WO2015001822A1 - 超音波振動デバイス、超音波振動デバイスの製造方法および超音波医療装置 - Google Patents
超音波振動デバイス、超音波振動デバイスの製造方法および超音波医療装置 Download PDFInfo
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- WO2015001822A1 WO2015001822A1 PCT/JP2014/058425 JP2014058425W WO2015001822A1 WO 2015001822 A1 WO2015001822 A1 WO 2015001822A1 JP 2014058425 W JP2014058425 W JP 2014058425W WO 2015001822 A1 WO2015001822 A1 WO 2015001822A1
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- Prior art keywords
- laminated
- case
- vibrator
- main body
- ultrasonic vibration
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Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
- B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
- B06B1/0607—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using multiple elements
- B06B1/0611—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using multiple elements in a pile
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N7/00—Ultrasound therapy
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/01—Manufacture or treatment
- H10N30/05—Manufacture of multilayered piezoelectric or electrostrictive devices, or parts thereof, e.g. by stacking piezoelectric bodies and electrodes
- H10N30/057—Manufacture of multilayered piezoelectric or electrostrictive devices, or parts thereof, e.g. by stacking piezoelectric bodies and electrodes by stacking bulk piezoelectric or electrostrictive bodies and electrodes
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/50—Piezoelectric or electrostrictive devices having a stacked or multilayer structure
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/80—Constructional details
- H10N30/88—Mounts; Supports; Enclosures; Casings
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/32—Surgical cutting instruments
- A61B17/320068—Surgical cutting instruments using mechanical vibrations, e.g. ultrasonic
- A61B2017/320069—Surgical cutting instruments using mechanical vibrations, e.g. ultrasonic for ablating tissue
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/32—Surgical cutting instruments
- A61B17/320068—Surgical cutting instruments using mechanical vibrations, e.g. ultrasonic
- A61B2017/320071—Surgical cutting instruments using mechanical vibrations, e.g. ultrasonic with articulating means for working tip
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/32—Surgical cutting instruments
- A61B17/320068—Surgical cutting instruments using mechanical vibrations, e.g. ultrasonic
- A61B2017/320089—Surgical cutting instruments using mechanical vibrations, e.g. ultrasonic node location
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B2018/00571—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body for achieving a particular surgical effect
- A61B2018/00589—Coagulation
Definitions
- the present invention relates to an ultrasonic vibration device that excites ultrasonic vibration, a method of manufacturing the ultrasonic vibration device, and an ultrasonic medical apparatus including the ultrasonic vibration device.
- Some ultrasonic treatment tools that perform coagulation / incision treatment of living tissue using ultrasonic vibration include a Langevin type vibrator built in the handpiece as an ultrasonic vibration source.
- Such a Langevin type vibrator is disclosed in Patent Document 1, for example.
- a technique is proposed in which a plurality of piezoelectric elements are stacked and housed in a vibration block to prevent a short circuit due to contamination of the piezoelectric elements.
- the shape of the piezoelectric element disclosed in Patent Document 1 is processed into a disk shape. For this reason, when the piezoelectric element is cut out from the piezoelectric material wafer into a disk shape, there is a drawback that the number to be obtained is reduced. Therefore, it is preferable that the piezoelectric elements are cut into a rectangular shape so that a large number can be obtained.
- Patent Document 1 positions the piezoelectric elements by laminating a plurality of piezoelectric elements in the vibration block.
- the accuracy and the stacking accuracy are determined only by the electrode pieces that are in contact with the stacked piezoelectric elements. For this reason, it is very difficult to accurately position the plurality of piezoelectric elements, and there is a possibility that the side surface of the vibrating body comes into contact with the inner wall of the vibration block by fastening in assembly.
- the present invention has been made in view of the above problems, and the object of the present invention is to improve productivity and to enable accurate positioning and stacking without interfering with the case member, and output by vibration damping. It is intended to provide an ultrasonic vibration device, a method for manufacturing an ultrasonic vibration device, and an ultrasonic medical device that prevent problems such as a decrease, generation of wear powder, and short circuit failure.
