JPH06142064A - Amplifier-built-in type probe for organic diagnosis - Google Patents

Abstract

PURPOSE:To provide an amplifier-built-in type probe for organic diagnosis by allowing reducing of a noise attributed to a cable from a probe and the amplifying of an electrical signal outputted from an impedance head and a load measuring means immediately to improve an S/N ratio. CONSTITUTION:A probe for organic diagnosis is made up at least of a tip chip 6 contacting an organic tissue to be diagnosed, a vibrator 3 to generate vibration with a frequency proportional to the frequency of an input signal, an impedance head 5 which detects acceleration of the vibration of the vibrator 3 and a vibration stress generated in the organic tissue vibrated with the vibrator 3 through the tip chip 6 to generate an electrical signal proportional to them and a load measuring means 4 to measure a contact load between the organic tissue and the impedance head 5 by way of the tip chip 6. This amplifier built-in type probe 2 for organic diagnosis is also provided with amplifiers 8. 9 and 10 to amplify electrical signals to be outputted from the impedance head 5 and the load measuring means 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a biodiagnostic probe which constitutes a part of a measuring device for diagnosing viscoelastic properties (skin hardness, tooth mobility, etc.) of living tissue.

[0002]

2. Description of the Related Art Conventionally, as a bio-diagnosis probe of this type of measuring apparatus, for example, a bio-diagnosis probe of "Machine impedance measuring device for teeth" described in Japanese Patent Laid-Open No. 62-172946 is a tip chip, a random signal generator Of the vibrator driven by the output of the vibrator, the vibration acceleration of the vibrator and the vibration stress generated in the periodontal tissue vibrated by the vibrator through the tip, and the electric signal proportional to them is generated. It consists of an impedance head and a load cell (load measuring means) that measures the static contact load applied to the periodontal tissue.
For example, "Biomedical diagnostic probe using a giant magnetostrictive material" described in Japanese Patent Application No. 3-253037 is a tip chip, an exciter using a giant magnetostrictive material as a core material, an impedance head, and a load measuring means. Was configured.

In such a conventional biopsy probe, an electric signal output from the impedance head or the load measuring means is transmitted via a cable or the like to an amplifier in a data processing unit arranged outside the probe. Was there.

[0004]

However, in the conventional biomedical probe, two signals output from the impedance head (an electrical signal proportional to the acceleration of random vibration and a biological tissue excited by the random vibration) are generated. Since the electric signal proportional to the vibration stress is a charge signal, the noise increases due to the vibration of the cable at the time of measurement, and the output signal from the load cell is a minute signal (voltage signal), so the distance to the amplifier is long. There was a problem that the noise increased.

An object of the present invention is to solve this problem.

[0006]

Therefore, the present invention provides "at least a tip that comes into contact with a living tissue to be diagnosed,
A vibration exciter that generates a vibration having a frequency proportional to the frequency of the input signal, and detects the acceleration of vibration of the vibration exciter and the vibration stress generated in the living tissue excited by the vibration exciter through the tip chip. An impedance head that generates an electrical signal proportional to them, and a load measuring means that measures a contact load between the living tissue and the impedance head through the tip chip, wherein the impedance head and the load are used. There is provided an amplifier built-in type biopsy probe, which is provided with an amplifier for amplifying each electric signal output from the measuring means.

[0007]

Operation: The amplifier built-in type biopsy probe 2 of the present invention
Is a tip 2, a vibrator 3, a load measuring means (for example, a load cell) 4, an impedance head 5 in the probe 2.
In addition to the above, amplifiers 8, 9 and 10 are built in and integrated. The random frequency signal output from the random signal generator 1 outside the probe 2 is input to the vibrator 3 in the probe 2, and the vibrator 3 generates vibration of a random frequency proportional to the input frequency. This vibration excites the living tissue to be diagnosed via the load measuring means 4, the impedance head 5, and the tip 6.

