JP2001212241A - Catheter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an angiography catheter which can be safely inserted into a blood vessel without hurting its wall and efficiently adjust the spurts of contrast medium. SOLUTION: The catheter is provided with a tubular body area 120 and a semicircular dome-shaped head area 110 which continues from the body 120 area and has a hole on the top. The head area 110 is made of materials such as silicone rubber which can easily change its shape so as not to hurt the wall of a blood vessel when the angiography catheter 100 is inserted. The hole 111 is provided on the top of the head area 110 and side holes 121, 122 are provided on the side of the body area.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a catheter, and more particularly to a catheter structure.

[0002]

2. Description of the Related Art In recent years, as a method for examining the form of a blood vessel, a method of injecting a contrast agent into a blood vessel and performing X-ray contrast of the blood vessel is generally used. An angiographic catheter is used. Here, as an example of an inspection method using this angiographic catheter,
A brief description of cardiac catheterization will be given.

As shown in FIG. 7, a coronary artery for supplying nutrients to the cells of the heart 1 is laid around the heart 1. The heart 1 is provided with an superior vena cava 2, an inferior vena cava 3, and an ascending aorta 4. The coronary arteries include a left coronary artery 5 and a right coronary artery 6 from the root of the ascending aorta 4.
Is provided.

When performing a left coronary angiography test in the cardiac catheterization method, as shown in an enlarged view of FIG. 8, an angiographic catheter 200 is guided from an artery located at the crotch or the like toward the ascending aorta 4, and the Valsalva sinus is introduced. The distal portion of the angiographic catheter 200 is inserted into the ostium 5a of the left coronary artery 5 located at 8. When the angiographic catheter 200 is inserted, a contrast agent is injected from an angio syringe (not shown) connected to the angiographic catheter 200, and X-ray imaging is performed while ejecting the contrast agent from the distal end portion of the angiographic catheter 200. While confirming the position of the distal end portion of the angiographic catheter 200,
Zero insertion is performed.

When performing a right coronary angiography examination, first, the distal end portion of the angiographic catheter 200 is located near the ostium 6a of the right coronary artery 6.

Here, a conventional angiographic catheter 200
As shown in FIG. 9, the structure of
And a tip region 202 which is continuous with the main body region 201 and has an opening at the tip portion. Body area 201
Is made of a member such as nylon or polyurethane in which a wire is braided, and the tip region 202 is made of silicon that can be easily deformed so as not to damage the inner wall of the blood vessel when the angiographic catheter 200 is inserted. Materials such as rubber and polyurethane are used. Thus, the main body region 201 and the tip region 202 are formed of different members,
As shown in FIG. 10, the main body region 201 and the tip region 202
Is bonded using an adhesive technique such as an adhesive, heat welding, or ultrasonic welding.

The outer diameter of the angiographic catheter 200 is 5 Fr (French: outer diameter, about 1.67 m).
m), 4 Fr (outer diameter, about 1.33 mm), and recently 3 Fr (outer diameter, about 1.00 mm) have been used.

[0008]

As described above, in recent years, an angiographic catheter having a smaller outer diameter has been desired. For example, in the case of 3Fr, the outer diameter is about 1.0 mm. About. When the outer diameter of the angiographic catheter is reduced in this manner, the following two problems may occur.

The first problem is that the angiographic catheter 20
In the tip region 202 of 0, a material such as silicone rubber or polyurethane is used in order to prevent the inner wall of the blood vessel from being damaged when the angiographic catheter 200 is inserted. Even when such a material is used, the tip region 202 is not flexibly deformed,
It may damage the inner wall of the blood vessel.

The second problem is that, for the above-described reason, although it is necessary to eject the contrast medium so that the contrast medium stagnates to the left of the port 5a of the left coronary artery 5 located in the sinus of Valsalva 8, angiography is performed. When the outer diameter of the catheter 200 becomes smaller, the inner diameter becomes smaller, so that the ejection velocity of the contrast medium becomes faster, and the port 5 a of the left coronary artery 5 located in the sinus valsalva 8.
It may be difficult to delicately eject the contrast agent so that the contrast agent stagnates in the vicinity of.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems, and it is possible to safely insert an angiographic catheter into a blood vessel without damaging the inner wall of the blood vessel, and to eject a contrast medium. An object of the present invention is to provide an angiographic catheter having a structure capable of performing good adjustment.

[0012]

According to the present invention, there is provided a catheter for injecting a liquid agent into a blood vessel, the tubular body region being continuous with the body region and having an opening at a distal end portion. A tip region having a portion,
The distal end region has an outer shape that gradually narrows toward the distal end side.

[0013] As described above, the distal end region has an outer shape that gradually narrows toward the distal end side.
A catheter can be safely inserted into a blood vessel without damaging the inner wall of the blood vessel.

