JP2000271224A - Intracardiac catheter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multipurpose type intracardiac catheter which enables adaptation to different desired parts, for example, a right coronary artery, a left coronary artery and a left ventricle and also to different introduction parts, for example, a brachial artery and a radial artery with one catheter. SOLUTION: This intracardiac catheter 1 has a catheter body 2 constituted of a flexible tube and a hub 4. The catheter body 2 has a proximal part 21 and an intermediate part 22 extending almost linearly from the base end side thereof, a first curved part 31 curved at a specified angle to the intermediate part 22, a distal part 23 extending almost linearly from the first curved part 31, a second curved part 32 curved at a specified angle to the distal part 23 in the direction opposite to the first curved part 32 and a distal end part 24 extending almost linearly from the second curved part 32. The angle θ1 of the first curved part 31 is 60-120 deg.. The angle θ2 of the second curved part 32 is 5-45 deg..

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cardiac catheter used by being inserted into the heart or its surrounding tissues, particularly, the left and right coronary arteries and the left ventricle.

[0002]

2. Description of the Related Art In selective angiography, for example, when imaging the right coronary artery, a tip of a catheter is inserted into the entrance of the right coronary artery, a contrast agent is injected through the catheter, and a selective contrast image is obtained. And diagnosed coronary artery disease. At this time, a catheter whose tip shape is easily inserted into the right coronary artery is selected and used. As a type of catheter focusing on such a difference in the tip shape, for example, Judkins
Type and Ampplats type. Also, certain types of these, for example, Judkins type catheters, have different tip shapes for the right coronary artery and the left coronary artery.

[0003] However, the difference in the target part (contrast part), that is, the right coronary artery and the left coronary artery,
Different catheters must be selected and used to match them, and in the case of patients with special anatomical shaped vessels, it is necessary to use dedicated catheters of different shapes.

[0004] Therefore, a wide variety of catheters must be prepared in advance. In particular, when both the right coronary artery and the left coronary artery are to be imaged, the right coronary artery must be imaged with a catheter for the right coronary artery. In addition, it is necessary to replace the catheter with a catheter for the left coronary artery and to image the left coronary artery, which requires a lot of labor and time for the operation, and increases the burden on the patient.

Conventionally, coronary angiography catheters have been introduced percutaneously from the femoral artery by Seldinger method or sheath method and inserted into blood vessels. However, when the site of introduction of the catheter into the body is the thigh, the patient needs absolute rest for hemostasis at the puncture site. Therefore, urination, defecation, and eating and drinking must be performed in the supine position, and there is a problem that the patient suffers from considerable pain, such as low back pain.

Furthermore, when a catheter is introduced from the thigh, bleeding may occur even if absolute rest is maintained. If the bleeding reaches the retroperitoneal cavity, there is a danger to life. In some cases, urinary dysfunction occurs at the position, in which case there is a possibility of urinary tract infection, and there is a problem that urination must be performed using a urethral catheter.

[0007] As a method for solving these problems, it is considered that introduction of a catheter from the artery of the arm, particularly the brachial artery (Brachial Artery) or the radial artery (Radial Artery) is effective. That is, only by keeping the upper arm puncture part extended, walking is possible immediately after the operation, there is no lower back pain, urination, defecation, eating and drinking can be performed as usual, and bleeding and urine in the retroperitoneal cavity described above are also performed. There is no need to worry about tract infections.

[0008] However, at present, since introduction through the femoral artery is common, the majority of the catheters are catheters for femoral artery insertion, and suitable catheters designed to be introduced through the arm artery are very expensive. Less.

When such a femoral artery insertion catheter is used as it is for brachial artery insertion or radial artery insertion, the catheter introduction operation, in particular, inserting the catheter tip into the target coronary artery or left coronary artery is performed. This operation is difficult, requires a great deal of labor, and may require several repetitive introduction operations, resulting in an increase in the operation time and a load on the patient.

Further, the tip of the catheter once inserted into the ostium of the coronary artery falls off from the ostium of the coronary artery during the imaging, due to an inappropriate posture of the tip of the catheter, insufficient repulsion, and the like. In some cases, sufficient contrast cannot be obtained. Therefore, in this case, the operation of inserting the catheter tip into the coronary ostium again becomes necessary, and the burden on the patient increases.

