CN102160826A

CN102160826A - Vena cava filter

Info

Publication number: CN102160826A
Application number: CN2011101211646A
Authority: CN
Inventors: 陈增胜; 邓小燕; 樊瑜波
Original assignee: Beihang University
Current assignee: Beihang University
Priority date: 2011-05-11
Filing date: 2011-05-11
Publication date: 2011-08-24

Abstract

The invention discloses a vena cava filter, which is characterized in that: a support leg reverse hooking tail of the filter is made of a degradable material; and when the filter is recovered, a main body part of the filter for collecting thrombus is only recovered and the support leg reverse hooking tail is remained in vivo to be degraded. In the figure, the filter consists of two parts, namely a support leg A and a support leg connecting rod B, wherein A consists of three parts, namely A1, A2 and A3; the A1 part is a long rod, and the tail end of the A1 part is provided with six reverse hooking legs; the A2 part is a sleeve made of a degradable material and is mainly used for connecting A1 and A3; and the A3 part belongs to a filter tail support leg, is contacted with a blood vessel of vena cava, and is made of a degradable material. After the vena cava filter is implanted in vivo for a period of time, when the vena cava filter is needed to be recovered, the main body part of the filter for capturing the thrombus can be only taken out and the filter tail reverse hooking leg part is remained in vivo to be degraded. The method effectively solves the problem that the blood vessel of the vena cava is injured when the traditional filter is taken out to be recovered.

Description

A kind of vena cava filter

Technical field

The present invention relates to a kind of cardiovascular intervention apparatus, more particularly, it is a kind of recyclable and terminal degradable vena cava filter, just after filter is inserted blood vessel, be supported on feet on the blood vessel and be with degradable material and make and can be with the isolating vena cava filter of filter main part (as shown in Figure 1).

Background technology

Vena cava filter is to be used for stoping the dark vein of patient place thrombosis to be back to a kind of intervention apparatus of pulmonary, and it can effectively prevent the generation of pulmonary embolism.After vena cava filter was inserted blood vessel, the thrombosis that is deposited on the filter can get more and more, and causes venacaval obstruction, and the blood heart that can't reflux must undergo surgery at last filter is taken out.After but vena cava filter is inserted blood vessel for a long time, the feet of filter can be sticked together with blood vessel endothelium because of thrombosis and stimulating endothelial cell migration, cause filter be difficult to take out, promptly allowing to take out also can injured blood vessel, and then causes serious thrombus disease.Though vena cava filter has developed into and can send into blood vessel and callable Wicresoft stage by seal wire now, still is faced with filter feet and blood vessel adhesion together, causes the problem of injured blood vessel when taking out.If can design a kind of vena cava filter, its feet is to make with degradable material, and feet can separate with the filter main part, so when reclaiming filter, just can very easily the filter main part be taken out, then stay the degraded of vein the inside by the feet that degradation material is made, this just can solve because of taking out the blood vessel injury problem that filter causes.

Summary of the invention

The objective of the invention is at reclaiming the problem that causes blood vessel injury because of vena cava filter at present, designed a kind of new recyclable and terminal degradable vena cava filter, it contacts feet with blood vessel be to be made by degradation material, and this feet can separate with the main part that filter is caught thrombosis, thereby solves the blood vessel injury problem that causes because of the vena cava filter recovery.

Concrete scheme of the present invention is a kind of recyclable and terminal degradable vena cava filter (as shown in Figure 1).It is characterized in that the end support foot of this vena cava filter and blood vessel contact portion is to be made by degradation material, and this feet can separate with the main part that filter is caught thrombosis.

Adopt vena cava filter of the present invention to insert caval vein when needing to take out after a period of time, the feet that main part can be under the external broach effect of reclaiming seal wire with degradation material is made that filter is caught thrombosis partly separates, main part is recycled to external, feet then stays in the body, gradually by the human body degraded and absorbed, take out the problem that causes blood vessel injury thereby solve because of vena cava filter.

