JP4458571B2 - Cardiac catheter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heart catheter used by being inserted into the heart or its surrounding tissues, particularly the left and right coronary arteries and the left ventricle.
[0002]
[Prior art]
In selective angiography, for example, when imaging the right coronary artery, the distal end of the catheter is inserted into the entrance of the right coronary artery, a contrast medium is injected through the catheter, a selective contrast image is obtained, and the coronary artery is obtained. He was diagnosing arterial disease. At this time, a catheter whose tip shape is easy to insert into the right coronary artery is selected and used. Examples of the types of catheters that pay attention to such a difference in tip shape include a Judkins type and an Anplatz type. Further, even 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, it is necessary to select and use different catheters corresponding to the difference in the target site (contrast site), that is, the right coronary artery and the left coronary artery, respectively, and a blood vessel having a special anatomical shape. In the case of a patient who has, it is necessary to use a dedicated catheter having a different shape.
[0004]
Therefore, it is necessary to prepare a wide variety of catheters in advance, and in particular, when imaging both the right coronary artery and the left coronary artery, after imaging the right coronary artery with the right coronary artery catheter, the catheter Since the left coronary artery needs to be imaged by replacing it with a catheter for the left coronary artery, there is a problem in that the work requires a lot of labor and time and the burden on the patient increases.
[0005]
Conventionally, coronary angiography catheters have been introduced percutaneously from the femoral artery and inserted into blood vessels by the Seldinger method or the sheath method. However, when the introduction site of the catheter into the body is the thigh, the patient needs to rest absolutely because of hemostasis at the puncture site. Therefore, urination, defecation, and eating and drinking must be performed in a supine position, and there is a problem that the patient suffers from considerable pain such as low back pain.
[0006]
Furthermore, when a catheter is introduced from the thigh, bleeding may occur even if absolute rest is maintained, and if the bleeding reaches the retroperitoneal cavity, there is a risk of life, and urination is performed in the supine position. In some cases, there were difficulties, in which case there was a possibility of urinary tract infection, and there was a problem that urination had to be performed using a urinary catheter.
[0007]
As a method for solving these problems, it is considered effective to introduce a catheter from the artery of the arm, particularly from the brachial artery (Brachial Artery) or the radial artery (Radial Artery). That is, it is possible to walk immediately after the operation only by keeping the upper arm puncture portion stretched, there is no back pain, etc., and urination, defecation, and eating and drinking can be performed as usual. There is no need to worry about road infections.
[0008]
However, at present, since introduction from the femoral artery is common, most of them are catheters for femoral artery insertion, and very few suitable catheters are designed to be introduced from the artery of the arm.
[0009]
When such a femoral artery insertion catheter is used as it is for brachial artery insertion or radial artery insertion, there is an operation for introducing the catheter, particularly an operation for inserting the distal end of the catheter into the right coronary artery or the left coronary artery which is the target site. This is difficult, requires a lot of labor, and may require several repeated introduction operations, resulting in an increase in operation time and an increase in the burden on the patient.
[0010]
In addition, the catheter tip once inserted into the coronary ostium is detached from the coronary ostium during imaging due to inappropriate posture of the catheter tip or lack of repulsive force. Sometimes it is impossible to do so. Therefore, in this case, it is necessary to insert the catheter tip again into the coronary artery opening, which increases the burden on the patient.
[0011]
[Problems to be solved by the invention]
The object of the present invention is to deal with different target sites such as the right coronary artery, the left coronary artery and the left ventricle with a single type of catheter, and also to different introduction sites such as the brachial artery and radial artery. The object is to provide a multipurpose cardiac catheter that can be used.
[0012]
The purpose of this is as follows (1) to (5) This is achieved by the present invention.