[0011]

SUMMARY OF THE INVENTION An object of the present invention is to provide a single kind of catheter which can be used for different target sites such as a right coronary artery, a left coronary artery and a left ventricle.
For example, it is an object of the present invention to provide a multipurpose heart catheter capable of coping with different introduction sites such as a brachial artery and a radial artery.

[0012]

This and other objects are achieved by the present invention which is defined below as (1) to (9).

(1) A flexible tubular heart catheter, comprising a substantially straight proximal portion and a middle portion, and a first curved portion curved at an angle of 60 ° to 120 ° with respect to the middle portion. A curved portion, a distal portion extending substantially linearly from the first curved portion, and a second curved portion at an angle of 5 ° to 45 ° with respect to the distal portion in a direction opposite to the first curved portion. And a distal end that extends substantially linearly from the second bend.

(2) A tubular heart catheter having flexibility, comprising a substantially straight proximal portion and an intermediate portion, a first curved portion curved substantially at right angles to the intermediate portion, A distal portion extending substantially linearly from the first curved portion, a second curved portion curved in a direction opposite to the first curved portion and at an angle of 25 ° to 35 ° with respect to the distal portion; A distal end extending substantially linearly from the second bend.

(3) The length of the distal portion is 10 to 50 m
m. The heart catheter according to the above (1) or (2), wherein m is m.

(4) The cardiac catheter according to any one of (1) to (3), wherein the length of the distal end is 1 to 10 mm.

(5) The cardiac catheter according to any one of (1) to (4), wherein a radius of curvature of a center line of the first curved portion is 1 to 20 mm.

(6) The cardiac catheter according to any one of (1) to (5), wherein a radius of curvature of a center line of the second curved portion is 1 to 20 mm.

(7) The heart catheter according to any one of (1) to (6), wherein at least one side hole is provided in the distal portion on the side of the second curved portion.

(8) The cardiac catheter according to any one of (1) to (7), wherein the distal end has a soft member.

(9) The heart catheter according to any one of the above (1) to (8), which can be used by being introduced from the brachial artery or the radial artery.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a heart catheter of the present invention will be described in detail based on a preferred embodiment shown in the accompanying drawings.

FIG. 1 is a plan view showing the overall shape of the heart catheter of the present invention, FIG. 2 is an explanatory view showing a method of introducing the heart catheter of the present invention into a blood vessel, and FIGS.
It is explanatory drawing which shows typically the usage method of the heart catheter of this invention. In this specification, the right side in FIG. 1 is referred to as a “proximal end”, the left side as a “distal end”, and a side near the proximal end as a “proximal”.
The distal side is described as "distal".

As shown in FIG. 1, a heart catheter 1 of the present invention has a catheter body 2 formed of a flexible tube, and is attached (fixed) to the proximal end of the catheter body 2.
And a hub 4.

The outer diameter of the catheter body 2 is not particularly limited.
mm or less, more preferably 2.5 mm or less, and even more preferably 2.0 mm or less.

The catheter body 2 has a proximal portion 21 and an intermediate portion 22 which extend substantially linearly from the proximal end side, and a first curved portion 31 which is curved at a predetermined angle with respect to the intermediate portion 22.
A distal portion 23 extending substantially linearly from the first curved portion 31; and a second curved portion 32 curved at a predetermined angle to the distal portion 23 in a direction opposite to the first curved portion 31. And the second
And a distal end 24 extending substantially linearly from the curved portion 32 of the slab.

The proximal portion 21 and the intermediate portion 22 are substantially linear in a state where no external force is applied (natural state where no external force such as bending, twisting, pulling, or compression is applied).
Note that the proximal portion 21 and the intermediate portion 22 are continuous, have no boundaries, and may be integrated.

The length of the proximal portion 21 and the intermediate portion 22, that is, the length from the base end of the catheter body 2 to the first curved portion 31 is not particularly limited, but is usually 450 to 15
It is preferably about 00 mm, and 600 to 1200 m
m is more preferable. In the case of children and infants, the length may be shorter.

