WO2021187252A1 - Sonde a ultrasons - Google Patents

Sonde a ultrasons Download PDF

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Publication number
WO2021187252A1
WO2021187252A1 PCT/JP2021/009374 JP2021009374W WO2021187252A1 WO 2021187252 A1 WO2021187252 A1 WO 2021187252A1 JP 2021009374 W JP2021009374 W JP 2021009374W WO 2021187252 A1 WO2021187252 A1 WO 2021187252A1
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WO
WIPO (PCT)
Prior art keywords
ultrasonic
ultrasonic vibrator
housing
ultrasonic probe
piezoelectric body
Prior art date
Application number
PCT/JP2021/009374
Other languages
English (en)
Japanese (ja)
Inventor
陽 井口
圭一郎 山本
矢上　弘之
将悟 山屋
Original Assignee
テルモ株式会社
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Application filed by テルモ株式会社 filed Critical テルモ株式会社
Publication of WO2021187252A1 publication Critical patent/WO2021187252A1/fr

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
    • A61B8/12—Diagnosis using ultrasonic, sonic or infrasonic waves in body cavities or body tracts, e.g. by using catheters

Definitions

  • This disclosure relates to an ultrasonic probe.
  • An ultrasonic probe including an ultrasonic transducer is used as an ultrasonic transmitter / receiver for a medical ultrasonic diagnostic device. Recently, a catheter is loaded with a long ultrasonic probe, and ultrasonic diagnosis is performed with the catheter inserted in the body.
  • Patent Document 1 describes an active transducer element having a top main surface and a bottom main surface, a top electrode formed on the top main surface, a bottom electrode formed on the bottom main surface, and conductivity covering the bottom electrode.
  • An ultrasonic probe comprising a backing element, a first lead electrically connected to a top electrode, and a second lead electrically connected to a conductive backing element is disclosed.
  • the active transducer element, top electrode, bottom electrode and conductive backing element of Patent Document 1 are fixed to the terminal housing.
  • Patent Document 1 Attenuates the ultrasonic energy radiated by the back surface of the transducer element forming a part of the ultrasonic vibrator.
  • the terminal housing described in Patent Document 1 still has room for improvement from the viewpoint of suppressing transmission and reception of ultrasonic waves that cause noise.
  • the ultrasonic probe as one aspect of the present disclosure is an ultrasonic probe including an ultrasonic transducer and a housing for supporting the ultrasonic transducer, and the ultrasonic transducer is a device.
  • the housing is provided with a second electrode laminated on the other side, and the housing is provided with a cover portion that covers the ultrasonic transducer on the other side with respect to the piezoelectric body, and the cover portion is the ultrasonic wave.
  • a plurality of protruding or ridge-shaped portions that taper toward the ultrasonic transducer are provided at positions facing the transducer.
  • the cover portion divides a plurality of slots penetrating from the surface facing the ultrasonic vibrator to the back surface located on the opposite side of the front surface, and the cover portion is divided into a plurality of slots.
  • a partition portion located between two adjacent slots among the plurality of slots is provided, and the partition portion includes a ridge-shaped portion that tapers toward the ultrasonic vibrator on the surface side.
  • the partition includes a surface extending along the in-plane direction of the piezoelectric body on the back surface side.
  • a resin member located in the slot is provided.
  • the housing partitions a hollow portion communicating with the slot on the back surface side of the cover portion, and an inner wall for partitioning the hollow portion faces the cover portion.
  • the position is provided with a plurality of protruding or ridge-shaped portions that taper toward the cover portion.
  • a resin member located in the hollow portion is provided.
  • the hollow portion communicates with the outside of the housing at the distal end of the housing, and the slot is located on the proximal end side of the ultrasonic transducer of the housing. It communicates with the outside.
  • the housing includes a support base portion that supports the ultrasonic vibrator in a state where the ultrasonic vibrator and the cover portion are separated from each other.
  • a resin member interposed between the ultrasonic vibrator and the cover portion is provided.
  • the plurality of protruding or ridge-shaped portions of the cover portion are the protruding or ridge-shaped portions that gradually taper from the back surface side to the front surface side of the cover portion. including.
  • the plurality of protruding or ridge-shaped portions on the inner wall that partitions the hollow portion include a protruding or ridge-shaped portion that gradually tapers from the base end to the tip end.
  • an ultrasonic probe having a housing for supporting an ultrasonic vibrator, which has a configuration capable of improving the attenuation performance of ultrasonic energy.
  • FIG. 1 It is a figure which shows the state which the catheter for image diagnosis including the ultrasonic probe as one Embodiment of this disclosure, and the external device are connected. It is a figure which shows the inside of the sheath at the distal end part of the diagnostic imaging catheter shown in FIG. It is sectional drawing in the cross section parallel to the longitudinal direction of the distal end part of the ultrasonic probe shown in FIG. It is sectional drawing of the ultrasonic probe at the position of line I-I in FIG. It is a perspective view which shows the housing in the imaging core of the ultrasonic probe shown in FIG.