- An ultrasonic vibration device includes a laminated vibrator in which a plurality of piezoelectric bodies and a plurality of electrode plates are laminated, and an outer shape having a polygonal column shape, and disposed at both ends of the laminated vibrator.
- a pressure member to be fixed, and the laminated vibrator and the insulating member are held in the polygonal column shape in the case body, and the laminated vibrator is not in contact with an inner wall of the case body and is insulated.
- a plurality of positioning member insertion portions for inserting a positioning member for positioning at a position where one end of the member contacts the pressure member.
- the manufacturing method of the ultrasonic vibration device includes a laminated vibrator in which a plurality of piezoelectric bodies and a plurality of electrode plates are laminated, and an outer shape having a polygonal column shape, and both ends of the laminated vibrator.
- a pressure member that pressurizes and fixes the laminated vibrator and the insulating member in the polygonal column shape in the case body, and the laminated vibrator is not in contact with the inner wall of the case body
- a plurality of positioning member insertion portions for inserting positioning members for positioning one end of the insulating member at a position in contact with the pressure member, the method for manufacturing an ultrasonic vibration device,
- the laminated vibrator having edge members disposed at both ends is accommodated in a position not in contact with the inner wall of the case body, and a V-shaped groove is formed at the tip of the plurality of positioning member insertion portions of the case body.
- a plurality of positioning members are inserted, the V-shaped grooves of the positioning members are applied to diagonal corners of the laminated body composed of the insulating member and the laminated vibrator, and the laminated body is placed in the case body.
- the pressure member is screwed and fastened to the case body, and the laminate is pressurized and fixed by the pressure member and the bottom of the case body,
- the plurality of positioning members are retracted from the positioning member insertion portion and removed.
- an ultrasonic medical device includes a laminated vibrator in which a plurality of piezoelectric bodies and a plurality of electrode plates are laminated, and an outer shape having a polygonal column shape, and disposed at both ends of the laminated vibrator.
- An insulating member, a case main body that accommodates the piezoelectric vibrator and the insulating member, and screwed into the opening of the case main body and fastened, and the laminated vibrator and the insulating member are added inside the case main body.
- An ultrasonic vibration device comprising: a plurality of positioning member insertion portions for inserting a positioning member for positioning one end of the insulating member at a position in contact with the pressure member; and an ultrasonic wave generated by the ultrasonic vibration device Wave oscillation is anda probe tip of treating a transmitted living tissue.
- productivity can be improved and positioning and lamination can be performed accurately without interfering with the case member, thereby preventing problems such as a decrease in output due to vibration damping, generation of wear powder, and short circuit failure.
- the ultrasonic vibration device, the method for manufacturing the ultrasonic vibration device, and the ultrasonic medical apparatus can be provided.
- Sectional drawing which shows the whole structure of the ultrasonic medical device which concerns on the 1st Embodiment of this invention
- the perspective view showing the configuration of the vibrator unit The exploded perspective view which shows the structure of the laminated body which consists of an insulating member, a rectangular piezoelectric material, and an electrode plate similarly
- the exploded perspective view showing the configuration of the vibrator unit The exploded perspective view showing the assembled state of the ultrasonic transducer Sectional view showing the assembled state of the ultrasonic transducer
- the perspective view which shows the structure of the case main body of a modification same as the above
- Sectional drawing which shows the assembly state of the ultrasonic transducer
- the perspective view which shows the structure of the case main body which concerns on the 2nd Embodiment of this invention.
- maintained by the positioning member similarly Sectional view showing the assembled state of the ultrasonic transducer
- the exploded perspective view which shows the assembly state of the ultrasonic transducer
- the exploded perspective view which shows the assembly state of the ultrasonic transducer
- the fragmentary sectional view of the state which pressed the laminated body which consists of an insulating member, a rectangular piezoelectric material, and an electrode plate with a positioning member within a case member, and was pressurized with the cover body based on
- FIG. 4 is a partial cross-sectional view showing a state in which a laminated body including an insulating member, a rectangular piezoelectric body, and an electrode plate is positioned by a positioning member in the case member and pressed by a lid according to the first embodiment.