The first bending portion 31 is in a state where no external force is applied.
(Do not apply external force such as bending, twisting, pulling, compression, etc.
In a natural state). First
Angle of the curved portion 31 (the angle between the intermediate portion 22 and the distal portion 23)
Degree) θ₁Is 60 to 120 °, preferably 80 to
It is 100 °, and more preferably substantially right angle. θ ₁
<60 °, left coronary artery from brachial or radial artery
Insertion into the pulse may be difficult, and 120 °
Is difficult to insert into the left coronary artery, especially in the femoral artery.
May be difficult to insert into the left coronary artery.

The radius of curvature R ₁ of the center line of the first curved portion 31 is not particularly limited, but is preferably about 1 to 20 mm, and more preferably about 4 to 10 mm. If R ₁ is too small, the catheter main body 2 is likely to bend at the first curved portion 31 and the lumen 5 may be blocked, and if R ₁ is too large, insertion becomes difficult when the blood vessel diameter is small. .

The length of the distal portion 23 is not particularly limited, but is preferably about 10 to 50 mm, preferably 20 to 4 mm.
More preferably, it is about 0 mm. If this length is too short, insertion into the left and right coronary arteries may be difficult,
Moreover, it becomes easy to come off from the coronary ostium, and if it is too long, there is a possibility that the insertion into the coronary artery becomes too deep.

The second bending portion 32 bends (bends) in a direction opposite to the first bending portion 31 in a state where no external force is applied.
are doing. Theta ₂ (angle between the distal portion 23 and distal end 24) angle of the second curved portion 32 is 5 to 45 °, preferably 20 to 40 °, more preferably 25 to 35
°. The theta ₂ is less than 5 °, coaxial with the coronary artery becomes difficult to obtain, also exceeds 45 °, coaxial with the coronary artery as well as less than 5 ° it is difficult to obtain.

The radius of curvature R ₂ of the center line of the second curved portion 32 is not particularly limited, but is preferably about 1 to 20 mm, and more preferably about 5 to 15 mm. If R ₂ is too small, the catheter body 2 is likely to bend at the second curved portion 32 and the lumen 5 may be blocked, and if R ₁ is too large, the curved portion 3
It is difficult to make a large angle for the angle θ ₂ of ₂ .

The length of the distal end 24 is not particularly limited, but is preferably about 1 to 10 mm, and 2 to 6 mm.
More preferably, it is in the order of magnitude. With such a range, the distal end portion 24 can be suitably inserted into the left or right coronary artery.

Such a catheter body 2 is formed of a hollow flexible and flexible tube. Examples of a constituent material of the catheter body 2 include various resin materials such as polyamide, polyether polyamide, polyester polyamide, polyester, polyurethane, soft polyvinyl chloride, ABS resin, AS resin, and fluorine resin such as polytetrafluoroethylene. , Styrenic,
Polyolefin, polyurethane, polyester,
Various thermoplastic elastomers such as polyamide-based, polybutadiene-based, trans-polyisoprene-based, fluororubber-based, chlorinated polyethylene-based, and combinations of two or more of these (polymer alloys, polymer blends, laminates, etc.) ).

The catheter body 2 may be constituted by a single layer, or may be constituted by a laminate of two or more layers. Further, a reinforcing material may be provided in or between the layers. As the reinforcing material, for example, those formed of a linear body and those formed of a net-like body are exemplified.

Further, the number of layers constituting the catheter body 2, the constituent materials of each layer, the presence or absence of a reinforcing material, and the like may be different along the longitudinal direction of the catheter body 2. For example, in order to make the distal end portion of the catheter body 2 more flexible, for example, of the first curved portion 31, the distal portion 23, the second curved portion 32, and the distal end portion 24, At least one part may have a reduced number of layers, a more flexible material, or no stiffeners only in that part compared to the other parts.

Since the heart catheter 1 is inserted into the body while confirming its position under X-ray fluoroscopy, the constituent materials of the catheter body 2 include an X-ray opaque material (an X-ray contrast agent). Is preferably blended. As the X-ray opaque material, for example, barium sulfate, bismuth oxide, tungsten, or the like can be used.

The X-ray opaque material is not limited to the case where it is present over the entire length of the catheter body 2, but may be a part of the catheter body 2, for example, the first curved portion 3.
1, distal portion 23, second curved portion 32 and distal end 24
May be present in at least one of the following.

At substantially the center of the catheter body 2, a lumen 5 is formed over the entire length of the catheter body 2. The lumen 5 is open to the distal end 24.

