CN204709071U - Filter - Google Patents

Abstract

Filter of the present utility model, the multiple supporters comprising first end and give off in the same way from described first end, it is characterized in that, each described supporter is coated with wing thin-film body at least partially, the width of described thin-film body is greater than the width of the part that described supporter is wrapped by, and is spaced from each other between described thin-film body on adjacent two supporters.The width of the filter that this utility model provides is greater than the width being wrapped by supporter part, when filter can be made to be placed in tube chamber, under the washing away of blood flow, thin-film body can float, reduce climbing of endothelium to cover, this thin-film body can also prevent the tissue being positioned at supporter both sides to be combined with each other and supporter is coated, thus filter is conveniently removed.

Description

Filter

Technical field

This utility model relates to a kind of medical apparatus and instruments, particularly relates to a kind of filter.

Background technology

Pulmonary infarction (PE) is a kind of common disease, and case fatality rate is high, has statistics, and the pulmonary infarction mortality rate without treatment is 20%-30%, and annual new cases accounts for 0.2% of population.China calculates with 13.5 hundred million populations, about has 2,700,000 newly-increased patients every year.

Vena cava filter (hereinafter referred to as filter) is proved to be the incidence rate that can reduce pulmonary infarction clinically.If Permanent implantation filter, can bring following risk: filter contacts with blood vessel endothelium with blood for a long time, and protein adsorption, platelet adhesion may occur, the final thrombosis that formed causes vein blood vessel to block, or causes pulmonary infarction to occur again; Implant for a long time, have and filter distortion, inclination, displacement, fracture occur, even penetrate the danger etc. of blood vessel.Therefore, the provisional filter of recommendation clinically, inserted in the acute stage that patient's deep venous thrombosis occurs, and after acute stage, was taken out by filter when the risk of thrombus breaks loose reduces again.

Vena cava filter mainly uses metal material such as 316L rustless steel, Nitinol etc. to make.After inserting postcava certain hour, filter support bar can be climbed by endotheliocyte to some extent and be covered, wraps up, may arterial intima during taking-up, therefore, provides a kind of filter preventing from endothelium from climbing covering real in necessary.

Utility model content

The technical problems to be solved in the utility model is to provide a kind of filter, and to solve prior art filter when being implanted among blood vessel, endothelium is easily climbed and is layed onto on supporter, the defect that inconvenient filter takes out.

The technical solution adopted in the utility model comprises provides a kind of filter, the multiple supporters comprising first end and give off in the same way from described first end, it is characterized in that, each described supporter be coated with wing thin-film body at least partially, the width of described thin-film body is greater than the width of the part that described supporter is wrapped by, and the described thin-film body on adjacent two supporters is spaced from each other.

In one embodiment, each described supporter comprises the extraction section that gives off from described first end and is connected and the radial support section extended vertically with described extraction section; The coated described radial support section of described thin-film body.

Each described extraction section comprises lead segment and two the first son fields; Described lead segment one end is connected with first end, the other end is connected with described first son field respectively, these two the first son fields form angle, and coordinate with described lead segment and form Y-shaped structure, cross near self one in two the first son fields that first son field described in every root is corresponding with adjacent described lead segment, axially extend to form described radial support section.

Described filter also comprises the second end, multiple second son field and multiple convergence section, each described radial support section away from described first end one end respectively second son field described be connected, two adjacent the second son fields cross and extend to form described convergence section, and many described convergence section converge at described the second end.

The radical of described first son field is more than the second son field.

In one embodiment, described thin-film body also extend from described radial support section to nearly heart direction and/or heart direction far away 5 ?8mm.

In one embodiment, described thin-film body is climbed the material covering function make by being had T suppression cell.

In one embodiment, each described thin-film body is extended to the both sides of described supporter or side by described supporter.

In one embodiment, each described thin-film body by described supporter to extend to described supporter both sides or side amplitude be 2 ?7mm.

In one embodiment, fit with other end symmetry after supporter corresponding is with it walked around in described thin-film body one end.

In one embodiment, wing second thin film that described thin-film body comprises the first film and is connected with described the first film, described the first film is wound around described supporter, and described second thin film is arranged on described the first film, and the width of described second thin film is greater than the width of coated described supporter.

