JPH0644553U - Catheter introducer - Google Patents

Abstract

(57) [Summary] [Purpose] Excellent safety because it can be inserted into a blood vessel with minimal resistance, it can be left inside the blood vessel without worrying that the sheath tip will damage the blood vessel wall, and the expansion tube can be easily removed. And operability. [Structure] The sheath 1 is provided with a soft tip 3 to prevent damage to the blood vessel wall. In addition, the expansion tube 5 has a tapered beveled portion 6 and a tapered beveled portion 7, and a maximum diameter portion 8 is provided with an enlarged head portion 9 having substantially the same diameter as the outer diameter of the sheath 1, so that the soft distal end portion 3 of the flexible distal end portion 3 at the time of insertion is inserted. Measured for protection and easy removal.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an introducer for inserting a catheter into a blood vessel for injecting a contrast agent or a drug, introducing a balloon, or the like.

[0002]

[Prior art]

 It is widely practiced to insert a catheter lightly into a target position of a blood vessel, inject a contrast agent or a drug, or inflate a balloon to perform diagnosis and treatment. It is necessary to insert the introducer into the blood vessel.

The introducer comprises a sheath having a connection base and an expansion tube having a connection base, and the connection base is connected to the connection base while the expansion tube is inserted into the sheath and the tip is projected. Insert the dilatation tube into the blood vessel by attaching it to the guide wire previously inserted into the blood vessel, insert the dilatation tube and the guide wire into the blood vessel, and then remove the dilation tube and the guide wire. It is inserted and inserted to the target position in the blood vessel.

In such an introducer, in order to eliminate the step due to the resistance caused by being caught by the human body structure during insertion between the guide wire, the expansion tube, and the sheath, and the step which causes the pain caused thereby, there is no need to use the step A in FIG. As shown in FIG. 5, the distal ends of the expansion tube 51 and the sheath 53 are tapered inclined surfaces 52 and 54. However, since the sheath 53 has a considerable hardness, when the expansion tube 51 and the guide wire are pulled out and left in the blood vessel, the tip edge sharpened by the inclined surface 54 collides with the blood vessel wall. There is a problem that it is easily damaged.

Therefore, as shown in FIG. 2B, the distal end of the sheath 53 is not tapered but remains in a cut-off shape, and the base end has a diameter equal to the outer diameter of the sheath 53 and decreases toward the distal end. It is disclosed in Japanese Patent Laid-Open No. 2-246984 that there is no step by providing the portion 55 at the tip of the expansion tube 51 and the resistance at the time of insertion is reduced. However, the tip surface of the sheath 53 and the conical head 55 are disclosed. Since the proximal end surface of the expansion tube 51 is in contact with and is engaged with each other on a plane intersecting with the axis, it is extremely difficult to remove the expansion tube 51, and the distal end of the sheath 53 after removal does not have a corner portion. The problem remains that it is easy to damage the blood vessel wall because it has it.

[0006]

[Problems to be solved by the device]

 The problem to be solved by the present invention is that the introducer that has been used or proposed has a significantly large resistance during insertion, the tip of the sheath left inside the blood vessel is likely to damage the blood vessel wall, and It has at least one problem that it is difficult to extract, and there was no safe and easy introducer that could be inserted into the blood vessel and left the sheath without these problems. .

[0007]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention forms the distal end portion of the sheath with a soft material, and forms a thicker tapered portion at the distal end portion of the expansion tube that has a larger diameter toward the distal end and then a smaller diameter toward the distal end. The maximum diameter is almost equal to the outer diameter of the sheath, and the enlarged head is formed, and by such means, the purpose of providing an introducer without the above-mentioned problems is achieved. It was

[0008]

[Action]

 Insert the expansion tube into the sheath from the proximal side, and insert the expansion head into the blood vessel with the expanded head protruding from the tip of the sheath. At this time, the maximum diameter portion of the expanded head portion is located slightly in front of the soft tip portion of the sheath and expands human tissues and blood vessels in advance so that expansion and contraction of the soft tip portion are prevented. Also, the tapered tip portion is inserted into the sheath without being caught on the distal end edge of the sheath and is withdrawn, and the remaining distal end portion of the sheath is soft and does not damage the blood vessel wall.

