JP4631478B2 - Catheter replacement guidewire - Google Patents

Description

  The present invention relates to a catheter replacement guide wire.

  For the purpose of discharging bodily fluids, gas and contents stored in the stomach and intestinal tract due to small intestine obstruction, 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 indwelling catheters used for such applications. The structure has a plurality of side holes at the front end and a connector for connecting to various lines such as various suction machines or injection machines at the rear end.

Multiple metal spheres and rings that make it easy to insert 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. An inductive part in which a weight such as a bead is embedded in a flexible resin in a bead shape is installed, external air is introduced to prevent excessive suction on the stomach wall and intestinal wall, and internal pressure is applied to the stomach and intestinal tract by injecting nutrients. In order to prevent the nutrient from flowing into the esophagus due to excessive pressure, there are two lumens with a sample lumen added to relieve internal pressure.
In addition, there are three lumens provided with a balloon that is 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., it is judged by the degree of backflow in the digestive tract. 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 exchange operation can be easily performed in a short time (for example, Patent Document 1).

  However, in both discharge of contents and injection of nutrients or the like, the catheter lumen is often clogged during indwelling, making it difficult to insert the guide wire. In this case, it is necessary to place the guide wire by the method of inserting it at the same time while simultaneously using the guide wire, which is the method of indwelling first, and the treatment may take a long time due to the insertion into the bent intestinal tract.

JP 2003-126264 A

  The present invention has been made in view of the above circumstances, and its purpose is to replace a catheter that can be easily replaced in a short time by a guide wire even when the lumen is clogged during placement of the catheter. Providing a guide wire.

According to the present invention, the guide on the rear end portion of the wire body, the wire diameter has an annular body made of a linear member is 1/2 or less of the outer diameter is provided in the guide wire body, said annular body The catheter replacement guide wire can be inserted into the catheter lumen at the time of replacement of the catheter and can be sheathed on the catheter.

  The guide wire for catheter exchange according to the present invention is used when exchanging a catheter placed in a body cavity, and an annular body provided at the rear end of the guide wire even when the inside of the catheter is clogged Thus, the catheter outer periphery can be inserted into the body cavity as a guide.

Said annular body, Ri linear member der wire diameter of the wire-like member, by 1/2 or less der Rukoto the outer diameter of the guide wire body, so as to extend the annular body in a circular linear direction By crushing, the passage resistance when inserted into the catheter lumen can be reduced.

  ADVANTAGE OF THE INVENTION According to this invention, even when clogging arises in the lumen | rumen during indwelling of a catheter, the guide wire for catheter replacement | exchange which can perform the replacement | exchange operation of the catheter by a guide wire in a short time can be provided.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In all the drawings, common constituent elements are denoted by the same reference numerals, and detailed description will be appropriately omitted in the following description.

  As shown in FIG. 1, the catheter replacement guide wire includes a core wire (1), a coil spring (2), a distal end fixing portion (3), a rear end fixing portion (4), and an annular body (5). The core wire (1) is made of an elastic metal such as a stainless steel wire having a total length of 200 to 5000 mm and an outer diameter of 0.1 to 1.0 mm, a shape memory alloy wire, a piano wire, and the flexibility gradually increases toward the tip. Thus, it is preferable that the taper part (6) and the small diameter part (7) are formed. In order to give rigidity to the guide wire, the outer diameter of the core wire (1) is preferably as large as possible, and is preferably the same as the inner diameter of the coil spring (2). Moreover, you may be comprised with the strand wire of the several metal fine wire.

  The coil spring (2) is made of a metal exhibiting elasticity such as a stainless wire having a diameter of 0.05 to 0.3 mm, a shape memory alloy wire, or a piano wire, and the entire guide wire has a diameter of 0.2 to 2.0 mm. Is covered with the core wire (1). The core wire (1) and the coil spring (2) are fixed at both ends by a method such as welding, brazing or caulking. The front end fixing part (3) is hemispherically shaped, and the rear end fixing part (4) is fixed at the front end side by the above-mentioned various methods such as welding of the core wire (1) and the coil spring (2). The rear end side is similarly fixed to the annular body (5) by a method such as welding.

