KR102566537B1 - Catheter for cerebro angiography - Google Patents

Abstract

The present invention relates to a cerebral angiography catheter, which is used for cerebral angiography, which has a cylindrical shape extending in a longitudinal direction, and has an external catheter having a receiving portion made of a hollow longitudinal direction therein; an inner catheter coaxially coupled to the outer catheter through the receiving portion and having a longitudinal hole; and a wire penetrating the internal catheter through the hole and entering the cerebral blood vessel to control the direction of the catheter.

Description

Cerebrovascular angiography catheter {CATHETER FOR CEREBRO ANGIOGRAPHY}

The present invention relates to a catheter for cerebral angiography, and more particularly, to a catheter for cerebral angiography that can be used for a blood vessel formed in a sharp curve through a change in the material and structure of the catheter.

In general, with the development of non-invasive vascular tests such as CT angiography or MR angiography, many cerebrovascular diseases have been discovered, and accordingly, cerebrovascular interventional procedures are rapidly increasing. Unlike craniotomy, which requires opening the head, interventional surgery is preferred by patients because it has the advantages of pain-free after the procedure, less bleeding, and shorter hospital stay.

The diseases targeted for interventional procedures include carotid artery stenosis, cerebral aneurysm, and cerebral arteriovenous malformation.

For such an interventional procedure, a process of selecting a blood vessel going from an artery to the brain and inserting a catheter is required.

This process is performed by an interventionist in an angiosuit equipped with an angiography device, injecting a contrast medium and viewing the blood vessels through X-rays.

On the other hand, cerebrovascular angiography is the most precise test among tests for observing cerebral blood vessels in order to diagnose cerebrovascular diseases.

More specifically, in cerebral angiography, a catheter is placed in the carotid artery or vertebral artery, which is an artery leading to the brain, and then a contrast agent is injected and the moment is photographed to determine the shape of the cerebrovascular vessel and the condition of the disease.

For this purpose, various types of diagnostic catheters are commercialized and used, and a catheter suitable for the shape of a patient's blood vessel is selected and used during a cerebral angiography test.

However, depending on the shape of the patient's cerebral blood vessels, there are cases where examinations and procedures are possible. There are difficult cases.

As a prior art, Korean Patent Publication No. 10-2-21-0005948 (title of invention: balloon catheter) has been disclosed.

In order to solve the above problems, the present invention relates to a cerebrovascular angiography catheter, and is intended to provide a cerebrovascular angiography catheter that can be applied regardless of the shape of a blood vessel by changing the material and structure of an existing catheter.

In order to solve the above problems, a cerebrovascular angiography catheter according to an embodiment of the present invention is a cerebrovascular angiography catheter used for cerebral angiography, has a cylindrical shape extending in the longitudinal direction, and has a hollow longitudinal direction on the inside. An external catheter having a receiving portion made of; an inner catheter coaxially coupled to the outer catheter through the receiving portion and having a longitudinal hole; and a wire passing through the inner catheter through the hole and entering the cerebral blood vessel to control the direction of the catheter.

In addition, the outer catheter is formed of a soft material, and the inner catheter is characterized in that formed of a hard material.

In addition, the external catheter enters the cerebral blood vessel in a coaxially coupled state with the internal catheter until it reaches a specific location in the cerebral blood vessel along the wire, and then is separated from the internal catheter and inserted into a specific location in the cerebral blood vessel. can be characterized.

In addition, the inner catheter may include a plurality of protrusions formed on a surface of the inner catheter to be in contact with the outer catheter.

In addition, the protrusion is characterized in that formed of a flexible material.

The cerebrovascular angiography catheter according to the embodiment of the present invention as described above can be used even in a sharply curved cerebral blood vessel without damage to the blood vessel wall due to stimulation.

In addition, since a single catheter can be used regardless of blood vessel shape, the versatility of the catheter can be increased and the risk of examination complications can be reduced.

