CN209136977U - A kind of not damaged retrievable vena cava filter - Google Patents

Abstract

The utility model discloses a kind of not damaged retrievable vena cava filter, including the cage bracket made of the braiding of Ultimum Ti silk, more elastic alloy wires are centered around the same central axis, and the both ends of elastic alloy wire are fixed on upper and lower two and are equipped in the end cap of recovering hook.The medicinal balloon of two medical macromolecular materials production is symmetrically inlayed in the linear shape of alloy wire intermediate stage, every alloy wire top.The utility model realized using symmetrical medicinal balloon macromolecular material surface and is accurately positioned, and when release is not easy to tilt.Simple and stable structure, end cap, alloy wire, sacculus are symmetrical, and filter upper and lower part forms the double-deck mesh basket, can effectively filter thrombus.The arc-shaped surface of sacculus can damage to avoid conventional filter hangnail to blood vessel, while balloon interior drug can prevent vascellum endometrial hyperplasia and climb to cover, and may be implemented to be placed in for a long time.It is equipped with upper and lower two recovering hooks simultaneously, can still be taken out from femoral vein or jugular vein after merging, realizes two-way recycling and simple to operate, reduces the risk of second operation.

Description

A kind of not damaged retrievable vena cava filter

Technical field

The present invention relates to medical instruments field, specially a kind of not damaged retrievable vena cava filter.

Background technique

Acute treatment of venous thromboembolism (Venous Thrombo Embolism, VTE) includes Deep vain thrombosis (Deep Venous Thrombosis, DVT), pulmonary embolism (Pulmonary Embolism, PE) and postthrombotic syndrome, it is concurrent The importance of disease is not only only that they cause the common of Death to prevent one of reason or many potential chronic diseases Risk factor.Studies have shown that causing most of embolus of PE derives from DVT.

Inferior vena cava filter (Inferior Vena Cava Filters, IVCF) clinically has been widely used, and is pre- The effective measures of anti-PE.Mortality thrombus that IVCF can be captured is it is possible to prevente effectively from or reduce the severe complications such as PE Occur.

Filter can be divided into three classes at present: permanent filter, recyclable filter, provisional filter.

Recyclable filter, which passes through, utilizes special recovery system, is carried out by interventional method from human body femoral vein or jugular vein Recycling.But current vena cava filter is easy to damage under blood vessel, or even appearance to realize that accurate positionin mostly uses barb structure The phenomenon that vena cave is perforated.Some vena cava filters contact too much with blood vessel, and vascellum endometrial hyperplasia, smooth muscle migration cause Vena cava filter is coated by blood vessel and is bonded, and the time is if it exceeds 2 weeks would become hard to take out, if recycling may cause blood vessel by force The damage of wall.

Summary of the invention

The object of the present invention is to provide a kind of not damaged retrievable vena cava filters.The vena cava filter structure is simple, releases It is not easy inclination when putting, it can be achieved that being accurately positioned, while can avoid the damage to blood vessel, effectively prevention vascellum endometrial hyperplasia And climb and cover, endothelialization degree is reduced, and convenient for placing and recycling.

To solve the above-mentioned problems, the present invention adopts the following technical scheme: a kind of not damaged retrievable vena cava filter, more The medical shape-memory alloy wire of root is weldingly fixed in the first end cap at lantern-shaped one end, and the end of shape-memory alloy wire is also welded Fixed constraint is connect in the second end cap, and the first end cap, the second end cap are equipped with recovering hook on a center line.

Shape-memory alloy wire is divided into three sections to smoothly transit from the first end cap to the second end cap: being respectively the first camber line Section, straightway, the second arc segment, straightway is parallel with filter central axis, and 10~30 millimeters of length, straightway upper and lower position is equipped with Grasp, the fixation for medicinal balloon.

Two spheroidal medicinal balloons, and symmetrical reality are inlayed above and below every alloy wire middle straight line section grasp position The accurate positionin of existing filter.It is made outside sacculus of medical macromolecular materials, while guarantee does not wash away deformation by blood, moreover it is possible to It allows the internal drug for preventing endometrial hyperplasia from developing to play a role, effectively slows down vascular cell in the speed of growth of balloon surface, The probability that can not be taken out due to endometrial hyperplasia cladding filter is reduced, and then extends recovery time.

Medicinal balloon diameter can be adjusted according to the merging time, and 3~8 millimeters of balloon diameter, it is preferred that sacculus 5~8 millimeters of diameter.

Above-mentioned shape-memory alloy wire, upper and lower end cap are all made of alloy material, preferably Nickel-titanium alloy for medical purpose material.

Above-mentioned shape-memory alloy wire is formed by special die is thermally treated, and 0.2~1 millimeter of string diameter, preferably 0.5~0.8 millimeter.

Above-mentioned alloy wire quantity 4~16, preferably 6~12.

Above-mentioned first end cap, the second end cap be cylindrical barrel open at one end, 0.2~0.5 millimeter of wall thickness, and first End cap, the second end cap are equipped with recovering hook.

Filter of the present invention diameter under free expanding state is 20~40 millimeters, and length is 25~45 millimeters.

