CN111658224B

CN111658224B - Recoverable vena cava filter

Info

Publication number: CN111658224B
Application number: CN202010651888.0A
Authority: CN
Inventors: 张文凯; 钟伟
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-07-08
Filing date: 2020-07-08
Publication date: 2021-08-20
Anticipated expiration: 2040-07-08
Also published as: CN113331988B; CN111658224A; CN113331988A

Abstract

The invention provides a recyclable vena cava filter, comprising: the recovery part with from at least 3 the structure poles that the recovery part sent, 3 at least structure poles form two at least thrombus filter screens, two supporting disks and a terminal configuration through crooked design, wherein, a thrombus filter screen set up in between recovery part and a supporting disk, another thrombus filter screen sets up the waist between two supporting disks, terminal configuration sets up in another supporting disk and keeps away from the one end of thrombus filter screen, terminal configuration includes a plurality of free ends each other, a plurality of free ends each other to the crooked gathering of axis slope of vena cava filter. The invention can effectively prevent the problems of deflection, deviation, displacement and the like of the vena cava filter, effectively improve the thrombus filtering effect and prolong the safe recovery time.

Description

Recoverable vena cava filter

Technical Field

The invention relates to a vena cava filter, in particular to a recyclable vena cava filter.

Background

Pulmonary artery embolism (PE) has a high incidence and mortality rate, may cause chronic pulmonary hypertension, and seriously affects the quality of life of patients. Deep Venous Thrombosis (DVT) of the lower limb is the leading cause of pulmonary artery embolism, and PE will occur in 60-70% of DVTs; meanwhile, 90% -95% of pulmonary artery emboli are derived from DVT. Because of the high morbidity, mortality, and disability rates associated with PE that are highly correlated with DVT, current anticoagulant therapy is considered to be an effective method for treating DVT and preventing PE; however, for those who have anticoagulation contraindications, severe complications during anticoagulation therapy, and anticoagulation failures, the Vena Cava Filter (VCF) is an effective method for preventing PE. The application of the vena cava filter can not only effectively prevent pulmonary embolism, but also ensure that the thrombolysis and the surgical treatment are safer and more effective through the vena cava filter.

The VCF is placed in the inferior vena cava of a human body in a net-like basket structure to capture thrombus floating in blood, and is usually prepared by using metal wire weaving or metal pipe laser engraving cutting, and then carrying out a series of post-treatments such as shaping, polishing and the like. The VCF on the market is mainly a permanent and temporary implantation device, wherein once the permanent VCF is used, the patient must take anticoagulant for life, and the VCF is implanted in the body for a long time, and the VCF has the problems of deformation, inclination, displacement, fracture and the like, and the blood vessel has the risk of obstruction and even puncture. Therefore, it is clinically recommended to use a temporary filter, which is inserted during the acute phase of deep venous thrombosis and removed when the risk of thrombus detachment is reduced after the acute phase. Therefore, it is clinically recommended to use a temporary filter, which is inserted during the acute phase of deep venous thrombosis and removed when the risk of thrombus detachment is reduced after the acute phase.

The temporary VCF is mainly divided into an open type filter and a closed frame type filter, wherein the single umbrella open type filter comprises a plurality of structural rods, one ends of the structural rods are open ends, the other ends of the structural rods are gathered together to form a closed end to form a filter screen, the structural rods are radiated from the closed end and are contacted with a blood vessel to play a role in fixing the filter, as the tail ends of the structural rods are free, even if the structural rods are wrapped by a neointima of the blood vessel, the structural rods can be easily separated from the blood vessel wall by external force at any time according to needs, and the intima of the blood vessel is not damaged, so the recovery period of the open type filter is longer, but as one end of the single umbrella open type filter is an open structure, the support strength of the structural rods at the open end to the blood vessel is weaker, the filter is easy to incline and shift under the influence of blood flow, respiration and external force, the, secondly, the single-layer filter screen has low filtering efficiency. And closed frame-type filter includes many structure poles, the both ends of many structure poles converge respectively and form the blind end together, structure pole and vascular contact, play the effect of fixed filter, two confined terminal surfaces are the filter screen, closed frame-type filter's stability is better, be difficult to slope and aversion, the filter effect is good, but because the both ends of this filter are sealed, if filter structure pole is by neogenesis inner membrane parcel, the structure pole can't be extracted from the vascular wall, only can will cover the neogenesis inner membrane of structure pole by force and tear, just can take out the filter, if neogenesis inner membrane hyperplasia is thick can't tear, can lead to the filter of implanting to be difficult to take out, the recovery time window period is shorter.

Disclosure of Invention

The invention aims to solve the technical problem of providing a recyclable vena cava filter which can combine the advantages of an open-type filter and a closed-type filter and effectively prolong the safe recovery time window of the vena cava filter.

To this end, the present invention provides a recyclable vena cava filter comprising: the recovery part with from at least 3 the structure poles that the recovery part sent, 3 at least structure poles form two at least thrombus filter screens, two supporting disks and a terminal configuration through crooked design, wherein, a thrombus filter screen set up in between recovery part and a supporting disk, another thrombus filter screen sets up the waist between two supporting disks, terminal configuration sets up in another supporting disk and keeps away from the one end of thrombus filter screen, terminal configuration includes a plurality of free ends each other, a plurality of free ends each other to the crooked gathering of axis slope of vena cava filter.

