JPH05220159A - Ultrasonic surgical operating device - Google Patents

Abstract

PURPOSE:To further improve the safety by making an output amplitude value small in accordance with a load in a prescribed load value or above. CONSTITUTION:The device is provided with an output detecting circuit 22 for detecting a variation in output amplitude from an output circuit 18 for supplying electric power to an ultrasonic vibrator 20, and a load detecting circuit 32 for detecting a load state by the variation in output amplitude detected by the output detecting circuit 22. Accordingly, in the case the load detecting circuit 32 detects a fact that magnitude of a load exceeds a prescribed value X, an output control circuit 14 controls an output so as to become output amplitude being in inverse proportion to the magnitude of the load. Also, in the case the magnitude of the load exceeds a prescribed value Y, the output control circuit 14 controls an output so that the output amplitude becomes the lower limit value, and this amplitude lower limit value is held to a load limit Z.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic surgical instrument which is used in surgery and the like, and which is equipped with an ultrasonic transducer and a surgical instrument for ultrasonic crushing and emulsifying.

[0002]

2. Description of the Related Art Conventionally, there is known an ultrasonic surgical instrument equipped with an ultrasonic vibrator and a surgical instrument for ultrasonically crushing and emulsifying.

As shown in FIG. 4, this ultrasonic surgical instrument 10 has an oscillation circuit 12 for outputting an oscillation signal, and an output control circuit 14 for controlling the output is connected to the oscillation circuit 12. . A power amplifier circuit 16 is connected to the output control circuit 14, and an output circuit 18 is connected to the power amplifier circuit 16. Further, in the output circuit 18,
An ultrasonic transducer 20 that generates ultrasonic vibration, and an output detection circuit 22 that detects the output amplitude of the output circuit 18 and feeds it back to the oscillation circuit 12 and the output control circuit 14 are connected.

The ultrasonic transducer 20 is, as shown in FIG.
A surgical instrument (horn) 28, which is disposed inside an outer cylinder 26 that constitutes the handpiece 24, is used to crush the affected tissue by the ultrasonic vibration generated by the ultrasonic vibrator 20. Has been done. Reference numeral 30 is a code for supplying electric power to the ultrasonic transducer 20.

Next, the operation will be described. Oscillator circuit 12
The output control circuit 14 controls the amplitude of the ultrasonic vibration to a preset set value by the feedback from the output detection circuit 22, and as shown by a broken line 100 in FIG. Does not change,
In other words, the higher the load, the larger the electric power supplied to the ultrasonic transducer 20 is controlled. Then, the output of the output control circuit 14 is amplified by the power amplification circuit 16 and supplied from the output circuit 18 to the ultrasonic transducer 20, and the ultrasonic transducer 20 generates ultrasonic vibration by this power. Then, the ultrasonic vibration of the ultrasonic transducer 20 is transmitted to the surgical instrument 28, and the surgical instrument 28 crushes the affected tissue.

[0006]

Since the conventional ultrasonic surgical instrument is constructed as described above, the fact that a load is applied means that the surgical instrument 28 is in contact with the affected part to perform crushing. And a state in which the surgical tool 28 is strongly pressed against the affected area more than necessary, or the side surface of the surgical tool 28 is in contact with living tissue other than the affected area and damages the living tissue, including improper use. There is a problem that a large amount of power is supplied to the ultrasonic transducer 20 with respect to an increase in load regardless of the operating state.

The present invention has been made in order to solve the above problems, and an ultrasonic surgical instrument which can improve the safety by reducing the output amplitude value according to the load at a predetermined load value or more. It is intended to be provided.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an ultrasonic surgical instrument according to the present invention is an ultrasonic vibrator for generating ultrasonic vibration, and an ultrasonic vibrator. Connected to the surgical instrument for crushing the affected tissue by the generated ultrasonic vibration, power supply means for supplying electric power to the ultrasonic vibrator, and load condition by detecting the change in the output amplitude from the power supply means. And a load detection circuit for detecting. Therefore, the power supply means is characterized in that when a load equal to or larger than a predetermined value is applied to the surgical instrument, the output control is performed so that the output amplitude becomes a predetermined output amplitude according to the magnitude of the load.

[0009]

Based on the above configuration, the ultrasonic surgical instrument according to the present invention supplies electric power to the ultrasonic vibrator from the electric power supply means,
The ultrasonic vibration is generated by the ultrasonic vibrator, and the affected tissue is crushed by the surgical instrument that transmits the ultrasonic vibration generated by the ultrasonic vibrator to perform the surgery. Then, the load state is detected by the load detection circuit by detecting the change in the output amplitude from the power supply means, and when the load of a predetermined value or more is applied to the surgical instrument by the power supply means, the load level is determined. The output amplitude is controlled according to the predetermined output amplitude.

[0010]

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

FIG. 1 is a block diagram showing the configuration of an ultrasonic surgical instrument according to the present invention.

