CN106667619B

CN106667619B - Recoverable arteries filter

Info

Publication number: CN106667619B
Application number: CN201710009526.XA
Authority: CN
Inventors: 刘丽文; 胡芮
Original assignee: Fourth Military Medical University FMMU
Current assignee: Fourth Military Medical University FMMU
Priority date: 2017-01-06
Filing date: 2017-01-06
Publication date: 2018-11-30
Anticipated expiration: 2037-01-06
Also published as: CN106667619A

Abstract

The invention discloses a kind of recoverable arteries filters, and including main strainer can compress radially or expansion, secondary strainer, main strainer includes support portion, obstruction portion and main interconnecting piece；The end in the obstruction portion is provided with contraction network interface, and the end face of the main interconnecting piece offers through-hole, shrinks the side that network interface is located at through-hole；The secondary strainer is umbrella-shaped structure in the deployed state, and secondary strainer is mounted on the secondary end for placing seal wire；Secondary strainer is when in a compressed state, and under the secondary promotion for placing seal wire, secondary strainer enters the main interior under unfolded state in turn through the through-hole, contraction network interface；It is provided on secondary strainer for the secondary interconnecting piece with the main interconnecting piece docking.The present invention is a kind of vascular filter of recoverable, can filter thrombus, cancer embolus or other tissue loss objects with mesh form, to reduce in art, postoperative embolic risk, increase operation safety, promoting patient's outcome has significant meaning.

Description

Recoverable arteries filter

Technical field

The present invention relates to a kind of operational tools, and in particular to it is a kind of be placed in it is in aorta, may filter that thrombus, cancer embolus or The recoverable vascular filter of other tissue loss objects.

Background technique

Ultrasound guidance is through apical hypertrophic cardiomyopathy interventricular septum radio-frequency ablation procedure and ultrasound guidance through chest cardiac tumor Radio-frequency ablation procedure has been applied in clinic as new technology, they are to pass through heart under color Doppler ultrasound guidance Probe carries out puncture prelocalization under long axis or short axis view guidance ray mode, radio-frequency electrode needle is fixed on puncture supporter, through chest Intercostal inserting needle by bone, sequentially passes through skin, subcutaneous tissue, pericardium, into pre- ablation site, for hypertrophic cardiomyopathy using warp The apex of the heart enters interventricular septum, and cardiac tumor is used and enters knurl through tumour basal part, and ultrasound is supervised in real time during inserting needle It surveys, is then fixed under power and melts using radio frequency, continue for some time, to achieve the purpose that treatment.

In order to prevent the thrombus being likely to occur for a period of time in radiofrequency ablation procedures or after RF ablation, cancer embolus or other groups Knit cast, especially ablation myocardium of ventricular septum or when left ventricle tumour occur left room thrombus, cancer embolus or other tissue loss with Blood flow enters aorta and then leads to the severe complication of cerebral embolism or its hetero-organization embolism, needs a kind of arteries filter group Part is placed on aorta ascendens, with mesh form filtering thrombus, cancer embolus or other tissue loss objects, without hindering aorta In blood flow, with achieve the purpose that prevent embolic complications.

Currently, artery filter is less in the vascular filter clinically applied, the overwhelming majority is vena cava filter, and can be divided For permanent filter and provisional filter.Permanent filter using more, implantation be fixed on vascular wall it is lifelong with human body, But it because it is resided in vivo for a long time as foreign matter, needs to take anticoagulant throughout one's life, and is likely to occur displacement, perforation or local blood Bolt such as forms at the complication；And provisional filter, that is, recoverable filter, it can be recycled take out after a period of use in vivo, in turn Permanent filter bring complication is avoided, but because the problems such as angiosynizesis, package will lead to filter recycling difficulty again.Together When, existing artery filter is applied to lesion on the arch of aorta, can prevent cerebral embolism, but it is difficult all to there is recycling, blood when recycling The problems such as bolt is easily overflowed, is fallen off.

