JP4707224B2 - Lesion detection device using puncture needle - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to a lesion detection apparatus using a puncture needle for accurately collecting a tissue of a lesion in a living body.
[0002]
[Prior art]
Conventionally, in the diagnosis of breast cancer, the tissue of a lesioned part is collected with a puncture needle using an ultrasonic diagnostic device, and an image of the lesioned part is displayed on a display device such as a CRT by the reflected wave of the ultrasonic wave irradiated into the body from the ultrasonic transducer. However, the puncture needle displayed on this display device and the position of the lesion are confirmed, but with the current image diagnostic resolution of the ultrasonic diagnostic apparatus, it is difficult to detect the thin puncture needle and the tissue of the minute lesion. Therefore, in the medical field, the doctor senses the resistance that the tip of the puncture needle receives from the lesioned part with the sensation of the hand holding the puncture needle, and confirms the arrival of the tip of the puncture needle into the lesioned part before sucking tissue In order to prevent misdiagnosis, it is important to confirm that the tip of such a puncture needle has surely reached a minute lesion.
[0003]
[Problems to be solved by the invention]
However, since such lesion tissue is harder than normal tissue, it is possible to infer the lesion from the resistance change experienced by the tip of the puncture needle. Since it depends on experience and age, a method for quantitatively detecting a lesion has been desired.
[0004]
[Means to solve the problem]
The present invention relates to a puncture needle for sampling a tissue of a lesioned part, an ultrasonic transducer fixed to the puncture needle, an oscillation device for applying an oscillation output to the ultrasonic transducer, and an oscillation output from the oscillation device. a current detector for detecting a current change, a phase comparator for comparing the phase of the detection current detected by the voltage of the oscillation output of the oscillator device and said current detecting unit, detecting the lesion by the output of the phase comparator The detection unit passes the signal smoothed by the low-pass filter, and inputs the output voltage of the low-pass filter to a voltage controlled oscillator, The output of the voltage controlled oscillator may be amplified by an amplifier and output by an audible sound generator, or the output of the phase comparator may be amplified by an amplifier and displayed by a light emitting device. Amplify the output of the phase comparator with an amplifier. Display in the data may be.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, an ultrasonic transducer is attached to the puncture needle, the puncture needle is ultrasonically vibrated, and a change in the phase of the oscillation output voltage and the oscillation output current input to the ultrasonic transducer is detected. The change can be detected by a change in audible sound, a change in light, or a shake of a meter pointer.
[0006]
【Example】
First, the principle of the present invention will be described before describing the embodiment of the present invention. In FIG. 1, in order to detect the lesioned part 4 in the body of the patient 3 by the puncture needle 1 to which the piezoelectric vibrator 2 is attached, When an oscillation output is applied to the piezoelectric vibrator 2 from the ultrasonic oscillator 5, the mechanical impedance of the vibration system is Z0, the load impedance is Za, the force coefficient of the piezoelectric vibrator 2 is A, and the braking admittance is Yd. A typical equivalent circuit is shown in FIG. 2, and when the lesioned part 4 comes into contact with the tip of the puncture needle 1, the load impedance Za applied to the vibration system changes depending on the hardness of the lesioned part 4. In general, for any vibration system, when the load impedance Za changes, the mechanical resonance frequency f0, the electrical impedance Z, and the phase difference θ change according to the electrical equivalent circuit of FIG. Therefore, it is possible to detect the tissue of the lesioned part 4 of the hard target object from one of these changes.
[0007]
FIG. 3 is a configuration diagram of a puncture needle according to an embodiment of the present invention. A metal disc 6 is fixed to the puncture needle 1 and a disc-shaped piezoelectric vibrator 7 is bonded to the metal disc 6 to thereby form FIG. As shown in FIG. 5, the B10 mode in which one nodal circle of the disc vibrator 7 is bent and vibrated perpendicularly to the surface is used, the bending vibration is converted into the longitudinal vibration, and the puncture needle 1 is excited with the longitudinal vibration. Thus, by causing the puncture needle 1 to vibrate longitudinally, the influence of the mechanical impedance due to the load on the side surface of the puncture needle 1 is reduced, and the mechanical impedance change due to the load at the tip of the puncture needle 1 is greatly affected. is there. As a result, the side surface of the puncture needle 1 is not affected by the tissue in the body of the patient 3, and only the tissue of the lesioned part 4 that contacts the tip of the puncture needle 1 can be accurately detected.
[0008]
FIG. 5 is a block diagram of a lesion detection device using a puncture needle according to an embodiment of the present invention. An oscillation output is applied from an ultrasonic oscillation circuit 8 to a piezoelectric vibrator 7 attached to the puncture needle 1 and a phase comparator 9 is provided. The oscillation output from the ultrasonic oscillation circuit 8 is applied to one of the terminals, and the current detection unit 10 is attached to the output code of the ultrasonic oscillation circuit 8, and the output of the current detection unit 10 is the other of the phase comparator 9. And the phase comparator 9 compares the phase of the oscillation output voltage from the ultrasonic oscillation circuit 8 with the phase of the current output from the current detection unit 10, and uses this phase difference signal as the lesion detection circuit 11. To enter.