1 is a perspective view of a cerebrovascular angiography catheter according to an embodiment of the present invention;
Figure 2 is an exploded perspective view of Figure 1;
3 is a perspective view showing projections formed on the inner catheter of the cerebrovascular angiography catheter according to an embodiment of the present invention;
4 is a perspective view illustrating a state in which a protrusion moving part is formed on an internal catheter of a cerebrovascular angiography catheter according to an embodiment of the present invention.
Figure 5 is a cross-sectional view of Figure 4;
Figure 6 is an enlarged view of Figure 5;
7 (a) to (c) are exemplary diagrams illustrating the operation of the protrusion moving unit of the cerebrovascular angiography catheter according to the embodiment of the present invention.
Figure 8 (a), (b) is an exemplary view showing a state in which the cerebrovascular angiography catheter according to an embodiment of the present invention is inserted into a blood vessel.

Hereinafter, the description of the present invention with reference to the drawings is not limited to specific embodiments, and various transformations may be applied and various embodiments may be applied. In addition, the content described below should be understood to include all conversions, equivalents, or substitutes included in the spirit and scope of the present invention.

In the following description, terms such as first and second are terms used to describe various components, and are not limited in meaning per se, and are used only for the purpose of distinguishing one component from another.

Like reference numbers used throughout this specification indicate like elements.

Singular expressions used in the present invention include plural expressions unless the context clearly dictates otherwise. In addition, terms such as "include", "include" or "have" described below are intended to designate that features, numbers, steps, operations, components, parts, or combinations thereof described in the specification exist. should be construed, and understood not to preclude the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in the present application, it should not be interpreted in an ideal or excessively formal meaning. don't

In addition, in the description with reference to the accompanying drawings, the same reference numerals are given to the same components regardless of reference numerals, and overlapping descriptions thereof will be omitted. In describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted.

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 8 attached.

1 is a perspective view of a cerebrovascular angiography catheter according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of FIG. 1, and FIG. 3 is a state in which protrusions are formed on the catheter inside the cerebrovascular angiography catheter according to an embodiment of the present invention. FIG. 4 is a perspective view showing a state in which a protrusion moving part is formed on the inner catheter of a cerebral angiography catheter according to an embodiment of the present invention, FIG. 5 is a cross-sectional view of FIG. 4, and FIG. 6 is a view of FIG. 7 are enlarged views, and FIGS. 7 (a) to (c) are exemplary views illustrating the operation of the protrusion moving part of the cerebrovascular angiography catheter according to an embodiment of the present invention, and FIG. 8 (a) and (b) are views of this It is an exemplary view showing a state in which a cerebral angiography catheter according to an embodiment of the present invention is inserted into a blood vessel.

Cerebrovascular angiography is the most precise examination among examinations observed to diagnose cerebrovascular disease, and is a procedure in which a catheter is placed in an artery heading to the brain, a contrast agent is injected into the catheter, and examination is performed after imaging.

The cerebrovascular angiography catheter according to the present invention can be used for an examination of imaging cerebrovascular conditions by entering a blood vessel during a cerebrovascular angiography procedure, and allows the examination to be performed according to the shape of various blood vessels with one type of catheter.

Hereinafter, the structure of a cerebrovascular angiography catheter according to an embodiment of the present invention will be described in detail.

1 and 2, the cerebral angiography catheter (hereinafter referred to as catheter) according to an embodiment of the present invention can smoothly enter a blood vessel to be operated regardless of the shape of the blood vessel, and includes an external catheter 10, an internal It may include a catheter 20 and a wire 30.

First, the external catheter 10 is formed in a cylindrical shape extending in the longitudinal direction, and may have a receiving portion 11 made of a hollow longitudinal direction on the inside.

In addition, the external catheter 10 may be formed of a soft material having flexibility, and most preferably formed of silicone harmless to the human body, but is not limited thereto.

