JP3474136B2 - Medical catheter - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medical catheter, more specifically, a part of a catheter body (arbitrary part, mainly near the tip) during extracorporeal circulation of blood.
The present invention relates to a catheter suitable for use by being bent as necessary.

[0002]

2. Description of the Related Art Conventionally, excessive bending is obstructed when it is necessary to bend and insert the medical catheter as described above, or when a catheter whose bent state is a steady state is inserted. If it is necessary to make a straight line or a gentle bend in order to achieve this, insert a metal or resin core material generally called a stylet into the lumen (main lumen, mainly lumen) of the catheter body, or For example, an embedded core metal is embedded in a thick portion of the catheter body to bend an arbitrary portion of the catheter body and maintain the bend.

However, when inserting the catheter by inserting the stylet into the lumen of the catheter body, the purpose of use of the stylet is to insert the catheter into the target site. On the other hand, since the stylet is removed after the catheter is inserted, consideration has not been given to maintaining the bending after insertion of the catheter. Also, in the case of a catheter in which a cored bar is embedded in the thick part of the catheter body, in addition to the adverse effect of reducing the cross-sectional area of other lumens, the part where the catheter is bent may vary depending on the individual patient and the condition of the affected part. Since a metal core that changes and cannot be specified requires a metal core having a length approximately the same as the total length of the catheter, the metal core must be inserted even at a site where bending is not required to be maintained. The flexibility of the entire body was impaired, and the catheter body and the pipes connected to the catheter entered the operative field depending on the direction of insertion, which was troublesome.

[0004]

SUMMARY OF THE INVENTION Therefore, the present invention solves the above-mentioned conventional problems and allows the catheter body to be bent at a necessary portion, and the bending can be maintained and bent. It is an object of the present invention to provide a medical catheter in which the flexibility of the catheter main body other than the above-mentioned site can be maintained as it is, and the catheter main body and the piping connected to the catheter main body do not easily enter the operative field.

[0005]

In order to achieve the above-mentioned object, the invention of claim 1 is a catheter in which a balloon is attached to a distal end side position of a catheter body, and a catheter is provided at a position behind the balloon of the catheter body. A bending imparting body made of metal, which is composed of two rings and a bendable connecting member that connects them, is fitted by inserting the both rings, and the inner diameter of the ring on the tip side of the bending imparting body is almost equal to the outer diameter of the catheter body. Equal or slightly smaller ,
The inner diameter of the ring on the rear end side of the bending body is outside the catheter body.
The diameter is larger than the diameter, and any portion of the catheter body to which the bend imparting body is attached can be bent at a predetermined angle by bending the connecting member. . A second aspect of the present invention is characterized in that, in the first aspect, the hollow cylindrical cover having both ends opened covers the entire bending imparting body, and is attached only to the tip side ring by being bonded.

[0006]

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A medical catheter according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an overall front view of the medical catheter made of silicone rubber, omitting a part of its length, and having a tubular catheter body 2 with an outer diameter of about 6 mm and a total length of about 300 mm, for example. However, a closed tip portion 9 is provided on the tip side of the main body. The balloon 6 is provided at both ends 7 at the rear position of the tip portion 9.
It is provided by bonding a and 7b. At the rear position of the balloon 6, a metal bending imparting body 8 made of, for example, stainless steel is attached. As shown in FIG. 2, the bending imparting body 8 includes a front end side ring 8a, a rear end side ring 8b, and a bendable connecting member 8c made of a small flat plate that connects these rings. In this example, both ends of the connecting member 8c are provided on the outer peripheral surfaces of the rings 8a and 8b so that the rings are concentric. The inner diameter L2 of the tip side ring 8a is substantially equal to or slightly smaller than the outer diameter L1 of the catheter body 2, and the inner diameter L3 of the rear end side ring 8b is sufficiently larger than the outer diameter L1 of the catheter body 2. ing. On the rear end side of the catheter main body 2, a funnel portion 10 opened by an opening portion 3 communicating with the lumen is provided, and the funnel portion 10 is provided with a branch pipe 4. The branch pipe 4 communicates with a balloon lumen (thickness of the catheter body, not shown) for inflating the balloon 6, and a one-way valve 5 is provided at the rear end thereof.

[0008] In use, it is decided by preoperative diagnostic imaging or surgery method at which part the medical catheter 1 should be bent, and the catheter body 2 is lightly stretched in the longitudinal direction to reduce the outer diameter, After the center of the bending imparting body 8 is positioned at the determined bending portion, the extension of the catheter main body 2 is released to fix the position, and the connecting member 8c is bent at an arbitrary angle. At this time, if the catheter main body 2 is slightly floated from the connecting member 8c as shown in FIG. 3, the catheter main body 2 draws a clean curve, so that the lumen of the catheter main body 2 or its lumen may be kinked or narrowed. Can be prevented. Since the inner diameter L2 of the distal ring 8a is substantially equal to or slightly smaller than the outer diameter L1 of the catheter body 2, a strong force is not applied due to the frictional resistance between the inner surface of the ring 8a and the outer surface of the catheter body 2. Although it does not move as much as possible, the rear end side ring 8b has an inner diameter L3
Is sufficiently larger than the outer diameter L1 of the catheter body 2 and a sufficient gap is formed between the catheter body 2 and the catheter body 2, so that the catheter body 2 can be slid relatively easily.

