CN115363832A - Spring stent, stent catheter system and stent implantation method - Google Patents

Abstract

The application relates to the technical field of medical instruments, in particular to a spring support, a support catheter system and a support implanting method. The spring support provided by the invention comprises a clockwork spring, wherein the clockwork spring comprises a cylindrical structure, the cylindrical structure comprises a hollow cylinder in which a memory alloy silk screen is circularly and spirally wound, the memory alloy silk screen is kept flush at two ends of the hollow cylinder, and the side wall of the clockwork spring is of a hollow structure. Spring bracket in this application can realize self-expanding abduction in the blood vessel, effectively laminates with the vascular inner wall, and can follow hematal shrink and expansion according to memory elasticity and carry out elastic deformation to reach good adherence effect. The cutting assembly is connected with the distal end of the pushing assembly, so that the diseased region in the blood vessel can be cut in the implantation process of the stent, the reliability of the adherence of the stent is enhanced, and the risks of new thrombosis and neointimal hyperplasia are reduced.

Description

Spring stent, stent catheter system and stent implantation method

Technical Field

The application relates to the technical field of medical instruments, in particular to a spring support, a support catheter system and a support implanting method.

Background

The intravascular stent can be divided into a self-expanding type and a balloon expanding type according to the expansion mode in the blood vessel, wherein the self-expanding type can be expanded in the blood vessel, and the balloon expanding type has no elasticity and is attached to the blood vessel by expanding to a certain diameter by the balloon.

The latter is the majority of the stents on the market, and most of the balloon expandable metal stents at present have only conventional sizes to choose from, and doctors can only try to predict which stent size is just suitable for keeping the vessel open. But each individual's blood vessels are different and the final effect is completely dependent on the experience of each doctor.

Secondly, due to the elasticity of the blood vessel, when the blood vessel contracts and expands, the inner diameter of the blood vessel wall changes correspondingly, and the size of the balloon expandable metal stent is fixed after being supported in the blood vessel. This may result in stent malapposition which affects blood flow patterns and artery healing, leading to an increased risk of new thrombosis and neointimal hyperplasia.

In addition, when the self-expanding stent is implanted, the outer surface of the self-expanding stent is difficult to be completely attached to the inner wall of the blood vessel due to the existence of a lesion part on the inner wall of the blood vessel, so that the implantation stability of the self-expanding stent in the blood vessel is difficult to be ensured.

Disclosure of Invention

The application aims to provide a spring support, a support catheter system and a support implanting method, wherein the support is endowed with a function of freely contracting and expanding through a self-expanding spring support, so that a blood vessel drives the spring support to freely contract and expand during diastole and contraction, and a good adherence effect between the support and the blood vessel is kept.

In order to achieve the above object, in a first aspect, the present invention provides a spring support, including a power spring, where the power spring includes a cylindrical structure, the cylindrical structure includes a hollow cylinder around which a memory alloy wire mesh is spirally wound, the memory alloy wire mesh is kept flush at two ends of the hollow cylinder, and a side wall of the power spring is a hollow structure.

In an alternative embodiment, the memory alloy comprises nitinol, and the spring is made of a rectangular wire mesh of nitinol and is scalable in the radial direction of the hollow cylinder.

In an alternative embodiment, the spring comprises a contracted state and an expanded state, the hollow cylinder has a diameter of 0.4 to 5mm in the contracted state and the hollow cylinder has a diameter of 0.8 to 10mm in the expanded state.

In a second aspect, the invention provides a stent catheter system, which includes the spring stent described in any one of the foregoing embodiments, and a stent delivery device, where the stent delivery device includes a catheter and a pushing assembly that can be extended and retracted back and forth relative to the catheter, the pushing assembly is used to push out the spring stent from the catheter and implant the spring stent into a blood vessel, and a cutting assembly is connected to a distal end of the pushing assembly and is used to cut a lesion site in the blood vessel before the spring stent is implanted.

In an alternative embodiment, a push-pull tube is arranged inside the guide tube, the push assembly comprises two limiting discs connected to the push-pull tube, and the spring support in a compressed state is arranged in the guide tube and located between the limiting discs.

In an optional embodiment, a movable rod penetrates through the interior of the push-pull pipe, the limiting disc comprises a proximal limiting disc and a distal limiting disc, the cutting assembly comprises a blade connected between the movable rod and the distal limiting disc, and the blade is made of nickel-titanium alloy.

