WO2017195265A1 - Ultrasonic medical device - Google Patents

Abstract

This ultrasonic medical device which has, housed in a casing, an ultrasonic vibrator that has alternately laminated piezoelectric bodies and electrode layers, comprises: a lock portion which is provided in a position corresponding to nodes of ultrasonic waves generated by the ultrasonic vibrator and is connected to the ultrasonic vibrator; a locked portion which is provided on the casing and is configured to be capable of positioning the ultrasonic vibrator by engaging with the lock portion; a housing portion which is provided in the casing and houses the ultrasonic vibrator; a wiring portion which comprises a conductor and is provided inside the housing portion; and a power supply portion which is electrically connected to the wiring portion. When the lock portion is engaged with the locked portion and the ultrasonic vibrator is disposed inside the housing portion, the electrode layers are electrically connected to the wiring portion so that power can be supplied from the power supply portion to the ultrasonic vibrator.

Description

Ultrasound medical equipment

The present invention relates to an ultrasonic medical device.

2. Description of the Related Art Conventionally, an ultrasonic medical apparatus that performs various treatments on a tissue by using friction and heat generated by ultrasonic vibration is known.
Such an ultrasonic medical device includes an ultrasonic transducer that generates ultrasonic vibrations. The ultrasonic transducer is disposed, for example, in an operation unit on the hand side of the ultrasonic medical apparatus. The ultrasonic vibration generated in the operation unit is transmitted to the treatment unit on the distal end side through a rod-like probe or the like.

As one of the ultrasonic vibrators, a bolted Langevin vibrator (BLT) in which piezoelectric bodies and layered electrodes are alternately stacked is known. The BLT normally vibrates by supplying power, but the polarity of electrodes adjacent in the stacking direction is reversed. Therefore, the wiring provided in the BLT needs to be formed so that only electrodes having the same polarity arranged in every other direction in the stacking direction are connected.
As such a wiring structure, for example, a structure described in Patent Document 1 is known.

Japanese Unexamined Patent Publication No. 2010-34817

The wiring described in Patent Document 1 includes a conductive layer that connects electrodes of the same polarity arranged every other line, and an insulating layer formed on electrodes of different polarities that are located between the electrodes of the same polarity. The conductive layer extends on the insulating layer, thereby connecting the electrodes having the same polarity to each other while maintaining an insulating state with the electrodes having different polarities.
However, since the wiring structure described above is complicated, the manufacturing process of the ultrasonic medical device becomes complicated. If the size of the ultrasonic transducer is further reduced, it may become more difficult to form the wiring having the above structure.

In view of the above circumstances, an object of the present invention is to provide an ultrasonic medical device that can be easily manufactured and can easily and reliably supply power to an ultrasonic transducer.

A first aspect of the present invention is an ultrasonic medical apparatus in which an ultrasonic transducer in which piezoelectric bodies and electrode layers are alternately stacked is stored in a casing, and the ultrasonic wave generated by the ultrasonic transducer A locking portion provided at a position corresponding to the node of the head and connected to the ultrasonic transducer, and provided in the housing, and the ultrasonic transducer can be positioned by engaging with the locking portion. A configured latched portion; a housing portion provided in the housing for storing the ultrasonic transducer; a wiring portion formed of a conductor and provided in the housing portion; An electric power supply unit connected to each other, and when the ultrasonic transducer is disposed in the storage unit by engaging the locking unit and the locked unit, the electrode layer and the wiring unit are An ultrasonic wave that is electrically connected and can supply power from the power supply unit to the ultrasonic transducer. It is a care unit.

According to the ultrasonic medical device of the present invention, it can be easily manufactured and power can be supplied to the ultrasonic transducer easily and reliably.

It is a figure which shows the ultrasonic medical device which concerns on 1st embodiment of this invention in a partial cross section. It is an enlarged view which shows the storage part periphery of the ultrasonic medical device. FIG. 3 is a cross-sectional view taken along line II in FIG. 2. FIG. 3 is a sectional view taken along line II-II in FIG. 2. It is sectional drawing of the storage part in the modification of the ultrasonic medical device. It is sectional drawing of the storage part in the modification of the ultrasonic medical device. It is an enlarged view which shows the storage part periphery of the ultrasonic medical device which concerns on 2nd embodiment of this invention. It is an expanded sectional view showing the tip part of the ultrasonic medical device concerning a third embodiment of the present invention. It is a front view of the vibrator unit in the ultrasonic medical device. It is sectional drawing which shows the front-end | tip part of the insertion part in the modification of the ultrasonic medical device.