Further, at least one side hole 6 is provided on the distal end side of the distal portion 23 (on the side of the second curved portion 32). The side hole 6 communicates with the lumen 5.

In the illustrated configuration, two side holes 6 are formed along the longitudinal direction of the catheter body 2.
The arrangement is not limited to this. For example, a plurality of side holes 6 may be formed along the circumferential direction of the catheter main body 2.
The number of the side holes 6 may be one or three or more.
Further, such side holes 6 may not be formed.

Although the diameter of the side hole 6 is not particularly limited, it is usually 0.3 to 1.5 mm depending on the outer diameter of the catheter body 2.
Degree is preferable, and about 0.4 to 1.0 mm is more preferable.

The distal end 24 preferably includes a soft member 25. This makes it possible to more reliably prevent damage to blood vessels due to the distal end of the catheter main body 2 when the heart catheter 1 is inserted into the body. In this case, even if the entire distal end portion 24 is formed of a soft member,
A part of the distal end portion 24, in particular, the tip portion may be formed of a soft member.

Examples of the constituent material of the soft member 25 include various rubber materials such as natural rubber, isoprene rubber, butadiene rubber, chloroprene rubber, silicone rubber, fluorine rubber, styrene-butadiene rubber, styrene, polyolefin, and polyurethane. And various thermoplastic elastomers such as polyester-based, polyester-based, polyamide-based, polybutadiene-based, trans-polyisoprene-based, fluororubber-based, and chlorinated polyethylene-based.

A hub 4 is attached to the proximal end of the catheter body 2. The hub 4 has a lumen communicating with the lumen 5. The lumen has an inner diameter substantially equal to the inner diameter of the lumen 5 and is continuous with the inner surface of the proximal end of the lumen 5 without any step.

From such a hub 4, a long object (linear body) such as a guide wire, catheters (for example, a balloon catheter for PTCA), an endoscope, an ultrasonic probe, and a temperature sensor is inserted. And various liquids such as a contrast agent (X-ray contrast agent), a drug solution, and physiological saline can be injected or withdrawn. Further, the hub 4 can be connected to other devices, for example, when measuring blood pressure or the like.

The heart catheter 1 as described above can be used by inserting its distal end into each part of the heart, in particular, any of the right coronary artery, the left coronary artery, and the left ventricle from the above-mentioned shape. In addition, the introduction site of the heart catheter 1 into the body can be not only a femoral artery but also a brachial artery or a radial artery.

Next, an example of a method of using the heart catheter 1 of the present invention will be described.

As shown in FIG. 2, the catheter introducer 7 is connected to, for example, the right upper arm artery by the Seldinger method.
An artery such as the right radial or right femoral artery (introduction site)
9 is inserted into the sheath 8 of the catheter introducer 7, and the heart catheter 1 of the present invention, in which the guide wire 10 is inserted into the lumen 5, is inserted into the sheath 8 of the catheter introducer 7. 9

Next, the heart catheter 1 is gradually advanced with the guide wire 10 preceding in the direction of the arrow in FIG. 2, and is advanced toward a target site (right coronary artery, left coronary artery, left ventricle, etc.). At this time, in order for the distal end portion 24 of the heart catheter 1 to smoothly pass through the curved portion of the blood vessel or to select a branch of the blood vessel, the guide wire 10 is inserted / removed, and the advance / retreat and rotation of the heart catheter 1 are performed. Perform operations that are appropriately combined.

The operation (technique) for inserting the distal end of the heart catheter 1 into the right coronary artery, the left coronary artery and the left ventricle will be described in detail below with reference to FIGS. All of these operations are performed while confirming the position and posture of the heart catheter 1 under fluoroscopy.

1. Insertion into the right coronary artery (mouth) (see FIG. 3). Puncture catheter introducer 7 into femoral artery,
With the guide wire 10 inserted into the lumen 5 of the heart catheter 1, the heart catheter 1 is inserted into the catheter introducer 7, and thereafter the guide wire 1 is inserted.
0, leading from the abdominal aorta 105 to the ascending aorta 10
Advance the distal end of the cardiac catheter 1 to zero. Thereafter, the guide wire 10 is removed, and the shape of the cardiac catheter 1 is returned to a pre-formed curved shape (natural state).

