect that the catheter in the prior art is unbalanced due to rigidity and bending performance.
(2) In the invention, the combination of the coaxial arrangement and the gradient wall thickness structure, the design of increasing wall thickness of each bending part is matched with the coaxial arrangement, so that breakthrough is realized in the anti-kink performance of the catheter.
(3) According to the invention, the fishbone etching part is distributed along the same horizontal plane, the directional reinforcing structure is formed on the side wall of the catheter through the asymmetric etching process, the head end of the catheter is easier to pass through a complex vascular path, and the bending resistance of the proximal end is improved.
(4) In the invention, the fusion design of the fishbone etching structure and the gradient wall thickness fully plays the mechanical potential of materials, 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 the density of fishbone etching are precisely controlled, the radial supporting force of the catheter is remarkably enhanced, the axial flexibility is maintained, the application range of the catheter in high-resistance environments such as calcified lesions is further expanded, and the customized improvement of the performance of the interventional instrument is realized.
(5) In the invention, the synergistic effect of single material selection and gradient wall thickness design ensures that the catheter obtains breakthrough balance between biocompatibility and processing feasibility, and compared with the prior art, the super-elastic characteristic of the nickel-titanium alloy is combined with the wall thickness structure with gradually increased gradient, and the characteristic ensures that the catheter can keep the head end in a complex vascular path to be flexibly attached, can provide stable support through a thickening section, and obviously improves the pushing smoothness in tortuous vessels.
(6) In the invention, the design of reverse matching of the length gradient of the bending part and the etching density gradient forms a progressive mechanical transition area. The first bending part flexible deformation area and the third bending part 300 rigid support area realize smooth transition through the second bending part, compared with the prior art, the pushing force fluctuation of the catheter in a tortuosity path is remarkably reduced, the perception precision of a worker on the position of the head end of the catheter is further optimized, and particularly when bifurcation lesions are treated, the alternating control of a main branch vessel and a side branch vessel can be realized without frequent replacement of the instrument.
(7) In the present invention, the degree of bending required and the magnitude of the applied external force are controlled to be in positive correlation. By establishing a linear association mechanism of the bending degree and the external force application amount, the precise quantitative control of the interventional operation is realized, compared with the prior art, the deformation amplitude of the catheter can be predicted through visual force feedback, the navigation accuracy in a complex path is remarkably improved, the vascular perforation risk caused by excessive force application is effectively reduced, and the advantage is remarkable especially when high-risk scenes such as coronary artery chronic total occlusion lesions are treated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art;
FIG. 1 is a perspective view of a preferred embodiment of the present invention;
FIG. 2 is a top view of a preferred embodiment of the present invention;
FIG. 3 is a side view of a preferred embodiment of the present invention;
In the figure, 100 parts of the first bending part, 200 parts of the second bending part, 300 parts of the third bending part and 400 parts of the fish bone etching part.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.
In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the scope of the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may include one or more of the feature, either explicitly or implicitly. In the description of the application, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present application, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected via an intermediate medium, or in communication between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art in a specific case.
The technical platform with continuously adjustable rigidity-flexibility is constructed through innovative integration of gradient wall thickness design, fish bone etching structure optimization and controllable deformation methods. The full-path intervention requirement from the large-angle turning of the aortic arch to the tiny branches at the distal end of the coronary artery by using the field Jing Fu cover is particularly suitable for complex operations needing to combine long-distance pushing force and multi-plane bending adaptability. For example, in peripheral arterial intervention, when the catheter needs to pass through iliac bifurcation and abdominal aortic bending from femoral artery in a retrograde manner, the technology can ensure that the proximal rigid section provides stable support, the distal compliant section realizes noninvasive passing, fundamentally solves the performance fault problem that the traditional catheter is too hard or too soft, and provides a revolutionary solution for high-difficulty interventional treatment.
As shown in fig. 1 and 2, an asymmetric laser etching gradient thin-walled catheter includes a first bending portion 100, a second bending portion 200 and a third bending portion 300 connected in sequence, wherein:
The first bending part 100 is provided with a first through hole inside;
The inside of the second bending part 200 and the third bending part 300 are respectively provided with a second through hole and a third through hole, the second through holes are respectively communicated with the first through hole and the third through hole, connecting parts are respectively arranged between the first bending part 100 and the second bending part 200 and between the second bending part 200 and the third bending part 300, the wall thicknesses of the first bending part 100, the second bending part 200 and the third bending part 300 are sequentially increased, the continuous design of the three-section through holes constructs an unobstructed inner cavity channel, the outer diameter optimization caused by the gradient wall thickness is combined, the fluid resistance is reduced compared with the traditional sectional through hole structure, the drug delivery efficiency or the device passing performance is improved, the thrombosis risk is effectively reduced, the release uniformity of treatment substances is optimized, a more reliable solution is provided for complex interventional treatment, and the three-section through hole type drug delivery device is particularly suitable for high-precision drug delivery or device exchange requirements.
