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DESCRIPTION JP2000189419

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DESCRIPTION JP2000189419
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
ultrasonic probe for blood flow measurement used in connection with, for example, an ultrasonic
blood flow meter for measuring blood flow flowing in a vinyl tube.
[0002]
2. Description of the Related Art Heretofore, as an ultrasonic probe for measuring blood flow in a
vinyl tube by fixing it by sandwiching a vinyl tube through which blood flows, for example, those
shown in FIGS. Are known. The ultrasonic probe 1 has two housings 3 and 4 connected so as to
be able to open and close with a hinge 5 and having a tube accommodating groove 6
corresponding to the outer diameter of the vinyl tube 2. One housing 3 Inside, the transmission
side piezoelectric element 7 and the matching layer 8 made of resin or the like are disposed, and
in the other housing 4, the reception side piezoelectric element 9 and the matching layer 10 are
disposed.
[0003]
Further, the housings 11 and 12 are formed on the outer surfaces of the two housings 3 and 4
respectively, and the printed circuit boards 12 and 13 for relay are disposed in the housings 11.
The pattern of the printed circuit boards 12 and 13 and the two piezoelectric elements 7 and 9
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are connected, and the patterns of both printed circuit boards 12 and 13 are connected via a
connection cable 14 formed of a coaxial line as a connecting wire. . An ultrasonic cable 15
connected to an ultrasonic blood flow meter (not shown) is connected to the pattern of one of the
printed circuit boards 12. Furthermore, the two housings 3 and 4 are clamped by a thin clamp
plate 16 (for example, a stainless steel plate or the like) having a spring property to clamp the
vinyl tube 2 with a predetermined pressure, and the outer periphery of the housings 3 and 4 An
arrow 17 indicating the direction of the ultrasonic probe 1 is displayed on, for example, the
opposite outer surface of the surface.
[0004]
Then, in a state where the tip of the ultrasonic cable 15 is connected to the ultrasonic blood flow
meter, the ultrasonic probe 1 opens the respective housings 3 and 4 and puts the vinyl tube 2 in
the tube housing groove 6 of the other housing 4. Then, the housing 3 is closed and clamped by
the clamp plate 16. As a result, the inner surfaces of the matching layers 8 and 10 of both the
housings 3 and 4 sandwich and deform the opposing outer peripheral surface of the vinyl tube 2
with a predetermined pressure, and the vinyl tube 2 is on the inlet side of both the housings 3
and 4 And the state shown in FIG. 8 positioned in the hole formed by the tube accommodating
groove 6 on the outlet side.
[0005]
In this state, when a high frequency oscillation waveform (for example, an oscillation waveform
of 2.5 MHz) is applied from the ultrasonic cable 15 to the transmission side piezoelectric element
7, the high frequency oscillation waveform is converted into an ultrasonic signal by the
transmission side piezoelectric element 7 A signal is applied to the blood in the vinyl tube 2
through the matching layer 8. The ultrasonic signal applied to the blood is received by the
receiving piezoelectric element 9 through the vinyl tube 2 and the matching layer 10 while being
reflected by the blood cells. Then, the received ultrasonic signal is converted into an electric
signal by the receiving-side piezoelectric element 9, and the electric signal is supplied to the
ultrasonic blood flow meter through the ultrasonic cable 15, and the blood flow meter detects the
vinyl tube. The blood flow in 2 will be measured.
[0006]
By the way, in the ultrasonic probe 1, since the connection cable 14 as the crossover wiring is
arranged in a state of being drawn around the housings 3 and 4, The connection cable 14 located
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outside the housings 3 and 4 is susceptible to the influence of external noise and is inferior in
noise resistance characteristics and, for example, the connection cable 14 itself becomes an
obstacle at the time of setting the ultrasonic probe 1 to the vinyl tube 2 There is a problem that
the handling of the ultrasonic probe 1 is poor.
