CN201879866U

CN201879866U - Meshed support used for occluding left auricular appendage

Info

Publication number: CN201879866U
Application number: CN2010206426791U
Authority: CN
Inventors: 王广义; 王梓桐
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-12-06
Filing date: 2010-12-06
Publication date: 2011-06-29
Anticipated expiration: 2020-12-06

Abstract

The utility model relates to a meshed support used for occluding left auricular appendage. The meshed support is characterized by having a structure that a metal wire is repeatedly bent, folded back and woven. The meshed support in a state of free extension appears like a goblet overall and is divided into three parts: a base part, a neck part and a head part, wherein the base part takes the shape of a disc with the concave surface downward, and the diameter of the base part is larger than the opening caliber of the left auricular appendage; the neck part of the support is connected with the base and the head part of the support, being a beam concentration metal wire; the head part of the support is expanded in a short and thick cylinder shape, and the top part is in a flat dome shape; and the head part is in smooth transition with the neck part. The meshed support is more thorough in occluding left auricular appendage.

Description

Mesh support for plugging left auricle

Technical Field

The utility model relates to a medical appliance implanted in human body. In particular to a metal mesh bracket for plugging the inner cavity of the left auricle.

Background

The left atrial appendage is a blind chamber located on the upper side of the left atrium. In persistent atrial fibrillation, blood in the atrial appendage chambers is at near rest and coagulates. Blood clots that fall from the atrial appendage become a thrombus that most easily enters the brain, causing cerebral infarction. In order to avoid thrombosis and escape in the left auricle cavity, modern medicine develops a technology for plugging the auricle cavity by using a mesh support. The metal wire braided mesh stent is called as a plugging umbrella, and the plugging umbrella is sent into and installed in the auricle cavity through a vascular catheter. With the lapse of time, the endocardial cells crawl to cover the metal stent, realize the closure to the auricle cavity. The most used left atrial appendage occlusion umbrellas at home and abroad at present are products of American PLAATO company. The top of the umbrella is in a discus shape, the center of the top of the umbrella is provided with a metal button, and the center of the bottom of the umbrella is provided with an umbrella handle. The metal button on the top of the umbrella and the umbrella handle on the bottom of the umbrella are used for welding the ends of the metal wires. The plugging umbrella is often incomplete and incomplete in plugging the auricle cavity and can cause thrombosis and escape. The plugging umbrella with the structure is unstable and easy to fall off. Sometimes, in order to prevent the blocking umbrella from falling off, a barb is arranged on the bracket to pierce into the wall of the auricle, so that the blocking umbrella is fixed and the auricle is damaged.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a netted metal support for shutoff left auricle, it is high to the shutoff degree in auricle chamber, and is stable, is difficult for droing.

The purpose of the utility model is realized through the following technical measures: a metal wire is used, and is repeatedly bent, folded and woven into a cylindrical net-shaped support, and two ends of the metal wire are concentrated at one end of a cylinder and are mutually welded. The cylindrical metal net support is hot processed by a model and shaped into a required shape.

The utility model discloses a netted support for shutoff left atrial appendage divides into base portion, neck and head triplex like a goblet in the overall outward appearance under the free extension state. After the left atrial appendage is installed on a human body, the base is positioned in the left atrium, the head is positioned in the left atrial appendage cavity, and the neck is positioned at the opening of the left atrial appendage. Wherein, the base part is disc-shaped, the concave surface is downward, the diameter of the base part is larger than the diameter of the cross section of the head part of the bracket, and the diameter of the base part is 2-5 mm larger than the diameter of the left auricle. The larger base part is beneficial to the stability of the bracket placed behind the auricle; the neck part of the stent is connected with the base part and the head part of the stent and is a bundling structure of the metal wires for weaving the reticular stent. The metal wires at the neck are bundled into 1-3 bundles; the head of the bracket is expanded to be in a short and thick cylindrical shape, and the top of the head is in a flat dome shape. The head and the neck are in smooth transition.

Preferably, the side wall of the head part of the bracket is wave-shaped. The wave crests and wave troughs can run longitudinally or transversely. When the wave crests and the wave troughs longitudinally run, the head of the bracket is observed from a transverse section, and the periphery of the head is a wave-shaped curve. When the wave crests and the wave troughs transversely run, the side walls of the head of the bracket are wave-shaped curves when the head of the bracket is observed from the longitudinal section of the head of the bracket. The structure can improve the stability after installation and is not easy to slip.

The utility model is used for the net-shaped support of shutoff left auricle of the heart regulates the density degree of its net with the quantity of the metal wire that its cross section sees. Preferably, the number of the metal wires in the cross section is 80-160.

The metal wires used for weaving the reticular stent of the utility model are preferably nickel-titanium alloy wires with memory function; the diameter of the nickel-titanium memory alloy wire is preferably 0.01-0.3 mm.