Compared with prior art, the invention has the advantages that

1) simple and stable structure, end cap, alloy wire, sacculus are symmetrical, and filter upper and lower part forms the double-deck mesh basket, energy Effectively filtering thrombus.Sacculus macromolecular material surface is contacted with vascular wall after merging, can be solved conventional filter and is subjected to displacement and incline Oblique problem, while filter overall structure shrinkage is good, when recycling, are easier to enter in sheath, reduce medical worker's recycling Operation difficulty.

2) balloon interior drug can slow down vascular cell in the speed of growth of balloon surface, reduce due to endometrial hyperplasia packet The probability that filter can not take out is covered, and then extends recovery time.

3) filter is set there are two recovering hook, can carry out two-way recycling, during filter release, can at any time be returned filter It receives into delivery sheath, is discharged again after adjusting suitable position, and then filter is made to have optimum position.

Detailed description of the invention

Fig. 1 is a kind of structural schematic diagram of not damaged retrievable vena cava filter of the present invention.

Fig. 2 is main view of the invention.

Fig. 3 is top view of the invention.

Fig. 4 is left view of the invention.

In figure: 1, the first end cap；2, the first camber line silk；3, sacculus；4, straight line silk；5, the second camber line silk；6, the second end cap.

Specific embodiment

In order to illustrate more clearly of the present invention, so that advantages and features of the invention be enable to be managed by those skilled in the art Solution, is with reference to the accompanying drawing explained in detail the present invention.The content of specific descriptions is illustrative rather than restricted, does not answer It is limited the scope of the invention with this.

Embodiment 1

As shown in Figure 1, a kind of not damaged retrievable vena cava filter, 6 medical shaped-memory nitinol silks are at lantern Shape one end is weldingly fixed in the first end cap 1, and the end welding of shape-memory alloy wire constrains in the second end cap 6, and the One end cap, the second end cap are equipped with recovering hook on same center line.Shape-memory alloy wire is from the first end cap to second end Cap smoothly transits, and is made of the first arc segment 2, straightway 4, the second arc segment 5, by the thermally treated sizing of special die At.

Two spheroidal medicinal balloons 3, and symmetrical reality are inlayed above and below 6 alloy wire middle straight line section grasp positions The accurate positionin of existing filter.It is made outside sacculus of medical macromolecular materials, guarantee does not wash away deformation by blood.Internal drug can To slow down vascular cell in the speed of growth of balloon surface, the probability that can not be taken out due to endometrial hyperplasia cladding filter is reduced, into And extend recovery time.

As shown in Figure 2,3, 4, the filter constructions simple and stable, end cap, string diameter, sacculus are symmetrical, and filter top is under Portion forms the double-deck mesh basket, can effectively filter thrombus.Balloon surface is contacted with vascular wall after merging makes filter be less likely to occur to be displaced And inclination.End cap is equipped with recovering hook to filter up and down, can carry out two-way recycling, be easier to enter during filter is discharged and recycled In sheath, filter can be recycled in delivery sheath at any time, discharged again after adjusting suitable position, and then it is best to have filter Position significantly reduces the operation difficulty of medical worker.

It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments.Therefore nothing By from the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended Claim rather than above description limit, it is intended that by all changes in the meaning and scope of the equivalent requirements of the claims Change is included within the present invention.Any reference signs in the claims should not be construed as limiting the involved claims.

Claims (5)

1. a kind of not damaged retrievable vena cava filter, it is characterised in that: more medical shape-memory alloy wires are at lantern-shaped one End is weldingly fixed in the first end cap, and the end of shape-memory alloy wire, which is also welded and fixed, to be constrained in the second end cap, and the One end cap, the second end cap are equipped with recovering hook on a center line；

Shape-memory alloy wire is divided into three sections to smoothly transit from the first end cap to the second end cap: being respectively the first arc segment, straight Line segment, the second arc segment, 0.2~1 millimeter of string diameter；Straightway is parallel with filter central axis, and 10~30 millimeters of length；It is closed at every Spun gold middle straight line section upper and lower position is equipped with grasp, and spheroidal medicinal balloon is embedded on grasp, and sacculus is symmetrical and then real The accurate positionin of existing filter；

It is made outside sacculus of medical macromolecular materials, guarantee does not wash away deformation by blood；It is thin that internal drug can slow down blood vessel Born of the same parents are in the speed of growth of balloon surface, when reducing the probability that can not be taken out due to endometrial hyperplasia cladding filter, and then extending recycling Between.

2. a kind of not damaged retrievable vena cava filter according to claim 1, it is characterised in that: medicinal balloon diameter 3 ~8 millimeters.

3. a kind of not damaged retrievable vena cava filter according to claim 1, it is characterised in that: marmem Silk, upper and lower end cap are all made of Nickel-titanium alloy for medical purpose material.

4. a kind of not damaged retrievable vena cava filter according to claim 1, it is characterised in that: alloy wire quantity 4~ 16.

5. a kind of not damaged retrievable vena cava filter according to claim 1, it is characterised in that: the first end cap, second End cap is cylindrical barrel open at one end, for being welded and fixed for alloy wire, 0.2~0.5 millimeter of wall thickness, and the first end cap, Second end cap is equipped with recovering hook.