It can be seen that existing vascular filter is not suitable for solving current problem at present, a kind of new blood vessel filter is needed Device, especially a kind of aorta that is placed in is without hindering aortic flow to may filter that thrombus, cancer embolus or other tissue loss objects Recoverable vascular filter.

Summary of the invention

For above-mentioned problems of the prior art, the object of the present invention is to provide a kind of recoverable arterial bloods Pipe filter, is placed in aorta, and thrombus, cancer embolus or other tissue loss objects are filtered in the form of strainer, without hindering actively Blood flow in arteries and veins can prevent the generation of the complication such as embolism, and use recoverable structure, can be by filter together with filtrate one Play recycling.

In order to realize that above-mentioned task, the present invention use following technical scheme：

A kind of recoverable arteries filter, it is main including main strainer can compress radially or expansion, secondary strainer Strainer includes support portion, obstruction portion and main interconnecting piece, wherein support portion, obstruction portion are an integral structure, one end of support portion It is penetrating, it is connected to inside support portion and obstruction portion；The end in the obstruction portion is provided with contraction network interface, the main interconnecting piece End face offers through-hole, shrinks the side that network interface is located at through-hole；

The secondary strainer is umbrella-shaped structure in the deployed state, and secondary strainer is mounted on the secondary end for placing seal wire； Secondary strainer is when in a compressed state, and under the secondary promotion for placing seal wire, secondary strainer is in turn through the through-hole, contraction network interface Enter the main interior under unfolded state；It is provided on secondary strainer for the pair with the main interconnecting piece docking Interconnecting piece.

Further, the main strainer is when in a compressed state, is located in Arterial sheath, the circumference of main strainer by To Arterial sheath inner wall limitation and cannot be unfolded；Dismountable main placement seal wire is provided on the main interconnecting piece, when dynamic After vein sheath pipe reaches in aorta, main strainer is released from Arterial sheath front end using main placement seal wire, at this time the week of main strainer Be unfolded to limitation is lost, the support portion and aorta inner wall Elastic Contact.

Further, the secondary strainer is when in a compressed state, is located in a secondary strainer sheath, the secondary connection Portion is sleeved on outside secondary strainer sheath, and secondary strainer sheath can be moved axially relative to secondary interconnecting piece；The main interconnecting piece, it is secondary even After socket part docking, secondary strainer sheath is pushed, after so that the front end of secondary strainer sheath is passed through the through-hole, struts the contraction net Mouth simultaneously enters main interior, recycles secondary placement seal wire to release secondary strainer from secondary strainer sheath front end, at this time pair strainer Circumferential direction lose limitation and main interior be unfolded.

Further, the main interconnecting piece is tube-shaped structure, and one end of main interconnecting piece is penetrating, and the other end is provided with solid Fixed board, the through-hole are provided in fixed plate；Main interconnecting piece is internally provided with internal screw thread, before the main placement seal wire End is provided with the first external screw thread with the screw-internal thread fit.

Further, the secondary interconnecting piece is docked by the way of magnetic attracting with main interconnecting piece：The pair Interconnecting piece front end is magnetic texure, and the main interconnecting piece is metal structure.

Further, the secondary interconnecting piece front end is provided with the second external screw thread with the screw-internal thread fit.

Further, the diameter of the main placement seal wire is 4~5mm, after the expansion of main strainer along axial length be 2~ 4cm。

Further, the support portion of the main strainer, obstruction portion are worked out by medical niti-shaped memorial alloy silk, The support portion of main strainer, obstruction portion collectively form funnel-shaped structure in the deployed state, wherein and the outer diameter of support portion is consistent, from The variation tendency of support portion to obstruction portion outer diameter is：Reduction, increase reduce again, and the receipts are finally formed in the end in obstruction portion Contracting network interface.

