CN205433998U - Die cavity vein filter of can changeing - Google Patents

Abstract

The utility model discloses a die cavity vein filter of can changeing, a serial communication port, including the filter house of middle degradable ligature portion, degradable ligature portion both sides, and the both ends constituteed of the supporting part at both ends are open, two horn -shaped structure of middle ligature, degradable ligature portion is formed by degradable cellosilk ligature filter house, degradable cellosilk degradation back, and the filter house is the cylindrical bracket structure. More the large size thrombus can be tackled in the pulmonary embolism critical days to this vena cave filter device, prevents the emergence of pulmonary vein embolism to ging through the back critical days in the pulmonary embolism, because of the degradation of some material of construction, making the part function of filtration, interception thrombus suspend or the forfeiture, make filter inside open -minded completely, the supporting part of this filter was still kept somewhere in the normal position this moment, was equivalent to an adherence support.

Description

Can transformant vena cava filter

Technical field

This utility model relates to one can transformant vena cava filter.

Background technology

The acute disease that pulmonary infarction (Pulmonaryembolism, PE) is clinical onset rate, mortality rate is higher, its sickness rate intentions angiopathy the 3rd, it is only second to hypertension and coronary heart disease, its mortality rate is 25～30%.According to incompletely statistics, China has 35.5 ten thousand example Pulmonary Embolism Patients at present.

Pulmonary infarction is owing to the thrombus breaks loose of around deep venous thrombosis or right cardiac cavity enters pulmonary circulation, and blocking pulmonary artery or its branch are, and then a series of clinical pathology physiological changes based on pulmonary circulatory function obstacle of causing.Result of study shows, causes the thrombosis that the embolus 75～90% of pulmonary infarction derives from pelvic veins or deep veins of lower limb comes off.Thrombosis after coming off moves on to cardiopulmonary in caval vein system, causes pulmonary embolism.

Vena cava filter (Venacavafilter, VCF) it is to come off a kind of filtering device causing pulmonary embolism and design for prevention superior and inferior vena cave system embolus, can be used for anticoagulant and avoid and have acute pulmonary embolism or the patient of acute near-end (above knee) venous thrombosis.

Along with clinical technology and the development of manufacturing technology, performance and the implantation of vena cava filter have had significant progress.Vena cava filter is Interventional Radiography and the usual armarium of Vascular surgeons.In operation, by puncturing radicular vein or jugular mode and by vena cava filter implant cavity vein under contrastographic picture assists.Vena cava filter is divided into permanent filter and provisional filter (the most recyclable filter).Vena cava filter in early days is all permanent, insert after in caval vein and cannot take out with intervening mode, it also it is endovascular foreign body due to vena cava filter, there is the danger of induction thrombosis equally, therefore the client need long-term anticoagulant therapy after placed cavity vein filter, this just brings inconvenient and hemorrhage danger to patient.The invention of provisional filter, has not only acted as the effect of prevention pulmonary infarction, the most also avoids the risk of itself induction thrombosis.Insert provisional filter in the acute stage of patient's deep vein thrombosis of lower extremity, and after acute stage, the risk of thrombus breaks loose is drawn off with intervening mode when reducing again.

Vena cava filter in early days is designed to beveled structure more, intercepts thrombosis free in blood vessel.But, the design of this structure easily tilts in venous lumen, shifts.For preventing displacement or the drift of filter, in the middle of filter tinsel head end or metallic rod, increase barb structure, enable filter to be fixed in blood vessel wall.But, the tinsel of band agnail directly thrusts blood vessel wall, and blood vessel wall can cause certain damage, and the serious vein tube wall that pierces through causes hemorrhage, even thrusts the internal organs such as small intestinal, colon and causes infection.

