CN207545262U - The vena cava filter of multiple filtration - Google Patents

Abstract

The utility model discloses a kind of vena cava filters of multiple filtration, include the filtration members of at least two axially spaced-aparts arrangement, the connecting rod for connecting two filtration members is equipped between adjacent filtration members；Each filtration members are to be crimped and respectively put to distal exterior extension and gradually reverse flip from center to be supported on blood vessel.The defects of being discharged for filter in the prior art through femoral vein and causing uncontrollable release process, easy damaged vascular wall the problem of spring and position inaccurate easily occurs, the utility model provides a kind of two-way controlled release, both it can be implanted into and recycle through femoral vein, it can be implanted into again through jugular vein with recycling, having simultaneously preferably from centrality, it is easier to the vena cava filter of the multiple filtration of captured recycling.

Description

The vena cava filter of multiple filtration

Technical field

The utility model belongs to the field of medical instrument technology, is related to a kind of filter more particularly to a kind of chamber of multiple filtration Venous filter.

Background technology

Pulmonary embolism (PE) is common health problem, and is to lead to a dead key factor in all age cohorts.Greatly Most pulmonary embolism are caused by lower limb or endopelvic deep vein thrombosis (DVT), and the blood clot of deep vein thrombosis may pass through vein Migrate back to heart and enter lung in, so as to due to lose the part for leading to lung blood and oxygen supply and lung is caused to obstruct Plug.

As shown in Figure 1, there are a kind of vena cava filter of the multiple filtration of double layered cone filter structure, the filter in the prior art The shortcomings that device is：When filter is discharged through stock, release process is uncontrollable, and after filter releases sheath, strainer flicks rapidly, hair Raw spring, such filter position inaccurate, and the process flicked also easily stabs vascular wall.If after stock discharges, filter does not have Have and open that either position inaccurate strut tangles or filter tilts completely, be then just difficult to recycle filter and discharged again, remove Non- recycled through neck is taken out, and can just be discharged again.Meanwhile vein blood vessel would generally cause size constantly to occur with breathing Variation, when blood vessel is squeezed, strut terminal position easily pierces through vascular wall and causes to perforate, and damages vascular wall, such case It is existing in the literature to have many reports.Another drawback is that filter can only be recycled through jugular vein, and under regular situation, filter Device is implanted into from femoral vein, and in this case, patient's jugular vein and femoral vein are required for that there are one points of puncture, increase indirectly The risk of infection is added, there is also certain limitations on..

Utility model content

The technical problem to be solved by the present invention is to, discharged for double-deck filter of the prior art through femoral vein, And easily occur spring and the defects of the problem of position inaccurate causes uncontrollable release process, easy damaged vascular wall, this reality With a kind of two-way controlled release of novel offer, not only it can be implanted into and recycle through femoral vein, but also can be implanted into and recycle through jugular vein, Have preferably from centrality simultaneously, it is easier to the vena cava filter of the multiple filtration of captured recycling.

Technical solution is used by the utility model solves its technical problem：

A kind of vena cava filter of multiple filtration includes the filtration members of at least two axially spaced-aparts arrangement, adjacent filtering The connecting rod for connecting filtration members is equipped between part；

Each filtration members are to extend from center to distal exterior and gradually reverse flip crimps and respectively point It is supported on blood vessel.

In the vena cava filter of the multiple filtration, preferably described filtration members include at least three from center to external radiation Strut and all struts axisymmetricly arrange；The axis wire clamp of the tangent line and filtration members of the strut end or strut end Angle beta >=180 °.

In the vena cava filter of the multiple filtration, preferably every strut is included successively from center to external radiation First supporting section, the second supporting section；

In the vena cava filter of the multiple filtration, each point cuts on preferably described first supporting section or the first supporting section The angle α of line and filtration members central axes is 0~90 °, the tangent line of each point and central axes on the second supporting section or the second supporting section Angle β >=90 °, and angle β >=180 ° of the tangent line and central axes of the second supporting section end or end；First supporting section and second Angle γ >=180 ° of each point tangent line on angle or the first supporting section and the second supporting section between supporting section；The of the strut 2 supporting section points are supported on blood vessel.

