CN205885580U - Woven vena cave filter - Google Patents

Abstract

The utility model provides a woven vena cave filter, its characterized in that: include integrative knitted -formed and the filter house, fixed part and the connecting portion that distribute in proper order by proximal part to distal end, wherein: the filter house includes along a N1 Y type establishment structure of circumference distribution, the fixed part includes along the N1 root arris of circumference distribution, connecting portion extend for N1 root arris by the fixed part is direct and weave structure by the taper shape that forms after two ligature of steel bushing, or for the N1 root arris by the fixed part extend after through weaving and by two ligature of steel bushing after the taper shape that forms weave the structure. The utility model provides a more the large size thrombus can be tackled in the pulmonary embolism critical days to vena cave filter device, prevents the emergence of pulmonary vein embolism to keeping the long -term noncongestion of vena cave filter through the shearing force, and ging through promptly the back accessible critical days in the pulmonary embolism and insert the operation and take out it, it is internal to stay patient again for a long time.

Description

Weaving type vena cava filter

Technical field

This utility model is related to a kind of vena cava filter.

Background technology

Pulmonary infarction (pulmonary embolism, pe) is the higher acute disease of clinical onset rate, mortality rate, its morbidity Rate intentions angiopathy the 3rd, is only second to hypertension and coronary heart disease, and its mortality rate is 25～30%.According to incompletely statistics, in State has 35.5 ten thousand Pulmonary Embolism Patients at present.

Pulmonary infarction is to enter pulmonary circulation due to the thrombus breaks loose of around deep venous thrombosis or right cardiac cavity, blocking pulmonary artery or its Branch, and then the clinical pathology physiological change based on a series of obstacles with pulmonary circulatory function causing.Result of study shows, causes The embolus 75～90% of pulmonary infarction derives from the thrombosis that pelvic veins or deep veins of lower limb come off.Thrombosis after coming off are along caval vein Move on to cardiopulmonary in system, cause pulmonary embolism.

Vena cava filter (vena cava filter, vcf) is to cause lung for pushing up anti-superior and inferior vena cave system embolus and coming off Arterial thrombosiss and a kind of filtering device of designing, can be used for anticoagulant and avoid and have acute pulmonary embolism or acute near-end (above knee) The patient of venous thrombosis.

With the development of clinical technology and manufacturing technology, the performance of vena cava filter and implantation have considerable sending out Exhibition.Vena cava filter is Interventional Radiography and the usual armarium of Vascular surgeons.In operation, by puncture radicular vein or Vena cava filter is simultaneously implanted caval vein under contrastographic picture auxiliary by jugular mode.Vena cava filter is divided into permanent filter With provisional filter (also referred to as recyclable filter).The vena cava filter of early stage is all permanent, cannot after inserting in caval vein Taken out with intervening mode, because vena cava filter is also endovascular foreign body, equally have the danger of induction thrombosis, therefore placed cavity Client need long-term anticoagulant therapy after vein filter, this just brings the danger of inconvenience and bleeding to patient.Provisional filter Utility model, not only acted as prevention pulmonary infarction effect, also avoid simultaneously itself induction thrombosis risk.Under patient The acute stage of limb deep venous thrombosis, inserts provisional filter, and after acute stage, again to be situated between when the risk of thrombus breaks loose reduces Enter mode to be drawn off.

It is designed to beveled structure more the vena cava filter of early stage, intercept free thrombosis in blood vessel.However, this structure sets Meter easily tilts, shifts in vein intracavity.For preventing displacement or the drift of filter, increase in the middle of filter tinsel head end or metallic rod Plus barb structure, so that filter is fixed in blood vessel wall.However, the tinsel with agnail directly pierces blood vessel wall, to blood vessel Wall can cause certain damage, and serious puncture vein tube wall leads to bleeding, or even pierces the initiation sense of the internal organs such as small intestinal, colon Dye.