In an alternative embodiment, the blade includes a plurality of prismatic blades, the prismatic blades are uniformly distributed at intervals in the circumferential direction of the distal end limiting disc, one end of each prismatic blade is connected to the outer edge of the distal end limiting disc, and the other end of each prismatic blade centrally crosses the distal end of the movable rod.

In optional embodiment, the movable rod movably alternates in the push-pull tube, and can be relative stretch out and draw back around the distal end opening of push-pull tube, the movable rod with be provided with the sealing washer between the push-pull tube, the movable rod includes solid construction's nickel titanium alloy stick.

In an optional embodiment, a limit stop is arranged on the outer wall of the movable rod, the limit stop can be matched and clamped with a near-end pipe orifice of the push-pull pipe, and a developing ring is arranged on the part, corresponding to the telescopic part of the push-pull pipe, of the movable rod;

push away the trombone slide including supplying the main part chamber that the activity of movable rod alternated and the wire guide chamber that supplies the seal wire cross-under, the main part chamber runs through in whole push away the trombone slide, the distal end opening in wire guide chamber sets up the distal end of push away the trombone slide.

In a third aspect, the present invention also provides a stent implantation method performed by the stent catheter system according to the previous embodiment, comprising the steps of:

delivering the catheter, the stent delivery device and the spring stent compressed in the catheter to a lesion part along the guide wire;

cutting the lesion part through a cutting assembly at the distal end of the pushing assembly;

pushing the compressed spring stent out of the catheter to expand the spring stent radially;

the expansion of the spring support is jointed with the inner wall of the blood vessel and self-shrinks along with the contraction and the expansion of the blood vessel;

and withdrawing the catheter and the stent conveying device to complete the implantation of the stent.

Through the spring bracket of clockwork spring form in this application, can realize self-expanding abduction in the blood vessel, effectively laminate with the blood vessel inner wall, and can follow hematal shrink and expansion according to memory elasticity and carry out elastic deformation to reach the good adherence effect of support and blood vessel.

The cutting assembly is connected with the distal end of the pushing assembly, so that the diseased region in the blood vessel can be cut in the implantation process of the stent, the reliability of the adherence of the stent is enhanced, and the risks of new thrombosis and neointimal hyperplasia are reduced.

The stent implanting method can reliably push the spring stent out of the catheter through the pushing assembly, so that the spring stent is self-expanded from a compressed state in the catheter to an extended state entering a blood vessel, and lesion tissues of a lesion part are effectively cut, thereby ensuring the reliable implantation of the spring stent in the blood vessel and the stable matching with the blood vessel in subsequent application, and greatly improving the medical effect which can be achieved by the conventional stent.

Additional features and advantages of the present application will be described in detail in the detailed description which follows.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

FIG. 1 is a schematic view of the spring support in a contracted state;

FIG. 2 is a schematic view of the spring support of the present application in an extended position;

FIG. 3 is a schematic structural view of a stent catheter system of the present application;

FIG. 4 is a schematic view of the stent catheter system of the present application in a state of cutting a lesion;

FIG. 5 is a schematic view of the stent catheter system of the present application during stent deployment;

FIG. 6 is a schematic view of the stent catheter system during withdrawal in the present application;

fig. 7 is a diagram illustrating the fit relationship between the movable rod and the guide wire and the push-pull tube.

Icon:

1-a spring support; 11-a clockwork spring;

2-a catheter; 21-pushing and pulling the tube; 22-a movable rod; 23-a developing ring; 24-a body cavity; 25-a guidewire lumen; 26-a sealing ring;

3-a pushing assembly; 31-a proximal end limiting disc; 32-a distal limit disc;

4-a cutting assembly; 41-a blade;

5-limit stop block;

6-blood vessel;

7-guide wire.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, 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. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

In the description of the present application, it should be noted that the terms "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the application usually place when using, and are only used for convenience in describing the present application and simplifying the description, but do not indicate or imply that the devices or elements that are referred to must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

In the description of the present application, it should also be noted that, unless expressly stated or limited otherwise, the terms "disposed" and "connected" are to be construed broadly, and may for example be fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

Spring support 1 and support pipe system in this application, the implantation of mainly used self-expanding support in blood vessel 6 to realize the effective laminating with blood vessel 6 inner wall through self-memory elasticity, and make spring support 1 follow the shrink and the relaxation of blood vessel 6 and carry out deformation, with the adherence effect of reinforcing support and blood vessel 6.

