JPH0763482B2 - Electrosurgical unit - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrosurgical instrument used for surgery and the like, and more particularly to a bipolar electrosurgical instrument.

[0002]

2. Description of the Related Art Conventionally, a bipolar type electrosurgical unit for performing treatment such as coagulation of living tissue with high frequency power has been known, is useful for treatment of fine parts, and is widely used in brain surgery and ophthalmology. .

When performing coagulation with a bipolar type electrosurgical device, if the output continues for a long time depending on the method of treatment, there is a problem that excessive coagulation occurs and partial necrosis of living tissue occurs. There has been a problem that carbonized tissue of living tissue adheres to the working portion of the bipolar tweezers as a means and is quickly soiled.

In order to solve this problem, for example, the load characteristic shown in FIG. 3 of Japanese Patent Laid-Open No. 60-72544 shown in FIG.
An electrosurgical instrument has been proposed that forcibly changes the load characteristic of R to a steeper characteristic and reduces the generated power to prevent excessive coagulation when the coagulation treatment progresses and the impedance of the treated portion rises. ing.

[0005]

SUMMARY OF THE INVENTION The conventional electrosurgical unit is
If the impedance of the living tissue to be treated is largely deviated from the load characteristic, the output is not substantially generated and sufficient treatment cannot be performed. There is also a problem that, even if forcibly sharp characteristics are used, if the set output power value is not appropriate, excessive solidification marks may be formed,
Similarly, even if the steepness is forcibly used, there is a problem that excessive dehydration occurs when the treatment of heat fusion of the cornea is performed in ophthalmology.

The present invention has been made to solve the above problems, and an object thereof is to provide an electrosurgical instrument capable of reliably performing a desired treatment by an operator even under various circumstances. is there.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, the electrosurgical instrument, originating RF power
The output section that generates the load and outputs it to the load, and the load impedance of the load.
Output from the output unit and a detection unit that detects impedance.
And a control unit for controlling high-frequency power
And the specified negative in the load impedance fluctuation range.
The output power value is drastically reduced at the load impedance.
Set the operating characteristics with the maximum point in the control unit
And the load impedance at the maximum point
It has a setting unit that changes the operating characteristics by changing the value.
The control unit controls the operating characteristics set by the setting unit.
And the load impedance detected by the detection unit
It is characterized in that the output power value of the output unit is controlled in accordance with .

Here, the maximum point is the movement of the output power value.
It is an inflection point of the work characteristics, and is output when the maximum point is exceeded.
The power value decreases.

[0009]

In the electrosurgical instrument of the present invention, the setting section
Set operating characteristics in the controller. Settings in this setting section
In the load impedance fluctuation range,
Output power value drops sharply at load impedance
It is possible to set operating characteristics that have
Yes, the load impeder corresponding to this maximum point
You can change the operating characteristics by changing the value of
It The detection unit also detects the load impedance of the load.
It The control unit controls the operating characteristics set by the setting unit.
And the load impedance detected by the detector.
Control the output of high frequency power output from the output unit.
It In the present invention, a predetermined load level is set by using the setting unit.
Maximum at which the output power value drops sharply in pedestal
You can set operating characteristics that have points,
Do not leave excessive coagulation marks on the living tissue
Yes. In addition, the load impedance at the maximum point
The load impedance of the living tissue can be changed
Even if the dance is greatly deviated from the motion characteristics, the maximum point
Power supply by changing the load impedance of the
The salary price can be optimized.

[0010]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing an electrosurgical instrument according to the present invention.

As shown in FIG. 1, the electrosurgical instrument 10 has a high frequency power source 12 for supplying high frequency power, and an amplifier 14 for amplifying the high frequency power is connected to the high frequency power source 12. The output transformer 1 is provided in the amplifier 14.
6 is connected, and D is connected to the secondary side of the output transformer 16.
The C-cut capacitor 18 is connected. Further, the capacitor 18 is connected with an impedance measuring section 20 as a detecting means for measuring the impedance of the living tissue 100, and the impedance measuring section 20 is connected with a bipolar tweezer 22 as an output means.

Further, the amplifier 14 and the impedance measuring section 20 are connected to a control section 24 as a load characteristic control means for controlling the amplifier 14 according to the impedance value detected by the impedance measuring section 20.
A foot switch 26 and an operation panel unit 28 as a setting means for setting operation characteristics are connected to the switch 4.

As shown in FIG. 2, the operation panel section 28 has an output instruction lamp 30 indicating that a high frequency output is being generated, an output power value indicator 32 for displaying a set value of output power, and an output operation. Mode selection switches 34 and 36 for selecting a mode, an output level adjusting switch 38 for setting an output power value, coagulation level adjusting switches 40, 42 for setting a coagulation level, and a coagulation level set value indicator 44 for displaying a coagulation level set value. Is provided.

