CN2577879Y

CN2577879Y - Net-like stents for blocking cardiopathic atrial septal defect

Info

Publication number: CN2577879Y
Application number: CN 02281643
Authority: CN
Inventors: 王广义; 王梓桐; 王爱香
Original assignee: 王广义
Current assignee: WANG GUANGYI
Priority date: 2002-10-15
Filing date: 2002-10-15
Publication date: 2003-10-08
Anticipated expiration: 2012-10-15

Abstract

The utility model relates to a metal mesh stent which is used for blocking atrial septal defect in congenital heart disease. The utility model uses a memory alloy wire, and the memory alloy wire is woven into a straight tubular shape by repeated folding according to designed length. Then the memory alloy wire is made into a plugging umbrella, and the shape of a top cover of the plugging umbrella is like a disk 2 and a disk 4. The concave surfaces of the two disks correspond to each other, and the convex surfaces face oppositely. A metal button (5) is arranged on a central part of one side of the metal mesh stent, and the metal button (5) is fixedly connected with two end heads of a metal wire and all folding points. The folding points of the free metal wire are positioned on the central part of the other side.

Description

The network that is used for the shutoff heart atrial septal defect

(1) technical field

This utility model belongs to the medical apparatus and instruments in the implant into body.Specifically, be used for the shutoff congenital heart disease exactly, the metal net shaped support of atrial septal defect.

(2) background technology

The heart atrial septal defect generally is congenital generation, and traditional Therapeutic Method is a surgical repair.Occurred nonoperative Therapeutic Method in recent years, promptly inserted conduit, heart atrial septal defect place has been sent into and be installed in to a metal endoplasmic reticular support that is called as " shutoff umbrella ", realized sealing atrial septal defect by blood vessel.What use both at home and abroad was maximum at present is the double plate dispireme shutoff umbrella (Fig. 1) that American AGA company produces.This metal net shaped support uses the metal wire knitted with memorial alloy characteristic to form.The umbrella of the similar bi-layer tip cap of profile, short handle during free extended configuration.Because each of umbrella layer top cover be dish shape and for example, so also it is called dish.As shown in Figure 1, several positions of shutoff umbrella are called front end metal button (1) respectively, claim deep bid (2), the waist (3) of support, shallow bid (4), rear end metal button (5).The shutoff umbrella becomes a thread wire-shaped through tractive, the cardiac catheter of packing into (apparatus of operation usefulness).Lay put in place after, support stretches, two dishes lay respectively at the both sides of interatrial septum, and lumbar support plays atrial septal defect, two dish inner faces and waist are implanted poor polyester flake respectively and are intercepted blood flow, promote fibrin deposition and endotheliocyte to grow into, and reach the purpose of repairing the interatrial septum.This net metal support is when suitability for industrialized production, and it is to be woven into long tube with some one metal wires earlier, and barrel is a network structure.As required from the certain length of tube intercepting, be thermally processed into the support of required form more then.The support of making like this, just respectively there are 72 metal terminations at its two ends when using 72 one metal wires.Respectively welding a metal button in each side centre of support again fixes 72 metal joints.This button is actually a cylindrical metal body, is also referred to as the umbrella handle of shutoff umbrella.The support of this two ends band metal button, the metal button of its rear end is absolutely necessary, and when being used for being placed in cardiac catheter, is connected with parts such as connecting rod in the conduit, makes to push with put procedure can stablize, accurately.The metal button of front end has then been given more than the operating process a heavy obstacle, has also weakened the flexible degree of freedom and the elasticity of wire netting.And good flexible freedom and the elasticity of network is settled carrying out smoothly of operation and lays the back correction function reliably necessary to assurance.

(3) summary of the invention

The purpose of this utility model be to provide a kind of with flexible degree of freedom height, to bend and stretch good springiness be technical foundation, is used for the net metal support of shutoff heart atrial septal defect.Its technical characterstic makes the placement operation more stable, accurate, settles the respond well of back shutoff atrial septal defect.

The purpose of this utility model realizes by following technical measures:

Use a memory alloy wire, by the length of design, turning back repeatedly is woven into straight-tube shape.See that from the cross section of tube quantity wiry is 60～80.Two terminations wiry concentrate on an end of tube, mutually welding.To the wire braid of tubular, carry out hot-working by model, become the support of required form.Like a short handle umbrella, the top cover of umbrella is double-deck to this utility model support under free extended configuration, and each layer top cover be a dish and for example, and the concave surface of two plates is relative, and the bottom surface of projection is from (Fig. 2).The diameter of plate is between 15 millimeters to 70 millimeters.Two dish diameters can equate, also can not wait.The intermediate location of two dishes claims waist, 2 millimeters to 55 millimeters of the diameters of waist.The central part of two plates is that tinsel is turned back and a little assembled the place.At a side central part of support, the bottom centre position of carrying a tray after is promptly turned back all tinsels with welding or bonding or riveted way and a little to be fixed on the metal button (or umbrella handle of title shutoff umbrella), just becomes a finished product shutoff umbrella.At the opposite side central part of support, the bottom centre position of promptly before carrying a tray, each tinsel are turned back and a little all are in free state.