Spindle-type filter has thick waist structure in design, can play a supporting role, and is difficult.Wherein, No agnail fixed pattern can take out in vitro after the implantation as provisional filter for 2～3 weeks, and the type having agnail fixing can not only be used for facing When property filter, also can be placed in the patient as permanent filter.Although this design serves preferable fixation, so And, formed using high-temperature shaping after Nitinol pipe laser engraving because spindle-type filter is many, there is wire breakage and lead to filter Device structural collapse damages caval vein inwall, blood vessel embolism leads to the not smooth equivalent risk of blood circulation, and document is also repeatedly reported.

Content of the invention

The purpose of this utility model is to provide a kind of structure more preferably vena cava filter.

In order to achieve the above object, the technical solution of the utility model there is provided a kind of Weaving type vena cava filter, its It is characterised by: include integrated woven molding and the filter house, fixed part and the connecting portion that are sequentially distributed by proximal part to distal end, its In:

Filter house includes circumferentially distributed n₁Individual y type programming structure, n₁>=3, the root of each y type programming structure is by n₂ Root silk is worked out, n₂>=2, n₂N in root silk₃Root silk is brought out forming a bifurcated of current y type programming structure, 1≤n₃＜ n₂, remaining n₂-n₃Root silk is brought out being formed another bifurcated of current y type programming structure, the root of all y type programming structures It is in cone after being ligatured by steel bushing one；

Fixed part includes circumferentially distributed n₁Root rib, every rib includes n₂Root silk, by two neighboring y type programming structure Adjacent two furcation areas extend and merge braiding and form；

Connecting portion is by the n of fixed part₁The conical braiding structure that root rib directly extends and formed after being ligatured by steel bushing two, Or be by the n of fixed part₁The conical braiding structure that root rib is formed through braiding and after being ligatured by steel bushing two after extending.

Preferably, described connecting portion includes circumferentially distributed n₁Root i type braiding structure, every i type braiding structure is by one The rib of fixed part described in root extends and is formed, and the end of all i type braiding structures forms cone after being ligatured by described steel bushing two.

Preferably, described n₁=2 × n, n are the positive integer not less than 1；Described connecting portion includes the n of integrated woven molding Individual circumferentially distributed t type braiding structure, each t type braiding structure is formed by adjacent two ribs braiding of fixed part, all t types The end of the vertical portion of braiding structure forms cone after being ligatured by described steel bushing two.

Preferably, described n₁=2 × n, n are the positive integer not less than 3；Described connecting portion includes the n of integrated woven molding Individual circumferentially distributed t type braiding structure and a n type braiding structure, are connected with one between two neighboring t type braiding structure One type braiding structure, if two ribs of the described fixed part adjacent with i-th t type braiding structure are respectively i-th rib and i+1 Root rib, the i-th -1 rib is respectively the two piece ribs adjacent with i-th rib with i+1 root rib, and i-th rib is respectively with the i-th+2 ribs The two piece ribs adjacent with i+1 root rib, then by the n4 root silk in the i-th -1 rib, the n5 root silk in i-th rib, i+1 root rib N6 root silk, the n7 root silk in the i-th+2 ribs is coextensive is knitted to form i-th t type braiding structure；By in the i-th -1 rib N2-n5 root silk in n4 root silk and the i-th rib is coextensive to be knitted to form the type being connected with i-th t type braiding structure and compiles Knit structure；It is knitted to form and i-th t by the n7 root silk in the n2-n6 root silk and the i-th+2 ribs in i+1 root rib is coextensive Another type braiding structure that type braiding structure connects.

Preferably, described silk is tinsel, comprises but is not limited only to niti B alloy wire, titanium alloy wire, Mg alloy wire, stainless Steel wire etc..

Preferably, described silk is nonmetal wire, comprises but is not limited only to non-degradable macromolecular fibre silk, biodegradable Macromolecular fibre silk, for example: polylactic acid (pla), PVOH acid esters (pga), polycaprolactone (pcl), polyhydroxyalkanoate (phb) etc..

