JP3166009B2 - Double lumen 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 double-lumen catheter comprising a child catheter and a parent catheter, and more particularly, to bending of a rear end of a child catheter extending rearward from a Y-type connector and locking of the child catheter. The present invention relates to a double-lumen catheter capable of preventing the operation stud valve from being loosened.

[0002]

2. Description of the Related Art Generally, a double-lumen catheter is composed of a concentrically arranged child catheter and a parent catheter. In such a catheter, a Y-type connector is attached to the rear end of the catheter, the rear end of the parent catheter is connected to the front end of the Y-type connector, and the rear end of the child catheter is inserted so as to extend rearward of the Y-type connector. In some cases, the child catheter is slidably mounted on the parent catheter. A stud valve is provided at the rear end of the Y-type connector, and the valve locks the rear end of the child catheter to prevent sliding.

However, in the vicinity of the stud valve, there is a problem that the rear end of the child catheter is apt to receive a local stress due to a bending action, and is likely to be damaged early due to stress concentration due to the repeated bending action. In addition, if the stud valve is accidentally loosened during use and the child catheter moves, treatment may be interrupted or a medical accident may occur.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a double-lumen catheter which prevents damage to a child catheter and loosening of a stud valve in the double-lumen catheter.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a child catheter which is slidably mounted on a parent catheter, and a rear end of the parent catheter is connected to a front end of a Y-shaped connector having a branch passage. A double-lumen type in which the rear end of the child catheter is extended so as to penetrate the Y-type connector rearward, and a stud valve for locking the rear end of the child catheter is provided at the rear end of the Y-type connector. In the catheter, a cover member for covering the stud valve at the rear end of the Y-type connector and the rear end of the child catheter is detachably provided.

Since the cover member for covering the stud valve and the rear end of the child catheter is detachably attached in this manner, the rear end of the child catheter is not subjected to a bending action, thereby preventing damage to the child catheter. And the loosening of the stud valve can be prevented.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 shows a hemodialysis catheter which is an example of the double lumen catheter of the present invention. This catheter 1 includes a flexible parent catheter 2 and a child catheter 3 disposed inside the parent catheter 2, and has a coaxial two-layer structure as shown in FIG. The child catheter 3 extends rearward longer than the parent catheter 2 and has a distal end connected to the distal end of the parent catheter 2 so as to be slidable in the longitudinal direction. The distal end tip 8 is attached to the connecting portion of these distal ends, and only the distal end of the child catheter 3 is opened, and the parent catheter 2 is closed.

The rear end of the parent catheter 2 is connected to the front end 4a of a Y-type connector 4 made of hard plastic or the like. The Y-type connector 4 includes a tubular connector body 4X extending straight from the front end 4a, and a tubular branch portion 4Y that branches backward from the middle of the connector body 4X. Is connected to an extension tube T1 for extracting blood. The branch portion 4Y communicates with an interlayer passage between the child catheter 3 and the parent catheter 2. On the other hand, the rear end portion 3a of the child catheter 3 extends rearward so as to pass through the rear end of the connector body 4X, and the extension tube T2 can be connected to the connection portion 5 attached to the rear end. A flange portion 5a is formed on the outer peripheral surface of the central portion of the connecting portion 5 along the circumferential direction.

At the rear end of the connector body 4X, a stud valve 6 capable of preventing the slave catheter 3 from sliding in the longitudinal direction is provided.
Is provided. As shown in FIG. 3, the stud valve 6 has a female screw portion 6b screwed to a male screw portion 6a formed on the outer peripheral surface of the rear end portion of the connector main body 4X on the inner peripheral surface. A knob 6X is provided in which the portion 6c is juxtaposed to the inner peripheral side of the female screw portion 6b. Outer peripheral surface 6d of knob 6X
Are provided with anti-slip irregularities.

An inner peripheral passage at the rear end of the connector body 4X is formed in a large diameter portion 6f, and a rubber ring 6g is fitted in the large diameter portion 6f. By turning and tightening the knob 6X, the protrusion 6c presses the rubber ring 6g, and the swelling deformed rubber ring 6g locks the rear end 3a of the child catheter in the inner peripheral passage 4c of the connector main body 4X. The sliding of the child catheter 3 is prevented.

