JP7282388B2 - Catheter tip and catheter with catheter tip - Google Patents

Description

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

As a treatment method for occlusion sites and stenosis sites due to thrombus such as coronary artery occlusion of the heart and limb blood vessel occlusion, for example, a guide wire is inserted into the blood vessel, introduced to the treatment site, and passed through the occlusion site or stenosis site. A treatment method is performed in which a balloon catheter or the like is left in place, the balloon is inflated to dilate the site of obstruction or stenosis, and, if necessary, a stent is placed in the site.

However, if the blocked or constricted site is left for a long period of time after being formed, it may harden to such an extent that a normal guide wire cannot be passed through it. When such a state is reached, it becomes difficult to penetrate the blocked or constricted site with a guide wire or balloon catheter. A hollow needle with a sharp tip is used as a means for passing through such a hardened obstructed site or constricted site, and the hollow needle is wrapped around the hollow needle at a position slightly retreated from the tip of the hollow needle, and expanded and contracted by air or liquid. A catheter provided with a balloon for the purpose has been proposed (Patent Document 1). With this catheter, the balloon is inflated and the hollow needle is guided along the inner wall of the blood vessel to prevent the hollow needle with a sharp tip from coming into contact with the blood vessel wall. It is possible to reach the occlusion site or stenosis site without damaging the vascular wall.

However, it is difficult to guide the hollow needle with the balloon inflated because there is a great resistance to its progress, and it is difficult to pass the needle through a sharply curved site due to the balloon obstructing it. There was a problem of

JP-A-6-63147

Therefore, the present invention has been made to solve such problems, and by attaching it to the distal end of a catheter, it is possible to effectively penetrate an obstructed site having a hardened thrombus or a stenotic site, in particular. It is an object of the present invention to provide a tip part for a catheter which can be easily cleaned and which does not damage the inner wall surface of a blood vessel, and a catheter having the tip part for a catheter.

The present invention employs the following means to achieve the above objects.

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

According to such a catheter tip part, by attaching it to the tip of the catheter and rotating it while advancing it, it is possible to advance it while scraping off the thrombus at the site of obstruction or stenosis with the concave groove on the surface, so that it can be easily hardened. It is possible to penetrate an obstruction site or a stenosis site. On the other hand, by forming a concave groove for shaving the thrombus, even if the tip part for the catheter comes into contact with the blood vessel while it is in progress, there is no risk of damaging the blood vessel, and a safe catheter for penetration can be obtained.

In the catheter tip part attached to the tip of the catheter according to the present invention,
A penetrating part formed in a tapered shape so that the tip becomes thin, and a mounting part used for mounting a catheter on the rear end side of the penetrating part,
The penetrating portion is characterized by having a sloped portion with an oblique tip.
Moreover, in such a catheter tip part, the penetrating part may have a plurality of concave grooves on the surface thereof.

According to such a catheter tip component, since the tip is cut obliquely, the tip can easily pierce the thrombus at the site of obstruction or stenosis. Therefore, the thrombus at the site of occlusion or stenosis that has hardened can be easily scraped off and advanced.

Further, in the catheter tip component according to the present invention, the concave groove may be formed linearly from the tip end to the rear end side on the outer periphery of the penetration portion.

By forming a linear shape from the front end to the rear end side, a thrombus or the like can be effectively shaved by rotating the tip part for a catheter.

Furthermore, in the catheter tip part according to the present invention, the concave groove may be spirally formed on the outer circumference of the through portion.

By forming the recessed groove in a spiral shape, the thrombus can be scraped off by the recessed groove not only when the catheter tip part is rotated but also when it is moved in the advancing direction and the retreating direction.

Further, in the catheter tip part according to the present invention, the concave groove is characterized in that spirals in opposite directions are formed on the outer circumference of the through portion so as to cross each other like a diamond or a cross. There may be.

By forming concave grooves like a diamond or cross pattern, the thrombus can be shaved by sliding the tip part for a catheter in any direction while it is in contact with the thrombus.

Further, in the catheter tip part according to the present invention, a face portion may be provided between the concave groove and the concave groove adjacent to the concave groove.

By forming a surface between adjacent concave grooves, it is possible to reduce the possibility of damaging a blood vessel even when the tip part for a catheter comes into contact with a blood vessel or the like.

Further, in the catheter tip component according to the present invention, the penetrating part may be provided with a step so that the tip side becomes narrower.

By providing such a stepped portion, when penetrating a site blocked by a thrombus or a stenotic site, movement in the advancing direction and the retreating direction in addition to the movement in the rotational direction allows the thrombus, etc., to be removed by the stepped portion in addition to the recessed groove. can be shaved, and the penetration of the catheter can be further improved.

Furthermore, in the tip part for a catheter according to the present invention,
The tip part for a catheter has a penetrating part formed in a tapered shape so that the tip end is tapered, and an attachment part used for attachment to a catheter on the rear end side of the penetrating part,
The penetrating part may be characterized by having a notch at the tip.

