CN104434339A - Vena cava filter - Google Patents
Vena cava filter Download PDFInfo
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- CN104434339A CN104434339A CN201310442071.2A CN201310442071A CN104434339A CN 104434339 A CN104434339 A CN 104434339A CN 201310442071 A CN201310442071 A CN 201310442071A CN 104434339 A CN104434339 A CN 104434339A
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- Prior art keywords
- filter
- vena cava
- filter element
- support ring
- cava filter
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/01—Filters implantable into blood vessels
- A61F2/0105—Open ended, i.e. legs gathered only at one side
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/01—Filters implantable into blood vessels
- A61F2/0108—Both ends closed, i.e. legs gathered at both ends
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/82—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/86—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/01—Filters implantable into blood vessels
- A61F2002/016—Filters implantable into blood vessels made from wire-like elements
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2220/0075—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements sutured, ligatured or stitched, retained or tied with a rope, string, thread, wire or cable
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2250/0004—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof adjustable
- A61F2250/0006—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof adjustable for adjusting angular orientation
Landscapes
- Health & Medical Sciences (AREA)
- Cardiology (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Transplantation (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Surgical Instruments (AREA)
- Prostheses (AREA)
Abstract
The invention discloses a vena cava filter. The vena cava filter comprises a filtering part, a binding part and a combining part, wherein the filtering part is arranged in the mode that the filtering part partially abuts against the inner wall of the vena cava; the binding part is made of biodegradable materials and is arranged in the mode that the binding part is connected with the filtering part at multiple positions and binds the filtering part; the combining part is arranged in the mode that the adjacent positions of the filtering part are connected with one another. Before the binding part is degraded, the vena cava filter is bound by the binding part to be of a cutting structure suitable for cutting thrombus flowing through the vena cava, and after the binding part is completely degraded, the vena cava filter is transformed into a support structure suitable for supporting the vena cava. The vena cava filter can be transformed into the support structure from the cutting structure more accurately after a period of preset time. The vena cava filter has the advantages of a conventional vena cava filter, for example, the vena cava filter is arranged in a minimally invasive surgery, the pain of a patient is little, and the side effects are low. A secondary surgery caused by recovery of the filter is avoided, and the relevant cost and the pain of the patient are further reduced.
Description
Technical field
The present invention relates to a kind of vena cava filter, particularly, the present invention relates to the vena cava filter that a kind of local comprises degradation material.
Background technology
Pulmonary infarction (pulmonary embolism) refers to that caulked material enters pulmonary artery and branch thereof, blocks the pathology caused by tissue blood supply and clinical state.Its cause of disease is extensive, comprising: the hypercoagulability of blood, is such as caused by wound, major operation, childbirth, tumor, the situations such as contraceptive, smoking, hereditary dysfunction of blood coagulation of taking; The damage of wall of vein, is such as caused by situations such as operation, fracture, infection; The flowing of blood is slow, is such as caused by sitting, long-range flight, lying on bed for a long time, atrial fibrillation etc.
Traditional Therapeutic Method mainly comprises whole body anticoagulant therapy, and additive method also comprises local thrombolysis, surgery gets bolt.These traditional therapeutic modality risks are high, side effect large and technical difficulty is large.Permanent type vena cava filter is adopted the earliest, but the life-time service of permanent type vena cava filter may affect the regular path of caval vein blood flow, and more serious side effect served by band.Newer Therapeutic Method uses recoverable version vena cava filter.These vena cava filters can be implanted by Wicresoft, and side effect is relatively little, and patient trauma is little, perform the operation easy.But, use recoverable version vena cava filter to need second operation, bring extra misery and spending to patient, and corresponding complication.
Vena cava filter is in the market all by the metal manufacture of various unlike material substantially, and its shape is generally crown or hat column.In some experimental application, also attempt to utilize Biodegradable material to make the degradable vena cava filter in local, wherein, the top of many one metal wires is combined by the end cap be made up of degradation material, after the scheduled time, end cap is degraded, and described many one metal wires open towards blood vessel wall, thus forms intravascular stent.But, the vena cava filter of these similar designs, the end cap that many one metal wires converge likely is wound around by the blood coagulation substance in blood and caulked material for a long time, therefore, even if end cap is degraded, what tinsel also may not necessarily be imagined according to expection opens formation support like that.And the tinsel do not opened will affect the regular path of blood vessel, thus bring longer-term and serious side effect.