[0013]
(1) A tube-shaped cardiac catheter having flexibility,
A generally straight proximal and intermediate portion;
For the intermediate part 85 ° ~ 90 ° A first curved portion curved at an angle of
A distal portion extending generally linearly from the first curved portion;
Opposite to the first curved portion with respect to the distal portion and 27 ° -30 ° A second curved portion curved at an angle of
A distal end extending substantially linearly from the second curved portion,
The radius of curvature of the center line of the first curved portion is 5.0mm-10mm And
The radius of curvature of the center line of the second curved portion is 10mm ~ 15mm And
Introduced from the right upper brachial artery, right radial artery or right femoral artery, A cardiac catheter which can be inserted into the right coronary artery, the left coronary artery and the left ventricle.
[0015]
(2) The length of the distal part is 30mm to 35mm Above is (1) The cardiac catheter according to 1.
[0016]
(3) The length of the distal end is 3mm ~ 4mm Above is (1) or (2) The cardiac catheter according to 1.
[0019]
(4) The above, wherein at least one side hole is provided on the second curved portion side of the distal portion One of (1) to (3) The cardiac catheter according to 1.
[0020]
(5) The distal end comprises a soft member One of (1) to (4) The cardiac catheter according to 1.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the cardiac catheter of the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings.
[0023]
FIG. 1 is a plan view showing the overall shape of the cardiac catheter of the present invention, FIG. 2 is an explanatory view showing a method of introducing the cardiac catheter of the present invention into a blood vessel, and FIGS. 3 to 5 are respectively the heart of the present invention. It is explanatory drawing which shows the usage method of a catheter typically. In this specification, the right side in FIG. 1 is described as “base end”, the left side as “tip”, the side close to the base end as “proximal”, and the far side “distal”.
[0024]
As shown in FIG. 1, the cardiac catheter 1 of the present invention is composed of a catheter body 2 composed of a flexible tube and a hub 4 attached (fixed) to the proximal end of the catheter body 2. ing.
[0025]
The outer diameter of the catheter body 2 is not particularly limited, but is preferably 3 mm or less, more preferably 2.5 mm or less, more preferably 2.0 mm or less in consideration of the reduction in diameter of the catheter body 2. More preferably.
[0026]
The catheter body 2 includes a proximal portion 21 and an intermediate portion 22 that extend substantially linearly from the proximal end side, a first curved portion 31 that is curved at a predetermined angle with respect to the intermediate portion 22, and the first A distal portion 23 that extends substantially linearly from the curved portion 31; a second curved portion 32 that is curved at a predetermined angle with respect to the distal portion 23 in a direction opposite to the first curved portion 31; And a distal end 24 extending substantially linearly from the curved portion 32.
[0027]
The proximal portion 21 and the intermediate portion 22 are substantially straight in a state where no external force is applied (a natural state where no external force such as bending, twisting, pulling, and compression is applied). Note that the proximal portion 21 and the intermediate portion 22 are continuous, there is no boundary between them, and they may be integrated.
[0028]
The length of the proximal portion 21 and the intermediate portion 22, that is, the length from the proximal end of the catheter body 2 to the first curved portion 31, is not particularly limited, but is usually preferably about 450 to 1500 mm, More preferably, it is about 600 to 1200 mm. In the case of children and infants, it may be shorter.
[0029]
The first bending portion 31 is bent (bent) as desired in a state where no external force is applied (a natural state where no external force such as bending, twisting, pulling, and compression is applied). Angle of first curved portion 31 (angle formed by intermediate portion 22 and distal portion 23) θ ₁ Is from 60 to 120 °, preferably from 80 to 100 °, more preferably substantially at right angles. θ ₁ If the angle is less than 60 °, the brachial artery or radial artery may be difficult to insert into the left coronary artery, and if it exceeds 120 °, it is difficult to insert into the left coronary artery, especially from the femoral artery to the left coronary artery. May become difficult.
[0030]
Further, the radius of curvature R of the center line of the first curved portion 31 ₁ Although it is not specifically limited, It is preferable that it is about 1-20 mm, and it is more preferable that it is about 4-10 mm. R ₁ Is too small, the catheter body 2 tends to bend at the first bending portion 31 and the lumen 5 may be blocked. ₁ If it is too large, insertion becomes difficult when the blood vessel diameter is small.
