JP4753261B2 - Operation part of high-frequency treatment instrument for endoscope - Google Patents

Description

  The present invention relates to an operation unit of a high-frequency treatment instrument for an endoscope.

In general, the operation portion of the endoscope high-frequency treatment instrument is provided with a slider for moving the operation wire forward and backward and a power cord connecting terminal for connecting a high-frequency power cord for passing a high-frequency current through the operation wire. .
Such power cord connection terminals are often provided sideways on the slider, but when the operation unit is rotated to change the direction of the distal end of the treatment instrument, the high frequency power cord is connected to the operation unit. It may get tangled around and interfere with the sliding operation of the slider.

Therefore, in the invention described in Patent Document 1, the power cord connection terminal is arranged on the slider with the rearward direction. If it does in that way, since it will be in the state where the high frequency power supply cord extends straight back from the slider, even if the operation portion is rotated, the high frequency power supply cord is not entangled with the operation portion.
JP 2004-188013 A

  Certainly, by configuring as in the invention described in Patent Document 1, it is possible to prevent a phenomenon in which the high-frequency power cord is entangled with the operation unit. However, when the operation unit is rotated, the high-frequency power cord itself is twisted, causing a meandering or bending phenomenon, and the operability is reduced due to the rotational force of the high-frequency power cord becoming a dumpling or returning torsion. There is a case. In addition, since the high-frequency power cord extends from the operator's hand toward the chest, it may be cumbersome and reduce operability.

  The present invention was made to solve such a problem, when the operation unit is rotated, the high-frequency power cord does not entangle with the operation unit, and the high-frequency power cord itself does not twist, As a result, it aims at providing the operation part of the high frequency treatment tool for endoscopes which can obtain the outstanding operativity.

Endoscope connected to the proximal end side of the sheath to move the conductive operation wire loosely passed through the sheath sheath inserted into and removed from the treatment instrument guide tube of the endoscope in the axial direction from the proximal side. An operation unit for a high-frequency treatment instrument for a mirror, the operation unit having a cylindrical portion in which a base end of an outer sheath is connected to a distal end portion and a slit is formed in an axial direction, and an operation wire is inserted in the axial direction comprising a body, Rutotomoni is connected to the proximal end of the operating wire to advance and retreat operation of the operation wire, and a slider which is attach slidably in the axial direction of the cylindrical portion to the operation wire operation portion main body, the slider to the cylindrical portion of the power cord connection terminal operating portion body for connecting the high-frequency power cord providing communication a high-frequency current with attached toward the rotatable and laterally about the axis in operation wire, the operation word Is conducting seat arranged in the slit is fixed so that projects slightly from the outer diameter yer a cylindrical portion of the electrically conductive by the operation unit main body, the power cord regardless of the rotational position of the power cord connection terminal against the slider An annular conductive spring member for electrically connecting the connection terminal and the conductive seat has a protruding portion of the conductive seat and a columnar portion of the operation unit main body in a region between the power cord connection terminal and the conductive seat. It is arranged so as to be always elastically deformed by surrounding and to be restricted from moving in the axial direction with respect to the conductive seat .

  The conductive spring member may be formed in a C-ring-shaped cross-sectional shape, directly connected to the power cord connecting terminal, and spread and elastically deformed on the outer peripheral surface of the conductive seat. In addition, the conductive spring member may be formed in a coil spring shape, fixedly connected to the power cord connection terminal, and may be elastically deformed by being spread on the outer peripheral surface of the conductive seat. May be formed in a cylindrical shape having a corrugated surface, and may be arranged in a state where it is elastically crushed between the annular terminal seat to which the power cord connecting terminals are connected and the outer peripheral surface of the conductive seat.

According to the operation section of the endoscope high-frequency treatment instrument of the present invention, the conductive seat that is electrically connected to the operation wire is fixedly disposed on the slider, and the power cord connecting terminal is a cylindrical portion of the operation section main body. the mounted on rotatable slider about the axis, the annular conductive spring member for electrically connecting the power cord connection terminal and the conductive seat regardless of the rotational position of the power cord connection terminal for slider, power cord In a region between the connection terminal and the conductive seat, the protruding portion of the conductive seat and the cylindrical portion of the operation unit main body are surrounded so as to be elastically deformed at all times and arranged so as to be restricted from moving in the axial direction with respect to the conductive seat. Therefore, when the operation unit is rotated, electrical continuity between the power cord connection terminal and the operation wire is always ensured, and the high frequency power cord is entangled with the operation unit. Not, and twisting or the like of the high-frequency power supply cord itself does not occur, as a result, it is possible to obtain excellent operability.