Summary of the invention
Therefore, the object of the present invention is to provide the degradable vena cava filter in a kind of local, it comprises: filter element, and it is configured to partly against caval vein inwall; Constraint component, it is made up of Biodegradable material, and described constraint component is configured to connect in multiple position and retrain filter element; Bonded block, it is configured to the adjacent regions of filter element to be interconnected; Wherein, before constraint component is not degraded, what described vena cava filter had a restrained part constraint is suitable for cutting the cutting configuration flowing through caval vein thrombosis, and, after described constraint component is degradable, described vena cava filter converts to and is suitable for supporting venacaval stent configuration.
According to an Alternate embodiments of the present invention, described filter element comprises many filter wire, and described constraint component comprises the conical part be made up of many cylinders of elastic hard, described many cylinders are at one end combined together and the other end is engaged regularly by one end of every root filter wire respectively, alternatively, described filter wire is 4 to 8.
According to an Alternate embodiments of the present invention, described filter element comprises multiple support rings of waveform or dentation, and described constraint component is formed as shaft-like and is positioned at the central authorities of described multiple support ring, described multiple support ring partly curves inwardly in the mode all evenly separated with radial direction vertically each other and inserts described constraint component, alternatively, described support ring is 2 to 4, and alternatively, described angle of bend is 45 to 90 degree.
According to an Alternate embodiments of the present invention, described filter element comprises multiple support rings of waveform or dentation, and described constraint component comprises multiple constraint block, at described multiple support ring with in the aduncate situation of the mode all evenly separated with radial direction vertically each other, described multiple constraint block be engaged in respectively described multiple support ring due to the formed turning that curves inwardly, to retrain the aduncate structure of described multiple support ring, alternatively, described angle of bend is 45 to 90 degree.
According to an Alternate embodiments of the present invention, described filter element and described bonded block are made up of the multiple frameworks be tangentially connected integratedly, and described constraint component comprises the conical part be made up of many cylinders of elastic hard, described many cylinders are at one end combined together and engaged regularly by the junction section of stretching out from framework two ends respectively at the other end, alternatively, described framework is 6 to 8.
Present invention also offers the degradable vena cava filter in a kind of local, it comprises: support component, and it is configured to against caval vein inwall; Filter element, it is made up of Biodegradable material, and each position is arranged in described support component in mode spaced apart from each other; Bonded block, it is configured to the adjacent regions of filter element to be interconnected; Wherein, before filter element is not degraded, described vena cava filter has the cutting configuration being suitable for being flowed through venacaval thrombosis by filter element cutting, and, after described filter element is degradable, described vena cava filter converts to and is suitable for supporting venacaval stent configuration.
According to an Alternate embodiments of the present invention, described filter element comprises many flexible filter wire, described support component comprises multiple support rings of waveform or dentation, and the radial direction that described many filter wire are parallel to described multiple support ring in the mode all evenly separated with radial direction vertically is each other arranged in described support ring, to form network structure, alternatively, described filter wire is 4 to 8.
According to an Alternate embodiments of the present invention, described multiple support ring is propped up by metal rack or precoated metal and is configured to, and it covers the inner side of the roughly cylindrical form formed by multiple support ring.
According to an Alternate embodiments of the present invention, described support component comprises the first framework and second framework of angled connection; Described filter element comprises many flexible filter wire, and described many filter wire are arranged in described support component, to form network structure in mode spaced apart from each other.
As can be seen here, the vena cava filter of the above-mentioned type has the degradable part of larger area, thus desirably after the scheduled time, stent configuration can be converted to from cutting configuration better, avoid blood coagulation substance and caulked material in blood and be wound around the failure causing conversion configurations for a long time.Therefore, the advantage of the existing current conventional vena cava filter of this filter, as Minimally Invasive Surgery is placed, patient's misery is few, and side effect is low; Meanwhile, it also avoid the second operation reclaiming filter and bring, reduce further correlative charges and patient's misery.
Other side of the present invention, object and advantage will by becoming more apparent below in conjunction with the detailed description of accompanying drawing.