A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a schematic diagram showing a partial cross section of the entire configuration of the ultrasonic medical device 1 of the present embodiment.

The ultrasonic medical device 1 includes a tubular insertion portion 11 to be inserted into a living body, a treatment portion 20 provided at a distal end portion of the insertion portion 11, an operation portion 12 connected to the insertion portion 11, and an operation portion 12. And a vibrator unit 40 disposed therein. The insertion unit 11 and the operation unit 12 constitute a housing 10 that defines the basic outer shape of the ultrasonic medical device 1.

Inside the housing 10, a storage unit 30 in which a part of the vibrator unit 40 is stored is provided. A locked portion 15 for positioning the vibrator unit 40 with respect to the storage portion 30 is provided near the storage portion 30.

The treatment section 20 includes a probe 21 inserted through the insertion section 11 and a gripping member 22 attached to the distal end of the insertion section 11. The proximal end of the probe 21 is connected to the transducer unit 40. The grip member 22 is connected to the handle 13 attached to the operation unit 12 by a wire or the like. When the handle 13 is operated, the gripping member 22 is driven to open and close, and the tissue can be gripped between the probe 21 and the gripping member 22.

The transducer unit 40 includes an ultrasonic transducer 41, a horn (vibration amplification unit) 42 connected to the ultrasonic transducer 41, and a flange (engagement unit) provided at the boundary between the ultrasonic transducer 41 and the horn 42. Stop portion) 43.

FIG. 2 is an enlarged view around the storage unit 30. 3 is a cross-sectional view taken along the line II of FIG. 4 is a cross-sectional view taken along line II-II in FIG.
As shown in FIG. 2, the ultrasonic transducer 41 has a known configuration in which a plurality of piezoelectric bodies 51 and electrode layers 52 formed of conductors are alternately stacked. Examples of the material of the piezoelectric body 51 include a single crystal of lithium niobate (LiNbO ₃ ). Examples of the material of the electrode layer 52 include a brazing material such as solder.

The horn 42 has a known configuration and functions as a vibration amplification unit by amplifying the ultrasonic vibration generated by the ultrasonic transducer 41 and transmitting the amplified vibration to the probe 21. The flange 43 is provided at a position corresponding to a node of the ultrasonic wave generated by the ultrasonic transducer 41, that is, a position where there is no influence (less) on the generated vibration.

The vibrator unit 40 is mounted in the housing 10 so that the ultrasonic vibrator 41 is stored in the storage unit 30 in a state where the flange 43 is locked to the locked part 15.

As shown in FIG. 2, two wiring parts, a first wiring part 31 and a second wiring part 32, for supplying power to the ultrasonic transducer 41 are arranged in the storage part 30. The first wiring part 31 and the second wiring part 32 are both formed of a conductor.

The first wiring part 31 has a lead part 31a extending along the inner surface of the storage part 30, and a plurality of contact parts 31b connected to the lead part 31a. Each contact portion 31b is formed in a substantially annular shape by a leaf spring that is a conductor of an elastic body, and has an arch-shaped portion that protrudes toward the internal space of the storage portion 30 as shown in FIG. Each contact portion 31b has a predetermined interval in the width direction so that the width direction of the leaf spring is substantially parallel (including parallel; the same applies hereinafter) to the stacking direction of the ultrasonic transducer 41 stored in the storage portion 30. They are lined up.

The second wiring part 32 has a lead part 32 a and a plurality of contact parts 32 b, and has the same configuration as the first wiring part 31. As shown in FIG. 4, the lead portion 32 a is disposed on the inner surface of the storage portion 30 at a position facing the position where the lead portion 31 a is disposed. The arcuate portion of each contact portion 32b protrudes toward the first wiring portion 31, but the contact portions 32b are arranged at a predetermined interval so as to face the lead portions 31a located between the contact portions 31b. It is out. Therefore, the contact portion 31b and the contact portion 32b do not face each other, and the first contact portion 31b and the contact portion 32b are alternately positioned in the stacking direction of the ultrasonic transducers 41 stored in the storage portion 30. The wiring part 31 and the second wiring part 32 are attached.

