Pulse oximeter

Abstract

The utility model provides a pulse oximeter. The pulse oximeter comprises a pulse blood oxygen sensor, an automatic adjusting circuit, a signal processing circuit and a displayer. The pulse blood oxygen sensor is used for sensing pulse blood oxygen of a user and outputting a physiological sensing signal related to pulse information and blood oxygen information of the user. The automatic adjusting circuit is coupled to the pulse blood oxygen sensor so as to control the pulse blood oxygen sensor to carry out pulse blood oxygen sensing. The signal processing circuit is coupled to the automatic adjustment circuit to receive an output signal based on the physiological sensing signal and output a feedback signal. The automatic adjusting circuit receives the feedback signal to control the pulse blood oxygen sensor to adjust pulse blood oxygen sensing. Due to the fact that the pulse oximeter is provided with the circuit structure capable of automatically adjusting the circuit, the light attenuation of the pulse oximeter can be adjusted so as to improve the deviation, possibly caused by the light attenuation, of the pulse oximeter sensing result.

Description

Technical Field

[0001] The utility model relates to a pulse oximeter, and particularly to a pulse oximeter with a circuit architecture of an automatic adjustment circuit. Background Art

[0002] The existing pulse oximeter is a non-invasive medical instrument mainly used for measuring the oxygen concentration in blood and the heart rate. These two pieces of data are very important for medical places (such as hospitals, clinics, neonatal medical centers, general nursing homes, elderly welfare institutions, etc.) that need to closely monitor the vital signs of patients. For example, for patients with dyspnea or heart diseases, the change in blood oxygen saturation may be an early warning of the deterioration of the condition. For patients receiving treatment, the pulse oximeter can be used to evaluate the treatment effect. For example, for patients receiving oxygen therapy, the pulse oximeter can be used to determine whether the ideal blood oxygen saturation has been achieved. In emergency situations, such as cardiac arrest or dyspnea, the pulse oximeter can provide medical staff with rapid and accurate vital sign information to help medical staff make appropriate medical decisions. During the operation, doctors need to know the pulse and / or blood oxygen information of the patient at any time to make appropriate medical decisions according to the situation.

[0003] The main advantages of the pulse oximeter are its non-invasiveness and portability. Since blood sampling is not required, it can reduce the unnecessary pain and distress of patients. In addition, due to its small size, it is convenient to carry and use. However, the pulse oximeter also has its disadvantages, and its measurement results may have certain errors. For example, for the components used for pulse oximetry sensing in the pulse oximeter, such as the light emitting unit, the luminous efficiency of the light emitting unit will gradually decrease with the increase of the use time, which may cause the deviation of the measurement result of the pulse oximeter. Summary of the Utility Model

[0004] An object of the utility model is to provide a pulse oximeter with a circuit architecture of an automatic adjustment circuit, which can adjust the pulse oximetry sensing for the attenuation of the optical signal of the pulse oximeter sensor in the pulse oximeter, so as to improve the deviation of the pulse oximetry sensing result caused by the attenuation of the optical signal.

[0005] To achieve the above and other objectives, the present utility model provides a pulse oximeter, comprising: a pulse oximetry sensor, an automatic adjustment circuit, a signal processing circuit, and a display. The pulse oximetry sensor has a sensing control end and a sensing output end, and is used to perform pulse oximetry on a user, and output a physiological sensing signal related to the pulse information and blood oxygen information of the user through the sensing output end. The automatic adjustment circuit has a control output end, a signal input end, a signal output end, and a feedback input end. The control output end of the automatic adjustment circuit is coupled to the sensing control end of the pulse oximetry sensor to control the pulse oximetry sensor to perform pulse oximetry. The signal input end of the automatic adjustment circuit is coupled to the sensing output end of the pulse oximetry sensor. The automatic adjustment circuit outputs an output signal based on the physiological sensing signal through the signal output end. The signal processing circuit is coupled to the signal output end of the automatic adjustment circuit to receive the output signal, and is coupled to the feedback input end of the automatic adjustment circuit to output a feedback signal to the automatic adjustment circuit. The automatic adjustment circuit receives the feedback signal to control the pulse oximetry sensor to adjust the pulse oximetry. The display is coupled to the signal processing circuit for displaying the pulse information and blood oxygen information output by the signal processing circuit.

