close

Вход

Забыли?

вход по аккаунту

?

DESCRIPTION JP2015204939

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2015204939
The present invention provides an ultrasonic probe capable of storing power in a power supply
unit in the probe at the time of inspection of a subject. An ultrasonic probe 100 according to an
embodiment includes a vibrator 2 and a power generation layer 4. The transducer 2 transmits
and receives an ultrasonic wave. The power generation layer 4 receives an ultrasonic wave
radiated rearward from the transducer 2 to generate power. In particular, the power generation
layer 4 is provided between the transducer 2 and the backing member 7 that absorbs an
ultrasonic wave emitted rearward from the transducer 2. [Selected figure] Figure 1
Ultrasound probe
[0001]
Embodiments of the present invention relate to ultrasound probes.
[0002]
In the medical field, an ultrasonic diagnostic apparatus is used which irradiates ultrasonic waves
to the inside of a subject and visualizes ultrasonic reflection signals from the subject.
[0003]
The ultrasonic diagnostic apparatus has an ultrasonic probe, an apparatus body, and a cable.
14-04-2019
1
The ultrasound probe may be simply referred to as a "probe".
The probe includes an ultrasonic transducer group, a transmission circuit unit, an echo signal
control electronic circuit unit, and a backing member (sound absorption material). The ultrasonic
transducer group may be referred to as a “vibrator group” or a “vibrator”.
[0004]
The transmission circuit unit performs high-voltage pulse driving by giving an appropriate delay
time to each vibrator, and further supplies an appropriate transmission waveform to each
vibrator. The transducer transmits ultrasonic waves to the subject, and converts the ultrasonic
waves reflected and returned from the subject into electrical signals (echo signals). The echo
signal control electronics control the echo signal and extract it efficiently. The echo signal is sent
to the device body via a cable, amplified in the device body, and reconstructed into a
tomographic image or the like.
[0005]
The device body has a power supply unit. The power of the power supply unit is supplied from
the apparatus main body to the transmission circuit unit and the echo signal control electronic
circuit unit in the probe through a cable.
[0006]
Generally, in the examination of the subject, the probe is often moved to obtain an image of the
inside of the subject from various directions. Therefore, the examination can be facilitated by
moving the probe as freely as possible. However, since the probe and the apparatus main body
are connected by a cable, the cable sometimes limits the movement of the probe, which is a
hindrance to facilitating the inspection.
[0007]
14-04-2019
2
In recent years, attempts have been made to wirelessly perform signal transmission between a
probe and an apparatus main body by high-capacity high-speed wireless communication
technology. Furthermore, there is a system that has a power supply unit that supplies power to
the device body by electromagnetic induction, and a power reception unit that receives power by
electromagnetic induction on the probe side, and stores the power in the power supply unit
(secondary battery) built in the probe. Proposed.
[0008]
At the time of examination of the subject, the vibrator emits unnecessary ultrasonic waves in a
direction opposite to the direction of the subject (hereinafter referred to as “backward”). The
unnecessary ultrasonic waves emitted backward are absorbed by the backing member, converted
into heat, transmitted to the main body of the probe, and emitted outside the main body. Since
the probe is held by the operator and is in contact with the patient, there is a need to suppress
the temperature rise of the probe.
[0009]
International Publication No. 2010/122791 Japanese Patent Application Laid-Open No. 201156104 Japanese Patent Application Laid-Open No. 2003-10177
[0010]
However, when the electric energy in the power supply unit built in the probe is exhausted at the
time of the inspection of the subject, it has to be charged from the outside, and there is a problem
that a time when the probe can not be used for the inspection occurs.
[0011]
This embodiment solves the above-mentioned problem, and it aims at providing an ultrasonic
probe which can be stored in a power supply part in a probe at the time of examination of a
subject.
[0012]
In order to solve the above-mentioned subject, an ultrasonic probe of an embodiment has a
vibrator and a power generation layer.
14-04-2019
3
The transducer transmits and receives ultrasound.
The power generation layer receives an ultrasonic wave emitted rearward from the transducer to
generate power.