In a further development of the invention, each construction rod branches off from the recovery section in a direction away from the recovery section into at least 2 branches, forming a single-stage or multi-stage branched construction rod, the construction rod emerging from the recovery section and the branched construction rod being crossed or woven with one another before the first formation of a support disk contacting the vessel wall, forming a thrombus filter mesh of a lattice structure, preferably comprising a diamond or a circle.

The end of the tail end configuration, which is far away from the second support disc, is provided with a transition arc-shaped tail end, and the transition arc-shaped tail end comprises a spherical tail end or a water-drop tail end; or one end of the tail end configuration, which is far away from the second supporting disc, is set to be a transition softening tail end, the transition softening tail end comprises a transition section and a round tail end which are sequentially connected, and the transition section is a tapered transition section or a softening transition section for winding a spring.

The invention is further improved in that the recovery part is a self-centering recovery part which comprises a centering umbrella, a connecting column and an internal thread, the centering umbrella is connected to the first thrombus filter screen through the connecting column, wherein the centering umbrella is a conical component with an opening at the bottom, the conical opening direction of the conical component is far away from the first thrombus filter screen, and the conical surface of the conical component is preferably provided with open grooves distributed at intervals along the axis; the connecting column is a cylinder, and the internal thread is arranged in the connecting column.

The vena cava filter is further improved in that a recovery part, a first thrombus filter screen, a first support disc, a second thrombus filter screen, a second support disc and a tail end configuration are sequentially arranged along the central axis of the vena cava filter, wherein one end of the recovery part is connected with the first thrombus filter screen, and the other end of the recovery part is a connecting part; one end of the first support disc is connected to the first thrombus filter screen, and the other end of the first support disc is closed and connected to the second thrombus filter screen; one end of the second support plate is closed and connected to the second thrombus filter screen, and the other end of the second support plate is open and connected to the tail end configuration; the first thrombus filter screen distributes between recovery portion and the first supporting disk, the second thrombus filter screen distributes the waist of the binding off between first supporting disk and the second supporting disk.

The first thrombus filter screen is formed by bending a plurality of construction rods between the recovery part and the first support disc to form a conical surface filter screen, wherein one end of the plurality of construction rods is connected to the recovery part, the other end of the plurality of construction rods is connected to the first support disc in a divergent bending mode and extends smoothly, and the construction rods are mutually spaced to form a bent rib-shaped filter grid.

In a further improvement of the present invention, the first support plate is a cylindrical cage-like body, and the first support plate and/or the second support plate is/are provided with a spike-shaped anchor that is spaced apart from a central axis of the vena cava filter and radiates outward, and the outward radiation direction of the spike-shaped anchor is a direction spaced apart from the recovery portion.

In a further development of the invention, the second thrombus filter is bent by a plurality of construction rods around the central axis of the vena cava filter and offset from the axis of the preset distance to form spatially staggered filter cells between the first support disk and the second support disk.

The invention is further improved in that the second thrombus filter forms a thrombus filter structure with tensile deformation and convergence bundling performance by the spatial staggering of a plurality of construction rods.

The invention further improves that one end of the end configuration is continuously connected with the second supporting disk, and the other end of the end configuration is bent towards the axis, double-bent or free in inward rolling.

Compared with the prior art, the invention has the beneficial effects that: the vena cava filter is implanted into a lower vena cava channel, so that an apparatus can be effectively prevented from inclining, a conveying catheter reaches a target position, the two supporting disks compress a blood vessel from inside to outside according to the expansion of the shape of the conveying catheter after the conveying catheter is released, the blood vessel forms two convex parts, the blood vessel forms reverse pressure on the vena cava filter, and the vena cava filter can obtain effective fixing force.

On the basis, the vena cava filter has self-adaptive capacity aiming at the pressure environment of a target blood vessel through the optimized structural design, the size and the shape of the support disc can be adjusted by the support disc according to the pressure of the blood vessel wall and the blood pressure of the blood vessel change, the support adaptive capacity of the vena cava filter is improved, excessive stimulation or damage to the blood vessel due to excessive support force is prevented, and the safety performance of a product is greatly improved; in addition, the endothelialization speed of the blood vessel to the vena cava filter can be effectively delayed, the safe implantation time of the vena cava filter is effectively prolonged, and the safe recovery time window of the vena cava filter is prolonged.

Drawings

FIG. 1 is a schematic structural view of a construction rod encapsulated by proliferative tissue;

FIG. 2 is a schematic view of the construction of a structural rod removed from the intima of the vessel hyperplasia;

FIG. 3 is a schematic perspective view of a single construction rod in accordance with one embodiment of the present invention;

FIG. 4 is a schematic illustration of an implanted three-dimensional configuration of a construction rod forming a multi-level bifurcated construction rod in accordance with an embodiment of the present invention;

FIG. 5 is a schematic view of an implanted cross-sectional configuration of a structural rod forming a multi-level bifurcated structural rod in accordance with an embodiment of the present invention;

FIG. 6 is a schematic view of an implant site configuration in a blood vessel according to an embodiment of the present invention;

FIG. 7 is a schematic structural view of a transition radiused design of the tip configuration of one embodiment of the present invention;

FIG. 8 is a schematic structural view of a softening structure treatment of the end configuration according to one embodiment of the present invention;

FIG. 9 is a schematic perspective view of a self-centering recycling unit according to an embodiment of the present invention;

FIG. 10 is a schematic cross-sectional view of a self-centering recovery unit according to an embodiment of the present invention;