In the vena cava filter of the multiple filtration, the second supporting section of preferably described strut includes the first subsegment, the Two subsegments and third subsegment；

Wherein, the radius of curvature of the second subsegment is less than the first subsegment, and the angle β of the second subsegment and central axes is by 90 °≤β 180 ° of ＜ is transitioned into β >=180 °, forms the point contact with intravascular wall surface；

Or second subsegment be curve or broken line, form opening towards the C fonts of central axes or V-shaped structure, the second son Section forms point contact with intravascular wall surface, and the first subsegment and third subsegment are straight line or broken line, and the second supporting section is whole backwards Filtration members are bent towards filtration members.

In the vena cava filter of the multiple filtration, the strut of preferably adjacent two filtration members with interlocking in the axial direction Arrangement.

In the vena cava filter of the multiple filtration, the strut of preferably same filtration members is staggered in the axial direction, Form bilayer or multilayer structure.

In the vena cava filter of the multiple filtration, preferably described connecting rod is with support force and with compliance Flexible jointing-rod；

Or the connecting rod includes the first connection unit and the second connection unit, first connection unit and second connect It is connected between order member by universal joint and supports positioning；

Or the connecting rod includes the first connection unit, the second connection unit and transition piece, first connection Unit is hinged with the second connection unit with transition piece respectively, and the first connection unit and the second connection unit are respectively at two Mutually perpendicular direction upper limit rotates and supports positioning.

In the vena cava filter of the multiple filtration, preferably described connecting rod is integrated knot at least one filtration members Structure, connecting rod are extended to form by the filtration members are central axial.

In the vena cava filter of the multiple filtration, preferably described filter, which further includes, to be used to support on wall in the blood vessels Support element, the support element from connecting rod gradually to extension on the outside of an axial direction, put down by end and the central axes of support element Row is turned down to central axes direction.

In the vena cava filter of the multiple filtration, the vena cava filter of preferably described multiple filtration further includes recycling Portion, the recoverer are connected in filtration members.

In the vena cava filter of the multiple filtration, preferably described filtration members are equipped with to be anchored on wall in the blood vessels Anchor thorn, the angle between anchor thorn and the central axes of filtration members is 90 ° ± 10 °.

In the vena cava filter of the multiple filtration, the strut of preferably described filtration members is cross-linked with each other, and at crosslinking Crosslinking node is formed, the outermost node that is crosslinked is end crosslinking node, and the maximum spacing between the end crosslinking node is not More than blood vessel diameter.

The filter of the utility model is either discharged through stock or is discharged through neck, and the filtration members in filter are gradually released by end It puts, and the outside overturning first reversely curling during release due to filtration members, will not be pierced on blood vessel, each filtration members It can slowly open, avoid emitting filter in the prior art, the problem of filter strut bounces and impacted to vascular wall；Simultaneously such as Fruit release is unsuccessful, and the utility model filter can also recycle, and be discharged again, and entire release and reclaimer operation are simple, just It is prompt.

The filter of the utility model can provide two kinds of options, and improve hand with two-way controlled release for operator The controllability of art operation.Due to the filter whether positive implantable intravascular or being inverted implantable intravascular can have of the utility model Preferable filter effect is either implanted into so the filter of the utility model is either implanted into through femoral vein through jugular vein, is recycled Hook can all be located at one end of operator, when transport system connection recycling is hooked into row implantation filter, it is possible to realize filter The controlled release function of recycling repeatedly is discharged repeatedly.

The strut end of the utility model is not contacted with vascular wall, is effectively prevented vascular wall and is perforated, and the filtering of strut Part point and vascular wall point contact, inner membrance is climbed cover after covering filter position it is smaller, endangium is not caused when recycling filter Big damage, therefore extend recovery time window.

The utility model filter is used is equipped with filtration members in two positions at interval, is formed and stablizes support, has filter It preferably from center performance, prevents filter from tilting, effectively avoids recovering hook adherent, be more advantageous to recovering hook and arrested and recycle filter Device.