[0013]
BRIEF DESCRIPTION OF THE DRAWINGS The conceptual diagram which shows the partial
structure of the ultrasound probe which concerns on 1st Embodiment.
The fragmentary perspective view which shows the electric power generation layer arrange |
positioned between a vibrator | oscillator and a support body. The conceptual diagram which
shows a power generation layer. The conceptual diagram which shows the electrode plate which
approached the electret by being displaced back. The block diagram of an ultrasonic probe. The
figure which shows arrangement | positioning of the component incorporated in an ultrasonic
probe. The conceptual diagram which shows the electric power generation layer which concerns
on 2nd Embodiment. The conceptual diagram which shows the electrode plate displaced to the X
direction with respect to the electret. The conceptual diagram which shows the electric power
generation layer which concerns on a modification. The conceptual diagram which shows the
electret displaced in the X direction with respect to the electret.
[0014]
<First Embodiment> The configuration for storing power in the power supply unit in the probe at
the time of examination of the subject includes (1) means for generating electric power in the
probe. (2) A means is provided for replenishing the power supply unit in the probe with the
generated power. (3) Further, the means for generating power is configured to convert the
ultrasonic wave emitted backward from the transducer into power.
[0015]
14-04-2019
4
With this configuration, the ultrasonic wave absorbed by the backing member is reduced
according to the degree of conversion of the ultrasonic wave into electric power, and the heat
released to the outside of the probe is reduced, and the temperature of the probe is increased.
Has the advantage of being reduced. Furthermore, since a high ultrasonic wave absorbing
function is not required for the backing member, for example, it is possible to make the backing
member thin, which brings about an advantage that the probe can be miniaturized.
[0016]
Next, the ultrasonic probe according to the first embodiment will be described with reference to
the drawings. FIG. 1 is a conceptual view showing a partial configuration of an ultrasonic probe,
and FIG. 2 is a partial perspective view showing a power generation layer disposed between a
transducer and a support. In FIG. 1 and FIG. 2, the upward direction of the paper surface
corresponds to the forward direction (Z1 direction) of the probe, and the downward direction to
the backward direction (Z2 direction) of the probe.
[0017]
As shown in FIGS. 1 and 2, the probe 100 has an acoustic matching layer 1, a vibrator 2, a signal
electrode 3, a power generation layer 4, and a support 7. The support 7 has the function of a
backing member (sound absorption material). The support 7 is an example of the “backing
member”. The power generation layer 4, the signal electrode 3, the vibrator 2, and the acoustic
matching layer 1 are stacked on the support 7. 2 shows a part of the support 7 on which three
acoustic matching layers 1, vibrators 2, signal electrodes 3 and power generation layers 4 are
laminated.
[0018]
As shown in FIG. 2, the acoustic matching layer 1, the vibrator 2, and the signal electrodes 3 are
arranged in two dimensions in the X direction and the Y direction. FIG. 2 shows a part of the
transducers 2 and the like arranged in the X direction, and the transducers 2 and the like
arranged in the Y direction are omitted. The signal electrodes 3 are electrically connected to the
transducers 2 arranged in a two-dimensional manner. A lead wire (not shown) is connected from
the signal electrode 3 to the transmission circuit unit 22 and the echo signal control electronic
circuit unit 23 (see FIG. 4).
14-04-2019
5
[0019]
[Power Generation Layer 4] Next, the power generation layer 4 provided corresponding to one of
the vibrators 2 in the vibrator group will be described with reference to FIG. As shown in FIG. 2,
the power generation layer 4 includes a spacer 8, a sound absorption film 11, an electrode plate
12, a columnar portion 13, an electret 14, a lower electrode 15, and a substrate 16.
[0020]
As shown in FIG. 2, the power generation layer 4 is disposed between the vibrator 2 and the
support 7. When the size of the vibrator 2 is about 200 μm square, the power generation layer
4 is configured in an area within about 100 μm square. In order to form the power generation
layer 4 in such a minute region, Micro Electro Mechanical Systems (MEMS) technology is used in
which the mechanical structure and the electronic circuit are integrated on one substrate. In
order to accommodate the power generation layer 4 between the vibrator 2 and the support 7, a
pair of spacers 8 is provided between the vibrator 2 and the support 7. When the length (height)
of the power generation layer 4 in the front-rear direction is about 50 μm, the length (height) in
the front-rear direction of the spacer 8 may be about 100 μm or less. The spacer 8 is formed of,
for example, a resin such as polyimide or epoxy in the MEMS process for forming the power
generation layer 4. In addition, in FIG. 2, in order to show the internal structure of the electric
power generation layer 4, the spacer 8 which made the height low is shown. The spacing of the
pair of spacers 8 in the Y direction corresponds to the width of the vibrator 2 in the Y direction.