- a partial cross-sectional view showing a state in which a laminated body in which a negative tendency tolerance has occurred in the insulating member, the rectangular piezoelectric body, and the electrode plate is positioned by the positioning member in the case member and pressed by the lid body.
- the perspective view which shows the structure of the cover body which concerns on a 2nd aspect similarly.
- FIG. 6 is a partial cross-sectional view showing a state in which a laminated body including an insulating member, a rectangular piezoelectric body, and an electrode plate is positioned by a positioning member in the case member and pressed by a lid according to the second embodiment.
- the perspective view which shows the structure of the cover body which concerns on a 3rd aspect same as the above.
- FIG. 4 is a partial cross-sectional view showing a state in which a laminated body including an insulating member, a rectangular piezoelectric body, and an electrode plate is positioned by a positioning member in the case member and pressed by a lid according to the third embodiment.
- the exploded perspective view which shows the structure of the ultrasonic transducer
- FIG. 11 is a partial cross-sectional view showing a state in which a laminated body including an insulating member, a rectangular piezoelectric body, and an electrode plate is positioned by a positioning member in the case member and pressed by a lid body according to the fourth embodiment.
- FIG. 28 is a sectional view of the ultrasonic transducer along the line XXIX-XXIX in FIG.
- FIG. 1 is a cross-sectional view showing the overall configuration of the ultrasonic medical device
- FIG. 2 is a diagram showing the overall schematic configuration of the transducer unit
- FIG. 3 is a perspective view showing the configuration of the transducer unit
- FIG. 5 is an exploded perspective view showing a configuration of a laminated body composed of a member, a rectangular piezoelectric body and an electrode plate
- FIG. 5 is an exploded perspective view showing a configuration of a vibrator unit
- FIG. 6 is an exploded perspective view showing an assembled state of an ultrasonic vibrator.
- 7 is a cross-sectional view showing an assembled state of the ultrasonic transducer
- FIG. 1 is a cross-sectional view showing the overall configuration of the ultrasonic medical device
- FIG. 2 is a diagram showing the overall schematic configuration of the transducer unit
- FIG. 3 is a perspective view showing the configuration of the transducer unit
- FIG. 5 is an exploded perspective view showing a configuration of a laminated body composed of
- FIG. 8 is a perspective view showing a configuration of a case body according to a modified example
- FIG. 9 is a case body according to a modified example different from FIG.
- FIG. 10 is a cross-sectional view showing an assembled state of the ultrasonic transducer of the modified example of FIGS. 8 and 9.
- An ultrasonic medical device 1 shown in FIG. 1 mainly treats an affected part using a vibrator unit 3 having an ultrasonic vibrator 2 as an ultrasonic device that generates ultrasonic vibration, and the ultrasonic vibration.
- a handle unit 4 is provided.
- the handle unit 4 includes an operation unit 5, an insertion sheath unit 8 including a long mantle tube 7, and a distal treatment unit 30.
- the proximal end portion of the insertion sheath portion 8 is attached to the operation portion 5 so as to be rotatable about the axis.
- the distal treatment section 30 is provided at the distal end of the insertion sheath section 8.
- the operation unit 5 of the handle unit 4 includes an operation unit main body 9, a fixed handle 10, a movable handle 11, and a rotary knob 12.
- the operation unit body 9 is formed integrally with the fixed handle 10.
- a slit 13 through which the movable handle 11 is inserted is formed on the back side of the connecting portion between the operation unit main body 9 and the fixed handle 10.
- the upper part of the movable handle 11 extends into the operation unit main body 9 through the slit 13.
- a handle stopper 14 is fixed to the lower end of the slit 13.
- the movable handle 11 is rotatably attached to the operation unit main body 9 via a handle support shaft 15.
- the movable handle 11 is opened and closed with respect to the fixed handle 10 as the movable handle 11 rotates about the handle support shaft 15.
- a substantially U-shaped connecting arm 16 is provided at the upper end of the movable handle 11.