Description of the drawings

Below in conjunction with accompanying drawings and embodiments, the utility model is described in further detail, in attached drawing：

Fig. 1 is prior art construction schematic diagram；

Fig. 2 is the structure diagram of the utility model embodiment 1；

Fig. 3 is the vertical view of Fig. 1；

Fig. 4 is the implanting state schematic diagram of the first the implantable intravascular mode of the utility model embodiment 1；

Fig. 5 is the implanting state schematic diagram of second of the implantable intravascular mode of the utility model embodiment 1；

Fig. 6 is the structure diagram of 1 strut of the utility model embodiment；

Fig. 7 is the structure diagram of the utility model embodiment 1 filtration members, second of embodiment；

Fig. 8 is the structure diagram of 1 filtration members the third embodiment of the utility model embodiment；

Fig. 9 is the structure diagram of the 4th kind of embodiment of 1 filtration members of the utility model embodiment；

Figure 10 is 2 structure diagram of the utility model embodiment；

Figure 11 is the structure diagram under the utility model embodiment 3 is bent；

Figure 12 is the structure diagram of the utility model embodiment 3；

Figure 13 is the structure diagram of 3 connecting rod the first embodiment of the utility model embodiment；

Figure 14 is the structure diagram of the utility model embodiment 3 connecting rod, second of embodiment；

Figure 15 is the structure diagram of 3 connecting rod the third embodiment of the utility model embodiment；

Figure 16 is the structure diagram of the utility model embodiment 4；

Figure 17 is the vertical view of Figure 16；

Figure 18 is the structure diagram at the filter release process supporting rod release initial stage of the utility model embodiment 1；

Figure 19 is the structure diagram of the filter release process supporting rod release mid-term of the utility model embodiment 1；

Figure 20 is the structure diagram in the filter release process supporting rod release later stage of the utility model embodiment 1.

Specific embodiment

For a clearer understanding of the technical features, objectives and effects of the utility model, now control attached drawing is detailed Illustrate specific embodiment of the present utility model.

Since no matter how instrument is implanted into, recovering hook is in proximal end (instrument leans on one end of proximal operator), therefore side always Position definition：Distally refer to the direction far from operator, proximal end refers to the direction by proximal operator.Central axes refer to filter central axes, simultaneously It is also the central axes of the first support portion, filter house and the second support portion.

Controlled release：In surgical procedure filter discharge position is undesirable or the state of filter expansion is undesirable, Filter can be withdrawn again and enters conveying sheath, and is repositioned and discharged.

Embodiment 1, as shown in figs. 2-9, a kind of vena cava filter of multiple filtration, the mistake of at least two axially spaced-aparts arrangement Part 1200 is filtered, the connecting rod 1100 for connecting two filtration members 1200 is equipped between adjacent filtration members 1200；It is each described Filtration members 1200 all be by center in an axial direction in a direction extend outward and gradually reverse flip crimp and respectively Point is supported on blood vessel.

The filter of the utility model includes at least three parts：Two filtration members 1200, two filtration members 1200 of a connection Connecting rod 1100.The quantity of filtration members 1200 can also carry out increasing 1-3 according to actual conditions, multiple filtration members 1200 Between connected by connecting rod 1100,1200 basic structure of all filtration members of the utility model is identical, and filtration members 1200 are by propping up Bar forms, and only has any different in strut 1200a quantity, size (thickness, overall size etc.).

Strut 1200a is axisymmetricly arranged from center to external radiation and all strut 1200a, the branch of filtration members 1200 Bar 1200a quantity is at least three, and there are two filtration members 1200, a filtration members 1200 in Fig. 2 to use six roots of sensation strut 1200a, One filtration members 1200 is all arranged using 12 struts 1200a, all strut 1200a about central axes axial symmetry.

As shown in Fig. 2,3,4,6, in the tangent line of the strut 1200a ends or strut 1200a ends and filtration members 1200 Angle β >=180 ° of axis, (it is farthest with respect to central axes that maximum outside diameter refers to strut 1200a to the 1200 maximum outside diameter D of filtration members Point forms diameter of a circle, D：Using central axes as the first boundary line, strut 1200a is with respect to the farthest point and the first side of the first boundary line Twice of distance between boundary line) coordinate unanimously with vessel diameter so that the strut 1200a points are supported on blood vessel 2000. During release, strut 1200a stretches in the blood vessels, no matter which type of structure strut 1200a is, back stay is completed in release Angle β >=180 ° of the tangent line and central axes of 1200a ends or strut 1200a ends, such strut 1200a ends are staggered blood Inside pipe wall 2000, at least with 2000 parastate of blood vessel, strut 1200a ends will not puncture blood vessel 2000.

