JPH09173349A - Solidifying device for medical treatment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily judge whether a load circuit is disconnected, short-circuited or normal even when the output of high-frequency power source is changed. SOLUTION: A detection coil 10 is provided on the secondary side of output transformer 6 and a detected voltage V0 of this detection coil 10 is applied to the non-inverted input terminals of comparators 13 and 14. Upper and lower limit set voltages Va and Vb based on the output of variable resistor 8 to change resistance correspondingly to the output of high-frequency power source 5 are respectively applied to the inverted input terminals of comparators 13 and 14. When a biological tissue (load) is touched with a pair of electrodes 4a and 4a of bipolar tweezers 4, correspondingly to the output of high-frequency power source 5 and the state of load circuit, the detected voltage V0 of detection coil 10 is changed and the detected voltage V0 is compared with the set voltages Va and Vb respectively by the comparators 13 and 14 so that it can be judged whether the load circuit including the bipolar tweezers 4 is normal, short-circuited or disconnected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medical coagulation apparatus used for coagulation and incision of living tissue in surgery or the like.

[0002]

2. Description of the Related Art Conventionally, for example, as a method for embolizing an affected area of a blood vessel, which is a lesion site such as a cerebral aneurysm, a method of indwelling an in-vivo indwelling member such as a balloon or a coil on the affected area has been performed. The indwelling member is connected to the tip of an inductor such as a catheter or a guide wire and inserted into the affected area. A high-frequency power supply device is used to separate the in-vivo indwelling member inserted in the affected area from the inductor in this way.

This high frequency power supply device separates the in-vivo indwelling member by supplying a high-frequency voltage to a fusible connecting member for connecting the inductor and the in-vivo indwelling member to melt and cut the connecting member. In recent years, in addition to such a function, one having a function of determining an abnormality such as a disconnection or a short circuit of a load circuit including an inductor or the like to which a high frequency voltage is supplied has been provided.

Specifically, the high-frequency power supply device is constructed so as to be able to supply a high-frequency voltage necessary for melting the connecting member and a high-frequency voltage smaller than this, and the latter high-frequency voltage is supplied. In this case, the voltage corresponding to the impedance of the load circuit is measured without fusing the connecting members, and the measured voltage is compared with the setting range that is the voltage at normal times, so that disconnection, short circuit or normal Is configured to be determined.

[0005]

On the other hand, a pair of electrodes of bipolar tweezers is brought into contact with a tissue (blood vessel) of a living body,
There is a bipolar coagulation device which is a medical coagulation device that applies Joule heat to a tissue to coagulate the tissue and apply hemostasis by applying a high-frequency voltage to the tissue of the living body via the pair of electrodes.

When a breakage occurs in the relay cord of the electrode when using this bipolar coagulator, even if the main body of the coagulator is normal, it does not function as a device. In addition, when the pair of electrodes are in contact (so-called short-circuited state), Joule heat is not generated in the tissue sandwiched between the pair of electrodes even when a high frequency voltage is applied, and the tissue is coagulated. It cannot stop the bleeding. In such a case, there is no time for investigating the cause, especially during the operation, so that the user (operator) wants to judge the factor accurately.

Therefore, it has been considered to apply the above-mentioned impedance measuring method in the high-frequency power supply device to the bipolar coagulation device. However, in the bipolar coagulation device, the high-frequency voltage to be applied must be changed according to the function of the bipolar tweezers or the type of the target biological tissue, so that the measured voltage is not constant and short circuit, disconnection, and normal There is a problem in practical use because the setting range for making the judgment cannot be fixed.