[0031]
The length of the distal portion 23 is not particularly limited, but is preferably about 10 to 50 mm, and more preferably about 20 to 40 mm. If this length is too short, insertion into the left and right coronary arteries may be difficult, and it may be easily removed from the coronary artery opening. If it is too long, insertion into the coronary artery may be too deep.
[0032]
The second bending portion 32 is bent (bent) in the opposite direction to the first bending portion 31 in a state where no external force is applied. Angle of second curved portion 32 (angle formed by distal portion 23 and distal end portion 24) θ ₂ Is from 5 to 45 °, preferably from 20 to 40 °, more preferably from 25 to 35 °. θ ₂ If the angle is less than 5 °, it is difficult to obtain coaxiality with the coronary artery, and if it exceeds 45 °, it is difficult to obtain coaxiality with the coronary artery as in the case of less than 5 °.
[0033]
Also, the radius of curvature R of the center line of the second curved portion 32 ₂ Although it is not specifically limited, It is preferable that it is about 1-20 mm, and it is more preferable that it is about 5-15 mm. R ₂ Is too small, the catheter body 2 is likely to be bent at the second curved portion 32 and the lumen 5 may be blocked. ₁ Is too large, the angle θ of the curved portion 32 ₂ It becomes difficult to make a big angle.
[0034]
The length of the distal end portion 24 is not particularly limited, but is preferably about 1 to 10 mm, and more preferably about 2 to 6 mm. By setting it as such a range, insertion to the left coronary artery or the right coronary artery of the distal end part 24 can be performed suitably.
[0035]
Such a catheter body 2 is constituted by a hollow tube having flexibility and flexibility. As the constituent material of the catheter body 2, for example, various resin materials such as polyamide, polyether polyamide, polyester polyamide, polyester, polyurethane, soft polyvinyl chloride, ABS resin, AS resin, polytetrafluoroethylene and other fluorine-based resins, Various thermoplastic elastomers such as styrene, polyolefin, polyurethane, polyester, polyamide, polybutadiene, trans polyisoprene, fluororubber, chlorinated polyethylene, and more than two of these Combinations (polymer alloys, polymer blends, laminates, etc.) can be mentioned.
[0036]
In addition to the case where the catheter body 2 is composed of one layer, the catheter body 2 may be composed of a laminate in which two or more layers are laminated. Moreover, the reinforcing material may be installed in the layer or between the layers. Examples of the reinforcing material include those composed of a linear body and those composed of a net-like body.
[0037]
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 give more flexibility to the distal end portion of the catheter body 2, for example, of the first curved portion 31, the distal portion 23, the second curved portion 32, and the distal end portion 24. It is possible to reduce the number of layers in at least one portion compared to other portions, to use a more flexible material, or to dispose a reinforcing material only in the portion.
[0038]
Since insertion of the cardiac catheter 1 into the body is performed while confirming the position under fluoroscopy, the constituent material of the catheter body 2 is mixed with an X-ray opaque material (X-ray contrast agent). It is preferable. As the radiopaque material, for example, barium sulfate, bismuth oxide, tungsten, or the like can be used.
[0039]
In addition, such a radiopaque material is not limited to the case where the material is present over the entire length of the catheter body 2, but a part of the catheter body 2, for example, the first curved portion 31, the distal portion 23, the second It may be present in at least one of the curved portion 32 and the distal end 24 of the first portion.
[0040]
A lumen 5 is formed at almost the center of the catheter body 2 over the entire length of the catheter body 2. Lumen 5 is open at the tip of distal end 24.
[0041]
In addition, at least one side hole 6 is provided on the distal end side (second curved portion 32 side) of the distal portion 23. The side hole 6 communicates with the lumen 5.
[0042]
In the illustrated configuration, the two side holes 6 are formed along the longitudinal direction of the catheter body 2, but the arrangement of the side holes 6 is not limited to this, and for example, a plurality of side holes 6 are provided along the circumferential direction of the catheter body 2. Side holes 6 may be formed. The number of side holes 6 formed may be one or three or more. Furthermore, such a side hole 6 may not be formed.
