JPS6040036A - Hemomanometer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] (b) Field of invention The present invention relates to a blood pressure needle equipped with a microphone.

(b) Prior art and its problems In general, a blood pressure needle has an electronic circuit built into its main body, a blood pressure display section, etc., and a cuff connected to this main body via an air tube. Some devices are configured to pressurize the inside of the cuff with a pressurizing bulb, gradually reduce the pressure, detect the cuff pressure, simultaneously detect Korotkoff sounds, and display the systolic blood pressure and diastolic blood pressure.

This blood pressure needle is configured so that the Korotkoff sound is detected by a microphone provided in the cuff or the main body. This microphone must have a certain level of sensitivity; if the sensitivity is too low, it will not be able to detect Korotkoff sounds, and if it is too sensitive, it will detect noise other than Korotkoff sounds. However, accurate blood pressure measurements cannot be performed.

Therefore, since it is necessary to perform a performance test on the microphone, conventionally, the microphone has been assembled or incorporated into a meter and then tested using a separate test device. However, this requires a separate device and has the problem of requiring time and effort for inspection.

In addition, separate equipment is used to check for disconnections in microphone lead wires, and there is a possibility of erroneous measurements when the test is not performed, resulting in low reliability.

(c) Purpose of the invention This invention has been made in view of the above points, and by providing a self-check function that automatically detects abnormalities in the microphone, it is possible to quickly and easily check for abnormalities in the microphone system. The object of the present invention is to provide a blood pressure monitor with a

(d) Structure and effect of the invention In order to achieve the above-mentioned object, this invention has a main body,
A cuff connected to the main body, a cuff pressure detection means for detecting the pressure within the cuff, a microphone for sensing Korotkoff sounds, and a blood pressure determination means for determining blood pressure based on signals from the cuff pressure detection means and the microphone. , a sound generator that emits a check sound for the microphone, and oscillation means that sequentially oscillates signals of different frequencies and inputs them to the sound generator;
a sound pressure control means for controlling the check sound to a minimum sound pressure and a maximum sound pressure of a predetermined level for each frequency; a first discriminating means for discriminating and emitting an abnormal signal when detected; and a second discriminating means for discriminating whether or not the microbon detects the check sound when the highest sound pressure check sound is generated, and emitting an abnormal signal when the check sound is not detected. It consists of a discriminating means.

Therefore, according to the blood pressure monitor of this invention, it is possible to directly test the sensitivity of the microphone, etc. with the instrument itself.
This can be done quickly and easily without any effort.

Furthermore, since inspection can be easily performed one after another, the reliability of measurement is improved, and at the same time, it is also possible to check for breakage of lead wires, so that erroneous measurements can be reliably prevented.

(E) Description of Embodiments Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

<Example 1> This example is shown in FIGS. 1 to 5, in which 1 is a blood pressure monitor, a cuff 3 is connected to a main body 2 via an air pipe 4,
The cuff 3 has a built-in microphone 5 and is configured as a cuff with a microphone.

The main body 2 houses various electronic circuits and the like in a housing 2a, and has a blood pressure display section 6 that displays systolic blood pressure and diastolic blood pressure on the front, a power switch 7, a check switch 8 that checks the microphone 5, and a check result of the microphone 5. A check display section 9 for displaying the information is provided. The check display section 9 is composed of a normality display lamp 9a and an abnormality display lamp 9b.

On the other hand, the cuff 3 is made up of a rubber bag 3b housed inside a cloth bag 3a, and the rubber bag 3b is connected to the main body 2 via an air pipe 4. It is connected to pressure bulb lO.

This cuff 3 is wrapped around the arm of the person to be measured, and a pressure ball 10 pressurizes the rubber bag 3b to prevent blood flow.

Further, a microphone 5 for sensing Korotkoff sound is provided between the cloth bag 3a and the rubber bag 3b of the cuff 3, and this microphone 5 is connected to a microphone jack 12 attached to the main body 2 via a lead wire 11. ing.

Further, a sound generator 13 for checking the microphone 5 is attached to the main body housing 2a. In other words,
A recess 2b corresponding to the microphone 5 is formed in the upper part of the housing 2a, and an opening 2c is bored in this recess 2b.
Facing this opening 2c, a sound generator 13 is attached to the housing 2a via a support plate 14 with screws 15. When the microphone 5 is engaged with this recess 2b via the cloth bag 3a, it comes into close contact with a sound generator 13, which is connected to an amplifier 16.

FIG. 3 shows an electronic circuit block diagram of this blood pressure monitor 1, in which a blood pressure measurement system 17a and a microphone 5 for measuring blood pressure are shown.
and a check system 17b for checking.