Embodiments of the present invention will be specifically described below with reference to the drawings.
FIG. 2 shows the overall configuration of the operation section of the endoscope high-frequency treatment instrument. A proximal end of an outer sheath 2 that is inserted into and removed from a treatment instrument guide tube of an endoscope (not shown) is connected to the distal end of the operation unit main body 1 that is formed in an elongated cylindrical shape with an electrically insulating hard plastic material. ing. The outer sheath 2 is formed of, for example, a flexible fluororesin tube. A conductive operation wire 3 is loosely passed through the outer sheath 2 and connected to a high-frequency electrode (not shown) disposed at the distal end of the outer sheath 2. The high-frequency electrode may be, for example, a knife shape, a loop shape, a forceps shape, or the like, and the high-frequency electrode is moved forward and backward from the proximal side in the longitudinal direction, whereby the high-frequency electrode is moved to the distal end of the outer sheath 2. Go in and out and open and close.

  A first finger hook ring 4 for engaging the first finger is formed integrally with the operation unit wooden body 1 at the rear end of the operation unit main body 1. A slider 5 slidable in the longitudinal direction of the operation unit main body 1 (that is, the axial direction of the proximal end portion of the operation wire 3) is attached to the operation unit main body 1 and engages the second and third fingers. Second and third finger ring 6 </ b> A, 6 </ b> B are formed integrally with the slider 5.

  7 is a slit formed in the operation unit main body 1, and the proximal end portion of the operation wire 3 drawn out from the proximal end of the outer sheath 2 passes through the slit 7 to reach the inner portion of the slider 5, It is fixed to the slider 5 with a screw 8. Therefore, when the slider 5 is slid along the operation portion main body 1 in the axial direction of the operation wire 3, the operation wire 3 moves forward and backward in the outer sheath 2 in the axial direction. The base end portion of the operation wire 3 located in the slit 7 is covered with a reinforcing metal pipe. Reference numeral 9 denotes a power cord connecting terminal disposed sideways on the slider 5 for connecting a high frequency power cord 10 for passing a high frequency current to the operating wire 3. The power cord connecting terminal 9 passes through the operating wire 3. Thus, a high-frequency current can be supplied to the high-frequency electrode at the tip.

FIG. 1 is a side sectional view of a portion where the slider 5 is engaged with the operation unit main body 1. FIGS. 3, 4, and 5 are respectively a line AA, a line BB, and a line C in FIG. It is sectional drawing of the cross section cut | disconnected by the -C line | wire.
As shown in FIG. 3, the slit 7 is formed so as to divide the operation unit main body 1 in the radial direction, and the slider 5 loosely surrounds the entire outer periphery of the operation unit main body 1. Then, as shown in FIGS. 1 and 4, a conductive plate 11 made of conductive metal and having a shape that fits almost tightly in the slit 7 is fixed to the slider 5 with a fixing screw 12. Yes. Accordingly, the slider 5 cannot rotate around the axis of the operation unit main body 1 and can only slide in the axial direction. 13 is a washer. At the central axis position of the conductive seat 11 that coincides with the base end position of the operation wire 3, a wire through hole 15 through which the base end portion of the operation wire 3 is passed is formed in the front-rear direction. The proximal end portion of the operation wire 3 passed through the wire through hole 15 is pressed and fixed to the conductive seat 11 at the tip of the wire set screw 8 so that the operation wire 3 and the conductive seat 11 are electrically connected.

FIG. 6 is a partially exploded view of the conductive seat 11 and the power cord connecting terminal 9 and the like, and the root portion of the power cord connecting terminal 9 formed in a rod shape is an annular terminal made of a conductive metal having a spring property. Directly connected and fixed to the outer peripheral surface of the seat 17 by welding or the like, the power cord connection terminal 9 is in a state of projecting outward from the terminal seat 17 vertically. The terminal seat 17 is formed with an inner diameter dimension that fits tightly to the outer surface of the conductive seat 11 . The terminal seat 17 is divided by the slit 18 over the entire length, and is formed in a C-ring-like cross-sectional shape in a cross section perpendicular to the axial direction. Therefore, in this embodiment, the terminal seat 17 is an “annular conductive spring member”. The terminal seat 17 thus formed is set so as to surround the intermediate portion of the conductive seat 11, but the outer edge of the stopper projection 19 formed outwardly projecting from the front end portion of the conductive seat 11 is closer. It protrudes outside the inner diameter of the terminal seat 17. Accordingly, since the terminal seat 17 cannot pass through the stopper protrusion 19, when the terminal seat 17 is attached in a state of surrounding the conductive seat 11, the terminal seat 17 is elastically deformed into a slightly expanded state.

