JP2021159087A - Tip component for catheter and catheter with tip component for catheter - Google Patents

Abstract

To provide a tip component for catheters capable of effectively penetrating into especially an obstructed area and a narrow area with a hardened thrombus by being attached to a catheter tip, and catheter with the tip component for catheters.SOLUTION: A tip component 100 for catheters according to the present invention includes a penetration part 20 to be attached to a tip of a catheter 200 and formed into a tapered shape tapered toward the tip, and an attachment part 30 provided at a rear end side of the penetration part 20 to be used for attaching the catheter 200. The penetration part 20 is characterized by having a plurality of recessed grooves 25 on the surface.SELECTED DRAWING: Figure 3

Description

The present invention relates to a catheter tip component and a catheter comprising a catheter tip component.

As a treatment method for a thrombotic occlusion site or a stenosis site such as a coronary artery occlusion of the heart or an occlusion of a limb blood vessel, for example, a guide wire is inserted into a blood vessel, introduced to the treatment site, and penetrates the occlusion site or the stenosis site. A treatment method is performed in which a balloon catheter or the like is placed, the balloon is expanded to expand the occluded site or the stenotic site, and a stent is placed at the site as needed.

However, if the occluded portion or the stenotic portion is left for a long period of time after being formed, it may become hardened to the extent that a normal guide wire cannot be penetrated. When such a state is reached, it becomes difficult for the guide wire or balloon catheter to penetrate the occluded site or the stenotic site. A hollow needle with a sharp tip is used as a means for passing through such a hardened occlusion site or stenosis site, and the hollow needle is surrounded by air or liquid at a position slightly retracted from the tip of the hollow needle and expanded and contracted by air or liquid. A catheter provided with a balloon is proposed (Patent Document 1). This catheter inflates the balloon and guides the hollow needle while keeping the peripheral surface of the balloon along the inner wall of the blood vessel, thereby preventing the hollow needle with a sharp tip from coming into contact with the blood vessel wall and reaching the occlusion site. It is said that it is possible to reach the occluded site or the stenotic site without damaging the blood vessel wall.

However, in order to guide the hollow needle with the balloon inflated, it is difficult to introduce it due to the large resistance to the progress, and the balloon cannot pass through in the steeply curved part. There was a problem of doing.

Japanese Unexamined Patent Publication No. 6-63147

Therefore, the present invention has been made to solve such a problem, and by attaching it to the tip of a catheter, it is possible to effectively penetrate an occluded site or a squeezed site having a hardened thrombus. It is an object of the present invention to provide a catheter tip component that can be formed and does not damage the inner wall surface of a blood vessel, and a catheter having the catheter tip component.

The present invention has taken the following measures to achieve the above object.

The catheter tip component attached to the tip of the catheter according to the present invention is
It has a penetrating portion formed in a tapered shape so that the tip is tapered, and a mounting portion used for mounting the catheter on the rear end side of the penetrating portion.
The penetrating portion is characterized by having a plurality of concave grooves on the surface.

According to such a tip component for a catheter, by attaching it to the tip of a catheter and advancing it while rotating it, it is possible to advance while scraping a thrombus at a occluded site or a stenotic site with a concave groove on the surface, so that it is easily cured. It can penetrate the occluded area and the stenotic area. On the other hand, by making the structure for scraping the thrombus a concave groove, there is no risk of damaging the blood vessel even if the tip component for the catheter comes into contact with the blood vessel during the process, and a safe penetration catheter can be obtained.

In the catheter tip component attached to the tip of the catheter according to the present invention.
It has a penetrating portion formed in a tapered shape so that the tip is tapered, and a mounting portion used for mounting the catheter on the rear end side of the penetrating portion.
The penetrating portion is characterized by having a slope portion whose tip is formed obliquely.
Further, in the tip component for a catheter, the penetrating portion may be characterized by having a plurality of concave grooves on the surface thereof.

According to such a catheter tip component, since the tip is cut at an angle, the tip easily pierces the thrombus at the occluded site or the stenotic site. Therefore, it is possible to proceed while scraping off the thrombus at the occluded site or the stenotic site that has been easily hardened.

