CN219501040U - Bluetooth stethoscope - Google Patents
Bluetooth stethoscope Download PDFInfo
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- CN219501040U CN219501040U CN202320197110.6U CN202320197110U CN219501040U CN 219501040 U CN219501040 U CN 219501040U CN 202320197110 U CN202320197110 U CN 202320197110U CN 219501040 U CN219501040 U CN 219501040U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The utility model discloses a Bluetooth stethoscope, which comprises a Bluetooth unit, an amplifying and filtering unit, a main control unit and a pickup unit, wherein the amplifying and filtering unit is arranged on the Bluetooth unit; the signal output end of the pickup unit is connected with the signal input end of the amplifying and filtering unit; the signal output end of the amplifying and filtering unit is connected with the signal input end of the noise reduction module in the main control unit, the signal output end of the noise reduction module in the main control unit is connected with the signal input end of the analog-to-digital conversion module of the main control unit, and the signal output end of the analog-to-digital conversion module in the main control unit is connected with the signal input end of the storage device through the Bluetooth unit. Compared with the traditional stethoscope, the Bluetooth stethoscope disclosed by the utility model has the advantages that the collected sound signals are subjected to efficient filtering and noise reduction treatment, the noise in the environment can be effectively filtered, and the collected sound data can be stored and analyzed.
Description
Technical Field
The utility model relates to an auxiliary medical diagnosis device mainly used for heart, respiratory system diseases and the like, in particular to a Bluetooth stethoscope.
Background
In a medical system, a stethoscope is an acoustic medical instrument commonly used for auscultating the internal sound of a patient, and is one of important bases for doctors to diagnose heart system diseases and respiratory system diseases of the patient. The traditional stethoscope mostly adopts a receiver type structure for transmitting sound by a metal catheter, and the stethoscope with the structure has the following defects in actual operation although the structure is simple, the sound transmission is direct and the use is convenient: the inability to correlate sound signals results in a traditional stethoscope that may not accurately discriminate sounds in noisy environments, and that may not analyze and preserve sound data, thereby resulting in a failure to correlate and trace back the patient's condition in some situations.
Disclosure of Invention
The utility model aims to provide a Bluetooth stethoscope which can filter noise and save sound data by processing sound signals so as to be beneficial to improving the accuracy of auscultation results.
In order to achieve the above purpose, the Bluetooth stethoscope comprises a Bluetooth unit, an amplifying and filtering unit, a main control unit and a pickup unit, wherein the signal output end of the pickup unit is connected with the signal input end of the amplifying and filtering unit, the signal output end of the amplifying and filtering unit is connected with the signal input end of a noise reduction module in the main control unit, the signal output end of the noise reduction module in the main control unit is connected with the signal input end of an analog-to-digital conversion module in the main control unit, and the signal output end of the analog-to-digital conversion module in the main control unit is connected with the signal input end of a storage device through the Bluetooth unit.
Because the signal output by the pickup unit is relatively weak, the requirement of subsequent filtering cannot be met, the signal must be amplified, and a multi-stage amplifying circuit with high amplification factor, high input impedance and low output impedance must be provided. Therefore, the further technical scheme is as follows: the amplifying and filtering unit comprises an amplifying circuit and a low-pass filtering and amplifying circuit, the signal output end of the pickup unit is connected with the signal input end of the amplifying circuit, the signal output end of the amplifying circuit is connected with the signal input end of the low-pass filtering and amplifying circuit, and the signal output end of the low-pass filtering and amplifying circuit is connected with the signal input end of the noise reduction module in the main control unit.
The further technical scheme is as follows: the amplifying circuit comprises a first integrated operational amplifying circuit IC1, a resistor R2, a resistor R3 and a resistor R4.