  The annular body (5) is preferably a stranded wire of a plurality of fine wires having a diameter of 0.2 mm or less made of a metal exhibiting elasticity such as a stainless steel wire, a shape memory alloy wire, and a piano wire, and the outer diameter is 1 / of the guide wire outer diameter. It is desirable that it is 2 or less. The inner diameter of the annular portion of the annular body (5) is set to be equal to or larger than the outer diameter of the catheter used for replacement. These will be described later, but in order to reduce the passage resistance when the annular body (5) is inserted into the catheter lumen by being crushed so as to extend in a circular linear direction, The inner diameter of the annular portion is preferably set to be equal to or larger than the outer diameter of the catheter used for replacement so that the annular body (5) is sheathed on the catheter.

  The coil spring (2) may be coated with a fluororesin or the like in order to improve slipperiness with a catheter, body tissue or the like. Further, as another embodiment used as a general medical guide wire, the core wire (1) is made of polyamide without using the coil spring (2), the front end fixing portion (3), and the rear end fixing portion (4). There are guide wires coated with resin such as resin and polyurethane resin, and guide wires coated with hydrogel such as collagen, polyvinyl pyrrolidone, and polyacrylamide. An annular body (5) is installed on the rear end side. This is also a preferred embodiment. In this case, the material of the annular body (5) does not need to be a metal, and although it is advantageous in manufacturing that it is the same resin as the covering material of the core wire (1), it is not limited. As a manufacturing method of the annular body (5), the covering material at the rear end of the guide wire is lengthened and formed into an annular shape by thermal processing or high-frequency processing, or by separately welding the annular body (5) molded by high-frequency welding. .

  As described above, the annular body (5) is not limited to the embodiment as long as it can be externally attached to the catheter and can be inserted into the lumen, and is not limited to the embodiment. ) And yarns can be installed.

  Next, a catheter replacement method will be described with reference to FIGS. 2 and 3 are exchange methods when the indwelling catheter is not clogged, and FIGS. 4 and 5 are exchange methods when the indwelling catheter is clogged.

When the indwelling catheter is not clogged, the indwelling catheter (11) is inserted from the rear end of the indwelling catheter (11) through the distal end fixing portion (3) of the guide wire as shown in FIG. Next, as shown in FIG. 3, the annular catheter (5) at the rear end of the guide wire is crushed so as to extend in the circular linear direction, and the exchange catheter (12) is externally inserted from the distal end side and inserted. Once in position, the guide wire is removed and the catheter exchange is complete.

  On the other hand, when the indwelling catheter is clogged, first, the connector part of the indwelling catheter (11) terminal is cut. Then, as shown in FIG. 4, the loop of the guide wire annular body (5) is externally inserted from the rear end cutting portion of the indwelling catheter (11), inserted, and the indwelling catheter (11) is removed from the body. Next, the replacement catheter (12) is externally inserted into the distal end fixing portion (2) of the guide wire that has come out of the body and inserted, and when the replacement catheter (12) is placed at an appropriate position, the guide wire is as shown in FIG. To remove the catheter and complete the catheter exchange.

It is a sectional side view which shows the structure of the guide wire for catheter replacement | exchange which becomes one Example of this invention. The figure which shows the guide wire operation in the case of catheter exchange when clogging has not arisen in the indwelling catheter used as one Example of this invention, and is a sectional side view which shows the state which has inserted the guide wire front-end | tip part from the rear end of the indwelling catheter FIG. The figure which shows the guide wire operation in the case of catheter replacement | exchange when the clogging has not arisen in the indwelling catheter used as one Example of this invention, and the side which shows the state which carries out exterior insertion of the exchange catheter front-end | tip part from a guide wire rear end It is sectional drawing. It is a figure which shows the guide wire operation in the case of catheter replacement | exchange when the front-end | tip of an indwelling catheter produced clogging with the foreign material etc. which become one Example of this invention. It is a sectional side view which shows the state currently inserted. The figure which shows the guide wire operation in the case of catheter replacement | exchange when the front-end | tip of an indwelling catheter produced clogging with the foreign material etc. which become one Example of this invention, The state which has extracted the guide wire from the rear end of an exchange catheter It is a sectional side view shown.

Explanation of symbols

1 core wire
2 Coil spring 3 Front end fixing part 4 Rear end fixing part
5 annular body 6 taper part 7 narrow diameter part 11 indwelling catheter 12 exchange catheter 13 foreign substance 14 guide wire

Claims (1)

A guide wire for exchanging a catheter, and an annular body made of a linear member whose wire diameter is 1/2 or less of the outer diameter of the guide wire body is provided at the rear end of the guide wire body , The guide wire for exchanging a catheter, wherein the annular body can be inserted into the lumen of the catheter at the time of exchanging the catheter and can be sheathed on the catheter.

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