WO2008072838A1

WO2008072838A1 - Inserting device of artificial blood stent

Info

Publication number: WO2008072838A1
Application number: PCT/KR2007/005387
Authority: WO
Inventors: Sung-Gwon Kang
Original assignee: S & G Biotech, Inc
Priority date: 2006-12-11
Filing date: 2007-10-30
Publication date: 2008-06-19
Also published as: KR100780318B1

Abstract

The present invention relates to an inserting device of artificial blood stent. The inserting device of artificial blood stent is characterized in that the cylindrical artificial blood stent 1 comprises a body Ia of a hollow cylindrical woven stuff and a cylindrical stent member Ib connected to the bottom end portion of said body Ia, and inverting devices 5 are connected on both sides of one end portion of the body Ia of said cylindrical artificial blood stent, and both distal ends 5a of said inverting device 5 are protruded to one side of the handle 8. According to the present invention, because the stent member Ib of the artificial blood stent is expanded inside the front end portion of the stent body Ia that is inverted while it is coming lastly out of the outer tube 2, it is possible to easily insert and fix the artificial blood stent 1 at the desired location in the blood vessel without being affected by blood pressure, so it has an advantage that the patient does not need to take hypotensive drug before operation. Another advantage is that the operation preparatory work is simplified because the work of tying the artificial blood stent 1 with a separate fixing wire is not necessary.

Description

INSERTING DEVICE OF ARTIFICIAL BLOOD STENT

TECHNICAL FIELD

The present invention relates to an inserting device of artificial blood stent that is inserted into the diseased portion such as blood vessel aneurysm to protect the blood vessel, more specifically to an inserting device of artificial blood stent by which workability for inserting and installing in the diseased portion of blood vessel is easily provided by minimizing the effect of resistance by the flow of blood pressure in the process of inserting and installing artificial blood stent into the blood vessel.

BACKGROUND ART

In general, by ageing or other diseases, aneurysm, in which a part of the blood vessel swells like a balloon, occurs in the blood vessel.

Such aneurysm has a danger that the swollen portion is burst by blood pressure.

For such a case of blood vessel aneurysm, the technique of replacing the portion with artificial blood vessel or the technique of forming bypass is mainly used by surgical operation. But such a technique has a disadvantage in that the diseased portion should be incised, causing a big scar with the operative effect not so significant.

Due to such problems, recently various methods of treatment without surgery are being disclosed, and one of them is artificial blood stent using superelastic shape memory alloy wire.

Such an artificial blood stent 1 has a shape that a hollow cylindrical connector (stent member) is attached to both sides, one side or the inside of a stent body made of woven stuff. The hollow cylindrical connector is manufactured so as to have a plurality of space portions and a given length by weaving superelastic shape memory alloy wire.

Such an artificial blood stent 1 is inserted in the diseased portion inside the blood vessel with its volume contracted as much as possible by a separate inserting device. Next, when this is expanded, it cuts off the aneurysm portion (swollen portion) of the blood vessel while returning to the original state. Therefore, it prevents the danger of being burst by blood pressure.

Normally, in the artificial blood vessel inserting device as shown in Fig. 1, a movable tube 3 with a handle 8 fixed at one end is inserted so as to be moved forward and backward in an outer tube 2 located in front of the connector 7. A guide passing tube 4 for guiding a guide wire is inserted in the movable tube 3. After inserting the cylindrical artificial blood stent 1 between the movable tube 3 and outer tube 2 with its diameter minimized, the movable tube 3 is pushed into the outer tube 2 to insert the stent 1 into the blood vessel.

But in the case of using the conventional device having such a structure, the artificial blood stent 1 is expanded to the original shape by its own elasticity inside the blood vessel at the moment when the artificial blood stent 1 comes out of the inserting device. Because of this, in the case of a patient with a high blood pressure, the artificial blood stent 1 is pushed down in the downward direction of blood vessel by resistance due to the flow of blood. Because of that, a problem arises as it is difficult to install the artificial blood stent 1 accurately at the desired location in the blood vessel.