[0043]
The diameter of the side hole 6 is not particularly limited, but is usually preferably about 0.3 to 1.5 mm, more preferably about 0.4 to 1.0 mm, depending on the outer diameter of the catheter body 2.
[0044]
The distal end 24 preferably comprises a soft member 25. Thereby, the damage of the blood vessel by the front-end | tip of the catheter main body 2 can be prevented more reliably at the time of inserting the cardiac catheter 1 into the body. In this case, the entire distal end portion 24 may be made of a soft member, or a part of the distal end portion 24, particularly the tip portion, may be made of a soft member.
[0045]
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, and styrene-butadiene rubber, styrene, polyolefin, polyurethane, and polyester. And various thermoplastic elastomers such as polyamide, polybutadiene, transpolyisoprene, fluororubber, and chlorinated polyethylene.
[0046]
A hub 4 is attached to the proximal end of the catheter body 2. The hub 4 is formed with a lumen communicating with the lumen 5. This lumen has an inner diameter substantially equal to the inner diameter of the lumen 5 and is continuous with the inner surface of the base end portion of the lumen 5 without causing a step or the like.
[0047]
From such a hub 4, for example, a long object (linear body) such as a guide wire, catheters (for example, a PTCA balloon catheter), an endoscope, an ultrasonic probe, a temperature sensor, or the like is inserted, Various liquids such as a contrast medium (X-ray contrast medium), a chemical solution, and physiological saline can be injected or removed. Further, the hub 4 can be connected to other devices at the time of blood pressure measurement, for example.
[0048]
Due to the shape described above, the cardiac catheter 1 as described above can be used by inserting its distal end into each part of the heart, particularly the right coronary artery, the left coronary artery, and the left ventricle. The introduction site of the cardiac catheter 1 into the body can be not only the femoral artery but also the brachial artery or radial artery.
[0049]
Next, an example of a method for using the cardiac catheter 1 of the present invention will be described.
[0050]
As shown in FIG. 2, the catheter introducer 7 is punctured into an artery (introduction site) 9 such as the right upper arm artery, the right radial artery or the right femoral artery by the Seldinger method, and the inside of the sheath 8 of the catheter introducer 7 is inserted. Then, the cardiac catheter 1 of the present invention in which the guide wire 10 is inserted into the lumen 5 is inserted, and the distal end portion 24 is protruded from the distal end opening 81 of the sheath 8 into the artery 9.
[0051]
Next, the cardiac catheter 1 is gradually fed with the guide wire 10 in the direction of the arrow in FIG. 2 and advanced toward the target site (right coronary artery, left coronary artery, left ventricle, etc.). At this time, in order for the distal end portion 24 of the cardiac 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 taken in and out, and the cardiac catheter 1 is advanced / retracted and rotated. Perform an appropriate combination of operations.
[0052]
Hereinafter, an operation (procedure) for inserting the distal end portion of the cardiac catheter 1 into the right coronary artery, the left coronary artery, and the left ventricle will be described in detail with reference to FIGS. In addition, all of these operations are performed while confirming the position and posture of the cardiac catheter 1 under fluoroscopy.
[0053]
1. Insertion into the right coronary artery (mouth) (see Figure 3)
With the catheter introducer 7 inserted into the femoral artery and the guide wire 10 inserted into the lumen 5 of the cardiac catheter 1, the cardiac catheter 1 is inserted into the catheter introducer 7 and thereafter the guide wire 10 is advanced. The distal end of the cardiac catheter 1 is advanced from the abdominal aorta 105 to the ascending aorta 100. Thereafter, the guide wire 10 is removed, and the shape of the cardiac catheter 1 is returned to a pre-shaped curved shape (natural state).
[0054]
Next, the heart catheter 1 is once pushed deeply deeper than the right coronary ostium 101 and close to the aortic valve 102, and the tip of the heart catheter 1 is brought into contact with the right inner wall 103 of the ascending aorta 100 and slowly turned while turning clockwise. When pulled back, the distal end 24 of the cardiac catheter 1 is inserted into the right coronary ostium 101.