Specifically describing, one end of the resistor R2 is connected with the signal output end of the pickup unit, and the other end of the resistor R2 is connected with the negative electrode of the input end of the first integrated operational amplifier circuit IC1; the signal output end of the pickup unit outputs the collected electric signal representing the heart sound signal to the amplifying circuit through a resistor R2; the positive electrode of the input end of the first integrated operational amplifier circuit IC1 is grounded through a resistor R4; the output end of the first integrated operational amplifier circuit IC1 is connected with the signal input end of the low-pass filter amplifier circuit; the negative electrode of the input end of the first integrated operational amplifier circuit IC1 is connected with the output end of the first integrated operational amplifier circuit through the resistor R3.
Wherein, the resistance value of the resistor R2 is 2.2K; the resistance value of the resistor R3 is 47K; the resistance of the resistor R4 is 2.2K.
Since the heart sound signal detected by the sound pick-up unit contains a lot of noise, such as noise of the detection environment, noise of body surface friction, noise of other viscera movements inside the human body, etc., the presence of these noise may affect the accuracy of the stethoscope and may even lead to misdiagnosis. In order to obtain a purer heart sound signal, the noise must be removed, the signal to noise ratio of the heart sound is improved, and a low-pass filter can be designed according to the effective frequency band of the heart sound and the breathing sound to reduce noise interference. Because the heart sound frequency is lower, signals with the frequency higher than the sound frequency to be tested can be filtered out at the same time of signal amplification, so that the anti-interference capability of the system is improved. Therefore, the further technical scheme is as follows: the low-pass filter amplifying circuit comprises a second integrated operational amplifying circuit IC2, resistors R5-R8, a capacitor C3 and a capacitor C4.
The further technical scheme is as follows: one end of the resistor R5 is connected with the signal output end of the amplifying circuit, and the other end of the resistor R6 is respectively connected with one end of the capacitor C4; the other end of the resistor R6 and the negative electrode of the input end of the second integrated operational amplifier circuit IC2 are grounded through the capacitor C3; the other end of the capacitor C4 is respectively connected with the output end of the second integrated operational amplifier circuit IC2, one end of the resistor R7 and the signal input end of the main control unit; the other end of the resistor R7 and the positive electrode of the input end of the second integrated operational amplifier circuit IC2 are grounded through the resistor R8.
In detail, the resistor R5 and the resistor R6 are adjustable resistors, and the nominal resistance value is 33K.
The resistance value of the resistor R7 is 33K; the resistance of the resistor R8 is 33K. The capacitance value of the capacitor C3 is 0.047uF; the capacitance value of the capacitor C4 was 0.047uF.
The further technical scheme is as follows: the pickup unit includes a microphone MK2, a resistor R1, a capacitor C1, and a capacitor C2.
More specifically, one end of the capacitor C1 is connected to one end of the resistor R1; the other end of the resistor R1 is respectively connected with one end of the microphone MK2 and one end of the capacitor C2; the other end of the microphone MK2 and the other end of the capacitor C1 are grounded; the other end of the capacitor C2 is connected with the signal input end of the amplifying and filtering unit.
The further technical scheme is as follows: the Bluetooth stethoscope further comprises a power supply unit, wherein the power supply unit is respectively connected with the power supply ends of the amplifying and filtering unit and the main control unit and is used for supplying power to the amplifying and filtering unit and the main control unit.
Compared with the traditional earphone type stethoscope, the utility model has the advantages that: the designed Bluetooth stethoscope can carry out high-efficiency filtering and noise reduction treatment on collected sound signals, can effectively filter noise in the environment, can store and analyze collected sound data, and can help doctors to improve auscultation accuracy.
Drawings
Fig. 1 is a block diagram of a connection structure of a bluetooth stethoscope according to the present utility model.
Fig. 2 is a schematic circuit diagram of a bluetooth stethoscope according to the present utility model.
Detailed Description
The following describes the embodiments of the present utility model further with reference to the drawings. It should be noted that these embodiments are described herein for aiding in understanding the present utility model, but are not intended to limit the present utility model, and all other examples obtained by one of ordinary skill in the art without making any inventive effort based on these examples are intended to be within the scope of the present utility model.