  • the longitudinal direction of the diagnostic imaging catheter is described as "longitudinal direction A".
  • the side inserted into the living body in the longitudinal direction A of the diagnostic imaging catheter is described as the "distal end side", and the opposite side is described as the "proximal end side”.
  • the direction from the proximal end side to the distal end side of the diagnostic imaging catheter may be simply described as "insertion direction A1”.
  • the direction from the distal end side to the proximal end side of the diagnostic imaging catheter may be simply described as "removal direction A2".
  • FIG. 1 is a diagram showing an image diagnostic apparatus 100 including an ultrasonic vibrator 11 as an embodiment.
  • the diagnostic imaging device 100 includes a diagnostic imaging catheter 110 and an external device 120.
  • FIG. 1 shows a state in which the diagnostic imaging catheter 110 is connected to the external device 120.
  • FIG. 2 is a diagram showing the inside of the sheath 20 at the distal end of the diagnostic imaging catheter 110 shown in FIG.
  • FIG. 3 is a cross-sectional view of the distal end of the ultrasonic probe 10 in a cross section parallel to the longitudinal direction A.
  • FIG. 4 is a cross-sectional view of the ultrasonic probe 10 at the position of the line I-I in FIG.
  • FIG. 5 is a perspective view showing a housing 12 in the imaging core 60 of the ultrasonic probe 10.
  • the diagnostic imaging catheter 110 is applied to endovascular ultrasound (abbreviated as "IVUS"). As shown in FIG. 1, the diagnostic imaging catheter 110 is driven by being connected to an external device 120. More specifically, the diagnostic imaging catheter 110 of the present embodiment is connected to the drive unit 120a of the external device 120.
  • the diagnostic imaging catheter 110 includes an insertion portion 110a and an operation portion 110b.
  • the insertion portion 110a is a portion of the diagnostic imaging catheter 110 that is inserted into the living body and used.
  • the operation unit 110b is a portion of the diagnostic imaging catheter 110 that is operated in vitro with the insertion unit 110a inserted into the living body.
  • the portion on the distal end side of the distal end side connector 42 (see FIG. 1) described later is the insertion portion 110a, and the distal end side connector 42 to the proximal end side. Is the operation unit 110b.
  • the insertion portion 110a includes an ultrasonic probe 10 and a sheath 20.
  • the operation unit 110b includes an inner pipe member 30 and an outer pipe member 40.
  • the inner tube member 30 holds an end portion of the ultrasonic probe 10 on the proximal end side.
  • the outer tube member 40 holds an end portion on the proximal end side of the sheath 20.
  • the ultrasonic probe 10 can move in the sheath 20 in the longitudinal direction A by moving the inner tube member 30 in the outer tube member 40 in the central axis direction.
  • the drive shaft 13 and the electric signal line 14 which are a part of the ultrasonic probe 10 pass through the inside of the inner tube member 30 and the outer tube member 40, and the insertion portion 110a is inserted in the longitudinal direction A. It extends not only to the region of the above but also to the region of the operation unit 110b. That is, the operation unit 110b of the present embodiment is partially composed of the ultrasonic probe 10 in addition to the inner tube member 30 and the outer tube member 40.
  • the ultrasonic probe 10 includes an imaging core 60, a drive shaft 13, and an electric signal line 14.
  • the imaging core 60 includes an ultrasonic vibrator 11, a housing 12, and first to third resin members 61 to 63.
  • the ultrasonic vibrator 11 includes a piezoelectric element 1 and an acoustic matching member 3.
  • the piezoelectric element 1 includes a flat piezoelectric body 4, a first electrode 5 laminated on at least one side of the piezoelectric body 4 in the thickness direction B of the piezoelectric body 4, and the piezoelectric body 4.
  • the thickness direction B of the above it is composed of a second electrode 6 laminated on at least the other side with respect to the piezoelectric body 4.
  • a surface side one side of the thickness direction B of the piezoelectric body 4 in which at least a part of the first electrode 5 is provided with respect to the piezoelectric body 4
  • the other side of the piezoelectric body 4 in the thickness direction B in which at least a part of the second electrode 6 is provided with respect to the piezoelectric body 4 is described as “back surface side”.
  • the front surface side of the ultrasonic vibrator 11 is a side that transmits and receives ultrasonic waves.
  • the back surface side of the ultrasonic vibrator 11 is the side opposite to the side that transmits and receives ultrasonic waves.
  • the piezoelectric body 4 of the piezoelectric element 1 is composed of, for example, a piezoelectric ceramic sheet.
  • the material of the piezoelectric ceramic sheet include piezoelectric ceramic materials such as lead zirconate titanate (PZT) and lithium niobate.
  • the piezoelectric body 4 may be formed of quartz instead of the piezoelectric ceramic material.
  • the first electrode 5 and the second electrode 6 of the piezoelectric element 1 are laminated as electrode layers on both sides of the piezoelectric body 4 in the thickness direction B by, for example, an ion plating method using a mask material, a vapor deposition method, or a sputtering method.
  • an ion plating method using a mask material e.g., aluminum, copper, nickel, and gold.