[0006] In an embodiment of the present utility model, the pulse oximetry sensor includes a light emitting unit, a light receiving unit, and a light signal processing unit. The light emitting unit is coupled to the sensing control end, the light signal processing unit is coupled to the sensing output end, and the light emitting unit and the light receiving unit are respectively disposed on opposite sides of a body part of the user. The light emitting unit is used to emit an incident light to one side of the opposite sides of the body part; the light receiving unit is used to receive a transmitted light corresponding to the incident light from the other side of the opposite sides of the body part and output a corresponding transmitted light intensity value; and the light signal processing unit is electrically connected to the light receiving unit for receiving the transmitted light intensity value and converting the transmitted light intensity value into the physiological sensing signal.

[0007] In an embodiment of the present utility model, the pulse oximetry sensor includes a light emitting unit, a light receiving unit, and a light signal processing unit. The light emitting unit is coupled to the sensing control end, the light signal processing unit is coupled to the sensing output end, and the light emitting unit and the light receiving unit are disposed on the same side of the body part of the user. The light emitting unit is used to emit an incident light, the incident light penetrates the body part and reflects a reflected light; the light receiving unit is used to receive the reflected light and output a reflected light intensity value corresponding to the intensity of the reflected light; and the light signal processing unit is electrically connected to the light receiving unit for receiving the reflected light intensity value and converting the reflected light intensity value into the physiological sensing signal.

[0008] In an embodiment of the present utility model, the pulse oximeter further includes a speaker, which is coupled to the signal processing circuit for playing the voice signals of the pulse information and blood oxygen information output by the signal processing circuit.

[0009] In an embodiment of the present utility model, the pulse oximeter further includes a microphone, which is coupled to the signal processing circuit for voice input or voice control of the pulse oximeter.

[0010] Thus, the pulse oximeter of the present utility model can adjust the pulse oximetry sensing in response to the optical signal attenuation of the pulse oximetry sensor in the pulse oximeter through the circuit architecture with an automatic adjustment circuit, thereby improving the deviation of the pulse oximetry sensing result that may be caused by the optical signal attenuation. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a circuit block diagram of a pulse oximeter in an embodiment of the present utility model.

[0012] Figure 2 is based on Figure 1 a circuit block diagram of an embodiment of the pulse oximetry sensor and the automatic adjustment circuit in the circuit architecture of the pulse oximeter shown.

[0013] Figure 3 is based on Figure 1 a circuit block diagram of another embodiment of the pulse oximetry sensor and the automatic adjustment circuit in the circuit architecture of the pulse oximeter shown.

[0014] Figure 4 is based on Figure 1 a circuit block diagram of an embodiment of the automatic adjustment circuit in the circuit architecture of the pulse oximeter shown.

[0015] Figure 5 is based on Figure 1 a circuit block diagram of another embodiment of the circuit architecture of the pulse oximeter shown.

[0016] Figure 6 is based on Figure 1 a circuit block diagram of yet another embodiment of the circuit architecture of the pulse oximeter shown.

[0017] REFERENCE NUMERALS

[0018] 1, 1A, 1B Pulse oximeter

[0019] 10, 10A, 10B Pulse oximetry sensor

[0020] 11A, 11B Light emitting unit

[0021] 13A, 13B Light receiving unit

[0022] 15A and 15B optical signal processing units

[0023] 20, 20A, 20B, and 20C automatic adjustment circuits

[0024] 21 programmable front-end analog components

[0025] 30 and 30C signal processing circuits

[0026] 31 microcontroller

[0027] 40 display

[0028] 50 speaker

[0029] 60 radio

[0030] Body parts of the BD user

[0031] N11A and N11B sensing control terminals

[0032] N12A and N12B sensing output terminals

[0033] N21A and N21B control output terminals

[0034] N22A and N22B signal input terminals

[0035] N23A and N23B signal output terminals

[0036] N24A and N24B feedback input terminals

[0037] Sout output signal

[0038] Sf feedback signal Detailed implementation manners

[0039] To fully understand the purpose, features, and effects of the present utility model, the present utility model will be described in detail through the following specific embodiments and in conjunction with the accompanying drawings, as follows.