This blood pressure measurement system 17a measures blood pressure using the pressure inside the cuff 3 and the Korotkoff sound, and the detection signal of the cuff pressure detector 18 (cuff pressure detection means) consisting of a pressure sensor etc. is as follows.
The pulse wave signal is input to an A/D converter 19 and converted into a digital signal, while the pulse wave signal is input to an AND circuit 21 via a pulse wave filter 20. The digital signal of this A/D converter 19 and the output signal of the AND circuit 21 are c
The blood pressure value is input to a blood pressure determining circuit 22 (blood pressure determining means) comprising a PU, a memory, etc., and the blood pressure value is displayed on the blood pressure display section 6 based on the output signal of this determining circuit 22.

On the other hand, an output signal corresponding to the Korotkoff sound sensed by the microphone 5 is input to the AND circuit 21 via the bandpass filter 23 and the comparator 24.

Therefore, after wrapping the cuff 3 around the subject's arm and applying pressure,
The pressure inside the cuff 3 is detected by the detector 18 while the pressure is gradually reduced, and at the same time, the Korotkoff sound is sensed by the microphone 5. When the pulse wave signal from the cuff pressure detector 18 and the Korotkoff sound signal from the microphone 5 are input to the AND circuit 21, the AND circuit 21 outputs an output, and in response to the generation and disappearance of this output, the blood pressure determination circuit 22, the systolic blood pressure and diastolic blood pressure are determined and displayed on the display unit 6.

The check system 17b is configured such that a control circuit 25 consisting of a CPU, a memory, etc. operates when the check switch 8 is turned on, and outputs a signal to the variable frequency oscillator 26 and the variable amplifier 16. And this control circuit 2
5 receives a signal from the microphone 5 via a comparator 24, and outputs a normal or abnormal signal to the check display section 9.

Further, the amplifier 16 is connected to the sound generator 13, and the oscillator 26
The microphone 5 is configured to emit a plurality of check sounds having different frequencies according to the signals of the microphone 5. Furthermore, the control circuit 25 is equipped with a sound pressure control means for controlling the minimum sound pressure and maximum sound pressure check sounds at predetermined levels for each frequency. The sound generator 13 emits a check sound with the highest sound pressure.

The relationship between the frequency and sound pressure of this check sound is shown in FIG.
n(fi) and the maximum sound pressure Pmax(fi) are determined.

In addition, in FIG. 3, the blood pressure determination circuit 22 and the control circuit 25
Although shown as separate blocks, it is composed of one CPU, memory, etc.

Next, the checking operation and configuration of the microphone 5 will be explained based on the control flow shown in FIG.

First, as shown in FIG. 2, the microphone 5 is placed in the recess 2b of the main body housing 2a and brought into close contact with the sound generator 13, and the check switch 8 is turned on to start the check operation.

Then, in step (hereinafter referred to as ST) 1, the oscillator 26 is set to the lowest frequency, and then Sr
1, the lowest sound pressure Pm1n at that frequency fO
The amplifier 16 is set at (fo), and the oscillator 13 emits a check sound.

Then, Sr
1 (first determining means). When the comparator 24 outputs an output, the determination of Sr1 becomes YES, and the process moves to Sr4, and the abnormality display lamp 9b lights up. That is,
Since the sensitivity of the microphone 5 is so high that noises other than Korotkoff sounds are detected, a defective item is displayed.

On the other hand, when the comparator 24 does not output, the judgment of Sr3 becomes No and the process moves to Sr5, and the next slightly higher frequency f
1 is set in the oscillator 26, and its frequency f1 is set in Sr6.
The amplifier 16 is applied to the lowest sound pressure p m i n (fl) at
is set and a check tone is emitted.

Then, in the same manner as described above, whether or not the microphone 5 has sensed the signal is determined in Sr7 based on the presence or absence of the output of the comparator 24 (first determining means), and when the output is detected, the determination becomes YES and the process moves to Sr1 to display an abnormality.

Conversely, if there is no output, the determination of Sr7 becomes No, and Sr7
Moving on to r1, the highest sound pressure Pma at that frequency f1
The amplifier 16 is set at x(fl) and a check sound is generated. Then, the process moves to Sr1, and it is determined whether or not the comparator 24 outputs an output (second determining means). When this comparator 24 is not outputting, the microphone 5
is not being sensed, which means that the sensitivity is poor or the lead wire 11 is broken, etc., and the determination of Sr1 becomes No, and the process moves to Sr1 to display an abnormality.

On the other hand, when the comparator 24 is outputting, Sr1
The determination becomes YES, 5TIO moves, and it is determined whether or not the predetermined high frequency fN has been determined. If not, the determination becomes NO and the process moves to 5T11. Then, the oscillator 26 is set to the next slightly higher frequency f2, and Sr6
Returning to that frequency f2, the lowest sound pressure Pm1n (
fz) and the above operation is repeated. In other words, the above operations are repeated in sequence until the high frequency fN is reached, at which point the 5TIO judgment is YES.
Then, moving to 5T12, the amplifier 16 is set to the lowest sound pressure Pm1n (fH-z) of the highest frequency fN41, and a check sound is emitted.