[0021]
The substrate 16 is disposed on the support 7 (e.g., the electret 14). A lower electrode 15 made
of, for example, titanium / gold and having a thickness of 1000 Å / 5000 Å is disposed on the
substrate 16. The terminal of the lower electrode 15 is connected to the terminal of the
conductive electrode plate 12 via a resistor R. An electret 14 having a thickness of about 15 μm
is formed on the lower electrode 15. An insulating layer (not shown) is provided between the
lower electrode 15 and the electret 14.
[0022]
14-04-2019
6
The electret 14 has a plane orthogonal to the radiation direction of the ultrasonic wave emitted
in the Z2 direction (rearward). The electret 14 is an insulator with a semipermanent charge. FIG.
3A shows the electret 14 having a negative charge and the lower electrode in a state in which the
opposite charge (induced charge) is generated. At this time, no charge is generated on the
electrode plate 12.
[0023]
(Electrode Plate 12) FIG. 3A is a conceptual view showing the electrode plate 12 when it is
moved away from the electret 14 by being displaced in the Z1 direction (forward). As shown in
FIGS. 2 and 3A, a pair of columnar portions 13 is disposed on the substrate 16 at a
predetermined interval (equal to or less than the width of the vibrator 2 in the X direction) in the
X direction. Both ends of the electrode plate 12 are supported by the pair of columnar portions
13. The columnar portion 13 is an example of the “support portion”.
[0024]
The electrode plate 12 is made of aluminum and has a thickness of 1 μm. The electrode plate 12
is disposed in parallel with the electret 14. An air layer of about 50 μm is provided between the
electrode plate 12 and the lower electrode 15. The electrode plate 12 vibrates relative to the
electret 14 in response to the ultrasonic wave radiated in the Z2 direction (rearward). The sound
absorbing film 11 is disposed on the electrode plate 12. The sound absorption film 11 is
excellent in ultrasonic absorption, and is formed of a polymer material, for example, a urethanebased synthetic rubber. The electrode plate 12 has a restoring force. That is, when receiving a
force in the Z2 direction (rear), the electrode plate 12 displaces in the Z2 direction against the
restoring force, approaches the electret 14, and does not receive a force in the Z2 direction
(rear). Thus, it is displaced in the Z1 direction away from the electret 14. The electret 14 may be
referred to as a "fixed portion". Furthermore, the electrode plate 12 may be referred to as a
"movable portion".
[0025]
FIG. 3B is a conceptual view showing the electrode plate when approaching the electret by being
14-04-2019
7
displaced in the Z2 direction (rearward). As shown in FIG. 3B, when the electrode plate 12
receives an ultrasonic wave emitted from the vibrator 2 in the Z2 direction (rearward), the
electrode plate 12 is displaced in the Z2 direction, causing the electret 14 to have a negative
charge. Approach to each other. At this time, a positive charge, which is the opposite charge
(induced charge), is generated in the electrode plate 12. On the other hand, part of the positive
charge on the lower electrode 15 disappears. As a result, the potential of the terminal of the
electrode plate 12 becomes higher than that of the terminal of the lower electrode 15.
[0026]
As shown in FIG. 3A, when the electrode plate 12 does not receive an ultrasonic wave emitted
from the vibrator 2 in the Z2 direction (rearward), the electrode plate 12 is displaced in the Z1
direction by its restoring force to move away from the electret 14 . At this time, the positive
charge on the electrode plate 12 disappears. On the other hand, the positive charge on the lower
electrode 15 is increased. As a result, the potential of the terminal of the lower electrode 15
becomes higher than that of the terminal of the electrode plate 12.