  • the material of the first electrode 5 and the second electrode 6 include metals such as silver, chromium, copper, nickel, and gold, and laminates of these metals.
  • the second electrode 6 of this embodiment is formed only on the back surface side of the piezoelectric element 1.
  • the first electrode 5 of this embodiment is composed of a folded electrode.
  • the first electrode 5 of the present embodiment includes a front electrode layer, a back electrode layer, and a connecting conductive portion.
  • the surface electrode layer is laminated on the surface side with respect to the piezoelectric body 4.
  • the back surface electrode layer is laminated on the back surface side with respect to the piezoelectric body 4.
  • the connecting conductive portion connects the front electrode layer and the back electrode layer.
  • the first electrode 5 of the present embodiment is formed from the front surface side to the back surface side of the piezoelectric element 1.
  • the back electrode layer of the first electrode 5 and the second electrode 6 can be arranged together on the back surface side of the piezoelectric element 1.
  • connection work between the electric signal line 14, the first electrode 5, and the second electrode 6 is made piezoelectric as compared with the case where the first electrode and the second electrode are arranged only on different surfaces of the piezoelectric element. This can be done only on one side of the element 1.
  • the acoustic matching member 3 is laminated so as to cover a part of the surface side of the piezoelectric element 1.
  • the acoustic matching member 3 is not limited to this configuration, and may be laminated so as to cover the entire surface side of the piezoelectric element 1.
  • the acoustic matching member 3 of the present embodiment constitutes an acoustic matching layer that enhances the propagation efficiency of ultrasonic waves.
  • the acoustic matching layer as the acoustic matching member 3 is formed by a method in which a sheet material forming the acoustic matching layer is attached to the piezoelectric element 1, a method in which a liquid acoustic matching material forming the acoustic matching layer is applied and cured, and the like. Can be formed.
  • the material of the acoustic matching member 3 include a resin material such as an epoxy resin.
  • the acoustic matching member 3 may be composed of a laminated body of resin layers made of a resin material.
  • the ultrasonic vibrator 11 of the present embodiment can absorb the ultrasonic energy of the ultrasonic waves emitted from the back surface of the piezoelectric body 4, and does not include a support member that supports the piezoelectric element 1 from the back surface side.
  • the ultrasonic vibrator 11 is not limited to this configuration, and may be configured to include a support member.
  • the support member is a sound absorber composed of, for example, rubber or an epoxy resin in which a metal powder such as tungsten powder is dispersed.
  • the housing 12 is provided with a sound absorbing wedge structure, which will be described later, so that the housing 12 is not provided with a support member like the ultrasonic vibrator 11 of the present embodiment.
  • the ultrasonic vibrator 11 can be downsized by providing no support member.
  • the housing 12 supports the ultrasonic vibrator 11.
  • the proximal end side of the housing 12 is connected to the drive shaft 13.
  • the housing 12 of the present embodiment is connected to the drive shaft 13 via the connector 15, it may be a housing connected without the connector 15.
  • the housing 12 can be formed by carving from a metal block, MIM (metal powder injection molding), or the like.
  • the constituent material of the housing 12 is not particularly limited, such as metal, ceramics, and resin.
  • the housing 12 of the present embodiment includes a housing body 16a made of non-conductive ceramics, resin, etc., and a conductive member 16b embedded in the housing body 16a and partially exposed from the housing body 16a. , Equipped with.
  • the conductive member 16b is made of a conductive metal.
  • the conductive member 16b is electrically connected to the first electrode 5 and the second electrode 6 of the ultrasonic vibrator 11. Further, the conductive member 16b is electrically connected to the electric signal line 14. As a result, the ultrasonic vibrator 11 is electrically connected to the electric signal line 14 via the conductive member 16b.
  • the housing body 16a includes a support base portion 17a that supports the back surface side of the ultrasonic vibrator 11.
  • the support base portion 17a is formed by a first support portion 17a1 that abuts on the back surface of the ultrasonic vibrator 11 at one end in the width direction C of the ultrasonic vibrator 11 and at the other end of the width direction C of the ultrasonic vibrator 11.
  • a second support portion 17a2 that comes into contact with the back surface of the ultrasonic vibrator 11 is provided.
  • the "width direction C" means a direction orthogonal to both the longitudinal direction A and the thickness direction B.
  • the support base portion 17a supports the ultrasonic vibrator 11 by contacting the back surface of the ultrasonic vibrator 11 at one end and the other end in the width direction C of the ultrasonic vibrator 11.
  • the support base portion 17a is not in contact with the back surface of the ultrasonic vibrator 11 between the first support portion 17a1 and the second support portion 17a2 in the width direction C.
  • the housing body 16a includes a cover portion 17b that covers the ultrasonic vibrator 11 on the back side (same as the back side of the ultrasonic vibrator 11) with respect to the piezoelectric body 4.
  • the cover portion 17b includes a plurality of ridge-shaped portions 17b1 that taper toward the ultrasonic vibrator 11 at a position facing the ultrasonic vibrator 11. Therefore, the surface of the cover portion 17b facing the back surface of the ultrasonic vibrator 11 has a concave-convex shape instead of a flat surface.