The present invention has been made in view of the above circumstances, and an object thereof is medical treatment capable of easily determining whether the load circuit is broken, short-circuited, or normal even when the output of the high-frequency power supply changes. To provide a coagulation device for

[0009]

In order to achieve the above object, the present invention provides a high frequency power source, an output adjusting means for adjusting the output of the high frequency power source, a primary coil connected to the high frequency power source, and a primary coil thereof. An output transformer having a secondary coil magnetically coupled to the coil and a detection coil, a load circuit to which high-frequency power is supplied from the secondary coil of the output transformer, and an output voltage of the detection coil of the output transformer are detected. It comprises a voltage detecting means and a comparing means for comparing whether or not the voltage value detected by the voltage detecting means is within a predetermined setting range, and the comparing means detects the detected voltage by the voltage detecting means. It is characterized in that the state of the load circuit is detected in a plurality of stages by comparing with the set voltage by the output adjusting means. Claim 1). In this case, the load circuit may include bipolar tweezers (claim 2). Further, it is preferable to provide an informing means that operates based on the signal from the comparing means (claim 3).

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. First, in FIG. 2, a bipolar coagulation apparatus 1 which is a medical coagulation apparatus comprises a main body 2 and a pair of electrodes 4a, 4a connected to output terminals 2a, 2a of the main body 2 via relay cords 3, 3. 1 and a bipolar tweezers 4 having the same structure, and the basic electric circuit of the main body 2 has the structure shown in FIG.

In the figure, the high frequency power source 5 is, for example, 3
It is composed of a high-frequency oscillator circuit 5a for generating a high-frequency signal of 00 kHz and a high-frequency power amplifier circuit 5b, both of which are connected via a variable resistor 8. In this case, the variable resistor 8 is capable of steplessly adjusting the high frequency power according to the size of the coagulation site by the bipolar tweezers 4. Further, the output voltage from the variable resistor 8 is smoothed by the diode D and the capacitor C connected in the drawing, and the signal is input to the inverting input terminal of the comparator 13 via the amplifier AM and the comparator 14 via the resistor 15a. It is also input to the inverting input terminal of. Further, the inverting input terminal of the comparator 14 is grounded through the resistor 15b, and the above constitutes a comparing means.

The variable resistor 8 changes the output of the oscillating circuit 5a according to the resistance value and outputs it, and constitutes an output adjusting means, the details of which will be described later.

The output transformer 6 is provided with a coagulation / dissection secondary coil 9 magnetically coupled to the primary coil 7 and a detection coil 10 for voltage detection. Of these, both terminals of the secondary coil 9 are connected to the output terminals 2a, 2a.

A diode 11 and a capacitor 12 are connected between both terminals of the detection coil 10, and the voltage detection means is constituted by the above. One of the two terminals of the capacitor 12 is grounded, and the other is the comparator 1
They are connected to the non-inverting input terminals 3 and 14, respectively.

The output terminal of the comparator 13 is connected to one input terminal of the AND gate 16 via the inverter circuit 16a, and the output terminal of the comparator 14 is connected to the other input terminal of the AND gate 16 via the inverter circuit 16b. It is connected. The output terminal of the comparator 13 is connected to the AND gate 1 via the inverter circuit 17a.
7 and the output terminal of the comparator 14 is connected to the other input terminal of the AND gate 17. The output terminal of the comparator 13 is connected to one input terminal of the AND gate 18, and the output terminal of the comparator 14 is connected to the other input terminal of the AND gate 18. Further, the output terminals of the AND gates 16 to 18 are respectively connected to the short-circuit display lamp 19, which is a notification means.
It is connected to the normal display lamp 20 and the disconnection display lamp 21.

As described above, the high frequency power output from the high frequency power source 5 can be adjusted in voltage by operating the variable resistor 8. Accordingly, the user can change the voltage of the high frequency power supplied between the pair of electrodes 4a, 4a of the bipolar tweezers 4 according to the function of the bipolar tweezers 4 and the living tissue to be operated. It is like this. In this case, the functions of the bipolar tweezers 4 include “coagulation / hemostatic” and “incision”, and the function of “coagulation / hemostatic” can be obtained by relatively lowering the voltage between the pair of electrodes 4a and 4a. The "dissection" function can be obtained by relatively increasing the voltage between the electrodes 4a, 4a.