Meanwhile, the memory elasticity of the spring support 1 can be more suitable for blood vessels 6 of different patients, the matching degree of the spring support 1 and the blood vessels 6 is enhanced, the uncertainty that the conventional support is suitable for keeping the blood vessels 6 open in size is abandoned, and the subjective factors judged by doctors with experience are avoided.

Referring to fig. 1 to 2, the spring supporter 1 according to the present invention includes a power spring 11, and particularly, the power spring 11 includes a certain length and forms a cylindrical structure after being bent and heat-treated to be shaped, wherein the cylindrical structure includes a hollow cylinder formed by circling a memory alloy wire net, and the spring supporter 1 made of the memory alloy wire net having memory elasticity has good elasticity and is capable of self-expanding and self-contracting in a change of a bound space.

Keep the parallel and level at hollow section of thick bamboo both ends through the memory alloy silk screen, can form the stable tubular structure of spring support 1, keep in the reliable deformation of radial flexible, make the elastic memory deformation of support and the radial elasticity of blood vessel 6 keep unanimous, can make spring support 1 and blood vessel 6 synchronous deformation when the relaxation of blood vessel 6 contracts, keep good adherence effect.

The side wall of the clockwork spring 11 is of a hollow structure, and the surface of the clockwork spring can be hollow into various geometric figures so as to enhance the plastic deformation effect of the spring support 1.

In one specific embodiment, the memory alloy is preferably made of nickel-titanium alloy, and the clockwork spring 11 is made of a rectangular nickel-titanium alloy wire mesh coiled and can be radially and automatically contracted and contracted along the hollow cylinder, so that the spring support 1 can be matched with the blood vessel 6 to be elastically deformed along with the relaxation and contraction of the blood vessel 6 in real time, and the support and the blood vessel 6 can form a reliable wall attaching effect.

In the manufacturing process of the clockwork spring 11 in this embodiment, the width direction of the rectangular nickel-titanium alloy wire mesh is used as the winding direction, and the length direction of the rectangular nickel-titanium alloy wire mesh forms the axial direction of the spring support 1, so that the spring support 1 can deform in the radial direction, and the stability and reliability of the memory elasticity of the spring support 1 in the radial direction are ensured by combining the manufacturing material of the nickel-titanium alloy.

The spring 11 comprises a contracted state and an expanded state, and can be deformed in real time in the catheter 2 and the implanted blood vessel 6 during the delivery process, and preferably, the diameter of the hollow cylinder in the contracted state is 0.4-5mm, and the diameter of the hollow cylinder in the expanded state is 0.8-10mm. Can be implanted into an arterial vessel 6 in a satisfactory manner, and can be attached to the inner wall of the vessel 6 in a satisfactory manner while freely following the transition between the dilated and contracted states of the vessel 6.

With reference to fig. 3, based on the structure of the spring support 1, the present invention further provides a stent catheter system for delivering and implanting the spring support 1, which comprises the spring support 1 and a stent delivery device.

Specifically, the stent delivery device comprises a catheter 2 and a pushing assembly 3 which can be extended and retracted back and forth relative to the distal end part of the catheter 2, and can accommodate the spring stent 1 in the catheter 2 and implant the spring stent 1 into the lesion part of the blood vessel 6 before the distal end of the catheter 2 reaches the lesion part. Further, the spring stent 1 can be reliably pushed out of the catheter 2 by the pushing assembly 3 and implanted into the blood vessel 6, and the effectiveness of delivery and implantation engagement of the spring stent 1 is maintained.

From the viewpoint of enhancing the good adherence of the spring support 1 and the blood vessel 6, the part of the spring support 1 implanted into the blood vessel 6 needs to keep relatively regular space of the lumen of the blood vessel 6. Cutting assembly 4 is connected through the distal end at propelling movement subassembly 3, can cut the pathological change position of blood vessel 6 before spring bracket 1 implants, makes the 6 inner walls of blood vessel keep the relatively regular smooth implantation situation to keep the effective laminating of the lateral wall of spring bracket 1 and the 6 inner walls of blood vessel, reinforcing blood vessel 6 and spring bracket 1's matching performance.