The present invention has following technical characterstic compared with prior art：

1. the present invention is a kind of vascular filter component of recoverable, can be filtered with mesh form thrombus, cancer embolus or other Tissue loss object is placed in aorta, especially aorta ascendens, suitable for radiofrequency ablation procedures or at latter section of RF ablation Between, the generation of the prevention complication such as embolism, to reduce in art, postoperative embolic risk, increase operation safety, promote patient's prognosis Effect has significant meaning, while causing patient's potential risk to have protective effect certain uncertain factors；

2. the configuration of the present invention is simple can carry out good cooperation with existing surgical instrument, controllability is good in use process, Each operating process is convenient and accurate, the blank in the field has been filled up, to provide a kind of matched impurity for radio-frequency ablation procedure Component is recovered by filtration, surgical effect can be significantly improved, and provide new reference thinking and development for the Therapy study in the field Direction.

Detailed description of the invention

Fig. 1 is that main strainer is located at structural schematic diagram when in a compressed state in Arterial sheath；

Fig. 2 is structural schematic diagram when main strainer is released from Arterial sheath front end in unfolded state；

Fig. 2-1 is the end structure illustration of main strainer；

Fig. 2-2 is the structural schematic diagram of main interconnecting piece；

Fig. 3 is main interconnecting piece and the main structural schematic diagram placed when seal wire separates；

Fig. 4 is the structural schematic diagram before secondary interconnecting piece and the docking of main interconnecting piece；

Fig. 5 is the structural schematic diagram after secondary interconnecting piece and the docking of main interconnecting piece；

Fig. 6 is that secondary strainer sheath passes through the structural schematic diagram shunk when network interface is pushed into main strainer；

Fig. 7 is structural schematic diagram of the secondary strainer after main interior opening；

Structural schematic diagram when Fig. 8 is main strainer, secondary strainer recycles jointly；

Figure label represents：1-main strainer, 101-support portions, 102-obstruction portions, 2-Arterial sheaths, 3-main connections Portion, 4-main placement seal wires, 5-internal screw threads, 6-fixed plates, 7-shrink network interface, 8-through-holes, 9-clamping rings, 10-secondary connections Portion, the 11-the second external screw thread, 12-secondary strainer sheaths, 13-secondary strainers, 14-secondary placement seal wires.

Specific embodiment

Existing vascular filter is vein blood vessel filter, and the flow direction of venous blood is to flow to heart by limbs, therefore only need stock Vein is implanted into a strainer, i.e., such as the secondary strainer direction of this programme, withdraws after placement.

And this programme is designed as aorta vessel filter, the flow direction of arterial blood is that limbs are flowed to by heart, is placed in strainer side The main strainer direction in for this programme, but need to be pulled backward when recycling, there are the risks that filtrate is omitted, therefore need to add secondary filter Net constitutes clad structure, to complete filter recycling and prevent filtrate from omitting.

In compliance with the above technical solution, as shown in Figures 1 to 8, a kind of recoverable arteries filter, including can be in radial direction Upper compression or expansion main strainer 1, secondary strainer 13；In the present invention, main strainer 1 and secondary strainer 13 are reticular structure, are had Elasticity, elasticity here refer under the action of by external pressure, can compress radially, make main strainer 1 and secondary strainer 13 Reduce outer diameter, in order to reach blood vessel predetermined position by sheath, and after losing the constraint of external force, main strainer 1, secondary strainer 13 It is deployable at nature, i.e. unfolded state.That is, main strainer 1, secondary strainer 13 have automatic extensive under the action of elastic force Shaped ability is restored, some medical materials, such as niti-shaped memorial alloy or other memory alloy materials etc. are able to satisfy Above-mentioned requirements.When blood with impurity flows through main strainer 1, thrombus, cancer embolus and other tissue loss objects etc. are hindered by main strainer 1 It blocks, stays in main strainer 1, and blood passes through main strainer 1 and continues to flow.

