JP2005278905A - Contrast marker and catheter - Google Patents

Abstract

To provide a contrast marker and a catheter having a much larger core volume and excellent in both contrast and blood vessel followability.
A contrast marker made of a radiopaque metal, the contrast marker comprising a coil portion (13) formed by processing a plate-like core material into a coil shape and only by pitch winding. A contrast marker made of a radiopaque metal, a plate-shaped core material is processed into a coil shape, and a coil portion (13A) is formed by a pitch winding portion (P) and a close-contact winding portion (M). A contrast marker (11A) in which a tightly wound portion (M) is formed on both sides of the wound portion (P).
[Selection] Figure 1

Description

  The present invention relates to an improvement in the form of a radiopaque imaging marker attached to a catheter tube (including an inner tube and a guide wire tube), for example, a catheter such as a brain catheter or a microcatheter, or a percutaneous coronary artery. The present invention relates to an improvement of a balloon catheter used for angioplasty (PTCA) or the like. In the present invention, the catheter includes a balloon catheter.

  For example, Patent Document 1 (Japanese Patent Publication No. 4-10830) describes that a coiled tightly wound body is mounted as a reinforcing body and marker on the outer circumference of a guide wire tube of a balloon catheter. However, since it is difficult to attach the coiled tightly wound body to the outer periphery of the guide wire tube, in the currently marketed balloon catheter, it is attached to the outer periphery of the guide wire tube together with the plastic tube. However, these reinforcing bodies and markers place importance on the role as a reinforcing body, and the entire coil is bonded or covered with a plastic tube, so the spring action of the coil itself is offset, and the bonded portion is hard and difficult to deform. As shown in FIG. 6, the coiled tightly wound body 73 (64 in the figure is a plastic tube) has a problem that it is difficult to pass through the blood vessel by using the guide wire GW (the blood vessel followability is poor). .

Therefore, the applicant has proposed an invention of a coil marker formed in Patent Document 2 (Japanese Patent Laid-Open No. 2002-204832) by pitch winding (winding with a predetermined pitch interval between the coils). Since it is formed from a thin wire having a diameter of 0.01 to 0.06 mm (also referred to as a “round wire” because the cross section is circular), the contrast is not always good.
Therefore, as a result of intensive studies to solve the above problems, the present inventor has reached the following invention.

No. 4-10830 JP 2002-204832 A

  The problem to be solved by the present invention is that if priority is given to the contrast and the function as a reinforcing body, the spring action of the coil itself is offset and the blood vessel followability is lowered. If priority is given, contrast is lowered.

Therefore, as a result of intensive studies to solve the above problems, the present inventor has reached the following invention.
[1] The present invention is a contrast marker made of a radiopaque metal,
A contrast-enhanced marker (11) comprising a coil portion (13) formed only by pitch winding by processing a plate-like core material into a coil shape is provided.
[2] The present invention is a contrast marker made of a radiopaque metal, wherein a plate-like core material is processed into a coil shape, and a coil portion (P) and a tightly wound portion (M) are used to form a coil portion ( 13A) is provided, and a contrast marker (11A) is provided in which a tightly wound portion (M) is formed on both sides of the pitch wound portion (P).
[3] The present invention provides the contrast marker (11, 11A) according to [1] or [2], wherein the cross section is formed in a rectangular cross section.
[4] The present invention provides a catheter (1, 1A) in which the contrast marker (11, 11A) according to [1] to [3] is mounted on the outer periphery of the catheter tube.

By processing the plate-shaped core material into a coil shape and forming the coil portions 13 and 13A (P) by pitch winding, (1) the core material of the round wire as described in Patent Document 1 and Patent Document 2 Since the volume of the core material is much larger than the formed marker, the contrast is surely improved.
(2) The blood vessel followability is much improved as compared with the marker described in Patent Document 1.
(3) It is a marker excellent in both performance of contrast and blood vessel tracking.

