JP4151920B2 - Endoscopic treatment tool - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an endoscope treatment instrument that is used by being inserted into and removed from an endoscope treatment instrument insertion channel.
[0002]
[Prior art]
FIG. 3 shows an example of a state in which the most common biopsy forceps 10 as an endoscope treatment tool is inserted into a treatment tool insertion channel of the endoscope 1 and used. 2a is an inlet of the treatment instrument insertion channel, and 2b is an outlet.
[0003]
The biopsy forceps 10 is inserted and disposed in a flexible sheath 11 made of a tightly wound coil pipe that is inserted into and removed from the treatment instrument insertion channel of the endoscope 1 so that the operation wire 12 made of a stranded wire can advance and retreat in the axial direction. The distal end cup 14 provided at the distal end portion of the flexible sheath 11 is opened and closed by moving the operation wire 12 forward and backward from the operation portion 13 connected to the proximal side of the flexible sheath 11. It has become.
[0004]
[Problems to be solved by the invention]
As shown in FIG. 3, the insertion portion 3 of the endoscope 1 bends along the shape of the organ in the patient's body, and the portion outside the body is often bent freely in the space. Along with this, the flexible sheath 11 inserted into the treatment instrument insertion channel also bends.
[0005]
In this way, when the tightly wound coil pipe used for the flexible sheath 11 is bent, there is a gap between the strands on the outer edge side of the curve, and the length of the axial direction is extended. However, even if the operation wire 12 inserted in the inside is bent, the length does not change.
[0006]
Therefore, in order to push and pull the operation wire 12 from the operation unit 13 to open and close the distal end cup 14 in both the winding state and the relatively straight state of the flexible sheath 11, the movement of the operation wire 12 The stroke needs to be very long.
[0007]
As a result, when the flexible sheath 11 is used in a relatively straight state, even if the distal end cup 14 is fully opened and the operation wire 12 is pushed to the maximum on the distal end side, At the hand side, the operation wire 12 can be pushed further, and the operation wire 12 is forcibly pushed into the flexible sheath 11.
[0008]
Then, as shown in FIG. 4, the distal end portion 12a of the operation wire 12 to which a large compressive force is applied swells and the twist is returned, whereby the rotational force around the axis generated in the operation wire 12 is transmitted to the distal end cup 14 side. This will cause malfunction. In addition, a similar bulge may occur in the vicinity 12b of the distal end of the operation wire 12.
[0009]
Therefore, the present invention is an endoscope treatment tool having a configuration in which an operation wire made of a stranded wire is inserted into a flexible sheath made of a tightly wound coil pipe, and prevents the operation wire from bulging near the tip. An object of the present invention is to provide an endoscopic treatment tool capable of maintaining operability.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, an endoscope treatment instrument according to the present invention is an operation wire comprising a stranded wire in a flexible sheath comprising a tightly wound coil pipe inserted into and removed from a treatment instrument insertion channel of an endoscope. Is inserted and arranged so as to be able to advance and retract in the axial direction, and the distal treatment member provided at the distal end portion of the flexible sheath is operated by operating the operation wire forward and backward from the proximal side of the flexible sheath. The endoscopic treatment tool is characterized in that a coating for increasing the swell resistance is applied to the vicinity of the distal end of the operation wire.
[0011]
The coating may be a metal film coating applied by plating or vapor deposition, and the coating may be a coating with a synthetic resin tube or a synthetic resin film applied with a coating treatment or an impregnation treatment. It may be a coating.
[0012]
And the said coating | cover may be given to the position 10-150 mm away from the front-end | tip of the said operation wire.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a distal end portion of an endoscopic biopsy forceps according to a first embodiment to which the present invention is applied. 11 is a flexible sheath made of a coil pipe formed by tightly winding a stainless steel wire with a constant diameter, for example, with a strand diameter of about 0.2 to 0.7 mm and a total length of about 50 cm to 300 cm. is there.