The utility model discloses a net support for shutoff left auricle weaves because of using a wire, than the support of current usage of the same kind, has cancelled the metal button on top and the umbrella stick of lower extreme, reduces one from one hundred more with wire end welding point, and the point of turning back of wire is in the free state, has improved the extension elasticity of support greatly, has also improved the overall reliability of support. Will through the operation of cardiac catheter the utility model discloses behind left auricle chamber is placed to the support, support head and base portion fully extend, and auricle intracavity wall is hugged closely to the metal mesh silk of support head, and the support is more docile with auricle intracavity wall's combination, and is more thorough to the shutoff in auricle chamber.

Drawings

Fig. 1-4 are schematic structural views of four embodiments of the mesh stent for plugging left atrial appendage of the present invention. Wherein,

FIG. 1 shows an embodiment of the stent in which the side walls of the head run flat and the neck wires are bundled into a bundle;

FIG. 2 shows the embodiment in which the side walls of the head of the stent run in waves and the wires of the neck are bundled into a bundle;

FIG. 3 shows an embodiment of the stent in which the sidewalls of the head portion run flat and the neck portion wires are bundled into three bundles;

in the embodiment shown in fig. 4, the side wall of the head part of the bracket runs in a wave manner, and the wires at the neck part are bundled into three bundles.

The reference numerals in the drawings denote the following parts: 1-a stand base part; 2-stent neck; 3-a stent head; 5-wavy side wall of the head of the bracket.

Detailed Description

The present invention will be further explained with reference to the drawings and examples.

Taking a nickel-titanium memory alloy wire with the diameter of 0.02 mm, calculating and cutting out a proper length according to the shape and the size of the designed reticular stent, repeatedly turning back and weaving into a cylindrical wire mesh, and finally enabling two free ends of the wire to be concentrated at one end of the cylinder for inosculating and welding. The number of the metal wires is 80-160 when viewed from the cross section of the cylinder.

Then, the cylindrical metal stent is hot-worked (heated to about 1000 ℃) by means of a mold to form the cylindrical metal stent into the shape shown in the drawing. In the freely stretched state, the overall appearance of the support frame is like a goblet, and the support frame is divided into three parts, namely a base part, a neck part and a head part. Wherein, the base part is disc-shaped, the concave surface is downward, the diameter of the base part is 2-5 mm larger than the caliber of the opening of the left auricle and is also larger than the diameter of the cross section of the head part of the bracket; the neck 2 of the support is connected with the base part 3 and the head part 1 of the support, and is in smooth transition with the base part and the head part. The neck 2 of the stent is a bunched structure of metal wires for weaving the mesh stent, and all the metal wires passing through the neck of the stent are bunched into 1-3 bunches. The embodiment shown in fig. 1 and 2 is formed by bundling wires into a bundle that is positioned on the central axis of the stent. The embodiment shown in fig. 3 and 4 bundles the wires into three bundles, which are arranged in a triangular pattern around the central axis. The head 1 of the bracket bulges into a short and thick cylinder shape, the top is in a flat dome shape, and the head and the neck are in smooth transition. The shape of the side wall of the support head 1 may be flat, as shown in fig. 1, 3; the side walls of the stent head 1 may be undulating 5 in shape, as shown in figures 2 and 4.

When the stent is installed, a loop belt is arranged on the stent base part 3, and a traction control rope is connected on the loop belt. Will the utility model discloses support longitudinal stretching makes into a strand of filiform metal, puts heart pipe front end, puts left auricle chamber through heart pipe operation with the support, and support head 1 and base portion 3 fully extend, and auricle intracavity wall is hugged closely to the metal mesh silk of support head 1, and support base portion 3 pastes in left atrium inner wall. If the stent is not properly installed, the control rope can be pulled to pull the stent back into the cardiac catheter for redeployment.

Claims

1. A net-shaped bracket for blocking a left auricle is characterized in that the net-shaped bracket is a metal wire repeatedly bent and folded woven structure, the overall appearance of the net-shaped bracket is like a goblet in a free stretching state, and the net-shaped bracket is divided into a base part, a neck part and a head part; wherein, the base part is disc-shaped, the concave surface is downward, and the diameter of the base part is 2-5 mm larger than the caliber of the left auricle; the neck part of the bracket is connected with the base and the head part of the bracket and is a bunched metal wire; the head of the bracket is expanded into a short and thick cylinder shape, the top of the head is flat and dome-shaped, and the head and the neck are in smooth transition.

2. The mesh stent of claim 1 wherein the stent neck bunched wires are in the range of 1 to 3 bundles.

3. The mesh stent of claim 1 wherein the number of cross-sectional wires is 80 to 160.

4. The mesh stent of any one of claims 1 to 3 wherein the metal wires used to weave the mesh stent are nitinol wires having a memory function.

5. The mesh stent of claim 4, wherein the nitinol wires have a diameter of 0.01-0.3 mm.