As shown in fig. 6, different according to the different location shape and structure of strut 1200a and effect, strut 1200a is main It is divided into two parts, the strut 1200a is included successively from the first supporting section 1210 from center to external radiation, the second supporting section 1230, changeover portion 1220 is also provided between the first supporting section 1210, the second supporting section 1230, this three sections with different knots Structure, shape and length are all different.The tangent line of each point on wherein described first supporting section, 1210 or first supporting section 1210 Angle with central axes is that α is 0~90 °, and on the second supporting section 1230 or the second supporting section 1230 each point tangent line and axis The angle β of line is 90 ° of β ＞, simultaneously as strut 1200a ends are the end of the second supporting section 1230, then the second supporting section The tangent line of 1230 ends or end and central axes angle β >=180 °.After such structure can ensure strut 1200a releases, branch Overturning curling just occurred before adherent for bar 1200a ends, and flip angle reaches 180 ° or more.First supporting section, 1210 end Collect and be fixed together, the second supporting section 1230 is the latter end of strut 1200a.

It is each on angle or the first supporting section and the second supporting section between first supporting section 1210 and the second supporting section 1230 Angle γ >=180 ° of point tangent line, then the second supporting section 1230 is reverse flip, changeover portion 1220 for the first supporting section 1210 with Transition between second supporting section 1230, therefore, the length and shape of changeover portion 1220 are according to the first supporting section 1210 and second The shape of supporting section 1230 determines, in favor of seamlessly transitting between the first supporting section 1210 and the second supporting section 1230 and Reach corresponding rollover effect.First supporting section 1210, the second supporting section 1230, changeover portion 1220 can be curve, straight line and folding Line and above two or two or more linear mixing arrangements.It is preferred that first supporting section 1210, the second supporting section 1230th, changeover portion 1220 is the curve of radius of curvature consecutive variations, and radius of curvature gradually reduces.

Point support is a relative concept, refers to strut 1200a and contacts blood vessel 2000 with relatively small contact area, It is basic it is considered that being a support with the contact of blood vessel 2000 i.e. relative to the length and diameter of strut 1200a.It crosses It is 10~40mm to filter 1200 maximum outside diameter D of part, and blood vessel maximum gauge is 2D (16~34mm sections, usual 24mm).

It is specific as shown in fig. 6, it is preferred that the second supporting section 1230 of the strut 1200a preferably include the first subsegment 1230a, Second subsegment 1230b and third subsegment 1230c；Wherein, the second supporting section 1230 is curve, and the curvature of the second subsegment 1230b is partly Diameter is less than the first subsegment 1230a, the second subsegment 1230b and the angle β of central axes is transitioned into β >=180 ° for 180 ° by 90 °≤β ＜, Form the point contact with intravascular wall surface；Or second subsegment 1230b be curve or broken line, formed opening towards central axes C Font or V-shaped form point contact, the first subsegment 1230a and third subsegment 1230c as straight line or broken line with intravascular wall surface, And the whole direction towards at the top of filter of the second supporting section 1230 is bent the radius of curvature of the second subsegment 1230b to be minimum, in this way Structure, the point or section of the second subsegment 1230b become the distalmost end of strut 1200a, i.e., the second subsegment of all strut 1200a The circumference a little or where one section on 1230b forms the largest circumference of filtration members 1200, the position of the second subsegment 1230b As the position with blood vessel point contact.

As shown in Figure 2-5, recoverer 1300 is recycled for filter, and recoverer 1300 is arranged on a filtration members 1200 Center, i.e., in the position that strut 1200a collects.Recoverer 1300 is arranged in the present embodiment and includes hook or link, Enter delivery conduit for recycling filter.

According to clinical preoperative evaluation, suitable vena cava filter implantation path is selected.As shown in figure 4, for vena cava filter After jugular vein conveys, the structure diagram of implanting state, the cage type space that filtration members 1200 are surrounded at this time is mainly used for catching Thrombus 3000 is obtained, filtration members 1200 are bending shape, farthest avoid strut 1200a adherent, reduce endothelium and climb and cover, filter With preferably from center performance, preventing filter from tilting or recycling hooks adherent, filter recycling is more advantageous to, when needing to recycle filter During device, it can be hooked from the recycling of the recovered conduit of jugular puncture and catching device capture recoverer 1300, entire filter is recycled To sheath, and take out external.Compared to cage type filter, there can be wider application range through jugular vein controlled release.