A plurality of straight cuts 7 are provided in the distal end portion 2A of the parent catheter 2 in parallel along the longitudinal direction, and the cuts 7 form a plurality of strips 7a. In the above configuration, the child catheter 3
Is used to return blood after washing to the body during dialysis, and the parent catheter 2 is used to remove blood from the body for dialysis. The connecting portion 5 is an operating portion of the catheter 1, and by pulling the operating portion to the rear side, the child catheter 2 is moved to the rear end side to retreat the distal end tip 8, and the distal end portion 2A of the parent catheter 2 is illustrated. As shown in FIG. 4, it can be expanded in a basket shape. Open cut 7
Is an outlet for blood in the body. When the connecting portion 5 is returned to the original position, the distal end portion 2A converges in a tubular shape as shown in FIG.

The distal end 2A of the parent catheter 2 is expanded,
With the child catheter 3 locked by the stud valve 6, as shown in FIG. 1B, a cover member R for covering the stud valve 6 at the rear end of the Y-type connector 4 and the child catheter rear end 3a is attached. Can be A cover member R composed of a cylindrical small-diameter portion Ra for protecting the rear end portion 3a of the child catheter 3 and a cylindrical large-diameter portion Rb for completely covering the knob 6X of the stud valve 6 is divided into two right and left parts. Half part R1, R
2 and is detachably mounted between the flange portion 5 a of the connection portion 5 and the stud valve 6. The inner peripheral surface of the large-diameter portion Rb is formed in a slightly elliptical shape,
Since both ends b1 of the inner peripheral surface of the large diameter portion b of the half part R1 (R2) are on the minor axis side of the ellipse, the outer peripheral surface of the knob 6X is fitted to both ends of the inner peripheral surface so as to bite slightly. , Fixed.

An X-ray opaque agent is mixed or applied to the distal ends of the parent catheter and the child catheter so that they can be seen through X-rays during treatment. The tip 8 of the distal end connecting portion between the parent catheter 2 and the child catheter 3 is made of a flexible material, so that the catheter 1 can be inserted into a blood vessel without damaging the blood vessel. As shown in FIG. 6, the catheter 1 of the present invention is used by inserting its distal end into the blood vessel 9 as described above. As described above, the stud valve at the rear end of the Y-type connector is provided by the detachable cover member R. In order to cover the rear end 3a of the child catheter, the rear end 3a of the child catheter is not subjected to a bending action, so that it is difficult to bend. Not even. Further, even if the knob 6X may rotate and loosen together with the cover member R, the flange 5a of the connecting portion 5 hits the small-diameter portion Ra of the cover member R to prevent the child catheter 3 from returning. The parent catheter distal end portion 2A can always be kept in the expanded state.

In the present invention, a known flexible material used for a conventional catheter can be used as a material for forming the parent catheter 2 and the child catheter 3.
For example, polyolefin (eg, polyethylene, polypropylene, ethylene-polypropylene copolymer), polyvinyl chloride, polyamide, polyurethane, polyester, fluororesin (eg, polytetrafluoroethylene (PTFE), tetrafluoroethylene hexafluoropropylene copolymer ( FEP)), silicone rubber and the like can be used. Of these, fluororesins, polyesters and polyurethanes are particularly preferred.

The parent catheter 2 and the child catheter 3
It is desirable to coat the outer peripheral surface and the inner peripheral surface with a biocompatible substance, particularly an antithrombotic substance. As the antithrombotic substance, for example, heparin, urokinase and the like can be suitably used. The length of the cut 7 is about 2-3 c
m, the number of which is preferably about 6 to 10 evenly arranged on the circumference.

As the material forming the cover member R, any conventionally known material can be used as long as it can protect the rear end portion 3a of the child catheter and the knob portion 6X. For example, a hard plastic is preferably used. Can be. Knob 6X is provided on the inner surface of cover member R (the inner peripheral surface of large-diameter portion Rb).
May be formed to mesh with the anti-slip irregularities.

The large-diameter portions b of the half portions R1 and R2 in which the inner peripheral surface of the large-diameter portion Rb of the cover member R is formed in a perfect circle
One end is connected to each other by a hinge c as shown in FIG. 7 to open and close the two ends. At the time of closing, the engaging concave portion d and the engaging convex portion e provided at the other end are engaged and mounted. The cover member R is not limited to the above-described embodiment as long as the cover member R is detachable and can protect the child catheter rear end 3a and the knob 6X of the stud valve 6.