  • the cover portion 17b may be provided with a plurality of protruding portions that taper toward the ultrasonic vibrator 11 at a position facing the ultrasonic vibrator 11. good.
  • the ridge-shaped portion 17b1 will be described as an example, but the same applies to the protruding portion unless otherwise specified.
  • the ultrasonic energy attenuation performance of the housing 12 can be improved. Specifically, the ultrasonic energy of ultrasonic waves emitted from the back surface of the ultrasonic vibrator 11 enters a gap between a plurality of ridge-shaped portions 17b1 and is easily attenuated by repeating reflection in this gap. Therefore, it is possible to prevent the ultrasonic waves emitted from the back surface of the ultrasonic vibrator 11 from being reflected by the cover portion 17b toward the back surface of the ultrasonic vibrator 11. That is, it is possible to suppress the ultrasonic vibrator 11 from receiving ultrasonic waves that cause noise on the back surface thereof.
  • the cover portion 17b of the present embodiment partitions a plurality of slots 18 penetrating from the surface facing the ultrasonic vibrator 11 to the back surface located on the side opposite to the front surface. ..
  • the cover portion 17b of the present embodiment includes a partition portion 19 located between two adjacent slots 18 among the plurality of slots 18.
  • the partition portion 19 is provided with a ridge-shaped portion 17b1 that tapers toward the ultrasonic vibrator 11 on the surface side (upper side in FIG. 4).
  • the ridge-shaped portion 17b1 of the cover portion 17b of the present embodiment is formed in a portion of the partition portion 19 facing the back surface of the ultrasonic vibrator 11.
  • the gap between the ridge-shaped portions 17b1 in the present embodiment described above means the internal space of the slot 18 sandwiched between the two adjacent partition portions 19.
  • the ultrasonic energy of the ultrasonic waves emitted from the back surface of the ultrasonic vibrator 11 can be a plurality of ultrasonic energies. It enters the internal space of slot 18, which is the gap between the ridge-shaped portions 17b1, and repeatedly reflects and attenuates. Further, the ultrasonic energy that cannot be completely attenuated in the internal space of the slot 18 escapes from the slot 18 to the back side of the cover portion 17b. Therefore, it is possible to further suppress the ultrasonic vibrator 11 from receiving ultrasonic waves that cause noise on the back surface thereof.
  • the ridge-shaped portion 17b1 of the present embodiment tapers from the proximal end side (lower side in FIG. 4) to the distal end side (upper side in FIG. 4) in a cross-sectional view orthogonal to the longitudinal direction A shown in FIG.
  • the tilt angle changes.
  • the ridge-shaped portion 17b1 of the present embodiment has a first slope portion 51 inclined at a predetermined inclination angle ⁇ 1 with respect to the thickness direction B and the first slope portion 51 in the cross-sectional view shown in FIG.
  • the second slope portion 52 is provided, which extends continuously to the tip end side of the first slope portion 51 and is inclined at an inclination angle ⁇ 2 larger than that of the first slope portion 51 in the thickness direction B.
  • These two inclination angles ⁇ 1 and ⁇ 2 are not particularly limited, and may be appropriately set according to the attenuation efficiency of ultrasonic energy.
  • the plurality of ridge-shaped portions 17b1 in the cover portion 17b includes at least one ridge-shaped portion 17b1 that gradually tapers from the back surface side to the front surface side of the cover portion 17b. More specifically, all of the plurality of ridge-shaped portions 17b1 of the cover portion 17b of the present embodiment gradually taper from the back surface side to the front surface side of the cover portion 17b. With such a gradually tapering configuration, the ultrasonic waves emitted from the back surface of the ultrasonic vibrator 11 are on the surface of the cover portion 17b facing the back surface of the ultrasonic vibrator 11, and the ultrasonic vibrator 11 It is possible to further suppress the reflection toward the back surface. Therefore, as in the present embodiment, it is preferable that the ridge-shaped portion 17b1 has a sharp tip formed by the ridgeline where the two second slope portions 52 intersect.
  • the ultrasonic vibrator 11 and the cover portion 17b are separated from each other in a state where the support base portion 17a supports the ultrasonic vibrator 11.
  • the support base portion 17a supports the ultrasonic vibrator 11 in a state where the ultrasonic vibrator 11 and the cover portion 17b are separated from each other. That is, the ultrasonic vibrator 11 is not supported by the tip of the ridge-shaped portion 17b1 provided on the surface of the cover portion 17b facing the ultrasonic vibrator 11.
  • the support base portion 17a can support the ultrasonic vibrator 11 regardless of the dimensional accuracy of the uneven shape provided on the surface of the cover portion 17b facing the ultrasonic vibrator 11. Therefore, the positioning accuracy of the ultrasonic vibrator 11 in the housing 12 can be improved.
  • the plurality of slots 18 of the cover portion 17b of the present embodiment are partitioned at predetermined intervals in the width direction C. Further, the plurality of slots 18 and the partition portion 19 of the cover portion 17b of the present embodiment extend substantially parallel to the longitudinal direction A.