The vena cava filter device that this utility model provides, can intercept the thrombosis of large-size, in advance in the risk for pulmonary embolism phase The generation of anti-pulmonary vein thromboembolism, and the unimpeded for a long time of vena cava filter is kept by shearing force, and tide in the risk for pulmonary embolism phase Can be drawn off by accessing operation after i.e., in patient body can be stayed for a long time, it has the advantage that again

1st, will have the niti B alloy wire of shape memory function, by establishment method, thermally treated be shaped into spindle-type, As vena cava filter；

2nd, niti B alloy wire has good shape memory function and high resiliency, repeats release, discharges aftershaping effect Good；

3rd, this vena cava filter is formed by the braiding of niti B alloy wire, and niti silk elasticity is high, and compliance is good, with caval vein inwall Laminating is tight, fixation；

4th, can be used as provisional filter to perform the operation after the risk for pulmonary embolism phase taking-up, also can be long-term as permanent filter Stay in human body；

5th, no agnail design, reduces the damage to caval vein blood vessel；

6th, according to actual needs, this vena cava filter standing part may be designed to different lengths, for using this selection；

7th, this Weaving type vena cava filter uses the thinner niti B alloy wire of string diameter, and single niti silk stress is little, and fatigue is damaged Wound is little, inserts retrocaval and is not susceptible to fracture of wire phenomenon；Even if rupturing, because string diameter is soft, also will not be in caval vein Wall causes too macrolesion；

8th, this vena cava filter is formed by many niti silk braidings, even if there is single niti fracture, nor affects on whole The overall structure of vena cava filter and shape, can maintain stable shape for a long time；

9th, due to there is natural ledge structure between niti and ligation steel bushing, therefore, upper and lower steel bushing all can be when reclaiming Captured by catching device, take in sheath and take out in vitro；

10th, it is not necessary to extra equipment and technique, cost is relatively low for niti alloy thread weaving method technology maturation.

Brief description

A kind of structural representation of Weaving type vena cava filter that Fig. 1 provides for this utility model；

Fig. 2 a) for distal end be i type, proximal part be y type Weaving type vena cava filter a direction schematic diagram；

Fig. 2 b) for distal end be i type, proximal part be y type Weaving type vena cava filter another direction schematic diagram；

Fig. 2 c) for filter house schematic diagram；

Fig. 2 d) for i type connecting portion schematic diagram；

Fig. 3 a) it is a kind of schematic diagram of the filter house of version；

Fig. 3 b) be Fig. 3 a) corresponding to connecting portion schematic diagram；

Fig. 4 a) be another kind of version filter house schematic diagram；

Fig. 4 b) be Fig. 4 a) corresponding to connecting portion schematic diagram；

Fig. 5 a) be another kind of version filter house schematic diagram；

Fig. 5 b) be 5a) corresponding to connecting portion schematic diagram；

Fig. 6 a) for distal end be t type, proximal part be y type Weaving type vena cava filter a direction schematic diagram；

Fig. 6 b) for distal end be t type, proximal part be y type Weaving type vena cava filter another direction schematic diagram；

Fig. 6 c) for filter house schematic diagram；

Fig. 6 d) for connecting portion schematic diagram；

Fig. 7 a) for filter house a kind of version schematic diagram；

Fig. 7 b) be Fig. 7 a) corresponding to connecting portion schematic diagram；

Fig. 8 a) add a type for distal end for t type, proximal part be y type Weaving type vena cava filter the showing an of direction It is intended to；

Fig. 8 b) add a type for distal end for t type, proximal part be y type Weaving type vena cava filter another direction Schematic diagram；

Fig. 8 c) for filter house schematic diagram；

Fig. 8 d) for connecting portion schematic diagram；

Fig. 9 a) for filter house a kind of version schematic diagram；

Fig. 9 b) be Fig. 9 a) corresponding to connecting portion schematic diagram；

Figure 10 be Fig. 9 b) connecting portion braiding schematic diagram.

Specific embodiment

For making this utility model become apparent, hereby with preferred embodiment, and accompanying drawing is coordinated to be described in detail below.