[0007]
Further, at the time of blood flow measurement, it is necessary to set the direction of the
ultrasonic probe 1 and the direction of the blood flow flowing in the vinyl tube 2 to a
predetermined direction, but in the above ultrasonic probe 1, the housings 3 and 4 are provided.
Since the direction is grasped by the arrow 17 displayed on the outer surface of the display, the
display surface of the arrow 17 can be viewed directly as in the case where the surface for fixing
the clamp plate 16 of the housings 3 and 4 faces upward. It is difficult to accurately and easily
comprehend the direction of the ultrasonic probe 1 when the display 17 becomes unclear or the
display 17 itself disappears due to a predetermined number of uses.
As a result, there is a problem that the attachment workability is poor, for example, the
attachment of the ultrasonic probe 1 to the vinyl tube 2 becomes troublesome.
[0008]
Furthermore, since the pair of housings 3 and 4 are clamped by the clamp plate 16 made of a
thin metal plate having spring property, the spring property of the thin metal plate is easily
deteriorated by repeated use of the ultrasonic probe 1. There has been a problem that the pair of
housings 3 and 4 may not be reliably clamped.
[0009]
The present invention has been made in view of such circumstances, and an object of the
invention according to claim 1 or 2 is to arrange a connecting cable for connecting a relay
substrate connected to a transmitting element and a receiving element in a housing An object of
the present invention is to provide an ultrasonic probe for blood flow measurement, which can
improve noise resistance and handleability of the probe itself.
In addition to the object of the invention according to claim 1 or 2, the object of the invention
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according to claim 3 is to measure the blood flow by which the direction of the ultrasonic probe
can be grasped at a glance, and the attachment workability to a vinyl tube can be improved. The
object of the invention according to claim 4 is, in addition to the object of the invention according
to claims 1 to 3, a blood flow which can securely clamp the housing and can always stabilize the
clamping state. An object of the present invention is to provide an ultrasonic probe for
measurement.
[0010]
SUMMARY OF THE INVENTION In order to achieve the above object, the invention according to
claim 1 of the present invention is characterized in that the transmitting element and the
receiving element are disposed inside and are openably connected by a hinge. The housing has
two housings, and the housing sandwiches a vinyl tube through which blood flows, and
ultrasonic waves are applied from the transmitting element to the blood flow in the vinyl tube,
and blood is received based on the signal received by the receiving element. In the ultrasonic
probe for measuring blood flow, the transmission side element and the reception side element
are connected to the relay substrate in each housing, and the connection cable connecting both
the relay substrates is inside the hinge side of each housing It is characterized in that it is
arranged in
[0011]
The invention according to claim 2 is characterized in that the connecting cable is disposed
inside the hinge while being guided by a cable insertion portion provided on the hinge side of
each housing.
[0012]
With such a configuration, the two housings connected so as to be openable and closable by the
hinge and having the transmitting element and the receiving element disposed therein sandwich
the vinyl tube in which the blood flow flows on the inner surface with a predetermined pressure,
In the state, an ultrasonic signal is applied from the transmitting element to the vinyl tube (blood
flow), and the ultrasonic signal becomes an electric signal received by the receiving element
while being reflected by blood cells.
The blood flow in the vinyl tube is measured by this electrical signal, and at this time, a cable is
inserted through the connection cable connecting the two relay boards connected to the
transmitting element and the receiving element, for example, on the hinge side of the two
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housings. Since the connection cable is disposed while being guided, the connection cable is not
cross wired outside the housing, and the noise resistance characteristics and the handleability are
improved.
[0013]
The invention according to claim 3 is characterized in that the housing is formed so that the
external shapes of the inlet side and the outlet side of the vinyl tube are different.
With such a configuration, the direction of the ultrasonic probe can be grasped at a glance by the
different outer shapes of the inlet and outlet of the housing, and the workability of attaching the
ultrasonic probe to the vinyl tube can be improved.