[0009]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows an essential part of an introducer according to the present invention, in which a distal end portion of a sheath 1 having a connection base portion (not shown) at its base end is provided. A short tubular (or tip-shaped) soft tip 3 which is sufficiently flexible as compared with the sheath body 2 which occupies substantially the entire length of the sheath 1 is integrally joined by fusion.

In addition, at the distal end portion of the expansion tube 5 which has a coupling base portion (not shown) at the proximal end and is tightly fitted to the sheath 1, a tapered beveled portion 6 having a larger diameter toward the distal end, and subsequently to it. An enlarged head portion 9 is formed which is composed of a tapered inclined portion 7 having a smaller diameter toward the tip end and has a maximum diameter substantially equal to the outer diameter of the sheath 1.

The tapered beveled portion 6 is formed with a considerably large inclination angle so that it can be fitted into the distal end edge of the sheath 1 without being caught at the time of extraction, and the tapered beveled portion 7 is smoothly inserted with a minimum resistance. The angle of inclination is small enough to dilate the blood vessels. Further, the tip ends of the soft tip portion 3 and the enlarged head portion 9 are rounded so that there is no portion where there is a risk of damaging the blood vessel wall.

In the present embodiment having such a configuration, when the expansion tube 5 is inserted into the sheath 1 from the proximal end side, the enlarged head 9 is inserted while expanding the sheath 1, and the enlarged head 9 is inserted into the proximal end. When the tip edge of the sheath 1 and the tip edge of the sheath 1 are projected to substantially coincide with each other, the connecting base portion and the connecting base portion at their base ends are generally joined by a luer bond. An inner needle (not shown) is inserted through the expansion tube 5 for reinforcement, and the inner needle is removed when the expansion tube 5 is inserted into the sheath 1 and set.

When the expansion tube 5 is fitted to the guide wire previously inserted into the blood vessel and is percutaneously inserted into the blood vessel integrally with the sheath 1, the soft distal end portion 3 of the sheath 1 is positioned slightly forward. The maximum diameter part 8 of the enlarged head 9 to be placed does not come into contact with these because it pushes forward while expanding human tissue and blood vessels, and therefore these resistances cause them to curl up and spread like a trumpet or contract like a bellows. It is smoothly advanced and inserted into the blood vessel.

When the insertion into the blood vessel is finished, the guide wire and the expansion tube 5 are pulled out from the sheath 1. At this time, the tapered beveled portion 6 does not catch on the distal end edge of the sheath 1 and expands the sheath 1. While retreating, it will be inserted and removed.

On the other hand, the sheath 1 does not have a risk of being damaged even if the soft distal end 3 collides with the blood vessel wall, and is safely left in the blood vessel to guide the catheter.

[0016]

[Effect of device]

 As described above, according to the present invention, which is composed of the sheath having the soft tip and the expansion tube having the enlarged head including the tapered slope and the tapered slope, the present invention does not cause resistance due to catching and causes pain. It is easy to insert without having to worry about damaging the blood vessel wall with the tip of the sheath left inside the blood vessel, and it is extremely easy to remove the dilation tube, and it has excellent safety and operability. The effect is brought.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an essential part showing an embodiment of the present invention.

2A and 2B are partial vertical cross-sectional views showing a conventional example.

[Explanation of symbols]

1 sheath, 3 soft tip, 5 expansion tube, 6
Tapered inclined part, 7 tapered inclined part, 8 maximum diameter part,
9 enlarged head,

Claims (1)

[Scope of utility model registration request] 1. An introducer for a catheter comprising a sheath and an expansion tube having a distal end portion projecting through the sheath and inserted therein, wherein the distal end portion of the sheath is formed of a soft material, and the distal end portion of the expansion tube is provided. It is characterized in that an enlarged head portion is formed which is composed of a tapered inclined portion having a large diameter toward the distal end and a tapered inclined portion having a small diameter toward the distal end, and having a maximum diameter substantially equal to the outer diameter of the sheath. Introducer.