[0027]
(Refilling means 26, power supply unit 27) Reciprocation occurs in the electrode plate 12 by
repeating the case where the electrode plate 12 receives and does not receive ultrasonic waves in
the power generation layer 4 at the time of the inspection of the subject. Thereby, an alternating
current is generated between the terminals of the lower electrode 15 and the electrode plate 12.
The replenishment means 26 converts the alternating current generated between the terminals
into direct current, and stores the power supply unit (secondary battery) 27.
[0028]
The maximum power generation output P max of the power generation layer 4 when the
electrode plate 12 reciprocates is expressed by the following equation. P max ∝σ <2> * n * A * f
/ g (1) where σ is the surface charge density of electret 14, n is the number of electret 14, A is
the area of lower electrode 15, and f is electrode plate 12 The frequency of reciprocation, g,
indicates the distance between the electret 14 and the lower electrode 15.
14-04-2019
8
[0029]
(Electronic Circuit Unit 21 Etc.) FIG. 4 is a block diagram showing the construction of the
ultrasonic probe, and FIG. 5 is a view showing the arrangement of components incorporated in
the ultrasonic probe. In FIG.4 and FIG.5, the acoustic matching layer 1 (refer FIG. 1) arrange |
positioned ahead of the vibrator | oscillator 2, and the support body 7 (refer FIG. 1) arrange |
positioned behind the vibrator 2 are abbreviate | omitted and shown. As shown in FIG. 5, a
plurality of transducers 2 are arranged at the front in the probe main body 10 (hereinafter
simply referred to as “main body”), an electronic circuit unit 21 is arranged at the central part
in the main body 10, The storage means 25 is disposed at the rear of the inside of the storage
unit 10. Furthermore, in the main body 10, the communication unit 28 is disposed adjacent to
the storage means 25.
[0030]
As shown in FIGS. 4 and 5, the electronic circuit unit 21 includes a transmission circuit unit 22
and an echo signal control electronic circuit unit 23. The transmission circuit unit 22 is an
example of the “circuit unit that drives the vibrator”.
[0031]
The transmission circuit unit 22 gives a suitable delay time to each vibrator 2 to perform high
voltage pulse driving, and further supplies an appropriate transmission waveform to each
vibrator 2. Thereby, the transducer 2 transmits ultrasonic waves to the subject. The transducer 2
converts the ultrasonic wave reflected back from the subject into an echo signal. The echo signal
control electronic circuit unit 23 controls the echo signal and efficiently extracts it. The echo
signal is sent to the communication unit 28. The communication unit 28 wirelessly transmits an
echo signal to the device body. The apparatus main body amplifies the sent echo signal,
reconstructs a tomographic image and the like, and displays it on the display unit. Further, the
communication unit 28 receives a control signal wirelessly transmitted from the apparatus main
body, and sends the control signal to the transmission circuit unit 22 and the echo signal control
electronic circuit unit 23.
[0032]
14-04-2019
9
(Storage Unit 25) The storage unit 25 includes a replenishment unit 26 and a power supply unit
(secondary battery) 27. The power supply unit 27 supplies power to the transmission circuit unit
22, the echo signal control electronic circuit unit 23, and the communication unit 28.
[0033]
Although the electrical energy of the power supply unit 27 is consumed by the transmission
circuit unit 22 and the like at the time of examination of the subject, the power supply unit 27 is
replenished with the power from the power generation layer 4. Thus, power is continuously
supplied from the power supply unit 27 to the transmission circuit unit 22, the echo signal
control electronic circuit unit 23, and the communication unit 28. That is, the charge cycle of the
power supply unit 27 which is a secondary battery becomes long.
[0034]
According to the above-described power generation layer 4, the ultrasonic wave absorption
function required for the support 7 is lowered as the degree of conversion of the ultrasonic wave
radiated backward from the vibrator 2 to electric power becomes higher, It is possible to make
the support 7 thinner. In addition, even when the degree of conversion of ultrasonic waves into
electric power is extremely high and the ultrasonic absorption function is hardly required of the
support 7, the support 7 is an example of the “backing member”.