- the insertion sheath portion 8 includes a mantle tube 7 and an operation pipe 19 that is inserted into the mantle tube 7 so as to be movable in the axial direction.
- a large diameter portion 18 having a diameter larger than that of the distal end portion is formed at the proximal end portion of the outer tube 7.
- the rotary knob 12 is mounted around the large diameter portion 18.
- a ring-shaped slider 20 is provided on the outer peripheral surface of the operation pipe 19 so as to be movable along the axial direction.
- a fixing ring 22 is disposed behind the slider 20 via a coil spring (elastic member) 21.
- the proximal end portion of the grip portion 23 is connected to the distal end portion of the operation pipe 19 via an action pin so as to be rotatable.
- This gripping part 23 constitutes a treatment part of the ultrasonic medical device 1 together with the distal end part 31 of the probe 6.
- the vibrator unit 3 As shown in FIG. 2, the transducer unit 3 integrally assembles an ultrasonic transducer 2 and a probe 6 that is a rod-shaped vibration transmission member that transmits ultrasonic vibration generated by the ultrasonic transducer 2. It is a thing.
- the ultrasonic vibrator 2 is provided with a horn 32 that amplifies the amplitude.
- the horn 32 is made of duralumin or a titanium alloy such as 64Ti.
- the horn 32 is formed in a conical shape whose outer diameter becomes narrower toward the distal end side, and an outward flange 33 for fixing to the operation section main body 9 (see FIG. 1) is formed in the middle outer periphery.
- a proximal cylindrical portion 38 is provided behind the outward flange 33.
- the probe 6 has a probe body 34 formed of a titanium alloy such as 64Ti. On the proximal end side of the probe main body 34, the ultrasonic transducer 2 connected to the horn 32 is disposed. In this way, the transducer unit 3 in which the probe 6 and the ultrasonic transducer 2 are integrated is formed.
- the ultrasonic vibration generated by the ultrasonic vibrator 2 is amplified by the horn 32 and then transmitted to the tip 31 side of the probe 6.
- the distal end portion 31 of the probe 6 is formed with a later-described treatment portion for treating living tissue.
- two rubber linings 35 that are formed in a ring shape with elastic members are attached at several positions of vibration node positions in the middle of the axial direction. These rubber linings 35 prevent contact between the outer peripheral surface of the probe main body 34 and an operation pipe 19 described later.
- the probe 6 as a transducer-integrated probe is inserted into the operation pipe 19.
- the rubber lining 35 prevents contact between the outer peripheral surface of the probe main body 34 and the operation pipe 19.
- the ultrasonic transducer 2 is electrically connected via an electric cable 36 to a power supply main body (not shown) that supplies a current for generating ultrasonic vibration.
- the ultrasonic transducer 2 is driven by supplying power from the power supply device body of the external device to the ultrasonic transducer 2 through the wiring in the electric cable 36.
- the ultrasonic vibrator 2 As the laminated ultrasonic vibration device of the present invention will be described below.
- the ultrasonic transducer 2 of the transducer unit 3 is laminated in a rectangular shape (square prism shape) in a case member 50 connected to the proximal cylindrical portion 38 behind the horn 32.
- the laminated vibrator 41 is incorporated.
- the laminated vibrator 41 is formed by laminating rectangular piezoelectric bodies 61 formed in a polygonal shape, in this case, a rectangular shape.
- This laminated vibrator 41 is provided with insulating members 42 and 43 formed in a polygonal shape, in this case, a rectangular shape from ceramics or the like on both ends, and the two insulating members 42 and 43 move back and forth (up and down on the paper surface, In the following description, there are cases where the top and bottom of the paper are also referred to as front and back).
- the rectangular piezoelectric body 61 of the present embodiment includes a piezoelectric material such as lead zirconate titanate (PZT, Pb (Zrx, Ti 1-x ) O 3) or a piezoelectric single crystal lithium niobate single crystal (LiNbO 3).
