A respiration detection sensor

Abstract

The present invention discloses a respiration detection sensor, which relates to the medical field. It includes a sensor housing, an elastic component, a first coil, a second coil and a conversion module arranged inside the sensor housing. The first coil is installed inside the sensor housing. One side of the sensor housing is open, and the elastic component is arranged at the opening of the sensor housing. The second coil is installed on the elastic component, and the side of the second coil away from the elastic component is inside the first coil. The second coil moves inside the first coil as the elastic component deforms. The processing module determines the respiration state of the patient according to the first direct current signal converted by the conversion module, directly senses according to the state of the patient's abdomen, reduces or even eliminates the influence of the patient's limb movement, improves the anti-interference ability, is not affected by the environment of the ward where the patient is located, improves the reliability, and can continuously monitor the respiration state of the patient multiple times, reducing the treatment cost of the patient.

Description

Technical Field

[0001] The present invention relates to the field of medicine, and particularly to a respiratory detection sensor. Background Art

[0002] Currently, sensors for detecting the respiration of patients are usually surface tension type respiration sensors and carbon dioxide detection type sensors. The first type of sensor has low anti-interference ability and is affected by other movements besides the patient's respiration. This sensor may misjudge, for example, the limb movement of the patient as the patient's respiration. The second type of sensor has strict environmental requirements for the ward where the patient is located and is easily affected by the wind force, temperature, and humidity in the ward where the patient is located during the detection process, resulting in a decrease in the detection accuracy. In addition, the detection of this sensor is a one-time detection, which will cause waste of resources and increase the treatment cost of the patient. Summary of the Invention

[0003] The object of the present invention is to provide a respiratory detection sensor, which reduces or even eliminates the influence of the patient's limb movement, improves the anti-interference ability, is not affected by the environment of the ward where the patient is located, improves the reliability, and can continuously monitor the respiratory state of the patient multiple times, reducing the treatment cost of the patient.

[0004] To solve the above technical problems, the present invention provides a respiratory detection sensor, including: a sensor housing, an elastic member, a first coil, a second coil, and a conversion module disposed inside the sensor housing;

[0005] The first coil is installed inside the sensor housing and is used for emitting an electromagnetic signal;

[0006] One side of the sensor housing is open, and the elastic member is disposed at the opening of the sensor housing;

[0007] The second coil is installed on the elastic member, and the side of the second coil away from the elastic member is inside the first coil. The coil diameter of the first coil is larger than the coil diameter of the second coil;

[0008] The second coil is used for moving inside the first coil along with the deformation of the elastic member and generating an alternating current signal according to the electromagnetic signal and the mutual inductance between the first coil and the second coil;

[0009] The input end of the conversion module is connected to the side of the second coil close to the elastic member, and is used for collecting the alternating current signal of the second coil and converting the alternating current signal into a first direct current signal and sending it to a processing module that processes the first direct current signal;

[0010] The processing module is connected to the output end of the conversion module and is configured to determine the breathing state of the patient according to the first direct current signal.

[0011] Preferably, the first coil is installed on the inner wall away from the opening of the sensor housing.

[0012] Preferably, the conversion module includes:

[0013] A rectification module, the input end of which serves as the input end of the conversion module, and is configured to collect the alternating current signal and rectify it into a second direct current signal;

[0014] A current amplification module, the input end of which is connected to the output end of the rectification module, and the output end of which serves as the output end of the conversion module, and is configured to convert the second direct current signal into the first direct current signal, and the voltage value of the first direct current signal is greater than the voltage value of the second direct current signal.

[0015] Preferably, the rectification module includes: a first resistor, a second resistor, a third resistor, a fourth resistor, a first diode, a second diode and a first operational amplifier;

[0016] The non-inverting input end of the first operational amplifier is grounded, the inverting input end is respectively connected to one end of the first resistor, one end of the second resistor and the cathode of the first diode, the output end of the first operational amplifier is respectively connected to the anode and the cathode of the first diode, the anode of the second diode is respectively connected to the other end of the second resistor and one end of the third resistor, one end of the first resistor is connected to one end of the fourth resistor, and the other end of the fourth resistor is connected to the other end of the third resistor, and the common connection end is used as the output end of the rectification module.