In one embodiment, described thin-film body comprises inner membrance and adventitia, and described inner membrance and described adventitia lay respectively at the both sides of described supporter, and snugly coated described supporter is at least partially each other.

In one embodiment, described thin-film body is fixed on described supporter by fixture.

In one embodiment, described filter also comprises organizes flexible connecting member more, often organizes flexible connecting member and is located in the interval between two adjacent described thin-film bodies, and be connected with adjacent two described thin-film bodies.

In one embodiment, described supporter and/or described thin-film body surface are provided with class PEG coating or class PEO coating.

In one embodiment, be provided with anchor thorn outside described supporter, described anchor pierces through out described thin-film body, and tilts towards described nearly heart direction.

Compared with prior art, each supporter of filter of the present utility model is coated with the thin-film body that width is greater than supporter, under the washing away of blood flow, described thin-film body can float, therefore can reduce or avoid climbing of tube chamber endothelium to cover, simultaneously the tissue of supporter both sides also can be avoided to be combined with each other and the phenomenon of coated supporter that causes; Meanwhile, between two adjacent thin-film bodies, be provided with interval, can prevent the overlay film body of filter surface and lumen wall from forming interlayer, thus avoid the formation of thrombosis.

Accompanying drawing explanation

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

Fig. 1 a-Fig. 1 b is the overall structure schematic diagram of the filter of non-overlay film of the present utility model;

Fig. 2 a-2c is the front view of the first embodiment filter of the present utility model;

Fig. 3 is the top view of filter in Fig. 2;

Fig. 4 and Fig. 6 is the partial structurtes schematic diagram that the first embodiment mesosome is installed on two kinds of embodiments on support bar;

Fig. 5 is the decomposition texture schematic diagram of Fig. 4;

Fig. 7 a-7d is the front view of the second embodiment of the present utility model;

Fig. 8 is the top view of filter in Fig. 7;

Fig. 9 is the partial structurtes schematic diagram that the second embodiment mesosome is installed on a kind of embodiment on support bar;

Figure 10 is the axonometric chart of the filter of the 3rd embodiment;

Figure 11 is the front view of filter in Figure 10;

Figure 12 is the top view of filter in Figure 10;

Figure 13 is the axonometric chart of the filter of the 4th embodiment;

Figure 14 is the front view of filter in Figure 13;

Figure 15 is the top view of filter in Figure 13;

Figure 16 is the axonometric chart of the filter of this utility model the 5th embodiment;

Figure 17 is the front view of the filter in Figure 16;

Figure 18 is the top view of filter in Figure 16.

Figure 19 is the distressed structure schematic diagram of the filter of non-overlay film in Fig. 1.

Detailed description of the invention

In order to there be understanding clearly to technical characteristic of the present utility model, object and effect, now contrast accompanying drawing and describe filter of the present utility model in detail.

Please with reference to Fig. 1 a to Fig. 6, multiple supporters 3 that the filter that this utility model one embodiment provides comprises first end 1 and gives off in the same way from first end 1.Wherein, as shown in Figure 1 b, each supporter 3 comprise the extraction section 31 that gives off from first end 1 and with draw that section 31 is connected and the radial support section 32 extended vertically; Each extraction section 31 comprises lead segment 311 and the first son field 312; Each lead segment 311 one end is connected with first end 1, and the other end is connected with two the first son fields 312 respectively, and these two the first son fields 312 form angle, coordinates form Y-shaped structure with a lead segment 311.Cross near self one in two the first son fields 312 that every root first son field 312 is corresponding with adjacent lead segment 311, axially extend to form radial support section 32.

Equally as shown in Figure 1 b, described filter also comprises multiple second son field 331 and multiple convergence section 332, each radial support section 32 is connected with second son field 331 respectively away from one end of first end 1, two adjacent second son fields 331 cross mutually away from one end of radial support section 32, coordinate with a convergence section 332 afterwards and form Y-shaped structure, many convergence section 332 converge at the second end 4.