Because of such problems, the patient had to take hypotensive drug to lower his blood pressure before operation. This causes a problem that medical treatment cost is increased and the risk of medical accident becomes high.

To solve such conventional problems, an artificial blood stent inserting device, in which the rear end of the stent is woven with wire, so in case the installation location of the artificial blood stent is selected incorrectly, the artificial blood stent is pulled together with the inserting tube to return it to the original location again and then the installation location can be reset, is disclosed in Korean Patent Laid-Open No. 2001-18324.

However, the above mentioned stent inserting device has a problem in that it still cannot improve the problem of being pushed out downward of the blood vessel as it is pushed by the flow of blood in the blood vessel because the front end portion of the artificial blood stent that is pushed out from the inserting device is immediately distended and expanded when the artificial blood stent 1 is installed in the blood vessel.

Meanwhile, in order to solve the above mentioned problems, an artificial blood stent inserting device, by which the front end portion of the artificial blood stent 1 is tied by fixing wire supported by iron core, and after positioning the artificial blood stent at the desired location in the blood vessel, the iron core is removed to release the fixing wire wrapping the front end, so as to expand the front end portion of the artificial blood stent, is disclosed in Korean Utility Model Registration No.

20-0312490. But the above mentioned stent inserting device involves complicated preparatory operation work because the front end portion of the artificial blood stent must be tied by fixing wire to make a knot. And when the stent comes out of the outer tube, the front end portion of the stent does not expand immediately but the middle portion and the rear end portion of the stent are distended and expanded immediately by self elasticity.

Because of this, the phenomenon that the stent is pushed down of the blood vessel due to resistance by the flow of blood in the blood vessel still occurs, so there is a problem that it is difficult to install the stent at the desired location in the blood vessel.

Moreover, because in the aforementioned inserting device the middle portion and the rear end portion of the stent that has come out of the outer tube are distended and expanded to be in contact with the wall of the nearby blood vessel even before the iron core is removed, there is a problem that the work of drawing out the artificial blood stent from the outer tube and finding the desired location of the blood vessel to install and fix it, is very difficult.

DETAILED DESCRIPTION OF THE INVENTION (PROBLEM TO BE SOLVED BY THE INVENTION)

Therefore, it is an object of the present invention to provide an inserting device of artificial blood stent that can solve all the conventional

10 problems.

Another object of the present invention is to provide an inserting device of artificial blood stent by which it is possible to easily insert and fix an artificial blood stent at the desired location in the blood vessel without being affected by the blood pressure.

I T) Yet another object of the present invention is to provide an inserting device of artificial blood stent by which the operation preparatory work is simplified because the work of tying the artificial blood stent by fixing wire is not necessary.

Still another object of the present invention is to provide an 0 inserting device of artificial blood stent by which it is possible to easily adjust the installation location of the artificial blood stent 1 in the blood vessel, since the stent member Ib of the artificial blood steni is expanded as it is located at the front end portion of the artificial blood stent that is inverted while it is coming lastly out of the outer tube 2. (TECHNICAL SOLUTION)