[0017] Preferably, the current amplification module includes: a fifth resistor, a sixth resistor and a second operational amplifier;

[0018] The inverting input end of the second operational amplifier is grounded, the non-inverting input end is respectively connected to one end of the fifth resistor and the output end of the rectification circuit, the output end of the second operational amplifier is respectively connected to the other end of the fifth resistor and one end of the sixth resistor, and the other end of the sixth resistor serves as the output end of the current amplification module.

[0019] Preferably, the processing module is a single-chip microcomputer.

[0020] Preferably, a filter capacitor is further included. One end of the filter capacitor is respectively connected to the output end of the rectification circuit and one end of the fifth resistor, and the other end of the filter capacitor is respectively connected to the output end of the second operational amplifier and one end of the sixth resistor.

[0021] Preferably, a seventh resistor is further included. One end of the seventh resistor is grounded, and the other end is connected to the input end of the rectification module.

[0022] Preferably, the processing module is specifically configured to determine that the patient is inhaling when the increased value of the voltage of the first direct current signal reaches a preset threshold within a preset time; determine that the patient is exhaling when the decreased value of the voltage of the first direct current signal reaches a preset threshold within a preset time; and determine that the patient has stopped breathing when the voltage of the first direct current signal remains unchanged within a preset time.

[0023] The present application provides a respiration detection sensor, which includes a sensor housing, an elastic member, a first coil, a second coil and a conversion module arranged inside the sensor housing. The first coil is installed inside the sensor housing; one side of the sensor housing is open, and the elastic member is arranged at the opening of the sensor housing; the second coil is installed on the elastic member, and the side of the second coil away from the elastic member is inside the first coil; the elastic member deforms with the respiration of the patient, and the second coil moves inside the first coil as the elastic member deforms. In the present application, when the patient breathes, the second coil moves with the elastic member, and the second coil moves in the first coil. The alternating current signals of the second coil collected when the patient breathes are different. The processing module determines the respiration state of the patient according to the first direct current signal converted by the conversion module. Since the elastic member is in contact with the patient's abdomen, the sensing is directly based on the state of the patient's abdomen, reducing or even eliminating the influence of the patient's limb movement, improving the anti-interference ability. This sensor is not affected by the environment of the ward where the patient is located, improving the reliability, and can continuously monitor the respiration state of the patient multiple times, reducing the treatment cost of the patient. Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the prior art and the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 It is a schematic structural diagram of a respiration detection sensor provided by the present invention;

[0026] Figure 2 It is a 3D effect diagram of a first coil and a second coil provided by the present invention;

[0027] Figure 3 It is a schematic structural diagram of a conversion module of a respiration detection sensor provided by the present invention. Detailed Embodiments

[0028] The core of the present invention is to provide a respiration detection sensor, which reduces or even eliminates the influence of the patient's limb movement, improves the anti-interference ability, is not affected by the environment of the ward where the patient is located, improves the reliability, and can continuously monitor the patient's respiration state multiple times, reducing the treatment cost of the patient.

[0029] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0030] Please refer to Figure 1 、 Figure 2 and Figure 3 , Figure 1 which is a schematic structural diagram of a respiration detection sensor provided by the present invention, Figure 2 which is a 3D effect diagram of a first coil and a second coil provided by the present invention, Figure 3 which is a schematic structural diagram of a conversion module of a respiration detection sensor provided by the present invention. The respiration detection sensor includes: a sensor housing, an elastic member 1, a first coil 2, a second coil 3 and a conversion module 4 arranged inside the sensor housing;

[0031] The first coil 2 is installed inside the sensor housing and is used for emitting an electromagnetic signal;

[0032] One side of the sensor housing is open, and the elastic member 1 is arranged at the opening of the sensor housing;

[0033] The second coil 3 is installed on the elastic member 1. The side of the second coil 3 away from the elastic member 1 is inside the first coil 2, and the coil diameter of the first coil 2 is larger than that of the second coil 3;

[0034] The second coil 3 is used for moving inside the first coil 2 along with the deformation of the elastic member 1 and generating an alternating current signal according to the electromagnetic signal and the mutual inductance between the first coil 2 and the second coil 3;

[0035] The input end of the conversion module 4 is connected to the side of the second coil 3 close to the elastic member 1 and is used for collecting the alternating current signal of the second coil 3 and converting the alternating current signal into a first direct current signal to be sent to a processing module for processing the first direct current signal;

[0036] The processing module is connected to the output end of the conversion module 4 and is used for determining the respiration state of the patient according to the first direct current signal.