Filter supporter 3 is on the whole in unsymmetric structure, namely the quantity of the first son field 312 is more than the quantity of the second son field 331, the such as radical of the first son field 312 can be the twice of the second son field 331, and the quantity of drawing section 31 and convergence section 332 body of rod is equal.

Supporter 3 is made up of material such as the Nitinol with shape memory, and after filter is delivered to tube chamber, filter can recover deformation to deployed condition after discharging from the carrier pipe sheath of carrier, is held in lumen wall to make at least part of radial support body 3.Be provided with anchor thorn 2 outside supporter 3, and anchor thorn 2 tilts towards nearly heart direction, when filter is placed in tube chamber, anchor thorn 2 penetrates into the tissue of lumen wall, realizes filter fixing in tube chamber.

In the present embodiment, the second end 4 is distal end, and first end 1 is proximal part.In the process of carrying out thrombosis filtration, blood flow flows from distal end to proximal part, first thrombosis passes through from the space that the second son field 331 that body of rod density is less is formed, enter into filter inside, stop to be retained in filter inside via the first son field 312 that body of rod density is larger afterwards, thus realize the filtration to thrombosis.The second end 4 is provided with coupler body, for being taken out by the filter after carrying out thrombosis filtration.

As Fig. 2 a ?shown in 2c, each supporter 3 is coated with wing thin-film body 5 in radial support section 32, the width of this thin-film body 5 is greater than the width that supporter 3 is wrapped by part, and extends along supporter 3 to the both sides of supporter 3, is spaced from each other between the thin-film body 5 simultaneously on adjacent two supporters 3.

Concrete, as shown in FIG. 4 and 5, this thin-film body 5 comprises the first film 50 and the second thin film 51.This first film 50 forms the basement membrane be wound in radial support section 32; Second thin film 51 comprises and is arranged at inner membrance 511 that is in filter and that adhere on the first film 50 (basement membrane), and is arranged at adventitia 512 that is outside filter and that adhere on the first film 50 (basement membrane).Inner membrance 511 and adventitia 512 coordinate the shape of radial support section 32 to arrange, and extend respectively to the both sides of radial support section 32.Be positioned at radial support section 32 homonymy inner membrance 511 and adventitia 512 is bonded to each other or sew up, being fixedly connected with of both realizations, now radial support section 32 is held between inner membrance 511 and adventitia 512 together with the first film 50 (basement membrane), and the anchor thorn 2 be arranged in radial support section 32 passes the second thin film 51.Be understandable that, inner membrance 511 and adventitia 512 also can be one-body molded.

Wherein, the distance range that in the second thin film 51, inner membrance 511 and adventitia 512 extend to radial supporting section 32 both sides is 2-7mm.The first film 50 preferably selects thickness to be 0.003mm-0.050mm, and width is 2mm-7mm band-like film, and this band-like film is spiral winding in radial support section 32, and each circle of this band-like film is just disposed adjacent between enclosing with upper one or overlaps.

Due to the existence of the first film 50 (basement membrane), the adhesion between overlay film and supporter 3 can be improved, come off from supporter 3 to prevent thin-film body 5.Anchor thorn 2 simultaneously outside supporter 3 passes thin-film body 5 and arranges and also further enhancing the firmness of thin-film body 5 on supporter.

Because filter is compressed by tube chamber after implantation tube chamber, except radial support section 32, radial support section 32 may also can contact with lumen wall with the part supporter 3 between first end 1 and the second end 4.As shown in Fig. 2 a ?2c, in order to blood vessel and smooth muscle can be suppressed further to the parcel of supporter 3, thin-film body 5 from the end of radial support section 32 also respectively to nearly heart direction/and or heart direction far away extend, and extended distance scope is 5mm to 8mm.Wherein, same with reference to shown in Fig. 4 and Fig. 5, thin-film body 5 is identical with the combination of radial support section 32 with thin-film body 5 with the combination of the supporter 3 between first end 1 and the second end 4, just repeats no more herein.

And for example shown in Fig. 2 a to Fig. 3, the present embodiment filter also comprises many group flexible connecting members 6, often organizes flexible connecting member 6 and is located in the interval between two adjacent thin-film bodies 5, and be connected with adjacent two thin-film bodies 5.Filter is being delivered in the process of tube chamber by carrier, filter is in contraction state, thin-film body 5 is also be in buckle condition, after implanting tube chamber, flexible connecting member 6 can pull thin-film body 5 to launch, thus avoids the fold of thin-film body 5 and bonded to each other between the thin-film body 5 of supporter 3 both sides.

