JP2009268648A - Medical catheter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a medical catheter which includes flexibility by suppressing the rigidity of a portion of an imaging marker and which includes X-ray imaging property easy to confirm. <P>SOLUTION: The medical catheter 10 is provided with a flexible tube having lumen being continuous from a proximal end to a distal end. At the distal end of the flexible tube, an imaging marker member 1 provided with thin-width annular section on both sides of a separation section having a predetermined width is arranged. The imaging marker member 1 is composed of two ring-like X-ray impermeable metallic member installed separated with a predetermined interval therebetween. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a medical catheter, and more particularly to a medical catheter provided with a contrast marker.

  Conventionally, medical actions such as injecting medicinal solutions and nutrients into blood vessels, collecting blood for inspection, and dialysis by circulating blood outside the body via catheters inserted and placed in blood vessels In addition, medical practices such as treatment of blood vessels and the heart using the inserted and placed catheters are performed.

  In addition, when using a medical catheter to be inserted into a living body, it is desirable to perform a medical practice while confirming the position in the living body. An X-ray opaque contrast marker is attached to the catheter and the catheter is attached. There is one that can confirm the indwelling position in the living body. With this configuration, the position of the catheter can be confirmed by projecting the X-ray-irradiated portion with the X-ray-opaque contrast marker attached while the catheter is placed in the patient's blood vessel.

  However, when penetrating into a blood vessel, it is preferable to have the following ability to easily bend following the bent blood vessel and the insertion property to facilitate insertion into the blood vessel. Furthermore, it is preferable to attach a contrast marker having a predetermined width for contrast.

  In addition, since the metal production shadow marker molded in a coil shape is more elastic and follows the ring shape than the metal production shadow marker in the form of a ring, a portion of the catheter made of a flexible plastic tube is attached with X. A device equipped with a coiled contrast marker made of a radiopaque material has already been published (see, for example, Patent Document 1).

Furthermore, a contrast marker made of a radiopaque metal by processing a plate-like core material into a coil shape has already been disclosed (for example, see Patent Document 2).
JP 2006-271901 A JP 2005-278905 A

However, in the case of a catheter in which a ring-shaped contrast marker having a wide width is attached to the outside of the tube, the rigidity of the portion of the contrast marker becomes high, and there is a problem that the passage through the lesioned part is inferior.
Moreover, even if it is a flexible coil-shaped contrast marker, if the coil part is long, blood vessel followability will deteriorate and the lesion part permeability will be inferior.

  In view of the above problems, an object of the present invention is to provide a medical catheter which has flexibility by suppressing the rigidity of a contrast marker portion to be low and has an X-ray contrast property that can be easily confirmed.

  In order to achieve the above object, the present invention provides a medical catheter including a flexible tube having a lumen continuous from a proximal end portion to a distal end portion, wherein the distal end portion of the flexible tube has a predetermined width. A contrast marker member having narrow annular portions on both sides of the spaced-apart portion is disposed.

  If it is said structure, since the both sides which pinched | interposed the center separation | spacing part become a contrast part, even if the contrast part is narrow, two contrast parts will have a predetermined space | interval when X-rays are irradiated Will be visually recognized. For this reason, even if the contrast when a single contrast portion is irradiated with X-rays is thin, two of them are visually recognized at a predetermined interval, so that X-ray contrast properties that are easy to confirm are exhibited. Furthermore, since the narrow annular portions are separated by a predetermined width, the rigidity of the contrast marker portion is suppressed to be low and the flexibility is provided.

  According to the present invention, in the medical catheter configured as described above, the contrast marker member can be formed of two ring-shaped radiopaque metal members that are spaced apart from each other by a predetermined distance. According to this configuration, even if a ring-shaped contrast marker member is used, the width can be reduced, so that blood vessel follow-up does not deteriorate.

  Further, the present invention is the medical catheter having the above-described configuration, wherein the contrast marker member has a shape in which a center portion of a ring-shaped radiopaque metal member having a predetermined width is excised and a narrow annular portion is left on both sides, and It can be set as the shape connected at one place or two places on the circumference. According to this configuration, the contrast marker member is an integrated contrast marker member that exhibits easy contrast at the annular portions on both sides sandwiching the central portion from which a part is excised, so that the contrast marker is placed at a predetermined position of the flexible tube. The members can be easily installed and molded integrally.

  Furthermore, in the medical catheter having the above-described configuration, the present invention can provide a tapered portion at the distal end portion of the flexible tube, and the contrast marker member can be disposed immediately after the tapered portion. With this configuration, the catheter can be easily inserted into the living body, and the catheter is inserted while checking immediately after the tapered portion, so that it can be safely inserted to a desired position without applying excessive force, and the position in the living body can be determined. It can be reliably detected.