[0035]
In the embodiment, at least one of the transmission circuit unit 22, the echo signal control
electronic circuit unit 23, and the communication unit 28 may be used as the power supply
destination from the power supply unit 27. Further, the power supply destination may be
changed according to the degree of consumption of the electrical energy.
[0036]
Second Embodiment Next, an ultrasonic probe according to a second embodiment will be
14-04-2019
10
described with reference to FIGS. 6A and 6B. In the second embodiment, the same components as
those of the ultrasonic probe of the first embodiment are designated by the same reference
numerals and their description is omitted, and different components will be mainly described.
[0037]
In the first embodiment, the electrode plate 12 as a movable portion which is displaced in the
front-rear direction with respect to the electret 14 in response to the ultrasonic wave radiated in
the Z2 direction (rearward) is shown. On the other hand, in the second embodiment, the
electrode plate 12 as a movable portion that receives ultrasonic waves radiated in the Z2
direction (rearward) and displaces the electret 14 in a direction (X direction) orthogonal to the
longitudinal direction. Is provided.
[0038]
(Electrode Plate 12) FIG. 6A is a conceptual view showing a power generation layer according to
the second embodiment. As shown to FIG. 6A, the sound wave absorption film 11 is arrange |
positioned on the upper surface (surface facing the back surface of the vibrator | oscillator 2) of
the electrode plate 12. As shown in FIG. Further, on the upper surface of the electrode plate 12,
inclined grooves 18 which are inclined in the X direction with respect to the Z2 direction
(rearward) are continuously provided in the X direction. In order to provide the inclined grooves
18 continuously, the surface of a substance to which a photosensitive substance is applied is
exposed in a pattern, thereby producing a pattern consisting of an exposed part and a nonexposed part. Is used. For example, as a glass mask used at the time of exposure of a resist
(photosensitive substance), using a mask in which the transmittance of a pattern portion to be
inclined gradually changes, the thickness of the resist is gradually reduced in the direction to
form deep grooves. Form the following pattern. Thereafter, the aluminum surface of the
electrode plate 12 to be the movable portion may be patterned using dry etching.
[0039]
Both end portions of the electrode plate 12 are supported by the pair of columnar portions 13
via biasing means 17 having a restoring force.
[0040]
14-04-2019
11
FIG. 6A shows the electrode plate 12 when not receiving the ultrasonic wave emitted from the
transducer 2 in the Z2 direction (rearward).
At this time, the electrode plate 12 is not displaced in the X direction with respect to the electret
14.
[0041]
FIG. 6B is a conceptual view showing the electrode plate 12 displaced in the X direction with
respect to the electret 14. As shown in FIG. 6B, when the electrode plate 12 receives an
ultrasonic wave emitted from the vibrator 2 in the Z2 direction (backward), the electrode plate
12 has a negative charge against the restoring force of the biasing means 17. With respect to the
electret 14 having the At this time, part of the positive charge on the electrode plate 12
disappears. On the other hand, the positive electrode charged in the lower electrode 15 is
increased. As a result, the potential of the terminal of the lower electrode 15 becomes higher
than that of the terminal of the electrode plate 12.
[0042]
As shown in FIG. 6A, when the electrode plate 12 does not receive ultrasonic waves radiated
from the vibrator 2 in the Z2 direction (rearward), the electrode plate 12 is displaced in the X2
direction with respect to the electret 14 by its restoring force. At this time, the positive charge on
the electrode plate 12 is increased. On the other hand, part of the positive electrode charged in
the lower electrode 15 disappears. As a result, the potential of the terminal of the electrode plate
12 becomes higher than that of the terminal of the lower electrode 15.
[0043]
That is, when the electrode plate 12 receives and does not receive ultrasonic waves at the time of
the examination of the subject, the electrode plate 12 reciprocates, thereby causing the lower
electrode 15 and the electrode plate 12 to be reciprocated. An alternating current is generated
between the terminals. The replenishment means 26 converts the alternating current generated
between the terminals into direct current, and stores the power supply unit 27.
14-04-2019
12
[0044]
(Modification) Further, although the electret 14 as the fixed portion and the electrode plate 12 as
the movable portion are shown in the embodiment, the invention is not limited thereto. That is,
when receiving the ultrasonic waves, the electrode plate 12 may be displaced relative to the
electret 14, and the fixed portion may be the electrode plate 12 and the movable portion may be
the electret 14.