[0037] When the respiratory detection sensor is in actual use, the elastic component 1 is abutted against the patient's abdomen. When the patient performs a breathing action, the elastic component 1 deforms accordingly, and the second coil 3 fixed on the elastic component 1 moves up and down. The second coil 3 moves inside the first coil 2. The first coil 2 is connected to a power supply and emits an electromagnetic signal. Electromagnetic mutual induction occurs between the second coil 3 and the first coil 2. Then, the conversion module 4 is connected to the side of the second coil 3 close to the elastic component 1, collects the alternating current signal and feeds it back to the controller. The controller can determine the patient's respiratory state based on the signal converted by the conversion module 4. The respiratory detection sensor can be continuously used multiple times, is not affected by the external environment, and can save the patient's treatment cost.

[0038] Specifically, the first coil 2 is installed inside the sensor housing and emits an electromagnetic signal, providing a basic electromagnetic signal for the second coil 3 to move inside the first coil 2. One side of the sensor housing is open, and the elastic component 1 is arranged at the opening of the sensor housing. In this way, other parts of the housing can well protect the internal structure of the respiratory detection sensor. Arranging the elastic component 1 at the opening position can closely adhere to the patient's abdomen, and at the same time has elasticity and is easy to deform. The second coil 3 is installed on the elastic component 1. The side of the second coil 3 away from the elastic component 1 is inside the first coil 2. The coil diameter of the first coil 2 is larger than that of the second coil 3. The first coil 2 is set as a coil with a larger diameter to generate an electromagnetic signal. The second coil 3 has a small diameter and a light weight, making it easier not to affect the patient's breathing when the patient breathes. The second coil 3 moves inside the first coil 2 along with the deformation of the elastic component 1 and generates an alternating current signal according to the electromagnetic signal and the mutual induction between the first coil 2 and the second coil 3. This alternating current signal is essentially the electromagnetic signal of the second coil 3 after the mutual induction between the first coil 2 and the second coil 3. This signal is an alternating current signal. The input end of the conversion module 4 is connected to the side of the second coil 3 close to the elastic component 1, for collecting the alternating current signal of the second coil 3 and converting the alternating current signal into a first direct current signal and sending it to the processing module for processing the first direct current signal. The processing module is connected to the output end of the conversion module 4, for determining the patient's respiratory state based on the first direct current signal, and specifically can determine whether the patient is exhaling, inhaling or holding their breath at this time, improving the reliability. Being closely attached to the abdomen also improves the anti-interference ability.

[0039] It should be noted that the first coil 2 and the second coil 3 are concentric and vertically nested coaxially.

[0040] It should be noted that during the inhalation process of the patient, the abdomen is in a bulging state. At this time, the lower surface of the elastic component 1 closely attached to the abdomen will also deform upward, and the second coil 3 will displace upward along the central axis. At this time, according to the principle of electromagnetic mutual induction, an electromagnetic signal will be generated in the second coil 3 due to mutual induction. The higher it moves upward, the greater the output effect value. It can be obtained through the same theoretical demonstration that during the exhalation process, the abdomen will concave downward and the second coil 3 will displace downward along the central axis. At this time, according to the principle of electromagnetic mutual induction, an electromagnetic signal will be generated in the second coil 3 due to mutual induction. The lower it moves downward, the smaller the output effect value. Thus, the breathing state of the patient at this time can be determined.