Further, in the tip component for a catheter according to the present invention, the concave groove may be formed on the outer periphery of the penetrating portion in a straight line from the tip to the rear end side.

By forming a straight line from the front end to the rear end side, the tip part for the catheter can be rotated to effectively remove a thrombus or the like.

Further, in the tip component for a catheter according to the present invention, the concave groove may be formed in a spiral shape on the outer periphery of the penetrating portion.

By forming the concave groove in a spiral shape, the thrombus can be scraped off by the concave groove not only when the tip component for the catheter is rotated but also when it moves in the traveling direction and the retracting direction.

Further, in the tip component for a catheter according to the present invention, the concave groove is characterized in that spirals in opposite directions are formed at the outer periphery of the penetrating portion so as to intersect like diamonds or crosses. There may be.

By forming a concave groove like a diamond or a cross, the thrombus can be scraped regardless of the direction in which the catheter tip part is in contact with the thrombus.

Further, the tip component for a catheter according to the present invention may be characterized in that a surface portion is provided between the concave groove and the concave groove adjacent to the concave groove.

By making the surface between the adjacent concave grooves, it is possible to reduce the risk of damaging the blood vessels even when the tip component for the catheter comes into contact with the blood vessels or the like.

Further, in the tip component for a catheter according to the present invention, the penetrating portion may be characterized in that a step is provided so that the tip side becomes narrower.

By providing such a step, when penetrating the occluded part or the stenotic part due to the thrombus, the thrombus or the like is caused by the stepped portion in addition to the concave groove by moving in the traveling direction and the retreating direction in addition to the movement in the rotation direction. Can be scraped, and the penetration of the catheter can be further improved.

Further, in the tip component for a catheter according to the present invention,
The catheter tip component has a penetrating portion formed in a tapered shape so that the tip is tapered, and a mounting portion used for mounting the catheter on the rear end side of the penetrating portion.
The penetrating portion may be characterized in that a notch is provided at the tip thereof.

By using such a catheter tip component, a notch is formed at the end of the catheter tip, so that it penetrates such as a completely occluded site in a blood vessel or a stenotic site that is too narrow to insert a catheter. Even when the side surface of the portion cannot be brought into contact with the thrombus, the catheter can be effectively penetrated by scraping the thrombus with the notch at the tip.

Further, in the tip component for a catheter according to the present invention,
A surface portion may be provided between the notch portion and the notch portion adjacent to the notch portion.

By providing the surface portion between the notch portion and the adjacent notch portion, the blood vessel can be brought into surface contact with the blood vessel, so that the risk of damaging the inner wall surface of the blood vessel can be reduced.

Further, the surface of the penetrating portion may be provided with a plurality of concave grooves.

By combining a plurality of concave grooves in addition to the notch, a thrombus can be scraped at both the tip and the outer peripheral surface of the catheter tip component.

Further, the catheter tip component may be characterized in that it is made of metal.

By making the tip part for the catheter out of metal, even a hard thrombus or the like can be effectively scraped.

Furthermore, the present invention provides a catheter to which the above-mentioned tip component for a catheter is attached to the tip. This makes it possible to easily manufacture a catheter having the function of the above-mentioned tip component for a catheter.

According to the tip component for a catheter according to the present invention, by attaching to the tip of a catheter, it is possible to effectively penetrate a occluded site or a stenotic site having a hardened thrombus.

FIG. 1 is a schematic view of the catheter 200 and the catheter tip component 100 according to the first embodiment. FIG. 2 is a perspective view and a cross-sectional view of the tip component 100 for the catheter of the first embodiment. FIG. 3 is a perspective view of the catheter tip component 100 according to the second embodiment. FIG. 4 is a diagram showing variations of the catheter tip component 100 according to the second embodiment. FIG. 5 is a perspective view of the catheter tip component 100 according to the third embodiment. FIG. 6 is a perspective view of the catheter tip component 100 according to the fourth embodiment. FIG. 7 is a perspective view showing a variation of the catheter tip component 100 according to the fourth embodiment.

Next, the catheter tip component 100 and the catheter 200 to which the catheter tip component 100 according to the present invention are attached will be described in detail with reference to the drawings. The embodiments and drawings described below exemplify a part of the embodiments of the present invention, are not used for the purpose of limiting to these configurations, and do not deviate from the gist of the present invention. It can be changed as appropriate within the range.