By using such a catheter tip component, a notch is formed at the end of the catheter tip, so that it is possible to penetrate through a completely occluded site in a blood vessel or a stenotic site that is so narrow that a catheter cannot be inserted at all. Even if the side surface of the catheter cannot be brought into contact with the thrombus, scraping the thrombus with the notch at the distal end enables effective penetration of the catheter.

Furthermore, in the tip part for a catheter according to the present invention,
A face 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, it is possible to bring the surface into contact with the blood vessel, thereby reducing the risk of damaging the inner wall surface of the blood vessel.

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

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

Furthermore, the tip part for a catheter may be made of metal.

Even a hard thrombus or the like can be effectively shaved by making the tip part for a catheter out of metal.

Furthermore, the present invention provides a catheter having the above-described catheter tip component attached to its distal end. As a result, a catheter having the function of the tip part for a catheter described above can be easily produced.

According to the catheter tip component of the present invention, by attaching it to the tip of a catheter, it is possible to effectively penetrate even an obstructed site or a stenosed site having a hardened thrombus.

FIG. 1 is a schematic diagram of a catheter 200 and a 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 a catheter according to the first embodiment. FIG. 3 is a perspective view of the catheter tip component 100 according to the second embodiment. FIG. 4 is a view showing variations of the catheter tip component 100 according to the second embodiment. FIG. 5 is a perspective view of a catheter tip component 100 according to a third embodiment. FIG. 6 is a perspective view of a catheter tip component 100 according to a 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 according to the present invention and the catheter 200 to which the catheter tip component 100 is attached will be described in detail with reference to the drawings. It should be noted that the embodiments and drawings described below illustrate a part of the embodiments of the present invention, and are not used for the purpose of limiting to these configurations, and do not depart from the gist of the present invention. It can be changed as appropriate within the range.

(First embodiment)
A schematic diagram of a catheter tip component 100 and a catheter 200 according to the first embodiment is shown in FIG. A catheter 200 according to the first embodiment includes a tube 210 to be inserted into a living body, an operation section 220 provided on the proximal 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 tip part 100 for a catheter is formed into 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 when passing through an obstructed portion or a constricted portion due to a thrombus, It has a penetrating portion 20 for scraping off thrombi and the like, and an attaching portion 30 for attaching to the tube 210 of the catheter 200 .

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

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

The catheter tip part 100 is preferably made of a hard material, such as hard plastic such as polyamide synthetic resin, polyamide, polyethylene, polyimide, polyetheretherketone, polyethylene terephthalate, polyurethane or polypropylene, stainless steel, Ni- Metals such as Ti alloys, tungsten, and platinum are preferably used.

As shown in FIG. 1, the catheter tip component 100 thus manufactured 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 obstruction site or the stenosis part, the tip of the catheter tip part 100 is pressed against the obstruction part or the stenosis part. By pushing the catheter, it is possible to easily penetrate an obstructed site or to penetrate a constriction while expanding it. At this time, a thrombus recovery device may be used at the same time so that 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 it to the tip of the catheter 200 and using it, the tip of the clogged or constricted part that has hardened due to being left for a long period of time can be formed with a thin tip. and is formed at an acute angle, it can be penetrated easily and effectively by pushing. On the other hand, even if the catheter tip part 100 comes into contact with the inner wall surface of the blood vessel, since the outer peripheral side of the tip is formed with a curved surface, there is no risk of damaging the inner wall surface of the blood vessel, and the catheter tip part 100 is safe. can be

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

The tip part for a catheter according to the second embodiment is formed in a cylindrical body having a hollow part 10 into which a guide wire or the like is inserted. and an attaching portion 30 attached to the tube 210 of the catheter 200 .

The penetrating portion 20 has a tapered outer periphery such that the distal end portion 22 is gradually tapered from the rear end side 21 . A plurality of grooves 25 are formed on the outer peripheral surface. The cross-sectional shape of the concave groove 25 is not limited, and various shapes such as square, semicircle, semiellipse, and V-shape can be selected. As for the form of the groove 25, a plurality of grooves 25 linearly formed from the front end to the rear end like a generatrix are arranged at equal intervals in a striped form (FIG. 3), or in a spiral form. A spiral form in which a plurality of grooves 25 are formed in the center (FIG. 4A), and a diamond or cross pattern formed by overlapping spiral grooves 25 in different directions and intersecting in two directions. and the like (FIG. 4B). With the striped configuration shown in FIG. 3, when the tip part 100 for a catheter is rotated, thrombi can be efficiently shaved, and when it is moved in the advancing/retreating direction, the function of scraping thrombi, etc. is almost non-existent. doesn't work. 4A, the concave groove 25 is obliquely provided with respect to the advancing direction, so that the thrombus can be scraped both when the catheter tip part 100 is rotated and when it is moved in the advancing and retreating direction. be able to. As shown in FIG. 4B, by forming the diamond-shaped and cross-shaped patterns, the thrombus or the like can be scraped off by sliding in any direction from the state in which 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 shape of the concave groove 25 is not limited to these, and can be designed as appropriate. Also, the number of grooves 25 is not particularly limited, and can be selected as appropriate. Furthermore, the width of the concave groove 25 is 10 μm to 1000 μm, more preferably 20 μm or more and 500 μm or less. The depth should 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 off and penetrate the obstructed site or the constricted part, and even if the inner wall surface of the tip part 100 for a catheter comes into contact with the blood vessel, the convex part or Since no protrusion is formed, it is possible to prevent damage to the inner wall surface of the blood vessel. Furthermore, it is preferable that the grooves 25 are spaced apart from each other so that a surface 28 is formed between the grooves 25 adjacent to each other. Compared to the case where the cross section between the concave grooves 25 is formed in a mountain shape, the possibility of damaging the inner wall surface of the blood vessel when the penetrating part 20 contacts the inner wall surface of the blood vessel is further reduced. can be reduced.