[0041] Generally speaking, the present application provides a breathing detection sensor. It includes a sensor housing, an elastic component 1, a first coil 2, a second coil 3 and a conversion module 4 arranged inside the sensor housing. The first coil 2 is installed inside the sensor housing; one side of the sensor housing is open, and the elastic component 1 is arranged at the opening of the sensor housing; the second coil 3 is installed on the elastic component 1, and the side of the second coil 3 away from the elastic component 1 is inside the first coil 2; the elastic component 1 deforms with the patient's breathing, and the second coil 3 moves inside the first coil 2 along with the deformation of the elastic component 1. In the present application, when the patient breathes, the second coil 3 moves along with the elastic component 1, and the second coil 3 moves in the first coil 2. The alternating current signals of the second coil 3 collected during the patient's breathing are different. The processing module determines the breathing state of the patient according to the first direct current signal converted by the conversion module 4. Since the elastic component 1 is attached to the patient's abdomen, the sensing is directly based on the state of the patient's abdomen, reducing or even eliminating the influence of the patient's limb movement, improving the anti-interference ability. This sensor is not affected by the environment of the ward where the patient is located, improving the reliability, and can continuously monitor the patient's breathing state multiple times, reducing the treatment cost of the patient.

[0042] Based on the above embodiments:

[0043] As a preferred embodiment, the first coil 2 is installed on the inner wall away from the opening of the sensor housing.

[0044] The first coil 2 is installed on the inner wall away from the opening of the sensor housing. This structural setting is in the middle of the entire sensor, and the second coil 3 will also be arranged in the middle of the sensor structure along with the position of the first coil 2. It is easier to make the elastic component 1 deform according to the change of the patient's abdomen, making the electromagnetic induction effect between the first coil 2 and the second coil 3 the best and improving the reliability of the solution.

[0045] As a preferred embodiment, the conversion module 4 includes:

[0046] A rectification module, with its input end serving as the input end of the conversion module 4, is used to collect AC signals and rectify them into a second DC signal;

[0047] A current amplification module, with its input end connected to the output end of the rectification module and its output end serving as the output end of the conversion module 4, is used to convert the second DC signal into a first DC signal, and the voltage value of the first DC signal is greater than that of the second DC signal.

[0048] The conversion module 4 is specifically composed of two parts. One part is the rectification module, which rectifies the AC signal collected by the second coil 3 into a second DC signal. The rectification device of this part can be used to convert AC signals into AC signals, but the second DC signal after rectification may not be suitable for the acquisition of the processing module. Therefore, it is necessary to amplify the voltage value of the second DC signal. The second DC signal is converted into a first DC signal through the current amplification module, and the voltage value of the first DC signal is greater than that of the second DC signal, which is suitable for the acquisition of the processing module and improves the reliability of the solution.

[0049] As a preferred embodiment, the rectification module includes: a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first diode D1, a second diode D2, and a first operational amplifier Q1;

[0050] The non-inverting input end of the first operational amplifier Q1 is grounded, and the inverting input end is respectively connected to one end of the first resistor R1, one end of the second resistor R2, and the cathode of the first diode D1. The output end of the first operational amplifier Q1 is respectively connected to the anode and the cathode of the first diode D1. The anode of the second diode D2 is respectively connected to the other end of the second resistor R2 and one end of the third resistor R3. One end of the first resistor R1 is connected to one end of the fourth resistor R4, and the other end of the fourth resistor R4 is connected to the other end of the third resistor R3, and the connected common end serves as the output end of the rectification module.

[0051] The rectification module is composed of a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first diode D1, a second diode D2, and a first operational amplifier Q1. The rectification effect of this structure is good. The two connection points of the power supply of the first operational amplifier Q1 are respectively connected to the +5v power supply and the -5v power supply. Capacitors are also arranged between the power supply and the operational amplifier to filter the signals of the power supply, improving the reliability of the solution.

[0052] As a preferred embodiment, the current amplification module includes: a fifth resistor R5, a sixth resistor R6, and a second operational amplifier Q2;

[0053] The inverting input terminal of the second operational amplifier Q2 is grounded, and the non-inverting input terminal is respectively connected to one end of the fifth resistor R5 and the output terminal of the rectification circuit. The output terminal of the second operational amplifier Q2 is respectively connected to the other end of the fifth resistor R5 and one end of the sixth resistor R6. The other end of the sixth resistor R6 serves as the output terminal of the current amplification module.