[0055]
Similarly, when the catheter introducer 7 is punctured into the brachial artery or radial artery, when the distal end portion of the cardiac catheter 1 passes through the brachiocephalic artery 107 and enters the ascending aorta 100, the progression of the cardiac catheter 1 is stopped and guided. The wire 10 is removed. Thereafter, the same operation as described above is performed, and the distal end portion 24 of the cardiac catheter 1 is inserted into the right coronary artery opening 101.
[0056]
2. Insertion into the left coronary artery (mouth) (see Fig. 4)
With the catheter introducer 7 inserted into the femoral artery and the guide wire 10 inserted into the lumen 5 of the cardiac catheter 1, the cardiac catheter 1 is inserted into the catheter introducer 7 and thereafter the guide wire 10 is advanced. The distal end of the cardiac catheter 1 is advanced from the abdominal aorta 105 to the ascending aorta 100. When the distal end 24 is positioned approximately 10 cm above the left coronary artery opening 106, the progression of the cardiac catheter 1 is stopped, the guide wire 10 is removed, and the shape of the cardiac catheter 1 is pre-shaped (natural state). Return to.
[0057]
Next, when the cardiac catheter 1 is slowly pushed forward while confirming the distal end position of the cardiac catheter 1, the distal end (distal end portion 24) of the cardiac catheter 1 moves downward while contacting the left inner wall 104 of the ascending aorta 100. It is moved and inserted into the left coronary ostium 106.
[0058]
If the distal end (distal end 24) of the cardiac catheter 1 is facing away from the left coronary ostium 106, the cardiac catheter 1 is slightly rotated counterclockwise to cause the distal end 24 to move to the left coronary artery. It is pushed slowly toward the mouth 106 as it is. As a result, the distal end 24 is easily inserted into the left coronary artery opening 106.
[0059]
Similarly, when the catheter introducer 7 is punctured into the brachial artery or radial artery, when the distal end portion of the cardiac catheter 1 passes through the brachiocephalic artery 107 and enters the ascending aorta 100, the progression of the cardiac catheter 1 is stopped and guided. The wire 10 is removed.
[0060]
Next, the cardiac catheter 1 is slowly pushed forward while confirming the distal end position of the cardiac catheter 1. As a result, the distal end portion of the cardiac catheter 1 is inserted into the left coronary artery opening 106 in the same manner as described above.
[0061]
If the distal end (distal end 24) of the cardiac catheter 1 is facing away from the left coronary artery opening 106, the cardiac catheter 1 is slightly rotated counterclockwise to move the distal end 24 to the left. It is pushed slowly toward the coronary artery opening 106 as it is. As a result, the distal end 24 is easily inserted into the left coronary artery opening 106.
[0062]
3. Insertion into the left ventricle (see Fig. 5)
When the catheter introducer 7 is punctured into the brachial artery or radial artery, the guide wire 10 is advanced, and the distal end portion (distal end portion 24) of the cardiac catheter 1 is moved from the subclavian artery to the ascending aorta 100 via the brachiocephalic artery 107. ). 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 back and forth, the distal end portion of the heart catheter 1 passes through the aortic valve 102 and enters the left ventricle 108. Inserted.
[0063]
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 place the cardiac catheter 1 along the abdominal aorta 105 and the aortic arch 109. The distal end portion (distal end portion 24) of the cardiac catheter 1 is positioned at the top. When the heart catheter 1 is gradually advanced toward the center of the apex of the aortic valve 102 and further rotated, while the heart catheter 1 is repeatedly advanced and retracted, the distal end of the heart catheter 1 passes over the aortic valve 102. Inserted into the left ventricle 108.
[0064]
After the distal end 24 of the cardiac catheter 1 is inserted into the target site by the above operation, the guide wire 10 is removed from the lumen 5. When X-ray imaging is performed on a target site using a contrast medium, a contrast medium is injected by connecting a connector to the hub 4. The injected contrast agent passes through the lumen 5 and is ejected from the tip opening of the distal end portion 24 and the side hole 6 and supplied to the target site. Thereby, X-ray imaging of the target part is attained.