Although the cut 7 is provided along the longitudinal direction at the distal end 2A of the parent catheter 2 in the above embodiment, it may be provided at an angle to the longitudinal direction as shown in FIG. 9 (a),
As shown in (b), a reinforcing material S made of a material having a higher elastic modulus (Young's modulus) than the material of the parent catheter 2 may be arranged. Each reinforcing member S extends along the cut 7 to a position slightly outside of both ends of the cut 7. This reinforcing material S does not necessarily need to be embedded in the strip 7a of the parent catheter 2, and may be attached to the outer peripheral surface or the inner peripheral surface of the tube 2. Thereby, even if the strip 7a hits the blood vessel wall, it can be easily expanded without being crushed.

As the reinforcing material S, any material having a higher elastic modulus (Young's modulus) than the material of the parent catheter 2 may be used, and a plastic or metal strip, a filament, or the like can be preferably used. Examples of the plastic include polyimide and aromatic polyamide, and examples of the metal include stainless steel. The present invention relates to a double-lumen catheter for hemodialysis according to the above embodiment, in which blood is taken out of the body from a cut 7 in which the parent catheter tip 2A is expanded in a basket shape and blood is returned to the body from the tip of the child catheter 3. Although described above, the present invention is not limited to this. The rear end of the slidable child catheter is extended behind the Y-shaped connector connected to the parent catheter, and the stud valve provided at the rear end of the Y-shaped connector is used for the child. Any form may be used as long as it is a double lumen catheter having a structure in which the rear end of the catheter is locked.

[0020]

As described above, the present invention relates to a double-lumen catheter in which a stud valve for locking the rear end of a slidable child catheter is provided at the rear end of the Y-type connector. Since the cover member that covers the stud valve of the section and the rear end of the child catheter is detachably provided, damage due to bending of the child catheter and loosening of the stud valve can be prevented.

[Brief description of the drawings]

FIG. 1A is a front view showing a part of a hemodialysis catheter, which is an example of a double-lumen catheter of the present invention, with a part omitted, and FIG. It is a principal part front view which shows a state.

FIG. 2 is an enlarged sectional view taken along the line AA of FIG.

FIG. 3A is an enlarged sectional view of a stud valve, and FIG.
FIG. 3 is a view taken along the line BB in FIG.

FIG. 4 is an enlarged front view of a main part showing a state where the distal end portion of the catheter in FIG. 1 is opened in a basket shape.

FIG. 5 is a view of a half portion of the cover member viewed from a direction of arrows CC in FIG. 1B;

FIG. 6 is an enlarged front view showing the circulation of blood at the distal end portion of the catheter which is expanded in a basket shape in the blood vessel.

FIG. 7 is a front view showing another example of the cover member in an open state.

FIG. 8 is an enlarged front view of a main part showing another example of the double-lumen catheter of the present invention.

FIGS. 9A and 9B are enlarged front views of a main part showing still another example of the double-lumen catheter of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Double lumen type catheter 2 Parent catheter 2A Tip part 3 Child catheter 3a Rear end part 4 Y-type connector 4X Connector main body 4Y Branch part 4a Front end 5 Connection part 5a Flange part 6 Stud valve 6X Knob 7 Cut 7a Strip 8 Tip tip 9 Blood vessel R Cover member R1, R2 Half part

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Claims (4)

(57) [Claims] A child catheter is slidably mounted on a parent catheter, and a rear end of the parent catheter has a branch path.
A stud valve for connecting to the front end of the type connector, extending the rear end of the child catheter so as to penetrate the Y-type connector backward, and locking the rear end of the child catheter to the rear end of the Y-type connector. 2. A double-lumen catheter, wherein a cover member for covering a stud valve at the rear end of the Y-type connector and a rear end of the secondary catheter is detachably provided. 2. The cover member comprises left and right divided halves, and the left and right halves are detachable.
2. The double lumen catheter according to item 1. 3. The double-lumen catheter according to claim 1, wherein the knob of the stud valve is provided with anti-slip irregularities, and the inner surface of the cover member is formed with irregularities that mesh with the anti-slip irregularities. 4. The distal end of the parent catheter and the distal end of the child catheter are connected to each other, and a plurality of strips are formed at the distal end of the parent catheter by a plurality of cuts extending in the longitudinal direction. The double-lumen catheter according to claim 1, 2, or 3, wherein the catheter can be expanded and converged in a basket shape by reciprocating the catheter in a longitudinal direction.