As shown in figure 5, the vena cava filter for multiple filtration is after femoral vein conveys, the structure diagram of implanting state, The cone space that filtration members 1200 are surrounded at this time is for capturing thrombus 3000, and filtration members 1200 are supported with vascular wall point, filter With preferably from center performance, preventing filter from tilting or recycling hooks adherent, it is more advantageous to filter recycling.Filtration members 1200 are Bending shape, the strut 1200a avoided to the greatest extent is adherent, reduces endothelium and climbs and covers.It, can be from neck when needing to recycle filter Stock arteries and veins punctures recovered conduit and catching device capture recycling hooks, and entire filter is recycled to sheath, and take out external.Compared to existing Strut type filter can have wider application range through femoral vein controlled release.

Connecting rod 1100 with the connection mode of filtration members 1200 can be it is as shown in Figure 2 be fixedly connected, can also as figure 7th, the integral structure shown in 8, the connecting rod 1100 are structure as a whole at least one filtration members 1200, connecting rod 1100 by Filtration members 1200 are central axial extends to form for this.The strut 1200a of one in two filtration members 1200 is since center to another One filtration members 1200 extends, and strut 1200a bunchys arranged side by side form connecting rod 1100.This structure increases dual layer filter pack Flexibility between 1200.

As shown in Figure 7,8, in order to preferably filter, then the strut 1200a of two adjacent filtration members 1200 in axial direction It is upper staggered.The strut 1200a of i.e. one filtration members 1200 be presented axially in 1200 strut 1200a of another filtration members it Between gap in, reduce the possibility that leaks through of thrombus.One filtration members 1200 of Fig. 7 middle and upper parts set 12 strut 1200a, under Another filtration members 1200 of portion set 6 strut 1200a, the strut 1200a of different layers to be staggered, as shown in figure 8, top One filtration members 1200 sets 6 strut 1200a, another filtration members 1200 of lower part set 12 strut 1200a, different layers Strut 1200a be staggered.

As shown in figure 9, the strut 1200a of same filtration members 1200 is staggered in the axial direction, bilayer or multilayer is formed Structure.Such structure also accordingly increases filter effect.Filtration members 1200 are not only staggered in the same plane, also in axial mistake It opens, reduces the radial support power of same layer strut 1200a, while instrument is made more to stablize, it is not easy to tilt.

Figure 18-20 discharges process schematic for a filtration members.It is the second supporting section of strut 1200a as shown in figure 18 1230 are unfolded situation from conduit 1600, are strut 1200a expansion half as shown in figure 19, and changeover portion 1220 is gradually unfolded, with The expansion of strut 1200a, the third supporting sections 1230 of strut 1200a ends starts to filter top curved, as shown in figure 19 State be release during most precarious position, strut 1200a ends are towards blood vessel wall surface 1800, if strut 1200a mistakes Long or strut 1200a curvature is insufficient, strut 1200a ends can all be caused to puncture blood vessel, it is therefore desirable to the strut 1200a Shape under free state meets：D2<The half and D1 of vessel diameter<The half of vessel diameter；Wherein, D1：With strut The tangent line of 1200a ends is the second boundary line, between the farthest point in strut 1200a opposing second edges boundary line and the second boundary line Distance；D2：Using by strut 1200a ends and the straight line vertical with the second boundary line is third boundary line, strut 1200a phases For the distance in the outside farthest point of third boundary line.According to above-mentioned requirements, then strut 1200a is during release is unfolded, branch Bar 1200a ends will not pierce intravascular wall surface 1800.Delivery conduit 1600 as shown in figure 20 of dropping back again, filtration members 1200 First supporting section 1210 is unfolded, then strut 1200a ends were just bent before 1800 wall surface of blood vessel is pasted towards central axes, will not be pierced 1800 internal face of blood-breaking pipe.The second subsegment 1230b in the second supporting section 1230 of strut 1200a is adherent, supports to blood vessel On 1800 inner walls.Due to the utility model filtration members 1200, the outside overturning first reversely curling during release, will not be pierced into Onto blood vessel, each filtration members 1200 can be opened slowly, avoid emitting filter in the prior art, the spring of filter strut and The problem of being impacted to vascular wall.