Next, the cardiac catheter 1 is gently pushed deeper than the right coronary artery orifice 101 to the vicinity of the aortic valve 102, and the tip of the cardiac catheter 1 is brought into contact with the right inner wall 103 of the ascending aorta 100 and turned clockwise. While pulling back slowly, the distal end 2 of the cardiac catheter 1
4 is inserted into the right coronary ostium 101.

Similarly, when the catheter introducer 7 is punctured into the brachial artery or the radial artery, after the distal end of the heart catheter 1 passes through the brachiocephalic artery 107 and enters the ascending aorta 100, the progress of the heart catheter 1 is similarly performed. Stop and remove the guide wire 10. Thereafter, the same operation as described above is performed, and the distal end portion 24 of the heart catheter 1 is set.
Is inserted into the right coronary ostium 101.

2. Insertion into the left coronary artery (mouth) (see FIG. 4) Puncture the catheter introducer 7 into the femoral artery,
With the guide wire 10 inserted into the lumen 5 of the heart catheter 1, the heart catheter 1 is inserted into the catheter introducer 7, and thereafter the guide wire 1 is inserted.
0, leading from the abdominal aorta 105 to the ascending aorta 10
Advance the distal end of the cardiac catheter 1 to zero. Distal end 2
4 is positioned about 10 cm above the left coronary ostium 106, the advance of the cardiac catheter 1 is stopped and the guide wire 10
To return the shape of the heart catheter 1 to a preformed curved shape (natural state).

Next, when the heart catheter 1 is slowly pushed forward while confirming the position of the tip of the heart catheter 1, the tip (distal end portion 24) of the heart catheter 1 comes into contact with the left inner wall 104 of the ascending aorta 100. While moving downward, it is inserted into the left coronary ostium 106.

The distal end (distal end 24) of the heart catheter 1
Is facing away from the left coronary ostium 106,
The heart catheter 1 is slightly rotated in the counterclockwise direction so that the distal end portion 24 is directed toward the left coronary artery ostium 106 and slowly pushed forward. This allows the distal end 24 to be easily inserted into the left coronary ostium 106.

Similarly, when the catheter introducer 7 is punctured into the brachial artery or the radial artery, after the distal end of the cardiac catheter 1 passes through the brachiocephalic artery 107 and enters the ascending aorta 100, the progress of the cardiac catheter 1 is similarly performed. Stop and remove the guide wire 10.

Next, while confirming the position of the distal end of the heart catheter 1, the heart catheter 1 is slowly pushed forward.
Thus, the distal end of the heart catheter 1 is inserted into the left coronary ostium 106 in the same manner as described above.

The distal end of the cardiac catheter 1 (the distal end 2
4) is facing the opposite direction to the left coronary artery ostium 106, the heart catheter 1 is slightly rotated counterclockwise to turn the distal end 24 toward the left coronary artery ostium 106 and slowly slowly. Push forward. Thereby, the distal end 2
4 is easily inserted into the left coronary ostium 106.

3. Insertion into the left ventricle (see FIG. 5) When the catheter introducer 7 is punctured into the brachial artery or the radial artery, the guide wire 10 is preceded,
Ascending aorta 1 from subclavian artery via brachiocephalic artery 107
At 00, the distal end (distal end 24) of the cardiac catheter 1 is located. When the heart catheter 1 is gradually advanced toward the center of the apex of the aortic valve 102 while repeatedly moving the heart catheter 1 forward and backward, the distal end of the heart catheter 1 passes through the aortic valve 102 and enters the left ventricle 108. Inserted.

When the catheter introducer 7 is punctured into the femoral artery, the guide wire 10 is advanced, and the elasticity and flexibility of the cardiac catheter 1 are used to move the cardiac catheter 1 along the abdominal aorta 105 and the aortic arch 109. The distal end (distal end 24) of the heart catheter 1 is positioned in the ascending aorta 100. When the heart catheter 1 is repeatedly advanced and retracted, the heart catheter 1 is gradually advanced toward the apex central portion of the aortic valve 102, and further rotating operation is performed, the tip of the heart catheter 1 passes over the aortic valve 102. Inserted into the left ventricle.

