CN102160825A

CN102160825A - Vena cava filter

Info

Publication number: CN102160825A
Application number: CN201110113707XA
Authority: CN
Inventors: 陈增胜; 邓小燕; 樊瑜波
Original assignee: Beihang University
Current assignee: Beihang University
Priority date: 2011-05-04
Filing date: 2011-05-04
Publication date: 2011-08-24

Abstract

The invention provides a vena cava filter which is characterized in that the arrangement direction of the vena cava filter is opposite to the arrangement direction of a traditional vena cava filter; and the position for collecting thrombi by using the vena cava filter provided by the invention is different from the position for collecting thrombi by using the traditional vena cava filter, wherein the thrombi are collected in a low-shear-force pointed region near the central axis of the vena cava vessel by using the traditional vena cava filter, and the thrombi are collected in a high-shear-force annular region close to the wall surface of the vena cava vessel by using the vena cava filter provided by the invention. As shown in the specification, the filter comprises seven parts including A, B1B2, C, D, E, F1F2 and G, the filter is similar to an umbrella shape or a cone shape, and all parts are composed of filaments the diameters of which are 0.5-1mm. By adopting the filter and scheme provided by the invention, the shear force acting on the thrombi captured by the vena cava filter can be improved, and the dissolution rate of the captured thrombi can be increased, thereby effectively lowering the probability of occurrence of a clogging event of the vena cava filter, and prolonging the service time of the vena cava filter. Thus, the vena cava filter provided by the invention has an important clinical application value.

Description

A kind of vena cava filter

Technical field

The present invention relates to a kind of cardiovascular intervention apparatus, more particularly, is a kind of placement direction a kind of novel vena cava filter (as shown in Figure 6) opposite with traditional vena cava filter placement direction.

Background technology

Vena cava filter is that it can play the effect that effective prevention pulmonary embolism takes place be used to the thrombus inflow heart and a kind of intervention apparatus of lung that prevent that the dark vein of patient body place from forming.After but vena cava filter is inserted, along with the thrombosis of catching is more and more, tend to stop up filter, thereby cause whole venacaval obstruction, venous blood cannot pass back into heart, thereby must undergo surgery filter is taken out, and inserts new filter more again.Though vena cava filter has developed into the second filial generation at present, have and can by seal wire filter be sent into caval vein, and it be reclaimed with the mode of Wicresoft with seal wire, the problem that vena cava filter is blocked by thrombosis also is not resolved always.Research is found because the thrombolysis speed that is caught by vena cave catches the speed of new thrombus less than vena cave, so the thrombus that is deposited on the vena cava filter can get more and more, thereby result in blockage.According to hage oiseuillelaw (Hagen-Poiseuille), fluid flows a pipe the inside, shearing force is in zone, axis minimum and in pipe wall position maximum, and our position of traditional vena cava filter collection thrombosis is to be positioned at zone, the endovascular axis of caval vein, so the shearing force that the thrombosis of collecting is subjected to is little, be difficult to dissolving, and the position of adding traditional vena cava filter collection thrombosis generally is the radius area of taper, the thrombosis of collecting just more indissoluble separate, very easy on the contrary accumulation is so clogging often takes place.If can design a kind of placement direction vena cava filter opposite with traditional vena cava filter placement direction, make the zone of thrombus assembling position from original axis zone-transfer to close wall on the filter, can strengthen so the suffered shearing force of the thrombus that is captured, simultaneously thrombus is disperseed to be collected in venacaval around, be difficult to pile up and stop up, and guaranteed the exploitation of vena cave central passage.

Summary of the invention

The objective of the invention is to insert the rear problem of being stopped up by thrombus for present vena cava filter, designed a kind of placement direction new filter opposite with traditional filter placement direction.This new filter is compared with the filter that uses clinically at present, has the high shear force zone that thrombosis can be disperseed to be collected near the vein blood vessel tube wall, thereby helps quickening to catch thromboembolism, prevents the advantage that the vena cava filter thromboembolism takes place.

Concrete scheme of the present invention is a kind of novel vena cava filter (as shown in Figure 6) that a kind of placement direction is opposite with traditional vena cava filter placement direction.It is characterized in that, this filter placement direction is opposite with traditional vena cava filter placement direction, and the position of collecting thrombosis is different from traditional vena cava filter thrombosis is collected near the low-shearing force wedge angle zone caval vein axis, but is positioned at the circular annular region near the high shear force of caval vein tube wall.

Adopt such scheme can improve vena cava filter and catch the suffered shearing force of thrombus, accelerate to catch the dissolving of thrombus, thereby effectively reduce the probability of happening that vena cava filter stops up, prolong the service time of vena cava filter.

Description of drawings

Fig. 1 is a three-dimensional view of the present invention;

Fig. 2 is a front view of the present invention;

Fig. 3 is a vertical view of the present invention;

Fig. 4 is a upward view of the present invention;

Fig. 5 is A part schematic diagram among the figure of the present invention;

Fig. 6 is that filter of the present invention is placed (figure below) and traditional filter are placed (upper figure) in vena cave contrast simplified schematic diagram in vena cave

