JP2002224221A - Catheter for endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a catheter for an endoscope which can be easily inserted into a lumen of a deep site in the body such as the biliary tract, through a instrument insertion channel of a side-viewing endoscope. SOLUTION: A progression direction guide member 3 consisting of a coil spring is connected in series to the distal end of a flexible liquid feed tube 1 inserted and removed into and from the medical treatment instrument insertion channel 11 of the endoscope 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a catheter for an endoscope which is used for injecting a contrast agent into a body lumen through a treatment tool insertion channel of an endoscope.

[0002]

2. Description of the Related Art When performing cholangiography endoscopically,
A technique is used in which a distal end of an endoscope catheter is inserted into the biliary tract from the duodenum via a treatment instrument insertion channel of a duodenal fiberscope, and a contrast agent is injected into the biliary tract.

[0003] A conventional endoscope catheter used in such a case is one in which a distal end of a liquid feeding tube made of a tetrafluoroethylene resin tube is simply rounded, or a metallic distal end having such a shape. The tip was attached to the tip of a tetrafluoroethylene resin tube.

[0004]

However, as illustrated in FIG. 5, a liquid feeding tube 1 made of a tetrafluoroethylene resin tube is a treatment tool for a duodenal fiberscope 10 which is a side-view type endoscope. When the portion that is passed through the insertion channel 11 and protrudes from the treatment tool protruding opening portion 12 and is bent with a small radius of curvature, the protruding portion is curled with a bending habit.

[0005] Therefore, the distal end of the liquid feeding tube 1 pushed out from the treatment tool outlet 12 does not go straight, but tries to move in the curl direction as shown by the arrow in the figure. Cholangiography was one of the difficult procedures because it could not be easily inserted into the stomach.

Accordingly, the present invention provides an endoscope catheter which can be easily inserted into a deep lumen of a body such as a biliary tract via a treatment tool insertion channel of a side-viewing type endoscope. The purpose is to provide.

[0007]

In order to achieve the above object, an endoscope catheter according to the present invention is provided at a distal end of a flexible liquid feeding tube inserted into and removed from a treatment instrument insertion channel of an endoscope. And a traveling direction guide member composed of a coil spring is connected in series.

The outer diameter of the traveling direction guide member is preferably intermediate between the outer diameter and the inner diameter of the distal end portion of the liquid feeding tube, and the length of the traveling direction guiding member is set to be equal to the length of the liquid feeding tube. The diameter is preferably in the range of 5 to 20 times the outer diameter of the tube.

Further, the traveling direction guide member may have a curved shape in a natural state, and the coil spring may be a coil spring tightly wound with a constant diameter.

[0010]

Embodiments of the present invention will be described with reference to the drawings. FIG. 2 shows the entire configuration of the catheter for an endoscope according to the first embodiment of the present invention, which is a flexible and slippery liquid feeding tube 1 made of, for example, a tetrafluoroethylene resin tube. A liquid inlet 2 is attached to the base end. Alternatively, a core metal for preventing buckling may be inserted into the liquid feeding tube 1 from the liquid inlet 2 side.

The liquid feeding tube 1 has, for example, an outer diameter of about 2 mm and a length of about 2 m, and is made of ethylene tetrafluoride-propylene hexafluoride copolymer (FEP),
Tubes made of various fluororesins such as ethylene tetrafluoride copolymer (ETFE) or ethylene tetrafluoride-perfluoroalkylvinyl ether copolymer (PFA) may be used, and other materials may be used. No problem.

A traveling direction guide member 3 composed of a coil spring formed, for example, by tightly winding a stainless steel wire with a fixed diameter, is connected straight to the tip of the liquid sending tube 1 in series.

FIG. 1 shows a distal end of a liquid feeding tube 1 and a traveling direction guide member 3 connected thereto, and a proximal end portion 3a of the traveling direction guiding member 3 is extended in pitch so that the liquid feeding tube 1 It is tightly screwed into the tip. At the time of the connection, it is preferable to heat the proximal end portion 3a of the traveling direction guide member 3 or the distal end portion of the liquid feeding tube 1.

The distal end portion 3b of the traveling direction guide member 3 is smoothly rounded so as not to have a sharp portion. However,
A tip or the like (not shown) having a through hole formed in the axial direction may be added to the tip 3b of the traveling direction guide member 3.

