JPH0585177B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electrosurgical device that controls the output of high-frequency power according to load impedance.

[Prior Art] A so-called electrosurgical device, which is a device that uses heat generated by high-frequency power to incise and coagulate living tissue that is the target of surgery, is frequently used in surgical operations and the like.

This electrosurgical device has an output section that generates high-frequency power and outputs it to a load such as biological tissue.

Furthermore, this electrosurgical device is also provided with a detection section that detects load impedance and a control section that controls high frequency power output from the output section according to the load impedance detected by the detection section. Are known.

FIG. 3a shows the output power characteristics of a conventional electrosurgical device. The value of high frequency power output from the output section (hereinafter simply referred to as output power) is:
Generally, it depends on the internal impedance of the electrosurgical device and the load impedance of the load, but
Since the internal impedance is usually constant, the output power uniquely changes according to changes in the load impedance. In this manner, when the internal impedance of the electrosurgical instrument is a constant value, when the load impedance and the internal impedance are the same value Z ₀ , the output power takes the maximum value, the so-called peak value.

In an electrosurgical device with an output power characteristic having a peak value as _shown in FIG _.
Deviations from this will reduce the output power and reduce cutting capacity under load. Conversely, if the load impedance is changing closer to the matching value Z ₀ , the output power delivered to the load increases;
The cutting capacity against load is increased.

Such a change in load impedance can easily occur due to a change in the wet state of the load. This change corresponds, for example, to a case where the load related to incision changes from a muscle layer to a fat layer or vice versa.

Furthermore, the above-mentioned fluctuation in output power may lead to insufficient or excessive incision during load incision, and there is a possibility that stagnation or excessive incision may occur that is not intended by the operator.

In order to solve such problems caused by variations in output power due to variations in load impedance, an electrosurgical device has been proposed in which the output power is constant in a predetermined range of variations in load impedance. An example of such an electrosurgical device is the electrosurgical device previously proposed by the applicant. This surgical instrument according to the applicant's previous proposal detects the load impedance without affecting the output power, and further detects the load impedance in a manner that does not affect the output power, and further detects the output power related to the generation of high-frequency power as the load impedance changes. This is an electrosurgical device that controls the power amplification gain etc. of the section to keep the output power to the load constant.

As shown in FIG. 3b, the electrosurgical device according to the applicant's previous proposal has an output power characteristic in which the output power is constant in a predetermined load impedance variation range.

[Problems to be Solved by the Invention] However, the conventional electrosurgical device having such a configuration has the following problems.

For example, an electrosurgical device having the output power characteristic shown in FIG. 3b has a problem in that the incision depth is more likely to fluctuate compared to an electrosurgical device having the output power characteristic shown in FIG. 3a.

Conventionally, an electrosurgical device having an output power characteristic shown in FIG. 3a has been used more frequently than an electrosurgical device having an output power characteristic shown in FIG. 3b, so the electrosurgical device shown in FIG. For a surgeon who is accustomed to using an electrosurgical device having an output power characteristic shown in Fig. 3b, there is a problem in that the electrosurgical device having the output power characteristic shown in Fig. 3b is difficult to use in terms of usability. .

The present invention was made with the aim of solving such problems, and it is possible to select one of a plurality of output power characteristics according to the wishes of the operator,
It is an object of the present invention to provide an electrosurgical instrument capable of outputting high-frequency power according to selected output power characteristics, and thus capable of performing incision of a load.

[Means for Solving the Problems] In order to achieve the above object, the present invention has a control unit having a plurality of characteristic maps, and the characteristic maps are maps showing output power characteristics, and the control unit has a plurality of characteristic maps. The present invention is characterized in that it includes a selection section that is connected to the section and selects one of the plurality of characteristic maps, and controls power according to the load impedance based on the characteristic map selected by the selection section. Furthermore,
At least one of the plurality of characteristic maps may be a characteristic map that exhibits a characteristic that provides substantially constant high-frequency power in a predetermined load impedance variation region.

Similarly, at least one of the plurality of characteristic maps may be a characteristic map showing a characteristic in which the high frequency power reaches a peak value at a predetermined load impedance value.

Furthermore, at least two of the plurality of characteristic maps may exhibit a characteristic in which the high frequency power reaches a peak value at a predetermined load impedance value, and the peak values in each of the two characteristic maps may be different. I do not care.

In addition, the characteristic map may be a characteristic map showing a characteristic that the amount of variation in high frequency power in a predetermined load impedance variation region is within a predetermined high frequency power variation range.

Furthermore, this high frequency power fluctuation range may be in a range of 0.9 times or more and 1.1 times or less of a predetermined reference value.
Further, the load impedance variation region may have a lower limit of 20Ω or more and 200Ω or less, and an upper limit of 500Ω or more and 3 kΩ or less.

Additionally, the control section may include a changing section that changes the characteristic map employed for high frequency power control from the currently employed characteristic map to another characteristic map.