As shown in fig. 3, the sides of the first bending part 100, the second bending part 200 and the third bending part 300 are respectively provided with a fishbone etching part 400, and a plurality of fishbone etching parts 400 are all disposed on the same horizontal plane.
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 tail end supporting force is obviously enhanced while the overall flexibility of the catheter is maintained, the fishbone etching part 400 is distributed along the same horizontal plane, a directional reinforcing structure is formed on the side wall of the catheter through an asymmetric etching process, the head end of the catheter is easier to pass through a complex vascular path, the bending resistance of the near end is improved, the flexibility and rigidity requirements are effectively balanced, the risk of vascular injury is further reduced, the operating stability in operation is improved, the axial bending flexibility is reserved, the radial kink resistance is obviously enhanced, the catheter is easier to conform to the trend of the blood vessel in the pushing process by adopting the structure, the fracture risk caused by local stress concentration is avoided, the accuracy and the safety of an interventional operation are finally improved, and the defect that the catheter is unbalanced due to the rigidity and the bending performance in the prior art is solved.
The first bending part 100, the second bending part 200, and the third bending part 300 are coaxially disposed. The asymmetric laser etching gradient thin-wall catheter is designed through the structure of the coaxial arrangement of the first bending part 300, the second bending part 300 and the third bending part 300, so that the axial stability is remarkably improved, the coaxial characteristics ensure that each section of the catheter keeps high concentricity during bending or torsion, the design effectively disperses external stress, the pushing of the catheter in a complex vascular path is more accurate, and the risk of surgical complications is further reduced.
The combination of the coaxial arrangement and the gradient wall thickness structure enables the catheter to break through in anti-kink performance. The design of increasing wall thickness of each bending part is matched with coaxial layout, and the catheter can be uniformly dispersed and deformed when bearing lateral pressure, so that local folds or collapse are remarkably reduced, and the real-time control precision of a worker on the head end of the catheter is further improved.
The fusion of the coaxial characteristics of the three bending parts and the design of the continuous through hole optimizes the hydrodynamic performance of the inner cavity of the catheter, and the coaxial structure ensures that the axes of the through holes are completely overlapped.
The wall thicknesses of the first, second and third curved portions 100, 200 and 300 are 0.1-0.15mm, 0.2-0.25mm and 0.25-0.3mm, respectively. Through the design that the wall thickness of the first, the second and the third bending parts 300 gradually increases according to the gradient of 0.1-0.15mm, 0.2-0.25mm and 0.25-0.3mm, the precise balance of flexibility and supporting force is realized. The ultra-thin wall thickness of the first bend 100 imparts superior axial compliance, which feature makes the catheter tip more prone to conform to the natural curved path of the vessel, significantly reducing mechanical irritation to the intima of the vessel, further enhancing passability through complex anatomy.
The cooperation of the gradient wall thickness structure and the coaxial arrangement ensures that the catheter realizes breakthrough optimization in anti-kink performance. The design of the wall thickness of the third bending part 300 increased to 0.25-0.3mm effectively improves the flexural strength of the proximal end of the catheter, remarkably reduces local collapse caused by external force compression in the pushing process, further ensures the integrity of an inner cavity passage and provides a reliable structural foundation for the crossing of high-resistance lesions.
The fusion design of the fish bone etching structure and the gradient wall thickness fully plays the mechanical potential of the material. The thicker wall thickness of the third bending part 300 provides a larger processing window for the etching process, the characteristic enables the depth and the density of fish bone etching to be accurately controlled, the radial supporting force of the catheter is remarkably enhanced, meanwhile, the axial flexibility is maintained, the application range of the catheter in high-resistance environments such as calcification lesions is further expanded, and the customized improvement of the performance of the interventional instrument is realized.
The first bending part 100, the second bending part 200 and the third bending part 300 are identical in material, and the material is one of stainless steel and nickel-titanium alloy. By adopting the first, second and third bending parts 300 made of uniform stainless steel or nickel-titanium alloy materials, the deep optimization of the mechanical properties of the structure is realized. The material consistency characteristics ensure that each section of the catheter presents uniform stress response characteristics when being bent or twisted, the design effectively avoids the phenomenon of stress concentration which is easy to generate at the joint of multiple materials, remarkably improves the integral fatigue resistance of the catheter, further prolongs the service life of the instrument and reduces the probability of accidental occurrence in operation.