(First Embodiment)
A schematic diagram of the catheter tip component 100 and the catheter 200 according to the first embodiment is shown in FIG. The catheter 200 according to the first embodiment includes a tube 210 to be inserted into a living body, an operation unit 220 provided on the hand side of the tube 210, and a catheter tip component 100 provided at the tip of the tube 210. There is. As shown in FIG. 2, the catheter tip component 100 is formed in a cylindrical body having a hollow portion 10 into which a guide wire or the like is inserted in the center as a whole, and is formed when passing through a closed portion or a narrowed portion due to a thrombus. It has a penetrating portion 20 for scraping a thrombus and the like, and an attachment portion 30 for attaching to the tube 210 of the catheter 200.

The outer periphery of the penetrating portion 20 is formed in a tapered shape so as to gradually taper from the rear end side 21 toward the front end end 22. The tip end side of the penetrating portion 20 has an obliquely formed slope portion 23, and is formed so that the tip end has an acute angle. As shown in the cross-sectional view of FIG. 2B, the tip end portion 22 is formed so that the outer peripheral side has a smooth curved surface so as not to damage the blood vessel when it comes into contact with the inner wall of the blood vessel.

The attachment portion 30 is formed in a cylindrical shape so that it can be inserted into the tube of the catheter 200 and attached. The method of attaching the catheter 200 to the tube is not particularly limited, and the catheter 200 may be attached to the catheter 200 with an adhesive or the like, or may be integrally molded.

The tip component 100 for a catheter is preferably made of a hard member, and is preferably made of a polyamide-based synthetic resin, polyamide, polyethylene, polyimide, polyether ether ketone, polyethylene terephthalate, polyurethane, polypropylene, or other hard plastic, or stainless steel, Ni-. It is preferable to use a metal such as Ti alloy, tungsten, or platinum.

As shown in FIG. 1, the catheter tip component 100 thus produced is used by being attached to the distal end (tip) of a catheter 200 such as a delivery catheter or a microcatheter. When the catheter tip part 100 reaches the occluded part or the stenosis part, the tip of the catheter tip part is formed at an acute angle by pressing the catheter tip part 100 against the occluded part or the stenosis part. By pushing the catheter, the occlusion site can be easily penetrated, or the narrowed portion can be pushed open and penetrated. At this time, a recovery device such as a thrombus may be used at the same time so that the thrombus and debris do not flow in the blood vessel.

As described above, according to the catheter tip component 100 according to the present embodiment, by attaching to the tip of the catheter 200 and using the catheter 200, a occluded portion or a stenotic portion that has been left for a long period of time and hardened is formed with a thin tip. And because it is formed at an acute angle, it can be easily and effectively penetrated by pushing it in. On the other hand, even when the tip component 100 for a catheter comes into contact with the inner wall surface of the blood vessel, the outer peripheral side of the tip is formed of a curved surface, so that there is no risk of damaging the inner wall surface of the blood vessel, and the tip component 100 for a catheter is safe. Can be.

(Second Embodiment)
A perspective view of the catheter tip component 100 according to the second embodiment is shown in FIG. The catheter tip component according to the second embodiment is used by being attached to the tip of the catheter as in the first embodiment.

The tip component for a catheter according to the second embodiment is formed as a tubular body having a hollow portion 10 into which a guide wire or the like is inserted in the center as a whole, and a thrombus or the like is formed when passing through a closed portion or a narrowed portion due to a thrombus. It has a penetrating portion 20 for scraping off and an attachment portion 30 for attaching to the tube 210 of the catheter 200.

