JP4321291B2 - catheter - Google Patents

Description

The present invention relates to a catheter.

  For the purpose of draining bodily fluids, gas and contents stored in the stomach and intestinal tract due to small intestine obstruction, etc., and for the purpose of injecting nutrients and chemicals because the brain can not supply nutrition due to brain damage etc. The catheter is inserted through the nasal cavity or the body surface, and the distal end of the catheter is pushed into the stomach or intestinal tract.

  There are various types of conventional catheters used for such applications. The structure includes a plurality of side holes at the front end and a connector for connecting to a line of various suction machines or injection machines at the rear end. A plurality of metal spheres and rings that facilitate the insertion of the catheter into the distal end, beginning with a single-lumen catheter that only drains the contents of the stomach or intestinal tract out of the body or injects nutrients, etc. In some cases, a guiding portion in which a weight such as a bead is embedded in a flexible resin in a bead shape is installed.

In addition, to prevent excessive suction to the stomach wall and intestinal wall, to introduce outside air, or to prevent the nutrients from flowing into the esophagus due to excessive internal pressure in the stomach and intestinal tract due to the injection of nutrients There are two lumens with a sample lumen for releasing internal pressure, and three lumens with a balloon inflated by fluid injection for the purpose of introducing and maintaining the catheter tip at an appropriate position.
The indwelling position of the stomach or intestinal tract is selected according to the purpose of the catheter, and the contents are retained when the contents are discharged. When injecting nutrients, etc. Is done.

  The catheter is inserted from the nasal cavity or body surface. Generally, when the catheter tip is placed in the stomach, it is introduced only with the catheter, and when placed in the intestinal tract beyond the stomach, a guide wire is used in combination. While being implemented. After that, periodic replacement operations will be performed. If the latter is placed in the intestinal tract, the guide wire is inserted into the catheter, the catheter is removed while leaving the guide wire in the body, and the guide is again guided. When a new catheter is introduced through a wire, an easy exchange operation can be performed in a short time.

However, in both the discharge of contents and the injection of nutrients, the catheter lumen is often clogged during placement, making it difficult to insert the guide wire. In this case, the guide is the first placement method. It is necessary to place the wire in the same way while using the wire at the same time, which makes it difficult to insert into the bent intestine, and the treatment may take a long time.
Japanese Patent Application No. 02-243300 Japanese Utility Model Application No. 02-085583

  An object of the present invention is to solve such problems of conventional catheters, and even when the lumen is clogged during placement of the catheter, the catheter can be replaced with a guide wire in a short time. A catheter that can be easily replaced is provided.

Such an object is achieved by the present invention described in the following (1) to ( 2 ).
(1) A catheter having a first lumen having a distal end opened and a connector installed on the rear end, and a second lumen having a distal end sealed by a sealing portion,
When the first lumen is clogged , the sealing portion is inserted into the second lumen through the thin-film guide wire insertion portion formed on the rear end side of the catheter or the connector. A catheter that can be exchanged for another catheter by being penetrated by a guide wire.
(2) The catheter according to claim 1, wherein a plurality of side holes communicating with the inside of the first lumen are provided in the vicinity of the distal end side of the catheter.

  According to the present invention, the catheter is a catheter having a guide wire introduction lumen that is not normally open on the surface, and even when clogging occurs during placement, the guide wire can be introduced and the catheter can be replaced by the guide wire. Since it can be performed, the treatment can be completed easily in a short time.

Hereinafter, the present invention will be described in detail with reference to the drawings. 1 and 2 are views showing the structure of a catheter according to an embodiment of the present invention.
As shown in FIG. 1, the catheter according to the present invention includes a first lumen for discharging the contents of the catheter or injecting a nutrient, and insertion of a guide wire even when the first lumen is clogged. It is the catheter main body provided with the several lumen | rumen which consists of the 2nd lumen | rumen installed so that it could perform. It is also a desirable embodiment that a guide portion in which a weight such as a plurality of metal balls or rings is embedded in a flexible resin or a balloon is installed at the distal end of the catheter body.