Specifically, the pushing component 3 performs pushing and pulling actions through the pushing and pulling tube 21 arranged inside the catheter 2, and the pushing and pulling tube 21 can stretch back and forth relative to the catheter 2, so that the spring support 1 is pushed out and implanted from the catheter 2, and the pushing component 3 is driven to retract after the spring support 1 is implanted.

Propelling movement subassembly 3 is including connecting two spacing dishes on push-and-pull pipe 21, and two equal fixed connection of spacing dish are on push-and-pull pipe 21's outer wall, and the interval between the spacing dish is greater than spring bracket 1's length. Spring holder 1 is in the compression state owing to receive the constraint of pipe 2 in the propelling movement implantation process, and spring holder 1 under the compression state sets up in pipe 2, and its lateral wall on the footpath keeps the relation of laminating with pipe 2 inner wall to be located between two spacing dishes.

During the normal delivery process of the spring support 1, the pushing assembly 3 and the cutting assembly 4 are both arranged inside the distal opening of the catheter 2, and the pushing tube 21 and the catheter 2 do not perform relative displacement, that is, the pushing assembly 3 does not change the position state of the spring support 1 and the cutting assembly 4 in the catheter 2.

The catheter 2, the spring support 1, the pushing assembly 3 and the cutting assembly 4 reach the lesion of the blood vessel 6 under the guiding action of the guide wire 7, and the cutting assembly 4 is connected to the distal end of the pushing assembly 3 and is arranged in the opening at the distal end of the catheter 2 before the catheter 2 reaches the lesion of the blood vessel 6.

Before the distal opening of the catheter 2 reaches the lesion of the blood vessel 6 and before the spring support 1 is implanted into the blood vessel 6, the lesion of the blood vessel 6 is first cut, specifically by the cutting assembly 4.

In another specific embodiment, the movable rod 22 penetrates through the push-pull tube 21, and the movable rod 22 can extend back and forth relative to the distal opening of the push-pull tube 21, the limiting disc comprises a proximal limiting disc 31 and a distal limiting disc 32 which are respectively connected to the push-pull tube 21, during the transportation process of the stent, the spring stent 1 is tightly attached to the inner wall of the catheter 2 under the constraint action of the catheter 2, and the proximal limiting disc 31 and the distal limiting disc 32 mainly limit the spring stent 1 in the catheter 2, so as to prevent the spring stent 1 from being separated from the catheter 2.

Meanwhile, the limiting disc can be driven by the push-pull tube 21 to stretch back and forth relative to the axial direction of the catheter 2 so as to push the spring support 1 to implant and withdraw the spring support 1 after being implanted.

In order to prevent blood from flowing backwards in the catheter 2 in the gap between the push-pull tube 21 and the movable rod 22, a sealing ring 26 is arranged between the movable rod 22 and the push-pull tube 21, and the sealing ring 26 is specifically a flexible rubber ring made of silicon rubber, so that the influence on the push-pull of the movable rod 22 in the push-pull tube 21 can be avoided on the premise of meeting the sealing requirement.

The cutting assembly 4 comprises a blade 41 connected between the far end of the movable rod 22 and the far end side face of the far end limiting disc 32, in the conveying process of the spring support 1, the catheter 2, the push-pull tube 21 and the movable rod 22 synchronously extend into the far end of the blood vessel 6 and keep a relative static relation in the axial direction, the far end opening of the movable rod 22 protrudes out of the far end opening of the push-pull tube 21, so that the blade 41 connected between the far end of the movable rod 22 and the far end limiting disc 32 keeps an inclined state, a conical cutter arranged in the catheter 2 is formed, lesion tissues entering the catheter 2 can be cut in the conveying process, and the smoothness of the push process is enhanced.

Referring to fig. 4, when it is required to cut a diseased region of a blood vessel 6, before reaching the diseased region, the distal insertion of the catheter 2 is stopped, the push-pull tube 21 is pushed distally to extend the cutting assembly 4 from the catheter 2, and the spring support 1 is moved forward under the push of the proximal limiting disc 31, and when the distal limiting disc 32 reaches the distal opening portion of the catheter 2, the blade 41 of the cutting assembly 4 is completely extended out of the catheter 2, the pushing of the push-pull tube 21 is stopped, and the movable rod 22 is pulled back.