The synergistic effect of single material selection and gradient wall thickness design ensures that the catheter has breakthrough balance between biocompatibility and processing feasibility, and the super-elastic characteristic of the nickel-titanium alloy is combined with the wall thickness structure with gradually increased gradient.
The fusion of the material consistency characteristic and the fish bone etching process fully releases the mechanical potential of the material. The high rigidity characteristic of stainless steel is matched with a directional etching structure, so that the catheter can maintain the axial compression resistance, meanwhile, controllable radial flexibility is realized through an etching area, the crossing capability of the catheter in calcification lesions is remarkably enhanced, the adaptability of the interventional instrument to complex lesion environments is further improved, and the accurate matching of structural functions and material characteristics is realized.
The fishbone etched portion 400 of the second bending part 200 is disposed at a different side from the fishbone etched portion 400 of the first bending part 100, and the fishbone etched portion 400 of the third bending part 300 is disposed at the same side as the first bending part 100 and the fishbone etched portion 400. Through the design of the opposite side layout of the fishbone etching part 400 of the second bending part 200 and the first and third bending parts 300, the precise regulation and control of the bending characteristics of the three-dimensional space is realized. The feature enables the second bending portion 200to form a directional compliant region through the heterolateral etching structure in the axial pushing process of the catheter, so that the self-adaptive capacity of the catheter in a composite bending path is remarkably improved, and the accurate steering performance of the vascular bifurcation is further optimized.
The third bending part 300 and the first bending part 100 are etched by the fishbone and are arranged on the same side, so that a mechanical memory effect of the tail end of the catheter is constructed, the same-side etching structure can form a consistent bending tendency when the head end of the catheter exits from the guiding catheter, the morphological stability of the catheter in place is remarkably enhanced, the scraping risk of the vascular wall is further reduced, and a reliable guarantee is provided for accurately positioning the stent to release.
The combined features of the second bend 200 etch on opposite sides and the third bend 300 etch on the same side form a torsion compensation mechanism for the middle section of the catheter. When the catheter is twisted by external force, the different-side etching area can absorb torque through differential deformation, and the same-side area keeps axial continuity, so that torsion hysteresis is remarkably reduced, synchronism of hand actions of operators and response of the head end of the catheter is further improved, and more efficient control experience is provided for interventional treatment of complex long lesions.
The first bending part 100, the second bending part 200 and the third bending part 300 are respectively provided with a coating, the first bending part 100 coating and the second bending part 200 coating are hydrophobic coatings, one of polytetrafluoroethylene and silicone is used as a material, and the third bending part 300 coating is a hydrophilic coating, and one of polyurethane, polyvinyl alcohol and polyvinylpyrrolidone is used as a material. Through the differential design that the first bending part 200 and the second bending part 200 adopt hydrophobic coatings and the third bending part 300 adopt hydrophilic coatings, the precise regulation and control of the whole-process friction characteristic of intervention is realized. The hydrophobic coatings of the first and second curved portions 200 form a low surface energy interface in a dry state, which feature significantly reduces direct friction with the intima of the vessel during initial pushing of the catheter, reduces resistance to advancement in tortuous paths, and further optimizes immediate feedback of operator hand operation.
The hydrophilic coating of the third bend 300 in conjunction with the increased wall thickness creates an intelligent lubrication system for the catheter tip. When the area contacts blood, the hydrophilic coating absorbs water rapidly to form a gel-like lubricating layer, friction fluctuation in the stent conveying process is obviously reduced, stability of the precise instrument when passing through calcified lesions is further guaranteed, meanwhile, the combination of the hydrophilic coating and the thickening wall provides enough radial supporting force for the tail end, and dynamic balance of flexibility and pushing force is achieved.
The fusion design of the hydrophobic-hydrophilic segmented coating system and the fishbone etching structure fully releases the performance boundary of the surface modification technology. The hydrophobic coating of the first and second bending parts 200 can effectively prevent nonspecific adsorption of blood components in the etched grooves, while the hydrophilic coating of the third bending part 300 enhances the adhesion stability of therapeutic drugs in the etched areas through hydrogen bonding, remarkably improves the functional durability of the catheter in complex interventional procedures, further expands the application potential of the drug eluting catheter in long-term surgery, and realizes double optimization of mechanical properties and biological functions.
The lengths of the first, second and third curved portions 100, 200 and 300 decrease and the lateral arrangement density of the fish bone etched portion 400 increases gradually. Through the collaborative design of the decreasing length of the first, second and third bending parts 300 and the increasing transverse density of the fishbone etching, the precise optimization of the adaptability of the intervention path is realized. The longer structure of the first bending portion 100 combines with the low-density etching feature, so that the catheter head end can keep low-resistance deformation when being bent at a large angle through an aortic arch and the like, the mechanical stimulation to the vascular intima is remarkably reduced, and the initial trafficability in a complex anatomical structure is further improved.
