JP2001224692A - Catheter for endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a catheter for an endoscope less prone to form a bending nature at a mandrel wire even by carelessly bending and not receiving an influence of a chemical passed through a flexible tube by the wire. SOLUTION: The mandrel wire 4 is formed of a wire made of a superelastic alloy, and disposed along a part except the vicinity of the end of the flexible tube 1 in a state in which the wire 4 is isolated from a liquid supply passage 2.

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 inserted into and removed from a treatment tool insertion channel of an endoscope for spraying a drug solution into a body cavity.

[0002]

2. Description of the Related Art In general, an endoscope catheter has a flexible tube made of an ethylene tetrafluoride resin tube or the like, and an injection mouthpiece to which a syringe or the like can be connected is attached to a base end of the tube.

[0003] In order to prevent the flexible tube from being bent at the time of the insertion operation into the treatment instrument insertion channel, a stainless steel core wire is loosely inserted through the flexible tube.

[0004]

As described above, since the core metal wire is passed through the flexible tube, the stiffness of the flexible tube is reinforced. Can be pushed into the treatment instrument insertion channel without being bent by general use.

[0005] However, once the flexible tube is bent due to careless operation or the like, it becomes rather difficult to return the inner core wire to the original straight state due to the bending tendency of the inner core wire. The sex tube also bends and the life is shortened. Also, depending on the type of chemical solution passed through the flexible tube, the core metal may be discolored or deteriorated.

Accordingly, the present invention is directed to an endoscope catheter in which a cored wire is unlikely to be bent even if it is bent inadvertently, and the cored wire is not affected by a chemical solution passed through a flexible tube. The purpose is to provide.

[0007]

In order to achieve the above object, an endoscope catheter according to the present invention comprises: a flexible tube having a liquid supply path formed along the entire length in the axial direction; Endoscope catheter having an injecting tool connecting member provided at the proximal end of a flexible tube for injecting a liquid into the tube, and a cored wire for reinforcing the stiffness of the flexible tube In the above, the core metal wire is formed of a wire made of a superelastic alloy, and is arranged along a portion other than the vicinity of the distal end of the flexible tube in a state of being isolated from the liquid supply path.

The superelastic alloy forming the core metal wire may be a nickel-titanium alloy. Then, the core metal wire may be embedded in the flexible tube, or may be arranged along the outer surface of the flexible tube.

[0009]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows the overall configuration of an endoscope catheter according to a first embodiment of the present invention, and FIG. 2 shows a II-II section thereof.

Reference numeral 1 denotes a flexible tube that is inserted into and removed from a treatment tool insertion channel of an endoscope (not shown), and is formed of, for example, ethylene tetrafluoride resin. The flexible tube 1 is a so-called multi-lumen tube, in which a liquid feed path 2 is formed over the entire length in the axial direction, and a wire insertion hole 3 having a smaller sectional shape than the liquid feed path 2 is provided. 2 is formed in the axial direction so as to be separated from the entire length.

An injector connecting member 5 for connecting an injector such as a syringe is attached to the proximal end of the liquid feed path 2. Since the injector connecting member 5 is made of metal or plastic and directly communicates with the liquid feed path 2, it is possible to inject a chemical solution from the injector into the injector connecting member 5 and eject it from the tip of the liquid feed path 2. it can.

A core metal wire 4 is inserted into the wire insertion hole 3 of the flexible tube 1, and the tip of the core wire 4 is several centimeters to several tens centimeters from the tip of the flexible tube 1. It is located behind. The base end of the cored wire 4 is located near the base end of the flexible tube 1.

As described above, since the core metal wire 4 is passed through the flexible tube 1, the stiffness of the flexible tube 1 is reinforced, and the flexible tube 1 is bent. And can be pushed into the treatment instrument insertion channel.

The core metal wire 4 is made of, for example, Ni-
A superelastic alloy wire made of a Ti (nickel-titanium) alloy or the like is used. A super-elastic alloy wire has a characteristic that it does not have a bending habit (or is very difficult to bend) even if it is bent with a small radius of curvature.

Therefore, even if the flexible tube 1 is bent at the portion where the core metal wire 4 is inserted due to carelessness or the like, the core metal wire 4 returns to a natural straight state. The use can be continued in the same state.

The front end of the wire insertion hole 3 in which the core metal wire 4 is not inserted is filled with an adhesive 6 such as an epoxy resin to seal the front end of the wire insertion hole 3. Further, the base end portion of the wire insertion hole 3 is sealed by heat welding or the like, and the tip end portion may be similarly sealed.

In this manner, the core metal wire 4 is completely isolated from other parts and is buried in the wire insertion hole 3, so that what kind of chemicals and the like pass through the liquid feed path 2. Even so, the chemical solution does not touch the cored bar wire 4, and the cored bar wire 4 does not discolor or deteriorate.

FIG. 3 shows an entire configuration of an endoscope catheter according to a second embodiment of the present invention, and FIG. 4 shows a cross section taken along line IV-IV of FIG. In this embodiment, a simple single-hole tube is used as the flexible tube 1, and the base end of the flexible tube 1 is spread in a trumpet shape by thermoforming or the like to form the injector connecting member 15. Have been.

A core metal wire 4 made of the same superelastic alloy wire as that of the first embodiment is arranged along the outer surface of the flexible tube 1. The distal end of the cored wire 4 is located several centimeters to several tens of centimeters behind the distal end of the flexible tube 1, and the proximal end of the cored wire 4 is located near the proximal end of the flexible tube 1. The points are the same as in the first embodiment.

The core wire 4 is inserted into a wire insertion tube 13 made of a thin synthetic resin tube, and the wire insertion tube 13 is joined to the outer peripheral surface of the flexible tube 1 by an adhesive 16. Wire insertion tube 1
Both ends of 3 are sealed with an adhesive 16.

[0021]

According to the present invention, the core metal wire is formed of a wire made of a superelastic alloy and arranged along a portion other than the vicinity of the tip of the flexible tube, so that the core metal wire is inadvertently used. Even if the flexible tube is bent at the portion where is inserted, the core metal wire returns to a natural straight state, so that it can be used in the same state as when it is new.

Further, since the core metal wire is arranged in a state of being isolated from the liquid feed path, the core metal wire is not affected by the chemical solution passed through the flexible tube and is discolored or deteriorated. There is no.

[Brief description of the drawings]

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

FIG. 2 is a sectional view taken along the line II-II in FIG. 1 of the first embodiment of the present invention.

FIG. 3 is a side sectional view of an endoscope catheter according to a second embodiment of the present invention.

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3 of the second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flexible tube 2 Liquid feed path 3 Wire insertion hole 4 Core metal wire 5, 15 Injection tool connection member 13 Wire insertion tube

Claims (4)

[Claims] 1. A flexible tube in which a liquid feed path is formed over the entire length in the axial direction, and an injection provided at a base end of the flexible tube for injecting a liquid into the flexible tube. An endoscope catheter having a component connecting member and a cored wire for reinforcing the stiffness of the flexible tube, wherein the cored wire is formed of a wire made of a superelastic alloy, A catheter for an endoscope, wherein the catheter is disposed along a portion other than the vicinity of the distal end of the flexible tube in a state of being isolated from a liquid feeding path. 2. The super-elastic alloy forming the core metal wire,
The catheter for an endoscope according to claim 1, wherein the catheter is a nickel-titanium alloy. 3. The endoscope catheter according to claim 1, wherein the core metal wire is embedded in the flexible tube. 4. The catheter for an endoscope according to claim 1, wherein the core metal wire is arranged along an outer surface of the flexible tube.