JP2002221671A - Medical treatment instrument raising device for endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a medical treatment instrument raising device for an endoscope which is capable of preventing a burn of a surgeon by a structure of high practicability when using a high-frequency treatment instrument. SOLUTION: An electrical insulating member 51b is interposed in a coupling between a raising piece driving mechanism 50 and a control wire 22 to electrically insulate the raising piece driving mechanism 50 and the control wire 22 from each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a treatment instrument raising device for an endoscope for changing the direction in which treatment tools project from the distal end of an insertion portion.

[0002]

2. Description of the Related Art In a side view type endoscope, a treatment instrument raising piece for changing a projecting direction of a distal end portion of a treatment instrument inserted into a treatment instrument insertion channel is generally arranged at a distal end of an insertion portion. Have been.

[0003] An elevating piece drive mechanism for operating the treatment instrument elevating piece is disposed on the operation section on the hand side, and the elevating piece driving mechanism and the treatment instrument elevating piece are operated by an operation wire inserted through the insertion section. The upper piece is connected.

In such an endoscope, when a treatment instrument through which a high-frequency current flows is used, the high-frequency current leaked to the treatment instrument raising piece is transmitted to an operation section via an operation wire.
When the surgeon touches a metal raising piece operating member or the like disposed on the operating section, there is a risk of burns.

Therefore, conventionally, the surface of the treatment instrument raising piece disposed at the distal end of the insertion portion, the surface of the portion that comes into contact with the treatment tool raising piece, and the like are formed of an electric insulating material (see Japanese Utility Model Application Laid-Open No. 57-157). −
No. 60601, Japanese Utility Model Application Laid-Open No. 62-90602).

[0006]

However, such a structure in which the surface of the treatment instrument raising piece or the surface of the portion in contact with the treatment tool raising piece is formed of an electrically insulating material has insufficient mechanical strength. It was not practical because it was easy to be damaged and the processing of parts became complicated.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a treatment tool raising device for an endoscope which can prevent a surgeon from using a high-frequency treatment tool with a highly practical structure. .

[0008]

Means for Solving the Problems In order to achieve the above object, a treatment instrument raising device for an endoscope according to the present invention is provided for changing a projecting direction of a distal end portion of a treatment instrument inserted into a treatment instrument insertion channel. The treatment instrument raising piece is disposed at the distal end of the insertion section, and the operation section connected to the base end of the insertion section is provided with a raising piece drive mechanism for operating the treatment instrument raising piece. In a treatment tool raising device of an endoscope in which a raising piece driving mechanism and a treatment tool raising piece are connected by an operation wire inserted and disposed in the section, an electric connection is provided to a connecting portion between the raising piece driving mechanism and the operation wire. The lifting member drive mechanism and the operation wire are electrically insulated with an insulating member interposed therebetween.

In the raising piece driving mechanism, if the member directly connected to the operation wire is made of metal and the member connected to the member is an electrically insulating member, the connection with the operation wire can be made by soldering or the like. Can be performed easily and reliably.

[0010]

Embodiments of the present invention will be described with reference to the drawings. FIG. 2 shows a side-viewing type endoscope. Near the distal end of the insertion section 1 covered with a flexible tube, a remote operation from an operation section 3 connected to the base end of the insertion section 1 is performed. A curved portion 4 that is arbitrarily bent is formed. Reference numeral 6 denotes a bending operation knob arranged on the operation unit 3.

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 inside of the insertion section 1 to the inside of the bending section 4. The proximal end of the treatment tool insertion channel 2 is connected to a treatment tool insertion port 7 protruding near the connection between the and the operation unit 3. The distal end of the treatment instrument insertion channel 2 is located at the distal end portion 1 a of the insertion section 1.

Various kinds of treatment tools 100 are inserted into the treatment tool insertion channel 2. Here, a so-called high-frequency treatment tool for performing treatment through a high-frequency current is inserted as the treatment tool 100.

The distal end portion 100a of the treatment instrument 100 projects laterally from the distal end 1a of the insertion portion, and a treatment instrument raising piece 5 for changing the projection direction is built into the distal end 1a of the insertion portion.

The treatment instrument raising piece 5 is a known one formed of, for example, stainless steel and arranged so as to be swingable about a support shaft. The operation wire 22 is inserted through the entire length of the insertion portion 1 and arranged. It is connected to the tip of.

The operating section 3 has a raising piece operating knob 8 and a raising part which operates to pivotally move the base end portion of the operating wire 22 in the axial direction by rotating the raising piece operating knob 8. The one-side drive mechanism 50 is disposed, and the operation wire 2
The protruding direction of the distal end portion 100a of the treatment instrument 100 can be arbitrarily adjusted by remotely swinging the treatment instrument raising piece 5 through the second instrument 2.

