CN107773268A - A kind of stethoscope with heart rate detecting function - Google Patents

Abstract

The invention discloses a stethoscope with a heart rate detection function, which comprises a stethoscope body. The stethoscope body includes a stethoscope head, a sound guide tube, a trident joint and an earpiece. A resonant plate is arranged in the stethoscope head. The invention also includes a heart rate sensor and a signal amplifier. Module, reference module, comparison module, counting module and display module, the output end of the heart rate sensor is connected to the input end of the signal amplification module, the output end of the signal amplification module and the output end of the reference module are respectively connected to the input end of the comparison module, and the output end of the comparison module is connected to the input end of the counting module The input end of the module is connected, and the output end of the counting module is connected with the input end of the display module. The invention converts the patient's heart beat signal into an electrical signal through the heart rate sensor, judges each effective heart beat through the comparison module, and uses the counting module to calculate the patient's heart rate value according to the output signal of the comparison module, thereby improving the accuracy of heart rate detection. The invention is used to detect the heart rate value of the patient.

Description

A stethoscope with heart rate detection function

technical field

The invention relates to the technical field of medical instruments, and more specifically relates to a stethoscope structure.

Background technique

When a patient registers to see a doctor in a hospital outpatient clinic, the doctor first needs to use a stethoscope to auscultate the patient. The doctor uses the stethoscope to observe the patient's heartbeat, mainly to observe the heart sound and heart rate. The beating condition of the heart.

When a doctor uses a traditional stethoscope to detect the patient's heart rate, it mainly calculates the patient's heart rate subjectively. The doctor needs to spend a period of time estimating the patient's heart rate. , resulting in the lack of an objective judgment benchmark for the patient's heart rate detection, thereby increasing the probability of misjudgment.

Contents of the invention

The technical problem to be solved by the present invention is to provide a stethoscope capable of intelligently displaying the patient's heart rate.

The solution that the present invention solves its technical problem is:

A stethoscope with heart rate detection function, comprising a stethoscope body, the stethoscope body includes a stethoscope head, a sound guide tube, a trident connector and an earpiece, the stethoscope head is connected to the earpiece by the sound guide tube through the trident connector, the stethoscope head There is a resonant plate inside, and the invention also includes a heart rate sensor, a signal amplification module, a reference module, a comparison module, a counting module and a display module; wherein the signal amplification module is used to filter and amplify the input signal, and the reference The module is used to provide a reference voltage signal, the comparison module is used to compare the signal amplification module and the size of the output voltage signal of the reference module, and the counting module is used to calculate the number of heart beats according to the output waveform of the comparison module, that is, to calculate the heart rate value, the The display module displays the calculated heart rate value, and the display module can be installed on the three-prong connector, or can be arranged in other positions, and is connected to the counting module through a wireless communication module, such as a Bluetooth module; the output terminal of the heart rate sensor is connected to the signal amplification The input terminals of the modules are connected, the output terminals of the signal amplification module and the output terminals of the reference module are respectively connected with the input terminals of the comparison module, the output terminals of the comparison module are connected with the input terminals of the counting module, and the output terminals of the counting module are connected with the input terminals of the display module , the heart rate sensor is installed inside the stethoscope head and converts the mechanical vibration signal of the resonant plate into an electrical signal.

As a further improvement of the above technical solution, the heart rate sensor includes an inductance coil and a permanent magnet that generates a constant magnetic field. connected to the input.

As a further improvement of the above technical solution, the signal amplifying module includes a filtering unit and an amplifying unit, the filtering unit is a low-pass filter, the output terminal of the heart rate sensor is connected to the input terminal of the filtering unit, and the output terminal of the filtering unit is connected to the input terminal of the filtering unit. The input end of the amplifying unit is connected, and the output end of the amplifying unit is connected with the input end of the comparison module.