[0054] The current amplification module includes the fifth resistor R5, the sixth resistor R6, and the second operational amplifier Q2, which together form a circuit for amplifying electrical signals. The second DC electrical signal output by the rectification module is input into the second operational amplifier Q2. The second operational amplifier Q2 converts the second DC electrical signal into a first DC electrical signal, performing a primary voltage boost so that the voltage value after the boost is suitable for the acquisition by the processing module, improving the feasibility of the solution.

[0055] In addition, the second operational amplifier Q2 can be an operational amplifier for analog operations, that is, it outputs an actual voltage value. The processing module collects the magnitude of this voltage value in real time to determine the patient's breathing state. The second operational amplifier Q2 can also be an operational amplifier for digital operations. A comparator is connected to the output terminal of the digital operational amplifier. One end of the comparator is connected to this operational amplifier, and the other end is connected to a reference voltage. Based on this, a high or low level signal is output to the processing module, and the processing module can determine whether the patient is inhaling or exhaling according to the high or low level, improving the flexibility of the solution.

[0056] As a preferred embodiment, the processing module is a single-chip microcomputer.

[0057] The processing module can be a single-chip microcomputer or other processors with program and logic processing capabilities. The conversion module 4 converts the AC electrical signal into a first DC electrical signal and sends it to the single-chip microcomputer that processes the first DC electrical signal; the single-chip microcomputer is connected to the output terminal of the conversion module 4 and determines the patient's breathing state according to the first DC electrical signal, improving the integrity of the solution.

[0058] As a preferred embodiment, a filter capacitor C is further included. One end of the filter capacitor C is respectively connected to the output terminal of the rectification circuit and one end of the fifth resistor R5, and the other end of the filter capacitor C is respectively connected to the output terminal of the second operational amplifier Q2 and one end of the sixth resistor R6.

[0059] The function of the filter capacitor C is to filter the second DC electrical signal output after the rectification by the rectification module to obtain a smoother and more stable DC electrical signal. When input into the second operational amplifier Q2 later, it can make the second operational amplifier Q2 more accurate when performing voltage amplification, and at the same time protect the second operational amplifier Q2 from being affected by the AC signal, improving the reliability and accuracy.

[0060] As a preferred embodiment, it further includes a seventh resistor R7. One end of the seventh resistor R7 is grounded, and the other end is connected to the input end of the rectification module.

[0061] The connection of the seventh resistor R7 to the input end of the rectification module can make the AC signal output by the second coil 3 more stable, playing a role in filtering and stabilizing the AC signal, so that the stabilized AC signal is input to the rectification module, making the rectification effect of the rectification module better, protecting the rectification module during normal times and preventing it from being damaged due to unstable input AC signal, and improving the reliability of the solution.

[0062] As a preferred embodiment, the processing module is specifically configured to determine that the patient is inhaling when the increased value of the voltage of the first DC signal reaches a preset threshold within a preset time; determine that the patient is exhaling when the decreased value of the voltage of the first DC signal reaches a preset threshold within a preset time; and determine that the patient has stopped breathing when the voltage of the first DC signal remains unchanged within a preset time.

[0063] The breathing state of the patient includes inhalation, exhalation, and apnea. When the patient inhales, the volume of the abdomen increases, causing the elastic member 1 to bulge, and the upper surface of the second coil 3 to be closer to the upper surface of the first coil 2. Therefore, the voltage value collected by the processing module increases at this time. Within a preset time, when the voltage value continuously increases by a certain preset threshold, it indicates that the patient is inhaling. Through the double limitation of the preset time and the preset threshold of the increased voltage value, other behaviors of the patient's body, such as limb movement, will not be misjudged as inhalation. When the patient exhales, the volume of the abdomen decreases, causing the elastic member 1 to concave, and the upper surface of the second coil 3 to be farther from the upper surface of the first coil 2. Therefore, the voltage value collected by the processing module decreases at this time. Within a preset time, when the voltage value continuously decreases by a certain preset threshold, it indicates that the patient is exhaling. Through the double limitation of the preset time and the preset threshold of the decreased voltage value, other behaviors of the patient's body, such as limb movement, will not be misjudged as exhalation. When the voltage of the first DC signal remains unchanged within a preset time, it is determined that the patient has stopped breathing. At this time, after the preset time, the voltage value remains unchanged, indicating that the patient's breathing has stopped, improving the reliability of the solution. At the same time, the entire process is automated, improving the automation level of the solution.