  As a result, in the state where the terminal seat 17 is attached to the conductive seat 11 as shown in FIGS. 1 and 5, the terminal seat 17 is restricted from moving in the axial direction by the stopper projections 19. It can rotate freely in the direction around the axis without detachment. Further, as shown in FIG. 5, the outer surface of the conductive seat 11 protrudes slightly outward from the outer surface of the operation unit body 1 at the inner position of the terminal seat 17, and the terminal seat 17 is slightly lifted by the conductive seat 11. It is always elastically deformed so that it can be spread. Therefore, since the terminal seat 17 and the conductive seat 11 are always in contact regardless of the rotational position of the terminal seat 17, the power cord connecting terminal 9 and the conductive seat 11 are always electrically connected via the terminal seat 17. ing. A terminal frame 20 is formed of an electrically insulating plastic material so as to surround the terminal seat 17 and to surround the power cord connecting terminal 9. The terminal frame 20 is formed with a slit 21 through which the power cord connecting terminal 9 is passed during assembly, and the power cord connecting terminal 9 is engaged with the slit 21 so that the terminal frame 20 is connected to the power cord connecting terminal. 9 (and the terminal seat 17) are integrally rotated around the operation unit main body 1.

  As shown in FIG. 7, the operation unit of the endoscope high-frequency treatment instrument according to the embodiment configured as described above operates the operation wire 3 by sliding the slider 5 in the axial direction of the operation unit main body 1. The high-frequency electrode (not shown) can be operated at the tip of the sheath 2 by advancing and retracting the sheath 2 in the sheath 2. Further, as shown in FIG. 8, when the operation unit is rotated in the direction around the axis of the operation unit main body 1 (that is, the direction around the slide direction of the slider 5), the part other than the terminal frame 20 and the power cord connection terminal 9. Are rotated together, and the outer sheath 2 and the operation wire 3 are rotated following the rotation to arbitrarily change the direction of the high-frequency electrode. The portion of the terminal frame 20 and the power cord connecting terminal 9 to which the high-frequency power cord 10 is connected is rotatable with respect to the operation section main body 1 and maintains the original orientation. At that time, electrical conduction between the power cord connecting terminal 9 and the operation wire 3 is always ensured by the conductive spring member (terminal seat 17), and the high frequency power source connected to the power cord connecting terminal 9 is used. The cord 10 is not entangled with the operation unit, and the high-frequency power cord 10 itself is not twisted at all.

  FIG. 9 shows the operation part of the high-frequency treatment instrument for endoscope according to the second embodiment of the present invention. As shown in FIG. 10, the root part of the power cord connection terminal 9 is shown. The connected and fixed terminal seat 17 is formed in a simple cylindrical shape that is loosely fitted to the conductive seat 11, and a coil spring 23 made of a conductive material having one end connected and fixed to the terminal seat 17 by welding or the like. It is always expanded by the outer peripheral surface of the conductive seat 11 and elastically deformed. Therefore, in this embodiment, the coil spring 23 is an “annular conductive spring member”, and the same effect as that of the first embodiment can be obtained.

  FIG. 11 shows an operation portion of the endoscope high-frequency treatment instrument according to the third embodiment of the present invention, and is a cross-sectional view corresponding to FIG. 5 of the first embodiment. In this embodiment, instead of the coil spring 23 of the second embodiment, a wave ring 24 formed in a cylindrical shape having a wave surface is provided as an “annular conductive spring member”, and the wave ring 24 is Similar to the second embodiment, it is disposed between the inner peripheral portion of the terminal seat 17 and the outer peripheral surface of the conductive seat 11. The wavy ring 24 is in sliding contact with the inner peripheral surface of the annular terminal seat 17 and does not move with respect to the conductive seat 11 (the wavy ring 24 may be fixed to the conductive seat 11). Even if comprised in this way, the effect similar to 1st Embodiment can be acquired.