  Further, according to the present invention, in the medical catheter configured as described above, a contrast agent can be blended in the tapered portion. According to this configuration, the tip position of the catheter can be further easily confirmed by visually recognizing the tapered tip portion.

  According to the present invention, the contrast marker member having the narrow annular portions on both sides of the distal end portion of the flexible tube with the spacing portion of the predetermined width interposed therebetween can be used without increasing the rigidity. It is possible to obtain a medical catheter that exhibits flexibility and exhibits easily confirmed contrast.

  Hereinafter, embodiments of a medical catheter according to the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 2, a medical catheter 10 according to the present invention includes a catheter tube 2, which is a flexible tube having a lumen continuous from a proximal end portion to a distal end portion, a protective shaft 3, and a connector 4, and includes a chemical solution. It is a tube-shaped medical device for administration, thrombus aspiration and the like.

  The catheter tube 2 is a tube having a small diameter so as to be inserted into a patient's body, particularly into a blood vessel. For example, the outer diameter of the catheter tube 2 is set to about 0.4 to 3.0 mm. It is about 3 to 2.8 mm. Moreover, the length needs to be the length from the insertion port of a patient's blood vessel to a treatment site | part, for example, is about 300-1600 mm. In addition, the tip of the catheter tube 2 is elastic and a tapered tip 5 is attached to facilitate insertion into the body or blood vessel.

  Since the catheter tube 2 needs flexibility and biocompatibility, it is formed of a synthetic resin such as polyurethane, polyethylene, polyester, polypropylene, polyamide, polytetrafluoroethylene, polyvinylidene fluoride, and the like. For example, a blade tube having a laminated structure of an inner layer tube and an outer layer tube can also be employed.

  A contrast marker member 1 is disposed at the distal end of the catheter tube 2. In this case, in order to confirm the position of the catheter tube 2 inserted into the body from the outside of the body, a contrast marker made of a radiopaque metallic material is attached to a predetermined position at the distal end of the tube. With this configuration, when X-rays are irradiated while the catheter is inserted and placed in the patient's body, it is displayed on the X-ray opaque contrast marker display screen, and the catheter placement position can be easily confirmed from outside the body. Can do.

  The contrast marker member 1 can be made of a radiopaque metal such as platinum, gold, tungsten, titanium, aluminum, tin, nickel, chromium, bismuth, copper, zinc, lead, iridium, or an alloy thereof. In particular, from the viewpoint of the safety to the living body and the contrast effect by X-ray irradiation, it is preferable to be made of platinum as much as possible.

  However, since the contrast marker member 1 is made of metal, if the width thereof is large, the contrast marker portion has high rigidity, and the flexibility is deteriorated. It is better to have a wide width in order to exhibit contrast, but when inserting into a blood vessel, the tube is flexible so that it can be easily bent by reducing its width and easily follow a tortuous blood vessel shape. It is preferable to exhibit.

  Therefore, in the present embodiment, a contrast marker member having narrow annular portions on both sides of the distal end portion of the flexible catheter tube 2 with a spacing portion having a predetermined width is disposed. The embodiment will be described with reference to FIG.

  A contrast marker member 1A of the first embodiment shown in FIG. 1A includes a contrast marker 11 made of two ring-shaped radiopaque metal members that are spaced apart from each other by a predetermined distance. With this configuration, in this example, the width H2 of each contrast marker 11 is set to be smaller than 1/3 of the width H1 with respect to the conventionally used width H1 of the ring-shaped contrast marker. In addition, since a resin tube is present between the pair of annular contrast markers 11 on both sides, flexibility is exhibited accordingly.

  In addition, even if the width H2 of each annular contrast marker 11 is small, a pair of them are arranged at a predetermined interval, so that when two X-rays are irradiated, two contrast portions are visually recognized with a predetermined interval. Thus, even if contrast is thin when one contrast unit irradiates X-rays, two images are visually recognized at a predetermined interval, so that X-ray contrast properties that are easy to confirm are exhibited.

  The contrast marker member 1B of the second embodiment shown in FIG. 1 (b) has a shape in which a center portion of a ring-shaped radiopaque metal member having a predetermined width is excised, leaving narrow annular portions on both sides, and It is an example of a shape connected at one or two places on the circumference, and is provided with a connecting portion 12 that connects the annular contrast markers 11 having a width H2 of 1/3 or less of the entire width H1.

  The connecting portion 12 is provided at one or two locations on the circumference so that the rigidity of the contrast marker portion does not increase. Even with such a shape, the entire width H1 is much easier to bend than a metal contrast marker.