FIG. 11 is a schematic perspective view of example 1 of the present invention;

FIG. 12 is a schematic front view showing the structure of embodiment 1 of the present invention;

FIG. 13 is a side view schematically showing a part of the structure of example 1 of the present invention;

FIG. 14 is a schematic view of a different configuration of the tip of one embodiment of the present invention;

FIG. 15 is a schematic perspective view of example 2 of the present invention;

FIG. 16 is a schematic front view showing the structure of embodiment 2 of the present invention;

FIG. 17 is a schematic perspective view of example 3 of the present invention;

FIG. 18 is a schematic front view showing the structure of embodiment 3 of the present invention;

FIG. 19 is a schematic perspective view of example 4 of the present invention;

FIG. 20 is a schematic front view showing the structure of embodiment 4 of the present invention;

FIG. 21 is a schematic perspective view of example 5 of the present invention;

FIG. 22 is a schematic front view showing the structure of embodiment 5 of the present invention;

FIG. 23 is a schematic side view of embodiment 5 of the present invention.

Detailed Description

Preferred embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

Aiming at the defects of the prior art, how to simultaneously take the advantages of the open-type and closed-frame type filters into consideration, the safe recovery time window of the filter is prolonged to the greatest extent, and the stability of the filter in vivo is ensured to be a difficult problem to be solved urgently, therefore, the embodiment aims to provide a novel recyclable vena cava filter, under the condition of ensuring the high-efficiency interception performance of the vena cava filter to thrombus, the vena cava filter has long-time recyclable operation window time, is not easy to shift in an implant, can be repeatedly recovered and released, is accurately positioned, and is convenient to place and recover. The vena cava filter can be made of metal or high polymer materials, and is preferably formed by cutting and shaping an integral nickel-titanium alloy tube, or is preferably formed by connecting memory alloy wires, belts and the like.

Example 1:

as shown in fig. 1 to 13, the present example provides a recyclable vena cava filter comprising: recovery unit 11 with from 3 at least constitution poles 1 that recovery unit 11 sent, 3 at least constitution poles 1 through crooked design form two at least thrombus filter screens, two supporting disks and a terminal configuration 16, wherein, a thrombus filter screen set up in between recovery unit 11 and a supporting disk, another thrombus filter screen sets up the waist between two supporting disks, terminal configuration 16 sets up and keeps away from in another supporting disk the one end of thrombus filter screen, terminal configuration 16 includes a plurality of free ends each other, a plurality of free ends each other to the crooked gathering of axis slope of vena cava filter. The radial width of the support disc is preferably greater than the radial width of the thrombus filter screen so that the thrombus filter screen does not contact the vessel wall 3. The recoverable vena cava filter is called a vena cava filter or a filter for short. The central axis of the vena cava filter in this example may also be referred to as the axial axis for short.

The radial width of the support plate in this example is greater than the radial width of the thrombus filter, that is, the radial width of the first support plate 13 and the second support plate 15 is greater than the radial width of the first thrombus filter 12 and the second thrombus filter 14, so that the first thrombus filter 12 and the second thrombus filter 14 can not directly contact with the blood vessel wall 3 (keep away from the blood vessel wall 3), and the safe recovery time window of the vena cava filter can be effectively prolonged.

More specifically, as shown in fig. 11 to 13, in this embodiment, a recovery part 11, a first thrombus filter 12, a first support disc 13, a second thrombus filter 14, a second support disc 15 and a tip configuration 16 are sequentially arranged along a central axis of the vena cava filter, wherein one end of the recovery part 11 is connected with the first thrombus filter 12, and the other end of the recovery part 11 is a connecting part; one end of the first support disc 13 is connected to the first thrombus filter 12, and the other end of the first support disc 13 is closed and connected to the second thrombus filter 14; one end of the second support plate 15 is closed and connected to the second thrombus filter 14, and the other end of the second support plate 15 is open and connected to the end configuration 16; the first thrombus filter 12 is disposed between the recovery part 11 and the first support plate 13, and the second thrombus filter 14 is disposed at a waist part of a closed end between the first support plate 13 and the second support plate 15.

Further, the present embodiment may preferably further include a third thrombus filter, which may be provided similarly to the second thrombus filter 14, for enhancing the filtering effect thereof, and may be set as the case may be; the other end of the recovery part 11 is a connection part, which is preferably an easy connection part having various shapes such as a hook shape or a screw thread, and is convenient for recovery.

As shown in fig. 13, in the first thrombus filter 12 of this embodiment, a plurality of structural rods 1 are bent between the recovery part 11 and the first support plate 13 to form a conical filter, wherein one end of the plurality of structural rods 1 is connected to the recovery part 11, the other end of the plurality of structural rods 1 is connected to the first support plate 13 in a diverging and bending manner and extends smoothly, and the structural rods 1 are spaced from each other to form a curved rib-shaped filter mesh, so as to improve the thrombus filtering effect.

That is to say, this example is preferred to be assembled by the restraint of one end, and the semi-open overall structure of other end constitutes cage form double plate structure, to give the restraint to the whole radial direction of vena cava filter, the vena cava filter has the neutrality, works as when the vena cava filter is implanted the inferior vena cava warp, can effectively avoid the apparatus slope, leads to the recovery part to press close to the vascular wall, and unable recovery phenomenon strengthens its recovery performance.