If the inner diameter L3 of the rear end side ring 8b is not set to be sufficiently larger than the outer diameter L1 of the catheter body 2, the frictional resistance between the ring 8b and the catheter body 2 becomes large, As shown in FIG. 4 (A), the catheter body 2 is kinked. Further, when the bending member 8 is bent so that the connecting member 8c is on the outer side, the catheter body 2 draws a clean curve as shown in FIG. 4B, but the curve drawn by the connecting member 8c is Since it does not follow, it seems that the bending part becomes large and cannot be used. Furthermore, the connection member 8c is bent so that it is on the outside,
If there is not enough margin between the inner diameter L3 of the rear end side ring 8b and the outer diameter L1 of the catheter main body 2, the inner lumen of the catheter main body 2 is closed by kinking as shown in FIG. 4 (C).

FIG. 5 is a view showing a modified example in which the bending imparting body 3 is provided with a hollow cylindrical (tube-shaped) cover 11 having both ends opened. The cover 11 is provided to prevent the metal bending imparting body 8 from directly touching the human body (tissue), and for that purpose, a material having biocompatibility, for example, silicone rubber or the like is preferable. . As shown in the figure, the cover 11 covers the entire bend imparting body 3, and at this time, the inner surface is bonded only to the outer peripheral surface of the tip side ring 8a of the bend imparting body 8. Therefore, when the catheter body 2 is bent at an arbitrary portion, it can be followed even when the catheter body 2 and the bend imparting body 8 become as shown in FIG. Further, FIG. 6 shows a further modified example of FIG. 5, and the cover 11 ′ has a shape adapted to cover the minimum necessary amount of the bending imparting body 8. That is, compared with the cover 11 of FIG. 5, there is no space between the front end side ring 8a and the rear end side ring 8b (excluding the portion of the connecting member 8c), and the shape is in accordance with the shape of the bend imparting body 8, Is similarly formed not only on both ends but also on inner surfaces (opposite of the opening) of the rings 8a and 8b which face each other. In addition, in the case of FIG. 6, the portion where the cover 11 'and the catheter body 2 directly contact with each other is reduced, so that the friction resistance is reduced as compared with the cover 11, and when the catheter body 2 is bent, the catheter body 2 is clean as shown in FIG. It can be done smoothly to draw a curve.

[0011]

In the above description of the bending imparting body 8, only a preferable example is shown, and the outer diameter of the catheter body 2 and the total length of the catheter 1 can be appropriately changed as required, and this embodiment It is not the 2WAY type, which has the simplest structure as a balloon catheter as shown in the embodiment, but is, for example, a 3WAY type with a sub-lumen, a catheter with various sensors embedded, or a lattice-shaped protrusion for preventing slippage on the balloon. Regardless of the structure of the catheter, such as the catheter provided, bend is given,
It is possible to maintain. Further, the material of the bending imparting body 8 is not limited to stainless steel as described above, and may be another metal material as long as it can be bent to some extent.

[0013]

Since the invention of claim 1 or 2 has the above-mentioned construction, the catheter body can be bent at a necessary portion by using the bending imparting body, and the bending can be maintained. Further, unlike the prior art, the flexibility of the catheter main body other than the bent portion can be maintained as it is, and the catheter main body and the piping connected thereto can be prevented from easily entering the operative field. Further, an arbitrary portion of the catheter body bends in a manner to follow the bending connecting member, and the bend does not return because the bend imparting body is made of metal. The frictional resistance becomes large between the inner wall and the catheter outer wall of the main body of the distal ring, easily displaced it in addition to eliminating the catheter body
Since a sufficient gap is formed between them , the catheter body can be slid relatively easily. In the invention of claim 2, since the bend imparting body does not directly contact the tissue,
It is possible to prevent damage to tissues and the like.

[Brief description of drawings]

FIG. 1 is an overall front view showing a medical catheter according to an embodiment of the present invention with a part thereof omitted.

FIG. 2 is a perspective view with a part of the bend imparting body omitted.

FIG. 3 is an operation explanatory view.

4 (A), (B), and (C) are explanatory views of the operation of an unfavorable example.

FIG. 5 is a partially omitted front view showing an example in which the bend imparting body is covered with a cover.

FIG. 6 is a partially omitted front view showing still another example in which the bend imparting body is covered with a cover.

[Explanation of symbols]

1 Medical catheter 2 catheter body 3 openings 4 branches 5 one-way valve 6 balloons 7a, 7b Both ends (adhesive) part 8 Bending body 8a Tip side ring 8b Rear end ring 8c connection member 9 Tip 10 Funnel part 11, 11 'cover

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Junichiro Hideda 2-14-16 Nakata, Chikusa-ku, Nagoya, Aichi Fuji Systems Co., Ltd. Nagoya Branch (56) References: Mitsuihei 2-149253 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) A61M 25/00

Claims (2)

(57) [Claims] 1. A catheter in which a balloon is attached to a distal end side of a catheter body, and a metal bend imparting member comprising two rings and a bendable connecting member for connecting them at a position behind the balloon of the catheter body. The body is fitted by inserting both the rings, and the inner diameter of the ring on the distal end side of the bend imparting body is substantially equal to or slightly smaller than the outer diameter of the catheter body , and the bend imparting body is
The inner diameter of the ring on the rear end side is larger than the outer diameter of the catheter body.
The catheter for medical use is characterized in that any portion of the catheter body to which the bend imparting body is attached can be bent at a predetermined angle by bending the connecting member. . 2. The medical catheter according to claim 1, wherein a hollow cylindrical cover having both ends opened covers the entire bending imparting body and is attached only to the distal end side ring by being bonded.