The inner catheter 20 is coaxially coupled with the outer catheter 10 through the receiving portion 11 of the outer catheter 10 and may have a hole 21 in the longitudinal direction.

In addition, the inner catheter 20 may serve to support the coaxially coupled outer catheter 10 formed of a hard material.

At this time, the internal catheter 20 may be provided with a material such as FRP (Fiberglass Reinforced Plastic), PVC, PP, PC, aluminum, wood, and the like, and is most preferably formed of polypropylene harmless to the human body, but is not limited thereto.

The wire 30 penetrates the inner catheter 20 through the hole 21 of the inner catheter 20 and enters the cerebral blood vessel to control the direction of the catheter.

The catheter configured as described above enters the cerebral blood vessel in a state in which the external catheter 10 and the internal catheter 20 are coaxially coupled along the wire 30, and the state is maintained until reaching a specific position in the cerebral blood vessel. Then, the catheter is characterized in that the external catheter 10 is separated from the internal catheter 20 and inserted into a specific location in the cerebral blood vessel.

This feature is possible because the external catheter 10 is formed of soft material and can be bent according to the vascular structure.

Accordingly, the catheter according to the embodiment of the present invention can be used for blood vessels that have a sharply curved shape or are difficult to enter with a general catheter, and have the advantage of not stimulating the blood vessel wall, so that the test can be stably performed.

On the other hand, the inner catheter 20 may be used alone without the outer catheter 10 when the shape of the blood vessel is not a sharp curve or complicated shape, that is, when a general catheter can be used.

In this case, after the internal catheter 20 reaches a specific location in the cerebral blood vessel, the cerebrovascular examination may be performed by injecting a contrast agent.

How to use the inner catheter 20 and the outer catheter 10 will be described in detail below.

Referring to FIG. 3 , the internal catheter 20 of the cerebrovascular angiography catheter according to an embodiment of the present invention may further include a protrusion 22 .

A plurality of protrusions 22 may be formed on the surface of the inner catheter 20 with a flexible material.

The protrusion 22 is in contact with the inner wall of the external catheter 10 to serve to increase the fixing force between the internal catheter 20 and the external catheter 10, and the external catheter 10 located in the blood vessel is connected to the internal catheter 20. can be easily separated from

At this time, the protrusion 22 may be bent due to an external force applied from the external catheter 10 when in contact with the external catheter 10, and when the external force caused by the external catheter 10 disappears, the external catheter 10 is caused by a restoring force. ) can be restored to the state before contact with it.

Accordingly, the external catheter 10 can not only move back and forth while the protrusion 22 is in contact with the inner wall during intravascular movement, but also adjust the movement speed due to the frictional force generated when in contact with the protrusion 22. There are advantages to being able to

Referring to FIGS. 4 to 7 , the internal catheter 20 of the catheter for cerebral angiography according to an embodiment of the present invention may include a protruding portion.

The protruding moving part is configured to increase the fixing force between the internal catheter 20 and the external catheter 10 or to adjust the moving speed of the external catheter 10 entering the blood vessel, and includes the moving tube 23, the moving protrusion 24 and the moving hole. (25) may be included.

First, the moving tube 23 may be located inside the inner catheter 20 and have a hollow interior so that the wire 30 may pass therethrough.

The moving protrusion 24 is formed to protrude from the moving tube 23 to the outside of the inner catheter 20, and may be provided to rotate in the forward and backward directions around the rotation shaft 26.

In addition, the moving protrusion 24 may be formed in the same shape as the protrusion 22, but is not limited thereto, and includes a pointed tip 240 and a moving hole 25 for applying frictional force to the external catheter 10 side. It may be composed of a body portion 241 coupled to.

At this time, the body portion 241 may include a first coupling portion 2411 at the lower end and a second coupling portion 2412 at the upper end, depending on positions.

The moving hole 25 is a hole formed so that the moving protrusion 24 can rotate in the forward and backward directions, and is a first coupling corresponding to the first coupling portion 2411 and the second coupling portion 2412 of the body portion 241. A hole 251 and a second coupling hole 252 may be included.

