JP4424826B2 - Endoscopic catheter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an endoscope catheter that is inserted into and removed from a treatment instrument insertion channel of an endoscope in order to spread a drug solution into a body cavity.
[0002]
[Prior art]
In general, an endoscope catheter is generally provided with an injection tool connection base to which a syringe barrel or the like can be connected to a proximal end of a flexible tube made of a tetrafluoroethylene resin tube or the like, and the flexible tube is connected to a treatment instrument insertion channel. A metal core wire made of stainless steel wire for preventing bending during the insertion operation is loosely inserted in the flexible tube.
[0003]
In general, such a metal core wire has a proximal end portion fixed to the injection tool connection base by soldering or the like, or a proximal end portion of the core metal wire is attached to a knob-like member that can be attached to and detached from the injection tool connection base. It was fixed by soldering.
[0004]
[Problems to be solved by the invention]
In order to prevent infection between patients, it is desirable that a treatment instrument such as an endoscopic catheter used for feeding a medical solution or the like into a human body is made as disposable as possible.
[0005]
For this purpose, it is necessary to make the endoscope catheter as inexpensive as possible, and there is a strong demand for a configuration with a small number of parts and easy assembly. However, in the conventional endoscope catheter as described above, there is a problem that assembly cost is required to connect and fix the proximal end portion of the cored wire.
[0006]
Accordingly, an object of the present invention is to provide an endoscope catheter that can significantly reduce the assembly cost for connecting and fixing the proximal end portion of the cored wire and can effectively reduce the cost. .
[0007]
[Means for Solving the Problems]
In order to achieve the above object, an endoscope catheter according to the present invention includes a flexible tube and an injection device connected to a proximal end portion of the flexible tube for injecting a liquid into the flexible tube. In an endoscope catheter having a connection base and a core metal wire for reinforcing the waist strength of the flexible tube, the proximal end portion of the core metal wire is connected to the flexible tube and the injection tool connection base. It is fixed there by being sandwiched between them.
[0008]
Note that the end of the injection tool connection base may be press-fitted into the proximal end portion of the flexible tube, and in that case, the injection tool connection base may be pressed into the inner surface of the flexible tube in the axial direction. Protrusions that prevent removal may be formed.
[0009]
In addition, a wire base end positioning portion for positioning the base end portion of the core metal wire may be formed in one or both of the flexible tube and the injection tool connecting base, A wire proximal end retaining portion that restricts the cored wire from coming out of the fixed portion by being bent and locked may be formed in the injection tool connection base.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows an overall configuration of an endoscope catheter according to a first embodiment of the present invention. Reference numeral 1 denotes a flexible tube that is inserted into and removed from a treatment instrument insertion channel of an endoscope (not shown). For example, it is made of tetrafluoroethylene resin or the like.
[0011]
The proximal end of the flexible tube 1 is connected and fixed to an injection tool connection base 2 to which an injection tool such as a syringe barrel can be connected. The injection tool connection base 2 is made of metal or plastic, and a chemical solution can be injected from the injection tool connection base 2 into the flexible tube 1 and ejected from the tip of the flexible tube 1.
[0012]
A cored bar wire 3 is inserted into the flexible tube 1. The distal end of the cored bar wire 3 is located, for example, within several centimeters to several tens of centimeters from the distal end of the flexible tube 1.
[0013]
As described above, the core metal wire 3 is passed through the flexible tube 1, whereby the strength of the waist of the flexible tube 1 is reinforced, and the treatment instrument without buckling the flexible tube 1. It can be pushed into the insertion channel.
[0014]
The proximal end portion of the core metal wire 3 is sandwiched between the flexible tube 1 and the injection tool connection base 2 at the connection portion between the flexible tube 1 and the injection tool connection base 2 and fixed thereto. The other parts are free.
[0015]
FIG. 2 shows a connecting portion between the flexible tube 1 and the injection tool connection base 2, and the cylindrical portion 21 protruding from the injection tool connection base 2 toward the front side is the flexible tube 1. It is press-fitted into the proximal end portion of the.
[0016]
Then, the pointed peripheral protrusion 22 that protrudes from the outer peripheral surface of the cylindrical portion 21 bites into the inner peripheral surface of the flexible tube 1 to prevent the flexible tube 1 from coming off in the axial direction. It has become.
[0017]
In this embodiment, the base end portion of the cored bar wire 3 extends from the end of the cylindrical portion 21 to the intermediate portion on the outer peripheral surface of the cylindrical portion 21 as shown in FIG. It is arranged along and is fixed there by the force pressed by the flexible tube 1.
[0018]
Positioning projections 23 are formed on the intermediate portion of the cylindrical portion 21 so that the base end surface of the cored bar wire 3 is in contact with the periphery, and the end of the flexible tube 1 where the cored bar wire 3 does not exist inside. Leakage from the connecting portion is prevented by the proximity portion 1a being in close contact with the entire outer periphery of the cylindrical portion 21.
[0019]
FIG. 4 shows a second embodiment of the connection portion between the flexible tube 1 and the injection tool connector 2, and as shown in FIG. 5 illustrating the VV cross section, the core metal wire 3 The proximal end portion is fitted into a guide groove 11 formed in the axial direction on the inner peripheral surface of the flexible tube 1 and is disposed in a positioned state.
[0020]
However, since the depth of the guide groove 11 is smaller than the diameter of the core metal wire 3, the core metal wire 3 disposed in the guide groove 11 is sandwiched between the flexible tube 1 and the injection tool connection cap 2. Attached and fixed there.
[0021]
FIG. 6 shows a third embodiment of the connection portion between the flexible tube 1 and the injection tool connection base 2, and the portion closer to the injection tool connection base 2 is thicker than the first cylindrical portion 21. The second cylindrical portion 26 is formed continuously with the first cylindrical portion 21, and both the cylindrical portions 21 and 26 are press-fitted and fixed to the proximal end portion of the flexible tube 1.
[0022]
The proximal end portion of the cored wire 3 is pressed and fixed by the flexible tube 1 at the first cylindrical portion 21, and the outer peripheral surface of the second cylindrical portion 26 is cut out into the inner peripheral surface of the flexible tube 1. Stopping circumferential protrusions 22 are formed to protrude.
[0023]
FIG. 7 shows two types of configurations of the VII-VII cross section in FIG. 6, and the base end portion of the cored wire 3 is arranged along the outer peripheral surface of the first cylindrical portion 21 as shown in FIG. Alternatively, as shown in (B), positioning may be performed by fitting into the guide groove 27 formed in the axial direction on the outer peripheral surface of the first cylindrical portion 21. The depth of the guide groove 27 is smaller than the diameter of the cored bar wire 3.
[0024]
FIG. 8 shows a fourth embodiment of the connection portion between the flexible tube 1 and the injection tool connection base 2, and the outer end surface of the first cylindrical portion 21 is bent by bending the end portion of the core metal wire 3. The other part is the same as that of the third embodiment shown in FIG. 6.
[0025]
By doing in this way, it becomes difficult for the base end part of the metal core wire 3 to come out from the fixing | fixed part pinched by the flexible tube 1 and the injection tool connection nozzle | cap | die 2, and it can be set as the more stable fixed state.
[0026]
【The invention's effect】
According to the present invention, since the base end portion of the cored bar wire is sandwiched between the flexible tube and the injection tool connecting base and fixed thereto, the base end part of the cored bar wire is connected. The assembly cost required for fixing can be greatly reduced, and an effective cost reduction can be achieved.
[Brief description of the drawings]
FIG. 1 is a side view of an endoscope catheter according to a first embodiment of the present invention.
FIG. 2 is a side sectional view of a cored wire fixing part according to the first embodiment of the present invention.
3 is a cross-sectional view taken along the line III-III in FIG. 2 of the first embodiment of the present invention.
FIG. 4 is a side sectional view of a cored bar wire fixing portion according to a second embodiment of the present invention.
FIG. 5 is a cross-sectional view taken along the line VV in FIG. 4 of the second embodiment of the present invention.
FIG. 6 is a side sectional view of a cored wire fixing part according to a third embodiment of the present invention.
7 is a cross-sectional view taken along the line VII-VII in FIG. 6 of the third embodiment of the present invention.
FIG. 8 is a side cross-sectional view of a cored wire fixing part according to a fourth embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Flexible tube 2 Injection tool connection cap 3 Core metal wire 11 Guide groove 21 Cylindrical part 22 Removable peripheral projection 26 Second cylindrical part 27 Guide groove 28 Wire base end retaining hole