1 and 2 are schematic views of the contrast markers 11 and 11A of the present invention [(A) is a side view, (B) is a cross-sectional view], and FIG. 3 shows the contrast marker 11 of the present invention as a catheter tube 3 (inner It is the schematic of the place where it mounted | worn to the catheter tube 3 also including the tube for tubes or a tube for guide wires below.
[Contrast marker 11]
As illustrated in FIG. 1, the contrast marker 11 is made of a radiopaque metal, and a plate-like core material (also referred to as “square line” because the cross section is rectangular) is processed into a coil shape and pitch-wound ( The coil portion 13 is formed only with a predetermined pitch interval PD between the coils.
[Contrast marker 11A]
The contrast marker 11A is a contrast marker made of a radiopaque metal, as illustrated in FIG. 2, and a plate-like core material is processed into a coil shape. 13A is formed, and tightly wound portions M are formed on both sides of the pitch winding portion P.
As shown in FIG. 2, the pitch winding portion P is disposed in the intermediate portion, and the tightly wound portions M are disposed on both sides thereof, thereby imparting torque characteristics to the intermediate portion.
When the contrast markers 11 and 11A are attached to the catheter tube 3, they can be fixed by heat welding or caulking to the tube or injecting an adhesive. When the plate-shaped core material (square line) constituting the contrast markers 11 and 11A is heat-welded to the catheter tube 3, at least half of the cross-section of the plate-shaped core material (square line) What is necessary is just to embed in a wall surface.

  As the radiopaque metal, a metal material such as a platinum-nickel alloy or gold, platinum, tantalum, tungsten, iridium, rhenium, lead, or an alloy of these materials is used. The contrast markers 11 and 11A can be manufactured by cutting so that the total length is 0.05 to 5.00 mm. The width of the plate-like core material (square wire) constituting the coil is preferably 0.02 to 1.50 mm and the thickness is 0.02 to 0.10 mm. In the contrast marker 11A of the present invention, the number of closely wound coils may be two or more, and three is most preferable. Further, the pitch interval PD of the pitch winding coil is preferably 0.15 mm or less, preferably 0.12 mm or less, more preferably 0.08 mm or less.

The contrast markers 11 and 11A of the present invention are used by being attached to a so-called over-the-wire type balloon catheter 1 illustrated in FIG. 4 and a so-called rapid exchange type balloon catheter 1A illustrated in FIG.
One, preferably two, of the contrast markers 11 and 11A of the present invention are attached to the outer periphery of the inner tube 3 (having a guide wire lumen, also referred to as a guide wire tube) of the balloon catheter 1 or 1A.

[Example of use]
As illustrated in FIG. 3, when the balloon catheter 1 is inserted into a curved blood vessel, the inner tube 3 is bent, but the contrast marker 11 is formed with a predetermined pitch interval PD. Can be easily bent following the inner tube 3.

Schematic diagram of contrast marker 11 of the present invention [(A) is a side view, (B) is a cross-sectional view] Schematic diagram of contrast marker 11A of the present invention [(A) is a side view, (B) is a cross-sectional view] Schematic of the state where the contrast marker 11 of the present invention is attached to the catheter tube 3 Schematic of a balloon catheter equipped with the contrast markers 11 and 11A of the present invention Schematic of a balloon catheter equipped with the contrast markers 11 and 11A of the present invention Schematic of a conventional contrast marker mounted on a catheter tube

Explanation of symbols

1A balloon catheter 2 shaft 3 catheter tube (inner tube)
5 Balloon 6 Connector 7, 7A Opening 8, 9
11, 11A Contrast marker 13, 13A Coil portion P Pitch winding portion PD Pitch interval M Adhesion winding portion SP Gap between coils

Claims (4)

A contrast marker made of a radiopaque metal,
A contrast marker (11) comprising a coil portion (13) formed by processing a plate-shaped core material into a coil shape and only by pitch winding.   A contrast marker made of a radiopaque metal, a plate-shaped core material is processed into a coil shape, and a coil portion (13A) is formed by a pitch winding portion (P) and a close-contact winding portion (M). A contrast marker (11A) characterized in that a tightly wound portion (M) is formed on both sides of a wound portion (P).   The contrast marker (11, 11A) according to claim 1 or 2, wherein the cross section is formed in a rectangular cross section.   A catheter (1, 1A), wherein the contrast marker (11, 11A) according to any one of claims 1 to 3 is mounted on the outer periphery of the catheter tube.

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