JPH08635A - Medical coagulating device - Google Patents

Abstract

PURPOSE:To provide efficient output in a device having a coagulating function and an incising function. CONSTITUTION:A coagulating secondary coil 22 to generate electric power necessary for coagulation and an incising secondary coil 20 to generate electric power necessary for an incision, are provided on the secondary coil side of an output transformer 17, and are constituted so that a case where electric power is supplied to bipolar tweezers 13 from the coagulating secondary coil 23 and a case where electric power is supplied from the incising secondary coil 20 are switched to/from each other by a changeover switch 23. Thereby, output suitable for coagulation can be obtained appropriately for the coagulation, and output suitable for an incision can be obtained appropriately for the incision.

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 having a coagulation function and an incision function.

[0002]

2. Description of the Related Art A bipolar coagulator, which is a medical coagulator, is a device used for hemostasis in neurosurgery and the like.
Specifically, the bipolar coagulation device connects a pair of electrodes of bipolar tweezers, contacts the pair of electrodes with a tissue (blood vessel) of a living body, and applies a high frequency, for example, a sine wave power of 300 kHz through the pair of electrodes. When applied to the tissue of the living body, Joule heat is generated in the living body to coagulate the tissue and stop the bleeding.

In this type of bipolar coagulator,
In addition to the coagulation function, there is a device that has the function of an electric scalpel that incises the tissue of the living body. The conventional basic electric circuit of this has a structure shown in FIG. In FIG. 5, reference numeral 1 is a high-frequency power source that outputs, for example, 300 kHz sine wave power.
It is connected to the base terminal of. Both collector terminals of these transistors 2 and 2 are connected to both ends of the primary coil 4 of the output transformer 3, and both emitter terminals are grounded.

A capacitor 5 is placed between both terminals of the primary coil 4.
, And the DC power supply terminal 6 is connected to the intermediate tap 4 a of the primary coil 4. The pair of electrodes 8a and 8b of the bipolar tweezers 8 are connected to both ends of the secondary coil 7 of the output transformer 3.

In this structure, a high frequency sine wave power is supplied to the primary coil 4 based on the high frequency power source 1, and an induced voltage is induced in the secondary coil 7 based on the high frequency power. The high frequency sine wave power is supplied to the load (tissue of the living body). In this case, the output can be adjusted by increasing or decreasing the input signal of the high frequency power supply 1 or the voltage from the DC power supply terminal 6.

As shown in FIG. 6, the load characteristics of the above-described structure draw a single-headed curve that is convex upward. The horizontal axis of FIG. 6 represents the load (Ω) when the living body is viewed as resistance on a logarithmic scale, and the vertical axis represents the output (W).

Here, in order to obtain the coagulation function, as described above, the pair of electrodes 8a and 8b are brought into contact with the living body, and Joule heat is generated in the living body to coagulate the tissue, so that the load impedance is set. Is about 150Ω. On the other hand, in order to obtain an incision function (function of an electric knife), one electrode 8a is brought into contact with the living body and the other electrode 8b is contacted.
The load impedance is about 1 kΩ due to the fact that the living body is incised by moving it in a state slightly separated from the living body and generating an arc discharge between them. Conventionally, in order to satisfy both functions of coagulation and incision, the maximum output is obtained at a load impedance of about 500Ω, which is an intermediate value between them.

[0008]

By the way, in the structure described above, the output for obtaining the coagulation function and the output for obtaining the incision function are lower than the maximum output, so that both the coagulation and the incision are performed. In order to obtain the function, it was necessary to set the output under a load of 500Ω to a large output of 50 W to 100 W, which was inefficient.

Therefore, an object of the present invention is to provide a medical coagulation apparatus which has a coagulation function and an incision function and which can obtain an efficient output.

[0010]

In order to achieve the above-mentioned object, the medical coagulation apparatus of the present invention has a high frequency power source, a primary coil to which high frequency power is supplied based on this high frequency power source, and an induced voltage by the primary coil. Output transformer having a secondary coil for coagulation and incision induced, bipolar tweezers, when supplying power from the secondary coil for coagulation to the bipolar tweezers, and power from the secondary coil for incision It is configured to include a switching means for switching between supplying and supplying.

[0011]

According to the above-mentioned means, the secondary coil side of the output transformer is provided with the coagulation secondary coil which generates the electric power required for coagulation and the cutting secondary coil which generates the power required for cutting. By switching between the case where power is supplied from the secondary coil for coagulation to the bipolar tweezers and the case where power is supplied from the secondary coil for incision by the switching means, an output suitable for coagulation for coagulation, and For the incision, an output suitable for the incision can be obtained.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. First, referring to FIG. 2, a bipolar coagulation apparatus 11 which is a medical coagulation apparatus includes a main body 12,
It is composed of a bipolar tweezers 13 having a pair of electrodes 13a and 13b, and its basic electric circuit is shown in FIG.
The configuration is shown in.

In FIG. 1, 14 is, for example, 300 k
A high frequency power source that outputs a sine wave power of Hz, and both terminals thereof are connected to the base terminals of the transistors 15 and 16, respectively. Both collector terminals of these transistors 15 and 16 are connected to both ends of the primary coil 18 of the output transformer 17, and both emitter terminals are grounded. A capacitor 19 is connected between both terminals of the primary coil 18, and a DC power supply terminal 19 is connected to an intermediate tap 18 a of the primary coil 18.