Accompanying drawing explanation
More clearly will understand the present invention from the description of some embodiments below, these embodiments are provided by exemplary reference accompanying drawing, wherein:
Fig. 1 illustrates the axonometric chart of vena cava filter according to first embodiment of the invention.
Fig. 2 illustrates the axonometric chart of vena cava filter second embodiment of the invention.
Fig. 3 illustrates the axonometric chart of the vena cava filter according to the 3rd embodiment of the present invention.
Fig. 4 illustrates the axonometric chart of the vena cava filter according to the 4th embodiment of the present invention.
Fig. 5 illustrates the front sectional view of the vena cava filter according to the 4th embodiment of the present invention.
Fig. 6 illustrates the top view of the vena cava filter according to the 4th embodiment of the present invention.
Fig. 7 illustrates the axonometric chart of the vena cava filter according to the 5th embodiment of the present invention.
Fig. 8 illustrates the top view of the vena cava filter according to the 5th embodiment of the present invention.
Fig. 9 illustrates the axonometric chart of the vena cava filter according to the 6th embodiment of the present invention.
Figure 10 illustrates the axonometric chart of the vena cava filter according to the 7th embodiment of the present invention.
Figure 11 illustrates the front view of the vena cava filter according to the 7th embodiment of the present invention.
Figure 12 illustrates the top view of the vena cava filter according to the 7th embodiment of the present invention.
Figure 13 illustrates the axonometric chart of the vena cava filter according to the 8th embodiment of the present invention.
Figure 14 illustrates the top view of the vena cava filter according to the 8th embodiment of the present invention.
Figure 15 illustrates the axonometric chart of the vena cava filter according to the 9th embodiment of the present invention.
Figure 16 illustrates the top view of the vena cava filter according to the 9th embodiment of the present invention.
In different views, corresponding parts can use similar Reference numeral to represent.
Detailed description of the invention
Hereinafter, term " near-end " and " far-end " and " top " and " bottom " have the direction about blood flow, and wherein " near-end " is positioned at the upstream of " far-end ", and " top " is positioned at the downstream of " bottom ".Vena cava filter of the present invention is applicable to the IVCF being placed on postcava position, and referred to as " filter " in following description.Blood vessel hereinafter refers to postcava blood vessel.
Fig. 1 shows the axonometric chart of filter 10 according to first embodiment of the invention, as shown in the figure, described filter 10 is roughly taper, it comprises: many filter wire 12, it is partly against blood vessel, and is integrally formed with crotch 14 outwardly, after filter 10 being implanted to the ideal position in blood vessel at the near-end of described filter wire 12, described crotch 14 is contacted with blood vessel wall, makes filter be fixed on blood vessel wall; The constraint component 16 of the taper of being made up of Biodegradable material, it is made up of many cylinders of elastic hard, described many cylinders are combined together at far-end 16a, and engaged regularly by the far-end of every root filter wire 12 respectively at near-end 16b, thus described constraint component 16 is firmly engaged with each other, to realize the function of cutting thrombosis with described multiple filter wire 12; Many root knots plying 18, many filter wire 12 are interconnected by such a way, namely after constraint component 16 is degradable, the part be once engaged with each other with constraint component 16 of filter wire 12 outwards can be opened along blood flow direction, converts the stent configuration of support blood vessels to make filter 10 to from the cutting configuration of cutting thrombosis.Alternatively, the quantity of filter wire 12 is 4 to 6 (being 4 in figure).
In the embodiment shown in Fig. 1, every root knot plying 18 is formed as " V " shape, then adjacent zygomite 18 is interconnected to form saw-tooth ring at 18a place, its top, and each top 18a of saw-tooth ring is connected to every root filter wire 12 at the near-end 16b place near cylinder.After cylinder degraded, along with filter wire 12 because recovery characters outwards opens, the top 18a of described saw-tooth ring and the angle of bottom 18b all change, and this contributes to filter wire 12 and outwards opens.Alternatively, each bottom 18b of saw-tooth ring has chamfered part, can against blood vessel wall, to prevent whole filter crooked.In the second similar embodiment shown in Fig. 2, every root knot plying 28 is formed as the shape of similar " petal ", and adjacent " petal " tangentially links together, and is connected to filter wire at two ends (28a, 28b) place.Alternatively, described zygomite 28 also can be formed as any other suitable shape.