The outer periphery of the penetrating portion 20 is formed in a tapered shape so that the tip end portion 22 gradually becomes thinner from the rear end side 21. A plurality of concave grooves 25 are formed on the outer peripheral surface. The cross-sectional shape of the concave groove 25 is not limited, and various forms such as a quadrangle, a semicircle, a semi-elliptical shape, and a V-shape can be selected. The form of the concave groove 25 is a striped form (FIG. 3) in which a plurality of concave grooves 25 formed linearly from the front end to the rear end side like a generatrix are arranged at the same interval, and a spiral shape. In a spiral form in which a plurality of concave grooves 25 are formed (FIG. 4A), spiral concave grooves 25 in different directions are overlapped to form a diamond or a cross formed by intersecting in two directions. (Fig. 4B) and the like. In the striped form shown in FIG. 3, when the tip component 100 for the catheter is rotated, the thrombus or the like can be efficiently scraped, and when the tip component 100 is moved in the traveling / retreating direction, the function of scraping the thrombus or the like is almost the same. Doesn't work. In the spiral shape shown in FIG. 4A, since the concave groove 25 is provided obliquely with respect to the traveling direction, the thrombus is scraped both when the catheter tip part 100 is rotated and when it is moved in the traveling backward direction. be able to. As shown in FIG. 4B, by forming the diamonds and crosses, the thrombus and the like can be scraped off in any direction from the state where the outer peripheral surface is in contact with the thrombus. Therefore, it is preferable to select the form of the concave groove 25 according to the application. However, the form of the concave groove 25 is not limited to these, and can be appropriately designed. Further, the number of the concave grooves 25 is not particularly limited and can be appropriately selected. Further, the width of the groove 25 is 10 μm to 1000 μm, more preferably 20 μm or more and 500 μm or less. The depth is preferably formed to be about 10 μm to 1000 μm, more preferably 20 μm to 100 μm or less. By forming such a concave groove 25, it is possible to efficiently scrape and penetrate the occluded portion and the stenotic portion, and even if the blood vessel comes into contact with the inner wall surface of the catheter tip component 100, the convex portion and the convex portion can be formed. Since no protrusions are formed, it is possible to prevent damage to the inner wall surface of the blood vessel. Further, it is preferable to arrange the concave grooves 25 at intervals so that a surface 28 is formed between the concave groove 25 and the adjacent concave groove 25. Compared to the case where the cross section between the concave groove 25 and the concave groove 25 is formed in a chevron shape, the possibility of damaging the inner wall surface of the blood vessel when the penetrating portion 20 comes into contact with the inner wall surface of the blood vessel is further increased. Can be reduced.

The attachment portion 30 is formed in a cylindrical shape so that it can be inserted into the tube of the catheter 200 and attached. The method of attaching the catheter 200 to the tube is not particularly limited, and the catheter 200 may be attached to the catheter 200 with an adhesive or the like, or may be integrally molded.

As shown in FIG. 1, the catheter tip component 100 thus produced is used by being attached to the distal end (tip) of a catheter 200 such as a delivery catheter or a microcatheter. When the catheter tip part 100 reaches the occluded part or the stenosis part, the catheter 200 is rotated on the hand side while pressing the catheter tip part 100 against the occluded part or the stenosis part, and the catheter 200 is repeatedly advanced and retracted. It progresses while scraping the blood clot to penetrate the obstructed part or stenotic part. At this time, a recovery device such as a thrombus may be used at the same time so that the thrombus and debris do not flow in the blood vessel.

As described above, according to the catheter tip component 100 according to the present embodiment, the occluded portion or the stenotic portion that has been left for a long period of time and hardened by being attached to the tip of the catheter 200 is formed by the concave groove 25. It can be effectively penetrated while scraping. On the other hand, when the unevenness is formed on the surface of the penetrating portion 20, it is formed as a concave portion instead of a convex portion, so that the inner wall surface of the blood vessel is formed even when the tip component 100 for a catheter comes into contact with the inner wall surface of the blood vessel. It is possible to obtain a safe tip component 100 for a catheter without a risk of damaging the catheter.

The concave groove 25 according to the second embodiment may be applied to the catheter tip portion 100 having the obliquely formed slope portion 23 according to the first embodiment.

(Third Embodiment)
A perspective view of the catheter tip component 100 according to the third embodiment is shown in FIG. The catheter tip component 100 according to the third embodiment is provided with a plurality of steps 26 so that the tip side becomes narrower in addition to the concave groove 25 of the catheter tip component 100 according to the second embodiment. It should be noted that these steps 26 can be used in combination with various forms of the concave groove 25 described in the second embodiment. By combining the concave groove 25 and the step 26 in this way, in addition to the shaving by the concave groove 25, the shaving by the step 26 is also added, so that the occluded portion such as a thrombus and the narrowed portion can be efficiently penetrated.