The vena cava filter can be implanted from a jugular vein or a femoral vein, the vena cava filter is retracted into a conveying sheath when being implanted, the vena cava filter is delivered to a target position, an appliance after a withdrawal tube is released is made of a memory material, the shape of the appliance is restored to be expanded after the release, the first supporting disc 13 and the second supporting disc 15 press a blood vessel from inside to outside, the blood vessel forms two convex parts, the blood vessel forms reverse clamping force on the vena cava filter, the vena cava filter obtains effective fixing force, the vena cava filter has reliable positioning capacity, the displacement of the implanted filter along the axis of the blood vessel is avoided, if stronger positioning is obtained, a sharp convex fixing anchor structure is arranged on the supporting discs in an auxiliary mode. The double-disc support structure is adopted in the embodiment, the skewing, the deviation and the displacement of the filter are effectively prevented, and the axial line of the vena cava filter is consistent with the axial line of a target blood vessel and is accurately positioned.

The structure rod 1 is in a positive or negative S-shaped structure, the clamping force of blood vessels on the front and back first supporting disks 13 and the second supporting disk 15 is transmitted through the S-shaped structure of the structure rod 1 to form mutual support, so that the structure rod can be self-adaptive to the pressure environment of a target blood vessel, the size and the shape of the supporting disks can be self-adjusted to form proper filter supporting force, and the excessive supporting force can be prevented from forming larger pressure on the blood vessels to excessively stimulate the blood vessels. On the basis, even if the first support disc 13 and the second support disc 15 are wrapped by the neointima, the construction rod 1 forming the support discs does not have a reverse bifurcation structure, namely, a bifurcation structure with branches towards the main branch direction does not exist, a certain recovery force is loaded on the proximal recovery part 11, and the vena cava filter which is endothelialized can be completely extracted from the intima of the blood vessel along with the deformation of the construction rod 1, so that the tearing of the blood vessel wall 3 is avoided, and the recovery time of the vena cava filter can be effectively prolonged.

As shown in figure 1, after the filter is implanted into a human body, a certain degree of endothelialization phenomenon inevitably exists by a component contacted with a blood vessel wall 3, if a filter construction rod 1 is wrapped by a neointima, the construction rod 1 and the blood vessel wall 3 are integrated, the construction rod 1 cannot be pulled out of the blood vessel wall, the filter can only be taken out by forcibly tearing the neointima 2 of the blood vessel covering the construction rod, if the neointima 2 is thick and cannot be torn, the filter cannot be taken out, aiming at the problem, the embodiment adopts an innovative structural design, as shown in figure 2, the structure of the filter is optimized, one end of the construction rod 1 is kept free, when the filter is recovered, the construction rod 1 is pulled out of the neointima 2 of the blood wall, the construction rod 1 is taken out of the neointima 2 without tearing, the difficulty of taking out the construction rod 1 from the neointima 2 is reduced, the recovery time of the filter is prolonged, the structural rod 1 is wrapped around the normal blood vessel at the contact site with the vessel wall 3 by the hyperplastic tissue of the neointima 2.

The structural rod 1 is wrapped by the proliferation tissue of the neointima 2 at the position directly contacting with the blood vessel wall 3, the structural rod 1 does not have a reverse direction bifurcation structure, is deformed and straightened by the force in the recovery direction, is extracted from the proliferation tissue to be separated from the proliferation tissue, and the blood vessel wall 3 only leaves an occupying cavity 4 of the structural rod 1, so that the neointima of the blood vessel is prevented from being torn and a filter is easy to take out, as shown in fig. 2.

The vena cava filter in this example comprises at least 3 structural rods 1 which are emitted from a recovery part 11 and are far away from a central axis, wherein each 1 structural rod 1 is formed by forward and reverse S-shaped bending shaping as shown in FIG. 3 or forward and reverse 3-shaped bending shaping, different area sections are formed at different positions to form different functional sections, such as the aforementioned support plate, thrombus filter and end configuration 16, that is, the recovery part 11 in this example is a connecting part for realizing recovery, the structural rods 1 are basic units of the vena cava filter as shown in FIGS. 1 to 3, the structural rods 1 comprise a first thrombus filter 12, a first support plate 13, a second thrombus filter 14, a second support plate 15 and an end configuration 16, different component names are that the structural rods 1 are positioned at different parts to realize a section division of different functions, arranged in sequence, without obvious distinguishing marks on the structure, the vena cava filter comprises a plurality of construction rods 1 which are integrally and continuously extended and formed into deformed configurations, and the shapes and the lengths of a plurality of the end configurations 16 can be set or adjusted according to different customs of actual conditions, namely the shapes and the lengths can be different, namely the end configurations 16 are the ends of the construction rods 1 with different shapes and lengths.

In this example, the first support plate 13 and the second support plate 15 are in contact with the blood vessel wall 3, the first thrombus filter 12 and the second thrombus filter 14 are not in direct contact with the blood vessel wall 3, one ends of the structural rods 1 are gathered and collected in the collection portion 11, and the other ends are in a free state in a released state.

As shown in fig. 3, the single construction rod 1 projects to a filter axis plane or a parallel axis plane, is bent crosswise left and right along a central axis 211 of the vena cava filter, is bent up and down in a staggered manner on a plane 212 perpendicular to the central axis of the vena cava filter, and the projection of the single construction rod 1 on the central axis plane or the parallel axis plane of the vena cava filter is in an "S" shape or an inverse "S" shape.

