JPH0578208U - Ultrasonic surgical instrument - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a supersonic surgical instrument that, when crushing or excising hard tissue such as skull or spinal cord, does not damage the soft tissue behind the tissue after penetrating the tissue. .. [Structure] An oscillation circuit 17 for outputting an ultrasonic signal, an ultrasonic transducer 19, a horn 20, and an AGC voltage generation circuit 2
2, a load detection circuit 24, a control circuit 26, and a restart switch 28. When the horn 20 penetrates bone tissue and the load applied to the horn 20 is suddenly reduced, the load detection circuit 24, The ultrasonic oscillation is stopped by the control circuit 26, and the oscillation cannot be restarted unless the restart switch 28 is used.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an ultrasonic surgical instrument for crushing or excising tissue by ultrasonic vibration.

[0002]

[Prior Art]

 Conventionally, an ultrasonic surgical instrument that crushes or excises tissue by ultrasonic vibration has been used.

Generally, an ultrasonic surgical instrument includes an oscillating circuit that generates an ultrasonic signal and a handpiece that outputs ultrasonic vibration to the outside. In such a surgical instrument, an electric signal generated by the oscillation circuit is supplied to the transducer inside the handpiece, and ultrasonic vibration is emitted from the tip of the horn connected to the transducer to contact the tissue. Therefore, the tissue is crushed or excised.

When crushing or excising tissue, the ultrasonic vibration fluctuates due to the load fluctuation of the horn due to the change of the living tissue. A device having a stabilizing circuit that corrects this fluctuation and outputs a stable ultrasonic vibration, or a display device that displays a change in load and informs the operator of the surgical condition, as described in Japanese Utility Model Publication No. 3-85011. Some have.

[0005]

[Problems to be solved by the device]

 However, according to the configuration of the conventional technology, when crushing or excising hard tissues such as the skull and spinal cord, when the bone tissue is penetrated and the handpiece is advanced as it is, the load changes rapidly, but the horn As it continues to vibrate, it can damage the soft nerve tissue and blood vessels behind the bone tissue. Therefore, in order to prevent damage, the handpiece was slowly advanced and the penetration of bone tissue was judged by the operator's intuition and experience, and the ultrasonic vibration was stopped by himself.

[0006] Therefore, the present invention provides an ultrasonic surgical instrument which, when crushing or excising hard tissue such as skull or spinal cord, does not damage the soft tissue on the back side of the tissue after penetrating the tissue. The purpose is to do.

[0007]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention provides a handpiece whose tip vibrates ultrasonically for crushing or excising living tissue, and an oscillation circuit which supplies an oscillation signal to the handpiece and vibrates the handpiece ultrasonically. An AGC voltage generating circuit that supplies a control signal corresponding to the load fluctuation to the oscillation circuit when the load fluctuation occurs in the handpiece to stabilize the ultrasonic vibration that is the output of the handpiece. In a surgical instrument, a load detection circuit that detects a sudden load change and outputs a load detection signal when the load is suddenly reduced, and a control circuit that receives the load detection signal and outputs an oscillation stop signal to the oscillation circuit And a restart switch for restarting the oscillation stopped by the oscillation stop signal.

[0008]

[Action]

 In the ultrasonic surgical instrument of the present invention, when the load fluctuation due to the ultrasonic vibration generated from the tip of the horn suddenly occurs, the load detection signal is received, the oscillation stop signal is output from the control circuit, and the ultrasonic vibration is immediately generated. To stop. That is, when crushing or excising hard tissues such as the skull and spinal cord, stop ultrasonic vibration immediately after penetrating the bone tissues.

[0009] Therefore, it is possible to preserve the soft blood vessels and nerves existing on the back side of the bone tissue without damaging them, and it is possible to perform crushing or excision of the hard tissue. Ultrasonic vibration can be restarted by the activation switch, which enables safer and faster surgery.

[0010]

【Example】

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

As shown in FIG. 1, the ultrasonic surgical instrument of the present invention is provided with an oscillation circuit 17 including a filter circuit 10, an AGC circuit 12, a power amplification circuit 14, and a vibration detection circuit 16.

A horn 20 is connected to the vibration detection circuit 16 via an ultrasonic transducer 19. Further, the ultrasonic transducer 19 and the horn 20 form a handpiece 18.

The vibration detection circuit 16 is further connected to the filter circuit 10 to form a feedback circuit.