[0040] Please refer to Figure 1 , which is a circuit block diagram of a pulse oximeter in an embodiment of the present utility model. As Figure 1 shown, the pulse oximeter 1 includes: a pulse oximetry sensor 10, an automatic adjustment circuit 20, a signal processing circuit 30, and a display 40.

[0041] A pulse oximeter 10 has a sensing control terminal and a sensing output terminal, and is used to perform pulse oximetry on a body part BD of a user (such as a finger, a foot, or other suitable parts), and outputs a physiological sensing signal related to the pulse information and blood oxygen information of the user through the sensing output terminal. In this embodiment, the pulse oximeter 10 is taken as an example in a non-invasive manner to sense the pulse information and blood oxygen information of the user. The pulse oximeter 10 is, for example, a sensing circuit based on a light emitting unit and a light receiving unit.

[0042] An automatic adjustment circuit 20 has a control output terminal, a signal input terminal, a signal output terminal, and a feedback input terminal. The control output terminal of the automatic adjustment circuit 20 is coupled to the sensing control terminal of the pulse oximeter 10 to control the pulse oximeter 10 to perform pulse oximetry. The signal input terminal of the automatic adjustment circuit 20 is coupled to the sensing output terminal of the pulse oximeter 10. The automatic adjustment circuit 20 outputs an output signal Sout based on the physiological sensing signal through the signal output terminal. The automatic adjustment circuit 20 includes, for example, one or more components, such as an operational amplifier, a comparator, a waveform generator, a digital-to-analog converter, an analog-to-digital converter, or other suitable components; the automatic adjustment circuit 20 can be implemented by a combination of different components as needed. In another example, the automatic adjustment circuit 20 includes programmable analog components, such as a programmable front-end analog component, which includes an operational amplifier, a comparator, a waveform generator, a digital-to-analog converter, and / or an analog-to-digital converter.

[0043] A signal processing circuit 30 is coupled to the signal output terminal of the automatic adjustment circuit 20 to receive the output signal Sout, and is coupled to the feedback input terminal of the automatic adjustment circuit 20 to output a feedback signal Sf to the automatic adjustment circuit 20, wherein the automatic adjustment circuit 20 receives the feedback signal Sf to control the pulse oximeter 10 to perform adjusted pulse oximetry. In addition, for example, the signal processing circuit 30 is configured to be able to output the pulse information and blood oxygen information of the user according to the result of the pulse oximetry. The signal processing circuit 30 is, for example, a digital signal processor, a microcontroller, a digital control circuit, or other suitable signal processing circuits.

[0044] A display 40 is coupled to the signal processing circuit 30 for displaying the pulse information and blood oxygen information output by the signal processing circuit 30. The display 40 is, for example, a liquid crystal display, an organic light emitting diode display, or other suitable displays.

[0045] As Figure 1As shown, the pulse oximeter 1 has a circuit architecture with an automatic adjustment circuit. Through this circuit architecture, the pulse oximeter 1 can adjust pulse oximetry sensing for the optical signal attenuation of the pulse oximetry sensor in the pulse oximeter, thereby being able to improve the deviation of the pulse oximetry sensing result that may be caused by the optical signal attenuation.

[0046] Based on the following Figure 1 circuit architecture of the shown pulse oximeter, multiple different embodiments are proposed.

[0047] Please refer to Figure 2 , which is a circuit block diagram of an embodiment of the pulse oximetry sensor and the automatic adjustment circuit in the circuit architecture of the shown pulse oximeter. As Figure 1 shown, the pulse oximetry sensor 10A and the automatic adjustment circuit 20A are respectively Figure 2 embodiments of the pulse oximetry sensor 10 and the automatic adjustment circuit 20 in Figure 1 .

