JPH0728509U - Stethoscope - Google Patents

Abstract

(57) [Summary] [Purpose] To eliminate the problems of conventional stethoscopes caused by the presence of rubber tubes. [Structure] The sound detector 1 and the sound detector 2 are configured separately.
The sound detector 1 is provided with a transmitter 1a for carrying out an arbitrary modulation by adding the internal sound information detected by the microphone 16 to the electric vibration from the oscillator 11 and amplifying and radiating the information. 2 is a receiver 2 that demodulates the received radio wave to extract body sound information, amplifies and outputs as sound.
It is equipped with a.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a stethoscope in which a phonometer and a hearing aid are in wireless communication.

[Prior art]

In a conventional stethoscope, a rubber tube or the like is used to connect between a sound detector that is directed to the body of the stethoscope and a sound detector that is directed to the ear of the stethoscope, and the pick-up device picks up the sound. I was listening to the sound through the rubber tube directly from the hearing aid.

[0003]

[Problems to be solved by the device]

 However, in the stethoscope described above, the rubber tube that connects the phonoscope and the hearing instrument may be an obstacle during auscultation, and depending on the length of the rubber tube, the examinee may Since the distance between the patient and the stethoscope is limited, it may be inconvenient for medical treatment of large animals.

It is an object of the present invention to eliminate the problems of the conventional stethoscope caused by the presence of the rubber tube.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the stethoscope of the present invention separates a sound detector that detects the internal sound toward the body of the patient and a hearing device that corresponds to the ear of the patient. The internal sound information detected by the microphone is added to the electric vibration output from the oscillating unit in the sound detector described above to perform arbitrary modulation, and then this modulated wave is amplified and emitted. In addition to being equipped with a transmitter, the hearing aid is equipped with a receiver that demodulates the received modulated wave from the transmitter, extracts internal body sound information, amplifies it, and outputs it as sound.

[0006]

According to the above-mentioned means, the body sound obtained by directing the sound detector to the body of the person to be examined is the signal wave of the body sound information on the carrier wave by the transmitter included in the sound detector. Is added, this modulated wave is amplified and emitted as a radio wave. On the other hand, the receiver included in the audio receiver that is addressed to the ears of the stethoscope receives the radio waves sent from the transmitter as described above and demodulates the modulated wave, thereby transmitting the internal sound information on the carrier wave. Is taken out, further amplified and output as a sound.

[0007]

[Effect of device]

 As described above, the present invention radiates the body sound obtained by the sound detector as a radio wave by the transmitter, receives it by the receiver of the hearing aid, and outputs it as the body sound. , The wireless connection between the sound detector and the hearing aid eliminates the inconvenience of use, such as the obstruction of the rubber tube as in conventional stethoscopes and the limitation of the distance between the stethoscope and the stethoscope. can do.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. The stethoscope a shown in FIG. 1 is composed of a sound detector 1 directed to the body of the stethoscope and a sound detector 2 attached to the ear of the stethoscope, and the internal sound detected by the sound detector 1 is detected. Is transmitted as a radio wave by the transmitter 1a included in the sound detector 1, and the radio wave is received by the receiver 2a of the hearing aid 2 and reproduced as an internal sound.

As shown in the block diagram of FIG. 3, the sound detector 1 includes a crystal oscillator 11, an FM modulator 12, a multiplication and output amplifier 13, in addition to a power source 15 including a microphone 16 and a lithium battery. The transmitter 1a including the transmitting antenna 14 is provided.

As shown in FIG. 2, the sound detector 1 configured as described above has a transmitter body 1 a and a lithium battery 15 with a switch 17 built into a circular main body case 10, and the same case. 10 A structure is adopted in which a piezo element 16 (microphone) sandwiched between a resonance plate 18 and an interference rubber plate 19 is fitted in the front surface portion. The piezo element 16 described above is originally used as a vibration detection device, but by using it as a microphone as described above, it is possible to clearly detect the sound inside the body.

On the other hand, the listening device 2 includes a receiving antenna 21, an FM receiver 22, a detection circuit 23, a Bachfa amplifier 24, a filter circuit 25, and a receiver 2 a including an audio output amplifier 26, together with an earphone 27. . The filter circuit 25 includes four types of filters having different characteristics, that is, FRAT25a, LPF25b, HPF25c, and BPF25d, and is configured so that any one of the above filters can be switched by the filter switching selection electronic switch 28. is there.

As shown in FIG. 1, the sound hearing device 2 having the above-described configuration is configured such that two sound transmission pipes 28 on the left and right sides are extended from a case 20 having a transmitter 2a built therein, and earphones 27 are provided at the tip ends thereof. I am doing it. The sound transmission tube 28 also serves as the reception antenna 21. Next, the operation of the stethoscope a configured as described above will be described. The stethoscope puts the earphone 27 of the hearing aid 2 into the ear with the earphone 27 lowered from the neck, and at the same time, while pushing the switch 17 of the sound detector 1, the front of the sound detector 1 is directed to the body of the stethoscope. And conduct an auscultation. If the sound detector 1 can be turned on / off by the switch 17 as described above, unnecessary sound detection can be avoided and wasteful consumption of the power supply battery 15 can be prevented.