The utility model discloses a kind of recoverable version vena cava filter.This utility model is with nitinol alloy wire for main material Matter, by the retrievable vena cava filter of the method preparation of braiding.This filter is by the filter house of middle fixed part b and both sides C (positioned at proximal part) and connecting portion a (positioned at distal end) composition, both sides termination sets ligation steel bushing, and filter house c and connecting portion a are equal In cone, fixed part b is a plurality of braided wires being parallel to each other, the fixing point of filter house c and connecting portion a coaxial it is ensured that with one heart Positioning, as shown in Figure 1.The filter that this utility model provides is to have the supporting structure that memory alloy wire is compiled into spindle-type, Compared with the traditional rustless steel or nickel-titanium alloy material vena cava filter using cutting and solder technology preparation, this utility model is more Simply, easy to operate, material structure is stable, and mechanics elasticity is excellent., it is not necessary to extra equipment and technique, cost is relatively for technology maturation Low.

Ligation steel bushing positioned at distal end is designed with female thread, can be connected with conveyer device.The steel bushing at filter two ends Form step and nitinol alloy wire between, catching device can directly be fished for and is drawn off in vitro.Remember work(using having ultra-strong elasticity After the niti B alloy wire of energy is woven, under compression, in tight bundle-shaped, it is in bipyramid veil in the released state.

The vena cava filter that this utility model provides is characterised by, distal end is Conical Lattice, and Conical Lattice is by many nickel Titanium alloy wire is woven into y type braiding structure etc. point rotation and constitutes.Middle fixed part is parallel braided metal silk, in circumferencial direction Decile, forms concentric cylinder beam；Proximal part is Conical Lattice, and Conical Lattice is woven into multiple i type braidings by one group of nitinol alloy wire Structure etc. point rotation is constituted, and the nitinol alloy wire of each i type braiding structure collects in root and is fixed together through steel bushing ligation.

Sub-thread nitinol alloy wire positioned at the root of the y type braiding structure of proximal part can be n root, n=2,3,4, 5…….

Embodiment one

As Fig. 2 a) to Fig. 2 d) and Fig. 3 a) to Fig. 3 b) shown in, proximal part Conical Lattice by ligaturing steel bushing, 12 niti B alloy wire is woven together two-by-two and forms 6 y type braiding structures, and 6 y type braiding structures are uniformly distributed in the circumferential.Each y type The root of braiding structure is 2 niti silks, and Liang Ge branch is respectively 1 niti silk.Adjacent the two of two neighboring y type braiding structure Root niti silk merges follow-up sequeling and is woven to middle fixed part, and now, 6 braided metal silks of fixed part are respectively by 2 niti silk groups Become.6 braided metal silks extend to distal end, form distal end Conical Lattice, and every braided metal silk continues to be woven into an i type Braiding structure, decile rotation is tapered and pools together, and is finally ligatured by steel bushing and fixes.

Embodiment two

4a as shown in the figure) and Fig. 4 b) shown in, proximal part Conical Lattice from the beginning of ligation steel bushing, every 3 of 18 niti B alloy wires Be woven together 6 y type braiding structures of formation, and 6 y type braiding structures are uniformly distributed in the circumferential.Each y type braiding structure Root is 3 niti silks, and Liang Ge branch is respectively 2 niti silks and 1 niti silk.Two neighboring y type braiding structure adjacent Liang Ge branch merges follow-up sequeling and is woven to middle fixed part, and now, 6 braided metal silks of fixed part are respectively by 3 niti silk groups Become.6 braided metal silks extend to distal end, form distal end Conical Lattice, and every braided metal silk continues to be woven into an i type Braiding structure, decile rotation is tapered and pools together, and is finally ligatured by steel bushing and fixes.

Embodiment three

As Fig. 5 a) and Fig. 5 b) shown in, by ligaturing steel bushing, 24 niti B alloy wires weave proximal part Conical Lattice two-by-two Form 6 y type braiding structures, 6 y type braiding structures are uniformly distributed in the circumferential together.The root of each y type braiding structure For 4 niti silks, Liang Ge branch respectively 2 niti silks.The two neighboring branch of two neighboring y type braiding structure merges follow-up Sequel and be woven to middle fixed part, now, 6 braided metal silks of fixed part are respectively made up of 4 niti silks.6 braided metal silks Extend to distal end, form distal end Conical Lattice, every braided metal silk continues to be woven into an i type braiding structure, decile revolves Change into taper and pool together, finally ligatured by steel bushing and fix.