As shown in Figure 1, main strainer 1 includes support portion 101, obstruction portion 102 and main interconnecting piece 3, wherein support portion 101, Obstruction portion 102 is an integral structure, and one end of support portion 101 is penetrating, is connected to inside support portion 101 and obstruction portion 102；With miscellaneous The blood of matter enters inside main strainer 1 from the penetrating one end of support portion 101, and is finally blocked in obstruction portion 102.It stops The outer diameter in portion 102 is less than the outer diameter of support portion 101, and support portion 101 connects after the expansion of entire strainer with aortic blood inside pipe wall Touching is played the role of blocking blood vessel while fixed main strainer 1 comprehensively.The end in the obstruction portion 102 is provided with contraction network interface 7, contraction network interface 7 here is an elastic network interface, and specifically, shrinking network interface 7 includes a bullet circle, in its natural state, The internal diameter very little of bullet circle, and bullet circle can also strut under the effect of external force, and the internal diameter of bullet circle is made to become larger, and be similar to oversleeve Cuff portion.The end face of the main interconnecting piece 3 offers through-hole 8, shrinks the side that network interface 7 is located at through-hole 8；The through-hole 8 provide a channel for the traveling of secondary strainer 13, and obstruction portion 102 carries out in the circumferential direction in obstruction portion 102 with main interconnecting piece 3 Connection forms clamping ring 9, to guarantee the stable connection of the two, the side above-mentioned shunk network interface 7 and be located at through-hole 8, i.e. obstruction portion 102 and a loop diameter of 3 upper mounted plate of main interconnecting piece, 6 junction be greater than the diameter of through-hole 8, make junction not and influence to shrink network interface 7 opening or contraction.

Main strainer 1 is when in a compressed state, is located in an Arterial sheath 2, the circumference of main strainer 1 is by Arterial sheath 2 The limitation of inner wall and cannot be unfolded；This Arterial sheath 2 is used for and interventional operation equipment matches, and main strainer 1 is transported to pre- Fixed position, while main strainer 1 also being made to keep compressive state；Dismountable main placement is provided on the main interconnecting piece 3 to lead Silk 4 is released main strainer 1 from 2 front end of Arterial sheath using main placement seal wire 4 after Arterial sheath 2 reaches in aorta, this When main strainer 1 circumferential direction lose limitation and be unfolded, the support portion 101 and aorta inner wall Elastic Contact；Here elasticity Contact refers to that the outer diameter of support portion 101 is somewhat larger compared with the internal diameter of blood vessel, so that main strainer 1 is effectively blocked blood vessel, avoids leading Strainer 1 leaves gap between main strainer 1 and vascular wall after being unfolded.

The secondary strainer 13 is umbrella-shaped structure in the deployed state, and secondary strainer 13 is mounted on a secondary placement seal wire 14 End；The effect of secondary strainer 13 is, when main strainer 1 is recycled, coats main 1 self-filtering of strainer jointly with main strainer 1 Impurity, impurity enters in blood when preventing main strainer 1 from recycling.Secondary strainer 13 is when in a compressed state, places seal wire 14 in pair Promotion under, secondary strainer 13 in turn through the through-hole 8, shrink network interface 7 enter the main strainer 1 under unfolded state It is internal；It is provided on secondary strainer 13 for the secondary interconnecting piece 10 with the docking of main interconnecting piece 3.

Secondary strainer 13 is when in a compressed state, is located in a secondary strainer sheath 12, the secondary interconnecting piece 10 is sleeved on Outside secondary strainer sheath 12, secondary strainer sheath 12 can be moved axially relative to secondary interconnecting piece 10, i.e., the two is not connected to, and only be covered Dress relationship；After the main interconnecting piece 3, secondary interconnecting piece 10 dock, secondary strainer sheath 12 is pushed, the front end of secondary strainer sheath 12 is made It after the through-hole 8, struts the contraction network interface 7 and enters inside main strainer 1, recycle secondary seal wire 14 of placing will Secondary strainer 13 is released from secondary 12 front end of strainer sheath, and the circumferential direction of secondary strainer 13 loses limitation and is unfolded inside main strainer 1 at this time.

As shown, one end of main interconnecting piece 3 is penetrating, the other end in the present solution, main interconnecting piece 3 is tube-shaped structure It is provided with fixed plate 6, the through-hole 8 is provided in fixed plate 6；Main interconnecting piece 3 is internally provided with internal screw thread 5, described The main front end for placing seal wire 4 is provided with the first external screw thread cooperated with the internal screw thread 5, in this way by turning to different directions The main connection or disassembly for placing seal wire 4 and main interconnecting piece 3 can be realized in main placement seal wire 4.