[0065]
The use of the cardiac catheter 1 of the present invention is not particularly limited. In addition to the above-described contrast catheter, for example, a balloon catheter, a rotor / brator catheter, an aselecty catheter, an ultrasonic catheter, and the like are introduced. The present invention can be applied to a guiding catheter, a catheter for administering a drug solution (such as a thrombolytic agent), and the like.
[0066]
【Example】
Hereinafter, specific examples of the present invention will be described.
[0067]
Example 1
With the configuration shown in FIG. 1, a cardiac catheter having a catheter body under the following conditions was produced.
[0068]
Total length: 850mm
Outer diameter: 1.67 mm
Inner diameter (lumen diameter): 1.1 mm
Material: Polyether polyamide
Angle θ of the first curved part ₁ : 90 °
Radius of curvature R of the first curved portion ₁ : 5.0mm
Distal length: 30 mm
Angle θ of the second curved portion ₂ : 30 °
Radius of curvature R of the second curved portion ₂ : 10mm
Distal end length: 3 mm
Side hole formation position: 2 at the tip of the distal part at intervals of 5.0 mm
Side hole diameter: 0.5 mm
Installation of soft member: A soft tip made of polyamide elastomer is installed at the tip of the distal end.
[0069]
<Clinical trial 1>
By the above-described procedure, a catheter introducer having a 5F (French) sheath is placed percutaneously in the right upper arm artery for three patients A, B and C, and the cardiac catheter is introduced from the sheath. And inserted into the blood vessel. Thereafter, the distal end portion of the cardiac catheter was sequentially inserted into the right coronary artery, the left coronary artery and the left ventricle, and X-ray contrast medium was injected to perform X-ray contrast. Obtained.
[0070]
With one type of cardiac catheter, the tip of the catheter could be inserted quickly, safely and reliably into each of the right coronary artery, left coronary artery and left ventricle, and X-ray imaging could be performed.
[0071]
<Clinical trial 2>
Through the procedure described above, a catheter introducer with a 5F (French) sheath is placed percutaneously in the right radial artery for the three patients D, E and F, and the cardiac catheter is introduced from the sheath. And inserted into the blood vessel. Thereafter, the distal end portion of the cardiac catheter was sequentially inserted into the right coronary artery, the left coronary artery and the left ventricle, and X-ray contrast medium was injected to perform X-ray contrast. Obtained.
[0072]
With one type of cardiac catheter, the tip of the catheter could be inserted quickly, safely and reliably into each of the right coronary artery, left coronary artery and left ventricle, and X-ray imaging could be performed.
[0073]
<Clinical trial 3>
By the above-described procedure, a catheter introducer having a 5F (French) sheath is placed percutaneously in the right femoral artery for three patients G, H, and I, and the cardiac catheter is introduced from the sheath. And inserted into the blood vessel. Thereafter, the distal end portion of the cardiac catheter was sequentially inserted into the right coronary artery, the left coronary artery and the left ventricle, and X-ray contrast medium was injected to perform X-ray contrast. Obtained.
[0074]
With one type of cardiac catheter, the tip of the catheter could be inserted quickly, safely and reliably into each of the right coronary artery, left coronary artery and left ventricle, and X-ray imaging could be performed.
[0075]
(Example 2)
A cardiac catheter similar to that of Example 1 was produced except that the following conditions were different.
[0076]
Angle θ of the first curved part ₁ : 85 °
Radius of curvature R of the first curved portion ₁ : 10mm
Distal length: 35 mm
Angle θ of the second curved portion ₂ : 27 °
Radius of curvature R of the second curved portion ₂ : 15mm
Distal end length: 4 mm
[0077]
When clinical trials similar to clinical trials 1, 2, and 3 were conducted on a total of 9 other patients, the right coronary artery, left coronary artery, and left coronary artery were used in each clinical trial as described above with one type of cardiac catheter. For each of the left ventricle and the left ventricle, the catheter tip was inserted quickly and safely, and X-ray imaging could be performed.