Often organize each flexible connecting member 6 in flexible connecting member 6 to be spaced from each other or mutually arranged in a crossed manner, then still form opening between each flexible connecting member 6, therefore filter is when being placed in tube chamber, there will not be the phenomenon forming interlayer between the thin-film body 5 between two adjacent supporters 3 and lumen wall, prevent blood flow to flow into thrombosed phenomenon between thin-film body 5 and lumen wall.

Flexible connecting member 6 can for PP line, catgut, also can for chemosynthesis surgical thread (being such as PGA, PGLA, PLA line).Be understandable that, this flexible connecting member 6 can be by pasting, sewing up or the mode of thermal-adhering is connected with thin-film body 5, also can be and connection that the integrated mode of thin-film body 5 realizes between thin-film body 5.When flexible connecting member 6 and thin-film body 5 are one-body molded, optionally in flexible connecting member 6 be also folded with interlayer, this interlayer extends to thin-film body 5 inside to increase the intensity of flexible connecting member 6.

In this embodiment, due to supporter 3 be provided with width be greater than the thin-film body 5 of coated supporter 3 width, then this thin-film body 5 forms at least one and can wash away lower floating alar part at blood flow, because thin-film body 5 waves, increase the growth difficulty of endotheliocyte on its surface, thus decrease endothelium and climb and cover.It is known that, filter is not be in the state launched completely being placed in tube chamber, because lumen wall is to the pressure effect of filter, filter has certain contraction relative to free state, even therefore flexible connecting member 6 exist thin-film body 5 also can blood flow wash away lower float.

In addition, because the width of thin-film body 5 is greater than coated supporter 3 width, namely the alar part that this thin-film body 5 is formed can play the endotheliocyte or the effect that combines completely of smooth muscle that intercept and be positioned at supporter 3 both sides propagation, thus avoids supporter 3 and wrapped up by endotheliocyte or smooth muscle.

Wherein, thin-film body 5 is preferably selected employing to have T suppression cell and is climbed the material covering function, can prevent endotheliocyte from swashing at thin-film body 5 further and cover.In the present embodiment, thin-film body 5 is PTFE film, PET film or PP film etc.

In order to improve the performance that supporter 3 prevents from endothelium from climbing covering further, filter in the present embodiment can also in conjunction with have good anti-protein adhere to climb the function covered with endotheliocyte class PEG or class PEO coating together with use, to extend the time window that filter can take out safely.The set-up mode of class PEG or class PEO coating can be: directly in filter supporter 3 (non-overlay film) upper coating class PEG or class PEO coating, or class PEG coating or class PEO coating are set on thin-film body 5 surface of filter, or while class PEG coating or class PEO coating are set on supporter 3, class PEG coating or class PEO coating are also set on the surface of thin-film body 5.Wherein, the generation type of class PEO or class PEG coating is plasma reinforced chemical vapour deposition (PECVD) method or alternate manner, and these technology are prior art, just repeat no more herein.

The structure of thin-film body 5 is not limited to above-mentioned, can also be as under type;

Such as, thin-film body 5 also can not comprise the first film 50 (basement membrane), only comprise inner membrance 511 and adventitia 512, inner membrance 511 and adventitia 512 are arranged at the inside and outside both sides of filter respectively, realize being connected of inner membrance 511 and adventitia 512 by being connected with adventitia 512 by the inner membrance 511 being arranged at supporter 3 homonymy.

Again such as, as shown in Figure 6, thin-film body 5 can comprise and is arranged at monofilm that is outside supporter 3 and that be connected with supporter 3, and this monofilm is connected with supporter 3 by fixture such as suture 8 grade.Optionally, also can coated the first film 50 (basement membrane) on supporter 3.

Again such as, thin-film body 5 can comprise and is arranged at monofilm that is inside supporter 3 and that be connected with supporter 3, now supporter 3 is coated with basement membrane or is provided with class PEG or class PEO coating.This monofilm is connected with supporter by the mode of suture, stickup or thermal-adhering.