Further, for example, in the case of the "coagulation / hemostasis" function,
While the high frequency power is being supplied between the pair of electrodes 4a, 4a of the bipolar tweezers 4, the pair of electrodes 4a, 4a
When a is brought into contact with a blood vessel (load) 22 (see FIG. 2) which is a biological tissue, the current flowing through the secondary coil 9 changes according to the load state between the pair of electrodes 4a, 4a. According to the experiment, in the normal case, the impedance of the circuit (hereinafter referred to as the load circuit A) including the relay cords 3, 3 and the bipolar tweezers 4 and the blood vessel 22 is 150Ω.
On the other hand, when the electrodes 4a, 4a of the bipolar tweezers 4 and the relay cord 3 are short-circuited, the impedance of the load circuit A is less than 150Ω, and when the disconnection occurs, the load is The result is that the impedance of circuit A exceeds 400Ω,
A voltage corresponding to the impedance in each case is generated in the detection coil 10. Then, as shown in the electric circuit diagram of FIG. 1, the detection voltage V0 is obtained from the voltage generated in the detection coil 10 through the circuit composed of the diode 11 and the capacitor 12. Therefore, this detection voltage V
By comparing whether or not 0 is within a predetermined setting range, it is possible to determine whether the bipolar tweezers 4 are normal or whether the electrodes 4a, 4a and the relay cords 3, 3 are broken or short-circuited. You can

On the other hand, the voltage (detection voltage V0) generated in the detection coil 10 changes with the voltage of the high frequency output supplied from the high frequency power supply 5 to the primary coil 7 even if the impedance of the load circuit A is constant. According to the experiment, the resistance of the variable resistor 8 is adjusted to adjust the output of the high frequency power source 5 to "0.
The detected voltage V0 when changing from (MIN) "to" 10 (MAX) "is as shown in FIG. Incidentally, FIG. 3 shows a case where the outputs are set to "1", "2", "3", "4", "5" and "6". For example, when the output of the high frequency power supply 5 is set to "3" and the pair of electrodes 4a, 4a of the bipolar tweezers 4 is brought into contact with the blood vessel 22, the detection coil 10 detects when the impedance is 150Ω to 400Ω. The voltage V0 is 1.5V to 3.5V.
On the other hand, when the output of the high frequency power source 5 is set to "6" and the pair of electrodes 4a, 4a of the bipolar tweezers 4 are brought into contact with the blood vessel 22, the impedance is 150Ω.
When it is ˜400Ω, the detection voltage V0 of the detection coil 10 is 5V˜9V.

Based on the above experimental results, the setting range set in the comparison means, that is, the comparators 13 and 14
The set voltage signal input to is configured to change according to the output of the high frequency power supply 5. The setting voltage is adjusted by adjusting the output voltage of the variable resistor 8 connected to the high frequency oscillation circuit 5a, and the variable resistor 8 can adjust the high frequency power supply 5 and the output. In this embodiment, the variable resistor 8 functions as an output adjusting means and a setting range adjusting means.

Next, the operation of the above embodiment will be described. When high frequency power is supplied from the high frequency power supply 5 to the primary coil 7, high frequency sine wave power is supplied between the pair of electrodes 4 a, 4 a of the bipolar tweezers 4 based on the induced voltage induced in the secondary coil 9. At this time, the user will perform the operation while changing the voltage of the high frequency power supplied to the primary coil 7 according to the target blood vessel 22.
First, as an example of applying a relatively low-frequency high-frequency power between the pair of electrodes 4a, 4a of the bipolar tweezers 4, a case where the output of the high-frequency power supply 5 is set to "3" will be described with reference to FIG. explain.

When the variable resistor 8 is operated to set the output of the high frequency power source 5 to "3", the upper limit setting voltage Va = 3.5V is determined by the comparator 13 according to the output "3" of the high frequency power source 5.
Input to the inverting input terminal of the lower limit setting voltage Vb = 1.5
V is input to the inverting input terminal of the comparator 14. In this state, the pair of electrodes 4a, 4a is brought into contact with the blood vessel 22. Then, according to the load state (impedance of the load circuit A) between the pair of electrodes 4a, 4a, the detection voltage V
0 changes.