(Fourth Embodiment)
A perspective view of the catheter tip component 100 according to the fourth embodiment is shown in FIG. In the catheter tip component 100 according to the fourth embodiment, a notch 29 is formed from the tip portion of the penetration portion 20 toward the rear end side instead of the concave groove 25 of the catheter tip component 100 according to the second embodiment. Has been done. By providing such a notch 29, when the obstructed portion due to a thrombus or the like is completely obstructed or the tip of the catheter tip component 100 is a narrow constricted portion that cannot be inserted at all, the penetrating portion 20 is provided. When the surface cannot be brought into contact with the thrombus or the like, the thrombus or the like can be scraped off by the notch 29 at the tip, and the obstructed portion or the narrowed portion can be effectively penetrated.

Since the catheter tip component 100 according to the fourth embodiment also does not have a convex portion on the surface of the penetrating portion 20, it is possible to prevent the blood vessel from being damaged even when the catheter tip component 100 comes into contact with the blood vessel. be able to.

As shown in FIG. 7, the catheter tip component 100 according to the fourth embodiment is combined with the concave groove 25 of the catheter tip component 100 according to the second embodiment, or the step 26 according to the third embodiment is provided. You may combine them. By combining these, it is possible to obtain a catheter tip component 100 having each effect.

10 ... Hollow part, 20 ... Penetration part, 21 ... Rear end side, 22 ... Tip end part, 23 ... Slope part, 25 ... Recessed groove, 26 ... Step, 28 ... Surface, 29 ... Notch part, 30 ... Mounting part, 100 ... Catheter tip parts, 200 ... Catheter, 210 ... Tube, 220 ... Operation unit

Claims (13)

In the tip part for catheter attached to the tip of the catheter
It has a penetrating portion formed in a tapered shape so that the tip is tapered, and a mounting portion used for mounting the catheter on the rear end side of the penetrating portion.
The penetration portion is a tip component for a catheter characterized by having a plurality of concave grooves on the surface. In the tip part for catheter attached to the tip of the catheter
It has a penetrating portion formed in a tapered shape so that the tip is tapered, and a mounting portion used for mounting the catheter on the rear end side of the penetrating portion.
The penetrating portion is a tip component for a catheter, characterized in that the penetrating portion includes a slope portion whose tip is formed obliquely. The tip component for a catheter according to claim 2, wherein the penetrating portion is provided with a plurality of concave grooves on the surface. The tip component for a catheter according to claim 1 or 3, wherein the recessed groove is formed linearly from the tip end to the rear end side on the outer periphery of the penetrating portion. The tip component for a catheter according to claim 1 or 3, wherein the concave groove is spirally formed on the outer periphery of the penetrating portion. The tip component for a catheter according to claim 1 or 3, wherein the concave groove is formed by intersecting spirals in opposite directions on the outer periphery of the penetrating portion like diamonds or crosses. The tip component for a catheter according to any one of claims 1, 3 to 6, wherein a surface portion is provided between the concave groove and the concave groove adjacent to the concave groove. The tip component for a catheter according to any one of claims 1 to 7, wherein the penetrating portion is provided with a step so that the tip side becomes narrower. In the tip part for catheter attached to the tip of the catheter
The catheter tip component has a penetrating portion formed in a tapered shape so that the tip is tapered, and a mounting portion used for mounting the catheter on the rear end side of the penetrating portion.
The penetrating portion is a tip component for a catheter, characterized in that a notch is provided at the tip thereof. The tip component for a catheter according to claim 9, wherein a surface portion is provided between the notch portion and the notch portion adjacent to the notch portion. The tip component for a catheter according to claim 9 or 10, wherein the surface of the penetrating portion is provided with a plurality of concave grooves. The tip component for a catheter according to any one of claims 1 to 11, wherein the tip component for a catheter is made of metal. A catheter according to any one of claims 1 to 12, wherein the tip component for a catheter is attached to the tip.

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