[0009]
In the present example configured as described above, when the puncture needle 1 is inserted into the body of the patient 3 in FIG. 1, the piezoelectric vibrator 7 attached to the puncture needle 1 until the tip of the puncture needle 1 contacts the lesioned part 4. Since the phase difference between the oscillation output voltage input from the ultrasonic oscillation circuit 8 and the oscillation output current input to the piezoelectric vibrator 7 is slight, the output of the phase comparator 9 is small, but the tip of the puncture needle 1 Since the phase difference changes greatly when the touches the lesion 4, the output from the phase difference comparator 9 is increased. This output is amplified by the amplifier provided in the lesion detection circuit 11, and the lesion detection is performed. It is possible to detect that the tip of the puncture needle 1 has reached the lesioned part 4 by a large change caused by an audible sound from a speaker provided in the circuit 11, light from a light emitting element, and a shake of a pointer such as a meter.
[0010]
FIG. 6 is a block diagram of a lesion detection apparatus according to another embodiment of the present invention. An ultrasonic oscillator 8 is connected to a transmitter 8a and an amplifier 8b, and an output terminal of the amplifier 8b is a piezoelectric vibrator 7 of the puncture needle 1. And the current detector 10 is connected to the other terminal of the phase comparator 9. The lesion detector 11 includes a low-pass filter 11a, a voltage-controlled oscillator. 11b and an amplifier 11c are sequentially connected, and a speaker 12 is connected to an output terminal of the amplifier 11c.
[0011]
In the lesion detection apparatus of this embodiment configured as described above, when the piezoelectric oscillator 7 is driven by oscillating at the resonance frequency that vibrates in the B10 mode of the piezoelectric vibrator 7 of the disk by the ultrasonic oscillation circuit 8, the piezoelectric vibrator 7 is driven. Since the driving voltage and current of the vibrator 7 are input to the phase comparator 9, the phase difference signal from the phase comparator 9 is smoothed by the low-pass filter 11a, and the audible oscillation frequency of the voltage controlled oscillator 11b is obtained by the DC voltage. The output from the voltage control oscillator 10b is amplified by the amplifier 11c and drives the speaker 12.
[0012]
By using such a lesion detection device, doctors often have their hands and eyes caught during surgery using the puncture needle 1, so that the puncture needle 1 is affected by changes in audible sound from the speaker 12. There is an advantage that it is possible to know exactly whether or not the unit 4 has been reached, and there is no misdiagnosis.
[0013]
In the embodiment of FIG. 6, in addition to the speaker 12, a light emitting element may be connected to detect the change in the light by the light emitting element, or a meter may be connected and the meter pointer shakes. It may be detected.
[0014]
【The invention's effect】
As described above, in the lesion site detection apparatus using a puncture needle of the present invention, an ultrasonic transducer is attached to the puncture needle, the puncture needle is ultrasonically vibrated, and the oscillation output voltage input to the ultrasonic transducer The change in the phase of the current of the oscillation output is detected, and this phase change can be detected by a change in audible sound, by a change in light, or by a shake of a meter pointer. During surgery, there is an advantage that it is possible to know accurately whether the puncture needle has reached the lesion, and there is no misdiagnosis.
[Brief description of the drawings]
FIG. 1 is a diagram for explaining the principle of the present invention.
FIG. 2 is an equivalent circuit diagram for explaining the principle of FIG. 1;
FIG. 3 is a configuration diagram of a puncture needle according to one embodiment of the present invention.
4 is a diagram showing a vibration mode of the puncture needle of FIG. 3. FIG.
FIG. 5 is a block diagram of a lesion detection apparatus using a puncture needle according to an embodiment of the present invention.
FIG. 6 is a block diagram of a lesion detection apparatus according to another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Piezoelectric vibrator 2 Puncture needle 3 Patient 4 Lesion part 5 Ultrasonic transmitter 6 Ultrasonic oscillator 7 Piezoelectric vibrator 8 Ultrasonic oscillation circuit 9 Phase comparator 10 Current detection part 11 Lesion part detection circuit 12 Speaker

Claims (4)

A puncture needle for collecting tissue from a lesion, an ultrasonic transducer fixed to the puncture needle, an oscillation device for applying an oscillation output to the ultrasonic transducer, and a current change in the oscillation output from the oscillation device are detected. a current detection unit which, a phase comparator for comparing the phase of the detection current detected by the voltage of the oscillation output of the oscillation device and the current detection unit, a detecting unit for detecting a lesion by the output of the phase comparator A lesion detection device using a puncture needle, comprising: The detector passes the signal smoothed by the low-pass filter the output of the phase comparator, the inputs of the output voltage of the low-pass filter to the voltage controlled oscillator, amplifying the output of said voltage controlled oscillator by an amplifier The lesioned area detecting device using a puncture needle according to claim 1, wherein the lesioned area is output by an audible sound generator.   2. A lesion detection apparatus using a puncture needle according to claim 1, wherein the output of the phase comparator is amplified by an amplifier and displayed by a light emitting device.   2. A lesion detection apparatus using a puncture needle according to claim 1, wherein the output of the phase comparator is amplified by an amplifier and displayed on a meter.

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