To achieve the above objects, there is provided an inserting device of artificial blood stent for blood vessel operation, in which a movable tube 3 with a handle 8 fixed on one end is inserted and installed so as to be moved forward and backward in an outer tube 2 located in front of a connector 7; a guide passing tube 4 for guiding a guide wire is inserted and installed in said movable tube 3; and after inserting an artificial blood stent between said movable tube 3 and outer tube 2 with the diameter of a cylindrical artificial blood stent 1 minimized, said movable tube 3 is pushed into the outer tube 2 to insert and install said stent 1 in the blood vessel, characterized in that: said cylindrical artificial blood stent 1 comprises a body Ia of a hollow cylindrical woven stuff and a cylindrical stent member Ib connected to the bottom end portion of said body Ia, and inverting devices 5 are connected on both sides of one end portion of the body Ia of said cylindrical artificial blood stent, and both distal ends 5a of said inverting device 5 are protruded to one side of the handle 8. (ADVANTAGEOUS EFFECTS) According to the present invention, because the stent member Ib of the artificial blood stent is expanded inside the front end portion of the stent body Ia that is inverted while it is coming lastly out of the outer tube 2, it is possible to easily insert and fix the artificial blood stent 1 at the desired location in the blood vessel without being affected by blood pressure, so it has an advantage that the patient does not need to take hypotensive drug before operation. Another advantage is that the operation preparatory work is simplified because the work of tying the 5 artificial blood stent 1 with a separate fixing wire is not necessary.

BRIEF DESCRIPTION OF THE DRAWINGS

These and other objects, features, aspects, and advantages of preferred embodiments of the present invention will be more fully ] 0 described in the following detailed description, taken in conjunction with the accompanying drawings. In the drawings:

Fig. 1 is a sectional view schematically showing an artificial blood stent 1 of the present invention;

Fig. 2 is an enlarged perspective view partially showing the 1 r> artificial blood stent 1 used in the present invention;

Fig. 3 is a schematic view showing the initial step of inserting the artificial blood stent into the blood vessel using the inserting device of artificial blood stent of the present invention;

Fig. 4 is a schematic view showing the intermediate step of 20 inserting the artificial blood stent into the blood vessel using the inserting device of artificial blood stent of the present invention;

Fig. 5 is a schematic view showing the final step of inserting the artificial blood stent into the blood vessel using the inserting device of artificial blood stent of the present invention; and

Fig. 6 is a sectional view schematically showing the state of the artificial blood stent inserted in the blood vessel using the inserting device of artificial blood stent of the present invention. [Description of symbols for major parts in drawings]

1 : artificial blood stent 2: outer tube

3: movable tube 4: guide passing tube

4a: inserting tip 5: inverting device

5a: both distal ends of inverting device 6: inverting device insert hole 7: connector

8: handle 9: blood vessel

BEST MODE FOR CARRYING OUT THE INVENTION

Below will be described in del ail an inserting device of artificial blood stent according to a preferred embodiment of the present invention with reference to the accompanying drawings.

Fig. 1 is a sectional view schematically showing an artificial blood stent 1 of the present invention.

First, as shown in Fig. 1, in the inserting device of artificial blood stent, a movable tube 3 with a handle 8 fixed at one end is inserted so as to be moved forward and backward in an outer tube 2 located in front of the connector 7. A guide passing tube 4 for guiding a guide wire is inserted in the movable tube 3. After inserting the cylindrical artificial blood stent 1 between the movable tube 3 and outer tube 2 with its diameter minimized, the movable tube 3 is pushed into the outer tube 2 to insert the stent 1 into the blood vessel.

The artificial blood stent 1 used in the present invention comprises a stent body Ia made of a hollow cylindrical woven stuff and a cylindrical stent member Ib attached to the lower portion of the body Ia.

The stent member Ib has a hollow shape and is made by weaving metal wire or cutting a cylindrical metal tube by laser.

Fig. 2 is an enlarged perspective view partially showing the artificial blood stent 1 used in the present invention and shows the shape of the artificial blood stent which is not inserted into the blood vessel.

As shown in Fig. 1 and Fig. 2, inverting devices 5 are connected on both sides of the top end portion of the body Ia of the artificial blood stent. Both distal ends 5a of the inverting device 5 are passed through an inverting device insert hole 6, and protruded to one side of the handle 8.

The inverting device 5 is made of metal wire or thread.

At the front end of the guide passing tube 4 is formed an inserting tip 4a.

The stent body Ia of artificial blood stent is made of material such as high-density woven stuff.

Next will be described the method of using the inserting device of artificial blood stent of the present invention.