[0048] The pulse oximetry sensor 10A includes a light emitting unit 11A, a light receiving unit 13A, and a light signal processing unit 15A. The light emitting unit 11A is coupled to the sensing control terminal N11A of the pulse oximetry sensor 10A, and the light signal processing unit 15A is coupled to the sensing output terminal N12A of the pulse oximetry sensor 10A. The light emitting unit 11A and the light receiving unit 13A are respectively disposed on opposite sides of a body part BD (such as a finger) of the user. The light emitting unit 11A is used to emit an incident light to one side of the opposite sides of the body part. The light receiving unit 13A is used to receive a transmitted light corresponding to the incident light from the other side of the opposite sides of the body part and output a corresponding transmitted light intensity value. The light signal processing unit 15A is electrically connected to the light receiving unit 13A to receive the transmitted light intensity value and convert the transmitted light intensity value into a physiological sensing signal related to the pulse information and blood oxygen information of the user. Among them, the light emitting unit 11A may include a red light emitting diode, an infrared light emitting diode, or a combination of both.

[0049] The automatic adjustment circuit 20A has a control output terminal N21A, a signal input terminal N22A, a signal output terminal N23A, and a feedback input terminal N24A. The control output terminal N21A of the automatic adjustment circuit 20A is coupled to the sensing control terminal N11A of the pulse oximetry sensor 10A to control the pulse oximetry sensor 10A to perform pulse oximetry sensing. The signal input terminal N22A of the automatic adjustment circuit 20A is coupled to the sensing output terminal N12A of the pulse oximetry sensor 10A.

[0050] The automatic adjustment circuit 20A outputs an output signal Sout based on the physiological sensing signal through the signal output terminal N23A, and receives a feedback signal Sf through the feedback input terminal N24A. The automatic adjustment circuit 20A can control the pulse oximeter 10A to perform pulse oximetry sensing. The automatic adjustment circuit 20A can also be used to receive the feedback signal Sf to control the pulse oximeter 10 to adjust the pulse oximetry sensing.

[0051] Please refer to Figure 3 , which is based on Figure 1 shown in the circuit block diagram of another embodiment of the pulse oximeter and the automatic adjustment circuit in the circuit architecture. As Figure 3 shown, the pulse oximeter 10B and the automatic adjustment circuit 20B are respectively Figure 1 the embodiments of the pulse oximeter 10 and the automatic adjustment circuit 20 in

[0052] The pulse oximeter 10 includes a light emitting unit 11B, a light receiving unit 13B, and a light signal processing unit 15B. The light emitting unit 11B is coupled to the sensing control terminal N11B of the pulse oximeter 10B, and the light signal processing unit 15B is coupled to the sensing output terminal N12B of the pulse oximeter 10B. The light emitting unit 11B and the light receiving unit 13B are disposed on the same side of the body part BD (such as a finger) of the user. The light emitting unit 11B is used to emit an incident light, which penetrates the body part BD and reflects a reflected light; the light receiving unit 13B is used to receive the reflected light and output a reflected light intensity value corresponding to the intensity of the reflected light. The light signal processing unit 15B is electrically connected to the light receiving unit 13B to receive the reflected light intensity value and convert the reflected light intensity value into a physiological sensing signal related to the pulse information and blood oxygen information of the user. Among them, the light emitting unit 11B may include a red light emitting diode, an infrared light emitting diode, or a combination of both.

[0053] The automatic adjustment circuit 20B has a control output terminal N21B, a signal input terminal N22B, a signal output terminal N23B, and a feedback input terminal N24B. The control output terminal N21B of the automatic adjustment circuit 20B is coupled to the sensing control terminal N11B of the pulse oximeter 10B to control the pulse oximeter 10B to perform pulse oximetry sensing. The signal input terminal N22B of the automatic adjustment circuit 20B is coupled to the sensing output terminal N12B of the pulse oximeter 10B.

