JP2000197644A - High frequency treating implement for endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high frequency treating implement for an endoscope which is safety by preventing an operator from getting burned due to contact with a rod arranged projecting from the base end of a sheath is spite of being used connected to an operation part the electrical safety of which is not considered sufficiently. SOLUTION: In the high frequency treating implement for the endoscope, a high frequency electrode is disposed at the tip of an electrically insulated sheath 1 to be put in or out from the treating implement insertion channel of an endoscope, the electrically conductive rod 7 connected to the high frequency electrode is disposed projecting from the base end of the sheath, the base end of the sheath 1 is connected to the operation part in a removable manner and an engaging part to be engaged with an operation member 14 disposed at the part 10 is formed at the rod 7. In the treating implement, all the part of the outer surface of the rod 7 excepting for the engaging part is covered with an electrically insulating material 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency treatment instrument for an endoscope which is used by passing a high-frequency current through a treatment instrument insertion channel of an endoscope.

[0002]

2. Description of the Related Art Generally, a high-frequency treatment instrument for an endoscope is provided with a high-frequency electrode at the tip of an electrically insulating sheath inserted into and removed from a treatment instrument insertion channel of the endoscope, and is connected to the high-frequency electrode. A conductive rod is disposed protruding from the proximal end of the sheath.

An engaging portion for engaging with an operating member disposed on the operating portion is provided at a protruding end of the rod so that a high-frequency current can be supplied from the operating member to the high-frequency electrode via the rod. Has become.

[0004]

In general, the operation section of a high-frequency treatment instrument for an endoscope does not allow the surgeon to touch a portion serving as a conductive path of a high-frequency current in consideration of the electrical safety of the surgeon. Has taken.

However, most of the high-frequency treatment instruments for endoscopes
The endoscope has a structure in which a portion of the endoscope that is inserted into and removed from the treatment instrument insertion channel and the operation unit are detachably connected. For this reason, there is a possibility that an operator touches a rod that is used by being connected to an operation unit that does not sufficiently consider electrical safety and through which a high-frequency current flows, and a burn accident may occur.

Accordingly, the present invention provides a safety device in which an operator does not have a risk of getting burned by touching a rod protruding from a base end of a sheath, even when used in connection with an operation unit for which electrical safety is not sufficiently considered. An object of the present invention is to provide a high-frequency endoscopic high-frequency treatment instrument.

[0007]

In order to achieve the above-mentioned object, a high-frequency treatment instrument for an endoscope according to the present invention is provided with a distal end of an electrically insulating sheath inserted into and removed from a treatment instrument insertion channel of the endoscope. A high-frequency electrode is provided, and a conductive rod connected to the high-frequency electrode is disposed so as to protrude from a base end of the sheath, and a base end of the sheath is detachably connected to an operation unit to perform the operation. In an endoscopic high-frequency treatment instrument in which an engaging portion that engages with an operating member disposed on a portion is provided on the rod, all portions of the outer surface of the rod other than the engaging portion are electrically insulated. Characterized by being coated with.

[0008]

Embodiments of the present invention will be described with reference to the drawings. FIG. 2 shows a high-frequency snare, which is one of the high-frequency treatment instruments for an endoscope, and a flexible sheath 1 inserted and removed through a treatment instrument insertion channel (not shown) of the endoscope.
Is formed of an electrically insulating tube such as a tetrafluoroethylene resin tube.

A conductive operation wire 2 is inserted through the entire length of the flexible sheath 1 so as to be able to advance and retreat in the axial direction, and is connected to the distal end of the operation wire 2 by moving the operation wire 2 forward and backward. Conductive snare loop 3
(High-frequency electrode) enters and exits from the distal end of the flexible sheath 1,
It expands and contracts due to its own elasticity.

Reference numeral 4 denotes a buckling tube for preventing the proximal end portion of the flexible sheath 1 from being sharply bent and bent. The present invention is not limited to a high-frequency snare, and can be applied to various high-frequency treatment instruments for endoscopes having a high-frequency electrode at the tip.

An operation wire 2 is provided at the proximal end of the flexible sheath 1.
An operation unit 10 for reciprocating operation is connected detachably. A first finger hook 12 for engaging the thumb of the operator's hand is provided at the proximal end of the rod-shaped operation unit main body 11, and a second finger hook for engaging the index finger and the middle finger is provided. A slider 14 on which a finger hook 13 is formed is slidably engaged along the operation unit main body 11. The slider 14 is provided with a high-frequency power supply connection terminal 30.