Example IV

As Fig. 6 a) to Fig. 6 d) shown in, by ligaturing steel bushing, 12 niti B alloy wires weave proximal part Conical Lattice two-by-two Form 6 y type braiding structures, 6 y type braiding structures are uniformly distributed in the circumferential together.As Fig. 7 a) shown in, each y type is compiled The root knitting structure is 2 niti silks, and Liang Ge branch is respectively 1 niti silk.Adjacent the two of two neighboring y type braiding structure Root niti silk merges follow-up sequeling and is woven to middle fixed part, and now, 6 braided metal silks of fixed part are respectively by 2 niti silk groups Become.As Fig. 7 b) shown in, after 6 braided metal silks of fixed part extend to distal end, the biphase remittance of adjacent 2 braided metal silks two Form t type braiding structure, form distal end Conical Lattice.The both sides of the horizontal part of t type braiding structure are respectively 2 niti silks, t type The vertical portion of braiding structure is 4 niti silks, and decile rotation is tapered and pools together, and is finally ligatured by steel bushing and fixes.

Embodiment five

As Fig. 8 a) to Fig. 8 d) shown in, by ligaturing steel bushing, 12 niti B alloy wires weave proximal part Conical Lattice two-by-two Form 6 y type braiding structures, 6 y type braiding structures are uniformly distributed in the circumferential together.As Fig. 9 a) shown in, each y type is compiled The root knitting structure is 2 niti silks, and Liang Ge branch is respectively 1 niti silk.Adjacent two of two neighboring y type braiding structure Niti silk merges follow-up sequeling and is woven to middle fixed part, and now, 6 braided metal silks of fixed part are respectively made up of 2 niti silks.

6 braided metal silks, to distal end, are formed by 3 circumferentially distributed t type braiding structures and by two neighboring t type The distal end Conical Lattice of the type knitting mechanism composition that braiding structure is connected.For any one t type braiding structure therein Speech, that is, for i-th t type braiding structure, if the two of the fixed part being adjacent braided metal silks are respectively i-th volume Knit tinsel and i+1 root braided metal silk, the i-th -1 braided metal silk is respectively and i-th with i+1 root braided metal silk Two adjacent braided metal silks of braided metal silk, i-th braided metal silk and the i-th+2 braided metal silks be respectively with i-th+ Two adjacent ribs of 1 braided metal silk.Then by a niti silk in the i-th -1 braided metal silk, i-th rib A niti silk in silk, i+1 root rib, a niti silk in the i-th+2 ribs are coextensive to be knitted to form i-th t type volume Knit structure；It is knitted to form and i-th by a niti silk in the i-th -1 rib and another niti silk in the i-th rib are coextensive The type braiding structure that individual t type braiding structure connects；By in another niti silk and the i-th+2 ribs in i+1 root rib A niti silk coextensive be knitted to form another type braiding structure connecting with i-th t type braiding structure, specifically may be used Referring to Figure 10.Last ligation by steel bushing is fixed.

The weaving manner of niti B alloy wire is not limited only to above-mentioned several, and it may is that

N=1, individual thread；

N=2, two silks are threaded together formation twist shape；

N=3,3 silks twist Flos Cannabiss together, or compile pigtail (as schemed)；

N=4,4 silks twist Flos Cannabiss together, or as drawing method weaves, or first 2 stubborn Flos Cannabiss together, then 2 2 are threaded together the thicker Flos Cannabiss of formation (as schemed)；

N=5, can be any combination of mode in above 4；

……

Niti silk in said structure can be substituted with the tinsel such as stainless steel silk, titanium alloy wire, other may also be employed non- Tinsel, such as degradable and non-degradable macromolecular fibre silk etc..

During use, this utility model is divided into IVCF and superior vena cava filter.

For IVCF:

Femoral vein makes breach first, will convey sheath along femoral vein blood tube passage, and reach postcava through iliac vein, will convey Sheath is put into below left and right renal veinss branch position, in vitro vena cava filter device is threaded connection set and push rod assembling After good, take in sheath, along conveying sheath, vena cava filter device is pushed to below left and right renal veinss branch position.Fixing push Bar, withdraws filtration fraction (the nearly heart that below conveying sheath left and right Deep venou in postcava position discharges vena cava filter device End), continue to withdraw conveying sheath until vena cava filter device goes out sheath.Treat that vena cava filter device shape in postcava is complete After recovery, screw push rod and push rod is exited.