As shown in fig. 4 and 5, in this example, each structural rod 1 is branched into at least 2 branches in a direction away from the recovery part 11 to form a single-stage or multi-stage branched structural rod 1, and the structural rod 1 and the branched structural rod 1 are crossed or woven with each other to form a thrombus filter having a lattice structure including a diamond shape or a circular shape before a support plate contacting a blood vessel wall is formed for the first time.

Such as: the construction rod 1 includes a main branch of the recovery part 11 and secondary branch construction rods, wherein the secondary branch construction rods include a primary branch construction rod 101 and a secondary branch construction rod 1001, and the secondary branch construction rod 1001 is a branch of the primary branch construction rod 101, thereby forming an integral multi-bifurcated construction rod 1. Each construction rod 1 can be branched into 2 or more than 2 secondary branch construction rods from the recovery part to any position of the far end to form a single or multiple stages of small primary branch construction rods 101 and secondary branch construction rods 1001; construct pole 1 and be in being constructed the parcel by the proliferation tissue with 3 direct contact positions of vascular wall, from branch to trunk direction definition for the positive direction, opposite definition is the reverse direction, and the filter bears the recovery pulling force in positive direction, construct pole 1 does not have reverse direction bifurcation structure, receiving the pulling force of recovery portion, warp the flare-out, 2 piece at least second grade branch structure poles 1001 to the displacement of converging of one-level bifurcation structure pole 101 positive direction, 2 piece at least secondary branch structure poles to the displacement of converging of main branch positive direction of recovery portion 11, and then the filter is taken out the separation in from the proliferation tissue, only leaves in the vascular wall 3 construct 1 occupy-place cavity of pole, avoid tearing to venous vessel. In this example, the plurality of first-stage branch structure rods 101 and the second-stage branch structure rods 1001 intersect with each other to realize that the filter structure can be directly used as the first thrombus filter 12.

As shown in fig. 6, the vena cava filter is provided in this example as a placement in the inferior vena cava 7 between the renal vein 9 and the iliac vein 8 in a direction along or against the blood flow, and can be positioned, released, and retrieved from the body at the appropriate time by an interventional procedure via the jugular vein or the femoral vein with a delivery/retrieval sheath. During implantation, neointimal 2 hyperplasia tissue is created at the filter and vessel wall contact site, surrounding the support disc of the vena cava filter.

As shown in fig. 7, in this example, the end of the end configuration 16 away from the second support plate 15 is provided with a transitional rounded end 60, which includes a spherical end or a drop-shaped end; alternatively, as shown in fig. 8, an end of the end configuration 16 far from the second support disk 15 is provided with a transition softening end 70 or a transition softening end 70 ', the transition softening end 70 or the transition softening end 70' comprises a transition section and a round end which are sequentially connected, and the transition section is a softening transition section which is tapered or comprises a wound spring.

In order to further avoid the blood vessel puncture during the releasing, recovering and implanting processes, avoid the puncture of the free end configuration to the blood vessel wall and reduce the filter recovering resistance, as shown in fig. 7, the present embodiment performs a smoothing treatment to the end configuration 16, for example, a transition rounded end 60 is formed by performing a secondary processing to perform a tail rounding, and the tail end shape thereof may be a transition rounding such as a round ball and a drop shape, and further, a ball may be connected, and the ball may be a metal such as gold, tungsten, platinum, an alloy containing the foregoing metal, a polymer, and the like.

Still further, as shown in fig. 8, the end configuration 16 is softened by the present embodiment, for example, the end portion of the transition-softened end 70 is made of a tapered transition section 76, a metal spring wound into a softened transition section 77 and a rounded cap 78 at the front end, so as to avoid puncturing the blood vessel. The tip configuration 16 may also be tapered, such as by tapering the transition softened end 70 'to a tapered transition 76' and by providing a small rounded tip 79, the vessel puncture may be effectively avoided by the tapered and/or soft design of the diameter of the tip.

As shown in fig. 9 and 10, the recovery unit 11 of this embodiment is a self-centering recovery unit 11 including a middle umbrella 911, a connecting column 912, and an internal thread 913, wherein the middle umbrella 911 is connected to the first thrombus filter 12 through the connecting column 912, the middle umbrella 911 is a conical member with an open bottom, the conical opening of the conical member is directed away from the first thrombus filter 12, and the conical surface of the conical member is provided with open grooves distributed at intervals along the axis; the connection column 912 is a cylinder, the internal thread 913 is a thread structure disposed inside the connection column 912, and only the position thereof is marked in fig. 9 and 10, and the thread is not drawn.

That is, in addition to the basic design of the recovery part 11 shown in fig. 11 and 12, the present embodiment can also preferably adopt the preferable design shown in fig. 9 and 10 to further realize a self-centering filter recovery part structure, wherein the recovery part 11 is located at one end of the filter, is connected with the first thrombus filtering screen 12, and consists of a centering umbrella 911, a connecting column 912 and an internal thread 913, the centering umbrella 911 is in a conical shape with an open bottom, the conical opening direction is far away from the filter, the conical surface is provided with open grooves distributed at intervals along the axis, so that the flow of blood flow is prevented from being excessively interfered, and meanwhile, the entry of the spring flexible shaft with a bolt head is facilitated. The connecting column 912 is a cylinder and is connected with the first thrombus filtering part 12 of the filter, and the internal thread 913 is located in the connecting column 912 and used for detaching and connecting the filter. Therefore, the present embodiment provides two recovery modes, the spring flexible shaft with the bolt head at the front end is adopted to enter a larger area of the conical centering umbrella 911, and the spring flexible shaft can be smoothly connected with the centering umbrella through the internal thread 912, so that the filter screen can be conveniently recovered; or, the metal snare is adopted, so that the middle umbrella 911 can be easily positioned on the outer conical surface, tightened and fixed, and the filter can be conveniently recovered.

