WO2009065270A1

WO2009065270A1 - Finger-clip oximeter representing measured value by audio tone

Info

Publication number: WO2009065270A1
Application number: PCT/CN2007/071103
Authority: WO
Inventors: Feng Xu; Houcheng Su
Original assignee: Beijing Choice Electronic Technology Co., Ltd.
Priority date: 2007-11-21
Filing date: 2007-11-21
Publication date: 2009-05-28
Also published as: CN101842050A; CN101842050B

Abstract

A finger-clip oximeter which can represent the measured value by audio tone, has an audio-processor. The finger-clip oximeter has an AC buzzer. The audio control circuit of the buzzer includes: a MOS field effect transistor (TR6), with a coupling capacitor (C28) connected in series between its gate (1) and an output port (P0.5) of a central processing unit (CPU); a current limiting resistor (R42) and a pull-up resistor (R44), arranged between the gate (1) and the source (2) of the MOS field effect transistor (TR6); a Schottky diode (D4), connected parallel with the pull-up resistor (R44); a capacitor (C5), connected to the source (2) of the MOS field effect transistor (TR6); and a buzzer (B1), connected to the drain (3) of the MOS field effect transistor (TR6).

Description

A finger clip oximeter that can represent measured values by pronunciation tones

[1] or

[2] The present invention relates to a finger oximeter capable of expressing a measured value by a pronunciation tone for detecting blood oxygen saturation in blood.

[3]

[4] Oxygen saturation is a percentage of the amount of oxygen-bound hemoglobin in the blood that accounts for all oxygen-binding hemoglobin and is an important physiological indicator of the human body.

[5] The oximeters on the market can be divided into two categories, one is the clinical monitor. These large oximeters provide dynamic audible alarms, image display, etc. Circuits such as frequency conversion and op amp are more complicated; the other is portable oximeters, such as finger oximeters. Most of these oximeters do not use buzzers, and do not have an audible alarm function. Only some manufacturers With the DC buzzer, the pitch control cannot be performed.

[6] In particular, the portable fingertip oximeter is small in size and the display area of the screen is small, so the observation value is not as convenient as that of a large-scale device. Therefore, it is necessary to realize the measurement result according to the different pulse rate on the finger oximeter. The function is to facilitate the doctor to understand the patient's blood oxygenation changes.

[7] Coffee

[8] An object of the present invention is to provide a finger oximeter capable of expressing a measured value by a pronunciation tone, which has an AC buzzer, and the pronunciation frequency and pronunciation tone of the buzzer can respectively indicate the pulse frequency and blood. The measurement of oxygen saturation is simple, easy to use, and low in power consumption.

[9] Another object of the present invention is to provide a finger oximeter capable of expressing a measured value by a pronunciation tone, the pronunciation frequency of which is consistent with the pulse wave frequency, and the beat frequency and variation of the pulse rate can be known without looking at the value.

[10] Another object of the present invention is to provide a finger oximeter capable of expressing a measured value by a pronunciation tone, the pitch of which is related to the measured value of blood oxygen saturation, and if the measured value is high, the frequency is high. The sound is sharper. If the measured value is lowered, the frequency is low, and the sound is boring. You can know the trend of the blood oxygen measurement without looking at the value. [11] Another object of the present invention is to provide a finger oximeter capable of indicating a measured value by a voicing tone, the alarm 吋 stopping the pulse sound utterance.

[12] To this end, the present invention provides a finger oximeter capable of expressing a measured value by a pronunciation tone, having an audio processor, characterized in that the finger oximeter has an AC buzzer, the communication The audio control circuit of the buzzer comprises: a MOS field effect transistor TR6, a coupling capacitor C28 is connected in series between the gate 1 and the output port P0.5 of the central processing unit CPU; a current limiting resistor R42 and a pull-up resistor R44, It is disposed between the gate 1 and the source 2 of the MO S field effect transistor TR6; the Schottky diode D4 is connected in parallel with the pull-up resistor R44; and the capacitor C5 is connected to the source 2 of the MOS field effect transistor TR6; And a buzzer Bl connected to the drain 3 of the MOS field effect transistor TR6.

[13] Preferably, the frequency of the pronunciation is controlled by software.

[14] Preferably, the audio processor controls the pronunciation frequency and pronunciation tone of the buzzer B1 by generating a PWM wave.

, correlates the vocalization of buzzer B1 with the frequency of the pulse and the measurement of blood oxygen saturation.

[15] Preferably, the pronunciation frequency is consistent with the pulse rate.

[16] Preferably, the pitch of the pronunciation is related to the measurement of blood oxygen saturation, and if the measured value is high, the frequency is increased.

, the sound is sharp; if the measured value is low, the frequency is lowered, and the sound is dull.

[17] Preferably, when the measured value of blood oxygen saturation is below a threshold value, the buzzer B1 issues an alarm and stops the pulse sound.

[18] Preferably, the buzzer B1 is a low power AC buzzer.

[19] Preferably, the capacitor C5 is a voltage stabilizing capacitor.

[20] The control circuit used in the invention is relatively simple, and is directly controlled by the I/O port of the CPU, and the frequency of the pronunciation is controlled by software; the voltage is stabilized by the voltage stabilizing capacitor, and the power consumption is reduced; AC buzzer. This achieves miniaturization of the horn system.

[21] a m

1 is a schematic structural view of a finger grip oximeter having a buzzer according to the prior art.