Preferred scheme weaves for selecting the Ultimum Ti silk for use, and diameter wiry is 0.01～0.3 millimeter.Two after the molding coil small one and large one, and diameter does not wait, and the two differs 2～5 millimeters.Two terminations wiry are in shallow bid one side; At the centre of shallow bid weld metal button.Used metal button is selected rustless steel or titanium alloy material for use.

Summarize technical characterstic of the present utility model, can be described as the double plate list button shutoff umbrella of monofilament braiding.

The heart atrial septum shutoff umbrella of making by this utility model has outstanding performance characteristics: 1. use an one metal wire to weave, the pad of tinsel termination is reduced to one from seventy or eighty, improved the global reliability of support greatly and stretched elasticity; 2. saved a vertical metal button, wiry turning back a little is in free state, improved the elasticity of support to planar extension, reduced the entad outstanding shortcoming of intracavity, reduced thrombotic chance, also make in the conductive pipe lay and more convenient to the release of the chambers of the heart, the probability minimizing that hinders, blocks.

(4) description of drawings

Fig. 1 is the front view of commercially available double plate dispireme shutoff umbrella.

Fig. 2 is a front view of the present utility model.

Fig. 3 is a top view of the present utility model.

Be denoted as (1) front end metal button among the figure.This button exists on the represented commercially available double plate dispireme shutoff umbrella of Fig. 1, and this button does not exist on the represented this utility model double plate list button shutoff umbrella of Fig. 2; (2) front portion of support claims deep bid; (3) waist of support; (4) rear portion of support claims shallow bid; (5) rear end metal button; (6) this utility model central part tinsel of trying to get to the heart of a matter is greatly turned back and is a little assembled the place.

(5) specific embodiment

The utility model is described in further detail below in conjunction with drawings and Examples.

Adopt 0.02 millimeter Ultimum Ti silk of a diameter, turning back repeatedly is woven into the straight-tube shape metal gauze, makes two free terminations wiry concentrate on an end of tube at last.This end is removed outside two free terminations wiry, also has 35 to turn back a little, be after weld metal button (5) locate.The other end of tube then has 36 tinsels to turn back a little, is called front end, is formation place of the big dish of double disk structure.See that from the cross section of tube quantity wiry is 72.Whenever the tinsel length between former and later two turn back a little is 10 centimetres.By model, through hot-working (being heated to about 1000 ℃), originally the metal gauze of straight-tube shape becomes double plate shape (Fig. 2) afterwards, omits tool " W " shape, and the concave surfaces of two dishes are relative.40 millimeters of preceding end plate (2) diameters, 36 millimeters of back end plate (4) diameters, 20 millimeters of waist (3) diameters.Select 2.2 millimeters of diameters else, 5 millimeters stainless steel tubes of length (5), an end and two free terminations wiry and 35 means of spot welds of turning back are fixed, and other end inwall is carved with screw thread, is used for being connected with the connecting rod of conduit.The central part of trying to get to the heart of a matter greatly is that tinsel is turned back and a little assembled place (6), and each is turned back and a little all is in free state.Making like this is one and is applicable to shutoff heart atrial septal defect, the monofilament braiding, double plate list button shutoff umbrella.

Claims

1. metal net shaped support of double plate that is applicable to the shutoff heart atrial septal defect, it is the shutoff umbrella, it is characterized in that, it is turned back repeatedly by an one metal wire and is woven into, at the central part of a dish one metal button is installed, a little being connected to a fixed with two terminations wiry and turning back, then is that free tinsel is turned back and a little assembled mutually at the central part of another dish.

2. the metal net shaped support of double plate according to claim 1 is characterized in that, the tinsel that is used to weave is the Ultimum Ti silk of 0.01～0.3 millimeter of diameter.

3. the metal net shaped support of double plate according to claim 1 is characterized in that, sees that from the cross section of support quantity wiry is 60～80.

4. the metal net shaped support of double plate according to claim 1 is characterized in that, the dish of two after molding diameter is respectively 15～70 millimeters, 2～55 millimeters of waist diameters.

5. the metal net shaped support of double plate according to claim 1 is characterized in that, the dish of two after molding diameter does not wait, and differs 2～5 millimeters,

6. the metal net shaped support of double plate according to claim 1 is characterized in that, metal button and combination wiry are one of welding, bonding, three kinds of modes of riveted joint.