As shown in FIGS. 2 and 3, each contact portion 31 b of the first wiring portion 31 is an odd-numbered first electrode layer counted from the flange 43 side among the plurality of electrode layers 52 provided in the ultrasonic transducer 41. 52a is in contact with and electrically connected to the first electrode layer 52a. On the other hand, each contact portion 32b of the second wiring portion 32 is in contact with the even-numbered second electrode layer 52b counted from the flange 43 side among the plurality of electrode layers 52, as shown in FIGS. The second electrode layer 52b is electrically connected.

In the ultrasonic medical device 1, the width L1 of each contact portion 31b, 32b shown in FIG. 2 is set to be smaller than the dimension (thickness) L2 in the stacking direction of the piezoelectric bodies 51. The distance L3 in the stacking direction between the contact portions 31b and 32b adjacent in the stacking direction is set to be larger than the thickness L4 of the electrode layer 52.

A cable (power supply unit) 33 connected to an external ultrasonic power source is attached to the proximal end side of the storage unit 30. The lead portions 31 a and 32 a are electrically connected to the cable 33.

When assembling the ultrasonic medical device 1 configured as described above, the first wiring unit 31 and the second wiring unit 32 are arranged in the storage unit 30, and then the transducer unit 40 is attached in the housing 10. . The distance between the contact portion 31b and the contact portion 32b in the direction orthogonal to the stacking direction is set slightly smaller than the minimum dimension in the direction orthogonal to the stacking direction of the ultrasonic transducer 41.

When the ultrasonic transducer 41 is disposed in the storage portion 30 while the flange 43 is locked to the locked portion 15, the ultrasonic transducer 41 moves into the storage portion 30 while pushing the contact portions 31b and 32b. Are disposed in the storage unit 30. The pushed contact portions 31b and 32b are urged toward the ultrasonic transducer 41 by the elastic force to return to the original shape. As a result, the arched portion of each contact portion 31b is pressed against and electrically connected to the first electrode layer 52a, and the arched portion of each contact portion 32b is pressed against the second electrode layer 52b. Are electrically connected.

As described above, the ultrasonic transducer 41 is stored in the storage unit 30 so that power can be supplied from the cable 33. When the horn 42 and the probe 21 are connected in this state, the connection of the main mechanisms of the ultrasonic medical device 1 is completed.

In the completed ultrasonic medical device 1, when electric power is supplied from an ultrasonic power source (not shown) to the transducer unit 40, for example, the first electrode layer 52 a connected to the first wiring portion 31 becomes a positive electrode, and the second wiring portion 32. The ultrasonic transducer 41 vibrates with the second electrode layer 52b connected to the negative electrode serving as a negative electrode. The ultrasonic vibration generated by the ultrasonic transducer 41 is amplified by the horn 42 and then transmitted to the distal end portion of the probe 21 so that the treatment section 20 vibrates. Thereby, desired treatments such as coagulation and incision can be performed on the biological tissue grasped by the treatment unit 20.

As described above, according to the ultrasonic medical device 1 of the present embodiment, the storage unit 30 provided with the first wiring unit 31 and the second wiring unit 32 is provided, and the ultrasonic transducer 41 is connected to the storage unit 30. When arranged inside, the electrode layer 52 is electrically connected to the first wiring part 31 and the second wiring part 32. As a result, a state in which power can be supplied from the cable 33 to the ultrasonic transducer 41 is established.
Therefore, it is not necessary to connect wiring to the ultrasonic transducer 41 in advance, and the manufacturing process of the ultrasonic medical device 1 can be remarkably simplified.

Further, since the first wiring portion 31 and the second wiring portion 32 have contact portions 31b and 32b that protrude into the storage body 30, respectively, the electrode layer 52 of the ultrasonic transducer 41 disposed in the storage portion 30 and The 1st wiring part 31 and the 2nd wiring part 32 can be made to contact reliably, and can be electrically connected.

Furthermore, since the contact portions 31b and 32b are formed of an elastic body, the contact portions 31b and 32b can be urged against the electrode layer 52. As a result, the connection state between the wiring portion and the electrode layer can be suitably maintained even during vibration of the ultrasonic transducer.