2 is an audio control circuit diagram of a finger oximeter with an AC buzzer in accordance with the present invention.

[24] t ^

[25] As shown in FIG. 1, a finger oximeter with a buzzer according to the prior art generally includes: a probe that can be clamped to a finger by a known structure; a central processing unit CPU connected to the probe ; audio control The circuit is connected to the output port P0.5 of the central processing unit CPU; the buzzer B1 is controlled by the audio control circuit; the central processing unit CPU includes three units of a heartbeat algorithm, a saturation algorithm and an audio processor, wherein Run the corresponding program in the audio processor to control the frequency and tone of the buzzer B1.

2 is an audio control circuit diagram of a finger grip oximeter with an AC buzzer, in accordance with one embodiment of the present invention. As shown in FIG. 2, the audio control circuit includes: a MOS field effect transistor TR6 having a capacitor C28 coupled in series between its gate 1 and an output port P0.5 of the central processing unit CPU; a current limiting resistor R42 and a pull-up resistor _R44 , which is disposed between the gate 1 and the source 2 of the MOS field effect transistor TR6; the Schottky diode D4 is connected in parallel with the pull-up resistor R44; and the capacitor C5 is connected to the source 2 of the MOS field effect transistor TR6; The buzzer Bl is connected to the drain 3 of the MOS field effect transistor TR6. The output port P0.5 is a control port, which can control the switch of the buzzer B1. When the output port P0.5 is given a high level, the MOS field effect transistor T R6 is turned off, the buzzer B1 does not sound; when the output port P0. 5 gives a low level, the MOS field effect transistor TR 6 is turned on, and the buzzer B1 sounds. The audio processor in the CPU of the central processing unit generates a PWM wave, and controls the pronunciation frequency and pronunciation tone of the buzzer B1 through the output port P0.5, so that the sound of the buzzer B1 and the pulse frequency and blood oxygen saturation are measured. The values are associated, wherein the pronunciation frequency is consistent with the pulse rate, and the pitch of the pronunciation is associated with the measurement of blood oxygen saturation. If the measured value is high, the frequency will increase and the sound will be sharp; if the measured value is low, the frequency will decrease and the sound will be dull. In actual use, when the measured value of blood oxygen saturation is lower than a threshold value, the buzzer B1 will give an alarm and stop the sound of the pulse sound.

[27] The buzzer B1 in Figure 2 is a low-power AC buzzer, and the capacitor C5 is a voltage-stabilizing capacitor, which can store a part of the power, which can solve the excessive power of the buzzer B1, resulting in unstable voltage. problem.

[28] In summary, in the above embodiment, P0.5 is the output control port of the CPU (the CPU can capture various models), the control signal is given by the CPU, P0.5 is given to the high level, and the MOS transistor TR6 Off, buzzer B1 does not sound, P0.5 gives low level, MOS tube TR6 turns on, buzzer B1 sounds. The function of capacitor C5 is to store a part of the power, which can solve the problem that the power of the speaker is too large and the voltage is unstable. P0.5 is used as the control port to control the switch of the speaker, and can also control the buzz by sending PWM waves. The pitch frequency of the sound. The tone of the pronunciation can be correlated with the measurement of blood oxygen saturation. B1 is a low-power AC buzzer that can realize PWM wave control and tone modulation. R42 is a current limiting resistor and R 44 is a pull-up resistor.

[29] Therefore, the present invention discloses a finger oximeter with an AC buzzer, the finger oximeter has The circuit has the advantages of simple structure and low power consumption. Similarly, the buzzer can be used to understand the pulse and oxygen saturation information of the human body. The value of the blood oxygen measurement value can be known without looking at the value, so the use is simple. Convenience.

Claims

Claim

1 . A finger clip oximeter capable of expressing a measured value by a pronunciation tone, having an audio processor, wherein the finger oximeter has an AC buzzer, and the audio control circuit of the AC buzzer Includes:

MOS field effect transistor TR6, a coupling capacitor C28 is connected in series between its gate 1 and the output port P0.5 of the central processing unit CPU;

a current limiting resistor R42 and a pull-up resistor R44 disposed between the gate 1 and the source 2 of the MOS field effect transistor TR6;

Schottky diode D4, which is connected in parallel with pull-up resistor R44;

A capacitor C5 is connected to the source 2 of the MOS field effect transistor TR6, and a buzzer Bl is connected to the drain 3 of the MOS field effect transistor TR6.

2. The finger oximeter according to claim 1, wherein the frequency of pronunciation is controlled by software

3. The finger oximeter according to claim 1, wherein the audio processor controls the sounding frequency and the pronunciation tone of the buzzer B1 by generating a PW M wave, so that the buzzer B1 is audible and pulsed. The frequency is correlated with the measurement of blood oxygen saturation.

4. The finger oximeter of claim 3, wherein the pronunciation frequency is consistent with the pulse rate.

5. The finger oximeter according to claim 3, wherein the tone of the pronunciation is associated with the measurement of blood oxygen saturation, and if the measurement value is high, the frequency is increased, the sound is sharp; if the measurement value is low, The frequency is reduced and the sound is dull.

6. The finger oximeter of claim 3, wherein when the blood oxygen saturation measurement is below a threshold value, the buzzer B1 issues an alarm and stops the pulse sound.

7. The finger oximeter of claim 1, wherein the buzzer B1 is a low power AC buzzer.

8. The finger oximeter of claim 1, wherein the capacitor C5 is a voltage stabilizing capacitor.