The impedance of the load circuit A is 150Ω
In the normal case of 400Ω, 1.5V ≦
Since V0 ≤ 3.5V, the output of the comparator 13 is a low level "0" signal, and the output of the comparator 14 is a high level "1" signal. The output of the comparator 13 becomes a "1" signal by the inverter 17a and is input to one input terminal of the AND gate 17, and the output of the comparator 14 is input to the other input terminal of the AND gate 17. Output becomes high level "1", and the normal display lamp 20 is turned on. On the other hand, the output of the comparator 13 is connected to the inverter 16 at one input terminal of the AND gate 16.
The "1" signal is input via a, and the output of the comparator 14 is input to the other input terminal as a "0" signal via the inverter 16b. Therefore, the output of the AND gate 16 is " It becomes "0" and the short-circuit display lamp 19 does not light up. The output of the AND gate 18 also becomes "0", and the disconnection display lamp 21 does not light up.

When the normality indicating lamp 20 is turned on, the pair of electrodes 4a, 4a of the bipolar tweezers 4 is turned on.
If the blood vessel 22 is left sandwiched between, the high frequency sine wave power is supplied between the pair of electrodes 4a, 4a based on the induced voltage induced in the secondary coil 9 in the output transformer 6.
At this time, the output of the high frequency power supply 5 is set to "3",
If sinusoidal power having a voltage suitable for the function of “coagulation / hemostasis” is supplied between the pair of electrodes 4a, 4a, the blood vessel 2 is thereby supplied.
It is possible to generate Joule heat in 2 to coagulate the blood vessel 22 and stop the bleeding.

Next, the case where it is determined that a short circuit has occurred in the electrodes 4a, 4a or the relay cords 3, 3 will be described. In this case, the impedance of the load circuit A is less than 150Ω, and the detection voltage V0 is V0 <1.5.
Since it becomes V, the comparators 13 and 14 output a "0" signal. Therefore, the "1" signal is input to both input terminals of the AND gate 16, the output of the AND gate 16 becomes "1", and the short-circuit display lamp 19 is energized and lit. On the other hand, since "1" is input from the inverter 17a to one input terminal of the AND gate 17 and "0" is input to the other input terminal of the comparator 14, the output of the AND gate 17 becomes "0". The normal display lamp 20 does not light up. Further, since the output of the AND gate 18 also becomes "0", the disconnection display lamp 21 does not light up.

Next, a case will be described in which it is determined that the relay cords 3, 3 etc. are broken. in this case,
Since the impedance of the load circuit A exceeds 400Ω and the detection voltage V0 is V0> 3.5V, the comparator 13
And 14 output a "1" signal. Therefore, the "1" signal is input to both input terminals of the AND gate 18, the output of the AND gate 18 becomes "1", and the disconnection display lamp 21 is energized and lit. On the other hand, "0" is input from the inverter 17a to one input terminal of the AND gate 17, and the comparator 1 is input to the other input terminal.
Since "1" is input from 4, the output of the AND gate 17 becomes "0" and the normal display lamp 20 does not light. Moreover, since the output of the AND gate 16 becomes "0", the short-circuit display lamp 19 does not light up.

On the other hand, as described above, when the output of the high frequency power source 5 is set to "3" and the hemostasis of the blood vessel 22 is not properly performed, the output is sequentially increased. , Output of high frequency power supply 5 is "6"
When set to, the resistance of the variable resistor 15 changes accordingly, and the upper limit setting voltage Va = 9V is set to the comparator 13
And the lower limit setting voltage Vb = 5V is input to the inverting input terminal of the comparator 14. In this state, when the pair of electrodes 4a, 4a is brought into contact with the blood vessel 22, the detection voltage V0 proportional to the load state between the pair of electrodes 4a, 4a is input to the non-inverting input terminals of the comparators 13 and 14. In this case, by setting the output of the high-frequency power source 5 to "6", the detection voltage V0 becomes higher than that when the output of the high-frequency power source 5 is set to "3", which corresponds to this. Upper and lower limit set voltage Va
Since Vb and Vb are input to the comparators 13 and 14, it is possible to determine whether the bipolar tweezers 4 are normal, short-circuited or broken, as in the case where the output of the high frequency power supply 5 is set to "3".