Embodiment 2, as shown in Figure 10, on the basis of embodiment 1, the filter further includes to be used to support the present embodiment Support element 1400 on blood vessel, the support element 1400 are gradually prolonged from connecting rod 1100 to axial direction outside It stretches, the end of support element 1400 is turned down with axis parallel or to central axes direction.Support element 1400 is surrounded by auxiliary support bar Central axes axial symmetry distribution, auxiliary support bar are preferably provided with quantity in 3-6 roots.Other structures are no longer superfluous herein with embodiment 1 It states.

Embodiment 3, as shown in figs. 11 and 15, the present embodiment is on the basis of embodiment 1, and connecting rod 1100 is can be bent And position, vascular bending situation is complied with, there are many specific embodiments that connecting rod 1100 is bent：

As shown in figure 13, the first embodiment of connecting rod 1100：The connecting rod 1100 is with support force and has There is the flexible jointing-rod 1105 of compliance；Flexible jointing-rod 1105 can select be bent and the material with certain support force It is made.Compliance refers to can move towards bending along blood vessel.

As shown in figure 14, second of embodiment of connecting rod 1100：The connecting rod 1100 includes the first connection unit 1101 and second connection unit 1102, pass through universal joint between 1101 and second connection unit 1102 of the first connection unit 1103 connect and support positioning；Universal joint 1103 can be bent in radial direction any direction, axial bending to a certain extent after, it is universal Section 1103 after 1102 top pressure of the first connection unit 1101 or the second connection unit with positioning.The concrete structure of universal joint 1103 is normal Rule technology, details are not described herein.

As shown in figure 15, the third embodiment of connecting rod 1100：The connecting rod 1100 includes the first connection unit 1101st, the second connection unit 1102 and transition piece 1106,1101 and second connection unit 1102 of the first connection unit It is hinged with transition piece 1106 respectively, and the first connection unit 1101 and the second connection unit 1102 are mutual at two respectively Vertical direction upper limit rotates and supports positioning.Rotation-limited is exactly that slewing area is limited in the axial direction, and radial rotating is not It limits.

As shown in Figure 11,12, filtration members 1200 are equipped with the anchor thorn 1500 being anchored on wall in the blood vessels, the anchor thorn Angle between 1500 and the central axes of filtration members 1200 is 90 ° ± 10 °.Particularly on strut 1200a be equipped with for The anchor thorn 1500 being anchored on blood vessel 2000, anchor thorn 1500 on strut 1200a is for fixing strut 1200a ends, a side It is too deep that face prevents strut 1200a ends to be pierced into blood vessel 2000.On the other hand the displacement of filter forward or backwards is prevented.Anchor No matter the angle of thorn 1500, in the position basically perpendicular to central axes, returns at 90 ° ± 10 ° through femoral vein or jugular vein in this way 1500 can be pierced by anchor by, which receiving, extracts, can be from the recovered conduit of neck femoral venous puncture and catching device when needing to recycle filter Capture recycling hooks, and entire filter is recycled to sheath, and take out external.It, cannot be through stock after implantation compared to existing strut type filter Recycling has wider application range.Remaining structure is with embodiment 1, and details are not described herein.

Embodiment 4, as shown in Figure 16,17, the present embodiment increases cross-linked structure on the basis of embodiment 1.Filter The strut 1200a of part 1200 is cross-linked with each other, and crosslinking node is formed at crosslinking, the crosslinking node positioned at 1200 center of filtration members Centered on be crosslinked node 1202, outermost crosslinking node is crosslinked node 1201 for end, end crosslinking node 1201 it Between maximum spacing be no more than blood vessel diameter.Outermost crosslinking node, that is, end crosslinking node 1402 is less than blood vessel diameter, makes It obtains filtration members 1200 not contact with blood vessel 2000, reduces blood vessel 2000 and climb and covers, be unfavorable for filter recycling.