It is worth mentioning that, in this example, the first supporting disk 13 is a similar cylindrical cage body, and includes the many that are extended by the one end of first thrombus filter 12 construct the pole 1, the waist that the crooked binding off was closed up between first supporting disk 13 and second supporting disk 15 is extended to the second thrombus filter 14 other end, set up on first supporting disk 13 and/or the second supporting disk 15 and keep away from vena cava filter center pin and external radiation's spine form anchor, the external radiation direction of spine form anchor is for keeping away from the direction of recovery unit 11 to further avoid vena cava filter's aversion, and strengthen vena cava filter's location ability.

It is also worth mentioning that in the second thrombus filter 14 of the present embodiment, the plurality of construction rods 1 are wound around the central axis of the vena cava filter and are deviated from the axis of a preset distance, and the first thrombus filter 12 and the second thrombus filter 14 are bent to form a spatially staggered filter grid, that is, in the present embodiment, the second thrombus filter 14 is bent by each construction rod 1 around the central axis of the vena cava filter and is deviated from the axis of the preset distance, the preset distance can be customized and adjusted according to actual design or use requirements, so that the second thrombus filter 14 is bent between the first support disc 13 and the second support disc 15 to form a spatially staggered filter grid, a projection is made on a plane perpendicular to the axis to form a filter grid shape, the filter grid axis of the second thrombus filter 14 is staggered with the filter grid axis of the first thrombus filter 12, thereby further improving the thrombus filtering effect.

In addition, in this embodiment, the second support plate 15 is formed by bending the plurality of construction rods 1 to form a half-open cage structure having a U-like shape, one end of the second support plate 15 is formed by extending and bending the second thrombus filter 14 at the waist portion between the first support plate 13 and the second support plate 15, and the other end is connected to the distal end structure 16 in series, and similarly, in this embodiment, it is preferable that a small spike-shaped anchor is provided on the first support plate 15 so as to radiate outward away from the central axis of the vena cava filter, and the direction of the spike-shaped anchor is a direction away from the collection unit 1, so that the displacement of the vena cava filter can be prevented, and the positioning ability of the vena cava filter can be enhanced.

The supporting force of the vena cava filter can be adjusted by adjusting the geometrical size of the construction rod 1, such as the width, the thickness, the fitting length with the blood vessel wall 3, the bending shape and the bending angle of the construction rod 1. Different supporting forces are obtained by respectively adjusting the diameter sizes of the first supporting disk 13 and the second supporting disk 15, and the first supporting disk 13 and the second supporting disk 15 can also adopt different diameters so as to adapt to the actual diameter shape of the blood vessel.

In this embodiment, one end of the end configuration 16 is continuously connected with the second support plate 15, and the other end is free and bent to form an arc bending towards the axis or inward rolling, as shown in fig. 14, the end configuration 16 is extended to form an auxiliary thrombus filter screen, so as to effectively intercept venous thrombus. For example, to enhance the thrombus filtering capability, in addition to increasing the number of the construction rods 1, the construction rods 1 may be formed by bending, winding "O", "8", interlacing with adjacent or non-adjacent construction rods at the first thrombus filter 12, so as to increase the mesh density of the thrombus filter and further improve the thrombus-capturing efficiency.

In the second thrombus filter 14 of the present embodiment, the plurality of construction rods 1 are spatially staggered to form a thrombus filter structure having tensile deformation and bundling properties. Namely, the plurality of construction rods 1 at the second thrombus filter screen 14 are staggered in space, so that a firm and stable cross structure cannot be formed, and the thrombus filter screen has tensile deformation and convergence bundling performance and is convenient to recover the sheathing canal performance. The tip configuration 16 itself has some thrombus trapping capability, e.g., prolonged pooling may be present as an additional third thrombus filter layer. Therefore, the vena cava filter has a thrombus filtering structure which can be adjusted in a large range, and is matched with the actual clinical requirements.

The end configurations 16 are free from each other and have a shape which is bent and gathered obliquely towards the axis, so that the situation that the end configurations 16 are bound by a release sheath-free pipe at the moment of leaving the port of the conveying sheath pipe in the filter release process, the memory size is restored instantly to have an outward bouncing effect, and the vascular wall is easy to stab is effectively avoided. Therefore, the end configuration 16 of the present embodiment adopts a shape of bending and gathering towards the axis, and releases an arc segment which is instantly contacted with the inward bending of the blood vessel, so as to avoid stabbing the blood vessel wall, as shown in fig. 14, one end of the end configuration 16 of the present embodiment is continuously connected with the second support plate 15, and the other end of the end configuration 16 is bent towards the axis, double bent or rolled inwards to free, and the bent end configuration 16 forms a different structural shape of bending towards the axis or rolling inwards, and is inclined, deformed and gathered towards the axis, so that on the basis of filtering thrombus, the drawbacks of stabbing the free end configuration on the blood vessel wall 3 and the like can be effectively avoided.