As a further improvement of the above technical solution, the filter unit includes capacitor C1, capacitor C2, resistor R1, resistor R2, resistor R3, resistor R4 and operational amplifier A1, the resistor R1 and resistor R2 are connected in series between the inductor coil and the operational amplifier Between the non-inverting input terminals of the op amp A1, the resistor R3 and the resistor R4 are connected in series between the output terminal of the operational amplifier A1 and the ground terminal, and the inverting input terminal of the operational amplifier A1 is connected to the connection point of the resistor R3 and the resistor R4, The output terminal of the operational amplifier A1 is connected to the connection point of the resistor R1 and the resistor R2 through the capacitor C1, the two ends of the capacitor C2 are respectively connected to the in-phase input terminal of the operational amplifier A1 and the ground terminal, and the output terminal of the operational amplifier A1 Connected to the input of the amplifier unit.

As a further improvement of the above technical solution, the amplifying unit includes an amplifier chip modeled as MAX9812, the output end of the filtering unit is connected to the input end of the amplifier chip, and the output end of the amplifier chip is connected to a comparison module.

As a further improvement of the above technical solution, the counting module includes a single-chip microcomputer chip, the input terminal of the single-chip microcomputer chip is connected to the output terminal of the comparison module, and the output terminal of the single-chip microcomputer chip is connected to the input terminal of the display module.

The beneficial effects of the present invention are: the present invention converts the patient's heart beat signal into an electrical signal through the heart rate sensor, judges each effective heart beat through the comparison module, uses the counting module to calculate the patient's heart rate value according to the output signal of the comparison module, and The result is output to the display module, which is convenient for doctors to observe, avoids the doctor's subjective judgment of the patient's heart rate value in the traditional treatment process, and improves the accuracy of heart rate detection. The invention is used to detect the heart rate value of the patient.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly describe the drawings that need to be used in the description of the embodiments. Apparently, the described drawings are only some embodiments of the present invention, not all embodiments, and those skilled in the art can obtain other designs and drawings based on these drawings without creative work.

Fig. 1 is a stethoscope structural representation of the present invention;

Fig. 2 is a block diagram of a circuit module created by the present invention;

Fig. 3 is a schematic diagram of an embodiment of the signal amplification module of the present invention.

Detailed ways

The concept, specific structure and technical effects of the present invention will be clearly and completely described below in conjunction with the embodiments and accompanying drawings, so as to fully understand the purpose, features and effects of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative efforts belong to The protection scope of the present invention. In addition, all connection relationships mentioned in the text do not simply refer to the direct connection of components, but mean that a more optimal circuit structure can be formed by adding or reducing connection components according to specific implementation conditions. The various technical features in the invention can be combined interactively on the premise of not conflicting with each other.

1 to 3, the present invention provides a stethoscope with a heart rate detection function, including a stethoscope body, the stethoscope body includes a stethoscope head 1, a sound guide tube 2, a trident joint 3 and an earpiece 4, the stethoscope head 1. The sound guide tube 2 is connected to the earpiece 4 through the trident joint 3. The auscultation head 1 is provided with a resonant plate. The invention also includes a heart rate sensor, a signal amplification module, a reference module, a comparison module, a counting module and a display module ; wherein the signal amplification module is used to filter and amplify the input signal, the reference module is used to provide a reference voltage signal, and the comparison module is used to compare the signal amplification module and the size of the output voltage signal of the reference module. The counting module is used to calculate the number of heart beats according to the output waveform of the comparison module, that is, to calculate the heart rate value. The display module displays the calculated heart rate value. The display module can be installed on the trident joint 3 or can be set at other positions. A wireless communication module, such as a bluetooth module, is connected in communication with the counting module; the output end of the heart rate sensor is connected to the input end of the signal amplification module, and the output end of the signal amplification module and the output end of the reference module are respectively connected to the input end of the comparison module. The output terminal of the module is connected with the input terminal of the counting module, and the output terminal of the counting module is connected with the input terminal of the display module. The heart rate sensor is installed inside the stethoscope head 1 and converts the mechanical vibration signal of the resonant plate into an electrical signal.