- PZT lead zirconate titanate
- Pb Zrx, Ti 1-x ) O 3
- LiNbO 3 piezoelectric single crystal lithium niobate single crystal
- PZT lead titanate zirconate
- Piezoelectric single crystal lithium niobate single crystal (LiNbO3) is one of the lead-free piezoelectric materials with high mechanical Q value suitable for high power use ultrasonic vibrators, and does not use lead, Suitable for environment.
- the laminated vibrator 41 includes a positive electrode side electrode plate 62 which is a positive electrode layer formed from a metal such as copper between the insulating member 42, the eight rectangular piezoelectric bodies 61 and the insulating member 43 in a polygonal shape, here a rectangular shape. And the negative electric side electrode plate 63 used as a negative electrode layer is interposed alternately.
- the laminated vibrator 41 is laminated so that four corners and four sides of the insulating members 42 and 43, the eight rectangular piezoelectric bodies 61, and the electrode plates 62 and 63 coincide with each other. Is formed into a substantially quadrangular prism shape. That is, the insulating members 42 and 43, the rectangular piezoelectric bodies 61, and the electrode plates 62 and 63 have a rectangular shape having substantially the same front and back surfaces.
- the insulating members 42 and 43, the respective rectangular piezoelectric bodies 61, and the respective electrode plates 62 and 63 are not limited to a rectangular surface shape, but are configured as polygons and laminated in a polygonal column shape as a whole. Also good. That is, the insulating plates 42 and 43, the rectangular piezoelectric body 61, and the electrode plates 62 and 63 may be polygons each having a shape having at least two common corners.
- lead-out portions 62a and 63a as electrodes extend from the approximate center of one side of each. These lead-out portions 62a and 63a are stacked so as to extend in different directions in which the positive and negative electric sides are separated from each other, and the positive and negative electric wires in the electric cable 36 shown in FIGS. And electrically connected.
- the case member 50 includes a substantially cylindrical lid body 51 as a pressurizing member, and a bottomed cylindrical case body 52 to which the lid body 51 is screwed into one end opening and fastened. It is configured.
- the lid 51 and the case main body 52 are made of duralumin or a titanium alloy such as 64Ti.
- the lid 51 has a flat part 51a for a jig for fastening to the case body 52 formed at a position symmetrical to the center point of the outer peripheral part. Further, the lid 51 is formed with a female screw hole 51b into which a male screw 38a extending from the proximal cylindrical portion 38 of the horn 32 is screwed at the center of one end, and to the case main body 52 at the other end. It has a male screw part 51c for screwing.
- the case body 52 is formed with a female screw portion 52a into which the male screw portion 51c of the lid 51 is screwed in the opening portion, and has two wiring lead-out portions 53 and two positioning member insertion portions 54 as openings on the outer peripheral portion.
- the wiring lead-out portion 53 and the positioning member insertion portion 54 are slits formed in the longitudinal axis direction of the case main body 52, and a total of four are formed in the side peripheral portion of the case main body 52.
- Each of the wiring lead-out portion 53 and the positioning member insertion portion 54 is formed at a point-symmetrical position around the central axis of the case main body 52.
- the lid body 51 is screwed and fastened to the case body 52.
- a horn 32 is screwed to the lid 51 and fastened to the ultrasonic transducer 2.
- the lid body 51 of the case member 50 that houses the laminated transducer 41 constitutes a front mass
- the bottom portion 55 of the case main body 52 constitutes a back mass.
- the insulating members 42 and 43, the rectangular piezoelectric body 61, and the electrode plates 62 and 63 are stacked and accommodated inside the case main body 52.
- the rectangular piezoelectric body 61 and the electrode plates 62 and 63 are accommodated in positions that do not contact the inner wall (side wall) of the case body 52.
- the insulating members 42 and 43 are in contact with the laminated vibrator 41, and the non-contact state is maintained on the side wall of the case body 52, and only the insulating members 42 and 43 are in contact with the bottom 55 of the case body 52 and the lid body. It will be in the state which contacts 51. And the surface where the insulating members 42 and 43 contact is only the surface in the stacking direction (vibration direction of the stacked vibrator 41).