[0078]
【The invention's effect】
As described above, according to the present invention, it is possible to deal with different target sites such as the right coronary artery, the left coronary artery, and the left ventricle, and various blood vessel shapes with one type of catheter.
[0079]
Therefore, for example, when inserting the catheter tip into two or more target sites to inject or treat an X-ray contrast medium, it is not necessary to replace the cardiac catheter for each target site, and the time and effort of the operation are eliminated. , Can greatly reduce the burden on patients.
[0080]
Moreover, the cardiac catheter of the present invention has a wide range of selection of the introduction site into the body. For example, not only the femoral artery but also the brachial artery or radial artery can be introduced into the body.
[0081]
Therefore, there is little bleeding at the puncture site after the operation, and the patient is not forced to rest and can walk, thereby reducing the patient's pain and burden. It is also highly safe and can prevent postoperative infections (such as urinary tract infections associated with urination in the supine position).
[0082]
Further, since the cardiac catheter of the present invention is excellent in operability, it is easy to perform an introduction operation into the body, in particular, an operation for transferring and inserting the distal end portion of the catheter to a target site, and to perform the operation safely. Can do.
[0083]
In addition, since it has a sufficient repulsive force, the posture of the catheter is stably maintained even after the catheter tip is once inserted into the target site, so that the catheter tip may deviate from or shift from the target site. hard. Therefore, contrast, treatment, etc. can be sufficiently continued.
[0084]
Also from such a thing, the effort and time which surgery requires can be reduced, and a patient's burden can be eased.
[Brief description of the drawings]
FIG. 1 is a plan view showing the overall shape of a cardiac catheter of the present invention.
FIG. 2 is an explanatory view showing a method for introducing a cardiac catheter of the present invention into a blood vessel.
FIG. 3 is an explanatory view schematically showing a method of use when the cardiac catheter of the present invention is inserted and placed in the right coronary artery.
FIG. 4 is an explanatory view schematically showing a method of use when the cardiac catheter of the present invention is inserted and placed in the left coronary artery.
FIG. 5 is an explanatory view schematically showing a method of use when the cardiac catheter of the present invention is inserted and placed in the left ventricle.
[Explanation of symbols]
1 cardiac catheter
2 Catheter body
21 Proximal part
22 Middle part
23 Distal part
24 Distal end
25 Soft materials
31 1st bending part
32 2nd bending part
4 Hub
5 lumens
6 side holes
7 Catheter introducer
8 sheath
81 Tip opening
9 Arteries
10 Guide wire
100 Ascending aorta
101 Right coronary artery
102 Aortic valve
103 Right inner wall
104 left inner wall
105 Abdominal aorta
106 Left coronary artery ostium
107 brachiocephalic artery
108 Left ventricle
109 Aortic arch

Claims (5)

A tube-shaped cardiac catheter having flexibility,
A generally straight proximal and intermediate portion;
A first curved portion curved at an angle of 85 ° to 90 ° with respect to the intermediate portion;
A distal portion extending generally linearly from the first curved portion;
A second curved portion curved in an opposite direction to the first curved portion and at an angle of 27 ° to 30 ° with respect to the distal portion;
A distal end extending substantially linearly from the second curved portion,
The radius of curvature of the center line of the first curved portion is 5.0 mm to 10 mm ,
The radius of curvature of the center line of the second curved portion is 10 mm to 15 mm ,
A cardiac catheter which is introduced from the right upper arm artery, right radial artery or right femoral artery and can be inserted into the right coronary artery, the left coronary artery and the left ventricle. The cardiac catheter according to claim 1 , wherein the distal portion has a length of 30 mm to 35 mm . The cardiac catheter according to claim 1 or 2 , wherein the length of the distal end portion is 3 mm to 4 mm . The cardiac catheter according to any one of claims 1 to 3 , wherein at least one side hole is provided on the second curved portion side of the distal portion. The cardiac catheter according to any one of claims 1 to 4 , wherein the distal end portion includes a soft member.

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