  The contrast marker member 1C of the third embodiment shown in FIG. 1 (c) has a shape in which a center portion of a ring-shaped radiopaque metal member having a predetermined width is cut away and narrow annular portions are left on both sides, and It is another embodiment made into the shape connected in one place or two places on the circumference, Comprising: It is the example which connected the X-ray impermeable metal members of both sides via the connection part 13 of triangular plate shape. Even in this case, it is possible to reduce the rigidity by setting the width H2 of the contrast markers 11a on both sides to be 1/3 or less of the entire width H1, and providing a separation portion having a predetermined width therebetween.

  Also in this embodiment, the connection part 13 may be one place or two places on the circumference, and can be changed according to required flexibility. Even with this shape, it is clear that the full width H1 is easier to bend than the metal contrast marker.

  In addition, it is clear and effective that even a configuration in which two or more annular contrast markers 11 having a small width are provided exhibits a certain degree of blood vessel tracking. However, it is preferable as a medical catheter that requires high followability because it can easily confirm X-ray contrast with a simple configuration in which one or two narrow annular contrast markers 11 are provided.

  Further, the position of the parallel portion connected to the tapered portion is confirmed by arranging the contrast marker member immediately after the distal tip 5 which is a tapered portion that facilitates insertion into the body or blood vessel. Therefore, it is possible to safely detect the position in the living body and reliably detect the position in the living body without applying excessive force.

  Further, since the tip 5 is made of a resin having elasticity such as a polyamide resin as in the case of the outer layer tube described above, it can be molded integrally with a contrast agent. In this way, by adding the contrast agent to the tapered portion, the tapered tip portion can be visually recognized, and the catheter is placed with the tapered tip portion position and the two annular contrast markers 11. It becomes easier to confirm the position.

  Examples of the contrast agent blended in the tip 5 made of polyamide resin include barium sulfate, bismuth oxide, and bismuth subcarbonate. Further, the blending amount thereof may be any appropriate amount, for example, about 5 to 60%. The above-mentioned contrast agent is generally in the form of powder, and when blended in the resin, the resin tends to become hard. Therefore, a softer tip is required depending on the elasticity of the resin used and the softness allowed for the tip 5. If a small amount of the catheter is used and a slightly harder tip is acceptable, this amount can be increased.

  As described above, the medical catheter 10 according to the present invention is provided with the contrast marker member 1 having narrow annular portions on both sides of the distal end portion with the spacing portion having a predetermined width interposed therebetween. It becomes a medical catheter that exhibits flexibility without being raised and exhibits easy-to-confirm contrast.

  Furthermore, a tapered taper portion is provided, a contrast agent is blended in the taper portion, and a contrast marker member is disposed immediately after the taper portion, so that it can be introduced into the living body or blood vessel via the tapered taper portion. Insertion is facilitated, and the tip end position of the catheter is further easily confirmed by visually recognizing the tapered tip portion and the two contrast marker members immediately thereafter.

  As described above, according to the present invention, the contrast marker member having the narrow annular portions on both sides of the flexible tube with the spacing portion of the predetermined width sandwiched between the distal ends of the flexible tube is attached. It is possible to obtain a medical catheter which exhibits a line contrast and is flexible as a whole without increasing the rigidity of the tube.

It is the principal part enlarged view of the medical catheter which concerns on this invention, Comprising: (a) shows the principal part with which the contrast marker member 1A of 1st embodiment was mounted | worn, (b) is the contrast marker member of 2nd embodiment. 1B shows the main part with which 1B was mounted | worn, (c) shows the main part with which the contrast marker member 1C of 3rd embodiment was mounted | worn. 1 is an overall side view of a medical catheter according to the present invention.

Explanation of symbols

1 Contrast Marker Member 1A Contrast Marker Member (First Embodiment)
1B Contrast Marker Member (Second Embodiment)
1C Contrast marker member (third embodiment)
DESCRIPTION OF SYMBOLS 2 Catheter tube 3 Protection shaft 4 Connector 5 Tip tip 10 Medical catheter 11 Contrast marker 12 Connection part 13 Connection part

Claims (5)

  A medical catheter comprising a flexible tube having a lumen continuous from a proximal end portion to a distal end portion, wherein a narrow annular portion is formed on both sides of the distal end portion of the flexible tube with a spacing portion having a predetermined width therebetween A medical catheter comprising a contrast marker member comprising:   2. The medical catheter according to claim 1, wherein the contrast marker member includes two ring-shaped radiopaque metal members that are spaced apart from each other by a predetermined distance.   The contrast marker member has a shape in which a center part of a ring-shaped radiopaque metal member having a predetermined width is cut out and a narrow annular part is left on both sides, and is connected at one or two places on the circumference. The medical catheter according to claim 1, wherein the medical catheter is shaped.   The medical catheter according to any one of claims 1 to 3, wherein a tapered portion is provided at a distal end portion of the flexible tube, and the contrast marker member is disposed immediately after the tapered portion. .   The medical catheter according to claim 4, wherein a contrast agent is blended in the tapered portion.

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