In addition, the width L1 of the contact portions 31b and 32b is set smaller than the thickness L2 of the piezoelectric body 51, and the distance L3 between the contact portions adjacent in the stacking direction is set larger than the thickness L4 of the electrode layer 52. For this reason, even if the relative displacement between the locked portion 15 and the contact portions 31b and 32b occurs during manufacturing, as long as the displacement amount is suppressed to L1 or less, the associated contact portion 31b and the electrode layer 52a, And the contact part 32b and the electrode layer 52b can be connected reliably. Further, the contact part 31b and the electrode layer 52b are not connected, and the contact part 32b and the electrode layer 52a are not connected.

Furthermore, the flange 43 for positioning the ultrasonic transducer 41 is provided at a position corresponding to the node of the ultrasonic wave generated by the ultrasonic transducer 41. Therefore, the flange 43 and the locked portion 15 hardly vibrate during the vibration of the ultrasonic transducer 41, and the physical load acting on the flange 43 and the locked portion 15 can be reduced.

In the present embodiment, the example in which the first wiring portion 31 and the second wiring portion 32 are disposed so as to face each other with the ultrasonic transducer 41 interposed therebetween has been described. The arrangement mode is not limited to this.

For example, even if the first wiring part 31 and the second wiring part 32 are arranged so as to contact the electrode layer 52 on the same outer surface of the ultrasonic transducer 41 as in the modification shown in FIG. Good. In this case, since the first wiring portion and the second wiring portion exist on only one of the outer surfaces of the ultrasonic transducer, the occupied positions of the first wiring portion and the second wiring portion in the cross section of the storage portion are summarized. The storage portion can be made smaller.

Further, as in the modification shown in FIG. 6, the first wiring portion 31 and the second wiring portion 32 may be arranged so as to contact the adjacent outer surfaces of the ultrasonic transducer 41.
5 and 6, the contact portion 31b located on the same plane as the first electrode layer 52a is hatched, and the contact portion 32b not present on the same plane is not hatched.

Moreover, the storage unit may be configured by a first member and a second member divided into two. In this way, by connecting the two members to form the storage portion, the contact portion can be pressed toward the ultrasonic vibrator to ensure electrical connection between the wiring portion and the electrode layer. it can.
The storage unit may be formed by using a part of the casing as in the above-described example, or may be formed by a member different from the casing and disposed in the casing.

A second embodiment of the present invention will be described with reference to FIG. The ultrasonic medical device of this embodiment is different from the first embodiment in the shape of the ultrasonic transducer.
In the following description, components that are the same as those already described are assigned the same reference numerals and redundant description is omitted.

FIG. 7 is an enlarged view showing the vicinity of the storage unit in the ultrasonic medical apparatus 101 of the present embodiment. A plurality of hemispherical connection members 142 are provided on the outer surface of the ultrasonic transducer 141.

Each connection member 142 is formed of a conductive material, and is provided so that one connection member 142 is electrically connected to each electrode layer 52. The plurality of connection members 142a connected to the first electrode layer 52a protrude on the same outer surface. The plurality of connection members 142b connected to the second electrode layer 52b protrude on the same outer surface different from the outer surface from which the connection member 142a protrudes. Examples of the material of the connection member 142 include metals and conductive resins.

The first wiring part 31 and the second wiring part 32 of the present embodiment are formed by only the lead parts 31a and 32a, respectively, and do not have a contact part. In the present embodiment, the wiring portion and the electrode layer are electrically connected by the connection member 142 and the lead portions 31a and 32a being in contact with each other.

Also in the ultrasonic medical device 101 of the present embodiment, as in the ultrasonic medical device 1 of the first embodiment, the electrode layer 52 is formed in the first wiring portion only by arranging the ultrasonic transducer 141 in the storage unit 30. 31 and the second wiring part 32 are electrically connected. As a result, the manufacturing process of the ultrasonic medical device can be remarkably simplified.

In addition, although the electrode layer 52 is generally formed to be thin, in this embodiment, since the connection member 142 is provided in the electrode layer 52, the stacking direction of the portion electrically connected to the wiring portion on the electrode layer side The dimension in can be increased. As a result, the wiring layer and the electrode layer can be contacted and connected more reliably.