FIG. 1 shows the operation unit 10 partially enlarged. Reference numeral 5 denotes a proximal end cap attached to the proximal end of the flexible sheath 1, which is inserted into a square hole 15 formed at the distal end of the operation section main body 11.

The connecting and fixing cylinder 17 for connecting and fixing the base end cap 5 to the operating section main body 11 is fixed so that it cannot move in the axial direction, but can be rotated around the axis by 45 °, for example. It is attached in a state that surrounds it.

FIG. 3 shows a cross section taken along line AA in FIG. 1, and the illustration of the portion inside the base end cap 5 is omitted. Slits 11a are formed in the distal end portion of the operation unit main body 11 at intervals of, for example, 90 ° in a direction parallel to the axis, so that the portion is elastically deformed inward without the base end cap 5, so that the connection fixed cylinder is formed. 17 can be attached.

As shown in FIG. 4, which shows a cross section taken along line BB in FIG. 1, a square hole 17a through which the square shaft portion 5a of the base end cap 5 passes is formed in the front end wall of the connecting and fixing cylinder 17. A square hole 15 formed in the inner part of the operation unit main body 11 therefrom
The square shaft portion 5a of the proximal end cap 5 of the flexible sheath 1 can be fitted therein.

As a result, the base end cap 5 can be freely disengaged from the operation section main body 11, and by rotating the connecting and fixing cylinder 4 by 45 ° as shown in FIG.
The square hole 17a of the connection fixing cylinder 17 is the square shaft portion 5a of the base end cap 5.
The base end cap 5 is locked to the operation section main body 11.

The right half of FIG. 1 shows an engagement portion of the slider 14 with the operation section main body 11, and a proximal end of the operation wire 2 inserted into the flexible sheath 1 is A rod 7 made of a conductive metal rod is connected in the proximal end portion of the flexible sheath 1. The rod 7 is passed through a center position of a slit 18 formed in the longitudinal direction of the operation section main body 11 (that is, an axial position of the operation section main body 11).

Reference numeral 19 denotes a conductive terminal receiving member held in a state of being held by the slider 14 in the slit 18, and a thick stop portion 7 formed at the base end of the rod 7.
a is inserted into a bottomed hole formed at the center position of the terminal receiving member 19.

At the root of the high-frequency power supply connection terminal 30 having the contact pin 31 protruding from the center of the connection tube 32, a male screw portion 33 that passes through the slider 14 from the side and is screwed into the terminal receiving member 19 is provided. 31 and is provided integrally with
The distal end of the male screw part 33 comes into contact with the vicinity of the protruding end of the rod 7.

Therefore, by pushing the rod 7 against the terminal receiving member 19 with the tip of the male screw portion 33, the rod 7 and the slider 14 are integrated, and by operating the slider 14 forward and backward, the operation wire 2 is connected. The snare loop 3 at the distal end of the flexible sheath 1 can be operated remotely by moving it forward and backward.

Conversely, the high-frequency power supply connection terminal 30 is rotated in a direction to loosen the screwing of the male screw portion 33, and the male screw portion 33 is rotated.
By retracting the distal end of the flexible sheath 1 from the rod 7, the rod 7 can be extracted from the terminal receiving member 19, and the treatment instrument unit and the operating unit 10 in a state where the rod 7 protrudes from the base end of the flexible sheath 1 can be arbitrarily set. Can be connected / disconnected.

In the connected state, by connecting a connection plug of a high-frequency power supply cord (not shown) to the high-frequency power supply connection terminal 30, the contact pin 31 is connected to the terminal receiving member 19, the rod 7, the operation wire 2, and the like. A high-frequency current can be supplied to the snare loop 3.

However, except for a portion near the protruding end pressed by the male screw portion 33 of the high frequency power supply connection terminal 30, all parts of the outer surface of the rod 7 are made of an electric material such as a tetrafluoroethylene resin tube. It is covered with an insulating tube 8. The distal end of the electrically insulating coating tube 8 reaches the inside of the flexible sheath 1.