The working principle of the present invention is as follows. First, the heart rate sensor is used to convert the sound vibration signal generated by the beating heart into an electrical signal, and the electrical signal is input to the signal amplification module for filtering and amplification operations. Each beating of the human heart is converted into a voltage signal, there will be a highest voltage amplitude in each beating cycle, and when the signal amplification module outputs an amplitude voltage greater than the output voltage of the reference module, the comparison module will output a specific level signal, and the specific level The signal can be determined according to the specific circuit connection mode. The counting module is used to calculate the time difference between the specific levels output by the two comparison modules, that is, the time interval between each heart beat, so as to indirectly calculate the time interval of the heart beat within one minute. The number of times is the heart rate value of the patient.

The invention converts the patient's heart beat signal into an electrical signal through the heart rate sensor, judges each effective heart beat through the comparison module, uses the counting module to calculate the patient's heart rate value according to the output signal of the comparison module, and outputs the result to the display module , It is convenient for doctors to observe, avoiding the doctor's subjective consciousness to judge the patient's heart rate value in the traditional treatment process, and improving the accuracy of heart rate detection.

As a further preferred embodiment, the heart rate sensor is used to collect the beating sound signal of the patient's heart and convert it into an electrical signal. In order to realize the function of the heart rate sensor, in the specific embodiment of the present invention, the heart rate sensor includes an inductance coil and a permanent magnet that generates a constant magnetic field, the inductance coil is arranged on the resonant plate, and the permanent magnet is installed inside the stethoscope head 1 , the inductance coil is connected to the input end of the signal amplification module. Every time the human heart beats, a sound will be produced, and the sound enters the stethoscope head 1 to vibrate the internal resonant plate, thereby driving the induction coil to cut the magnetic induction line in the magnetic field, and generate corresponding electrical signals.

As a further preferred embodiment, there are certain high-frequency clutter signals in the electrical signal output by the heart rate sensor in the present invention, which is likely to affect the judgment result of the comparison module, and at the same time, the electrical signal output by the heart rate sensor is relatively weak , the amplitude is low, combined with the above reasons, the signal amplification module in the specific embodiment of the present invention needs to have filtering and amplification functions at the same time, the signal amplification module includes a filtering unit and an amplification unit, and the filtering unit is a low-pass filter The output terminal of the heart rate sensor is connected to the input terminal of the filter unit, the output terminal of the filter unit is connected to the input terminal of the amplification unit, and the output terminal of the amplification unit is connected to the input terminal of the comparison module.

Further as a preferred implementation mode, in the specific implementation mode of the present invention, the filter unit includes a capacitor C1, a capacitor C2, a resistor R1, a resistor R2, a resistor R3, a resistor R4 and an operational amplifier A1, and the resistor R1 and the resistor R2 It is connected in series between the inductance coil and the non-inverting input terminal of the operational amplifier A1, the resistor R3 and the resistor R4 are connected in series between the output terminal of the operational amplifier A1 and the ground terminal, and the inverting input terminal of the operational amplifier A1 is connected to the resistor R3 and the connection point of the resistor R4, the output terminal of the operational amplifier A1 is connected to the connection point of the resistor R1 and the resistor R2 through the capacitor C1, and the two ends of the capacitor C2 are respectively connected to the in-phase input terminal of the operational amplifier A1 and the ground terminal, so The output end of the operational amplifier A1 is connected to the input end of the amplifying unit. Specifically, the filtering unit in this embodiment is a second-order active low-pass filter with good filtering effect.

Further as a preferred implementation mode, in the specific implementation mode of the present invention, the amplifying unit includes an amplifier chip whose model is MAX9812, the output terminal of the filtering unit is connected to the input terminal of the amplifier chip, and the output terminal of the amplifier chip is connected to the comparison module . In this embodiment, a highly integrated amplifier chip is used to amplify the electrical signal output by the filter unit, which greatly reduces the complexity of the circuit structure.