Example 2:

as shown in fig. 15 and 16, in addition to the embodiment 1, the present embodiment performs the structural optimization design on partial components, each structural rod 1 of the vena cava filter in the present embodiment can be branched into 2 or more than 2 thin branch structural rods from the recovery part 11 to any position at the far end to form a single or a plurality of small branch structural rods, before the first support disc 13 contacting with the blood vessel wall 3 is formed for the first time, the structural rod 1 sent out from the recovery part 11 and the branch small structural rods formed by branching are mutually crossed or woven to form a grid structure such as diamond or circle, so as to form a first thrombus filter screen 12 more beneficial to thrombus filtration, and the first thrombus filter screen 12 is far away from the blood vessel wall 3 and keeps a certain distance from the blood vessel wall 3, so as to avoid the thrombus intimal cells from attaching and proliferating to the first thrombus filter screen 12.

Except that the first thrombus filter screen 12 can form stable and firm intersection and be woven into the thrombus filter screen through the construction rod 1, the second thrombus filter screen 14, the first supporting disk 13, the second supporting disk 15 and the tail end configuration 16 keep free states mutually and are bent, inclined and gathered towards the axis. Under the action of the recovery force, the whole body is synchronously converged into a bundle and is extracted from the vessel wall,

similarly, the vena cava filter of the present example is formed by bending and shaping at least 3 of the structural rods 3 emanating from the recovery portion 11 away from the axis in a positive and negative "S" or positive and negative "3" shape, forming different sized and shaped sections at different locations, forming different functional sections, such as the aforementioned support plate, thrombus filter and tip configuration 16. In this embodiment, the first thrombus filter 12 may further include at least 2 first branches 122 and second branches 123 radiating from the main branch 121 of the recovery part 11, the first branches 122 and the second branches 123 are collected at the initial position of the first support tray 13, the first thrombus filter 12 is formed by the first branches 122 and the second branches 123 of the main branch 121, and the dense mesh increases the supporting force of the filter, thereby increasing the thrombus filtering effect of the vena cava filter. In this embodiment, the diameter of the first thrombus filter 12 is preferably not larger than the diameter of the first support disk 13, and is usually as small as 1 to 8mm, which is the most effective design.

Example 3:

as shown in fig. 17 and 18, in addition to embodiment 1, the present embodiment is structurally optimized for a part of the components, and unlike embodiment 1, the present embodiment is configured such that a structural rod 1, which is projected from a recovery part 11 away from a central axis thereof, is in a positive or negative "3" shape, and encloses two first thrombus filter 12, a first support plate 13, a second thrombus filter 14, a second support plate 15, and a tip configuration 16, respectively; the end configurations 16 of all the construction rods 1 are free from each other and converge towards the central axis of the vena cava filter.

In the embodiment, the first thrombus filter screen 12 is formed by bending a plurality of construction rods 1 in a recovery part 11 and a first support disc 13 to form a conical surface filter screen, wherein the conical surface filter screen comprises a plurality of construction rods, one end of each construction rod is collected and connected with the recovery part, the other end of each construction rod is radiated and dispersed to be smoothly and extendedly connected with the first support disc 13, each construction rod 1 is mutually spaced, and the projection of the first thrombus filter part 13 is an umbrella-shaped framework on a plane vertical to an axis to form a filter grid. The end configuration 16 is formed by bending the second support plate 15, one end of the end configuration is in a free shape, and a plurality of end configurations 16 can form an auxiliary third thrombus filter.

The construction rod 1 of the present example adopts a positive or negative 3-shaped structure, which can facilitate the extraction of the neointima 2 hyperplasia tissue from the intima after the neointima 2 hyperplasia tissue has climbed the vena cava filter, reduce the recovery resistance of the vena cava filter, and greatly increase the recovery time of the vena cava filter.

Example 4:

as shown in fig. 19 and 20, in the present example, in addition to example 1, the structural optimization design is performed on part of the components, in the present example, the structural rod 1 which is projected from the recovery part 11 away from the central axis thereof is in a positive or negative "S" shape, and is enclosed into two first thrombus filter 12, a first support disc 13, a second thrombus filter 14, a second support disc 15, and a distal end configuration 16, respectively, and the distal end configurations 16 of all the structural rods 1 are mutually released and gathered into the central axis of the vena cava filter. Different from embodiment 1, a preset deflection angle and a preset distance are designed between the central axis of the construction rod 1 and the central axis of the vena cava filter, the preset deflection angle can be self-defined and adjusted according to actual needs, the preset distance can also be self-defined and adjusted according to actual needs, the preset deflection angle between the central axis of the construction rod 1 and the central axis of the vena cava filter is preferably 5-45 degrees, the deflection direction is clockwise and anticlockwise, the design does not appear in the industry, and experiments prove that the self-adaptability of the vena cava filter to blood vessels can be effectively improved.

Example 5:

as shown in fig. 21 to 23, in example 1, in addition to the structural optimization of the present example in which some components are designed, the present example is designed to be curved from the collection portion 11 to enclose two first thrombus filter 12, first support disk 13, second thrombus filter 14, second support disk 15, and end configuration 16, respectively, and the end configurations 16 of all the structural rods 1 are free from each other and gathered in the central axis of the vena cava filter. Unlike embodiment 1, in this embodiment, each structural rod 1 is branched into at least 2 branches from the recovery part 11 to any position at the far end to form a branched structure, so as to form a small structural rod, the far end of the small structural rod is kept free, as shown in fig. 21 to 23, the main branch 121 is sent from the recovery end and is branched into at least two first branches 122 at a suitable place, even each first branch 122 can be further branched into at least two second branches; the multi-stage bifurcation structure can increase the thrombus capturing capacity of the filter and effectively improve the supporting force of the vena cava filter to blood vessels.