The ultrasonic surgical instrument 10 has an oscillation circuit 12 that outputs an oscillation signal, and an output control circuit 14 that controls the output is connected to the oscillation circuit 12. A power amplifier circuit 16 is connected to the output control circuit 14, and an output circuit 18 is connected to the power amplifier circuit 16. Further, the output circuit 18 is connected with an ultrasonic transducer 20 that vibrates ultrasonically, and an output detection circuit 22 that detects the output amplitude of the output circuit 18 and feeds it back to the oscillation circuit 12 and the output control circuit 14. The oscillation circuit 12, the output control circuit 14, the power amplification circuit 16, and the output circuit 18 constitute power supply means.

Further, the output detection circuit 22 is connected to a load detection circuit 32 which detects a load state based on a change in output amplitude detected by the output detection circuit 22, and the output of the load detection circuit 32 is the output control circuit 14. Feedback to
The output control circuit 14 controls the output so that when a load of a predetermined value or more is applied to the surgical instrument 28, the output amplitude becomes a predetermined output amplitude according to the magnitude of the load.

The ultrasonic transducer 20 is, as shown in FIG.
It is arranged in an outer cylinder 26 that constitutes the handpiece 24, and a surgical instrument 28 that crushes the affected tissue by the ultrasonic vibration generated by the ultrasonic vibrator 20 is connected to the ultrasonic vibrator 20. . The reference numeral 30 indicates an ultrasonic transducer 20.
It is a code for supplying power to.

Next, the operation will be described.

The oscillation circuit 12 and the output control circuit 14 control the amplitude of the ultrasonic vibration to a preset value by feedback from the output detection circuit 22 within a range where the load does not exceed the predetermined value X, As indicated by the solid line 101 in FIG. 2, control is performed so that the output amplitude does not vary depending on the size of the load, that is, the larger the load, the more power is supplied to the ultrasonic transducer 20. Then, the output of the output control circuit 14 is amplified by the power amplification circuit 16,
The ultrasonic oscillator 20 is supplied from the output circuit 18 to the ultrasonic oscillator 20, and the ultrasonic oscillator 20 is ultrasonically vibrated by this electric power. Then, the ultrasonic vibration of the ultrasonic transducer 20 is transmitted to the surgical instrument 28, and the surgical instrument 28 crushes the affected tissue.

Next, when the load detection circuit 32 detects that the magnitude of the load exceeds the predetermined value X, the output control circuit 1
4 controls the output so that the output amplitude is inversely proportional to the magnitude of the load. Further, when the magnitude of the load exceeds the predetermined value Y, the output control circuit 14 performs output control so that the output amplitude becomes the lower limit value, and holds this amplitude lower limit value up to the load limit Z. As a result, the output characteristic becomes as shown by the solid line 101 in FIG.

In the above-described embodiment, when the load magnitude exceeds the predetermined value X, the output amplitude is inversely proportional to the load magnitude. It may be changed according to an exponential curve or an arbitrary curve.

[0019]

As described above, according to the present invention,
The load state is detected by the load detection circuit by detecting a change in the output amplitude from the power supply means, and when the load of a predetermined value or more is applied to the surgical instrument by the power supply means,
Since it is configured to control so as to have a predetermined output amplitude according to the magnitude of the load, for example, the surgical instrument is pressed against the affected area more than necessary, or the side surface of the surgical instrument contacts the living tissue other than the affected area. If the load increases above a specified value due to improper usage such as damage to the living tissue, the power supplied to the ultrasonic transducer is reduced, which can further improve safety. it can.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an ultrasonic surgical instrument according to the present invention.

FIG. 2 is a diagram showing output characteristics of the ultrasonic surgical instrument according to the present invention.

FIG. 3 is a schematic view showing a general handpiece.

FIG. 4 is a block diagram showing a configuration of a conventional ultrasonic surgical instrument.

[Explanation of symbols]

 10 Ultrasonic Surgery Device 12 Oscillation Circuit 14 Output Control Circuit 16 Power Amplification Circuit 18 Output Circuit 20 Ultrasonic Transducer 22 Output Detection Circuit 28 Surgical Instrument (Horn) 32 Load Detection Circuit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masashi Tanaka 2-10-19 Tairiri, Ueda-shi, Nagano Ueda Japan Radio Co., Ltd.

Claims (1)

[Claims] 1. An ultrasonic vibrator for generating ultrasonic vibration, a surgical instrument connected to the ultrasonic vibrator for crushing affected tissue by the ultrasonic vibration generated, and electric power for supplying electric power to the ultrasonic vibrator. And a load detection circuit that detects a load state by detecting a change in output amplitude from the power supply unit, wherein the power supply unit is a surgical instrument when a load of a predetermined value or more is applied, An ultrasonic surgical instrument, characterized in that the output is controlled so as to have a predetermined output amplitude according to the magnitude of the load.