In a preferred embodiment, the tip region has a dome shape. By adopting this shape, the catheter can be more safely inserted into the blood vessel without damaging the inner wall of the blood vessel.

In a preferred embodiment, the opening has a substantially circular opening region provided at a tip portion, and a slit extending radially outward from the opening region. According to this configuration, it is possible to favorably control the ejection of the liquid agent.

In a preferred embodiment, a side hole is provided in the body region near the tip region. Thus, even when the opening area of the substantially circular opening region provided at the distal end portion is reduced by providing the side hole, the side hole is located near the opening of the left coronary artery located in the sinus of Valsalva from the side hole. Since the liquid agent can be ejected so that the liquid agent stagnates, the ejection of the liquid agent can be adjusted more favorably.

In a preferred embodiment, the distal end region has an outer shape that gradually narrows toward the distal end without expanding from the outer diameter of the tube in the main body region.

In a preferred embodiment, the liquid agent is a contrast medium, and the catheter is used for performing X-ray imaging of the blood vessel.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A structure of an angiographic catheter will be described below as an example of an embodiment based on the present invention with reference to the drawings.

(Structure of angiographic catheter 100) FIG.
1 is an overall perspective view showing a structure of a distal end portion of an angiographic catheter 100 according to the present embodiment. The structure of the angiographic catheter 100 includes a tubular body region 120,
A dome-shaped tip region 110 that is continuous with the main body region and has an opening at the tip portion is provided. Body area 12
Reference numeral 0 denotes a member made of nylon, polyurethane, or the like in which a wire is braided, and the distal end region 110 can be easily deformed so as not to damage the inner wall of the blood vessel when the angiographic catheter 100 is inserted. Silicon rubber,
A material such as polyurethane is used, and a dome shape having a substantially semicircular shape as shown is employed.

An opening 111 is provided at the tip of the tip region 110. The shape of the opening 111 depends on the ejection conditions of the contrast agent and the angiographic catheter 100.
Various shapes are selected from the insertion conditions of a guide wire (not shown) used for insertion into a blood vessel.

For example, as shown in FIG. 2, a circular opening 111a is provided at the center, and a slit 111b extending radially outward from the circular opening 111a is formed at 90 °.
The shape of the opening 111 provided at the pitch is adopted. This opening shape satisfies the ejection condition of the contrast agent by the circular opening 111a, and the slit 111b is provided at a 90 ° pitch to form the opening 111 of the guide wire (not shown).
Is satisfied. However, the opening shape of the opening 111 is not limited to the shape shown in FIG. 2, as long as it satisfies the ejection condition of the contrast agent and the insertion condition of the guide wire (not shown), as shown in FIG. 3. It is also possible to provide an opening 112 in which slits extending greatly from the center to the side are provided at a pitch of 120 °, and various other opening shapes are selected.

Referring again to FIG. 1, in the angiographic catheter 100 of the present embodiment, the main body region 2
01 are provided with side holes 121 and 122 on the side surface.
Regarding the opening shape of the side holes 121 and 122, the opening 11
As long as it satisfies the relationship with the opening area of 1, it is possible to select a circular shape, an elliptical shape, a slit shape and other various opening shapes.

Here, it is preferable that the total of the opening areas of the openings 111 is set to be larger than the total of the opening areas of the side holes 121 and 122. This is the opening 1
When the ejection flow rate of the contrast agent from 11 is equal to or more than a predetermined value,
Turbulence occurs in the contrast agent in the tip region, and the side holes 121, 1
The contrast medium is ejected from the nozzle 22, and simultaneously with the ejection of the angiographic catheter 100 to the distal end side, the side holes 121, 1.
This is because it is possible to eject the contrast agent from the nozzle 22.

As shown in FIG. 4, the main body region 120 and the front end region 110 are formed of different members, and the main body region 120 and the front end region 110 are bonded by using an adhesive technique such as an adhesive, heat welding, or ultrasonic welding. Be combined. Here, the tip region 110 is
It is preferable to have the dome region 110b and the straight region 110a from the viewpoint of easy adhesion to the main body region 120 and prevention of damage to the inner wall of the blood vessel. Also,
The outer diameter of the straight region 110a is provided to be the same as the outer diameter of the main body region 120.

The shape of the distal end region 110 is not limited to a dome shape, and the distal end region 110 preferably has an outer shape that gradually narrows toward the distal end. More preferably, the distal end region 110 preferably has an outer shape that gradually narrows toward the distal end without swelling from the outer shape of the tube of the main body region 120.

(Cardiac Catheter Inspection) Next, a coronary angiography examination using the angiographic catheter 100 having the above structure will be described with reference to FIGS.