Main strainer 1 needs first to carry out the merging of secondary strainer 13 when being recycled, when merging, an important ring Section is exactly to dock the secondary interconnecting piece 10 of secondary strainer 13 with main strainer 1.In the present solution, secondary interconnecting piece 10 and main interconnecting piece 3 It is docked by the way of magnetic attracting：10 front end of secondary interconnecting piece is magnetic texure, such as before secondary interconnecting piece 10 End setting magnet circle, or magnetized secondary 10 front end of interconnecting piece using magnet using preceding, so that its band is magnetic；Described Main interconnecting piece 3 is metal structure, main interconnecting piece 3 or magnetic texure, as long as guaranteeing that the two can be attracted；Secondary interconnecting piece The shape of 10 front ends matches with main interconnecting piece 3, when secondary interconnecting piece 10 is close to main interconnecting piece 3, in the guiding and actuation of magnetic force Under effect, it will can be easily carried out the docking of main interconnecting piece 3 and secondary interconnecting piece 10.

After docking due to main interconnecting piece 3, secondary interconnecting piece 10, need to carry out the conveying of secondary strainer 13, for the company for keeping the two Connect it is firm, in the present solution, secondary 10 front end of interconnecting piece is provided with the second external screw thread 11 cooperated with the internal screw thread 5；Both i.e. After docking, then secondary interconnecting piece 10 is turned, keeps main interconnecting piece 3, secondary interconnecting piece 10 sealed using screw thread, push secondary strainer forward in this way When sheath 12, the position of main strainer 1 would not change.

The course of work of the invention is described with reference to the drawings：

Note：In order to more clearly show structure of the invention, tubular structure involved in attached drawing, be the shape of axial section view Formula is embodied.

As shown in Figure 1, the composed structure of main 1 part of strainer is illustrated, mainly by main strainer 1, main interconnecting piece 3, master Place seal wire 4 and Arterial sheath 2.Fig. 1 is state of the main strainer 1 when being located in Arterial sheath 2, at this time the circumference of main strainer 1 by To the limitation of sheath tube wall, main strainer 1 is in compressive state.In the present embodiment, the support portion 101 of main strainer 1, obstruction portion 102 by Niti-shaped memorial alloy silk is worked out with web form, i.e., is first compiled into net circle in a circumferential direction, then axially extend, Outer diameter is adjusted while extension, ultimately forms main 1 structure of strainer.As shown in Fig. 2, the support portion 101 of main strainer 1, obstruction portion 102 Funnel-shaped structure is collectively formed in the deployed state, wherein the outer diameter of support portion 101 is consistent, self-supporting portion 101 to obstruction portion The variation tendency of 102 outer diameters is：Reduction, increase reduce again, the two smooth transition, and obstruction portion 102 is made to form pocket shape structure, with Accommodate more impurity；Simultaneously as the outer diameter in obstruction portion 102 is less than support portion 101, therefore will not be miscellaneous due to inside aggregation Matter and influence normal blood flow；Braided material above-mentioned, i.e., the medical niti-shaped memorial alloy silk used in the present embodiment The contraction network interface 7 is finally formed in the end in obstruction portion 102；That is braided material is when working out to the end, constantly in diminution Diameter, the final molding that end is carried out using a bullet circle, bullet circle is fixed the end of braided material, simultaneously because its bullet Property effect so that its formed shrink 7 structure of network interface.In the present embodiment, main interconnecting piece 3, main placement seal wire 4 are all made of superslide coating Stainless steel material, wherein it is main place seal wire 4 diameter be 4~5mm, preferably 4.826mm, i.e., 0.19 inch, the arterial sheath of use The specification of pipe 2 is 18F.

2 percutaneous puncture of Arterial sheath is entered into femoral artery, sheath is constantly adjusted and drives in the wrong direction to aorta ascendens, later in sheath It is sent into main strainer 1 and reaches state as shown in Figure 1, further release main placement seal wire 4 as shown by arrows, make main strainer 1 from artery It is discharged in sheath 2, main strainer 1 automatically opens, as shown in Figure 2.

