JP3803257B2 - Endoscope treatment tool raising device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an endoscope treatment instrument raising apparatus for changing the protruding direction of treatment instruments protruding from a distal end of an insertion portion.
[0002]
[Prior art]
In a side-viewing endoscope or the like, generally, a treatment instrument raising piece for changing the protruding direction of the distal end portion of the treatment instrument inserted through the treatment instrument insertion channel is disposed at the distal end of the insertion portion.
[0003]
And the raising piece drive mechanism for operating the treatment instrument raising piece is arranged in the operation part on the hand side, and the raising piece drive mechanism and the treatment instrument raising piece are operated by the operation wire inserted and arranged in the insertion part. Are connected.
[0004]
In such an endoscope, when a treatment instrument that allows high-frequency current to flow is used, the high-frequency current leaked to the treatment tool raising piece is transmitted to the operation unit via the operation wire, and the operator is placed in the operation unit. Otherwise, there is a risk of burns when touching a metal raising piece operating member or the like.
[0005]
Therefore, conventionally, the surface of the treatment instrument raising piece arranged at the distal end of the insertion portion, the surface of the portion in contact with the treatment instrument raising piece, and the like have been formed of an electrical insulating material (Japanese Utility Model Publication No. 57-60601). No. 62-90602).
[0006]
[Problems to be solved by the invention]
However, such a structure in which the surface of the treatment tool raising piece or the surface of the part that comes into contact with the treatment tool raising piece is made of an electrical insulating material is insufficient in mechanical strength and is easily damaged, or part processing It was not practical because it became complicated.
[0007]
Therefore, an object of the present invention is to provide an endoscope treatment tool raising apparatus capable of achieving a burn prevention of an operator when using a high-frequency treatment tool with a highly practical structure.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the treatment instrument raising device for an endoscope of the present invention has a treatment instrument raising piece for changing the protruding direction of the distal end portion of the treatment instrument inserted into the treatment instrument insertion channel. The operating portion connected to the proximal end of the insertion portion is provided with a raising piece drive mechanism for operating the treatment instrument raising piece, and an operation wire inserted through the insertion portion is used. In a treatment instrument raising apparatus for an endoscope in which a raising piece drive mechanism and a treatment instrument raising piece are connected to each other, an electrical insulating member is interposed at a connecting portion between the raising piece drive mechanism and an operation wire. The one drive mechanism and the operation wire are electrically insulated.
[0009]
In the raising piece drive mechanism, if the member directly connected to the operation wire is made of metal and the member connected to the operation wire is an electrically insulating member, the connection to the operation wire can be easily performed by soldering or the like. It can be done reliably.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
FIG. 2 shows a side-view type endoscope, in the vicinity of the distal end of the insertion section 1 covered with a flexible tube, by remote operation from the operation section 3 connected to the proximal end of the insertion section 1. A curved portion 4 that is arbitrarily bent is formed. Reference numeral 6 denotes a bending operation knob disposed in the operation unit 3.
[0011]
A treatment instrument insertion channel 2 made of an electrically insulating tube material such as a tetrafluoroethylene resin tube is inserted through the entire length from the insertion portion 1 into the bending portion 4. The proximal end of the treatment instrument insertion channel 2 is connected to the treatment instrument insertion port 7 projecting in the vicinity of the connecting portion with the treatment instrument 3. The distal end of the treatment instrument insertion channel 2 is located at the distal end portion 1 a of the insertion portion 1.
[0012]
Various treatment tools 100 are inserted into the treatment tool insertion channel 2, and here, as the treatment tool 100, a so-called high-frequency treatment tool for performing treatment through a high-frequency current is inserted.
[0013]
The distal end portion 100a of the treatment instrument 100 protrudes laterally from the insertion portion distal end 1a, but a treatment instrument raising piece 5 for changing the protruding direction is built in the insertion portion distal end 1a.
[0014]
The treatment instrument raising piece 5 is a known one that is formed of, for example, stainless steel and is swingably disposed around a support shaft, and is attached to the distal end of an operation wire 22 that is inserted through the entire length of the insertion portion 1. It is connected.
[0015]
The operation unit 3 includes a raising piece operation knob 8 and a raising piece drive mechanism that operates to drive the proximal end portion of the operation wire 22 forward and backward in the axial direction by rotating the raising piece operation knob 8. 50 is disposed, and the treatment instrument raising piece 5 can be remotely operated to swing through the operation wire 22 to arbitrarily adjust the protruding direction of the distal end portion 100a of the treatment instrument 100.
[0016]
FIG. 1 is a side view showing a part of the internal structure of the operation unit 3 in cross section, and FIG. 3 is a front view thereof. 6a is a bending drive mechanism that is actuated by the bending operation knob 6 in order to advance and retract the bending operation wire, and a raising piece driving mechanism 50 that is actuated by the raising piece operation knob 8 is arranged along the bending drive mechanism.
[0017]
Reference numeral 36 denotes a proximal end portion of a guide coil that guides the operation wire 22 over the entire length in the insertion portion 1, and a distal end thereof is fixed to the insertion portion distal end 1 a. Inside the guide coil 36, an electrically insulating tube 37 is inserted over the entire length, and is electrically insulated from the operation wire 22.
[0018]
A metal stopper 54 is fixed to the base end 36 of the guide coil by soldering or the like, and the stopper 54 is locked to a support member 55 fixed to the frame 3 a of the operation unit 3.
[0019]
Reference numeral 53 denotes a guide cylinder formed of an electrically insulating hard plastic pipe material, which is fixed to the frame 3a of the operation unit 3 with screws. In the guide tube 53, a rod-shaped wire drive rod 51 as a whole is fitted and disposed so as to be movable back and forth in the axial direction.
[0020]
The wire drive rod 51 includes a metal distal end side metal portion 51a that is connected and fixed to the base end of the operation wire 22 by soldering or the like, and a metal base that is screwed to a connection pipe 56 described later on the base end side. The end-side metal part 51c is arranged with an intermediate insulating part 51b made of an electrically insulating hard plastic material or the like interposed therebetween, and these are integrally joined and connected by, for example, an adhesive. Reference numeral 52 denotes an O-ring mounted to generate sliding resistance with the guide cylinder 53.
[0021]
The intermediate insulating portion 51b is formed to have a length that ensures sufficient electrical insulation between the distal end side metal portion 51a and the proximal end side metal portion 51c, and a high frequency current is communicated to the distal end side metal portion 51a. However, the influence does not reach the base end side metal part 51c.
[0022]
A connecting tube 56 is screwed to the proximal end side of the wire drive rod 51 (that is, the proximal end side of the proximal end side metal portion 51c), and is further rotatably connected to the tip of the wire driving rod 51 via a pin 57. The link 58 is arranged to be driven by the raising piece operation knob 8.
[0023]
With such a structure, when the raising piece operation knob 8 is operated, the operation wire 22 advances and retreats in the guide coil 36 via the raising piece drive mechanism 50, and the treatment tool raising piece disposed at the distal end 1a of the insertion portion. 5 can swing, and the protruding direction of the distal end portion 100a of the treatment instrument 100 can be changed.
[0024]
Since the operation wire 22 is electrically insulated from the raising piece drive mechanism 50 and the raising piece operation knob 8 disposed in the operation unit 3, a high-frequency treatment instrument is used as the treatment instrument 100. Even when a high-frequency current leaks to the treatment instrument raising piece 5, there is no possibility that the operator having the operation unit 3 will be burned.
[0025]
【The invention's effect】
According to the present invention, the electrical insulation member is interposed in the connecting portion between the raising piece drive mechanism and the operation wire, and the insulation between the raising piece drive mechanism and the operation wire is electrically insulated. Even if high-frequency current leaks to the treatment tool raising piece at the tip, high-frequency current is not transmitted to the raising piece drive mechanism, so there is a risk that the surgeon operating with the operation unit may be burned There is no.
[0026]
And since it is not necessary to perform an electrical insulation treatment to the treatment tool raising piece at the tip, the operation wire in the insertion portion, etc., there is no problem in terms of strength and assembly, and it has high practicality.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional side view of an internal structure of an operation unit of an endoscope according to an embodiment of the present invention.
FIG. 2 is an external view showing an overall configuration of an endoscope according to an embodiment of the present invention.
FIG. 3 is a partial front sectional view of the internal structure of the operation unit of the endoscope according to the embodiment of the present invention.
[Explanation of symbols]
2 treatment tool insertion channel 3 operation part 5 treatment tool raising piece 8 raising piece operation knob 22 operation wire 50 raising piece drive mechanism 51 wire drive rod 51a distal end side metal part 51b intermediate insulation part (electrical insulation member)
51c Base end side metal part