Claims (5)

A flexible tube, an injection tool connection cap connected in a state in which one end side is inserted into a proximal end portion of the flexible tube in order to inject liquid into the flexible tube, and the flexible tube In an endoscope catheter having a cored wire for reinforcing the strength of the waist of
The cored wire is formed in a shape bent near the proximal end, and a wire proximal end retaining hole is formed in the outer peripheral surface of the injection tool connecting base inserted into the flexible tube,
Folded portion of the proximal end of the core metal wire is inserted into the locking hole exit end the wire group, the portion between the vicinity of the proximal end of the core metal wire and the flexible tube and the injection device connection mouth ring the scissors write rare,
An endoscopic catheter , wherein the cored bar wire is pressed from the outside by the flexible tube at a position where the cored wire is inserted into the wire proximal end retaining hole . The endoscope catheter according to claim 1, wherein an end portion of the injection tool connection base is press-fitted into a proximal end portion of the flexible tube. The endoscope catheter according to claim 2, wherein a protrusion that bites into the inner surface of the flexible tube and is prevented from coming off in the axial direction is formed in the press-fitted portion of the injection tool connection base. The wire base end positioning portion for positioning the base end portion of the cored wire is formed in one or both of the flexible tube and the injection tool connection base. Endoscopic catheter. The endoscope catheter according to claim 1, 2, 3, or 4 , wherein the cored wire is formed in a shape bent substantially at a right angle in the vicinity of the proximal end .

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