In the present embodiment, the length after the main expansion of strainer 1 along axial direction is 2~4cm, preferably 3cm, the maximum of main strainer 1 Depending on diameter is with aorta diameter, generally 2~4cm, preferably 3.5cm；In main strainer 1, the length in obstruction portion 102 is 1cm, Diameter is 1cm, and when main strainer 1 is fixed with active inner vessel wall, main strainer 1 is placed and completed；The outer diameter of main interconnecting piece 3 be 4~ 5mm, preferably 4.826mm, i.e., 0.19 inch, internal diameter 4mm, length 4mm.The main specification for placing seal wire 4 and main interconnecting piece 3 Match, i.e. 4~5mm of outer diameter, nose threads structure length is 4mm.

After the completion of main strainer 1 is placed, main placement seal wire 4 is rotated counterclockwise, is made between main placement seal wire 4 and main interconnecting piece 3 Helicitic texture separate, as shown in figure 3, exiting Arterial sheath 2 and main placement seal wire 4 together at this time.

As shown in figure 4, illustrating the structure composition of secondary strainer 13, secondary 12 specification of strainer sheath that secondary strainer 13 is used is 9F, secondary strainer 13 and secondary interconnecting piece 10 are all made of superslide coating stainless steel material, wherein the diameter that pair places seal wire 14 is 0.5~1mm, preferably 0.9652mm, i.e., 0.038 inch.When placing secondary strainer 13, the Arterial sheath 2 of 18F above-mentioned is needed to match It closes.

2 percutaneous puncture of Arterial sheath is entered into femoral artery, sheath is constantly adjusted and drives in the wrong direction to the main strainer 1 close to aorta ascendens Place is sent into 13 part of pair strainer in sheath later and forms state as shown in Figure 4, further releases secondary connect simultaneously as shown by arrows Socket part 10, secondary strainer sheath 12 and secondary placement seal wire 14.Secondary interconnecting piece 10 is tube-shaped structure, has magnetism, can automatic butt Main interconnecting piece 3 rotates clockwise secondary interconnecting piece 10 after docking, so that its helicitic texture between main interconnecting piece 3 is connected, such as Fig. 5 Shown in institute.

After secondary strainer sheath 12 and secondary placement seal wire 14 are released simultaneously, the through-hole 8 of main 3 end of interconnecting piece may pass through, and support It opens and shrinks network interface 7, make secondary 12 front end of strainer sheath exposure, as shown in fig. 6, secondary strainer sheath 12 exceeds main interconnecting piece 3 at least 1cm, thrombus, cancer embolus or the secondary of other tissue loss objects when secondary strainer 13 can be effectively prevent to open fall off.Further such as arrow Secondary placement seal wire 14 is released shown in head, automatically opens secondary strainer 13.

After releasing secondary placement seal wire 14, secondary strainer 13 is automatically opened, and secondary 13 length of strainer is 1cm, and maximum gauge is with main filter Depending on 1 diameter of net, generally 2~4cm, preferably 3.5cm；Secondary 10 length of interconnecting piece is 4mm, and the diameter that pair places seal wire 14 is 0.5~1mm, preferably 0.9652mm, i.e., 0.038 inch.As shown in fig. 7, whole exit secondary interconnecting piece 10, secondary 12 and of strainer sheath Pair places seal wire 14, can make the other structures recycled in its entirety in addition to Arterial sheath 2.

When arteries filter is integrally retracted into Arterial sheath 2, thrombus, cancer embolus or other tissue loss objects are fixed on master Be recovered together between strainer 1 and secondary strainer 13, it is whole at this time to exit Arterial sheath 2, achievable arteries filter it is complete Recycling.