Based on above embodiment of the present invention, below summarize the implantation describing filter and application process, this process is applicable to other embodiment of the present invention equally similarly.
In most cases, filter is configured to unexpanded configuration and pushes, and is loaded at least in part in propelling movement conduit.Push conduit through suitable vascular access, pushed enter postcava, until arrived the ideal position in postcava by the filter that draws in.Then, delivery conduit exits and filter is exposed in blood vessel completely.Due to the recovery characters of filter, cutting configuration when filter converts use to from unexpanded configuration in the blood vessel.Meanwhile, inferior caval inwall applies radially outer power whole filter to be supported on the ideal position in postcava.
After the predetermined design time, optional 14 to 90 days, degradable constraint component was degraded gradually, and filter can be converted to stent configuration from cutting configuration.Under cutting configuration, filter is configured to cut through the thrombosis of postcava towards heart and lung movement, and filter may be used for preventing pulmonary infarction thus.Under stent configuration, filter is configured to intravascular stent, keeps the normal free-flow of blood.
Fig. 3 shows the axonometric chart of the filter 30 according to the 3rd embodiment of the present invention, and as shown in the figure, described filter 30 is still roughly taper, and it comprises: many filter wire 32, and alternatively, the quantity of filter wire 32 is 4 to 8 (being 8 in figure); The constraint component 34 of taper, it is made up of many cylinders of the elastic hard be made up of Biodegradable material, the far-end 34a of cylinder is combined into one, and the near-end 34b of every root cylinder is engaged regularly by the far-end of every root filter wire respectively, thus described constraint component 34 is firmly engaged with each other, to realize the function of cutting thrombosis with described multiple filter wire 32; Bonded block 36, described bonded block 36 is the support rings be made up of waveform or dentation wire rod, and the selectable number of waveform or dentation 36 is 4 to 8 (being 8 in figure), and described bonded block 36a is connected to the near-end of filter wire 32 at each trough place.Arrive the ideal position in blood vessel at filter 30 after, described bonded block 36 is circumferentially against blood vessel wall, so that whole filter 30 is fixedly fastened in blood vessel, after constraint component 36 is degradable, the part be once engaged with each other with constraint component 34 of many filter wire 32 outwards can be opened along blood flow direction, converts stent configuration to make filter 30 to from cutting configuration.Alternatively, be integrally formed with crotch outwardly at the near-end of all or part of described 36a, make filter be fixed on blood vessel wall further.
Fig. 4 shows the axonometric chart of the filter 40 according to the 4th embodiment of the present invention, and Fig. 5 is the front sectional view cutting half filter 40 vertically, more clearly to show the details of the filter 40 according to the 4th embodiment of the present invention.As shown in Figures 4 and 5, described filter 40 is roughly tubular, it comprises: filter element 42, described filter element 42 is the multiple support rings be made up of waveform or dentation wire rod, described wire rod comprises crest portion 42a and trough portion 42b, and the selectable number of waveform or dentation is 6 to 8 (being 8 in figure), and the selectable number of support ring is 2 to 4 (being 4 in figure), alternatively, the mode that adjacent support ring aligns vertically with waveform each other is coaxially arranged; Many root knots plying 44, adjacent support ring is interconnected by it, and alternatively, the crest portion 42a of adjacent support ring is interconnected by the mode of zygomite 44 crest portion 42a, an axially spaced-apart trough portion 42b at intervals in the circumferential direction; The constraining rod 46 be made up of Biodegradable material, it is positioned at the central authorities of multiple support ring, the crest portion 42a of johning knot plying 44 that do not have of support ring can curve inwardly in such a way and insert described constraining rod 46, namely each support ring all has at least one crest portion 42a to insert constraining rod 46, and curve inwardly in the mode all evenly separated with radial direction vertically each other, as shown in Figure 6, to realize the function of cutting thrombosis.Arrive the ideal position in blood vessel at filter 40 after, the part not inserting constraining rod 46 of described filter element 42 is circumferentially against blood vessel wall, so that whole filter 40 is fixedly fastened in blood vessel, after constraining rod 46 is degradable, the part once inserting constraining rod 46 of filter element 42 outwards can be opened along blood flow direction, converts stent configuration to make filter 40 to from cutting configuration.Alternatively, insert the crest portion 42a of constraining rod 46 to curve inwardly 45 to 90 degree.Alternatively, at guarantee filter normal function and when can realize minimum contraction state, the shape of described support ring and filter element and arrangement can change.