In summary, the present example is formed by bending and shaping at least 3 structural rods 1 to form at least two thrombus filter meshes, two support plates and a terminal configuration 16, thereby forming an integral cage-shaped double-disk structure with one end constrained and converged and the other end semi-opened, effectively avoiding the inclination of the device when the device is implanted into the inferior vena cava, the catheter is conveyed to a target position, the catheter expands according to the shape after being released to enable the two supporting discs to press the blood vessel from inside to outside, the blood vessel forms two convex parts, the blood vessel forms reverse pressure on the vena cava filter, and the vena cava filter obtains effective fixing force, the problems of skewing, deviation, displacement and the like of the vena cava filter can be effectively prevented through the structural design of the embodiment, the axial line of the vena cava filter is consistent and coincident with the axial line of a target blood vessel, and the thrombus filtering effect is effectively improved.

The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.

Claims

1. A recyclable vena cava filter, comprising: a recovery portion and at least 3 construction rods emanating from the recovery portion; the at least 3 construction rods form at least two thrombus filter screens, two supporting plates and a tail end structure through bending and shaping, wherein one thrombus filter screen is arranged between the recovery part and one supporting plate, the other thrombus filter screen is arranged at the waist part between the two supporting plates, the tail end structure is arranged at one end, far away from the thrombus filter screen, of the other supporting plate, the tail end structure comprises a plurality of free tail ends, and the free tail ends are obliquely bent and gathered towards the central axis of the vena cava filter;

the vena cava filter comprises a recovery part, a first thrombus filter screen, a first supporting disc, a second thrombus filter screen, a second supporting disc and a tail end structure which are sequentially arranged along the central axis of the vena cava filter, wherein one end of the recovery part is connected with the first thrombus filter screen, and the other end of the recovery part is a connecting part; one end of the first support disc is connected to the first thrombus filter screen, and the other end of the first support disc is closed and connected to the second thrombus filter screen; one end of the second support plate is closed and connected to the second thrombus filter screen, and the other end of the second support plate is open and connected to the tail end configuration; the first thrombus filter screen is distributed between the recovery part and the first support disc, and the second thrombus filter screen is distributed at the waist part of the closing-up part between the first support disc and the second support disc;

the second thrombus filter screen is formed by bending a plurality of construction rods around the central shaft of the vena cava filter and deviating from the axis of a preset distance to form a spatial staggered filter grid between the first support plate and the second support plate;

one end of the tail end configuration, which is far away from the second supporting disc, is set to be a transition arc tail end, and the transition arc tail end comprises a spherical tail end or a water-drop tail end; or one end of the tail end configuration, which is far away from the second supporting disc, is set as a transition softening tail end, the transition softening tail end comprises a transition section and a round tail end which are sequentially connected, and the transition section is a tapered transition section or comprises a softening transition section for winding a spring;

the construction rod comprises a main branch of the recovery part and a secondary branch construction rod, wherein the secondary branch construction rod comprises a primary branch construction rod and a secondary branch construction rod, and the secondary branch construction rod is a branch of the primary branch construction rod so as to form a multi-stage forked construction rod; each structural rod is branched into at least 2 secondary branch structural rods from the recovery part to the direction far away from the recovery part to form a single-stage or multi-stage branched structural rod, the opposite side of each branched structural rod forms a positive and negative S shape to further form two supporting plates, the structural rods emitted from the recovery part and the branched structural rods are mutually crossed or woven to form a thrombus filter screen with a grid structure before the supporting plates contacting with the blood vessel wall are formed for the first time, and the grid structure comprises a diamond shape or a circular shape;

the vena cava filter keeps the tail end of the construction rod free, when the vena cava filter is recovered, the vena cava filter is deformed and straightened when receiving the pulling force of the recovery part, at least 2 secondary branch construction rods converge and displace to the positive direction of the primary bifurcation construction rod, at least 2 secondary branch construction rods converge and displace to the positive direction of the primary branch of the recovery part, and then the vena cava filter is extracted and separated from the proliferation tissue.

2. The recyclable vena cava filter according to claim 1, wherein the recovery section is a self-centering recovery section comprising a centering umbrella, a connecting column and an internal thread, the centering umbrella is connected to the first thrombus filter through the connecting column, wherein the centering umbrella is a conical member with an open bottom, the conical opening of the conical member is directed away from the first thrombus filter, the connecting column is a cylinder, and the internal thread is disposed in the connecting column.

3. The retrievable vena cava filter according to claim 1 or 2, wherein a first thrombus filter is formed by bending a plurality of construction rods between the recovery section and a first support disc to form a conically curved filter, wherein one end of the plurality of construction rods is connected to the recovery section, the other end of the plurality of construction rods is connected to the first support disc in a diverging and bending manner and extends smoothly, and each construction rod is spaced from the other construction rod to form a curved rib-like filter mesh.

4. The recyclable vena cava filter according to claim 1 or 2, wherein the second thrombus filter is spatially staggered by a plurality of construction bars to form a thrombus filter structure having tensile deformation and convergent bundling properties.

5. The recyclable vena cava filter according to claim 1 or 2, wherein one end of the end configuration is continuously connected to the second support disc and the other end of the end configuration is axially bent, double bent or rolled free.