More specifically, the first coupling hole 251 is provided on the side of the moving pipe 23, and the first coupling part 2411 can be coupled through the first rotational shaft 261.

The second coupling hole 252 is provided on the side of the inner catheter 20 and the second coupling part 2412 can be coupled through the second rotational shaft 262 .

The moving hole 25 is most preferably formed in a trapezoidal shape with a width increasing toward the inside, but is not limited thereto.

On the other hand, the moving hole 25 may be formed with an angle α of both ends of 80 to 150 ° in a trapezoidal shape, and most preferably formed at 140 °, but is not limited thereto.

At this time, when the angle α is less than 80°, the space in which the moving protrusion 24 can rotate is narrow, so the effect of the moving protrusion is insignificant.

In addition, when the angle α exceeds 150°, it is difficult to adjust the rotational angle of the moving protrusion 24 as the space in which the moving protrusion 24 can rotate is widened, which is not preferable.

Referring to (a) to (c) of FIG. 7 , the operation of the protrusion moving unit can be confirmed in detail.

First, referring to (a) of FIG. 7 , a state in which the protrusion moving unit is fixed before moving can be confirmed.

The moving protrusion 24 protrudes to the outside of the inner catheter 20 to increase the fixing force between the inner catheter 20 and the outer catheter 10 in a state of contact with the inner wall of the outer catheter 10 .

Thereafter, the movement speed of the external catheter 10 may be adjusted according to the intravascular movement situation while moving the movement tube 23 in the forward and backward directions.

At this time, in the drawing, movement in an anterior direction means a direction in which the catheter is inserted into a blood vessel, and movement in a posterior direction means a direction in which a catheter located in a blood vessel is withdrawn.

7(b) shows a state in which the moving protrusion 24 moves forward on the drawing as the moving pipe 23 moves in the direction indicated on the drawing.

In this case, in a useful state when the external catheter 10 is inserted into the blood vessel, the movement speed of the external catheter 10 can be adjusted by adjusting the contact angle between the moving protrusion 24 and the external catheter 10 .

7(c) shows a state in which the moving protrusion 24 moves in the rearward direction on the drawing as the moving tube 23 moves in the direction indicated on the drawing.

In this case, it is a useful state when the external catheter 10 located in the blood vessel is withdrawn, and the movement speed of the external catheter 10 can be adjusted by adjusting the contact angle between the moving protrusion 24 and the external catheter 10 .

More specifically, the moving tube 23 is moved in the front or rear direction on the drawing, but as the movement angle α of the moving protrusion 24 rotates to the maximum, the external catheter 10 has a contact area with the moving protrusion 24. this narrows

Accordingly, as the frictional force between the external catheter 10 and the moving protrusion 24 is reduced, the movement speed of the external catheter 10 can be increased.

Conversely, as the movement of the moving protrusion 24 moves to a position where the angle formed with the external catheter 10 is at right angles, the contact area of the external catheter 10 with the moving protrusion 24 widens, and thus the frictional force increases. The movement speed of the external catheter 10 can be reduced.

In this way, the external catheter 10 can increase the fixing force with the internal catheter 20 through the protrusion movement.

In addition, since the movement speed of the external catheter 10 can be adjusted, the movement of the external catheter 10 is possible even in a blood vessel having a complex shape such as a meandering blood vessel, and the external catheter 10 can move without damaging the blood vessel wall. There are advantages to

Referring to (a) and (b) of FIG. 8 , as a method of using the cerebral angiography catheter formed as described above, locating a wire in a blood vessel, moving along the wire in a state in which the inner catheter and the outer catheter are overlapped The steps of advancing and separating the outer catheter from the inner catheter and injecting a contrast agent into the inner catheter may be included.