As shown in FIG. 3, when the switch 17 of the sound detector 1 is pressed, the battery 15 serving as a power source applies the voltage to the transmitter 1 a, and the crystal oscillator 11 causes electric vibration of a predetermined frequency, that is, The carrier wave is output to the FM modulator 12. The FM modulator 12 puts the internal sound information of the patient, that is, the signal wave, obtained from the microphone 16 by frequency modulation, on the carrier wave. The multiplication and output amplifier 13 multiplies the modulated wave that has been modulated, amplifies it, and radiates it as a radio wave from the transmission antenna 14. The radio waves transmitted from the transmitter 1a are weak radio waves and have almost no influence on surrounding devices.

The receiver 2 a of the hearing aid 2 amplifies the radio wave received by the FM receiver 22 via the receiving antenna 21, and then demodulates the modulated wave by the detection circuit 23 to put the signal wave on the carrier wave. That is, the body sound information is taken out, amplified by the buffer amplifier 24, and then passed through the filter circuit 25.

The filter circuit 25 removes noise or the like from only the sound in the target frequency range from the voice information and passes the sound. As described above, four types of filters having different characteristics depending on the application, the FRAT 25a and the LPF 25b. , HPF 25c, and BPF25d, which are used by switching from among the respective filters by operating the filter switching selection electronic switch 28.

More specifically, the FRAT 25a exhibits a flat characteristic from about 10 Hz to 3 KHz, and can faithfully transmit an acoustic signal in this range (FIG. 4). The LPF 25b passes only a low frequency that tightens most of the vibration frequency band of the heart sound in the range of about 10 Hz to 100 Hz, and it is possible to hear even if there is some obstacle in the meantime (Fig. 5). ). The HPF 25c is for further use in the range of about 300 Hz to 5 KHz, for example, breath sounds, and relatively high sounds can be clearly heard (FIG. 6). Since the BPF 25d clearly hears a specific vibration sound, the frequency range can be freely selected within a narrow range (FIG. 7). By selecting and using each of the above filters 25a to 25d according to the purpose, a wide range of frequencies shown in FIG. 7 can be covered, noise and unnecessary sounds can be reduced, and a large S / N ratio can be obtained. Sound can be output as faithfully as possible.

The signal passed through the filter circuit 25 is then amplified by the power amplifier 26 and output from the earphone 17 as a body sound. It should be noted that the above-mentioned sound detector 2 may use a plurality of sound detectors 2 for one sound detector 1, and in this case, the radio waves transmitted from one sound detector 1 are detected by a plurality of sound detectors. A plurality of stethoscopes can receive the same at the same time by receiving with the device 2.

An external output terminal 35 for connecting a plurality of devices is drawn from the power amplifier 26. For example, by connecting an oscilloscope, a recorder, or other equipment to the terminal 35, it is possible to perform auscultation by the hearing aid 2 and monitoring by the equipment at the same time.

Further, a changeover switch 29 is provided on the secondary side of the detection circuit 23, and is connected to the wired stethoscope 30 from the changeover switch 29 via a wired line 33. Therefore, by switching the change-over switch 29, body sound information heard by the microphone 32 of the wired stethoscope 30 is amplified by the amplifier 31 separately from the stethoscope 1 that uses radio waves, and then the sound of the stethoscope 2 is detected. It is also possible to perform auscultation from the earphone 27 using a circuit after the buffer amplifier 24.

Furthermore, during surgery on animals such as livestock, it is possible to attach an adapter such as a catheter to a sound detector to transmit sound from the inside of the body and perform auscultation with the sound detector 2.

[Brief description of drawings]

FIG. 1 is a perspective view showing a stethoscope embodying the present invention.

FIG. 2 is a longitudinal sectional view showing a sound detector of the stethoscope.

FIG. 3 is a block diagram showing the configuration of a stethoscope.

FIG. 4 is a characteristic graph of a FLAT filter.

FIG. 5 is a characteristic graph of an LPG filter.

FIG. 6 is a characteristic graph of an HPF filter.

FIG. 7 is a characteristic graph of each filter.

[Explanation of symbols]

 a ... Stethoscope 1 ... Sound detector 1a ... Transmitter 16 ... Microphone 2 ... Hearing instrument 2a ... Receiver 25 ... Filter 27 ... Earphone

Claims (1)

[Scope of utility model registration request] 1. A sound detector for detecting a body sound directed to the body of a stethoscope and a sound detector directed to the ear of a stethoscope are separately configured, and the sound detector includes: After the internal sound information detected by the microphone is placed on the electric vibration output from the oscillating unit to perform arbitrary modulation, a transmitter that amplifies and radiates this modulated wave is provided, and the hearing aid is A stethoscope equipped with a receiver that demodulates the received modulated wave from the transmitter, extracts internal body sound information, amplifies it, and outputs it as sound.