  The structure of the catheter body (1) is a catheter having two lumens consisting of a first lumen (4) and a second lumen (5), and the first lumen (4) is formed from the distal end of the catheter body (1). Although it opens to the rear end, the second lumen (5) is sealed with a thin film (6) having a film strength that can be easily penetrated by introduction from the rear side of the guide wire (10). . In the vicinity of the distal end of the catheter body (1), a plurality of side holes (3) communicating with the inside and outside of the first lumen (4) are provided. On the rear end side of the first lumen (4), a connector (2) for connecting to a line such as a suction machine or an injection machine is installed. On the rear end side of the catheter body (1) in the second lumen (5), there is a guide wire insertion part (7), which is in a sealed state like the thin film (6) to visually recognize the position. A simple specification with printing may be used, and it is desirable to form a funnel-shaped inlet so that the guide wire (10) can be easily introduced. The guide wire insertion part (7) preferably has a shape that can be easily wiped off even if dirt is deposited during placement, and more specifically, if the film is thin, press the tip of the guide wire (10) against the printed display part. If the funnel-shaped inlet is formed, it is desirable to provide a cap for sealing when the funnel-shaped inlet is formed, and the guide wire (10 ) Is achieved. The guide wire insertion portion (7) may be installed on the connector (2). The thin film (6) at the distal end of the catheter prevents clogging during indwelling and makes it impossible to introduce the guide wire (10), and the thin film (6) is opened only at the distal end side that exhibits its function. A check valve shape or a similar specification may be used.

  Next, regarding the materials used, the catheter body (1) may be made of polyurethane resin, vinyl chloride resin, silicone rubber or the like from the viewpoint of insertion and placement in the body, as in the case of commonly used catheters, or these A composite material may be used. It is also desirable to apply a lubricity treatment to the outer surface or the first lumen (4), and various hydrogel coatings are practical in addition to fluorine resin coating and kneading of silicone oil into the catheter resin. In view of toxicity to the human body, collagen, polyvinyl pyrrolidone, polyacrylamide, etc. are preferable, and the hydrogel is fixed to the catheter body (1) by coating the hydrogel in solution before coating the catheter with glutaraldehyde. A method of cross-linking with a polymer, a method of cross-linking these hydrogel monomers with a polymerization initiator after coating, a method of coating a catheter with a hydrogel solution modified with a photoreactive cross-linking agent, and fixing to the catheter by light irradiation, etc. Available. Furthermore, it is also desirable that the catheter body (1) be kneaded or installed in a line with a radiopaque material such as barium sulfate or bismuth oxide.

The material of the connector (2) is not particularly limited, but it is preferable to use hard vinyl chloride resin, polycarbonate resin, ABS resin, silicone rubber or the like.
The material of the thin film (6) may be selected in view of the material and processing method of the catheter body (1), and the sealing material may be sealed by welding, bonding attachment of the separate parts or the catheter body material itself. However, since the penetration strength of the guide wire (10) differs depending on the material, it is set to an appropriate thickness.

  In the method for using the catheter according to the present invention, an exchange method when the catheter is clogged will be described. Since the guide wire (10) cannot be inserted into the first lumen (4) of the catheter, after the surface of the catheter body (1) in the vicinity of the guide wire insertion portion (7) is wiped, the guide wire (10) Is introduced from the insertion part. The guide wire (10) is placed in the stomach or intestinal tract by pushing through the second lumen (5) and penetrating the thin film (6) at the tip. Next, the catheter is removed while leaving the guide wire (10) in the body, the guide wire (10) is introduced to the target site while covering the first lumen (4) of the new catheter, and finally the guide wire (10). The replacement operation is completed by removing.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the structure of the catheter used as one Example of this invention, (a) It is each sectional drawing which shows the front and (b) side. It is a figure which shows the structure of the catheter used as one Example of this invention, and is a sectional side view which shows the state which inserted the guide wire from the guide wire insertion port of the catheter, and protruded from the front-end | tip of the catheter.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Catheter main body 2 Connector 3 Side hole 4 1st lumen 5 2nd lumen 6 Thin film 7 Guide wire insertion part 10 Guide wire

Claims (2)

A catheter having a first lumen in which a distal end side is opened and a connector is installed on a rear end side; and a second lumen in which a distal end is sealed by a sealing portion;
When the first lumen is clogged , the sealing portion penetrates the rear end side of the catheter or a thin film guide wire insertion portion that is not normally opened on the surface. A catheter that can be exchanged for another catheter by being penetrated by a guide wire inserted into the second lumen.   The catheter according to claim 1, wherein a plurality of side holes communicating with the inside of the first lumen are provided in the vicinity of the distal end side of the catheter.