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The present invention relates to an acoustic filter for a sphygmomanometer used to detect
Korotkoff sound from a sound collection cuff with a microphone o 11%. In general, the standard
clinical method of indirect blood pressure measurement is based on Korotkoff auscultation. In
this case, a cuff band is wound around a human upper arm, and pressurized air is introduced into
the cuff band at a speed of 20 to 30 feet Hp / Inc from a pressure operation opening. If this
pressure value is set to be 10 to 20 beats higher than the predicted blood pressure value, the
artery is compressed and the blood flow is stopped. Then, gradually exhausting the cuff at a
velocity of 2-3 mw / m from the pressure control opening slightly opens the artery, and when
arterial blood flow begins to pass at high speed in systole, the blood vessel wall In the lateral
direction, Korotkoff sound (hereinafter referred to as sound) appears in synchronization with the
arterial wave as a frequency higher than that of the arterial wave, that is, the main component is
damped vibration of several tens Hz to one hundred and several dozen Hz. When the cuff
pressure at this time is taken as the highest blood pressure value and exhausting is continued
gradually from the pressure control opening, a sound also appears in synchronization with the
arterial wave, but the sound expression position is from systole to diastole Will gradually move
towards the Thus, when the expression position is diastole, the artery is already opened and the
sound disappears because the constriction of the blood flow disappears, and the cuff pressure at
this time is indirectly used as the diastolic pressure value. It is measuring. Therefore, the signal
generated by the pressure operation of the cuff band is introduced to the noise detection
transducer via the conduit (3), and the electret condenser microphone which is the microphone
in the noise detection transducer is electrically It is converted to a signal. This electrical signal is
passed through an out-of-figure filter circuit to determine the highest and lowest blood pressure
values. 0 However, in the conventional Korotkoff sound detection and recognition circuit, the
electric circuit alone discriminates between the sound and other noise components Since the
recognition mechanism is used, the load on the filter circuit is large and the cost is high. The
present invention has been provided in view of the above-mentioned point, and is provided
between the sound collection cuff and the Korotkoff sound detection microphone in blood
pressure measurement to reduce the load on the electric filter circuit to improve Korotkoff with
good S / N. It is an object of the present invention to provide an acoustic filter for a blood
pressure monitor which enables sound detection. An embodiment of the present invention will be
described in detail with reference to the drawings. FIG. 2 shows an embodiment of the present
invention, wherein an arterial wave containing sound detected by a sound collecting cuff (1)
passes through a conduit (3). Leading to the f-filter F. In the acoustic filter F, the arterial wave is
connected to the first acoustic body A including the diaphragm (4), the acoustic capacity (6), and
the connecting pipe (6), the diaphragm (7), the acoustic capacity (8), and The frequency
characteristic of the acoustic filter F constituted by the first and second acoustic bodies A, B 0
where it enters the microphone (2) consisting of the electret condenser microphone through the
second acoustic body B constituted by the tube (9) Is shown in FIG.
That is, the first acoustic body A is configured to transmit sound well at the systolic blood
pressure value and to transmit sound efficiently at the second acoustic body B and the diastolic
blood pressure value. The load on the filter circuit can be reduced and sound can be detected
with good S / N. When the resonance frequency of the first acoustic body A is f n and the
resonance frequency of the second acoustic body B is f n, the signal entering the microphone 2 is
fi + f n when schematically shown. FIG. 4 is a book showing another embodiment of the present
invention, in which in the embodiment shown in FIG. is there. That is, in this FIG. 4 embodiment,
by providing a leak hole (lO) for taking in the pulse sound, the microphone (2) K collects a signal
for detecting the pulse rate together with the highest and lowest blood pressure values. It will be
possible to Thus, when the frequency of the pulse wave accommodated by the leak hole is
schematically represented by fo, the signal detected by the microphone (2) is (fA + fB) + fo, and
the signal (fA + fB) detected by the microphone (2) ) + Fo, the sound and pulse wave of f'o are
differentially detected to (f * + fn), and the pulse rate is detected together with the detection of
the maximum / minimum blood pressure value. As described above, according to the present
invention, a plurality of acoustic bodies having different acoustic impedances are provided
between the sound collection cuff and the microphone 0, and an acoustic filter is formed by these
acoustic bodies. The load on the typical filter circuit is greatly reduced, and it has the effect of
being able to easily achieve simplification, cost reduction and miniaturization of the circuit
Brief description of the drawings
1 is a schematic view of a conventional sound detection unit, FIG. 1 is a schematic view of a
sound detection unit according to the present invention-embodiment, FIG. 3 is a characteristic
view of the same, and FIG. 4 is another embodiment of the present invention. (1) is a sound
collection cuff, (2) is a 90 snail, (2) is a leak hole, ASB is a first and second acoustic body, and F is
an acoustic filter. 0 Attorney Attorney Attorney Stone 1) Cho 7 Fig. 1 @ 3-Fig. 4
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