- the lead-out portions 62 a and 63 a of the electrode plates 62 and 63 are arranged so as to be led out from the wiring lead-out portion 53 formed in the case main body 52.
- two positioning members 100 having a T-shaped cross section with a V-shaped groove 101 formed at the tip are inserted into the positioning member insertion portion 54 formed in the case main body 52.
- the V-shaped groove of the positioning member 100 is formed at the corners that are separated from each other on the diagonal line of the laminate in which the insulating members 42 and 43, the rectangular piezoelectric body 61, and the electrode plates 62 and 63 are laminated.
- 101 is applied and positioned at a desired position with high stacking accuracy.
- the length of the positioning member 100 is set to be substantially the same as or slightly shorter than the height of the laminated body in which the insulating members 42 and 43, the rectangular piezoelectric body 61, and the electrode plates 62 and 63 are laminated. ing.
- the lid 51 that is a pressure member is fastened to the case main body 52 by screwing, and the laminated vibrator 41 is insulated from the insulating member 42 by the surface of the male thread 51c of the lid 51 and the surface of the bottom 55 of the case main body 52. , 43 together with pressure. That is, the lid body 51 and the case main body 52 are fastened and are integrally assembled so that the insulating members 42 and 43 and the laminated vibrator 41 do not move. Thereafter, the two positioning members 100 are retracted from the positioning member insertion portion 54 and removed.
- the ultrasonic transducer 2 when the lid 51 and the case main body 52 are fastened, the ultrasonic transducer 2 according to the present embodiment has the V-shaped groove 101 of the positioning member 100 as the insulating members 42 and 43 and the rectangular piezoelectric body 61.
- the rectangular members By being applied to the corners of the laminate composed of the electrode plates 62 and 63, the rectangular members having the corners and sides of the insulating members 42 and 43 and the rectangular piezoelectric body 61 and the electrode plates 62 and 63 coincided with each other. Fixed to be maintained.
- the insulating members 42 and 43, the rectangular piezoelectric body 61, and the electrode plates 62 and 63 that are stacked and accommodated in the case main body 52 are fixed in a state of being pressed in the case member 50 in a quadrangular prism shape. Retained.
- the ultrasonic transducer 2 is made of a lead-free single crystal material having a heat resistance such as lead dilithate titanate (PZT) or lithium niobate (LiNbO3), which has particularly poor workability, in a rectangular shape.
- PZT lead dilithate titanate
- LiNbO3 lithium niobate
- the ultrasonic vibrator 2 can simultaneously enclose and pressurize the laminated vibrator 41 in the case member 50 at the time of assembly, the productivity is improved, and the laminated vibrator 41 constitutes a front mass in the case member 50. Since the lid 51 and the bottom 55 of the case main body 52 constituting the back mass are not in contact with each other and do not interfere with each other, it is possible to achieve a highly efficient configuration that prevents problems such as a decrease in output due to vibration damping, generation of wear powder, and short-circuit failure. .
- the wiring lead-out portion 53 and the positioning member insertion portion 54 formed on the outer peripheral portion of the case main body 52 of the case member 50 may be configured as the same slits 56 and 57 as shown in FIG.
- the slit 57 in FIG. 9 has a configuration in which the wiring lead-out portion 53 and the positioning member insertion portion 54 are formed as far as the opening of the case main body 52.
- the ultrasonic vibrator 2 can simplify the structure of the case main body 52 of the case member 50 and improve the productivity.
- FIG. 11 is a perspective view showing the configuration of the case body
- FIG. 12 is a view showing a state in which the laminated vibrator is accommodated in the case body and is held by the positioning member
- FIG. 13 is an assembled state of the ultrasonic vibrator.
- FIG. 14 is an exploded perspective view showing the assembled state of the ultrasonic transducer of the first modified example
- FIG. 15 is an exploded perspective view showing the assembled state of the ultrasonic transducer of the second modified example
- FIG. 16 is a partial cross-sectional view of the ultrasonic transducer of the second modification.
- a through hole 58 as a positioning member insertion portion is provided at least along the longitudinal direction of the case member 50 at the bottom 55 of the case main body 52 of the case member 50.