Then, the process moves to 5T14, and it is determined whether or not the comparator 24 is outputting (first determining means). If it is outputting, the process moves to Sr1 and an abnormality is displayed; if it is not outputting, the process moves to 5T15. , the normality indicator lamp 9a lights up and the check operation ends.

<Embodiment 2> This embodiment is shown in FIG. 6, and is a microphoneless cuff type blood pressure monitor 1 in which a microphone 5 and a sound generator 13 are both provided within the main body 2.

In other words, there are two air pipes 27 in the middle of the air pipe 27 provided in the main body 2.
The auxiliary air pipe 27a is branched into a cross shape, and a microphone 5 and a sound generator 13 are attached to the ends of the auxiliary air pipe 27a.

Therefore, the check sound from the sound generator 13 is transmitted to the auxiliary air pipe 27.
a and is transmitted to the microphone 5.

The rest is the same as in Example 1.

<Embodiment 3> This embodiment is shown in FIG. 7, and is a microphoneless cuff type blood pressure monitor 1 similar to Embodiment 2, with a microphone 5 and a sound generator 13.
are both provided in the main body 2.

An air tube 4 connected to the cuff 3 is configured to be detachable from the main body 2, and a microphone 5 is connected to an air tube 28 provided inside the main body 2.

On the other hand, an air pipe 29 connected to the sound generator 13 opens on the side surface of the main body 2. Furthermore, this air pipe 29 and the air pipe 2
8 are detachably connected to each other by a U-shaped connecting tube 30.

Therefore, when checking the microphone 5, the cuff 3 is removed and the connecting tube 30 is connected to emit a check sound.

The rest is the same as in Example 1.

In each embodiment, the signal from the microphone 5 is output to the control circuit 25 etc. via the comparator 24, but other discriminators etc. may be used.

[Brief explanation of drawings]

The drawings show embodiments of the present invention, and FIG. 1 is a front view of the blood pressure needle of embodiment 1, FIG. 2 is a partially omitted sectional view of the same when checking the microphone, FIG. 3 is a block diagram of the same, and FIG. The figure is a diagram showing the relationship between the frequency of the check sound and the sound pressure, Figure 5 is a control flow diagram showing the checking operation of the microphone of the blood pressure needle, and Figure 6 is a partially sectional plan view showing the blood pressure needle of Example 2. ,
FIG. 7 is a partially sectional plan view showing the blood pressure needle of Example 3. 1: Blood pressure needle, 2: Main body, 3: Cuff, 5: Microphone, 8: Check switch, 9: Check display section, 13: Sound generator, 16: Amplifier, 18: Cuff pressure detector, 22: Blood pressure determination circuit, 25: Control circuit, 26: Oscillator patent applicant Tateishi Electric Co., Ltd. agent Patent attorney Shigeru Nakamura Figure 4 Procedure amendment (Own ship 1, Indication of incident 1982 Patent side No. 147881 2, Name of invention Sphygmomanometer 3, relationship with the case of the person making the correction Patent applicant address 10 Hanazono Tsuchido-cho, Ukyo-ku, Kyoto City Name (294)
) Tateishi Electric Co., Ltd. Representative: Takao Tateishi 4, Agent address: ◎5 Kakihoncho, Gojo-dori Omiya Higashiiri-ru, Shimogyo-ku, Kyoto-shi 600
41 Yamazen Building 4026 at No. 94, Figure 6 of the drawing subject to correction

Claims (3)

[Claims] (1) A main body, a cuff connected to the main body, a cuff pressure detection means for detecting the pressure inside the cuff, a microphone for sensing Korotkoff sounds, and detecting blood pressure by signals from the cuff pressure detection means and the microphone. blood pressure determination means for determining the blood pressure; a sound generator for emitting a check sound from the microphone;
oscillation means for sequentially oscillating signals of different frequencies and inputting them to the sound generator; sound pressure control means for controlling the check sound to a minimum sound pressure and a maximum sound pressure of a predetermined level for each frequency;
a first determining means that determines whether or not the microphone detects the check sound when the lowest sound pressure check sound is generated, and generates an abnormal signal when detecting the check sound; A second device that determines whether or not a check sound is detected and issues an abnormal signal when no check sound is detected.
A sphygmomanometer characterized by comprising a discrimination means. (2) The blood pressure needle according to claim 1, wherein the microphone is provided in the cuff, the sound generator is provided in the main body, and the microphone is brought close to the sound generator to emit a check sound. . (3) the microphone and sound generator are provided in the main body;
The blood pressure monitor according to claim 1, characterized in that the blood pressure monitor is connected via an air tube.