[0054] The automatic adjustment circuit 20B outputs an output signal Sout based on the physiological sensing signal through the signal output terminal N23B, and receives a feedback signal Sf through the feedback input terminal N24B. The automatic adjustment circuit 20B can control the pulse oximeter 10B to perform pulse oximetry. The automatic adjustment circuit 20B can also be used to receive the feedback signal Sf to control the pulse oximeter 10 to adjust the pulse oximetry, so as to improve the influence caused by the fact that the luminous efficacy of the light emitting unit 11B gradually decreases as the usage time increases.

[0055] Since the artery inside the body part BD of the user will have periodic changes in artery diameter due to the different blood ejection volumes of the heart during contraction and relaxation, therefore, the transmitted light intensity value or the reflected light intensity value transmitted from the body part BD will have corresponding intensity changes according to the size of the blood flow, and then be received by the light receiving unit (such as 13A or 13B), and further obtain the pulse information of the user; in addition, different blood oxygen contents (and blood oxygen) in the blood have different absorption degrees for light of a specific wavelength, so the transmitted light intensity value or the reflected light intensity value transmitted from the body part BD will have corresponding intensity changes according to the different blood oxygen levels, and then be received by the light receiving unit (such as 13A or 13B), and further obtain the blood oxygen information of the user.

[0056] Thus, according to the applicable application range, based on Figure 2 the pulse oximeter in Figure 3 (which can be called a transmissive pulse oximeter) or

[0057] the pulse oximeter in Figure 1The circuit architecture adopts an automatic adjustment circuit and forms a feedback circuit architecture with the signal processing circuit, enabling the pulse oximeter to improve the impact of the optical attenuation of the light emitting unit (such as 11A or 11B) on the measurement results of the pulse oximeter. The automatic adjustment circuit, for example, includes a circuit for driving the light emitting unit, which can generate drive signals (such as current signals) with different intensities to drive the light emitting unit to emit light signals with different intensities, so as to reduce or enhance the signal of the light signal (such as the transmitted light or reflected light) received by the light receiving unit. For example, the automatic adjustment circuit (20, 20A or 20B) controls the output terminal (such as N21A or N21B) to output a first drive signal (such as an initial current signal) to drive the light emitting unit (such as 11A or 11B) for the first pulse oximetry sensing. Then, the automatic adjustment circuit controls the output terminal (such as N21A or N21B) to output a second drive signal (such as a current signal with an increment added to the initial current signal) to drive the light emitting unit (such as 11A or 11B) for the second pulse oximetry sensing. In addition, in response to the first pulse oximetry sensing and the second pulse oximetry sensing, the automatic adjustment circuit respectively receives a first physiological sensing signal and a second physiological sensing signal generated by the optical signal processing unit (such as 15A or 15B). The automatic adjustment circuit, for example, is directly or after adjustment based on the first physiological sensing signal and the second physiological sensing signal and outputs to the signal processing circuit (such as 30). The signal processing circuit, for example, calculates the result of dividing a target value by the difference between the second physiological sensing signal and the first physiological sensing signal to obtain an adjustment parameter. The signal processing circuit outputs a feedback signal Sf representing the adjustment parameter. After receiving the feedback signal Sf, the automatic adjustment circuit 20A generates an adjusted drive signal based on the feedback signal Sf to drive the light emitting unit (such as 11A or 11B) for adjusted pulse oximetry sensing, where the adjusted drive signal is, for example, a current signal based on the adjustment parameter, and its amplitude or magnitude is a multiple of the difference between the second drive signal and the first drive signal. In some usage scenarios, even if the light emitting unit (such as 11A or 11B) has been affected by optical attenuation and exhibits weak luminous efficiency, due to the pulse oximeter according to the embodiments of the present invention adopting a feedback circuit architecture formed by an automatic adjustment circuit and a signal processing circuit, it can automatically (or adaptively) adjust the magnitude of the drive signal for driving the light emitting unit, enabling the pulse oximeter to improve the impact of the optical attenuation of the light emitting unit (such as 11A or 11B) on the pulse oximetry sensing results.