[0014]
Further, in the invention according to claim 4, both housings are such that the clamp member
made of synthetic resin having the locking portion is fixed to the side face of one housing on the
side opposite to the hinge, and the vinyl tube is held by the clamp member. Are clamped. With
this configuration, the clamp member is formed of slippery synthetic resin such as Teflon, for
example, and both housings are clamped by the locking of the locking portion at the tip of the
clamp member to the outer surface of the housing. The vinyl tube is securely clamped in both
housings, and the durability of the clamp member itself can be improved, so that a stable
clamping state is always obtained.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will
now be described in detail with reference to the drawings. 1 to 7 show an embodiment of an
ultrasonic probe for blood flow measurement according to the present invention, and FIG. 1 is a
perspective view thereof, FIG. 2 is a plan view, FIG. 3 is a developed view of a housing, and FIG.
FIG. 5 is a schematic view of the connection circuit, FIG. 5 is a plan view of the main part of the
housing, FIG. 6 is a cross-sectional view taken along the line AA of FIG. The same reference
numerals as in FIGS. 8 to 11 denote the same parts, and a detailed description thereof will be
omitted.
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[0016]
In FIGS. 1 to 3, the ultrasonic probe 1 has two housings 3 and 4 openably and closably connected
by a hinge 5 and having a tube receiving groove 6 on both sides. The housings 3 and 4 are made
of, for example, aluminum material. The outer shape of the inlet side 3a, 4a and the outer shape
of the outlet side 3b, 4b are formed to be different from each other by the cutting process.
[0017]
That is, on the inlet sides 3a and 4a of the two housings 3 and 4, the notched surface 20 one step
lower than the outer surfaces of the housings 3 and 4 and the inclined surface 21 continuous to
the notched surface 20 are formed. The side with the surface 21 is the inlet side of the ultrasonic
probe 1, and the side without the cutout surface 20 and the inclined surface 21 is the outlet side.
In addition, although the arrow 17 similar to the past is displayed on the outer surface of the
inlet side 3a, 4a of the housings 3 and 4, this arrow 17 is for obtaining compatibility with the
conventional ultrasonic probe 1. Yes, not necessarily.
[0018]
Further, a clamp member 22 is attached to a side surface of the housing 4 on the side opposite to
the hinge 5 by a screw 23. The clamp member 22 is formed of, for example, a slippery synthetic
resin such as delrin or teflon, and a key-like locking portion 22a is integrally formed at the tip
thereof. When the inner surfaces of both the housings 3 and 4 are in contact with each other, the
locking portion 22a of the clamp member 22 is locked to the outer surface of the housing 3 and
the locking portion as shown by the arrow a in FIG. By deforming 22a, the clamping state of both
housings 3 and 4 is released.
[0019]
Furthermore, as shown in FIG. 7, the transmission-side piezoelectric element 7, the matching
layer 8, and the printed board 12 are disposed inside the housing 3, and the receiving-side
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piezoelectric element 9 inside the housing 4, the matching layer 10, the printed circuit board 13
is disposed. Further, as shown in FIG. 3, on the hinge side of the housings 3 and 4, on the inlet
side 3a and 4a, a cable insertion portion 24 in which the connection cable 14 is inserted and
accommodated as described later is formed.
[0020]
The cable insertion portion 24 is, as shown in FIGS. 5 and 6, a long groove-like recess 25
provided at the end of the housings 3 and 4 (only the housing 3 is shown in the drawing) and the
end of the recess 25. A pair of guide pins 27 and 28 for guiding the wiring of the connection
cable 14 are fixed in the recess 25. The holes 26 communicate with the substrate
accommodation portion 11 of the housings 3 and 4, respectively.
[0021]
The connection cable 14 is soldered at one end thereof to a terminal (for example, a pattern) of
the printed circuit board 12 in the housing 3 and accommodated in the hole 26 and the recess
25 of the housing 3. The other end side is connected to a terminal (for example, a pattern) of the
printed circuit board 13 in the housing 4.