The partial side sectional view of the operation part of the high frequency treatment tool for endoscopes of the 1st embodiment of the present invention. The perspective view of the operation part of the high frequency treatment tool for endoscopes of the 1st Embodiment of this invention. Sectional drawing of the cross section cut | disconnected by the AA line in FIG. 1 of the operation part of the high frequency treatment tool for endoscopes of the 1st Embodiment of this invention. Sectional drawing of the cross section cut | disconnected by the BB line in FIG. 1 of the operation part of the high frequency treatment tool for endoscopes of the 1st Embodiment of this invention. Sectional drawing of the cross section cut | disconnected by CC line in FIG. 1 of the operation part of the high frequency treatment tool for endoscopes of the 1st Embodiment of this invention. The partial exploded perspective view of the operation part of the high frequency treatment tool for endoscopes of the 1st Embodiment of this invention. The perspective view of the slide operation state of the operation part of the high frequency treatment tool for endoscopes of the 1st Embodiment of this invention. The perspective view of the rotation operation state of the operation part of the high frequency treatment tool for endoscopes of the 1st Embodiment of this invention. The fragmentary sectional side view of the operation part of the high frequency treatment tool for endoscopes of the 2nd Embodiment of this invention. The partial exploded perspective view of the operation part of the high frequency treatment tool for endoscopes of the 2nd Embodiment of this invention. Sectional drawing of the operation part of the high frequency treatment tool for endoscopes of the 3rd Embodiment of this invention (sectional drawing corresponded in FIG. 5 of 1st Embodiment).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Operation part main body 2 ... Exterior sheath 3 ... Operation wire 5 ... Slider 9 ... Power supply cord connection terminal 10 ... High frequency power supply cord 11 ... Conductive seat 17 ... Terminal seat 18 ... Slit 20 ... Terminal frame 23 ... Coil spring 24 ... Wavy ring

Claims (4)

An inner wire connected to the proximal end side of the outer sheath in order to move the conductive operation wire loosely passed through the outer sheath inserted into and removed from the treatment instrument guide tube of the endoscope in the axial direction from the proximal side. An operation unit of a high-frequency treatment instrument for endoscope,
An operation portion main body having a cylindrical portion in which a base end of the outer sheath is connected to a distal end portion and a slit is formed in the axial direction, and the operation wire is inserted in the axial direction ;
An the operation is coupled to the proximal end of the wire Rutotomoni, sliders that are attach axially slidably in said operating wire to said cylindrical portion of the operation portion main body in order to advance and retreat operation of said operating wire ,
A power cord connecting terminal for connecting a high frequency power cord for passing a high frequency current through the operation wire is attached to the slider so that the columnar portion of the operation portion main body is rotatable about an axis and directed sideways. The conductive seat disposed in the slit is fixed so as to be electrically connected to the operation wire and slightly protrude from the outer diameter of the columnar portion of the operation portion main body,
An annular conductive spring member for electrically connecting the power cord connection terminal and the conductive seat regardless of the rotational position of the power cord connection terminal with respect to the slider includes the power cord connection terminal and the conductive seat. In a region between the two, the protruding portion of the conductive seat and the columnar portion of the operation section main body are arranged so as to be elastically deformed at all times and to be restricted from moving in the axial direction with respect to the conductive seat . An operating portion of an endoscopic high-frequency treatment instrument.   The operation portion of the endoscope high-frequency treatment instrument according to claim 1, wherein the conductive spring member is formed in a C-ring-shaped cross-sectional shape, and is directly connected to the power cord connection terminal. An operation portion of the endoscope high-frequency treatment instrument that is elastically deformed by being spread on the outer peripheral surface.   The operation portion of the endoscope high-frequency treatment instrument according to claim 1, wherein the conductive spring member is formed in a coil spring shape and is fixedly connected to the power cord connection terminal, and the conductive seat. The operation part of the high-frequency treatment instrument for endoscopes which is pushed and spread on the outer peripheral surface of the endoscope and is elastically deformed. The operation part of the high frequency treatment instrument for endoscope according to claim 1, wherein the conductive spring member is formed in a cylindrical shape having a corrugated surface, and the annular terminal seat to which the power cord connection terminal is connected. And an operation portion of the endoscope high-frequency treatment instrument arranged in a state of being elastically crushed between the conductive seat and the outer peripheral surface of the conductive seat.

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