The fusion of the shorter structure of the third bend 300 with the high density etched features creates a reinforced support system for the catheter tip. The high-density fishbone etching forms a dense grid structure at the shortened bending section, so that the radial supporting force of the catheter head end when passing through calcification lesions is obviously enhanced, the accurate release of devices such as a bracket is further ensured, meanwhile, the terminal redundancy is reduced due to the shorter length design, and a more direct control path is provided for deep vascular intervention.
The design of reverse matching of the length gradient of the bending part and the etching density gradient forms a progressive mechanical transition zone. Smooth transition is realized between the flexible deformation region of the first bending part 100 and the rigid support region of the third bending part 300 through the second bending part 200, so that pushing force fluctuation of the catheter in a tortuous path is remarkably reduced, the perception precision of a user on the position of the head end of the catheter is further optimized, and particularly when a bifurcation lesion is treated, the alternating operation of a main branch and a side branch blood vessel can be realized without frequent replacement of the instrument.
A controllable method for an asymmetric laser etching gradient thin-wall catheter is based on the asymmetric laser etching gradient thin-wall catheter and comprises the following steps:
S1, deep the catheter, and arranging the fishbone etching part 400 of the first bending part 100 at the position to be bent;
S2, the side edge of the fishbone etching part 400 is directed to the area to be bent and continues to penetrate into the catheter, the fishbone etching part 400 of the first bending part 100 deforms and bends to pass through the area to be bent, the operation characteristics of the initial bending area are aligned to the side edge of the fishbone etching part 100, the flexible deformation capability of the etching structure in a specific direction is fully utilized, the head end of the catheter can pass through the first tortuosity section with minimum resistance, the risk of damage to the vascular intima is obviously reduced, and the advantages are obvious especially when large-angle bending such as aortic arch is processed.
And S3, continuing to go deep into the guide pipe and rotating the guide pipe to enable the side edge of the fishbone etching part 400 of the second bending part 200 to face the area to be bent, and rotating the guide pipe to enable the fishbone etching side edge of the second bending part 200 to be aligned with the operation characteristics of the subsequent bending area, so that a progressive mechanical adaptation mechanism is constructed. By axially rotating and activating the etching deformation areas of different bending parts, continuous self-adaption of the catheter in the composite bending path is realized, the operation time is greatly shortened, radiation exposure is reduced, and the method has the advantage of high efficiency in series lesion interventional therapy.
S4, repeating the operation to reach the designated area. The whole set of controllable method cooperates with the gradient wall thickness of the catheter and the etching characteristics of the opposite sides to form a closed-loop control system for three-dimensional space navigation. In the repeated operation of the step S4, the wall thickness increasing structure provides axial supporting force guarantee for continuous bending, the directional deformation of the fishbone etching ensures radial flexibility, the path controllability of the catheter in a complex anatomical structure is obviously improved, the application boundary of high-difficulty interventional operation is further expanded, and an innovative solution is provided for opening coronary chronic total occlusion lesions.
The required bending degree and the magnitude of the applied external force are controlled to be in positive correlation. By establishing a linear correlation mechanism of the bending degree and the external force application amount, the precise quantitative control of the interventional operation is realized. The characteristic enables an operator to pre-judge the deformation amplitude of the catheter through visual force feedback, obviously improves the navigation accuracy in a complex path, effectively reduces the vascular perforation risk caused by excessive force application, and has obvious advantages especially when treating high-risk scenes such as coronary artery chronic total occlusion lesions and the like.
The gradual deformation control model is constructed, when the catheter passes through a tortuous blood vessel, a user can gradually increase pushing force to realize controllable bending, instantaneous stress impact born by the blood vessel wall is obviously reduced, the passing safety of a fragile blood vessel section is further optimized, and a milder intervention solution is provided for old patients or cases of hypoelasticity of the blood vessel.
The control method and the gradient wall thickness of the catheter and the fishbone etching structure cooperate to form a closed-loop optimization system of mechanical properties. The bending process driven by external force is converted into controllable axial supporting force through the wall thickness increasing structure, and the directional deformation of the fishbone etching ensures the accurate guiding of radial bending, thereby remarkably enhancing the penetrating capacity of the catheter in high-resistance environments such as calcified lesions, further expanding the technical boundary of interventional therapy of complex lesions and realizing the deep matching of the performance of the instrument and clinical requirements.
The above-described preferred embodiments according to the present invention are intended to suggest that, from the above description, various changes and modifications can be made by the person skilled in the art without departing from the scope of the technical idea of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.
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