Fig. 7 shows the axonometric chart of the filter 50 according to the 5th embodiment of the present invention, as shown in the figure, described filter 50 is still roughly tubular, its structure is similar to the structure of the 4th embodiment filter 50 according to Fig. 5 substantially, comprise: filter element 52, described filter element 52 is the multiple support rings be made up of waveform or dentation wire rod, described wire rod comprises crest portion 52a and trough portion 52b, the selectable number of waveform or dentation is 6 to 8 (being 6 in figure), the selectable number of support ring is 2 to 4 (being 3 in figure), alternatively, the mode that adjacent support ring aligns vertically with waveform each other is coaxially arranged, many root knots plying 54, adjacent filter element 52 is interconnected by it, and alternatively, the crest portion 52a of adjacent support ring is interconnected by the mode of zygomite 54 crest portion 52a, an axially spaced-apart trough portion 52b at intervals in the circumferential direction, the multiple constraint blocks 56 be made up of Biodegradable material, can in aduncate situation at the crest portion 52a of johning knot plying 54 that do not have of support ring, described multiple constraint block 56 is engaged in crest portion 52a respectively due to the formed turning that curves inwardly, to retrain the structure of aduncate crest portion 52a.Each support ring all has at least one crest portion 52a and constraint block 56 to combine, and curves inwardly in the mode all evenly separated with radial direction vertically each other, as shown in Figure 8, to realize the function of cutting thrombosis.Arrive the ideal position in blood vessel at filter 50 after, described filter element 52 there is no restrained piece 56 part retrained circumferentially against blood vessel wall, so that whole filter 50 is fixedly fastened in blood vessel, after constraint block 56 is degradable, the part of once restrained piece 56 constraint of filter element 52 outwards can be opened along blood flow direction, converts stent configuration to make filter 50 to from cutting configuration.Alternatively, crest portion 52a curve inwardly 45 to 90 degree.Alternatively, at guarantee filter normal function and when can realize minimum contraction state, the shape of described support ring and filter element and arrangement can change.
Alternatively, according in the filter of the of the present invention 4th and the 5th embodiment, crotch outwardly also can be set integratedly or individually on filter element, to be contacted with blood vessel wall, make filter be fixed on blood vessel wall, thus prevent filter to be shifted at Ink vessel transfusing.
Fig. 9 shows the axonometric chart of the filter 60 according to the 6th embodiment of the present invention, as shown in the figure, described filter 60 is roughly cylinder mould shape, it comprises: filter bonded block 62, described filtration bonded block 62 is made up of similar hexagonal multiple framework 62a, adjacent framework 62a tangentially connects in central side edge, and to form support ring, each framework 62a is also respectively arranged with the junction section 62b stretched out at two ends; Two constraint component 64 be made up of Biodegradable material, it is made up of many cylinders of elastic hard, described many cylinders at one end 64a are combined together and engaged regularly by each junction section 62b respectively at other end 64b, thus make two constraint component 64 firm engagement in the two ends of multiple framework 62a, to realize the function of cutting thrombosis.After two constraint component 64 are degradable, the part being once engaged in constraint component 64 of filtering bonded block 62 outwards can be opened along blood flow direction, converts stent configuration to make filter 60 to from cutting configuration.Alternatively, multiple framework 62a is also provided with crotch 66 outwardly, after by the ideal position in filter 60 implantable intravascular, described crotch 66 is contacted with blood vessel wall, and is sticked together with blood vessel endothelium subsequently.Alternatively, described framework 62a also can be any other suitable shape.