The changing portion may be provided in a grip portion held by an operator.

[Function] In the electrosurgical instrument of the present invention, the load impedance detected by the detection unit is referred to the characteristic map selected by the selection unit, and the load impedance is determined according to the value of the necessary high-frequency power obtained as a result of this reference. hand,
The control section controls the value of high frequency power output from the output section. Since a plurality of characteristic maps are prepared, a desired output power characteristic can be obtained by selecting one characteristic map by the selection section as necessary.

Furthermore, in the electrosurgical device according to the second aspect of the present invention, a characteristic map exhibiting a characteristic that provides substantially constant high-frequency power in a predetermined load impedance variation region is selected as necessary.

In the electrosurgical device according to the third aspect of the present invention, a characteristic map indicating a characteristic in which the high frequency power reaches a peak value at a predetermined load impedance value is selected as necessary.

In the electrosurgical device according to the fourth aspect, one of at least two characteristic maps exhibiting a characteristic in which the high frequency power reaches a peak value at a predetermined load impedance value is selected as necessary.

In the electrosurgical device according to the fifth aspect, the amount of variation in high frequency power in the predetermined load impedance variation range is within the predetermined high frequency power variation range.

In the electrosurgical device according to claim 6, the amount of variation in high frequency power in the predetermined load impedance variation region is 0.9 times or more and 1.1 times or less of the predetermined reference value.

In the electrosurgical device according to claim 7, the lower limit is
In a load impedance variation range of 20Ω or more and 200Ω or less, with an upper limit of 500Ω or more and 3KΩ or less, the amount of variation in high-frequency power falls within a predetermined high-frequency power variation range.

In the electromagnetic device according to claim 8, the characteristic map can be changed as necessary.

In the electrosurgical instrument according to claim 9, since the changing part for changing the characteristic map is provided in the grip part held by the operator, during the operation by the operator,
The characteristic map can be easily changed as needed.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 shows the configuration of an electrosurgical device according to an embodiment of the present invention.

In this embodiment, a high frequency amplifier 10 that outputs high frequency power is provided, and the high frequency amplifier 1
0 is connected to the load 1 via the insulator 12 as necessary.
00. That is, the high frequency power output from the high frequency amplifier 10 is supplied as heat to the load 100 as necessary, and the load 100 is, for example, cut out.

An impedance detection section 14 is attached to the output side of the high frequency amplifier 10. This impedance detection section 14 is further connected to a feedback amount adjustment section 16, and this feedback amount adjustment section 16 is further connected to a control section 18 that controls the output of the high frequency amplifier 10.

That is, the impedance detection section 14 is
detecting the load impedance of the load 100;
Information regarding the load impedance is supplied to the feedback amount adjustment section 16. In the feedback amount adjustment section 16, based on the information regarding the load impedance supplied from the impedance detection section 14,
The output correction amount is transmitted to the control section 18. Furthermore,
The control unit 18 instructs the high-frequency amplifier 10 to change the amplification gain, etc., based on the supplied output correction amount. In this way, the high frequency power (output power) supplied as heat to the load 100 is adjusted based on the load impedance detected by the impedance detection section 14.

Switches 20 and 22 are connected to the control section 18 via the insulator 12. Among these, the switch 20 turns on/off the incision mode output of the electrosurgical instrument, and the switch 22 turns on/off the coagulation mode output of the surgical instrument.

The control section 18 is connected to an operation panel section 24 and a switch 26 via the insulator 12.

Next, using FIG. 2, the operation panel section 2
4. The switch 26 will be explained in detail.

FIG. 2 shows the operation panel section 2 in this embodiment.
A portion of the panel display of No. 4 is shown.

In this figure, switches 28 and 30 provided on the panel of the operation panel section 24 are shown. The switches 28 and 30 are switches for selecting characteristics prepared on the control section 18.

In this embodiment, the control section 18 includes:
A characteristic map showing the output power characteristics as shown in FIG. 3a and a characteristic map showing the output power characteristics as shown in FIG. 3b are prepared. Of the switches 28 and 30, the switch 28 is a switch for selecting the characteristic map corresponding to FIG. 3b, and the switch 30 is for selecting the characteristic map corresponding to FIG. 3a. . By pressing either the switch 28 or 30, the characteristic map used for output power control in the control section 18 is selected and determined. For example, when the switch 28 is pressed, the control section 18 controls the high frequency amplifier 10 in accordance with the load impedance detected by the impedance detection section 14 based on the characteristic map corresponding to FIG. 3b. 3b, and the output power according to FIG. 3b is supplied to the load 100.

In addition, in FIG. 2, the switches 28 and 3
Indicator lamps 32 and 34 are provided to correspond to 0, but these indicator lamps 32 and 34
are lamps indicating that switches 28 and 30 are pressed, respectively.