Claims

1. a kind of recoverable arteries filter, which is characterized in that including main strainer can compress radially or expansion (1), secondary strainer (13), main strainer (1) includes support portion (101), obstruction portion (102) and main interconnecting piece (3), wherein support Portion (101), obstruction portion (102) are an integral structure, and one end of support portion (101) is penetrating, support portion (101) and obstruction portion (102) internal connection；The end in the obstruction portion (102), which is provided with, shrinks network interface (7), the end of the main interconnecting piece (3) Face offers through-hole (8), shrinks the side that network interface (7) are located at through-hole (8), obstruction portion (102) and main interconnecting piece (3) are in obstruction portion (102) it is attached, is formed clamping ring (9) in circumferential direction；

The secondary strainer (13) is umbrella-shaped structure in the deployed state, and secondary strainer (13) is mounted on secondary placement seal wire (14) End；Secondary strainer (13) is when in a compressed state, under the secondary promotion for placing seal wire (14), secondary strainer (13) in turn through The through-hole (8), shrinking network interface (7), to enter the main strainer (1) under unfolded state internal；It is set on secondary strainer (13) It is equipped with for the secondary interconnecting piece (10) with main interconnecting piece (3) docking.

2. recoverable arteries filter as described in claim 1, which is characterized in that the main strainer (1) is in pressure When contracting state, be located in Arterial sheath (2), the circumference of main strainer (1) limited by Arterial sheath (2) inner wall and cannot Expansion；Dismountable main placement seal wire (4) is provided on the main interconnecting piece (3), when Arterial sheath (2) reach in aorta Afterwards, main strainer (1) is released from Arterial sheath (2) front end using main placement seal wire (4), the circumferential direction of main strainer (1) loses at this time It limits and is unfolded, the support portion (101) and aorta inner wall Elastic Contact.

3. recoverable arteries filter as described in claim 1, which is characterized in that the secondary strainer (13) is in pressure When contracting state, it is located in a secondary strainer sheath (12), the secondary interconnecting piece (10) is sleeved on secondary strainer sheath (12) outside, Secondary strainer sheath (12) can move axially relative to secondary interconnecting piece (10)；The main interconnecting piece (3), secondary interconnecting piece (10) are docked Afterwards, secondary strainer sheath (12) is pushed, after so that the front end of secondary strainer sheath (12) is passed through the through-hole (8), struts the receipts It is internal that contracting network interface (7) simultaneously enters main strainer (1), recycles and secondary places seal wire (14) for secondary strainer (13) from secondary strainer sheath (12) front end is released, and the circumferential direction of secondary strainer (13) loses limitation and is unfolded inside main strainer (1) at this time.

4. recoverable arteries filter as claimed in claim 2, which is characterized in that the main interconnecting piece (3) is circle One end of tubular-shaped structures, main interconnecting piece (3) is penetrating, and the other end is provided with fixed plate (6), and the through-hole (8) is provided with fixation On plate (6)；Main interconnecting piece (3) is internally provided with internal screw thread (5), and the front end of the main placement seal wire (4) is provided with and institute First external screw thread of internal screw thread (5) cooperation stated.

5. recoverable arteries filter as described in claim 1, which is characterized in that the secondary interconnecting piece (10) and master Interconnecting piece (3) is docked by the way of magnetic attracting：Secondary interconnecting piece (10) front end is magnetic texure, the master Interconnecting piece (3) is metal structure.

6. recoverable arteries filter as claimed in claim 4, which is characterized in that described secondary interconnecting piece (10) front end It is provided with the second external screw thread (11) with the internal screw thread (5) cooperation.

7. recoverable arteries filter as claimed in claim 2, which is characterized in that the main placement seal wire (4) Diameter is 4~5mm, and the length after main strainer (1) expansion along axial direction is 2~4cm.

8. recoverable arteries filter as described in claim 1, which is characterized in that the support of the main strainer (1) Portion (101), obstruction portion (102) are worked out by niti-shaped memorial alloy silk, the support portion (101) of main strainer (1), obstruction portion (102) funnel-shaped structure is collectively formed in the deployed state, wherein the outer diameter of support portion (101) is consistent, self-supporting portion (101) Variation tendency to obstruction portion (102) outer diameter is：Reduction, increase reduce again, are finally formed in the end of obstruction portion (102) described Contraction network interface (7).