Figure 10 and 11 shows axonometric chart according to the filter 70 of the 7th embodiment of the present invention and front view, as shown in the figure, described filter 70 is roughly tubular, it comprises: support component 72, described support component 72 is the multiple support rings be made up of waveform or dentation wire rod, described wire rod comprises crest portion 72a and trough portion 72b, the selectable number of waveform or dentation is 6 to 8 (being 8 in figure), the selectable number of support ring is 2 to 4 (being 2 in figure), wherein, adjacent support ring corresponds to the trough portion 72b of another one support ring mode with the crest portion 72a of one of them support ring is coaxially arranged, alternatively, the mode that adjacent support ring also in axial direction can align with waveform each other mutually is coaxially arranged, many root knots plying 74, adjacent support ring is interconnected by it, and alternatively, the corresponding trough portion 72b of support ring adjacent with another for the crest portion 72a of one of them support ring is interconnected by zygomite 74, overlay film 76, it is covered in support component 72, and alternatively, described overlay film covers the inner side of the roughly cylindrical form formed by multiple support ring, the many filter wire 78 of the flexibility be made up of Biodegradable material, the radial direction that described many filter wire 78 are parallel to described multiple support ring in the mode all evenly separated with radial direction vertically is each other arranged in described support ring, and arrange in such a way, namely (as Figure 12) is observed from top view, many filter wire 78 form network structure, to realize the function of cutting thrombosis.Arrive the ideal position in blood vessel at filter 70 after, with the support component 72 of overlay film 76 circumferentially against blood vessel wall, to be fixedly fastened in blood vessel by whole filter 70, after many filter wire 78 are degradable, support component 72 stops in the blood vessel as support.Alternatively, the quantity of described filter wire 78 is 4 to 8, and filter wire 78 is tied a knot on support component 72 at its two ends.Owing to being coated with overlay film 76 in the middle part of support component 72, so filter wire 78 can not be shifted mutually and be wound around on support component 72, affect filtering function.Alternatively, in some cases, overlay film can be exempted.Alternatively, at guarantee filter normal function and when can realize minimum contraction state, the shape of described support ring and filter element and arrangement can change.
Figure 13 shows the axonometric chart of the filter 80 according to the 8th embodiment of the present invention, as shown in the figure, described filter 80 comprises: support component (82,84), described support component (82,84) be made up of the first framework 82 of similar ellipse and the second framework 84, wherein the far-end 82b of the first framework 82 is angularly connected to the near-end 84a of the second framework 84; The many filter wire 86 of the flexibility be made up of Biodegradable material, described many filter wire (86,88) comprise many first filter wire (86) and many second filter wire (88), and the two is arranged in the first framework 82 and the second framework 84 respectively.Arrive the ideal position in blood vessel at filter 80 after, support component 82 is circumferentially against blood vessel wall, and to be fixedly fastened in blood vessel by whole filter 80, after many filter wire 86 are degradable, support component (82,84) stops in the blood vessel as support.Alternatively, the periphery of support component (82,84) is also provided with crotch 89 outwardly, and described crotch 89 is contacted with blood vessel wall, makes filter better be fixed on blood vessel wall.Alternatively, described support component (82,84) also can be any other suitable shape.
In the embodiment shown in Figure 13, many first filter wire 86 in first framework 82 are arranged apart abreast, many second filter wire 88 in second framework 84 are arranged apart perpendicular to the first filter wire 86 ground, to make to observe (as Figure 14) from top view, many first filter wire 86 form network structure together with Duo Gen second filter wire 88, to realize the function of cutting thrombosis.In the filter 90 according to the 9th embodiment of the present invention shown in Figure 15, to be end points scattering with the far-end 92b of the first framework 92 arrange many first filter wire 96 in first framework 92, to be end points scattering with the far-end 94b of the second framework 94 arrange many second filter wire 98 in second framework 94, to make to observe (as Figure 16) from top view, many first filter wire 96 form network structure together with Duo Gen second filter wire 98, to realize the function of cutting thrombosis.Alternatively, many first filter wire 94 in the first framework 92 with the first framework in 92 to be end points scattering arrange in one end, many second filter wire 96 in second framework 94 can with the second framework 96 with described one end of described first framework 92 farthest away to be end points scattering arrange, to form network structure in one end.Alternatively, many filter wire (86,88) comprise many first filter wire (86) and many second filter wire (88), also can arrange with other segregation form.
Alternatively, in above all embodiments, outside the parts be made up of degradation material, other parts all can be made up of identical or different medical metal material, such as by rustless steel, Nitinol or the material such as nichrome, evanohm are made.