Next, the operation of this embodiment will be described.

The operator prepares the bipolar tweezers 22 and the like and operates the output level adjusting switch 38 while watching the output power value indicator 32 to set a desired output power. When the operator presses the mode selection switch 36 of the operation panel unit 28, the control unit 24 controls the amplifier 14 according to the preset load characteristics, and the amplifier 1
Reference numeral 4 amplifies the high frequency power supplied from the high frequency power supply 12. The high frequency power is supplied to the bipolar tweezers 22 via the output transformer 16, and the high frequency power supplied to the bipolar tweezers 22 treats the living tissue 100.

When the mode selection switch 34 is pressed,
The setting of the coagulation level is allowed, and the operator watches the coagulation level set value (10 steps from 0 to 10) while watching the coagulation level set value indicator 44 and the coagulation level adjustment switch 4
A desired coagulation level set value is set by 0 and 42.

For example, when the coagulation level is set to 5,
The control unit 24, which receives the signals from the coagulation level adjusting switches 40 and 42, sets the load characteristics as shown in FIG. 4, and displays “5” on the coagulation level set value indicator 44.

When the operator steps on the foot switch 26 to perform a treatment, the control section 24 which receives a signal from the foot switch 26 controls the amplifier 14 to generate an output. At this time, the impedance measuring unit 20 starts impedance measurement of the living tissue 100, and
While the impedance of 0 changes from 30 ohms to 170 ohms, the control unit 24 controls the amplifier 14 so that a predetermined power is generated at both extremes of the bipolar tweezers 22.

Then, when the treatment such as coagulation progresses and the living tissue 100 begins to dehydrate and the impedance starts to increase to reach 170 ohms, the control unit 2
4 quickly reduces the amplification factor of the amplifier 14 to reduce the output. This makes overtreatment less likely to progress,
Optimal treatment can be performed on the living tissue 100.

When the coagulation level is set to 0, the control unit 24 sets the load characteristic as shown in FIG. 5, displays "0" on the coagulation level set value indicator 44, and the impedance starts to increase. When the impedance reaches 70 ohms, the controller 24 quickly reduces the amplification factor of the amplifier 14 to reduce the output. When the coagulation level is set to 10, the control unit 24 sets the load characteristic as shown in FIG. 6, displays “10” on the coagulation level set value indicator 44, and the impedance starts to increase to 270 ohms. When it reaches, the control unit 24
Quickly reduces the amplification factor of the amplifier 14 and lowers the output.

According to the present invention, the degree of progress of the treatment of the living tissue 100 does not change with the output power as a parameter but changes with the impedance value of the living tissue 100 as a parameter. It can be a constant value. Further, it is possible to automatically set the output power value to an appropriate value based on the coagulation level value set as shown in FIG.

[0023]

As described above, according to the electrosurgical instrument of the present invention, the load state of the output means is detected by the detection means, and the load state of the output means detected by the detection means is detected and the setting means is used. Since the output of the output means is controlled by the load characteristic control means based on the set operation characteristic of the load characteristic control means, the impedance of the living tissue to be treated before the treatment largely deviates from the load characteristic. However, the output can be generated, sufficient treatment can be performed, and the output power value can be optimized to prevent the formation of excessive coagulation marks. Excessive dehydration can be prevented when the treatment is performed.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an electrosurgical unit according to the present invention.

FIG. 2 is a plan view showing an operation panel section of the electrosurgical unit according to the present invention.

FIG. 3 is a diagram of load characteristics of a conventional electrosurgical unit.

FIG. 4 is a diagram for explaining the operation of the present invention.

FIG. 5 is a diagram for explaining the operation of the present invention.

FIG. 6 is a diagram for explaining the operation of the present invention.

FIG. 7 is a diagram for explaining the operation of the present invention.

[Explanation of symbols]

 10 electrosurgical unit 14 amplifier 20 impedance measurement unit 22 bipolar tweezers 24 control unit 28 operation panel unit

Continuation of front page Examiner Yoshito Inazumi (56) References JP-A-60-72544 (JP, A) JP-A-3-168138 (JP, A)

Claims (1)

[Claims] 1. An output for generating high frequency power and outputting it to a load.
Force part and detection for detecting the load impedance of the load
And a high frequency power output from the output unit.
An electrosurgical instrument having a control unit, wherein a predetermined load impedance in a load impedance fluctuation range is provided.
The maximum poi that suddenly decreases the output power value in dance
The operating characteristics with the
, The value of the load impedance at the maximum point
Of the operating characteristic set by the setting unit.
And the load impedance detected by the detection unit
The output power value of the output unit is controlled according to
An electrosurgical instrument.