Shown in Fig. 7 a-Fig. 7 d, Fig. 8, it is the filter that the another embodiment of this utility model provides.Compared with previous embodiment, in the present embodiment, at least part of thin-film body 5 is only extended to the side of supporter 3 by supporter 3,

Namely thin-film body 5 that can be whole all only extends to the side of supporter 3; Or part thin-film body 5 extends to the side of supporter 3, part thin-film body 5 extends to the both sides of supporter 3.Wherein, the thin-film body 5 extended to supporter 3 side can extend to any side of corresponding supporter 3 with it.

Concrete, as thin-film body 5 in Fig. 7 a-Fig. 7 d, Fig. 8 is sheared towards nearly heart direction or heart direction far away at the edge of the radially supporting section 32 of thin-film body 5 side simultaneously in previous embodiment with inner membrance 511 and adventitia 512, only retains that other side formed.

Structure as shown in Figure 9, when thin-film body 5 is extended to nearly heart direction by the end of radial support section 32, thin-film body 5 also can be coated on be connected with radial support section 32 and two first son fields 312.

Now, thin film for coated supporter 3 is monofilm, first by monofilm lateral margin along supporter 3 circumference be wound around and coated supporter 3 forms joint portion, another lateral margin of this monofilm is extended along any side of supporter 3, and this another lateral margin and joint portion are connected by the mode of thermal-adhering, stickup or stitching.

(not shown) that formed after formation structure as shown in Figure 9 can also be after supporter 3 corresponding is with it walked around in one end of the thin-film body 5 of supporter 3 both sides extension and the other end is fitted.Or will there is thin-film body 5 side of inner membrance 511 and adventitia 512 simultaneously along supporter 3 edge towards shearing in previous embodiment, only retain other side formed.

In the present embodiment, other modes also can be adopted to form thin-film body 5, as long as while thin-film body 5 can be made to extend to the side of supporter 3, and wrap the supporter 3 be connected with thin-film body 5.

Shown in Figure 10-Figure 12, in the filter that another embodiment of this utility model provides, thin-film body 5 is only extended to filter inside by supporter 3.

Forming the present embodiment thin-film body 5 can be formed after fitting with other end symmetry after the one end of the thin-film body 5 extended to supporter 3 both sides being walked around supporter 3 corresponding with it.Also can be the thin-film body 5 of employing monofilm in the present embodiment, the circumference of monofilm lateral margin along supporter 3 is wound around and coated supporter formation joint portion, make that another lateral margin of this monofilm is inner along supporter 3 to filter to be extended, make this another lateral margin and joint portion by pasting, sewing up or the mode of thermal-adhering is connected simultaneously.

Fit with the other end after supporter 3 corresponding is with it walked around in the one end of the thin-film body 5 extended to supporter 3 both sides by preferred selection and form the thin-film body 5 of the present embodiment.In the present embodiment, by by the adhesion more enhanced between thin-film body 5 and supporter 3 bonded to each other for the thin-film body 5 of supporter 3 both sides.

Please also refer to Figure 13-Figure 15, in the filter that the another embodiment of this utility model provides, flexible connecting member 6 is not set.

Please also refer to Figure 16-Figure 18, in the filter that this utility model one embodiment provides, flexible connecting member 6 is not also set.

The shape of supporter 3 does not limit above-mentioned mode, can be following mode: as shown in figure 19 yet, multiple supporters 3 that filter comprises first end 1 and gives off in the same way from first end 1.Wherein, each supporter 3 comprises the extraction section 31 that gives off from an end and is connected and the radial support section 32 extended vertically with extraction section 31; Extraction section 31 comprises lead segment 311 and the first son field 312, first son field 312 connects lead segment 31 and radial support section 32; Multiple supporter 3 also comprises multiple second son field 331 and convergence section 332, and multiple convergence section 332 converges formation the second end 4, second son field 331 and connects radial support section 32 and convergence section 332.