For superior vena cava filter:

Jugular vein makes breach first, will convey sheath along jugular vein blood vessel access, and reach superior vena cava, and conveying sheath is put into In caval vein, in vitro vena cava filter device is threaded connection after set assembled with push rod, takes in sheath, along conveying Sheath pushes to vena cava filter device in superior vena cava.Fixing push rod, withdrawing conveying sheath, to discharge chamber in superior vena cava quiet The filtration fraction (proximal part) of arteries and veins filter unit, continues to withdraw conveying sheath until vena cava filter device goes out sheath.Treat that caval vein is filtered Device device after shape is recovered completely in postcava, screws push rod and exits push rod.

Claims (6)

1. a kind of Weaving type vena cava filter it is characterised in that: include integrated woven molding and by proximal part to distal end successively The filter house of distribution, fixed part and connecting portion, wherein:

Filter house includes circumferentially distributed n₁Individual y type programming structure, n₁>=3, the root of each y type programming structure is by n₂Root silk Work out, n₂>=2, n₂N in root silk₃Root silk is brought out forming a bifurcated of current y type programming structure, 1≤n₃＜ n₂, remain Remaining n₂-n₃Root silk is brought out being formed another bifurcated of current y type programming structure, and the root of all y type programming structures is by steel bushing In cone after one ligation；

Fixed part includes circumferentially distributed n₁Root rib, every rib includes n₂Root silk, by the phase on two neighboring y type programming structure Adjacent two furcation areas extend and merge braiding and form；

Connecting portion is by the n of fixed part₁The conical braiding structure that root rib directly extends and formed after being ligatured by steel bushing two, or be N by fixed part₁The conical braiding structure that root rib is formed through braiding and after being ligatured by steel bushing two after extending.

2. as claimed in claim 1 a kind of Weaving type vena cava filter it is characterised in that: described connecting portion includes circumferentially dividing The n of cloth₁Root i type braiding structure, every i type braiding structure is extended by the rib of a described fixed part and is formed, all i type braiding knots The end of structure forms cone after being ligatured by described steel bushing two.

3. as claimed in claim 1 a kind of Weaving type vena cava filter it is characterised in that: described n₁=2 × n, n are not less than 1 Positive integer；Described connecting portion includes n circumferentially distributed t type braiding structure of integrated woven molding, each t type braiding knot Structure is formed by adjacent two ribs braiding of fixed part, and the end of the vertical portion of all t type braiding structures is ligatured by described steel bushing two Form cone afterwards.

4. as claimed in claim 1 a kind of Weaving type vena cava filter it is characterised in that: described n₁=2 × n, n are not less than 3 Positive integer；Described connecting portion includes n circumferentially distributed t type braiding structure of integrated woven molding and a n type weaves Structure, is connected with a type braiding structure between two neighboring t type braiding structure, if adjacent with i-th t type braiding structure Two ribs of described fixed part are respectively i-th rib and i+1 root rib, and the i-th -1 rib is respectively and i-th with i+1 root rib Two adjacent ribs of rib, i-th rib is respectively the two piece ribs adjacent with i+1 root rib with the i-th+2 ribs, then by the i-th -1 rib In n₄N in root silk, i-th rib₅N in root silk, i+1 root rib₆N in root silk, the i-th+2 ribs₇The coextensive volume of root silk Knit i-th t type braiding structure of formation；By the n in the i-th -1 rib₄N in root silk and the i-th rib₂-n₅Root silk coextensive braiding shape Become the type braiding structure connecting with i-th t type braiding structure；By the n in i+1 root rib₂-n₆Root silk and the i-th+2 ribs In n₇Root silk is coextensive to be knitted to form another type braiding structure connecting with i-th t type braiding structure.

5. a kind of Weaving type vena cava filter as any one of Claims 1-4 it is characterised in that: described silk be gold Belong to silk.

6. a kind of Weaving type vena cava filter as any one of Claims 1-4 it is characterised in that: described silk be non- Tinsel.