In the present embodiment, a contact portion may be provided in the wiring portion as in the first embodiment. In this case, when appropriately setting the above-described dimensions L1 to L4, the dimension L5 in the stacking direction of the connecting member 142 shown in FIG. 7 is set to the thickness L2 of the piezoelectric body 51 instead of the thickness L4 of the electrode layer 52. Instead, substantially the same setting can be performed by using the distance L6 in the stacking direction between the adjacent connecting members 142.

A third embodiment of the present invention will be described with reference to FIGS. The ultrasonic medical apparatus of this embodiment differs from the ultrasonic transducers of the above embodiments in the position of the storage unit and the like.

FIG. 8 is a partially enlarged view showing the tip side of the ultrasonic medical apparatus 201 of the present embodiment in a partial cross section. In the ultrasonic medical apparatus 201, the storage unit 202 is provided at the distal end of the insertion unit 11A. The 1st wiring part 203 and the 2nd wiring part 204 have the structure similar to 1st embodiment except the dimension which can be arrange | positioned in 11 A of insertion parts. A locked portion 205 is provided on the distal end side of the storage portion 202. The distal end side wall surface 205a of the locked portion 205 is configured to be elastically deformable by using an elastic material.

FIG. 9 shows a front view of the vibrator unit 210 in the present embodiment. As shown in FIGS. 8 and 9, the transducer unit 210 includes an ultrasonic transducer 41, a horn 42, and a locking portion 211. The probe 21 is connected to the distal end side of the locking portion 211.

The ultrasonic transducer 41 and the horn 42 have substantially the same configuration as that of the first embodiment except that the ultrasonic transducer 41 and the horn 42 have dimensions that can be arranged in the insertion portion 11A. The locking portion 211 is attached to the tip end side of the horn 42 so as to protrude at two locations around the ultrasonic transducer 41 in the stacking direction.

The insertion portion 11A is made of a metal material. An insulating layer 61 is formed between the insertion portion 11A and the first wiring portion 203 and the second wiring portion 204, and the current supplied to the first wiring portion 203 and the second wiring portion 204 is subjected to ultrasonic vibration. Leaking to parts other than the child 41 is prevented. If the insertion portion 11A is formed of an insulating material, the insulating layer 61 may not be provided.

When attaching the vibrator unit 210 to the ultrasonic medical device 201, the vibrator unit 210 is inserted into the opening of the insertion portion 11A from the ultrasonic vibrator 41 side. Then, the front end side wall surface 205a of the locked portion 205 is elastically deformed, so that the locking portion 211 gets over the front end side wall surface 205a.

When the distal end side wall surface 205a returns to the original shape, as shown in FIG. 8, the ultrasonic transducer 41 is positioned in the storage portion 202, and the first wiring portion 203 and the second wiring portion 204 are connected to the contact portion 31b, They are electrically connected to the corresponding electrode layers 52 through 32b. As a result, power can be supplied from the cable 33 (not shown) to the ultrasonic transducer 41.

Also in the ultrasonic medical device 201 of the present embodiment, as in the ultrasonic medical device of each of the embodiments described above, the electrode layer 52 can be formed in the first wiring unit simply by arranging the ultrasonic transducer 41 in the storage unit 202. 203 and the second wiring part 204 are electrically connected. As a result, the manufacturing process of the ultrasonic medical device can be remarkably simplified.

Further, since the storage portion 202 is provided at the distal end portion of the insertion portion 11A, the probe 21 can be directly connected to the transducer unit 210, and the transducer unit 210 can be configured as a replaceable treatment unit.
Therefore, by preparing a plurality of transducer units each having a probe having a different shape such as a round bar shape or a knife shape, the plurality of transducer units can be easily replaced, and a procedure using a probe suitable for the treatment content is performed. It can be performed.

Furthermore, since the distal end side wall surface 205a of the locked portion 205 is configured to be elastically deformable, simply inserting the vibrator unit 210 from the distal end opening of the insertion portion 11A and applying a force makes it possible to easily engage the locking portion 211. And the locked portion 205 can be engaged with each other.

In the present embodiment, the locked portion may be configured to be hard enough to hardly deform elastically. In this case, for example, as shown in a modified example shown in FIG. 10, the hard distal end side wall surface 205 b may be provided on the distal end member 206 that can be screwed to the distal end portion of the insertion portion 10. That is, when attaching the vibrator unit 210, the distal end member 206 is removed from the insertion portion 11. After the vibrator unit 210 is loaded in the storage portion 202, the distal end member 206 is screwed again into the insertion portion 11, whereby the locking portion 211 and the locked portion 205 can be engaged.

