A kind of retrievable vena cava filter with good adherent property
Technical field
The present invention relates to a kind of vena cava filter.More specifically, a kind of retrievable vena cava filter with good adherent property is related to.
Background technology
Along with the development of modern medical techniques, place thrombus filter in human vas and be just constantly applied to clinical treatment as preventing a kind of effective means of blood vessel embolism and achieve good effect at present.Vena cava filter is mainly used in treating non-arterial thrombosis (being called for short pulmonary infarction, pulmonaryembolism, PE).PE is the pathological process being blocked by pulmonary artery or a certain branch of pulmonary artery by thrombosis or embolus and cause, and be a kind of severe complication of numerous disease, after thromboembolism, lung tissue produces serious blood supply disorder, necroses.In the clinical cause of death, occupy the 3rd, be only second to hypertension and coronary heart disease.Vena cava filter is effective treatment means, significantly reduces the incidence rate of pulmonary embolism.But insert for a long time due to IVCF and cause the complication such as inferior vena cava obstruction also to cause clinical concern gradually, postcava perforation can be caused owing to implanting for a long time, filter is shifted, secondary thrombus causes the complication such as inferior vena and DVT recurrence, therefore limit its popularization.Vena cava filter has now developed into the callable Wicresoft implanted treatment stage, but the barb that existing retrievable vena cava filter is not fixed, easy displacement and inclination after implant into body.
Therefore, need to provide a kind of vena cava filter, make its adherent property better, to solve displacement and the turning problem of filter, thus the effectiveness of filter emboli can be improved.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of retrievable vena cava filter with good adherent property.
For solving the problems of the technologies described above, the present invention adopts following technical proposals:
A kind of retrievable vena cava filter with good adherent property, comprise the net tubular support and the seizure pawl be arranged in described support and support bar that adopt medical metal wire braiding, described support has the sieve bottom outwardly forming arc-shaped, described seizure pawl is that taper is radially formed to some medical metal wire of the oblique extension of periphery by from the vertex of a cone, described support bar comprises main support rod and is connected the some branches strut of the other end to the oblique extension of periphery with one end with main support rod, the other end of described branch strut is bending arc-shaped and is positioned at the outside of described support, the vertex of a cone of described seizure pawl and one end of main support rod are all fixedly installed on the bottom centre of described support, described main support rod is positioned at the central axis place of described support, the outside of the bottom centre of described support is provided with recovering hook.After adopting said structure, the end in bending arc-shaped of branch's strut contacts the effect can playing mooring anchor with blood vessel, and can not scratch blood vessel wall, and can also do small adjustment according to the internal diameter of blood vessel improves its adherent property simultaneously.
Preferably, described recovering hook is barb shape when can avoid recovery, blood vessel wall being caused to scuffing.
Preferably, described branch strut comprises the first branch's strut be connected with one end of described main support rod respectively and the second branch's strut be connected with the other end of described main support rod, described first branch's strut is two medical metal wire, and described second branch's strut is two medical metal wire.Branch's strut also can play preliminary filtration, and arranges each 2 branch's struts up and down, can avoid the inclination of vena cava filter.
Preferably, described seizure pawl is made up of with 60 degree, interval angle 6 medical metal wire.Catch the effect that pawl can play secondary filter.
Preferably, the material of described support, seizure pawl and support bar is Nickel-titanium alloy for medical purpose.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Fig. 1 illustrates structural representation of the present invention.
Fig. 2 illustrates the partial enlarged drawing of sub-support boom end of the present invention.
Detailed description of the invention
In order to be illustrated more clearly in the present invention, below in conjunction with preferred embodiments and drawings, the present invention is described further.Parts similar in accompanying drawing represent with identical Reference numeral.It will be appreciated by those skilled in the art that specifically described content is illustrative and nonrestrictive, should not limit the scope of the invention with this below.
As shown in Figure 1, a kind of retrievable vena cava filter with good adherent property, comprises the support 1 of the net tubular adopting the braiding of Nickel-titanium alloy for medical purpose silk and the seizure pawl 2 be arranged in support 1 and support bar 3.Support 1 has the sieve bottom 11 of the arc-shaped outwardly formed, catching pawl 2 is that taper is radially formed to 6 Nickel-titanium alloy for medical purpose silks of the oblique extension of periphery by from the vertex of a cone, angle between adjacent nitinol alloy wire is 60 degree, and the vertex of a cone catching pawl 2 is connected with the center of bottom 11.Support bar 3 is also positioned at support 1 central axis place and main support rod 31, the two first branch's struts 32 be connected with the center of bottom 11 and two second branch's struts 33 for Nickel-titanium alloy for medical purpose material comprises one, first branch's strut 32 is by laser weld one end at main support rod 31, second branch's strut 33 is by the other end of laser weld at main support rod 31, and first branch's strut 32 and second branch's strut 33 are all obliquely extended to the outside of support 1 to periphery.The lateral surface center of the bottom 11 of support 1 is also connected with and is provided with recovering hook 5, and recovering hook 5 is set to the shape of barb to avoid scratching blood vessel wall during recycling cavity vein filter.Support 1, catch pawl 2 and support bar 3 by together with laser weld, entangle recovering hook 5 with catcher during recycling cavity vein filter, filter is taken in delivery sheath and takes out.
As shown in Figure 2, the mooring anchor 34 that the free end of first branch's strut 32 and second branch's strut 33 is bent to form arc-shaped makes it be subjected to displacement and to tilt to fix vena cava filter, this free end contacts with blood vessel, and the shape of its smooth arc-shaped can be avoided scratching blood vessel and the shape of arc-shaped is also convenient to fine setting to adapt to vessel diameter.
Obviously; the above embodiment of the present invention is only for example of the present invention is clearly described; and be not the restriction to embodiments of the present invention; for those of ordinary skill in the field; can also make other changes in different forms on the basis of the above description; here cannot give exhaustive to all embodiments, every belong to technical scheme of the present invention the apparent change of extending out or variation be still in the row of protection scope of the present invention.