Therefore, for example, even when the pirated operation unit 10 with low electrical safety is used, in which the slot 18 is wide and the operator's fingertip or the like may enter the slot 18, The fingertip of the surgeon touches the electrically insulating coating tube 8 covered by the rod 7 and does not touch the rod 7, so there is no risk of burn injury.

FIG. 6 shows an operation unit 10 according to a second embodiment used in the high-frequency treatment device for an endoscope according to the present invention. Only the structure of the slider 14 shown in the right half is the first operation unit. The third embodiment is different from the first embodiment in that the configuration of the other parts is the same as that of the first embodiment.

Reference numeral 21 denotes an electrically insulating block which is held in a state of being held by the slider 14 in the slit 18, and a stopper 7 a formed at the base end of the rod 7 is provided.
It is inserted into a bottomed hole formed at the center position of the electrically insulating block 21.

Reference numeral 22 denotes a lock release button for fixing / releasing the stopper 7a of the rod 7 with respect to the slider 14. The stopper 7a of the rod 7 is barely attached to the slide plate 23 connected to its axial position. The slit 24 is formed to have a width that can pass through.

The lock release button 22 is urged outward by a compression coil spring 25. When the lock release button 22 is pushed in against the urging force, the locking portion 7a
The slide plate 23 is set at a position where it can pass through, and the base end of the rod 7 can be disengaged from the slider 14.

When the finger is released from the lock release button 22, the urging force of the compression coil spring 25 causes the rod 7 to move into the narrow portion of the slit 24 through which the stopper 7 a cannot pass.
Is set, and the base end of the rod 7 is fixed to the slider 14.

Reference numeral 26 denotes a conductive pin which serves as a stopper, a guide, and a conductive function, and protrudes from the conductive terminal receiving member 19 so as to engage with the slit 24. The high-frequency power supply connection terminal 30 is provided on a surface opposite to the lock release button 22, and the connection tube 32 is formed integrally with the slider 14.

The rear end face of the terminal receiving member 19 through which a high-frequency current flows inside the slider 14 is covered with the above-mentioned electrically insulating block 21, and the front end face of the terminal receiving member 19 has a stepped portion formed on the slider 14. The operation unit 10 is covered with an electrically insulating insulating plate 27 which is sandwiched and fixed between the operation unit 10 and the electric operation safety.

[0032]

According to the present invention, the outer surface of the conductive rod connected to the high-frequency electrode at the distal end of the sheath and protruding from the proximal end of the sheath is related to the operating member disposed at the operating portion. All parts other than the mating engaging parts are covered with an electrical insulating material, so that the surgeon directly touches the rod through which the high-frequency current flows, even when used in connection with the operating part where electrical safety is not sufficiently considered. Therefore, there is no risk of a burn accident of the operator, and the electrical safety can be improved.

[Brief description of the drawings]

FIG. 1 is a partially enlarged cross-sectional view of an operation unit of a high-frequency treatment instrument for an endoscope according to a first embodiment of the present invention.

FIG. 2 is a plan view showing the overall configuration of a first high-frequency treatment instrument for an endoscope according to the present invention.

FIG. 3 is a sectional view taken along line A- in FIG. 1 of the first embodiment of the present invention;
It is A sectional drawing.

FIG. 4 is a cross-sectional view of the first embodiment of the present invention, taken along line BB when the connecting and fixing cylinder in FIG. 1 is in an unfixed state.

FIG. 5 is a sectional view taken along the line BB of the embodiment of the present invention when the connecting and fixing cylinder in FIG.

FIG. 6 is a partially enlarged cross-sectional view of an operation unit of a high-frequency treatment instrument for an endoscope according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flexible sheath 2 Operation wire 3 Snare loop (high frequency electrode) 7 Rod 8 Electrically insulating coating tube 10 Operation part 14 Slider (operation member) 30 High frequency power supply connection terminal

Claims (1)

[Claims] A high-frequency electrode is provided at a distal end of an electrically insulating sheath inserted into and removed from a treatment instrument insertion channel of an endoscope, and a conductive rod connected to the high-frequency electrode is connected to a proximal end of the sheath. And an endoscope provided with the base end of the sheath detachably connected to the operation unit, the engagement unit engaging with an operation member arranged on the operation unit, provided on the rod. In the high-frequency treatment instrument for, all parts of the outer surface of the rod other than the engagement portion,
A high-frequency treatment instrument for an endoscope, which is coated with an electric insulating material.