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Description 1, title of the invention
Blood pressure gauge sound collector
8. Detailed Description of the Invention The present invention relates to a sound collection device
for detecting blood vessel sound by means of a microphone and measuring blood pressure
automatically. The blood pressure is measured by sending air to a manchette (a band-shaped air
bag wrapped around an arm) wrapped around the upper tie to increase the pressure in the
manchette to a certain value and then gradually reducing the pressure of the artery. There has
been a long way to measure pulse by □ palpation or auscultation by people. Recently, a device
that detects blood vessel sound with a microphone and electrically measures and displays the
highest and lowest blood pressure (referred to as an automatic sphygmomanometer) has been
developed. It came to be put to practical use. According to this, individual differences and
measurement errors caused by the measurer's familiarity, which was conventionally easy to
occur, can be prevented widely because measurement errors can be prevented. Also in this
automatic sphygmomanometer, ceramic microphones and dynamic microphones are The sound
was collected by contacting the part close to the artery (see FIG. 1). . This type of sound collector
has many drawbacks in sound collection. The first is that the microphone must be housed in a
flat metal case (about 20 to 25 ff in diameter) and must be properly placed on the artery,
generally poor adherence to the human body (above II), especially a sick patient (It is remarkable
in children, etc. Eighth, the microphone characteristic is 100. The reason is that the level of i and
the level of EndPage: 1 are not stable at low frequencies below Hz (see FIG. 2). SUMMARY OF
THE INVENTION The present invention solves the drawbacks of the prior art sound collecting
devices, and the gist of the present invention is to provide a flexible sound collecting space which
can be in close contact with the human body, particularly the upper binding portion, In addition
to providing a single space and providing a microphone in which the sound sensing unit is
exposed in the empty space, in particular, a condenser microphone that obtains a stable output
even in a low frequency band is adopted. Hereinafter, some embodiments of the present
invention will be described in detail with reference to the drawings. Although FIGS. 3 and 4 show
cross sections in the longitudinal direction and the lateral direction in the embodiment of the
present invention, the sound collecting unit 10 has, for example, a length of 180 mm and a width
of 080 mm. It has a size of about ds mm in depth and consists of an outer shell 1 and a liner 2
integrally having a rib 1a in the vertical direction inside. The outer shell 1 and the inner liner 2
are both made of neoprene having a hardness of 60 to 80 degrees, but the thickness is different
and the outer shell 1 has 2 to 3 ff and the inner liner 2 has 0.5 to 1.0 M. This is because the shell
1 is thickened to block extraneous noise, and the lining 2 is thin enough to facilitate the capture
of vascular sounds. The microphone is housed in a cylinder having a diameter of, for example, a
diameter of 10 and a length of 1 Qff11, and a single space 4 formed by the outer shell 1 and the
inner liner 2 communicates with the passage 4a.
For example, as shown in FIG. 5, the sound collecting unit 10 is used by inserting it into a part of
the mounting unit 22 in a part of a well-known mantle 20. In other words, the manchette 20 is
wound around the patient's upper tie and tied with a freely engageable fastener (magic fastener),
and pressure air is supplied to the air bag in the manchette from an air supply device
incorporated in the sphygmomanometer body (not shown). After pumping and raising the
pressure to such a height that the artery is compressed and the pulse stops, if the pressure is
gradually dropped while releasing air, vascular noise starts to be generated. The pressure at this
time is the systolic blood pressure, and when the pressure is further lowered, the blood vessel
sound becomes louder, becomes noise, becomes clear sound, and when the pressure becomes
constant, the sound suddenly becomes small and disappears soon. It is well known that the
pressure when this sudden decrease (or when it disappears) is taken as the diastolic blood
pressure value. In an automated blood clotter, these blood vessel sounds are detected by the
microphone 8 and processed electrically in the body of the blood field meter to display the
highest and lowest blood pressure values, for example, digitally. However, in the conventional
sound collector, as described above, the adhesion to the point of use is poor, and in that the
microphone must be accurately placed on the artery, the sound collector itself has appropriate
flexibility in the present invention. In addition to being in intimate contact with the human body
(especially the superior part) properly according to the manssette, there is a wide space 4 so that
even if any part of it crosses the artery, that part captures the blood vessel sound It is an
advantage of the present invention that it is not necessary to consider whether to select a sound
collecting place or not. Furthermore, since the microphone 8 is a condenser microphone whose
output is almost constant even in a low frequency range (blood vessel sound, in particular, socalled Korotkoff sound related to the highest and lowest blood pressure is 4 o to 5 o Hz, normal
pulse sound is 40 Hz or less In consideration of the fact, as is apparent in FIG. 2, there is a
superior one of the condenser microphone (curve A) over the conventional dynamic condenser
(curve 8) and the like. What is shown in FIG. 6 is the second embodiment of the present
invention, and although the outer shell 1 'and the inner lining 2' do not change in material and
thickness, respectively, the arrangement of the ribs l'a changes, I'm getting better with the top tie.
That is, since there is no rib extending longitudinally, it is easy to bend. FIG. 7 shows a third
embodiment. The feature of this embodiment is suitable when the communication hole 4 連通 a
to the microphone 3 needs to be provided at one end of the sound collector.
The effect of the present invention, that is, the effect common to all the above embodiments, is
that the space 4 surrounded by the outer shell 1 and the lining 2 has a substantially uniform
depth due to the box-shaped outer shell shape. Since the space is not divided into a plurality of
parts by the rib 1a integral with the outer shell, it is a single communicated space, and the sound
sensing portion of the condenser microphone EndPage: 2 lofton 8 is exposed in the space, If the
space, ie, the sound collecting device, is placed in a state crossing the artery above the patient's
artery, blood vessel sounds that the space feels as pressure fluctuations are immediately
captured by the condenser microphone 8 through the single space. And its output level should be
stable even in the low frequency range below 100H7. The inner lining is thin and easy to catch
blood vessel sounds, and the outer shell is thick and easy to block external noises, but it is made
of a flexible material, so it is easy for the patient to (1) It is easy to make close contact and so on.
4. Brief Description of the Drawings FIG. 1 is a perspective view showing a microphone of a
conventional device. FIG. 2 is a graph (frequency vs. output) for comparing the characteristics of
the microphone used in the prior art and the present invention. FIG. 8 is a longitudinal sectional
view (cross section -N of FIG. 4) of an embodiment of the sound collecting apparatus of the
present invention, and FIG. 4 is a transverse sectional view of the same embodiment (N- of FIG. N
cross section). FIG. 5 shows a plan view of a manchette equipped with FIG. 6 and 7 show crosssectional views corresponding to FIG. 8 in different embodiments of the present invention. 1:
Outer shell 2: Inner cover 8: Microphone 4: Space 20: Manshett Co., Ltd. Japan Chorin
representative patent attorney Patent attorney Atsushi Yoneda (one other person) EndPage: 3
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