First, the step of locating the wire in the blood vessel is a step of first inserting the wire 30 by selecting the entrance of the blood vessel into which the catheter should enter. The wire may guide the direction and position in which the catheter should move.

Next, the step of moving along the wire with the inner catheter and the outer catheter overlapped is the wire ( 30) is the step of moving along.

The step of advancing the external catheter and separating it from the internal catheter is a step of separating the internal catheter 20 and the external catheter 10, which have moved along the wire 30, when a blood vessel having a sharp curve shape needs to be examined. It is a step that proceeds just before the curve formed in .

At this stage, the outer catheter 10 can be separated from the inner catheter 20 and moved forward along the wire 30 .

Finally, the step of injecting the contrast medium into the inner catheter is the step of injecting the contrast medium into the end of the inner catheter 20 when the external catheter 10 is separated from the inner catheter 20 and the forward movement is finished. A blood test may be performed.

At this time, the posterior end of the external catheter 10 is connected to the anterior end of the internal catheter 20, and thus the contrast medium can be transferred to the external catheter 10 through the internal catheter 20 and injected into the blood vessel 2. can make it

This method of use can be used in all blood vessels of various shapes, and when used in a blood vessel having a sharp curve, in particular, the test can be performed by inserting the catheter without stimulating the blood vessel wall, unlike conventional catheters.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims are also included in the scope of the present invention. that fall within the scope of the right.

1: catheter
2: blood vessels
10: external catheter
11: receiving part
20: internal catheter
21: Hall
22: projection
23: movement pipe
24: moving protrusion
240: distal end
241: body part
2411: first coupling part
2412: second coupling part
25: moving hall
251: first coupling hole
252: second coupling hole
26: axis of rotation
261: first rotation axis
262: second rotation axis
30: wire

Claims (5)

As a cerebrovascular angiography catheter used for cerebral angiography,
An external catheter having a cylindrical shape extending in the longitudinal direction and having a receiving portion made of a hollow longitudinal direction therein;
an inner catheter coaxially coupled to the outer catheter through the receiving portion and having a longitudinal hole; and
A wire penetrating the inner catheter through the hole and entering the cerebral blood vessel to control the direction of the catheter;
The internal catheter,
And a plurality of protrusions formed on the surface of the inner catheter to be in contact with the outer catheter,
The protrusion,
It is characterized by being formed of a flexible material,
The internal catheter,
A protrusion moving part including a moving tube, a moving protrusion, and a moving hole, configured to increase the fixing force with the external catheter or adjust the moving speed of the external catheter entering the blood vessel,
The moving protrusion,
Consisting of a pointed tip for applying frictional force to the external catheter and a body coupled to the moving hole,
the body part
Including a first coupling portion at the bottom and a second coupling portion at the top,
The moving hole,
A hole formed so that the moving protrusion can rotate in the forward and backward directions, including a first coupling hole and a second coupling hole corresponding to the first coupling portion and the second coupling portion of the body,
The first coupling hole,
It is provided on a side surface of the moving pipe, and the first coupling part is coupled through a first rotation shaft,
The second coupling hole is provided on the side of the inner catheter and coupled to the second coupling part through a second rotation shaft,
The moving protrusion,
Increase the fixing force between the inner catheter and the outer catheter by protruding outward of the inner catheter and in contact with the inner wall of the outer catheter;
The catheter for cerebrovascular angiography, wherein the moving tube is moved forward and backward to adjust the contact angle with the external catheter while adjusting the movement speed of the external catheter according to the movement situation in the blood vessel.
According to claim 1,
The external catheter,
made of soft material,
The internal catheter,
A cerebrovascular angiography catheter, characterized in that formed of a hard material.
According to claim 2,
The external catheter,
A cerebrovascular angiography catheter characterized in that it enters the cerebral blood vessel in a coaxially coupled state with the internal catheter until it reaches a specific location in the cerebral blood vessel along the wire, and then is separated from the internal catheter and inserted into a specific location in the cerebral blood vessel. .
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