[0064] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0065] Those skilled in the art may further realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of the two. To clearly illustrate the interchangeability of hardware and software, the components and steps of each example have been generally described according to functions in the above description. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention.

Claims

1. A respiratory detection sensor, characterized in that, Comprising: A sensor housing, an elastic member, a first coil, a second coil, and a conversion module disposed inside the sensor housing; The first coil is installed inside the sensor housing and is used for transmitting an electromagnetic signal; One side of the sensor housing is open, and the elastic member is disposed at the opening of the sensor housing; The second coil is installed on the elastic member, and one side of the second coil away from the elastic member is inside the first coil, and the coil diameter of the first coil is larger than the coil diameter of the second coil; The second coil is used for moving inside the first coil along with the deformation of the elastic member, and generating an alternating current signal according to the electromagnetic signal and the mutual inductance between the first coil and the second coil; The input end of the conversion module is connected to one side of the second coil close to the elastic member, and is used for collecting the alternating current signal of the second coil, and converting the alternating current signal into a first direct current signal and sending it to a processing module that processes the first direct current signal; The processing module is connected to the output end of the conversion module, and is used for determining the breathing state of the patient according to the first direct current signal; The conversion module includes: A rectification module, the input end of which is used as the input end of the conversion module, and is used for collecting the alternating current signal and rectifying it into a second direct current signal; A current amplification module, the input end of which is connected to the output end of the rectification module, and the output end of which is used as the output end of the conversion module, and is used for converting the second direct current signal into the first direct current signal, and the voltage value of the first direct current signal is greater than the voltage value of the second direct current signal; The processing module is a single-chip microcomputer; The processing module is specifically configured to determine that the patient inhales when the increased value of the voltage value of the first direct current signal reaches a preset threshold within a preset time; determine that the patient exhales when the decreased value of the voltage value of the first direct current signal reaches a preset threshold within a preset time; and determine that the patient stops breathing when the voltage value of the first direct current signal remains unchanged within a preset time.

2. The respiratory detection sensor according to claim 1, wherein The first coil is installed on the inner wall away from the opening of the sensor housing.

3. The breathing detection sensor according to claim 1, characterized in that, The rectification module includes: a first resistor, a second resistor, a third resistor, a fourth resistor, a first diode, a second diode, and a first operational amplifier; The non-inverting input terminal of the first operational amplifier is grounded, the inverting input terminal is respectively connected to one end of the first resistor, one end of the second resistor, and the cathode of the first diode, the output terminal of the first operational amplifier is respectively connected to the anode and the cathode of the first diode, the anode of the second diode is respectively connected to the other end of the second resistor and one end of the third resistor, one end of the first resistor is connected to one end of the fourth resistor, and the other end of the fourth resistor is connected to the other end of the third resistor, and the connected common terminal is used as the output end of the rectification module.

4. The respiratory detection sensor according to claim 1, wherein The current amplification module includes: a fifth resistor, a sixth resistor, and a second operational amplifier; The inverting input terminal of the second operational amplifier is grounded, and the non-inverting input terminal is respectively connected to one end of the fifth resistor and the output terminal of the rectification module. The output terminal of the second operational amplifier is respectively connected to the other end of the fifth resistor and one end of the sixth resistor, and the other end of the sixth resistor serves as the output terminal of the current amplification module.

5. The respiratory detection sensor according to claim 4, wherein, It further includes a filter capacitor. One end of the filter capacitor is respectively connected to the output terminal of the rectification module and one end of the fifth resistor, and the other end of the filter capacitor is respectively connected to the output terminal of the second operational amplifier and one end of the sixth resistor.

6. The respiratory detection sensor according to claim 1, characterized in that, It further includes a seventh resistor. One end of the seventh resistor is grounded, and the other end is connected to the input terminal of the rectification module.

Images