JPS6219859B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an electrode for an endoscope.

In general, a method using high-frequency current is well known as a means for incising tissue to be incised, such as an affected area generated within a body cavity. This means that a wire to which a voltage of one polarity of the high-frequency power source is applied is inserted into the body cavity through the channel of the endoscope, while a voltage of the other polarity of the high-frequency power source is applied to the external surface of the human body. After bringing the electrode plate into contact and bringing the tip of the wire into contact with the tissue to be incised, by applying a voltage to the wire and the electrode plate, the tissue to be incised is caused by the high frequency current flowing between them. There is a so-called monopolar type that makes incisions.

However, according to such a monopolar type means, since the current flows in areas other than the tissue to be incised, there is a risk that burns may occur, for example, on the skin where the electrode plate is in contact.

To solve this problem, it would be better to use a so-called bipolar type electrode, in which two electrodes to which voltages of different polarities are applied are placed close to each other, but conventional bipolar type electrodes
For example, since it is constructed by adhering and fixing electrodes to different sides of a columnar insulator, it has the disadvantage of being more complex and larger in diameter than a wire-shaped monopolar type, making it impractical.

This invention was made based on the above-mentioned circumstances, and its purpose is to create a bipolar type that does not pose the risk of causing burns due to the flow of current into unnecessary parts, and also to simplify the structure and increase the diameter. An object of the present invention is to provide an electrode for an endoscope that can be used without the need for an endoscope.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In the figure, 1 is a flexible tube with an operating section 2 provided at its base end. An electrode 3 is inserted through the flexible tube 1 so as to be freely advanced and retracted. This electrode 3 is
a pair of conductive wires 5 covered with an insulating film 4;
The conductive wires 6 are twisted together into a rope shape, and the insulating film 4 is removed at a portion corresponding to the tops of the convex portions 5a and 6a formed by the pair of conductive wires 5 and 6, respectively, on one side of the tip portion 3a. A plurality of exposed parts of 5 and 6, in this example, 2 each
Individual exposed portions 7 and 8 are formed. An operation knob 9 for moving the electrode 3 forward and backward is attached to the rear end portion of the electrode 3. Furthermore, terminals 10 and 11 are fixed to the rear ends of each conductive wire 5 and 6, one terminal 10 is connected to an anode 14 of a high frequency power source 13 via a lead wire 12, and the other terminal 11 is also connected to a lead wire. It is connected to the cathode 16 via 15.

In order to incise tissue to be incised in a body cavity using the electrode 3 having such a configuration, first, the tip portion 3a of the electrode 3 is retracted into the flexible tube 1, and then the flexible tube 1 is removed. It is introduced into the body cavity through the channel of an endoscope that has been previously inserted into the body cavity. When the distal end portion of the flexible tube 1 reaches the target site, the operation knob 9 is operated to cause the distal end portion 3a of the electrode 3 to protrude from the distal opening of the flexible tube 1, and the high frequency power source 13 is activated. Then, the exposed portion 7 of the conductive wire 5 connected to the anode 14 of the high frequency power source 13...
Since a high frequency current flows from . At this time, by reciprocating the electrode 3 by a small distance, the tissue to be incised can be evenly incised.

Note that the present invention may be similar to the second embodiment shown in FIG. 3 or the third embodiment shown in FIG. 4. That is, in the embodiment shown in FIG. 3, a first through hole 17 is bored in the middle part of the flexible tube 1, and a second through hole 18 is bored at the tip, and the tip of the electrode 3 is inserted from the first through hole 17. Part 3a was derived. Then, the end of the tip portion 3a of the electrode 3 was inserted into the second through hole 18, and the stopper 19 prevented it from coming out. According to such a configuration, by pulling the electrode 3 using the operation knob 9, the tip portion of the flexible tube 1 is curved, and the tip portion 3a of the electrode 3 is accordingly curved.
Since the angle of the electrode 3 can be changed, even if the electrode 3 is in a straight line, it is difficult to incise the area.

Further, in the third embodiment shown in FIG. 4, the electrode 3 is applied to a so-called snare, and when the tip portion 3a of the electrode 3 is made to protrude from the tip opening of the flexible tube 1, the tip portion is It was held by a slider 20 so as to form a loop. In addition, each conductive wire 5, 6
The exposed portions 7 and 8 were provided toward the inside of the loop. With this configuration, it is possible to easily incise, for example, a polyp as the tissue to be incised.

In addition, as another embodiment of the present invention, although not shown, the electrode may be constructed by twisting three or more conductive wires, and furthermore, the exposed portion may be formed not only on one side of the tip of the electrode but also on both sides or in three directions. More than one may be provided. Further, the number of exposed portions formed at the tip portion of the electrode is not limited at all, and at least one exposed portion may be provided for each polarity of conductive wire.

Furthermore, by increasing the exposed area of the pair of polar conductive wires at the tip of the electrode, the range that can be incised can be sufficiently widened.

As described above, the present invention twists a plurality of conductive wires coated with insulation, and removes the insulation coating at the tip portions of these conductive wires so that at least one pair of polar conductive wires is exposed, thereby forming an electrode. . In other words, a bipolar type electrode without the risk of causing burns can be constructed much more easily than in the past. Moreover, since this electrode is simply a combination of multiple conductive wires covered with insulation,
It is possible to make the diameter dimension sufficiently small.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention, FIG. 2 is an enlarged view of the tip of the electrode, and FIG.
4 and 4 are side views of the electrode tip portion showing other embodiments of the present invention, respectively. 3... Electrode, 3a... Tip portion, 4... Insulating film, 5, 6... Conductive wire, 7, 8... Exposed part, 13
...High frequency power supply.

Claims (1)

[Claims] 1 A plurality of electrically conductive wires each having an insulated coating are applied to at least one of the wires, and a voltage of one polarity of the power supply is applied to the remaining wires, and a voltage of the other polarity is applied to the remaining electrically conductive wires. An endoscope electrode made by removing at least one pair of polar conductive wires to expose them.