Above multiple embodiment of the present invention is described, but the embodiment that the present invention describes above being not intended to be limited to and accompanying drawing is illustrated.The feature described about an embodiment is equally applicable to other embodiment of the present invention, and the feature of different embodiment can be combined with each other and form new embodiment.When not departing from the essence and scope that are limited by claim below, those skilled in the art can carry out various amendment and variation to above-mentioned embodiment.
Claims (9)
1. the degradable vena cava filter in local, comprising:
Filter element, it is configured to partly against caval vein inwall;
Constraint component, it is made up of Biodegradable material, and described constraint component is configured to connect in multiple position and retrain filter element;
Bonded block, it is configured to the adjacent regions of filter element to be interconnected;
Wherein, before constraint component is not degraded, what described vena cava filter had a restrained part constraint is suitable for cutting the cutting configuration flowing through caval vein thrombosis, and, after described constraint component is degradable, described vena cava filter converts to and is suitable for supporting venacaval stent configuration.
2. vena cava filter according to claim 1, it is characterized in that, described filter element comprises many filter wire, and described constraint component comprises the conical part be made up of many cylinders of elastic hard, described many cylinders are at one end combined together and the other end is engaged regularly by one end of every root filter wire respectively, alternatively, described filter wire is 4 to 8.
3. vena cava filter according to claim 1, it is characterized in that, described filter element comprises multiple support rings of waveform or dentation, and described constraint component is formed as shaft-like and is positioned at the central authorities of described multiple support ring, described multiple support ring partly curves inwardly in the mode all evenly separated with radial direction vertically each other and inserts described constraint component, and alternatively, described support ring is 2 to 4, alternatively, described angle of bend is 45 to 90 degree.
4. vena cava filter according to claim 1, it is characterized in that, described filter element comprises multiple support rings of waveform or dentation, and described constraint component comprises multiple constraint block, at described multiple support ring with in the aduncate situation of the mode all evenly separated with radial direction vertically each other, described multiple constraint block be engaged in respectively described multiple support ring due to the formed turning that curves inwardly, to retrain the aduncate structure of described multiple support ring, alternatively, described angle of bend is 45 to 90 degree.
5. vena cava filter according to claim 1, it is characterized in that, described filter element and described bonded block are made up of the multiple frameworks be tangentially connected integratedly, and described constraint component comprises the conical part be made up of many cylinders of elastic hard, described many cylinders are at one end combined together and engaged regularly by the junction section of stretching out from framework two ends respectively at the other end, alternatively, described framework is 6 to 8.
6. the degradable vena cava filter in local, comprising:
Support component, it is configured to against caval vein inwall;
Filter element, it is made up of Biodegradable material, and each position is arranged in described support component in mode spaced apart from each other;
Bonded block, it is configured to the adjacent regions of filter element to be interconnected;
Wherein, before filter element is not degraded, described vena cava filter has the cutting configuration being suitable for being flowed through venacaval thrombosis by filter element cutting, and, after described filter element is degradable, described vena cava filter converts to and is suitable for supporting venacaval stent configuration.
7. vena cava filter according to claim 6, it is characterized in that, described filter element comprises many flexible filter wire, described support component comprises multiple support rings of waveform or dentation, and the radial direction that described many filter wire are parallel to described multiple support ring in the mode all evenly separated with radial direction vertically is each other arranged in described support ring, to form network structure, alternatively, described filter wire is 4 to 8.
8. vena cava filter according to claim 7, is characterized in that, described multiple support ring is propped up by metal rack or precoated metal and is configured to, and it covers the inner side of the roughly cylindrical form formed by multiple support ring.
9. vena cava filter according to claim 6, is characterized in that, described support component comprises the first framework and second framework of angled connection; Described filter element comprises many flexible filter wire, and described many filter wire are arranged in described support component, to form network structure in mode spaced apart from each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310442071.2A CN104434339A (en) | 2013-09-25 | 2013-09-25 | Vena cava filter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310442071.2A CN104434339A (en) | 2013-09-25 | 2013-09-25 | Vena cava filter |
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| CN104434339A true CN104434339A (en) | 2015-03-25 |
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| CN201310442071.2A Pending CN104434339A (en) | 2013-09-25 | 2013-09-25 | Vena cava filter |
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Application publication date: 20150325 |