As shown in fig. 1, in the embodiment of the bluetooth stethoscope according to the present utility model, the bluetooth stethoscope includes a bluetooth unit, an amplifying and filtering unit, a main control unit and a pickup unit, wherein a signal output end of the pickup unit is connected with a signal input end of the amplifying and filtering unit, a signal output end of the amplifying and filtering unit is connected with a signal input end of a noise reduction module in the main control unit, a signal output end of the noise reduction module is connected with a signal input end of an analog-to-digital conversion module in the main control unit, and a signal output end of the analog-to-digital conversion module is connected with a signal input end of a storage device through the bluetooth unit.
The bluetooth unit may be a bluetooth module, and is configured to communicate with the bluetooth module of the storage device and the master control unit in an interactive manner, and in this embodiment, support the iAP2 protocol; the Bluetooth module in the embodiment uses an HC06 module, is a data transmission module based on Bluetooth Specification V2.0 Bluetooth protocol with EDR, has a wireless working frequency band of 2.4GHz ISM, and adopts a GFSK modulation mode; the maximum transmitting power of the module is 4dBm, the receiving sensitivity is-85 dBm, and the on-board PCB antenna can realize 10 m distance communication.
The main control unit can be a micro controller chip MCU (STM 32F 103) which is used for carrying out noise reduction treatment and analog-to-digital conversion on the analog signals output by the amplifying and filtering unit, and then sending the converted digital signals to a computer or a HIS (Hospital Information System) system of a hospital through the Bluetooth unit.
The amplifying and filtering unit comprises amplifying and filtering functions; the amplifying and filtering unit comprises amplifying and filtering functions; the sound pick-up unit collects an electric signal representing a heart sound signal through the heart sound sensor and outputs the electric signal to the signal input end of the amplifying and filtering unit through the signal output end; the amplifying and filtering unit amplifies the electric signal and outputs the amplified electric signal to the signal input end of the main control unit through the signal output end; the main control unit suppresses and filters the environmental noise in the received electric signals, then carries out analog-to-digital conversion, converts the electric signals into digital signals, outputs the digital signals to the Bluetooth unit through the signal output end, and transmits the digital signals to a computer or a HIS system of a hospital through the Bluetooth unit.
As shown in fig. 2, the amplifying and filtering unit includes an amplifying circuit, which uses an amplifying circuit mainly including an LM741 in this embodiment, and includes a first integrated operational amplifying circuit IC1 and resistors R2, R3, and R4, where one end of the resistor R2 is connected to a signal output end of the pickup, and the other end is connected to an input end negative electrode of the first integrated operational amplifying circuit IC1; the signal output end of the pickup outputs the collected electric signal representing the heart sound signal to the amplifying circuit through a resistor R2; the positive electrode of the input end of the first integrated operational amplifier circuit IC1 is grounded through a resistor R4; the output end of the first integrated operational amplifier circuit IC1 is connected with the signal input end of the low-pass filter amplifier circuit; according to V out ＝-V in *R 3 /R 2 The amplification factor of the amplifying circuit is regulated by resistors R3 and R2, wherein R 3 Represents the resistance value of the resistor R3, R 2 The resistance value of the resistor R2; in this embodiment, the resistance of R3 is 47K, and the resistance of R2 is 2.2K; the magnification is thus 47K/2.2k=21.3 times.
The amplifying and filtering unit further includes a low-pass filtering and amplifying circuit using the LM741 as a main low-pass filtering and amplifying circuit.
