JPH0511878Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a catheter used in the medical field.

[Problems that conventional technology and ideas try to solve]

Conventional catheters of this type are known to be used for diagnosis and examination of blood vessels, gastrointestinal tracts, tracheas, urinary tracts, fallopian tubes, etc. (hereinafter referred to as narrow tubes of living bodies).

By the way, in order to facilitate insertion into the narrow diameter tube of the living body, it is necessary to reduce the outer diameter, especially the outer diameter of the tip.

Further, the distal end of the catheter is made swingable or curved in a predetermined shape in order to facilitate insertion into a narrow diameter tube or to ensure observation.

In order to curve the distal end of the catheter in the desired direction inside the narrow tube of the living body, the uninserted part of the catheter that remains outside the living body is grasped and rotated. Because the outer diameter of the catheter is small and flexible enough to bend, it is difficult to transmit the torque during rotation to the tip, which poses an obstacle to reducing the outer diameter. I was getting used to it.

The purpose of the present invention is to keep the outer diameter of the catheter small and to reliably transmit rotational torque to the tip.

[Means to solve the problem]

The catheter according to the present invention is equipped with a multi-lumen tube having a curved tip or which can be freely curved, and extends from a predetermined position of the non-insertion part that always remains outside the living body to the proximal end of the multi-lumen tube. It was configured as a torque tube with braid. In addition, a multi-lumen tube is provided from a predetermined position to the most distal end of the non-insertion portion that always remains outside the living body, and most or the entirety of the multi-lumen tube is provided from the most distal end of the multi-lumen tube except for the distal end within a predetermined range, The multi-lumen tube was covered with a torque tube having a braid, and the tip of the multi-lumen tube was curved or could be bent freely.

[Effect]

Since the area from the predetermined position of the non-insertion part to the vicinity of the distal end is formed by a torque tube with a braid, when a rotational torque is applied to the proximal end of this torque tube outside the living body, the rotational torque is reliably applied to the distal end. is transmitted.

The torque tube has a braid and is highly flexible.
It has low insertion resistance into a small diameter tube of a living body and can be inserted smoothly.

Furthermore, by forming the distal end portion into a multi-lumen tube, guidance and insertion into a narrow diameter tube of a living body becomes even smoother.

In addition, if only a torque tube is used from the predetermined position of the non-insertion part to the proximal end of the multi-lumen tube, image guides, light guides, laser fibers, etc. can be inserted individually, making the insertion and assembly work easier. Become.

〔Example〕

An embodiment will be described with reference to the drawings. The catheter 1 shown in Fig. 1 is inserted into a narrow tube of a living body to observe the inside (diagnosis/inspection), and also allows laser surgery to be performed at the same time. Something,
It can be divided into an insertion part 2 that is inserted into a small diameter tube of a living body, and a non-insertion part 3 that always remains outside the living body.

The non-insertable portion 3 is provided with branch portions 4, 4, lead portions 5, connector portions 6, etc. for coupling with each device.

As shown in FIGS. 1, 2, and 4, the tip 7
The multi-lumen tube 8 is made of a flexible plastic material such as PE, PVC, or polyurethane. And the non-insertion part 3 that always remains outside the living body.
A torque tube 9 is formed from the position of the front branch part 4 to the base end 8a of the multi-lumen tube 8.

This torque tube 9 has an ultra-fine braid, and as shown in FIG. It has a three-layer structure consisting of a hard ultra-fine braid 11 and an outer layer 12 of polyurethane, PE, PVC, etc. The Young's modulus E of the metal, carbon, boron, etc. for the ultrafine braid 11 is preferably 3000 Kg/mm ² or more. As the above-mentioned polyimide resin, polyamideimide and polyesterimide are suitable.

In the specific example of FIG. 4 (FIGS. 1 and 2), the multi-lumen tube 8 includes a fiberscope lumen 15 into which an image guide 13 and a light guide 14 are inserted, and a flushing liquid injection tube 23. A flash guide wire lumen 16 into which is inserted, an analysis fiber lumen 18 into which an analysis fiber 17 is inserted, an oscillation mechanism lumen 20 into which an oscillation mechanism 19 is inserted, a laser guide fiber for guiding surgical laser light. 21
It has a laser lumen 22 etc. into which the laser lumen 22 is inserted.