As a result, the printed circuit board 12 and the printed circuit board 13 are connected by the
connection cable 14, and at this time, the connection cable 14 is guided while being bent by the
guide pins 27, 28 in the long groove shaped recess 25 of both housings 3, 4. Are drawn around.
[0022]
Next, the operation of the ultrasonic probe 1 will be described. First, with both housings 3 and 4
open, the direction of the ultrasonic probe 1 and the flow direction of the blood flow of the vinyl
tube 2 in which the blood flow is flowing are predetermined directions, that is, the inlet side of
the ultrasonic probe 1 The vinyl tube 2 is accommodated and disposed in the tube
accommodating groove 6 of the housing 4 so that the blood flow flows from the side to the outlet
side, and the housing 3 is closed with the hinge 5 as a fulcrum. The direction of the ultrasonic
probe 1 at the time of setting of the vinyl tube 2 is set such that the side having the cutout
surface 20 and the inclined surface 21 of the housings 3 and 4 is the inlet side.
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[0023]
When the housing 3 is closed and the housing 3 comes into contact with the inner surface of the
housing 4 while receiving pressure from the vinyl tube 2, the clamp member 22 which has been
deformed outward by the pressing operation of the housing 3 is released from deformation by its
elastic force. Thus, the locking portion 22a is automatically locked to the outer surface of the
housing 3. At this time, since the clamp member 22 is formed of a slippery synthetic resin, the
clamp member 22 which is smoothly locked to the outer surface of the housing 3 and
temporarily locked is fixed by the both housings 3, Hold the locked state of 4 securely.
[0024]
When both the housings 3 and 4 are clamped by the clamp member 22 and the vinyl tube 2 is
sandwiched by the housings 3 and 4 as shown in FIG. 7, the blood flow is measured in this state.
In the measurement of the blood flow, as in the prior art, a high frequency oscillation waveform
is applied from the ultrasonic cable 15 to the transmission-side piezoelectric element 7 to
convert it into an ultrasonic signal, and this ultrasonic signal is converted to a vinyl tube through
the matching layer 8 In addition to the blood in 2, the ultrasonic signal reflected by the blood
cells in the blood is received by the receiving-side piezoelectric element 9 through the vinyl tube
2 and the matching layer 10 and converted into an electrical signal, and further, this electrical
signal is It is performed by supplying an ultrasonic blood flow meter via the ultrasonic cable 15.
[0025]
Thus, according to the ultrasonic probe 1 of the above embodiment, the cable insertion portion
24 is provided on the hinge 5 side of the two housings 3 and 4 which can be opened and closed,
and the cable insertion portion 24 guides the connection cable 14 while Since the housings 3 and
4 are housed and arranged inside the hinge 5 side, the connection cable 14 is not drawn around
the housings 3 and 4 and external noise to which the connection cable 14 is subjected is
reduced. Since the noise resistance characteristic of the above can be improved, and the cable
pulled out to the outside is only one ultrasonic cable 15, the handleability of the ultrasonic probe
1 itself can be improved.
[0026]
In particular, if a coaxial cable is used as the connection cable 14 and the materials of the
housings 3 and 4 themselves are set to a material having a shielding function, the housings 3 and
4 themselves enter external noise into the connection cable 14 (impact) Can be almost
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eliminated, so that the ultrasonic probe 1 having excellent noise resistance can be obtained, and
the blood flow can be measured with high accuracy by the ultrasonic blood flow meter.
[0027]
Further, a long groove-like recess 25 and a hole 26 as the cable insertion portion 24 are formed
on the inner surface of the housings 3 and 4 on the hinge 5 side, and a pair of guide pins 27 for
guiding the connection cable 14 into the recess 25. , 28 so that the connecting cable 14 can be
bent and accommodated with a predetermined length while being guided by the guide pins 27,
28, and excessive bending of the connecting cable 14 can be prevented when opening and
closing the housings 3, 4. An adverse effect on the opening and closing operation of the housings
3 and 4 by the connection cable 14 is prevented, and a good opening and closing operation can
be obtained.