[0058] In this way, since the pulse oximeter of the embodiment of the present utility model adopts a feedback circuit architecture, it can adaptively and automatically adjust pulse oximetry sensing, so that the result of pulse oximetry sensing can be obtained quickly. In addition, the automatic adjustment operation complexity of the above circuit architecture is low, so the sensing response is fast. For example, it can complete the first pulse oximetry sensing to the adjusted pulse oximetry sensing, obtain the pulse oximetry sensing result and present it within only 2 seconds, 1.5 seconds or 1 second. Therefore, the power consumed by pulse oximetry sensing is relatively small, so the embodiment of the present utility model can also achieve the effect of energy saving.

[0059] Please refer to Figure 4 , which is a circuit block diagram of an embodiment of an automatic adjustment circuit in the circuit architecture of the pulse oximeter shown in Figure 1 . In Figure 4 , the automatic adjustment circuit 20C includes a programmable front-end analog element 21, and the signal processing circuit 30C includes a microcontroller 31. The programmable front-end analog element 21 has a plurality of interface paths for electrically coupling with the microcontroller 31 (or the pulse oximeter 10). The programmable front-end analog element 21 is signal-connected to the microcontroller 31 through a plurality of interface paths, for example, by outputting an output signal Sout to the microcontroller 31 and receiving a feedback signal Sf from the microcontroller 31. The automatic adjustment circuit 20C and the signal processing circuit 30C are respectively Figure 1 embodiments of the automatic adjustment circuit 20 and the signal processing circuit 30, and can be applied to corresponding elements in other embodiments (such as Figure 2 , Figure 3 , Figure 5 or Figure 6 corresponding embodiments).

[0060] Please refer to Figure 5 , which is a circuit block diagram of another embodiment of the circuit architecture of the pulse oximeter shown in Figure 1 . Compared with Figure 1 of the pulse oximeter 1, Figure 5 of the pulse oximeter 1A shown also includes a speaker 50, and the signal processing circuit 30 is configured to be able to output voice signals of pulse information and blood oxygen information according to the result of pulse oximetry sensing. The speaker 50 is coupled to the signal processing circuit 30 for playing the voice signals of the pulse information and the blood oxygen information output by the signal processing circuit 30. In this way, medical staff can directly listen to the pulse information and the blood oxygen information about the patient broadcast through the speaker, so that medical staff can be more focused on medical operations (such as surgery) and have a positive benefit.

[0061] Please refer to Figure 6 , which is a circuit block diagram of another embodiment of the circuit architecture of the pulse oximeter shown in Figure 1 . Compared with Figure 5pulse oximeter 1A, Figure 6 The pulse oximeter 1B shown also includes a microphone 60. The microphone 60 is coupled to the signal processing circuit 30 for voice input or voice control of the pulse oximeter. For example, the signal processing circuit 30 is configured to convert the audio signal received by the microphone 60 into an instruction for controlling the pulse oximeter (such as turning on or off the voice playback of pulse information and blood oxygen information) or other operations of the pulse oximeter.

[0062] For example, the microphone 60 is an electric microphone electrically connected to the signal processing circuit 30, enabling the operator to operate the pulse oximeter 1B by voice control. For instance, the operator's voice can be pre-recorded and stored in a storage element (not shown) within the signal processing circuit 30, or the signal processing circuit 30 can analyze the voice received by the microphone 60 to parse out control instructions. The aforementioned operation processes all generate a voice control signal based on the external voice received (emitted by the user). For example, the voice control signal causes the signal processing circuit 30 to enter an operation mode for pulse oximetry sensing or causes the signal processing circuit 30 to enter a low power consumption mode (or sleep mode). Thus, the pulse oximeter 1B can be directly awakened or put to sleep by medical staff or other operators in a voice control manner, thereby providing a more diverse and convenient usage method.