[0014]
In the flexible sheath 11, for example, an operation wire 12 made of a stranded wire formed by twisting 7 to 49 thin stainless steel wires is inserted through the entire length so as to advance and retract in the axial direction. Advancement / retraction operation is performed by an operation unit connected to the proximal side end of the sheath 11.
[0015]
A pair of tip cups 14 (tip treatment members) are pivotally supported by the support cylinder 15 attached to the tip of the operation wire 12 so that the tip cup 14 can be opened and closed. The tip of the operation wire 12 is connected and fixed by silver brazing or the like.
[0016]
Therefore, the distal end cup 14 can be opened and closed by operating the operation wire 12 forward and backward from the hand side, and the distal end cup 14 is opened and closed in either a winding state or a relatively straight state. The moving stroke of the operation wire 12 is ensured sufficiently long so that the operation wire 12 can be moved.
[0017]
A metal plating 12c is applied to the vicinity of the distal end of the operation wire 12 (for example, a range up to a position 10 to 150 mm away from the distal end). As the plating material, titanium, nickel, gold, platinum, or the like can be used, and metal deposition may be performed instead of the plating process. Moreover, after connecting the operation wire 12 to the link mechanism 16 (before passing through the flexible sheath 11), a plating process or a vapor deposition process may be performed collectively.
[0018]
With such a configuration, even when the flexible sheath 11 is used in a relatively straight state and the operation wire 12 is forcibly pushed into the flexible sheath 11 from the hand side, the operation wire 12 is used. Swelling of the tip portion of the wire is suppressed by the plating 12c, and malfunction due to return of the stranded wire does not occur.
[0019]
FIG. 2 shows a distal end portion of an endoscopic biopsy forceps according to a reference example of the present invention. Instead of the plating process of the first embodiment, for example, a fluororesin or the like is disposed on the distal end portion of the operation wire 12. A synthetic resin tube 12d such as polyethylene resin is coated.
[0021]
The present invention is not limited to the above embodiment. For example, the present invention is not limited to a biopsy forceps, and an operation wire made of a stranded wire is inserted into a flexible sheath made of a tightly wound coil pipe. The present invention can be applied to various endoscopic treatment tools having a configuration.
[0022]
【The invention's effect】
According to the present invention, the flexible sheath is used in a relatively straight state by providing a coating for increasing the bulging resistance strength of the operation wire in the vicinity of the distal end of the operation wire, so that the operation wire is at hand. Even if it is forced to be pushed into the flexible sheath from the side, the bulge of the tip of the operation wire is suppressed, and malfunctions due to return of the stranded wire do not occur, maintaining good operability can do.
[Brief description of the drawings]
FIG. 1 is a side cross-sectional view of a distal end portion of an endoscope treatment tool according to a first embodiment of the present invention.
FIG. 2 is a side cross-sectional view of a distal end portion of an endoscope treatment tool according to a second embodiment of the present invention.
FIG. 3 is a schematic view of an example of a state in which an endoscope treatment tool is used.
FIG. 4 is a side sectional view of a conventional endoscopic biopsy forceps.
[Explanation of symbols]
11 Flexible sheath 12 Operation wire 12c Plating 12d Synthetic resin tube 14 Tip cup (tip treatment member)

Claims (2)

An operation wire made of a metal stranded wire is inserted into a flexible sheath made of a tightly wound coil pipe that is inserted into and removed from a treatment instrument insertion channel of an endoscope so as to be able to advance and retreat in the axial direction. In the endoscopic treatment instrument that operates the distal treatment member provided at the distal end portion of the flexible sheath by advancing and retracting the operation wire from the proximal side of
A treatment instrument for an endoscope, wherein a metal film coating by plating or vapor deposition for increasing bulging resistance strength is applied to a portion near the tip of the operation wire. The coating is, the treatment instrument for endoscope according to claim 1 Symbol placement has been subjected to a position away 10~150mm from the tip of the operating wire.

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