As a further preferred embodiment, in the specific embodiment of the present invention, the counting module includes a single-chip microcomputer chip, the input terminal of the single-chip microcomputer chip is connected to the output terminal of the comparison module, and the output terminal of the single-chip microcomputer chip is connected to the input terminal of the display module. Specifically, when the single-chip microcomputer chip receives the specific level signal output by the comparison module, the timer inside the single-chip microcomputer chip is started, and when the single-chip microcomputer chip receives the level signal again, the timer is stopped. The time interval of the level signal calculates the number of times the heart beats in one minute, that is, the heart rate value.

The preferred embodiments of the present invention have been described in detail above, but the invention is not limited to the described embodiments, and those skilled in the art can also make various equivalent modifications or replacements without violating the spirit of the present invention. These equivalent modifications or replacements are all within the scope defined by the claims of the present application.

Claims (6)

1. a stethoscope with a heart rate detection function, comprising a stethoscope body, said stethoscope body comprising a stethoscope head, a sound guide tube, a trident connector and an earpiece, said auscultation head being connected with the earpiece by a sound guide tube by a trident connector, said The auscultation head is provided with a resonant piece, and it is characterized in that: it also includes a heart rate sensor, a signal amplification module, a reference module, a comparison module, a counting module and a display module, the output of the heart rate sensor is connected with the input of the signal amplification module, and the signal The output end of the amplification module and the output end of the reference module are respectively connected to the input end of the comparison module, the output end of the comparison module is connected to the input end of the counting module, the output end of the counting module is connected to the input end of the display module, and the heart rate sensor is installed on the auscultation Inside the head and convert the mechanical vibration signal of the resonator plate into an electrical signal. 2. a kind of stethoscope with heart rate detection function according to claim 1, it is characterized in that: described heart rate sensor comprises induction coil and the permanent magnet that produces constant magnetic field, and described induction coil is arranged on the resonance plate, and described permanent magnet Installed inside the auscultation head, the inductance coil is connected with the input end of the signal amplification module. 3. a kind of stethoscope with heart rate detection function according to claim 2, it is characterized in that: described signal amplifying module comprises filtering unit and amplifying unit, and described filtering unit is a low-pass filter, and described heart rate sensor output terminal It is connected to the input end of the filtering unit, the output end of the filtering unit is connected to the input end of the amplifying unit, and the output end of the amplifying unit is connected to the input end of the comparison module. 4. a kind of stethoscope with heart rate detection function according to claim 3, is characterized in that: described filtering unit comprises electric capacity C1, electric capacity C2, resistance R1, resistance R2, resistance R3, resistance R4 and operational amplifier A1, The resistor R1 and the resistor R2 are connected in series between the inductance coil and the non-inverting input terminal of the operational amplifier A1, the resistor R3 and the resistor R4 are connected in series between the output terminal of the operational amplifier A1 and the ground terminal, and the operational amplifier A1 is reversed. The phase input terminal is connected to the connection point of the resistor R3 and the resistor R4, the output terminal of the operational amplifier A1 is connected to the connection point of the resistor R1 and the resistor R2 through the capacitor C1, and the two ends of the capacitor C2 are respectively input in phase with the operational amplifier A1 terminal is connected to the ground terminal, and the output terminal of the operational amplifier A1 is connected to the input terminal of the amplifying unit. 5. a kind of stethoscope with heart rate detection function according to claim 4, it is characterized in that: described amplifying unit comprises the amplifier chip that model is MAX9812, and described filtering unit output is connected with amplifier chip input end, and described amplifier The output terminal of the chip is connected with the comparison module. 6. a kind of stethoscope with heart rate detection function according to claim 1, is characterized in that: described counting module comprises single-chip microcomputer chip, and described single-chip microcomputer chip input terminal links to each other with comparison module output end, and described single-chip microcomputer chip output terminal is connected with The input terminal of the display module is connected.