The low-pass filter amplifying circuit in this embodiment is composed of a second operational amplifying integrated circuit IC2, capacitors C3-C4 and resistors R5-R8, one end of the resistor R5 is connected with the signal output end of the amplifying circuit, and the other end is respectively connected with one end of the resistor R6 and one end of the capacitor C4The method comprises the steps of carrying out a first treatment on the surface of the The other end of the resistor R6 and the negative electrode of the input end of the second integrated operational amplifier circuit IC2 are grounded through a capacitor C3; the other end of the capacitor C4 is respectively connected with the output end of the second integrated operational amplifier circuit IC2, one end of the resistor R7 and the signal input end of the main control unit; the other end of the resistor R7 and the positive electrode of the input end of the second integrated operational amplifier circuit IC2 are grounded through a resistor R8. The second integrated operational amplifier circuit IC2 gains and buffers signals by using the modes of the same-direction input operational amplifier, high input impedance and low output impedance; resistors R7 and R8 feed back a part of the signal at the output end of the second integrated operational amplifier circuit IC2 to the positive electrode of the input end of the second integrated operational amplifier circuit IC 2; the capacitors C3 and C4 are used for isolating low-frequency signals and high-frequency signals, and the charging and discharging speeds of the capacitors C3 and C4 are controlled by adjusting the resistance values of the resistors R5 and R6, so that the time constant is adjusted, and the required frequency characteristic is obtained; its cut-off frequency f 0 The method comprises the following steps:
C 3 and C 4 Respectively represent the capacitance C 3 And C 4 In this example, 0.047uF;
r5 and R6 respectively represent resistance values of resistors R5 and R6, and in the embodiment, the resistors R5 and R6 are adjustable resistors, and nominal resistance values are 33K.
The pick-up unit comprises a microphone MK2, a resistor R1, and capacitors C1 and C2; one end of the capacitor C1 is connected with one end of the resistor R1; the other end of the resistor R1 is connected with one end of the microphone MK2 and one end of the capacitor C2 respectively; the other end of the microphone MK2 and the other end of the capacitor C1 are grounded; the other end of the capacitor C2 is connected with the signal input end of the amplifying and filtering unit. In this embodiment, the capacitor C1 is used for filtering, and its capacitance is 470uF; the resistor R1 is a current limiting resistor, and the resistance value of the resistor R1 is 10K; the capacitance of the capacitor C2 is 0.047uF, and the output signal of the pickup unit is coupled to the first integrated operational amplifier circuit IC1 in the amplifying and filtering unit through the capacitor C2; the microphone MK2 in this embodiment uses the sensitivity of an electret condenser microphone, and the amplitude of the heart sound signal is: 30-60 mV.
The working process of the utility model is as follows: when the Bluetooth stethoscope is used, auscultation sounds such as heart sounds, chest sounds and abdomen sounds are collected by the sound pick-up unit, the function is equivalent to a microphone, collected sound signals are converted into analog electric signals, the analog electric signals are transmitted to the amplifying circuit unit, the amplifying circuit unit adopts a pre-amplifying circuit formed by the first integrated operational amplifying circuit IC1 and resistors R2, R3 and R4 to amplify the analog electric signals, weak sounds are amplified to a clear degree, meanwhile, the gain of the amplifier can be adjusted through the ratio of R3 to R2 in the amplifying circuit, and the analog electric signals are amplified by the amplifying circuit unit and then transmitted to the low-pass filtering amplifying circuit in the filtering circuit unit, so that the frequency of the sounds is controlled in a set range; the analog electric signal after low-pass filtering is transmitted to a Micro Controller Unit (MCU), the MCU suppresses and filters environmental noise, and limits the bandwidth range of sound signals such as heartbeat sound, chest and abdomen, so that noise in the environment is filtered, the MCU performs A/D (analog-to-digital conversion) on the analog electric signal after noise is filtered, and then the analog electric signal is transmitted to a computer or an HIS system of a hospital through a Bluetooth unit for analysis and storage of sound data.
In summary, by means of the technical scheme of the utility model, the collected sound signals can be subjected to efficient filtering and noise reduction treatment, so that noise in the environment can be effectively filtered, collected sound data can be stored and analyzed, and the accuracy of doctor diagnosis can be improved.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.