First, select an artificial blood stent 1 of a proper size that matches the length of the diseased portion such as blood vessel aneurysm.

Next, insert the artificial blood stent 1 into the guide passing tube 4, and then reduce its diameter. Subsequently, draw out the movable tube 3 from the outer tube 2 and insert the artificial blood stent 1 that is reduced as mentioned above into the outer tube 2 to position it. When the work of inserting the artificial blood stent 1 into the inserting device is completed, insert the outer tube 2 as far as the front of the diseased portion in the blood vessel by angiography to position it.

While holding the handle 8 in this condition, draw out the outer tube 2 together with the connector 7. In other words, as the movable tube 3 is pushed into the outer tube 2, the artificial blood stent 1 inserted into the outer tube 2 is pushed slowly out of the outer tube 2.

At the same time, firmly hold both distal ends 5a of the inverting device 5 protruded to one side of the handle 8. At this time, by the inverting devices 5 fixed on both sides of one end portion of the body Ia of the artificial blood stent 1 , fix the front end portion of the stent body Ia. Accordingly, as shown in Fig. 3 to Fig. 5, as the body Ia of the artificial blood stent 1 that is pushed out of the outer tube 2 is inverted , the outer surface of the body Ia becomes the inner surface. Continuously, if the artificial blood stent 1 is pushed out of the outer tube 2, it goes through the steps as in Fig. 4 and Fig. 5, and as the member Ib of the artificial blood stent 1 comes lastly out of the outer- tube 2, the front portion of the body I a of the inverted artificial blood stent 1 is expanded, so that the artificial blood stent is installed in the blood vessel 9, as shown in Fig. 6. The body Ia of the artificial blood stent inserted into the blood vessel is inverted as shown in Fig. 6, and its stent member Ib is expanded while positioned inside the front end portion of o the inverted body Ia, so that it comes into close contact with the blood vessel wall.

Fig. 3 to Fig. 5 are schematic views showing the initial step, intermediate step and final step of inserting the artificial blood stent into the blood vessel, and Fig. 6 is a sectional view schematically showing the

10 state of the artificial blood stent inserted in the blood vessel using the inserting device of artificial blood stent of the present invention.

Next, by pulling the strands of the distal ends 5a of the inverting device protruded to one side of the handle 8 one by one, it is possible to remove from the stent 1 the inverting device 5 connected in loop shape to i T) the top end portion of the artificial blood stent body Ia. As necessary, it is also possible to additionally insert and install a separate auxiliary member into the body Ia of the artificial blood stent.

INDUSTRIAL APPLICABILITY

20 As described above, the present invention is used to treat blood vessel aneurysm without surgical operation.

Although the present invention has been described in connection with the exemplary embodiments illustrated in the drawings, it is only illustrative. It will be understood by those skilled in the art that various modifications and equivalents can be made to the present invention. Therefore, the true technical scope of the present invention should be defined by the appended claims.

Claims

WHAT IS CLAIMED IS:

1. An inserting device of artificial blood stent for blood vessel operation, in which a movable tube 3 with a handle 8 fixed on one end is F> inserted and installed so as to be moved forward and backward in an outer tube 2 located in front of a connector 7; a guide passing tube 4 for guiding a guide wire is inserted and installed in said movable tube 3; and after inserting an artificial blood stent between said movable tube 3 and outer tube 2 with the diameter of a cylindrical artificial blood stent 1

I t) minimized, said movable tube 3 is pushed into the outer tube 2 to insert and install said stent 1 in the blood vessel, characterized in that: said cylindrical artificial blood stent 1 comprises a body Ia of a hollow cylindrical woven stuff and a cylindrical stent member I b connected to the bottom end portion of said body Ia, and

1 T) inverting devices 5 are connected on both sides of one end portion of the body Ia of said cylindrical artificial blood stent, and both distal ends 5a of said inverting device 5 are protruded to one side of the handle 8.