The density of radial support section 32 and the body of rod between first end 1 and the second end 4 is greater than the density of the radial support section 32 of the filter in the first embodiment and the body of rod between first end 1 and the second end 4.Now, for extraction section 31, with the first embodiment unlike, set up a Y shape bar 313 between two adjacent extraction sections 31, one end of this Y shape bar 313 is connected with first end 1, and the two ends of the other bifurcated of this Y shape bar 313 are connected to the first adjacent with it son field 312.For convergence section 332 and the second son field 331, with the first embodiment unlike, each radial support section 32 connects two the second son fields 331, and second son field 331 that the radial support section 32 that each second son field 331 is adjacent with is connected crosses and is connected with convergence section 332.Namely two son fields be connected with convergence section 332 form " V " shape structure.

By reference to the accompanying drawings embodiment of the present utility model is described above; but this utility model is not limited to above-mentioned detailed description of the invention; above-mentioned detailed description of the invention is only schematic; instead of it is restrictive; those of ordinary skill in the art is under enlightenment of the present utility model; do not departing under the ambit that this utility model aim and claim protects, also can make a lot of form, these all belong within protection of the present utility model.

Claims (16)

1. a filter, the multiple supporters comprising first end and give off in the same way from described first end, it is characterized in that, each described supporter be coated with wing thin-film body at least partially, the width of described thin-film body is greater than the width of the part that described supporter is wrapped by, and the described thin-film body on adjacent two supporters is spaced from each other.

2. filter according to claim 1, is characterized in that, each described supporter comprises the extraction section that gives off from described first end and is connected and the radial support section extended vertically with described extraction section; The coated described radial support section of described thin-film body.

3. filter according to claim 2, is characterized in that, each described extraction section comprises lead segment and two the first son fields; Described lead segment one end is connected with first end, the other end is connected with described first son field respectively, these two the first son fields form angle, and coordinate with described lead segment and form Y-shaped structure, cross near self one in two the first son fields that first son field described in every root is corresponding with adjacent described lead segment, axially extend to form described radial support section.

4. filter according to claim 3, it is characterized in that, described filter also comprises the second end, multiple second son field and multiple convergence section, each described radial support section away from described first end one end respectively second son field described be connected, two adjacent the second son fields cross and extend to form described convergence section, and many described convergence section converge at described the second end.

5. filter according to claim 4, is characterized in that, the radical of described first son field is more than the second son field.

6. filter according to claim 2, is characterized in that, described thin-film body also extends 5-8mm from described radial support section to nearly heart direction and/or heart direction far away.

7. the filter according to any one of claim 1-6, is characterized in that, described thin-film body is climbed the material covering function make by being had T suppression cell.

8. the filter according to any one of claim 1-6, is characterized in that, each described thin-film body is extended to the both sides of described supporter or side by described supporter.

9. filter according to claim 7, is characterized in that, it is 2-7mm that each described thin-film body extends amplitude by described supporter to described supporter both sides or side.

10. the filter according to any one of claim 1-6, is characterized in that, fits after supporter corresponding is with it walked around in described thin-film body one end with other end symmetry.

11. filters according to any one of claim 1-6, it is characterized in that, wing second thin film that described thin-film body comprises the first film and is connected with described the first film, described the first film is wound around described supporter, described second thin film is arranged on described the first film, and the width of described second thin film is greater than the width of coated described supporter.

12. filters according to any one of claim 1-6, it is characterized in that, described thin-film body comprises inner membrance and adventitia, and described inner membrance and described adventitia lay respectively at the both sides of described supporter, and snugly coated described supporter is at least partially each other.

13. filters according to any one of claim 1-6, it is characterized in that, described thin-film body is fixed on described supporter by fixture.

14. filters according to any one of claim 1-6, it is characterized in that, described filter also comprises organizes flexible connecting member more, often organizes flexible connecting member and is located in the interval between two adjacent described thin-film bodies, and be connected with adjacent two described thin-film bodies.

15. filters according to any one of claim 1-6, it is characterized in that, described supporter and/or described thin-film body surface are provided with class PEG coating or class PEO coating.

16. filters according to claim 6, is characterized in that, be provided with anchor thorn outside described supporter, described anchor pierces through out described thin-film body, and tilt towards described nearly heart direction.