Claims (2)

A treatment instrument raising piece for changing the protruding direction of the distal end portion of the treatment instrument inserted into the treatment instrument insertion channel is disposed at the distal end of the insertion section, and the operation section connected to the proximal end of the insertion section The raising piece drive mechanism for operating the treatment instrument raising piece is disposed, and the raising piece driving mechanism and the treatment instrument raising piece are connected by an operation wire inserted and disposed in the insertion portion. In the endoscope treatment instrument raising device,
A rod-shaped wire drive rod as a whole is fitted and disposed in a guide cylinder made of an electrical insulating material fixed to a frame in the operation portion so as to be movable back and forth in the axial direction, and the wire drive rod is a base of the operation wire. An intermediate insulating portion made of an electrically insulating member is formed of a metal distal end metal portion connected and fixed to the end, and a metal proximal end metal portion connected to the raising piece drive mechanism side member. The endoscope is configured to be integrally connected with being sandwiched therebetween , whereby the raising piece driving mechanism and the operation wire are connected in an electrically insulated state . Treatment tool raising device. A guide coil for guiding the operation wire over the entire length in the insertion portion is provided, and an electrically insulating tube is inserted in the guide coil over the entire length, whereby the guide coil and the operation wire are The endoscope treatment instrument raising apparatus according to claim 1, wherein a gap is electrically insulated .

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