[0063] In summary, the pulse oximeter of the present utility model, through a circuit architecture with an automatic adjustment circuit, can adjust pulse oximetry sensing for the optical signal attenuation of the pulse oximetry sensor in the pulse oximeter, thereby being able to improve the deviation of the pulse oximetry sensing result that may be caused by optical signal attenuation.

[0064] The present utility model has been disclosed in multiple embodiments above. However, those skilled in the art should understand that these embodiments are only used to illustrate the present utility model and should not be construed as limiting the scope of the present utility model. It should be noted that all equivalent changes and substitutions to these embodiments should be considered as falling within the scope of the present utility model. Therefore, the protection scope of the present utility model shall be defined by the scope of the patent application.

Claims

1. A pulse oximeter, characterized in that, Comprising: A pulse oximeter having a sensing control terminal and a sensing output terminal, and being configured to perform pulse oximetry on a user and output a physiological sensing signal related to the pulse information and blood oxygen information of the user through the sensing output terminal; An automatic adjustment circuit having a control output terminal, a signal input terminal, a signal output terminal, and a feedback input terminal. The control output terminal of the automatic adjustment circuit is coupled to the sensing control terminal of the pulse oximeter to control the pulse oximeter to perform pulse oximetry. The signal input terminal of the automatic adjustment circuit is coupled to the sensing output terminal of the pulse oximeter, and the automatic adjustment circuit outputs an output signal based on the physiological sensing signal through the signal output terminal; A signal processing circuit coupled to the signal output terminal of the automatic adjustment circuit to receive the output signal and coupled to the feedback input terminal of the automatic adjustment circuit to output a feedback signal to the automatic adjustment circuit, wherein the automatic adjustment circuit receives the feedback signal to control the pulse oximeter to adjust the pulse oximetry; And A display coupled to the signal processing circuit for displaying the pulse information and blood oxygen information output by the signal processing circuit.

2. The pulse oximeter according to claim 1, wherein, The pulse oximeter includes a light emitting unit, a light receiving unit, and a light signal processing unit. The light emitting unit is coupled to the sensing control terminal, and the light signal processing unit is coupled to the sensing output terminal. The light emitting unit and the light receiving unit are respectively disposed on opposite sides of a body part of the user, wherein The light emitting unit is configured to emit an incident light to one of the opposite sides of the body part; The light receiving unit is configured to receive a transmitted light corresponding to the incident light from the other of the opposite sides of the body part and output a corresponding transmitted light intensity value; And The light signal processing unit is electrically connected to the light receiving unit for receiving the transmitted light intensity value and converting the transmitted light intensity value into the physiological sensing signal.

3. The pulse oximeter according to claim 2, wherein The light emitting unit includes a red light emitting diode, an infrared light emitting diode, or a combination thereof.

4. The pulse oximeter according to claim 1, wherein The pulse oximeter includes a light emitting unit, a light receiving unit, and a light signal processing unit. The light emitting unit is coupled to the sensing control terminal, and the light signal processing unit is coupled to the sensing output terminal. The light emitting unit and the light receiving unit are disposed on the same side of a body part of the user, wherein The light emitting unit is configured to emit an incident light that penetrates the body part and reflects a reflected light; The light receiving unit is configured to receive the reflected light and output a reflected light intensity value corresponding to the intensity of the reflected light; And The light signal processing unit is electrically connected to the light receiving unit for receiving the reflected light intensity value and converting the reflected light intensity value into the physiological sensing signal.

5. The pulse oximeter according to claim 4, wherein, The light emitting unit includes a red light emitting diode, an infrared light emitting diode, or a combination thereof.

6. The pulse oximeter according to any one of claims 1 to 5, characterized in that, Further comprising: A speaker coupled to the signal processing circuit for playing a voice signal of the pulse information and blood oxygen information output by the signal processing circuit.

7. The pulse oximeter according to any one of claims 1 to 5, characterized in that, Further comprising: a microphone, coupled to the signal processing circuit, for performing voice input or voice control on the pulse oximeter.

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