Spindle-type filter has thick waist structure in design, can play a supporting role, and is difficult to.Wherein, within 2～3 weeks, can take out external after the implantation as provisional filter without agnail fixed pattern, the type having agnail fixing can not only be used for provisional filter, it is possible to is placed in the patient as permanent filter.Although this design serves preferable fixation, but, owing to after spindle-type filter many employings Nitinol pipe laser engraving, high-temperature shaping forms, there is wire breakage causes subside damage caval vein inwall, blood vessel embolism of filter constructions to cause the smooth equivalent risk of blood circulation, and document is the most repeatedly reported.

At present, the kind of vena cava filter is more, such as: the United States Patent (USP) of Patent No. US20090187211A1 discloses a kind of vena cava filter, this filter is to use the braiding of NiTi memory alloy wire to form, overall structure is double horn shape, both ends open, and middle shrinkage is funnel-form.Both end of which opening portion is similar to intravascular stent structure, plays a supportive role.Middle hopper portion is bi-conical, connects at afterbody at two circular cones, acts the effect filtering thrombosis.This vena cava filter has a double medium filtration layer, and uses that NiTi silk is close weaves into net.

Although above-mentioned patent fixed part is with blood vessel laminating closely, good fixing effect is difficult to displacement, tilts.Additionally, due to the braiding of this gauze filter is closeer, can as often as possible capture thrombosis.But this close netting structure is in actual clinical uses, the thrombosis of large and small size is all captured by filter house, and therefore relatively short period of time i.e. may result in caval vein blocking, then causes more serious embolism of vena cava.Even if the vena cava filter of said structure does not use the mode of the close volume of NiTi silk, change sparse weaving manner into, also can should be its double-layer filter structure and undersized blood vessel be intercepted and gradually causes caval vein to block.

It addition, this vena cava filter is permanent implanted class, after also there is higher implantation, thrombosis complication at a specified future date, threatens the life of patient.

Summary of the invention

Problem to be solved in the utility model is that existing vena cava filter easily causes caval vein to block after capture thrombosis.

In order to solve the problems referred to above, this utility model provides one can transformant vena cava filter, it is characterized in that, including the both ends open of supporting part composition, the double horn shape structure of middle ligation at middle degradable ligation portion, the filter house of both sides, degradable ligation portion and two ends；Described degradable ligation portion is formed by biodegradable fiber silk ligation filter house, and after the degraded of biodegradable fiber silk, filter house is cylinder-shaped bracket structure.

This vena cava filter is main material with nitinol alloy wire, in conjunction with degradable macromolecule silk material, by the method for braiding prepare can transformant vena cava filter.This filter is made up of three parts: supporting part, filter house and ligation portion.

Described vena cava filter is both ends open, the double horn shape structure of middle ligation.Fixed part is the structure of both ends open, with the laminating of caval vein inwall closely, NiTi B alloy wire is woven to monolayer netted.Filter house is tubaeform, and by n root (n=8/10/12/14/16) NiTi B alloy wire, adjacent two merging two-by-two twist into one, form n/2 root NiTi alloy rope, and one end ligatures, one end open.Described filter house bottom is ligatured by degradable macromolecule silk, and two ends pile, and forms double-layer filter structure.

After described vena cava filter implants, through special time period, filter house degradable ligature is degraded, the suffered binding force of NiTi rope disappears, and reverts to linear type under super-elasticity effect, and the function of the parts for filtering, block thrombosis is interrupted, inside filter the most open-minded, but filter indwelling is in situ, is equivalent to an adherent support, that is function is converted.

Above-mentioned can the preparation method of transformant vena cava filter be:

Using the braiding of NiTi B alloy wire shape-memory material, the thermally treated cylindrical shape intravascular stent structure that is fixed to, use degradable macromolecule cellosilk, by ligation in the middle of support, forms both ends open, and the two speaker set-up that centre ligatures, as vena cava filter.

This vena cava filter device, the thrombosis of large-size can be intercepted in the risk for pulmonary embolism phase, the generation of prevention pulmonary vein thromboembolism, and after the risk for pulmonary embolism phase tides over, because of part-structure material degradation, make filtration, intercept the component function interruption of thrombosis or lose, make inside filter the most open-minded, the now supporting part of this filter still indwelling, in situ, is equivalent to an adherent support, the i.e. function of vena cava filter and is converted.