Preferably, the movable rod 22 is pulled back to make the distal end of the movable rod 22 flush with the distal opening of the push-pull tube 21, the blade 41 connected between the distal end of the movable rod 22 and the distal limiting disc 32 is bent and deformed to form a petal-shaped cutting knife, and the lesion site in the blood vessel 6 is cut by changing the shape of the cutting blade 41. Preferably, the external diameter of petal form cutting knife is greater than pipe 2 external diameter and is less than the internal diameter of blood vessel 6, can cut the pathological change position on the blood vessel 6 inner wall completely, is convenient for spring support 1 and the abundant adherence of blood vessel 6 inner wall.

When the movable rod 22 is pulled back to the proper position and the blade 41 is warped and deformed, the petaloid cutting knife moves to the far end outside the catheter 2 to cut the lesion part by pushing the push-pull tube 21 and the movable rod 22 towards the far end, and the spring stent 1 is implanted into the blood vessel 6 from the catheter 2.

Referring to fig. 6 in conjunction with fig. 5, during implantation of the spring stent 1 from the catheter 2 into the blood vessel 6, since the diameter of the catheter 2 is smaller than the inner diameter of the blood vessel 6, the spring stent 1 moves towards the distal end of the catheter 2 in a relatively constrained compressed state and under the urging of the proximal limiting disk 31. When the proximal limiting disc 31 extends out of the distal opening of the catheter 2, the spring support 1 completely enters the blood vessel 6, and simultaneously, the spring support 1 is attached to the inner wall of the blood vessel 6 after the lesion part is cut, the spring support 1 is changed from a relatively compressed state in the catheter 2 to a relatively expanded state in the blood vessel 6, and the implantation of the spring support 1 in the lesion part is completed.

Based on the above mentioned outer diameter of the petal-shaped cutting knife being larger than the outer diameter of the catheter 2, in order to enable the cutting component 4 to be retracted into the catheter 2 along with the pushing component 3, after the implantation of the spring support 1 is completed, the cutting component 4 is restored to the initial conical cutter state by fixing the pushing and pulling tube 21 and extending the movable rod 22 to the far end, so that the peripheral dimension of the cutting component 4 is smaller than the inner diameter of the catheter 2, the cutting component 4 and the pushing component 3 can be retracted into the catheter 2 in the synchronous retraction of the pushing and pulling tube 21 and the movable rod 22, and the cutting component 4 and the pushing component 3 can be moved out of the body through the catheter 2.

The movable rod 22 in this embodiment includes a nickel-titanium alloy rod with a solid structure, preferably a cylindrical rod, which can ensure the structural strength of the movable rod 22 and enhance the reliability of the deformation of the blade 41 during the pushing and pulling process of the movable rod 22.

The blade 41 in this embodiment includes a plurality of prismatic blades 41, specifically, the blade 41 is a triangular prism blade 41, and the plurality of triangular prism blades 41 are uniformly distributed in the circumferential direction of the distal end limiting disc 32, and are fixed between the distal end limiting disc and the movable rod in a glue bonding or embedding manner. One end of each triangular prism blade 41 is connected to the outer edge of the far-end limiting disc 32 close to the far end, and the other end of each triangular prism blade 41 is intensively intersected at the far end of the movable rod 22, so that the deformation of the blades 41 can be facilitated.

The movable rod 22 is movably inserted into the push-pull tube 21 and can be extended and retracted back and forth relative to the distal end opening of the push-pull tube 21. With this arrangement, the cutter unit 4 and the pusher unit 3 can be effectively pushed, and the blade 41 can be reliably switched between the conveyance state and the cutting state.

Be provided with limit stop 5 on the outer wall of movable rod 22, limit stop 5 is including two fins that are located the movable rod 22 near-end, and two fins can mutually support with the near-end mouth of pipe of push-and-pull pipe 21, and the joint is at the near-end mouth of pipe of push-and-pull pipe 21. Through this kind of mode of setting, can be about to two fin joints when the near-end mouth of pipe of push-and-pull pipe 21 after pull-back movable rod 22, keep the cutting state of petal form cutting knife. After cutting, when the initial state of the cutting assembly 4 needs to be recovered, the clamping relation between the fins and the near-end pipe orifice of the push-pull pipe 21 is released.

