JP2003190289A - catheter - Google Patents

Abstract

(57) [Problem] To provide a catheter which can perform imaging of left and right coronary arteries and the like with a single catheter. An end tube (14) is provided with an inner tube (12) formed in a substantially "?" Shape and an outer tube (20) mounted on the inner tube (12) so as to be movable in the axial direction. When moved axially to the side 14, most of the bent portion on the root side of the distal end portion 14 is deformed and accommodated in the outer tube 20, and the shape of the distal end portion 14 extending from the outer tube 20. The catheter was designed to make a right curve for Judkins.

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a catheter, and more particularly, to a catheter for imaging which is used for both left and right coronary arteries. 2. Description of the Related Art Conventionally, as a catheter of this type, for example, there is a catheter described in Japanese Patent Application Laid-Open No. Hei 4-231068. In this catheter, the curved shape of the distal end portion is variable, and the distal end portion can be easily inserted into the left and right coronary arteries by appropriately rotating. [0003] However, in this catheter, when approaching the right coronary artery,
It is hard to say that the outer shell of the tip follows the curve of the inner surface of the blood vessel, and from the viewpoint of the completeness of the operation of the catheter,
Further improvement was requested. [0004] It is an object of the present invention to provide a catheter capable of meeting such a demand. [0005] Technical means taken to solve the above-mentioned problems include an inner tube having a substantially semicircular bent portion at a tip end thereof, and an axial tube moving on the inner tube. An outer tube mounted so as to be capable of being mounted, and when the outer tube is axially moved toward the distal end portion, most of the bent portion on the root side of the distal end portion is deformed and accommodated in the outer tube. The catheter is configured such that the shape of the accommodated portion and the distal end extending from the outer tube is a Judkins right curve as a whole. According to the above-described means, the outer tube is axially moved so that most of the bent portion on the root side of the distal end portion is deformed and accommodated in the outer tube, so that the outer tube is deformed into a Judkins right curve. it can. Thus, a single catheter can be properly introduced into the left and right coronary arteries, as in the past,
There is no need to prepare catheters for both the left coronary aorta and the right coronary aorta, which were inevitable when employing the Judkins method, and left and right coronary arteriography can be easily performed. An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, a catheter 10 has an inner tube 12. Tip 14 of inner tube 12
As described later, is formed in a substantially semi-circular arc shape or in a substantially "?" Shape (habit forming), and this shape or profile is set so as to be able to approach the left coronary artery.
The main body 16 of the inner tube 12 passes through the outer tube 20 and reaches the inside of the hub 22.
Are fixed to the hub 22. As shown in FIG. 3, a predetermined distance is defined between the main body 16 of the inner tube 12 and the inner surface of the outer tube 20, so that interference between the two is prevented. An X-ray opaque agent is kneaded in the inner tube 12, which facilitates confirmation of the position of the catheter and other operations under X-ray fluoroscopy. The hub 22 is fixed to the base end of a tubular block 24 externally inserted into the outer tube 20. A grip 30 is mounted on the tubular block 24. As shown particularly clearly in FIG. 4, the grip 30 includes an outer tubular portion 32 provided on the tubular block body 24,
Inner tube portion 34 externally integrated with outer tube 20
And a pair of connecting portions 36, 36 connecting the outer tubular portion 32 and the inner tubular portion 34, are integrally formed of resin. Thus, the pair of connecting portions 36 of the grip 30 are loosely fitted in the pair of axial grooves 26 formed in the block body 24, and move the grip 30 along the axial direction of the block body 24. When this is done, the outer tube 20 moves in the left-right direction in FIG. The proximal end 16 of the inner tube 12 is connected to a syringe (not shown).
For example, an infusion agent can be injected into the inner passage of the inner tube 12, or blood can be collected via the inner tube 12. Further, a strain relief 40 is fixed to the tip of the block body 24. The outer tube 20 is inserted through the strain relief 40 for axial movement. During the operation of the catheter, the strain relief 40 causes bending stress accompanying the catheter operation (push / pull and torque transmission of the catheter) from the cylindrical block body 24 formed of a hard material to the outer tube 20 formed of a soft material. And the outer tube 20 is a cylindrical block body 2.
This is to prevent kinking or damage at the tip of No. 4. The distal end portion 14 of the inner tube 12 will be described in detail. Tip 14 of inner tube 12
Is bent into a “?” Shape so that it can approach the left coronary artery. Thus, the “?” Shape is formed by a curved portion 141 extending from the straight portion 16 and offset so as to form a か ら arc from the axis of the straight portion 16, and an axis of the straight portion 16 further from the curved portion 141. A pseudo semi-arc-shaped bent portion 142 extending to a position just before the extension of the axis of the straight portion 16 after being offset from the extension, and extending straight from the bent portion 142 to extend the axis of the straight portion 16. Linear part 143 that intersects the line at right angles
A long tube portion 144 that extends from the tip of the straight portion 143 so as to bend toward the axis of the straight portion 16, and the soft tip 1 fixed to the tip of the long tube portion 144.
45. The soft tip 145 is made of a more flexible material than the long tube portion 144, and prevents damage to the left and right coronary arteries. When the grip 30 is operated to the left in the state shown in FIG. 1, the outer tube 20 moves forward along the inner tube 10 toward the distal end portion 14. Since the distal end portion 14 of the inner tube 10 is formed in a “?” Shape, the inner tube 10 is bent and housed in the outer tube 20 in a flattened form with the advancement of the outer tube 20. As shown in FIG. 2, the tip portion 14 exhibits a Judkins right curve. Specifically, when the catheter 10 is inserted into the arch aorta 90 by a well-known method, and the shape of the distal end portion 12 of the inner tube 10 assumes a “?” Shape, FIG.
When the shape of the distal end portion 12 of the inner tube 10 exhibits a Jatkins right curve, the right coronary artery 94 is imaged in a manner as shown in FIG. Thus, the transition from the embodiment of FIG. 5 to the embodiment of FIG. 6 (transition from the embodiment of FIG. 6 to the embodiment of FIG. 5)
It can be performed by an axial operation and a rotation operation of the grip 30. The catheter 10 can also measure blood pressure by attaching a sensor.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view of a catheter according to one embodiment of the present invention. FIG. 2 is an explanatory diagram when the distal end of the catheter shown in FIG. 1 shows a Judkins right curve. FIG. 3 is a sectional view taken along line AA of FIG. FIG. 4 is a sectional view taken along line BB of FIG. 1; FIG. 5 is an explanatory diagram showing a state where the catheter shown in FIG. 1 is inserted into a left coronary artery. FIG. 6 is an explanatory view showing a state where the catheter shown in FIG. 2 is inserted into a right coronary artery. [Description of Signs] 12 Inner tube 14 Tip portion 142 Bend portion 20 Outer tube

Claims (1)

Claims: 1. An inner tube including a bent portion having a substantially semicircular arc shape at a distal end portion, and an outer tube mounted on the inner tube so as to be movable in an axial direction on the inner tube. When moved in the axial direction toward the distal end portion, most of the bent portion on the base side of the distal end line is deformed and stored in the outer tube, and the stored portion and the distal end extending from the outer tube. A catheter having a Judkins right curve as a whole.