Among Fig. 1: all parts all are made up of the filament with certain diameter, and all filament diameters all are identical, all at 0.5mm between the 1mm.Wherein A partly is one of eight identical pin that form " umbrella " shape conical cavity venous filter, concrete structure as shown in Figure 5, it is that the essentially continuous fine thread of L (scope at 20mm to the 40mm) and radius are that semicircle filament and the long short filament for l (scope at 2mm to the 5mm) of r (scope at 2mm to the 3mm) forms by length, filamented diameter d all at 0.5mm between the 1mm; B ₁B ₂Part is the filament connecting rod that connects adjacent two pin in eight pin of A part, and one has eight pairs of identical filament connecting rods, and it is symmetrical to be circumference, B ₁The L 1/2nd of a pin links the L of the pin in adjacent the right near 3/4ths places, bottom, B from the left side ₂Be right after B ₁The L of a pin links the L bottom of the pin in the adjacent left side near bottom 3/4ths from the right; C partly is an annulus that is made up of filament that is positioned at A partial L bottom, all intersect bottom the L of annulus and 8 pin of A part, its diameter at 12mm between the 14mm; D partly be with C part annulus at conplane annulus, and intersect at the intersection point place of the short filament l of A department and semicircle r with eight pin of A part, D part circle diameter is that 16mm is between the 20mm; E partly is the annulus that is positioned at whole vena cava filter bottommost, intersects at place, semicircle summit with eight semicircle l of A part, circle diameter at 14mm between the 16mm.

Among Fig. 2: A, B ₁B ₂, C, D, E part all with Fig. 1 in explain the situation identical; F ₁F ₂Part is to connect D, the connecting rod of two annulus of E, and one has eight pairs of identical annulus connecting rods, and it is symmetrical to be circumference, wherein F ₁Originate in the A part on the left side and the junction of annulus D, be connected to above the E annulus centre position of E annulus and two adjacent pin intersection points of A part, and F ₂Originate in the A part on the right and the junction of annulus D, be connected to above the E annulus, the centre position of E annulus and two adjacent pin intersection points of A part, and at this position and F ₁Link to each other F ₁F ₂Length all at 9mm between the 11mm.

Among Fig. 3: A, B ₁B ₂, C, D, E, F ₁F ₂Equal and the Fig. 1 of part, explaining the situation among Fig. 2 is identical.

Among Fig. 4: A, B ₁B ₂, C, D, E, F ₁F ₂Equal and the Fig. 1 of part, Fig. 2, explaining the situation among Fig. 3 is identical; G connects C, the straight-bar filament of two annulus parts of E, one has eight identical straight-bar filaments, it is symmetrical to be circumference, this straight-bar filament originates in above the C annulus, and the intersection point centre position of eight adjacent two pin of pin of C annulus and A part ends at above the E annulus, the intersection point centre position of eight adjacent two pin of pin of E annulus and A part, the length of straight-bar filament at 1.5mm between the 2mm.

Among Fig. 5: mainly be A part schematic diagram among the figure of the present invention, it by length be the essentially continuous fine thread of L (scope at 20mm to the 40mm) and radius be r (scope at 2mm to the 3mm) the semicircle filament and long for l (scope at 2mm to the 5mm) short filament altogether three parts form, it is all tangent with semicircle r and meet at respectively two end points of half circular diameter that wherein essentially continuous fine thread L lacks filament l.

Among Fig. 6: top figure represents that traditional filter is placed on the sketch map in the caval vein, and its position of collecting thrombosis is positioned at the axis position of traditional filter wedge angle near the caval vein blood vessel; Figure below is represented the placement sketch map of filter in caval vein among the present invention, and its position of collecting thrombosis is positioned at the circle ring area position of caval vein near blood vessel wall.In the figure, the blood circulation direction in the vena cave all is from left to right.

The specific embodiment

Below in conjunction with the accompanying drawing and the specific embodiment the present invention is described in further detail:

Such as Fig. 1, Fig. 2, Fig. 3, shown in Figure 4: the present invention mainly is by A, B ₁B ₂, C, D, E, F ₁F ₂, G is seven similar " umbrella " shape or cone shape vena cava filters that part forms altogether.The composition structure of concrete each part is existing detailed description the in detail in description of drawings.In clinical practice, this vena cava filter placement direction is opposite with traditional vena cava filter placement direction, and the position of collecting thrombus is different from traditional vena cava filter and collects the place that the position of thrombus is positioned at the low-shearing force of close vena cave blood vessel axis, but with thrombus be collected in be positioned near the annulus position of vena cave blood vessel wall (such as Fig. 1, Fig. 2, Fig. 3, anti-zone and the C of colluding of the annular of every the foot bottom of A part among Fig. 4, D, F is added in the zone between the annulus of E ₁F ₂The connecting rod region of G part), the shearing force that the thrombus that is captured in this position is subjected to is big, and catching thrombus is scattered on the whole annulus, therefore thrombus dissolves easily, can effectively reduce vena cava filter and stop up the probability that takes place, prolong the service time of vena cava filter, therefore have important clinical value.

Claims

1. a vena cava filter is characterized in that, this filter is similar " umbrella " type device, and " umbrella " type open bottom is one and has semicircle anti-device and three and the anti-thrombosis collecting zone that colludes crossing annulus and the composition of the connecting rod between the annulus of colluding.

2. a kind of vena cava filter according to claim 1, it is characterized in that, this filter placement direction is opposite with traditional vena cava filter placement direction, and the position of collecting thrombosis is different from traditional vena cava filter thrombosis is collected near the low-shearing force wedge angle zone caval vein axis, but thrombosis is collected in the circular annular region that is positioned near the high shear force of caval vein tube wall.

3. a kind of vena cava filter according to claim 1 is characterized in that, after this filter was inserted in the body, blood passed through from the conical tip area at filter top, and corresponding thrombus is trapped in counter the colluding of this filter bottom, annulus, and connecting rods etc. are encrypted the zone.