Compared with the vena cava filter that tradition rustless steel or nickel-titanium alloy material use cutting and solder technology to prepare, the beneficial effects of the utility model are:

1.NiTi alloy good biocompatibility, corrosion-resistant, possess super-elasticity, release aftershaping is effective；

2. ligature described in is degradation material, and after special time is degraded, vena cava filter intermediate filtered portion function is interrupted, the most open-minded inside filter, changes into an adherent support；

3. this vena cava filter is because being converted into adherent support, it is not necessary to second operation takes out, and alleviates patient painful.The most not depositing the occurrence risk of thrombotic complications at a specified future date after the implantation, patient need not take all the life anticoagulant, improves quality of life of patients；

4. these vena cava filter two ends are that intravascular stent structure plays fixation, and NiTi silk elasticity is high, and compliance is good, and intravascular stent structure is tightr with the laminating of caval vein inwall, fixation；

5. design without agnail, reduce the damage to caval vein blood vessel；

The most according to actual needs, this vena cava filter standing part diameter, length may be designed to plurality of specifications；

7.NiTi B alloy wire weaving method technology maturation, it is not necessary to extra equipment and technique, cost is relatively low.

Accompanying drawing explanation

Fig. 1 for this utility model provide can transformant vena cava filter degraded before structural representation；

Fig. 2 is filter house and the cross-sectional view in degradable ligation portion before degraded；

Fig. 3 is the cross-sectional view of supporting part；

Fig. 4 for this utility model provide can transformant vena cava filter degraded after structural representation；

Fig. 5 is the schematic diagram before degrading during this utility model use；

Fig. 6 is the schematic diagram after degrading during this utility model use.

Detailed description of the invention

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

Embodiment

As Figure 1-3, a kind of the structural representation of transformant vena cava filter degradable ligation portion 1, the filter house 2 of both sides, degradable ligation portion 3 and the supporting part 1 at two ends of centre can be included for what this utility model provided, after this vena cava filter is woven by NiTi marmem, thermal finalization, both ends open, the double horn shape structure of middle ligation is ligatured into through biodegradable fiber silk.Described degradable ligation portion 3 is formed by biodegradable fiber silk ligation filter house 2, and after the degraded of biodegradable fiber silk, filter house 2 is cylinder-shaped bracket structure.Wherein, two ends supporting part 3 is unilayered vessels supporting structure；Filter house 2 degrade before Double-horn type symmetrically, n root (n=8,10,12,14 or 16) NiTi B alloy wire intersect two-by-two and be woven together, form n/2 root NiTi rope.

This utility model is used the initial stage as shown in Figure 1,5 at human body, through special time period, biodegradable fiber silk degraded in the middle of filter house 2, binding force suffered by the NiTi alloy rope of filter house 2 disappears, and reverts to linear type under super-elasticity effect, and the function of the parts for filtering, block thrombosis is interrupted, inside vena cava filter the most open-minded, but filter indwelling is in situ, be equivalent to an adherent support (such as Fig. 4, shown in 6), i.e. function is converted.

The vena cava filter prepared according to above-mentioned principle, structure and weaving method, it is also possible to be other metal wire materials such as stainless steel silk, titanium alloy wire, and non-degradable macromolecular fibre silk and degradable macromolecule cellosilk；Biodegradable fiber silk can be degradable magnesium alloy, degradable high polymer material etc..

If biodegradable fiber silk and scaffold fibers silk all use non-degradable material to replace, then this vena cava filter can use as permanent filter.

Claims (1)

1. one kind can transformant vena cava filter, it is characterized in that, the both ends open that forms including the supporting part (1) at middle degradable ligation portion (1), the filter house (2) of degradable ligation portion (3) both sides and two ends, the double horn shape structure of middle ligation；Described degradable ligation portion (3) is formed by biodegradable fiber silk ligation filter house (2), and after the degraded of biodegradable fiber silk, filter house (2) is cylinder-shaped bracket structure.