Cross-linked structure refer to strut 1200a by fixation spaced apart or the Node connectedness to intersect in flakes or Other shapes extended around.In the present embodiment be specifically by more strut 1200a from central forward extend outwardly diameter by Step expands and angular or diamond shape the network to be formed that is cross-linked with each other, and network can be applicable in folding and unfolding in sheath with radial expansion Guan Zhong allows filtration members 1200 more preferably to intercept thrombus since thrombus is crosslinked shape in bulk, angular, diamond shape etc..

Cross-linked structure formed a kind of mode be：Filtration members 1200 be gradually outward extended with from central forward more root long degree compared with Long strut 1200a also has short strut 1200a for lateral connection between the strut 1200a of these length, formed it is angular or Diamond shape cross-linked structure, 1200 global shape of filtration members are diameter gradually widened funnel-form.The second way is：Filtration members 1200 Multiple strut 1200a be integrally formed overall structure, cross-linked structure also one-pass molding.

Filtration members 1200 can also be hollow grid sphere, grid plate-like or net that strut is cross-linked to form in addition to funnel-form Lattice platy structure.

Claims (11)

1. a kind of vena cava filter of multiple filtration, which is characterized in that include the filtration members of at least two axially spaced-aparts arrangement, phase The connecting rod for connecting filtration members is equipped between adjacent filtration members；

Each filtration members are to crimp and respectively put from center to distal exterior extension and gradually reverse flip to support In the blood vessels on wall.

2. the vena cava filter of multiple filtration according to claim 1, which is characterized in that the filtration members include at least three A strut from center to external radiation and all struts are axisymmetricly arranged；The tangent line of the strut end or strut end with Central axes angle β >=180 ° of filtration members.

3. the vena cava filter of multiple filtration according to claim 2, which is characterized in that the every strut is included successively From center to the first supporting section of external radiation, the second supporting section；

The angle α of the tangent line of each point and filtration members central axes is 0~90 ° on first supporting section or the first supporting section, second Angle β >=90 ° of the tangent line of each point and central axes on supporting section or the second supporting section, and the second supporting section end or end are cut Line and angle β >=180 ° of central axes；Angle or the first supporting section between first supporting section and the second supporting section and second Support angle γ >=180 ° of each point tangent line in section；Second supporting section point of the strut is supported on blood vessel.

4. the vena cava filter of multiple filtration according to claim 2, which is characterized in that the branch of two adjacent filtration members Bar with it is staggered in the axial direction.

5. the vena cava filter of multiple filtration according to claim 2, which is characterized in that the strut of same filtration members exists It is staggered in axial direction, forms bilayer or multilayer structure.

6. the vena cava filter of the multiple filtration according to claim 1-5 any one, which is characterized in that the connecting rod For the flexible jointing-rod with support force and with compliance；

Or the connecting rod includes the first connection unit and the second connection unit, first connection unit connect single with second It is connected between member by universal joint and supports positioning；

Or the connecting rod includes the first connection unit, the second connection unit and transition piece, first connection unit It is hinged respectively with transition piece with the second connection unit, and the first connection unit and the second connection unit are mutual at two respectively Vertical direction upper limit rotates and supports positioning.

7. the vena cava filter of the multiple filtration according to claim 1-5 any one, which is characterized in that the connecting rod It is structure as a whole at least one filtration members, connecting rod is extended to form by the filtration members are central axial.

8. the vena cava filter of multiple filtration according to claim 1, which is characterized in that the filter is further included for branch The support element on wall in the blood vessels is supportted, the support element is from connecting rod gradually to extension on the outside of an axial direction, support element End and axis parallel or turned down to central axes direction.

9. the vena cava filter of multiple filtration according to claim 1, which is characterized in that the vena cave of the multiple filtration Filter further includes recoverer, and the recoverer is connected in filtration members.

10. the vena cava filter of multiple filtration according to claim 1, which is characterized in that the filtration members, which are equipped with, to be used Angle between the anchor thorn being anchored on wall in the blood vessels, the anchor thorn and the central axes of filtration members is 90 ° ± 10 °.

11. the vena cava filter of multiple filtration according to claim 2, which is characterized in that the strut phase of the filtration members Mutually crosslinking, and crosslinking node is formed at crosslinking, outermost crosslinking node is crosslinked node for end, and the end is crosslinked node Between maximum spacing be no more than blood vessel diameter.