[0045]
Next, a modification of the power generation layer 4 in which the fixed portion is the electrode
plate 12 and the movable portion is the electret 14 will be described with reference to FIGS. 7A
and 7B. FIG. 7A is a conceptual diagram showing a power generation layer according to a
modification, and FIG. 7B is a conceptual diagram showing an electret displaced in the X
direction with respect to the electret.
[0046]
As shown in FIGS. 7A and 7B, the electrode plate 12 and the lower electrode 15 are arranged on
the substrate 16 so as to be aligned. Both end portions of the electret 14 are supported by the
pair of columnar portions 13 via the biasing means 17. On the upper surface of the electret 14,
inclined grooves 18 which are inclined in the X direction with respect to the Z2 direction are
continuously provided in the X direction. A sound absorbing film 11 is provided on the upper
surface of the electret 14.
[0047]
FIG. 7A shows the electret 14 when it receives no ultrasonic wave emitted from the transducer 2
in the Z2 direction. At this time, the electret 14 is not displaced in the X direction with respect to
the electrode plate 12.
14-04-2019
13
[0048]
As shown in FIG. 7B, when the electret 14 receives an ultrasonic wave radiated from the vibrator
2 in the Z2 direction, the electret 14 having a negative charge resists the restoring force of the
biasing means 17 and the electrode plate 12 In the X1 direction. At this time, part of the positive
charge on the electrode plate 12 disappears. On the other hand, the positive charge on the lower
electrode 15 is increased. As a result, the potential of the terminal of the lower electrode 15
becomes higher than that of the terminal of the electrode plate 12.
[0049]
As shown in FIG. 7A, when the electret 14 does not receive an ultrasonic wave radiated from the
vibrator 2 in the Z2 direction (rearward), the electret 14 is displaced in the X2 direction with
respect to the electrode plate 12 by its restoring force. At this time, the positive charge on the
electrode plate 12 is increased. On the other hand, part of the positive electrode charged in the
lower electrode 15 disappears. As a result, the potential of the terminal of the electrode plate 12
becomes higher than that of the terminal of the lower electrode 15.
[0050]
That is, when the electret 14 receives and does not receive ultrasonic waves at the time of
examination of the subject, the electret 14 reciprocates, thereby causing the terminals of the
lower electrode 15 and the electrode plate 12 to be reciprocated. An exchange occurs between
them. The replenishment means 26 converts the alternating current generated between the
terminals into direct current, and stores the power supply unit 27.
[0051]
In the said embodiment, although what generate | occur | produced electric power by the
electrode plate 12, the electret 14, and the lower electrode 15 grade | etc., Was shown as the
electric power generation layer 4, as the electric power generation layer 4, it is not limited to this.
For example, power may be generated by electromagnetic induction or a piezoelectric element.
At this time, the piezoelectric element is vibratably held by receiving the ultrasonic wave emitted
in the X2 direction (rearward).
14-04-2019
14
[0052]
While certain embodiments of the present invention have been described, these embodiments
have been presented by way of example only, and are not intended to limit the scope of the
invention. These embodiments can be implemented in other various forms, and various
omissions, replacements, and modifications can be made without departing from the scope of the
invention. These embodiments and modifications thereof are included in the invention described
in the claims and the equivalents thereof as well as included in the scope and the gist of the
invention.
[0053]
100 ultrasonic probe 1 acoustic matching layer 2 vibrator 3 signal electrode 4 power generation
layer 7 support 8 spacer 10 probe main body 11 sound absorbing film 12 electrode plate 13
columnar part (support part) 14 electret 15 lower electrode 16 substrate 17 biasing means 18
inclined groove 21 electronic circuit unit 22 transmission circuit unit 23 echo signal control
electronic circuit unit 25 storage means 26 replenishment means 27 power supply unit 28
communication unit
14-04-2019
15
Документ
Категория
Без категории
Просмотров
0
Размер файла
26 Кб
Теги
jp2015204939, description
1/--страниц
Пожаловаться на содержимое документа