Description of drawings

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

Fig. 2 is the details drawing of A part among Fig. 1 of the present invention;

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

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

Fig. 5 is a upward view of the present invention;

Among Fig. 1: all parts all are made up of the filament with certain diameter, and all filament diameters are all identical, all at 0.5mm between the 1.5mm.Wherein A partly is one of eight identical feets forming this vena cava filter, by A1, and A2, A3 three parts are formed, and concrete structure is as shown in Figure 2.An end that belongs to the A1 part in eight feets of A part is bonded together, and the feet that belongs to A3 part one end then struts, similar cone shape.Wherein in 8 feet the ultimate range between two symmetrical feet at 20mm between the 30mm.B partly is the connecting rod that connects adjacent two feet in eight feets of A part, the connecting rod length range at 10mm between the 20mm.One has eight identical connecting rods in this filter, is circumference and is symmetrically distributed./ 2nd of one from a left side feet A1 part of B part connecting rod is connected to the junction of feet A1 in the right and A2, the just end of A1.

Among Fig. 2: A part is by A1, A2, three parts of A3 are formed, wherein A1 is long stock for L (scope at 10mm between the 40mm), diameter at 1mm between the 1.5mm.Its end has a little quarter butt, its diameter at 0.6mm between the 1mm, length at 1mm between the 4mm.End at quarter butt has six anti-hooks, and their diameter between the 0.3mm, is used for being connected and fixed A1 and A2 at 0.1mm when support struts; And support is when reclaiming, and six anti-feet that collude can draw in and extract out from A2.A2 is the hollow circuit cylinder of being made by degradation material, and internal diameter between the 2mm, can entangle and connect A1 and A3 at 1mm.The snap ring that a toroidal is arranged in A2 bosom position, internal diameter at 0.6mm between the 1mm.This snap ring can block six anti-hooks of A1 distal portion when filter struts, and makes things convenient for A1 to withdraw from when filter reclaims.A3 partly is the anti-feet of being made by degradation material that colludes of A end, and an end is connected with A2, and an end contacts with the caval vein endothelium.After filter reclaims, then stay in the caval vein by A3 and A2 part that degradation material is made, by the health degraded and absorbed.

The specific embodiment

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

As Fig. 1, Fig. 2, Fig. 3, Fig. 4, shown in Figure 5: the present invention mainly is by A, the similar coniform filter that two parts of B are formed.A part is specifically by A1, A2, and three parts of A3 are formed, A2 wherein, A3 is made by degradation material, and they all stay in the body when filter reclaims, by the health degraded and absorbed.This vena cava filter can guide by seal wire, enters into caval vein in the mode of Wicresoft.When placement after a while need be reclaimed, A1 partly is subjected to reclaiming the outside pulling force of seal wire, its terminal 6 anti-hooks draw in, A1 and A2 are partly broken away from, the main part that filter is caught thrombosis reclaims away with the thrombosis that is captured, and the feet of filter (just A2 among the A and A3 part) then stays in the body.Because A2 and A3 part all are to be made by degradation material, they stay in the body will be by the health degraded and absorbed.This invention can solve because of filter reclaims the problem that the caval vein blood vessel is caused damage, has very high clinical application and is worth.

Claims

1. a vena cava filter is characterized in that, the filter feet end that contacts with the caval vein blood vessel in this filter is to be made by degradation material, can be by the health degraded and absorbed.

2. a kind of vena cava filter according to claim 1 is characterized in that, this filter is the vena cava filter of being made jointly by the metal that can insert human body and degradation material, and the degradable part is easily separated with the metal part partial volume.

3. a kind of vena cava filter according to claim 1, it is characterized in that, this filter is when reclaiming taking-up, catching the main part of thrombosis will separate with filter feet end, main part is removed, the terminal anti-hook part of being made by degradation material of filter then stays in the body, by the health degraded and absorbed.