FIG. 1 is a side view partially showing 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 operated by the bending operation knob 6 to move the bending operation wire forward and backward. A raising piece driving mechanism 50 that is operated by the raising piece operation knob 8 is arranged along the bending drive mechanism.

Reference numeral 36 denotes a base end portion of a guide coil for guiding the operation wire 22 in the insertion portion 1 over the entire length thereof, and the distal end thereof is fixed to the insertion portion distal end 1a. 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.

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 3a of the operation unit 3. .

Reference numeral 53 denotes a guide cylinder formed of an electrically insulating hard plastic pipe material, and is fixed to the frame 3a of the operation unit 3 by screws. Guide tube 53
Inside, a rod-shaped wire drive rod 51 as a whole is inserted and arranged so as to be able to advance and retreat in the axial direction.

The wire drive rod 51 is connected to the operation wire 22
A metal distal end portion 51a connected and fixed to the base end of the base member by soldering or the like;
6 and a metal base metal portion 51c, which is screwed and connected, is disposed with an intermediate insulating portion 51b made of an electrically insulating hard plastic material or the like interposed therebetween, and they are integrally formed by, for example, an adhesive or the like. It is configured to be joined and connected. 52
Is an O-ring mounted to generate sliding resistance with the guide cylinder 53.

The intermediate insulating portion 51b is provided with a tip side metal portion 51a.
And the base metal part 51c is formed to have a sufficient length to ensure electrical insulation between the base metal part 51c and the high-frequency current flowing through the metal part 51a.
It has become less than.

A connecting tube 56 is screw-connected to the proximal end of the wire driving rod 51 (that is, the proximal end of the proximal metal portion 51c). The linked link 58 is arranged to be driven by the raising piece operation knob 8.

With such a structure, the raising piece operation knob 8
Is operated, the operation wire 22 advances and retreats in the guide coil 36 via the raising piece driving mechanism 50, and the treatment tool raising piece 5 arranged at the insertion portion distal end 1a swings, and the distal end of the treatment tool 100 The projecting direction of the portion 100a can be changed.

Since the operating wire 22 is electrically insulated from the raising piece driving mechanism 50 and the raising piece operating knob 8 disposed on the operating section 3, the high-frequency treatment tool is used as the treatment tool 100. Is used, there is no danger of the operator having the operation unit 3 being burned even when a high-frequency current leaks to the treatment instrument raising piece 5.

[0025]

According to the present invention, an electrically insulating member is interposed at a connection portion between the raising piece driving mechanism and the operation wire to electrically insulate the raising piece driving mechanism and the operation wire. Therefore, even when the high-frequency treatment instrument is used and the high-frequency current leaks to the treatment instrument elevating piece at the tip, the high-frequency current is not transmitted to the elevating piece driving mechanism. There is no risk of burns.

Since there is no need to perform electrical insulation treatment on the distal end of the treatment instrument raising piece or the operation wire in the insertion portion, there is no problem in terms of strength or assembly and high practicality is obtained.

[Brief description of the drawings]

FIG. 1 is a partial side sectional 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 entire configuration of the endoscope according to the embodiment of the present invention.

FIG. 3 is a front partial cross-sectional view of an internal structure of an operation unit of the endoscope according to the embodiment of the present invention.

[Explanation of symbols]

 2 treatment instrument insertion channel 3 operating section 5 treatment instrument raising piece 8 raising piece operation knob 22 operating wire 50 raising piece driving mechanism 51 wire drive rod 51a distal end metal section 51b intermediate insulating section (electric insulating member) 51c base end Side metal part

Claims (2)

[Claims] 1. A treatment instrument raising piece for changing a projecting direction of a distal end portion of a treatment instrument inserted through a treatment instrument insertion channel is arranged at a distal end of an insertion portion and connected to a base end of the insertion portion. An operation piece driving mechanism for operating the treatment instrument raising piece is arranged in the operating section, and the operation piece driving mechanism and the treatment tool raising piece are operated by an operation wire inserted and arranged in the insertion section. Is connected to the endoscope treatment instrument raising device, wherein an electrical insulating member is interposed at a connection portion between the raising piece driving mechanism and the operation wire, and the connection between the raising piece driving mechanism and the operation wire A treatment instrument raising device for an endoscope, wherein electrical insulation is provided between the treatment devices. 2. The endoscope according to claim 1, wherein the member directly connected to the operation wire is made of metal, and the member connected to the member is the electrical insulating member. Treatment instrument raising device.