When the output of the high frequency power source 5 is set to a value other than "3" or "6", the description thereof will be omitted. However, as in the case described above, according to the output of the high frequency power source 5, The lower limit setting voltages Va and Vb are input to the inverting input terminals of the comparators 13 and 14, respectively, and it is possible to determine whether the bipolar tweezers 4 are normal, short-circuited, or broken.

As described above, the bipolar coagulation apparatus 1 according to the present embodiment changes the output of the high frequency power source 5 according to the state of the target blood vessel 22.
In order to determine whether the bipolar tweezers 4 are normal, disconnected or short-circuited, the upper and lower limit set voltages Va and Vb are changed in accordance with the change in the output of the bipolar tweezers 4. It is possible to judge whether the bipolar tweezers 4 are normal, broken, or short-circuited each time while changing the output of 5, and the operation can be performed quickly.

The detection voltage V0 is the lower limit setting voltage Vb.
And the upper limit set voltage Va are within the set voltage range, the normal display lamp 20 is judged to be larger or smaller than the set voltage range. Alternatively, the disconnection display lamp 21
Is lit up, it is possible to easily determine whether the bipolar tweezers 4 are normal or whether a disconnection or a short circuit has occurred with the lit lamp.

The present invention is not limited to the embodiments described above and shown in the drawings, and the following modifications and expansions are possible.

The lamp may be turned on only when the detected voltage V0 is within the set voltage range, or may be turned on only when the detected voltage V0 is outside the set voltage range. Further, the notification means is a lamp 19-2.
The number is not limited to 1, and may be, for example, a buzzer or a voice generator.

[0032]

According to the medical coagulation apparatus of the first or second aspect, the output of the high-frequency power source is changed according to the target living tissue and the function of the load circuit, specifically, the function of the bipolar tweezers. In this case, the set voltage range for judging whether the load circuit is normal, disconnected or short-circuited is changed according to the change in the output of the high frequency power supply. Even if there is, it is possible to judge whether the load circuit is normal, disconnected or short-circuited.

Further, according to the medical coagulation apparatus of the third aspect, when the signal is output from the comparing means, the notifying means operates based on this signal, so that whether the load circuit is broken or short-circuited or normal. It can be easily judged by sight or hearing.

[Brief description of the drawings]

FIG. 1 is an electric circuit diagram showing one embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of the entire bipolar coagulation apparatus.

FIG. 3 is a diagram showing the relationship between the detected voltage V0 and the impedance of the load circuit when the output of the high frequency power supply is changed.

[Explanation of symbols]

1 is a bipolar coagulation device (medical coagulation device), 4 is bipolar tweezers, 5 is a high frequency power supply, 6 is an output transformer, 7 is a primary coil, 8 is a variable resistor (output adjusting means), 9 is a secondary coil, 10 Is a detection coil, 11 is a diode (voltage detection means), 12 is a capacitor (voltage detection means), 13 and 14 are comparators (comparison means), 19
Is a short-circuit display lamp (informing means), 20 is a normal display lamp (informing means), 21 is a disconnection display lamp (informing means), and A is a load circuit.

Claims (3)

[Claims] 1. A high frequency power supply, output adjusting means for adjusting the output of the high frequency power supply, a primary coil connected to the high frequency power supply, a secondary coil magnetically coupled to the primary coil, and a detection coil. An output transformer, a load circuit to which high frequency power is supplied from the secondary coil of the output transformer, a voltage detection unit that detects the output voltage of the detection coil of the output transformer, and a voltage value detected by the voltage detection unit. And a comparing means for comparing whether or not the load is within a predetermined setting range, and the comparing means compares the detection voltage by the voltage detecting means with the setting voltage by the output adjusting means. A medical coagulation device characterized in that the state of the circuit is detected in multiple stages. 2. The medical coagulation apparatus according to claim 1, wherein the load circuit includes bipolar tweezers. 3. The medical coagulation apparatus according to claim 1, further comprising an informing unit that operates based on a signal from the comparing unit.