  • the plurality of slots 18 and the plurality of partition portions 19 of the present embodiment cover the entire area between the first support portion 17a1 and the second support portion 17a2 of the support base portion 17a in the width direction C, and the ultrasonic transducer 11 It is located on the back side of. By doing so, it is possible to prevent the ultrasonic waves emitted from the back surface of the ultrasonic vibrator 11 from being reflected toward the back surface of the ultrasonic vibrator 11 in a wide range in the width direction C. As a result, it is possible to prevent the ultrasonic vibrator 11 from receiving ultrasonic waves that cause noise on the back surface thereof.
  • the plurality of slots 18 and the plurality of partition portions 19 of the present embodiment are arranged on the back surface side of the ultrasonic vibrator 11 over the entire area where the ultrasonic vibrator 11 is located in the longitudinal direction A. By doing so, it is possible to prevent the ultrasonic waves emitted from the back surface of the ultrasonic vibrator 11 from being reflected toward the back surface of the ultrasonic vibrator 11 in a wide range in the longitudinal direction A. As a result, it is possible to prevent the ultrasonic vibrator 11 from receiving ultrasonic waves that cause noise on the back surface thereof.
  • the back surface of the cover portion 17b is composed of a flat surface portion 53 as a surface extending along the in-plane direction of the piezoelectric body 4. More specifically, the back surface of the cover portion 17b of the present embodiment is composed of the back surfaces of a plurality of partition portions 19.
  • the partition portion 19 of the present embodiment includes a flat surface portion 53 extending along the in-plane direction of the piezoelectric body 4 on the back surface side.
  • the back surface of the cover portion 17b may be configured to include a surface extending along the in-plane direction of the piezoelectric body 4, and the surface is not limited to the flat surface portion 53 of the present embodiment.
  • the "plane extending along the in-plane direction of the piezoelectric body" is not limited to a plane parallel to the in-plane direction of the piezoelectric body, and if it extends along the in-plane direction of the piezoelectric body, it is a convex surface.
  • the back surface of the partition portion 19 constituting the back surface of the cover portion 17b is a surface extending along the in-plane direction of the piezoelectric body 4, for example, the back surface has a ridge shape having a blunt tip than the ridge shape portion 17b1. It may be composed of the convex surface portion of. Further, the back surface of the partition portion 19 may be formed of, for example, a concave surface portion that is recessed toward the front surface side as long as it is a surface that extends along the in-plane direction of the piezoelectric body 4. From the viewpoint of the above-mentioned effect, the back surface of the partition portion 19 is preferably formed of a flat surface portion 53 rather than a convex surface portion or a concave surface portion.
  • the housing body 16a has a hollow portion 54 communicating with the slot 18 on the back surface side of the cover portion 17b.
  • the inner wall of the housing body 16a that partitions the hollow portion 54 is provided with a plurality of ridge-shaped portions 17b2 that taper toward the cover portion 17b at positions facing the cover portion 17b.
  • the inner wall of the housing body 16a that partitions the hollow portion 54 has a plurality of protrusions that taper toward the cover portion 17b at positions facing the cover portion 17b in addition to or in place of the ridge-shaped portion 17b2 described above. It may be provided with a site.
  • the ridge-shaped portion 17b2 will be described as an example, but the same applies to the protruding portion unless otherwise specified.
  • the ultrasonic energy attenuation performance of the housing 12 can be further improved.
  • the ultrasonic waves emitted from the back surface of the ultrasonic vibrator 11 pass through the slot 18 and enter the hollow portion 54, they can be reflected so as to be dispersed by the convex surfaces of the plurality of ridge-shaped portions 17b2. can.
  • the ultrasonic energy can be attenuated in the hollow portion 54.
  • the ultrasonic waves reflected from the plurality of ridge-shaped portions 17b2 toward the cover portion 17b can be reduced. Therefore, it is possible to prevent the ultrasonic vibrator 11 from receiving ultrasonic waves that become noise that has returned through the slot 18 on the back surface thereof.
  • the hollow portion 54 is partitioned by the semi-cylindrical portion and the cover portion 17b.
  • a ridge-shaped portion 17b2 is provided on the inner wall of the semi-cylindrical portion that partitions the hollow portion 54.
  • the plurality of ridge-shaped portions 17b2 of the present embodiment are rib-shaped convex portions extending in the longitudinal direction A.
  • a plurality of ridge-shaped portions 17b2 are provided at different positions in the circumferential direction.
  • the two ridge-shaped portions 17b2 adjacent to each other in the circumferential direction may be arranged continuously as in the present embodiment, or may be arranged apart from each other. This distance may be appropriately set according to the desired sound absorption performance.
  • the ridge-shaped portion 17b2 provided on the inner wall that partitions the hollow portion 54 is gradually tapered from the base end to the tip end.
  • the ridge-shaped portion 17b2 is preferably formed of a curved surface that is convexly curved in the cross-sectional view shown in FIG. By doing so, the ultrasonic waves are easily dispersed and reflected by the ridge-shaped portion 17b2.