The impedance head 5 measures the acceleration of the vibration of the random frequency and the vibration stress generated in the vibrated living tissue, and outputs an electric (charge) signal proportional to them. These charge signals are converted into voltage signals by the two charge amplifiers 8 and 9 built in the probe 2, and then input to the data processing unit 11 outside the probe 2, and based on these signals, the viscosity of the biological tissue is detected. Diagnose elastic properties.

The diagnosis result of the viscoelastic property of the living tissue is
Since it depends on the value of the static contact load between the living tissue and the probe 2, it is necessary to make the diagnosis with the contact load kept constant by monitoring the output of the load measuring means 4 for measuring the contact load. At this time, the signal (voltage signal) from the load measuring means 4 is amplified by the load measuring means amplifier 10 built in the probe 2 and then input to the data processing section 11 to monitor its output.

Since the electric signal after passing through the charge amplifiers 8 and 9 becomes a voltage signal, the cable 12 coming out from the probe 2 does not contain a charge signal, and noise is reduced. Further, the impedance head 5 and the load measuring means 4 are connected to the amplifiers 8, 9,
The distance to 10 is shortened, and the electrical signals output from the impedance head 5 and the load measuring means 4 are immediately amplified, so that the S / N ratio is improved.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited thereto.

[0012]

FIG. 1 is a schematic diagram showing an amplifier built-in type living body diagnostic probe 2, a random signal generator 1 and a data processing section 11 of an embodiment. The random frequency signal output from the random signal generator 1 was input to the vibrator 3 in the probe 2, and the vibrator 3 generated vibration of a random frequency proportional to the input frequency. This vibration vibrates a living tissue (not shown) through the load cell (an example of load measuring means) 4, the impedance head 5, and the tip 6.

The impedance head 5 measures the acceleration of the vibration of the random frequency and the vibration stress generated in the vibrated living tissue, and outputs an electric (charge) signal proportional to them. These charge signals were converted into voltage signals by the charge amplifiers 8 and 9 incorporated in the case 7, and then input to the data processing unit 11 to diagnose the viscoelastic characteristics of the living tissue based on these signals.

The diagnostic result of the viscoelastic property of the living tissue is
Since it depends on the value of the static contact load between the living tissue and the probe 2, the contact load was kept constant by diagnosing the output by monitoring the output of the load cell 4 for measuring the contact load. At this time, the signal (voltage signal) from the load cell 4 is
After amplification by the load cell amplifier 10 incorporated in the case 7, the data was input to the data processing unit 11 and its output was monitored.

In the diagnosis of the viscoelastic property of the living tissue carried out in this way, the noise due to the cable 12 coming out from the probe 2 is reduced, and the electric signal outputted from the impedance head 5 and the load cell 4 is immediately amplified and S / N
The ratio has improved.

[0016]

As described above, the amplifier built-in type biopsy probe 2 of the present invention has the amplifiers 8, 9 and 10 built therein, and the cable 12 coming out of the probe 2 does not contain a charge signal. Therefore, noise is reduced, and the electric signals output from the impedance head 5 and the load measuring means 4 are immediately amplified, so that the S / N ratio is improved.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an amplifier built-in type biopsy probe 2, a random signal generator 1, and a data processing unit 11 of an embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Random signal generator 2 ... Probe 3 ... Vibrator 4 ... Load cell (an example of load measuring means) 5 ... Impedance head 6 ... Tip chip 7 ... Case 8 ... Charge amplifier 9 ... Charge amplifier 10 ... Amplifier for load cell (load measuring means) 11 ... Data processing unit 12 ... Cable

Claims (1)

[Claims] 1. A tip chip contacting at least a living body tissue to be diagnosed, a vibrator for generating a vibration having a frequency proportional to a frequency of an input signal, an acceleration of vibration of the vibrator and the vibration applied through the tip chip. An impedance head that detects a vibration stress generated in the living tissue vibrated by a shaker and generates an electric signal proportional thereto, and measures a contact load between the living tissue and the impedance head through the tip tip. In the biomedical probe including the load measuring means, an amplifier built-in type biometric probe is provided, which is provided with an amplifier that amplifies each of the electric signals output from the impedance head and the load measuring means.