The swinging mechanism 19 includes a guide stainless steel tube 24 and an operating wire 25 inserted therein.
The tip of the tube 24 is fixed to the proximal end to the middle portion of the multi-lumen tube 8, and only the operating wire 25 extends from it to the tip (as shown in the figure). This is fixed to the most distal end of the multi-lumen tube 8 (via an omitted fixing device), and curves the multi-lumen tube 8 made of a soft material, as shown by the imaginary line in FIG. Note that the length L of the exposed multi-lumen tube 8 is preferably about 100 to 300 mm, for example, for endoscopic viewing of blood vessels.

Therefore, the above-mentioned image guide 13, light guide 14, analysis fiber 17, swinging mechanism 1
9. The laser light guiding fiber 21, the flashing liquid injection tube 23, etc. are inserted in the torque tube 9 in a free state, that is, in a so-called "separate" state from the proximal end surface of the multi-lumen tube 8. It has the advantage of being highly flexible and easy to insert and assemble.

In addition to the above-mentioned embodiments, it is also possible to insert a suction tube, a balloon expansion tube, etc., or, conversely, to omit appropriate tubes, fibers, etc.

Next, FIG. 5 shows another embodiment, in which a long multi-lumen tube 8 is arranged from the non-insertion part 3 (see FIG. 1) remaining outside the living body to the distal end 27. And multi-lumen tube 8
Covering the entire torque tube 9 from the leading edge 27 except for the length L of about 100 to 300 mm,
It has an integrated configuration. Of course, it is also desirable to extend the multi-lumen tube 8 closer to the user's hand than the torque tube 9 at the proximal end.

FIG. 5 shows a case where the tip 7 of the multi-lumen tube 8 has been given a desired curvature in advance, and in this case, the swinging mechanism of the previous embodiment can be omitted.

It is preferable to add this curved shape to the multi-lumen tube 8 shown in FIGS. 1 and 2, and it is also possible to add a swinging mechanism to the multi-lumen tube 8 in place of the curved shape shown in FIG.

The method of use is when inserting the insertion part 2 of the catheter 1 into a small diameter tube of a living body and guiding it to a desired side at a branching part of the narrow diameter tube, or when inserting the tip 27 of the catheter 1 into a desired part of the narrow diameter tube. When you want to point the
As shown by arrow M in the figure, the proximal end of the torque tube 9 may be grasped by hand and rotated to match the direction in which the distal end portion 7 is easily curved. Torque tube 9
At this time, the rotational torque is effectively transmitted to the tip 7.

[Effect of idea]

The present invention is constructed as described above, and has the following significant effects.

The direction of curvature of the distal end 7 of the catheter can be smoothly changed outside the living body, and rotational torque is reliably transmitted to the distal end.

The torque tube 9 has the role of transmitting rotational torque to the multi-lumen tube 8 at the tip 7.
The (exposed portions of) each share the role of flexibly guiding the catheter into the narrow diameter tube of the living body, making it easier to use and making it possible to further reduce the outer diameter.

[Brief explanation of the drawing]

Fig. 1 is a front view of an embodiment of the present invention, Fig. 2 is an enlarged perspective view of the main part, Fig. 3 is an enlarged sectional view of the torque tube, Fig. 4 is a perspective view of the main part, and Fig. 5 is another embodiment. FIG. 3 is a perspective view of an example. 3... Non-insertion part, 7... Tip part, 8... Multi-lumen tube, 8a... Proximal end part, 9... Torque tube, 11... Braid, 27... Cutting edge.

Claims (1)

[Claims for Utility Model Registration] 1. A multi-lumen tube with a curved tip or a bendable function, and a proximal end of the multi-lumen tube from a predetermined position of the non-insertion part that always remains outside the living body. What is claimed is: 1. A catheter characterized in that a torque tube having a braid is constructed from the top to the bottom. 2. A multi-lumen tube is provided from a predetermined position to the most distal end of the non-insertion part that always remains outside the living body, and most or all of the multi-lumen tube is braided from the most distal end of the multi-lumen tube except for the distal end within a predetermined range. 1. A catheter characterized in that the distal end of the multi-lumen tube is curved or can be freely curved.