The material of blade 41 is the nickel titanium alloy material, has good memory elasticity, is in the transition process by cutting state to the toper cutter state at cutting assembly 4, when removing the fin at the orificial joint relation of push-and-pull tube near-end, and the cutting blade 41 of distal end can stretch out to the distal end by oneself based on memory elasticity, and the distal end that drives movable rod 22 stretches out forward, resumes to the toper cutter state originally, has effectively guaranteed the reliability that different states switched.

Since the nitinol spring support 1 can be displayed in the in vitro development device, in order to obtain the positional relationship between the movable rod 22 and the spring support 1 by the development device, the movable rod 22 is provided with the development ring 23, preferably, the development ring 23 is provided at a position on the movable rod 22 that is extended and contracted relative to the push-pull tube 21, preferably, made of a platinum-iridium alloy material, and the state of the blade 41 can be effectively obtained by tracking the position of the movable rod 22.

Referring to fig. 7, in the present embodiment, the push-pull tube 21 includes a main body cavity 24 for the movable rod 22 to movably penetrate therethrough and a guide wire cavity 25 for the guide wire 7 to penetrate therethrough, the main body cavity 24 penetrates through the entire push-pull tube 21, that is, penetrates through the entire length direction of the push-pull tube 21, and both ends of the main body cavity 24 are both open structures, so as to ensure the entire penetration of the movable rod 22 in the push-pull tube 21.

The guide wire cavity 25 is mainly used for guiding the guide wire 7, so that the tail end of the guide wire 7 penetrates through the distal end opening of the guide wire cavity 25 and penetrates out of the proximal end opening of the guide wire cavity 25, mutual influence of the pushing assembly and the guide wire 7 on functions can be avoided by arranging the independent guide wire cavity 25 and the main body cavity 24, and the stent catheter system is accurately conveyed to a diseased part of the blood vessel 6 under the guiding action of the guide wire 7.

Specifically, the distal opening of the guide wire cavity 25 is disposed at the distal end of the push-pull tube 21, so that the movable rod 22 and the guide wire 7 can respectively extend out of the distal opening of the push-pull tube 21, and mutual interference between the two can be further reduced.

By the aid of the stent catheter system, a diseased part of a blood vessel 6 can be effectively cut, meanwhile, the cutting of the diseased part is organically connected with the implantation of the spring stent 1 in the diseased cut part, the implantation state of the spring stent 1 is greatly improved, the outer wall of the spring stent 1 can be effectively attached to the inner wall of the blood vessel 6, the spring stent 1 can freely deform along with the relaxation and contraction of the blood vessel 6 by combining with the memory elastic deformation of the spring stent 1, and the risks of formation of new thrombus and neointimal hyperplasia are greatly avoided on the premise that the stability of stent implantation is guaranteed.

The invention also provides a stent implantation method of the spring stent 1 according to the stent catheter system, which comprises the following steps:

the proximal end of a guide wire 7 is inserted into a movable rod 22, and the catheter 2, the stent delivery device and the spring stent 1 compressed in the catheter 2 are conveyed to a lesion part along the guide wire 7 under the guiding action of the guide wire 7;

before the distal orifice of the catheter 2 reaches the lesion site, stopping the insertion of the catheter 2, deforming the cutting assembly 4 at the distal end of the pushing assembly 3 by the mutual cooperation between the movable rod 22 and the push-pull tube 21, and pushing the movable rod 22 and the push-pull tube 21 to cut the lesion site in the blood vessel 6 after the cutting assembly 4 is deformed;

cutting a lesion part, pushing the compressed spring support 1 out of the catheter 2 to radially expand the compressed spring support, and attaching the radially expanded spring support 1 to the inner wall of the blood vessel 6 after the lesion part is cut;

the matching relation of the expanded spring support 1 and the fit of the inner wall of the blood vessel 6 is kept, and the spring support 1 is made to contract and expand along with the contraction and expansion of the blood vessel 6 in a self-contraction way along with the memory elasticity of the blood vessel 6;

and recovering the initial state of the cutting assembly 4, and withdrawing the catheter 2 and the stent delivery device to complete the implantation of the stent.