  • the hollow portion 54 of the present embodiment is the distal end of the housing body 16a as the distal end of the housing 12 and communicates with the outside of the housing 12. Further, the slot 18 of the present embodiment communicates with the outside of the housing 12 on the proximal end side of the ultrasonic vibrator 11. Therefore, if the hollow portion 54 is filled with a resin-based adhesive from the distal end of the housing 12, the adhesive passes through not only the hollow portion 54 but also the slot 18 to the ultrasonic vibrator 11 and the cover portion 17b. The gap between them is filled. Since the slot 18 communicates with the outside of the housing 12 on the proximal end side of the ultrasonic vibrator 11, the air pushed out by the adhesive is discharged to the outside of the housing 12.
  • the inside of the hollow portion 54, the inside of the slot 18, and the gap between the ultrasonic vibrator 11 and the cover portion 17b can all be filled with the adhesive.
  • the first to third resin members 61 to 63, which will be described later, can be easily formed of the same material.
  • the housing body 16a includes a side wall portion 17c that covers the end surface of the ultrasonic vibrator 11 in the width direction C in a state where the ultrasonic vibrator 11 is supported by the support base portion 17a.
  • the side wall portion 17c includes a first side surface portion 17c1 that rises from the first support portion 17a1 of the support base portion 17a, and a second side surface portion 17c2 that rises from the second support portion 17a2 of the support base portion 17a.
  • the imaging core 60 of this embodiment includes a first resin member 61.
  • the first resin member 61 is located in the slot 18.
  • the acoustic impedance difference between the piezoelectric body 4 and the first resin member 61 is smaller than the acoustic impedance difference between the piezoelectric body 4 and air.
  • the imaging core 60 of this embodiment includes a second resin member 62.
  • the second resin member 62 is located in the hollow portion 54.
  • the acoustic impedance difference between the piezoelectric body 4 and the second resin member 62 is smaller than the acoustic impedance difference between the piezoelectric body 4 and air.
  • the imaging core 60 of the present embodiment includes a third resin member 63.
  • the third resin member 63 is interposed between the ultrasonic vibrator 11 and the cover portion 17b.
  • the acoustic impedance difference between the piezoelectric body 4 and the third resin member 63 is smaller than the acoustic impedance difference between the piezoelectric body 4 and air.
  • the first resin member 61, the second resin member 62, and the third resin member 63 may be made of the same material.
  • the first resin member 61, the second resin member 62, and the third resin member 63 are, for example, a resin as a main component, and can be composed of a silicone rubber-based adhesive, an epoxy resin-based adhesive, or the like.
  • the hollow portion 54, the slot 18, and the gap between the ultrasonic vibrator 11 and the cover portion 17b are all filled with a resin-based adhesive and solidified to form the first to first steps. 3
  • Resin members 61 to 63 can be easily formed of the same material.
  • the drive shaft 13 is made of a flexible tubular body. Inside the drive shaft 13, an electric signal line 14 connected to the ultrasonic vibrator 11 is arranged.
  • the drive shaft 13 is composed of, for example, a multi-layer coil having different winding directions around the shaft. Examples of the coil material include stainless steel and Ni-Ti (nickel-titanium) alloys.
  • the drive shaft 13 passes through the inside of the inner pipe member 30 and the outer pipe member 40 and extends to a hub 32, which will be described later, located at the proximal end of the inner pipe member 30. That is, the drive shaft 13 extends from the distal end of the insertion portion 110a to the proximal end of the operation portion 110b in the longitudinal direction A.
  • the electric signal line 14 extends in the drive shaft 13 and electrically connects the ultrasonic vibrator 11 and the external device 120. That is, the electric signal line 14 extends from the distal end of the insertion portion 110a to the proximal end of the operation portion 110b in the longitudinal direction A, similarly to the drive shaft 13.
  • a plurality of electric signal lines 14 are provided, and each electric signal line 14 is the first of the above-mentioned piezoelectric elements 1 via the connector 15 and the conductive member 16b of the housing 12. It is connected to the electrode 5 or the second electrode 6.
  • the plurality of electric signal lines 14 are composed of, for example, a twisted pair cable in which two electric signal lines 14 are twisted together.
  • Each electric signal line 14 can be a flexible thin wire member having an outer diameter of more than 0 mm and 0.1 mm or less.
  • Each electric signal line 14 can be composed of, for example, a conductor wire larger than 0 mm and 0.05 mm or less, and a coating material formed of an insulating material and covering the periphery of the conductor wire.
  • the sheath 20 partitions the first hollow portion 21a and the second hollow portion 21b.
  • the ultrasonic probe 10 is housed in the first hollow portion 21a.
  • the ultrasonic probe 10 can move back and forth in the longitudinal direction A in the first hollow portion 21a.
  • a guide wire W can be inserted into the second hollow portion 21b.
  • the tubular guide wire insertion portion 20b that partitions the second hollow portion 21b is parallel to each other with respect to the distal end portion of the tubular main body portion 20a that partitions the first hollow portion 21a. It is located so that it becomes.