On the secondary side of the output transformer 17, the secondary coil 20 for cutting and the secondary coil 20 for cutting are tapped 2.
And a secondary coil 22 for solidification, which is configured by being electrically separated by 1.

A change-over switch 23, which constitutes a change-over means, is provided between one of the terminals of the incision secondary coil 20 and the tap 21. Of the changeover switch 23, the contact on the tap 21 side is a coagulation contact a, and the contact on one terminal side of the cutting secondary coil 20 is a cutting contact b. Then, the common contact c of the changeover switch 23
And a pair of electrodes 13a, 13b of the bipolar tweezers 13 between the second terminal of the incision secondary coil 20 and the other terminal.
Is connected.

Thus, in the above structure, when the function of solidification is obtained, the changeover switch 23 is brought into a state in which the common contact c and the solidification contact a are closed (see the solid line in FIG. 1). ). In this state, as shown in FIG. 2, when the biological tissue (blood vessel) 24 is sandwiched by the pair of electrodes 13a and 13b of the bipolar tweezers 13, the induced voltage is induced in the secondary coil 22 for coagulation in the output transformer 17 based on the induced voltage. High frequency sinusoidal power is supplied between the pair of electrodes 13a and 13b, which causes Joule heat to be generated in the living tissue 24,
Tissue can be coagulated to stop bleeding. in this case,
The electric power used between the pair of electrodes 13a and 13b is as shown by the characteristic line A in FIG.

On the other hand, in order to obtain the cutting function, the changeover switch 23 is brought into a state in which the common contact c and the cutting contact b are closed (see the chain double-dashed line in FIG. 1). In this state, as shown in FIGS. 3A and 3B, the pair of electrodes 1
Of the electrodes 3a and 13b, one electrode 13a is brought into contact with a living tissue (blood vessel) 24 or a living tissue 24a such as meat,
The other electrode 13b is moved while being slightly separated from the living tissues 24, 24a. Then output transformer 1
High-frequency sinusoidal power is supplied between the pair of electrodes 13a and 13b based on the induced voltage induced in the incision secondary coil 20 in FIG. At this time, the pair of electrodes 13a, 13
A voltage higher than that in the case of coagulation is applied between b, and an arc discharge 25 is generated between the living tissues 24, 24a and the other electrode 13b to cut the living tissues 24, 24a. be able to. In this case, the electric power used between the pair of electrodes 13a and 13b is as shown by the characteristic line B in FIG.

According to the embodiment described above, the output transformer 1
The secondary coil side of No. 7 is provided with a coagulation secondary coil 22 for generating electric power necessary for coagulation and an incision secondary coil 20 for generating electric power necessary for incision.
A pair of electrodes 13 of the bipolar tweezers 13
By switching between the case where electric power is supplied from the coagulation secondary coil 22 to a and 13b and the case where electric power is supplied from the incision secondary coil 20, an output suitable for coagulation can be obtained for coagulation, and an incision can be made. Can obtain an output suitable for incision.

Therefore, in both cases of coagulation and incision, the maximum output is about 20 W, and the maximum output is 50 W.
It is possible to obtain an efficient output, as compared with the conventional one which required ˜100 W.

The present invention is not limited to the above embodiment, but can be modified or expanded as follows. For example, in the above embodiment, a part of the incision coil 20 is used as the coagulation secondary coil 22, but the coagulation secondary coil and the incision secondary coil may be provided exclusively. Further, as the changeover means, a relay may be used instead of the changeover switch 23.

[0021]

As is apparent from the above description, according to the present invention, a secondary coil for coagulation, which generates electric power required for coagulation, and an electric power required for incision, are provided on the secondary coil side of the output transformer. And a secondary coil for incision that generates, by switching between the case where power is supplied from the secondary coil for coagulation to the bipolar tweezers by the switching means, and the case where power is supplied from the secondary coil for incision, An output suitable for coagulation can be obtained for coagulation, and an output suitable for incision can be obtained for incision. Therefore, more efficient output can be obtained as compared with the related art.

[Brief description of drawings]

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

FIG. 2 is an overall schematic configuration diagram.

FIG. 3A is a cross-sectional plan view of a state in which a living tissue (blood vessel) is incised.

FIG. 4 is a diagram showing an output characteristic line.

FIG. 5 is a view corresponding to FIG. 1 showing a conventional example.

FIG. 6 is a view corresponding to FIG.

[Explanation of symbols]

11 is a bipolar coagulator (medical coagulator), 12 is a main body, 13 is bipolar tweezers, 14 is a high frequency power source, 17 is an output transformer, 18 is a primary coil, 20 is a secondary coil for incision, and 22 is a secondary for coagulation. The coil 23 is a changeover switch (changeover means).

Claims (1)

[Claims] 1. A high-frequency power supply, a primary coil to which high-frequency power is supplied based on the high-frequency power supply, an output transformer having a secondary coil for coagulation and incision in which an induced voltage is induced by the primary coil, and bipolar tweezers. And a switching means for switching between the case where electric power is supplied to the bipolar tweezers from the secondary coil for coagulation and the case where electric power is supplied from the secondary coil for incision.