The traveling direction guide member 3 has a straight shape in a natural state, but bends freely by elasticity when an external force acts, and returns to its original shape when the external force is removed. Therefore, the material is not limited to stainless steel wire, and may be other metals or nonmetals such as hard plastics.

The length L of the traveling direction guide member 3 is preferably in the range of about 5 to 20 times the outer diameter of the liquid feed tube 1 from the viewpoint of guiding the insertion of the liquid feed tube 1.
Further, the outer diameter dimension D of the traveling direction guide member 3 is preferably a size between the outer diameter dimension and the inner diameter dimension of the liquid feeding tube 1 from the viewpoint of the function and the connectivity with the liquid feeding tube 1.

FIG. 3 shows a duodenal fiberscope 10 in which the endoscope catheter of the above embodiment is a side-view type endoscope.
This shows a state in which the distal end portion of the liquid feed tube 1 is pushed out from the treatment instrument outlet 12 and the traveling direction guide member 3 is pushed into the biliary tract 101. Have been.

In such a process, the liquid feeding tube 1
Is curled with a curl when passing through the treatment tool protrusion port 12, but the curving habit is not attached to the advancing direction guiding member 3 provided on the front side thereof, and the advancing direction guiding member 3 is not curled. 3 is elastically deformed along the duct shape of the biliary tract 101 and pushed into the biliary tract 101, and is guided by the liquid feed tube 1 to reach the inside of the biliary tract 101.

In this manner, the distal end of the liquid feeding tube 1 is easily inserted into the biliary tract 101 simply by pushing the liquid feeding tube 1 out of the treatment tool outlet 12 of the endoscope 10, and a contrast is formed in the biliary tract 101. An agent or the like can be injected.

FIG. 4 shows an entire configuration of an endoscope catheter according to a second embodiment of the present invention, in which a traveling direction guide member 3 is formed in a curved shape to some extent in a natural state.

With such a configuration, the biliary tract 10
In some cases, insertion into the pancreatic duct 102 shown in FIG. 3 is performed by changing the direction of the advancing direction guide member 3 by rotating the liquid feeding tube 1 around the axis from the hand side. Selective insertion and the like can also be performed.

The present invention is not limited to the above embodiment. For example, the insertion target of the endoscope catheter is not limited to the biliary tract or pancreatic duct, but may be any body lumen.
What is passed through the endoscope catheter is not limited to the contrast agent, and any liquid may be used.

[0023]

According to the present invention, the distal end of the flexible liquid feeding tube inserted into and removed from the treatment instrument insertion channel of the endoscope has:
By connecting the direction guide members consisting of coil springs in series, the guide is guided to the direction guide member that does not bend and is elastically deformed along the shape of the lumen by simply pushing out the liquid feed tube from the hand side. Then, the distal end of the liquid sending tube is easily inserted into the lumen deep inside the body.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a distal end portion of an endoscope catheter according to a first embodiment of the present invention.

FIG. 2 is an external view showing the entire configuration of the endoscope catheter according to the first embodiment of the present invention.

FIG. 3 is a schematic view showing a use state of the endoscope catheter according to the first embodiment of the present invention.

FIG. 4 is an external view showing an entire configuration of an endoscope catheter according to a second embodiment of the present invention.

FIG. 5 is a schematic view showing a use state of a conventional endoscope catheter.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 liquid feeding tube 3 traveling direction guide member 10 endoscope (duodenal fiberscope) 11 treatment tool insertion channel 12 treatment tool ejection opening 101 biliary tract

Claims (5)

[Claims] An advancing guide member comprising a coil spring is connected in series to a distal end of a flexible liquid feeding tube inserted into and removed from a treatment instrument insertion channel of an endoscope. Endoscope catheter. 2. The catheter for an endoscope according to claim 1, wherein an outer diameter of the traveling direction guide member is intermediate between an outer diameter and an inner diameter of a distal end portion of the liquid feeding tube. 3. The endoscope catheter according to claim 1, wherein a length of the traveling direction guide member is in a range of 5 to 20 times an outer diameter of the liquid feeding tube. 4. The endoscope catheter according to claim 1, wherein the traveling direction guide member has a curved shape in a natural state. 5. The catheter for an endoscope according to claim 1, wherein the coil spring is closely wound with a constant diameter.