  • the main body portion 20a and the guide wire insertion portion 20b can be formed by joining different pipe members by heat fusion or the like, but the forming method is not limited to this.
  • the main body 20a is provided with a marker 22 having X-ray contrast property, which is formed of a material that is opaque to X-rays. Further, the guide wire insertion portion 20b is also provided with a marker 23 having X-ray contrast property.
  • the markers 22 and 23 can be configured by, for example, a metal coil having high X-ray impermeableness such as platinum, gold, iridium, and tungsten.
  • a window portion 24 formed in which the transparency of ultrasonic waves is higher than that of other parts is formed. More specifically, the window portion 24 of the present embodiment is formed on the main body portion 20a of the sheath 20.
  • the window portion 24 of the main body portion 20a and the guide wire insertion portion 20b are formed of a flexible material, and the material is not particularly limited.
  • the constituent material include various thermoplastic elastomers such as polyethylene, styrene, polyolefin, polyurethane, polyester, polyamide, polyimide, polybutadiene, transpolyisoprene, fluororubber, and chlorinated polyethylene, and one of them.
  • a polymer alloy in which two or more kinds are combined, a polymer blend, a laminate, or the like can also be used.
  • the proximal end side of the main body portion 20a with respect to the window portion 24 has a reinforcing portion reinforced with a material having a higher rigidity than the window portion 24.
  • the reinforcing portion is formed, for example, by disposing a reinforcing material in which a metal wire such as stainless steel is braided in a mesh shape on a flexible tubular member such as resin.
  • the tubular member is made of the same material as the window portion 24.
  • hydrophilic lubricating coating layer that exhibits lubricity when wet on the outer surface of the sheath 20.
  • a communication hole 25 that communicates the inside and the outside of the first hollow portion 21a is formed at the distal end of the main body portion 20a of the sheath 20. At the time of priming, the gas in the main body 20a can be discharged through the communication hole 25.
  • the inner pipe member 30 includes an inner pipe 31 and a hub 32.
  • the inner pipe 31 is inserted so as to be movable back and forth in the outer pipe member 40.
  • the hub 32 is provided on the proximal end side of the inner tube 31.
  • the outer tube member 40 includes an outer tube 41, a distal end side connector 42, and a proximal end side connector 43.
  • the outer pipe 41 is located on the outer side in the radial direction of the inner pipe 31, and the inner pipe 31 moves back and forth inside the outer pipe 41.
  • the distal end side connector 42 connects the proximal end portion of the main body portion 20a of the sheath 20 and the distal end portion of the outer tube 41.
  • the proximal end side connector 43 is provided at the proximal end portion of the outer tube 41, and is configured to receive the inner tube 31 in the outer tube 41.
  • the drive shaft 13 and the electric signal line 14 of the ultrasonic probe 10 described above are the main body 20a of the sheath 20, the outer tube member 40 connected to the proximal end side of the main body 20a, and the outer tube member. It extends to the hub 32 located at the proximal end of the inner tube member 30, which is partially inserted into the 40.
  • the ultrasonic probe 10 and the inner tube member 30 described above are connected to each other so as to move back and forth in the longitudinal direction A integrally. Therefore, for example, when the inner pipe member 30 is pushed in the insertion direction A1, the inner pipe member 30 is pushed into the outer pipe member 40 in the insertion direction A1. When the inner tube member 30 is pushed into the outer tube member 40 toward the insertion direction A1, the ultrasonic probe 10 connected to the inner tube member 30 moves in the main body 20a of the sheath 20 in the insertion direction A1. do. On the contrary, when the inner pipe member 30 is pulled in the pulling direction A2, the inner pipe member 30 is pulled out from the outer pipe member 40 in the pulling direction A2. When the inner tube member 30 is pulled out from the inside of the outer tube member 40 in the removal direction A2, the ultrasonic probe 10 connected to the inner tube member 30 moves in the main body 20a of the sheath 20 in the removal direction A2.
  • the distal end portion of the inner tube member 30 reaches the vicinity of the distal end side connector 42 of the outer tube member 40.
  • the ultrasonic transducer 11 of the ultrasonic probe 10 is located near the distal end of the main body 20a of the sheath 20.
  • the stopper portion is not particularly limited as long as it can realize the above function, and may be configured by, for example, a wall portion that abuts the outer pipe member 40 at a predetermined position in the longitudinal direction A.
  • a connector portion that is mechanically and electrically connected to the external device 120 is provided at the proximal end of the hub 32 of the inner pipe member 30. That is, the diagnostic imaging catheter 110 is mechanically and electrically connected to the external device 120 by a connector portion provided on the hub 32 of the inner tube member 30. More specifically, the electric signal line 14 of the ultrasonic probe 10 extends from the ultrasonic transducer 11 to the connector portion of the hub 32, and the connector portion of the hub 32 is connected to the external device 120. Then, the ultrasonic vibrator 11 and the external device 120 are electrically connected. The received signal in the ultrasonic vibrator 11 is transmitted to the external device 120 via the connector portion of the hub 32, is subjected to predetermined processing, and is displayed as an image.