The embodiments of the present invention have been described above. However, the technical scope of the present invention is not limited to the above-described embodiments, and combinations of components or components may be changed without departing from the spirit of the present invention. It is possible to make various changes to or delete them.

The present invention can be applied to an ultrasonic medical device.

DESCRIPTION OF SYMBOLS 1, 101, 201 Ultrasonic medical device 10 Case 11A Insertion part 15, 205 Locked part 20 Treatment part 30, 202 Storage part 31 First wiring part 31b, 32b Contact part 32 Second wiring part 33 Cable (power supply) Part)
41 Ultrasonic vibrator 43 Flange (locking part)
51 Piezoelectric body 52 Electrode layer 52a First electrode layer 52b Second electrode layer 142 Connection member 211 Locking portion

Claims (8)

An ultrasonic medical device in which an ultrasonic transducer in which piezoelectric bodies and electrode layers are alternately stacked is stored in a housing,
A locking portion provided at a position corresponding to a node of the ultrasonic wave generated by the ultrasonic vibrator, and connected to the ultrasonic vibrator;
A locked portion provided in the housing and configured to be able to position the ultrasonic transducer by engaging with the locking portion;
A storage unit provided in the housing and storing the ultrasonic transducer;
A wiring portion formed of a conductor and provided in the storage portion;
A power supply unit electrically connected to the wiring unit;
With
When the ultrasonic vibrator is disposed in the storage portion by engaging the locking portion and the locked portion, the electrode layer and the wiring portion are electrically connected, and the power supply portion It will be in a state where power can be supplied to the ultrasonic transducer,
Ultrasound medical device. The ultrasonic medical apparatus according to claim 1, wherein the wiring part is provided so as to protrude into the storage part. The wiring part has a plurality of contact parts connected to the electrode layer,
In a state where the ultrasonic transducer is disposed in the storage unit,
The size of the contact portion in the stacking direction of the ultrasonic transducer is smaller than the size of the piezoelectric body in the stacking direction,
The distance between the contact portions adjacent in the stacking direction is larger than the dimension of the electrode layer in the stacking direction,
The ultrasonic medical device according to claim 2. The ultrasonic medical device according to claim 1, wherein the wiring part is formed to include an elastic body. The storage unit includes a first member and a second member that can be connected to and detached from each other. When the first member and the second member are connected, the wiring unit is pressed toward the ultrasonic transducer. The ultrasonic medical device according to claim 1. A connection member provided to protrude from the outer surface of the ultrasonic transducer, and electrically connected to the electrode layer;
The connection member and the wiring portion are configured to contact each other when the locking portion and the locked portion are engaged and the ultrasonic transducer is disposed in the storage portion. 2. The ultrasonic medical device according to 2. The wiring part has a plurality of contact parts connected to the electrode layer,
In a state where the ultrasonic transducer is disposed in the storage unit,
The size of the contact portion in the stacking direction of the ultrasonic transducer is smaller than the size of the piezoelectric body in the stacking direction,
The distance between the adjacent contact portions is larger than the dimension of the connection member in the stacking direction,
The ultrasonic medical device according to claim 6. An ultrasonic medical device including an ultrasonic transducer in which piezoelectric bodies and electrode layers are alternately stacked,
A tubular insert having an opening at the tip;
In the ultrasonic transducer, a locking portion provided at a position corresponding to an ultrasonic node generated by the ultrasonic transducer;
A treatment section provided on the distal end side of the ultrasonic transducer;
A locked portion provided in the insertion portion and configured to be able to position the ultrasonic transducer by engaging with the locking portion;
A storage portion provided at a distal end portion of the insertion portion and storing the ultrasonic transducer;
A wiring portion formed of a conductor and provided in the storage portion;
A power supply unit electrically connected to the wiring unit;
With
When the ultrasonic transducer is inserted into the distal end opening of the insertion portion from the proximal end side and the locking portion and the locked portion are engaged, the ultrasonic transducer is disposed in the storage portion. And the electrode layer and the wiring part are electrically connected, and the power supply unit is in a state in which power can be supplied to the ultrasonic transducer.
Ultrasound medical device.

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