After the distal end 24 of the heart catheter 1 is inserted into the target site by the above operation, the guide wire 10 is removed from the lumen 5. When performing X-ray imaging of a target site with a contrast agent, a connector is connected to the hub 4 and the contrast agent is injected. The injected contrast agent passes through the lumen 5, is ejected from the distal end opening of the distal end 24 and the side hole 6, and is supplied to the target site. As a result, X-ray imaging of the target site becomes possible.

The use of the heart catheter 1 of the present invention is not particularly limited, and for example, a balloon catheter, a rotor / breater catheter, an athermy catheter, an ultrasonic catheter, and the like may be introduced in addition to the above-described catheter for imaging. The present invention can be applied to a guiding catheter for performing injection, a catheter for administering a drug solution (thrombolytic agent or the like), and the like.

[0066]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described.

(Example 1) A heart catheter having a catheter body having the following conditions and having the structure shown in FIG. 1 was manufactured.

Overall length: 850 mm Outer diameter: 1.67 mm Inner diameter (lumen diameter): 1.1 mm Material: Polyether polyamide Angle θ _{1 of first} curved portion: 90 ° Radius of curvature R ₁ of first curved portion: 5 0.0 mm Length of distal portion: 30 mm Angle θ _{2 of second} curved portion: 30 ° Radius of curvature R ₂ of second curved portion: 10 mm Length of distal end portion: 3 mm Forming position of side hole: far Two at the end of the position at 5.0 mm intervals Side hole diameter: 0.5 mm Soft member installation: A soft tip made of polyamide elastomer is installed at the tip of the distal end.

<Clinical Test 1> A catheter introducer having a 5F (French) sheath in the right upper arm artery was percutaneously placed in three patients A, B and C by the above-mentioned procedure. The heart catheter was introduced through a sheath and inserted into a blood vessel. Thereafter, the distal end of the cardiac catheter was sequentially inserted into the right coronary artery, the left coronary artery, and the left ventricle, and an X-ray contrast medium was injected to perform X-ray contrast. Obtained.

With one type of cardiac catheter, the right coronary artery,
The catheter tip was quickly, safely and securely inserted into each of the left coronary artery and the left ventricle, and X-ray imaging was performed.

<Clinical Test 2> A catheter introducer having a 5F (French) sheath in the right radial artery was percutaneously placed in three patients D, E, and F by the above-described procedure. The heart catheter was introduced through a sheath and inserted into a blood vessel. Thereafter, the distal end of the cardiac catheter was sequentially inserted into the right coronary artery, the left coronary artery, and the left ventricle, and an X-ray contrast medium was injected to perform X-ray contrast. Obtained.

With one type of cardiac catheter, the right coronary artery,
The catheter tip was quickly, safely and securely inserted into each of the left coronary artery and the left ventricle, and X-ray imaging was performed.

<Clinical Test 3> A catheter introducer having a 5F (French) sheath in the right femoral artery was percutaneously placed in three patients G, H, and I by the above-described procedure. The heart catheter was introduced through a sheath and inserted into a blood vessel. Thereafter, the distal end of the cardiac catheter was sequentially inserted into the right coronary artery, the left coronary artery, and the left ventricle, and an X-ray contrast medium was injected to perform X-ray contrast. Obtained.

With one type of cardiac catheter, the right coronary artery,
The catheter tip was quickly, safely and securely inserted into each of the left coronary artery and the left ventricle, and X-ray imaging was performed.

(Example 2) A heart catheter similar to that of Example 1 was manufactured except that the following conditions were different.

The angle θ _{1 of} the first curved portion: 85 ° The radius of curvature R ₁ of the first curved portion: 10 mm The length of the distal portion: 35 mm The angle θ ₂ of the second curved portion: 27 ° Second Curvature radius of curvature R ₂ : 15 mm Length of distal end: 4 mm

When clinical trials similar to clinical trials 1, 2, and 3 were performed on a total of nine other patients, in each clinical trial, as in the above, one kind of cardiac catheter was used to obtain the right coronary artery, For each of the left coronary artery and left ventricle
Quickly, safely and securely insert the catheter tip and
Line imaging could be performed.

[0078]

As described above, according to the present invention, 1
Different types of catheters can accommodate different target sites such as, for example, the right coronary artery, the left coronary artery, and the left ventricle, and various blood vessel shapes.