That is, when a predetermined oscillation signal is generated by the oscillation circuit 17, the oscillation signal is supplied to the ultrasonic transducer 19. In the ultrasonic oscillator 19, ultrasonic vibrations are emitted from the horn 20 connected to the tip thereof in accordance with the supplied oscillation signal, and the ultrasonic vibrations are supplied to the living tissue or the like to crush the living tissue. To do.

When the contact state between the horn 20 and the living tissue changes, for example, when the horn 20 crushes hard tissue such as a skull or spinal cord, ultrasonic waves emitted from the tip of the horn 20. The vibration amplitude fluctuates to some extent. The information on the amplitude variation of the ultrasonic vibration is superimposed on the feedback voltage for generating the oscillation signal and input to the filter circuit 10 to form a stable oscillation circuit as a whole.

Further, an AGC voltage generation circuit 22 is connected to the vibration detection circuit 16 together with the filter circuit 10, and the AGC voltage generation circuit 22 is further connected to the AGC circuit 12 and the load detection circuit 24. There is.

The AGC voltage generation circuit 22 is a circuit that outputs a control signal to the AGC circuit 12 and the load detection circuit 24 in response to a signal from the vibration detection circuit 16. The load detection circuit 24 is supplied with an output setting voltage and an AGC voltage and is output to the control circuit 26. In the AGC circuit 12, the amplification gain related to the generation of the oscillation signal is controlled based on the AGC voltage supplied from the AGC voltage generation circuit 22.

On the other hand, the amplitude fluctuation of the ultrasonic vibration related to the output of the horn 20 is detected by the vibration detection circuit 16, the information related to the fluctuation is supplied to the feedback circuit, and further to the AGC voltage generation circuit 22. Is also input, the AGC voltage changed based on the information of the feedback voltage is supplied to the AGC circuit 12. At this time, in the AGC circuit 12, the amplification gain related to the generation of the oscillation signal is controlled so as to stabilize the ultrasonic vibration which is the output of the horn 20.

A feature of the present invention is that the output control unit 27 is provided in the above configuration.

As shown in FIG. 1, the output control section 27 includes a load detection circuit 24, a control circuit 26, and a restart switch 28.

The load detection circuit 24 takes in the AGC voltage which is the output of the AGC voltage generation circuit 22, detects the load change related to the ultrasonic vibration emitted from the tip of the horn 20, and detects the load. The detected voltage is output to the control circuit 26. Here, since the AGC signal output from the AGC voltage generating circuit 22 is a DC signal, control is easy.

The control circuit 26 outputs an oscillation stop signal to the AGC circuit 12 in response to a change in the load detection voltage.

For example, when the load applied to the tip portion of the horn 20 is sharply reduced, that is, it penetrates through hard tissue, and when the load is sharply reduced, the AGC voltage output from the AGC voltage generating circuit 22 is output. Rises sharply. This sudden change is detected by the load detection circuit 24, an oscillation stop signal is output from the control circuit 26 to the AGC circuit 12, and the horn 20 stops the output of ultrasonic vibration.

Further, when the ultrasonic vibration is further required, the oscillation can be restarted by the restart switch 28 such as a foot switch connected to the control circuit 26.

[0025]

[Effect of the device]

 The present invention is configured as described above, and when crushing or excising hard tissue such as skull and spinal cord by ultrasonic vibration at the tip of the horn, ultrasonic vibration can be stopped immediately after penetrating the bone tissue. it can.

Therefore, it is possible to crush or excise hard tissue without damaging soft blood vessels, nerves, etc. existing on the back side of bone tissue, and it is possible to make surgery safer and faster.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention.

[Explanation of symbols]

 17 Oscillation Circuit 18 Handpiece 19 Ultrasonic Transducer 22 AGC Voltage Generation Circuit 24 Load Detection Circuit 26 Control Circuit 28 Restart Switch

Claims (1)

[Scope of utility model registration request] 1. A handpiece, the tip of which vibrates ultrasonically for crushing or excision of biological tissue, an oscillation circuit which supplies an oscillation signal to the handpiece and vibrates the handpiece ultrasonically, and a load on the handpiece. When a fluctuation occurs, an AGC voltage generating circuit that supplies a control signal corresponding to this load fluctuation to the oscillation circuit to stabilize the ultrasonic vibration that is the output of the handpiece, A load detection circuit that detects this sudden load change and outputs a load detection signal when abruptly reduced, a control circuit that receives the load detection signal and outputs an oscillation stop signal to the oscillation circuit, and the oscillation stop signal An ultrasonic surgical instrument, comprising: a restart switch that restarts oscillation that has been stopped by.