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

As shown in FIG. 1, the catheter tip component 100 thus manufactured 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 occlusion site or stenosis, the catheter 200 is rotated on the proximal side while pressing the catheter tip part 100 against the occlusion site or the stenosis, or is repeatedly advanced and retracted. The thrombus is scraped and advanced to penetrate the occlusive site or constriction. At this time, a thrombus recovery device may be used at the same time so that 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 it to the tip of the catheter 200 and using it, the recessed groove 25 can be used to remove an obstructed site or a constricted site that has hardened due to being left for a long period of time. It can be effectively penetrated while scraping off. On the other hand, when the unevenness is formed on the surface of the penetrating portion 20, even if the catheter tip component 100 comes into contact with the inner wall surface of the blood vessel, the inner wall surface of the blood vessel is not affected by the formation of the recess instead of the protrusion. It is possible to provide a safe catheter tip component 100 without a risk of damaging the catheter.

The recessed groove 25 according to the second embodiment may be applied to the distal end part component 100 for a catheter having the obliquely formed slope portion 23 according to the first embodiment.

(Third Embodiment)
A perspective view of a catheter tip component 100 according to a third embodiment is shown in FIG. A catheter tip component 100 according to the third embodiment is provided with a plurality of steps 26 so as to taper on the tip end side, in addition to the concave groove 25 of the catheter tip component 100 according to the second embodiment. These steps 26 can be used in combination with various forms of the grooves 25 described in the second embodiment. By combining the recessed groove 25 and the step 26 in this manner, the recessed groove 25 not only scrapes the groove 25 but also the step 26, thereby efficiently penetrating the occlusive site such as a thrombus and the narrowed portion.

(Fourth embodiment)
A perspective view of a catheter tip component 100 according to a fourth embodiment is shown in FIG. In the catheter tip component 100 according to the fourth embodiment, instead of the concave groove 25 of the catheter tip component 100 according to the second embodiment, a notch portion 29 is formed from the distal end portion of the penetrating portion 20 toward the rear end side. It is By providing such a cutout portion 29, the penetration portion 20 can be removed when the occlusion site due to a thrombus or the like is completely occluded, or when the distal end of the catheter tip component 100 is in a constriction so narrow that it cannot be inserted at all. When the surface cannot be brought into contact with the thrombus or the like, the notch 29 at the tip allows the thrombus or the like to be scraped off, thereby effectively penetrating the obstructed site or constriction.

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, even when the catheter tip component 100 comes into contact with the blood vessel, the blood vessel is prevented from being damaged. be able to.

As shown in FIG. 7, the catheter tip part 100 according to the fourth embodiment is combined with the concave groove 25 of the catheter tip part 100 according to the second embodiment, or the step 26 according to the third embodiment is combined. You can combine them. By combining these, the catheter tip component 100 having the respective effects can be obtained.

DESCRIPTION OF SYMBOLS 10... Hollow part 20... Through part 21... Rear end side 22... Tip end part 23... Slope part 25... Groove 26... Step, 28... Surface, 29... Notch part, 30... Mounting part, DESCRIPTION OF SYMBOLS 100... Tip part for catheter, 200... Catheter, 210... Tube, 220... Operation part

Claims (6)

In a catheter tip part attached to the tip of a microcatheter,
It is formed in a cylindrical body having a hollow part in the center,
A truncated conical shape having a penetrating portion formed in a tapered shape so that the tip end is tapered, a cylindrical attachment portion used for attachment to a catheter on the rear end side of the penetrating portion, and a hollow portion at the center. is formed into a cylindrical body of
The through portion has a plurality of concave grooves with a width of 10 μm to 500 μm and a depth of 10 μm to 100 μm on the surface,
A distal end component for a catheter, wherein the concave groove is formed on the outer periphery of the penetrating portion so as to have the same linear cross section from the distal end side to the rear end side. 2. The tip part for a catheter according to claim 1, wherein a surface portion is provided between said concave groove and a concave groove adjacent to said concave groove. 2. The tip part for a catheter according to claim 1, wherein the penetrating part has a plurality of cutouts at its tip . 4. The tip part for a catheter according to claim 3, further comprising a face portion between said notch portion and said notch portion adjacent to said notch portion. The tip part for a catheter according to any one of claims 1 to 4, wherein the tip part for a catheter is made of metal. 6. A catheter having the tip part for a catheter according to any one of claims 1 to 5 attached to its tip.

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