When the contrast medium is slowly injected from an angio syringe (not shown) connected to the angiography catheter 100, as shown in FIG. From the relationship with the opening area, the contrast agent is ejected from the opening 111 (C3), and almost no contrast agent is ejected from the side holes 121 and 122.

On the other hand, when the contrast agent is quickly injected from an angio syringe (not shown), turbulence occurs in the contrast agent in the tip region 110 as shown in FIG. Not only squirting (C1),
The contrast agent is also ejected from the side holes 121 and 122 (C2).

As described above, even when the external dimensions of the angiographic catheter 100 are reduced, according to the angiographic catheter 100 of the present embodiment, the distal region 110 gradually narrows toward the distal side. By having a dome shape, the angiography catheter 100 can be safely inserted into the blood vessel without damaging the inner wall of the blood vessel.

Further, since the ejection state of the contrast agent can be easily adjusted according to the injection speed of the contrast agent from an angio syringe (not shown), the ejection of the contrast agent to the distal end side of the angiography catheter 100 is performed simultaneously. , Side holes 121, 122
, The contrast agent can be ejected so as to stagnate in the vicinity of the ostium of the coronary artery located in the sinus of Valsalva, so that the reliability of the coronary angiography examination can be improved.

The structure of the angiographic catheter is as follows:
The present invention can be applied to various other types of catheters such as a straight hole catheter, a side hole catheter, and a pigtail catheter.

In the above embodiment, the case where the angiographic catheter according to the present embodiment is applied to cardiovascular imaging is described as an example. However, the present invention can also be used in the case of angiography of other organs. It is.

Also, a case is described in which a contrast medium is injected as angiography to perform X-ray contrast of a blood vessel, but the present invention is applied to a catheter for introducing a liquid material such as a drug into a blood vessel for treatment. It is also possible. Here, the liquid agent refers to a contrast agent, a drug, and all other substances introduced into a blood vessel.

Therefore, the above-described embodiment disclosed above is merely an example in all respects, and is not considered to be restrictive. The technical scope of the present invention is defined by the terms of the claims, rather than the description above, and includes all modifications within the scope and meaning equivalent to the terms of the claims.

[Brief description of the drawings]

FIG. 1 shows an angiographic catheter 1 according to the present embodiment.
It is the 1st whole perspective view which shows the structure of the front-end | tip part of 00.

FIG. 2 is a view showing a shape of an opening 111;

FIG. 3 is a view showing a shape of an opening 112;

FIG. 4 is an angiographic catheter 1 according to the present embodiment.
It is the 2nd whole perspective view which shows the structure of the front-end | tip part of 00.

FIG. 5 shows an angiographic catheter 1 according to the present embodiment.
FIG. 10 is a first diagram showing a left coronary angiography test using 00.

FIG. 6 shows an angiographic catheter 1 according to the present embodiment.
FIG. 10 is a second diagram showing a left coronary angiography test using 00.

7 is an overall view showing a left coronary artery 5 and a right coronary artery 6 provided in the heart 1. FIG.

FIG. 8: Port 5 of Left Coronary Artery 5 and Sinus Valsalva 8
3 is a partially enlarged view showing the state of the heart 1 in the vicinity of FIG.

FIG. 9 shows an angiographic catheter 20 according to the prior art.
FIG. 2 is a first general perspective view showing a structure of a leading end portion of a zero.

FIG. 10 shows an angiography catheter 2 according to a conventional technique.
It is the 2nd whole perspective view which shows the structure of the front-end | tip part of 00.

[Explanation of symbols]

1 heart, 2 superior vena cava, 3 inferior aorta, 4 ascending aorta, 5 left coronary artery, 6 right coronary artery, 5a, 6a ostium, 7 arterial valve, 8 sinus of Valsalva, 100, 200
Angiographic catheter, 111a circular opening, 120,
201 body region, 110, 202 tip region, 111
b, 112 slits, 121, 122 side holes.

Claims (6)

[Claims] 1. A catheter for injecting a liquid agent into a blood vessel, comprising: a tubular main body region; and a distal end region continuous with the main body region and having an opening at a distal end portion, wherein the distal end region comprises: A catheter having an outer shape that gradually narrows toward the distal end. 2. The tip region has a dome shape.
The catheter according to claim 1. 3. The catheter according to claim 1, wherein the opening has a substantially circular opening region provided at a distal end portion, and a slit extending radially outward from the opening region. 4. The catheter according to claim 1, wherein a side hole is provided in the body region near the distal end region. 5. The catheter according to claim 1, wherein the distal end region has an outer shape that gradually narrows toward the distal end without swelling from the outer diameter of the tube of the main body region. 6. The liquid medicine is a contrast medium, and the catheter is used for performing X-ray contrast of the blood vessel.
The catheter according to claim 1.