According to the implantation method of the spring support 1, the cutting of the lesion part of the blood vessel 6 and the implantation of the spring support 1 are organically combined, so that the cutting and the implantation of the lesion part of the blood vessel 6 are in joint fit, the wall attaching effect and the implantation stability of the spring support 1 and the blood vessel 6 can be ensured to the greatest extent, and meanwhile, the subjective factor that a doctor selects the specification of the support through experience judgment is avoided.

It should be pointed out that the diameter range of the spring support in the invention under the stretching state is actually selected according to the inner diameter of the blood vessel of the lesion part, the wall thickness of the spring support is 0.05-1mm, the alloy sheet finished by hollowing out is put into a shaping mould in the manufacturing process, and the shaping is finished by heat shaping under the heating condition of 100-800 ℃ in a drying oven.

It should be noted that the features of the embodiments in the present application may be combined with each other without conflict.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. The utility model provides a spring support, its characterized in that, includes clockwork spring, clockwork spring includes cylindric structure, cylindric structure includes the hollow section of thick bamboo that memory alloy silk screen circling coiled, the memory alloy silk screen is in the both ends of hollow section of thick bamboo keep the parallel and level, clockwork spring's lateral wall is hollow out construction.

2. The spring support according to claim 1, wherein said memory alloy comprises nitinol, and said power spring is made of a rectangular nitinol wire mesh and is scalable in a radial direction of said hollow cylinder.

3. The spring support according to claim 2, wherein the power spring includes a contracted state and an expanded state, the hollow cylinder having a diameter of 0.4-5mm in the contracted state and 0.8-10mm in the expanded state.

4. A stent catheter system, comprising the spring stent of any one of claims 1 to 3 and a stent delivery device, wherein the stent delivery device comprises a catheter and a pushing assembly which can be retracted and extended back and forth relative to the catheter, the pushing assembly is used for pushing the spring stent out of the catheter and implanting the spring stent into a blood vessel, and the distal end of the pushing assembly is connected with a cutting assembly which is used for cutting a lesion site in the blood vessel before the spring stent is implanted.

5. The stent catheter system according to claim 4, wherein a push-pull tube is disposed inside the catheter, the push assembly comprises two limiting discs connected to the push-pull tube, and the spring stent in a compressed state is disposed in the catheter between the limiting discs.

6. The stent catheter system according to claim 5, wherein a movable rod penetrates through the push-pull tube, the limiting disc comprises a proximal limiting disc and a distal limiting disc, the cutting assembly comprises a blade connected between the movable rod and the distal limiting disc, and the blade is made of nickel-titanium alloy.

7. The stent catheter system according to claim 6, wherein the blade comprises a plurality of prismatic blades spaced apart from each other in the circumferential direction of the distal end limiting disk, and each of the prismatic blades has one end connected to an outer edge of the distal end limiting disk and the other end concentrated across the distal end of the movable rod.

8. The stent catheter system according to claim 6, wherein the movable rod is movably inserted into the push-pull tube and can be extended and retracted back and forth relative to the distal opening of the push-pull tube, a sealing ring is arranged between the movable rod and the push-pull tube, and the movable rod comprises a solid nickel-titanium alloy rod.

9. The stent catheter system according to claim 8, wherein a limit stop is arranged on the outer wall of the movable rod, the limit stop can be matched and clamped with the proximal end pipe orifice of the push-pull pipe, and a developing ring is arranged on the part, corresponding to the telescopic part of the push-pull pipe, of the movable rod;

the push-pull tube comprises a main body cavity for the movable rod to movably penetrate and a wire guide cavity for the guide wire to penetrate and connect, the main body cavity penetrates through the push-pull tube, and a far-end opening of the wire guide cavity is formed in the far end of the push-pull tube.

10. A method of stenting according to the stent catheter system of claim 4, comprising the steps of:

delivering the catheter, the stent delivery device and the spring stent compressed in the catheter to a lesion part along the guide wire;

cutting the lesion part through a cutting assembly at the distal end of the pushing assembly;

pushing the compressed spring stent out of the catheter to enable the spring stent to expand radially;

the spring support expands to be attached to the inner wall of the blood vessel and shrinks and contracts with the contraction and expansion of the blood vessel;

and withdrawing the catheter and the stent conveying device to complete the implantation of the stent.

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