The selection of output power characteristics by the switches 28 and 30 can be changed by the switch 26. That is, the switch 26 is a switch that changes the selection of the characteristic map according to the operator's needs, and is provided, for example, together with the switches 20 and 22, on a grip part that the operator holds.

As described above, according to the electrosurgical device according to this embodiment, it is possible to select and realize any one of the output power characteristics shown in FIGS. 3a and 3b as necessary. Therefore, when performing a surgical operation or the like using the electrosurgical instrument according to this embodiment, it is possible to select the output power characteristics according to the operator's needs.

In this embodiment, the selected characteristic maps are two characteristic maps corresponding to the two connection power characteristics shown in FIG. 3a and b, but the number of characteristic maps exceeds two. It doesn't matter if it's a number. In addition, as in this embodiment, there are two types of output power characteristics according to the characteristic map: one in which the output power reaches a peak value at a certain load impedance, and one in which the output power is constant in a certain load impedance fluctuation region. It doesn't have to be. For example, two or more characteristic maps related to output power characteristics as shown in FIG. 3a may be stored in the control section 18, and the peak values of the maps may be set to be different from each other.

Furthermore, the variation range of the characteristic map output power may be within ±10% of a predetermined reference value, and the variation range of the load impedance may exceed the lower limit.
It may be in the range of 20Ω or more and 200Ω or less, with an upper limit of 500Ω or more and 3kΩ or less.

In these cases as well, effects similar to those of the embodiment shown in FIG. 1 can be obtained.

[Effects of the Invention] As explained above, according to the electrosurgical device of the present invention, high frequency power can be controlled by selecting one characteristic map from a plurality of characteristic maps as necessary. . Therefore, the caster can select one from among multiple characteristic maps,
Improved usability and operability. Furthermore, the selection of this characteristic can be changed, and by providing a changing section for changing this selection in the grip, it becomes possible for the operator to easily change the selection.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing the configuration of an electrosurgical device according to an embodiment of the present invention, FIG. 2 is a display diagram showing a part of the panel display of the operation panel section in this embodiment, and FIG. , is a characteristic diagram showing the characteristics of high frequency power with respect to load impedance, and FIG.
3 is a characteristic diagram showing the characteristic that the high frequency power takes a peak time when the load impedance takes a matching value, and FIG. 3b is a characteristic diagram showing the characteristic that the high frequency power is constant in a predetermined region of the load impedance. 10... High frequency amplifier, 14... Impedance detection section, 16... Feedback amount adjustment section, 18... Control section, 20, 22, 26... Switch, 24... Operation panel section, 28, 30... Switch .

Claims (1)

[Claims] 1. An output section that generates high-frequency power and outputs it to a load, a detection section that detects the load impedance of the load, and an output section that outputs high-frequency power from the output section according to the load impedance detected by the detection section. an electrosurgical device, the control section having a plurality of characteristic maps showing the characteristics of the high frequency power with respect to the load impedance, the control section being connected to the control section, and the control section controlling the high frequency power. An electrosurgical device comprising: a selection section that selects one of a plurality of characteristic maps; and based on the characteristic map selected by the selection section, high-frequency power is controlled and output according to the load impedance. . 2. The electrosurgical instrument according to claim 1, wherein at least one of the plurality of characteristic maps is
An electrosurgical device that exhibits characteristics that provide approximately constant high-frequency power in a predetermined load impedance variation range. 3. The electrosurgical device according to claim 1 or 2, wherein at least one of the plurality of characteristic maps is
An electrosurgical device exhibiting characteristics in which high-frequency power reaches a peak value at a predetermined load impedance value. 4. The electrosurgical instrument according to claim 1, wherein at least two of the plurality of characteristic maps are
An electrosurgical device exhibiting a characteristic in which high-frequency power reaches a peak value at a predetermined load impedance value, and in which the peak values in each of the two characteristic maps are different. 5. The electrosurgical device according to claim 1, 2, 3, or 4, wherein the characteristic map shows a characteristic in which the amount of variation in high-frequency power in a predetermined load impedance variation region is within a predetermined high-frequency power variation range. vessel. 6. The electrosurgical instrument according to claim 5, wherein the high frequency power fluctuation range is within a predetermined reference value.
Electrosurgical device with a range of 0.9 times or more and 1.1 times or less. 7. The electrosurgical device according to claim 6, wherein the load impedance variation region has a lower limit.
Electrosurgical instruments in the range of 20Ω or more and 200Ω or less, with an upper limit of 500Ω or more and 3kΩ or less. 8. The electrosurgical device according to claim 1, 2, 3, 4, 5, 6, or 7, wherein the characteristic map adopted for high frequency power control in the control unit is changed from the currently adopted characteristic map to another characteristic. An electrosurgical device that has a changing part that changes to a map. 9. The electrosurgical device according to claim 8, wherein the changing portion is provided in a grip portion that is gripped by an operator.