In addition, since the connection cable 14 can have a certain degree of slack due to the long
groove-like recess 25, both ends of the connection cable 14 are soldered to the printed circuit
boards 12 and 13 using this slack, the housing 3, Assembling work of No. 4 can be performed,
and the assemblability of the ultrasonic probe 1 can also be improved.
[0028]
Furthermore, since the notch surface 20 and the inclined surface 21 are provided on the inlet
sides 3a and 4a of the two housings 3 and 4, the inlet side and the outlet side of the ultrasonic
probe 1 are determined by the presence or absence of the cutout surface 20 and the inclined
surface 21. The direction of the ultrasonic probe 1 and the vinyl tube 2 can be easily and
accurately set in combination with the display of the arrow 17 provided on the outer surface, for
example, at the time of blood flow measurement. It becomes possible to easily perform the set
operation of 1.
Further, the attachment side of the clamp member 222 can be grasped at a glance by the inclined
surface 21, and the positioning operation at the time of assembling the housings 3 and 4 can be
easily performed.
[0029]
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Furthermore, since the clamp member 22 for clamping the two housings 3 and 4 is made of
slippery synthetic resin, the locking portion 22a can be smoothly formed on the outer surface of
the housing 3 by the slideability of the clamp member 22 at the time of clamping. As well as
being able to be locked, it becomes possible to obtain a secure sense of clamping, and the
durability of the clamp member 22 can be enhanced as compared to the conventional metal
plate, so that a stable clamping state (opening and closing is always achieved State) can be
obtained.
[0030]
In the above embodiment, the ultrasonic probe 1 is provided by providing the cutout surface 20
and the inclined surface 21 on the inlet sides 3a and 4a of the housings 3 and 4, respectively,
and making the outlet sides 3b and 4b different in outer shape. The external shape may be made
different by providing only the notched surface 20 or only the inclined surface 21. Alternatively,
the notched surface 20 may be formed on only one of the housings 3 and 4 or the inclined
surface 21. An appropriate deformed shape can be adopted, such as providing the inclined
surface 21 or forming the inlet side 3a, 4a and the outlet side 3b, 4b in shapes different from the
outer surface of the housings 3, 4 respectively.
[0031]
Further, the shapes and materials of the housings 3 and 4 themselves, the shapes and materials
of the clamp members 22 and the structure of the cable insertion portion 24 in the above
embodiment are also an example, for example, according to the outer diameter of the vinyl tube
2 to be measured. It is needless to say that various changes can be made without departing from
the scope of each invention according to the present invention, such as setting as appropriate.
[0032]
As described above, according to the present invention, the transmitting element and the
receiving element disposed in the two housings which can be opened and closed by the hinges
are respectively connected to the relay board. At the same time, since the connection cable
connecting both the relay boards is arranged while being guided in the housing using the cable
insertion portion provided on the hinge side of the two housings, for example, the connection
cable is cross wired outside the housing Noise resistance and handleability can be improved.
[0033]
According to the invention of claim 3, in addition to the effects of the invention of claim 1 or 2,
the external shape of the inlet / outlet side of the housing is different, so the direction of the
ultrasonic probe can be grasped at a glance by this external shape. It is possible to improve the
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workability of attaching the ultrasonic probe to the vinyl tube.
[0034]
According to the invention of claim 4, in addition to the effects of the invention according to
claims 1 to 3, since the clamp member is made of a slippery synthetic resin such as Teflon, for
example, While both housings are clamped at the stop, the vinyl tube can be reliably clamped by
both housings, the durability of the clamp member itself can be improved, and a stable clamping
state can always be obtained, etc. Play an effect.
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