Therefore, for example, when the tip of the catheter is inserted into two or more target sites to perform injection or treatment of an X-ray contrast agent, it is not necessary to exchange the heart catheter for each target site, and the operation is not required. The labor, time and burden on the patient can be greatly reduced.

Further, the heart catheter of the present invention has a wide range of selection of a site to be introduced into the body. For example, it can be introduced into the body not only from the femoral artery but also from the brachial artery and the radial artery.

Therefore, the puncture site is less likely to bleed after the operation, and the patient is not forced to rest and can walk, so that the pain and burden on the patient are reduced. In addition, safety is high, and postoperative infection (such as urinary tract infection accompanying urination in a supine position) can be prevented.

Further, the heart catheter of the present invention is excellent in operability, so that it is easy to perform an operation of introducing the catheter into the body, particularly, an operation of transferring and inserting the distal end of the catheter to a target site, and furthermore, the operation is safe. Can be done.

Also, since the catheter has a sufficient repulsive force, its posture is stably maintained even after the catheter tip is once inserted into the target portion, so that the catheter tip comes off or shifts from the target portion. It is hard to happen. Therefore,
Imaging and treatment can be sufficiently continued.

Thus, the labor and time required for the operation can be reduced, and the burden on the patient can be reduced.

[Brief description of the drawings]

FIG. 1 is a plan view showing the overall shape of a heart catheter of the present invention.

FIG. 2 is an explanatory diagram showing a method for introducing a heart catheter of the present invention into a blood vessel.

FIG. 3 shows the insertion of the heart catheter of the present invention into the right coronary artery.
It is explanatory drawing which shows the usage method at the time of indwelling typically.

FIG. 4 shows the insertion of the heart catheter of the present invention into the left coronary artery.
It is explanatory drawing which shows the usage method at the time of indwelling typically.

FIG. 5 is an explanatory view schematically showing how to use the heart catheter of the present invention when inserting and placing it in the left ventricle.

[Explanation of symbols]

 Reference Signs List 1 heart catheter 2 catheter main body 21 proximal portion 22 intermediate portion 23 distal portion 24 distal end portion 25 soft member 31 first curved portion 32 second curved portion 4 hub 5 lumen 6 side hole 7 catheter introducer 8 sheath 81 distal end Opening 9 Artery 10 Guidewire 100 Ascending aorta 101 Right coronary ostium 102 Aortic valve 103 Right inner wall 104 Left inner wall 105 Abdominal aorta 106 Left coronary ostium 107 Brachiocephalic artery 108 Left ventricle 109 Aortic arch

Claims (9)

[Claims] 1. A flexible tubular heart catheter, comprising: a substantially straight proximal portion and a middle portion; and a first curve curved at an angle of 60 ° to 120 ° with respect to the middle portion. A distal portion extending substantially linearly from the first curved portion; and a direction opposite to the first curved portion with respect to the distal portion and 5
A cardiac catheter, comprising: a second curved portion curved at an angle of 45 to 45 degrees; and a distal end extending substantially linearly from the second curved portion. 2. A tubular heart catheter having flexibility, comprising: a substantially straight proximal portion and a middle portion; a first curved portion curved substantially at right angles to the middle portion; A distal portion extending substantially linearly from one of the curved portions, and a direction opposite to the first curved portion with respect to the distal portion, and
A cardiac catheter, comprising: a second curved portion curved at an angle of 5 ° to 35 °; and a distal end extending substantially linearly from the second curved portion. 3. The cardiac catheter according to claim 1, wherein the length of the distal portion is 10 to 50 mm. 4. The cardiac catheter according to claim 1, wherein the length of the distal end is 1 to 10 mm. 5. The cardiac catheter according to claim 1, wherein a radius of curvature of a center line of the first curved portion is 1 to 20 mm. 6. The cardiac catheter according to claim 1, wherein a radius of curvature of a center line of the second curved portion is 1 to 20 mm. 7. The cardiac catheter according to claim 1, wherein at least one side hole is provided in the distal portion on the side of the second curved portion. 8. The cardiac catheter according to claim 1, wherein the distal end includes a soft member. 9. The cardiac catheter according to claim 1, which can be used by being introduced from a brachial artery or a radial artery.