  • the external device 120 includes a motor 121 which is a power source for rotating the drive shaft 13 and a motor 122 which is a power source for moving the drive shaft 13 in the longitudinal direction A. ..
  • the rotational motion of the motor 122 is converted into axial motion by the ball screw 123 connected to the motor 122.
  • the drive unit 120a, the control device 120b electrically connected to the drive unit 120a by wire or wirelessly, and the control device 120b are the diagnostic imaging catheter 110.
  • a monitor 120c capable of displaying an image generated based on a received signal received from is provided.
  • the motor 121, the motor 122, and the ball screw 123 described above in this embodiment are provided in the drive unit 120a.
  • the operation of the drive unit 120a is controlled by the control device 120b.
  • the control device 120b can be configured by a processor including a CPU and a memory.
  • the external device 120 is not limited to the configuration shown in the present embodiment, and may be further provided with an external input unit such as a keyboard, for example.
  • the ultrasonic probe according to the present disclosure is not limited to the specific configuration specified in the above-described embodiment, and can be variously modified or modified as long as it does not deviate from the gist of the invention described in the claims. ..
  • the imaging core 60 of the ultrasonic probe 10 of the above-described embodiment has a configuration including only an ultrasonic transducer 11 that enables intravascular ultrasonic diagnosis, but is not limited to this configuration, and is not limited to this configuration, for example, an optical coherence tomography. It may be configured to further include an optical transmission / reception unit that enables diagnosis (Optical Coherence Tomography, abbreviated as “OCT”).
  • OCT optical Coherence Tomography
  • This disclosure relates to an ultrasonic probe.
  • Piezoelectric element 3 Acoustic matching member 4: Piezoelectric body 5: First electrode 6: Second electrode 10: Ultrasonic probe 11: Ultrasonic transducer 12: Housing 13: Drive shaft 14: Electrical signal line 15: Connector 16a: Housing body 16b: Conductive member 17a: Support base 17a1: First support 17a2: Second support 17b: Cover 17b1: Ridge-shaped part 17b2: Ridge-shaped part 17c: Side wall 17c1: First Side surface portion 17c2: Second side surface portion 18: Slot 19: Partition portion 20: Sheath 20a: Main body portion 20b: Guide wire insertion portion 21a: First hollow portion 21b: Second hollow portion 22, 23: Marker 24: Window portion 25 : Communication hole 30: Inner pipe member 31: Inner pipe 32: Hub 40: Outer pipe member 41: Outer pipe 42: Distal end side connector 43: Proximal end side connector 51: First slope portion 52: Second slope portion 53: Flat portion 54: Hollow portion 60: Imaging core 61: First resin member 62: Second resin member 63:

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Abstract

L'invention concerne une sonde à ultrasons, laquelle comporte: un transducteur à ultrasons; et un boîtier supportant le transducteur à ultrasons. Le transducteur à ultrasons comporte: un corps piézoélectrique plat; une première électrode stratifiée sur au moins le premier côté du corps piézoélectrique, dans le sens de l'épaisseur de ce corps piézoélectrique; et une deuxième électrode stratifiée sur au moins le deuxième côté du corps piézoélectrique, dans le sens de l'épaisseur de ce corps piézoélectrique. Le boîtier comporte une partie enveloppe qui recouvre le transducteur à ultrasons sur le deuxième côté du corps piézoélectrique plat. La partie enveloppe comporte, dans un emplacement face au transducteur à ultrasons, plusieurs positions en forme de bosse ou de crête, lesquelles vont en s'amenuisant en direction du transducteur à ultrasons.
PCT/JP2021/009374 2020-03-16 2021-03-09 Sonde a ultrasons WO2021187252A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2020-045807 2020-03-16
JP2020045807A JP7403358B2 (ja) 2020-03-16 2020-03-16 超音波探触子

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WO2021187252A1 true WO2021187252A1 (fr) 2021-09-23

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JP (1) JP7403358B2 (fr)
WO (1) WO2021187252A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005103078A (ja) * 2003-09-30 2005-04-21 Matsushita Electric Ind Co Ltd 超音波探触子
JP2011528929A (ja) * 2008-07-22 2011-12-01 ヒューマンスキャン・カンパニー・リミテッド ヒートシンクを有する超音波プローブ
JP2014124430A (ja) * 2012-12-27 2014-07-07 Seiko Epson Corp 超音波トランスデューサー装置、プローブ、電子機器および超音波診断装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005103078A (ja) * 2003-09-30 2005-04-21 Matsushita Electric Ind Co Ltd 超音波探触子
JP2011528929A (ja) * 2008-07-22 2011-12-01 ヒューマンスキャン・カンパニー・リミテッド ヒートシンクを有する超音波プローブ
JP2014124430A (ja) * 2012-12-27 2014-07-07 Seiko Epson Corp 超音波トランスデューサー装置、プローブ、電子機器および超音波診断装置

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JP2021145725A (ja) 2021-09-27

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