Claims (7)
1. The Bluetooth stethoscope is characterized by comprising a Bluetooth unit, an amplifying and filtering unit, a main control unit and a pickup unit, wherein the signal output end of the pickup unit is connected with the signal input end of the amplifying and filtering unit, the signal output end of the amplifying and filtering unit is connected with the signal input end of a noise reduction module in the main control unit, the signal output end of the noise reduction module in the main control unit is connected with the signal input end of an analog-to-digital conversion module in the main control unit, and the signal output end of the analog-to-digital conversion module in the main control unit is connected with the signal input end of a storage device through the Bluetooth unit;
the amplifying and filtering unit comprises a low-pass filtering and amplifying circuit, wherein the low-pass filtering and amplifying circuit comprises a second integrated operational amplifying circuit IC2, resistors R5-R8, a capacitor C3 and a capacitor C4; one end of the resistor R5 is connected with the signal output end of the amplifying circuit, and the other end of the resistor R6 is respectively connected with one end of the capacitor C4; the other end of the resistor R6 and the negative electrode of the input end of the second integrated operational amplifier circuit IC2 are grounded through the capacitor C3; the other end of the capacitor C4 is respectively connected with the output end of the second integrated operational amplifier circuit IC2, one end of the resistor R7 and the signal input end of the main control unit; the other end of the resistor R7 and the positive electrode of the input end of the second integrated operational amplifier circuit IC2 are grounded through the resistor R8.
2. The bluetooth stethoscope according to claim 1, wherein the amplifying and filtering unit comprises an amplifying circuit, wherein the signal output end of the pickup unit is connected with the signal input end of the amplifying circuit, the signal output end of the amplifying circuit is connected with the signal input end of the low-pass filtering and amplifying circuit, and the signal output end of the low-pass filtering and amplifying circuit is connected with the signal input end of the noise reduction module in the main control unit.
3. The bluetooth stethoscope of claim 2, wherein said amplifying circuit comprises a first integrated operational amplifying circuit IC1, a resistor R2, a resistor R3, and a resistor R4.
4. The Bluetooth stethoscope as defined in claim 3, wherein one end of the resistor R2 is connected with the signal output end of the sound pick-up unit, and the other end is connected with the negative electrode of the input end of the first integrated operational amplifier circuit IC1; the signal output end of the pickup unit outputs the collected electric signal representing the heart sound signal to the amplifying circuit through a resistor R2; the positive electrode of the input end of the first integrated operational amplifier circuit IC1 is grounded through the resistor R4; the output end of the first integrated operational amplifier circuit IC1 is connected with the signal input end of the low-pass filter amplifier circuit; the negative electrode of the input end of the first integrated operational amplifier circuit IC1 is connected with the output end of the first integrated operational amplifier circuit through the resistor R3.
5. The bluetooth stethoscope according to claim 3 or 4, wherein the resistor R5 and/or the resistor R6 is an adjustable resistor.
6. The bluetooth stethoscope of claim 1, wherein said sound pick-up unit includes a microphone MK2, a resistor R1, a capacitor C1 and a capacitor C2.
7. The bluetooth stethoscope according to claim 6, wherein one end of said capacitor C1 is connected to one end of said resistor R1; the other end of the resistor R1 is respectively connected with one end of the microphone MK2 and one end of the capacitor C2; the other end of the microphone MK2 and the other end of the capacitor C1 are grounded; the other end of the capacitor C2 is connected with the signal input end of the amplifying and filtering unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320197110.6U CN219501040U (en) | 2023-02-13 | 2023-02-13 | Bluetooth stethoscope |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320197110.6U CN219501040U (en) | 2023-02-13 | 2023-02-13 | Bluetooth stethoscope |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219501040U true CN219501040U (en) | 2023-08-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320197110.6U Active CN219501040U (en) | 2023-02-13 | 2023-02-13 | Bluetooth stethoscope |
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|---|---|
| CN (1) | CN219501040U (en) |
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2023
- 2023-02-13 CN CN202320197110.6U patent/CN219501040U/en active Active
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