- the case main body 52 has a configuration in which only the wiring lead-out portion 53 is formed and the positioning member insertion portion 54 is not formed.
- Each of the four through holes 58 has a pin-shaped positioning member 70 formed of metal, hard resin, hard rubber, wire, fiber, or the like, as shown in FIG. 12, on the outer end face side of the bottom 55 of the case member 50. Is inserted from. As shown in FIG. 13, these four positioning members 70 are provided in the vicinity of the corners of the insulating members 42 and 43, the rectangular piezoelectric body 61, and the electrode plates 62 and 63 that are stacked and accommodated in the case body 52. Hold in contact with one side.
- a pin-shaped positioning member 70 is inserted into each of the four through holes 58 and the case main body 52 is erected to contact the inner wall of the case main body 52.
- the insulating members 42 and 43, the rectangular piezoelectric body 61, and the electrode plates 62 and 63 are stacked and accommodated in other states where they are held in contact with the four positioning members 70.
- the lead-out portions 62 a and 63 a of the electrode plates 62 and 63 are arranged so as to be led out from the wiring lead-out portion 53 formed in the case body 52.
- the lid 51 that is a pressure member is fastened to the case main body 52 by screwing, and the laminated vibrator 41 is moved back and forth by the surface where the male screw portion 51c of the lid 51 and the bottom 55 of the case main body 52 face each other.
- the insulation members 42 and 43 and the laminated vibrator 41 are integrally assembled so as not to move. Thereafter, the four positioning members 70 are removed from the through holes 58 and removed.
- the ultrasonic transducer 2 includes a plurality of non-lead single crystal materials having heat resistance such as lithium niobate (LiNbO 3) having poor workability, which are cut into rectangular shapes.
- the laminated vibrator 41 in which the plurality of rectangular piezoelectric bodies 61 are laminated together with the insulating members 42 and 43 and the electrode plates 62 and 63 can be assembled in the case member 50 with high positioning accuracy.
- the ultrasonic transducer 2 is formed only with the wiring lead-out portion 53 and is not formed with the positioning member insertion portion 54. Therefore, the case member is formed by a plurality of slits. The rigidity reduction of 50 is suppressed and it becomes a highly efficient structure.
- the ultrasonic transducer 2 that is assembled by holding the laminated body by the pin-shaped positioning member 70 may be configured as described below.
- the ultrasonic transducer 2 here includes two lid bodies 51 in which a case member 50 is screwed and fastened to both ends of a cylindrical case main body 52. .
- Each of these two lids 51 is provided with at least four through holes 58 that are inserted so that the pin-shaped positioning members 70 penetrate therethrough along the longitudinal direction of the case member 50.
- these four positioning members 70 are disposed in the vicinity of the corners of the insulating members 42 and 43, the rectangular piezoelectric body 61, and the electrode plates 62 and 63 that are stacked and accommodated in the case body 52, as described above. It is inserted into the through holes 58 of the two lid bodies 51 so as to contact and hold one side.
- a wiring lead-out portion (not shown) that leads the lead-out portions 62 a and 63 a of the electrode plates 62 and 63 to the outside is provided on the lid 51 side that is the rear side of the ultrasonic transducer 2.
- the two lids 51 are screwed in the case main body 52, one of which is a right-hand thread and the other of which is a left-hand thread. Accordingly, the case member 50 does not rotate the two lids 51 by the fixing jig 102, but rotates only the case main body 52 in one direction by the tightening jig 103, so that the lid 51 becomes the case main body 52.
- This is a so-called turnbuckle structure in which both end openings are simultaneously screwed and fastened.
- the case member 50 here has a flat portion 52b for the fastening jig 103 formed therein.
- the lid body 51 does not rotate, so that no torque is generated in the insulating members 42 and 43, the rectangular piezoelectric body 61, and the electrode plates 62 and 63. be able to.
- no torque at the time of fastening is generated in the positioning member 70 that fixes and holds the laminated body including the insulating members 42 and 43, the rectangular piezoelectric body 61, and the electrode plates 62 and 63.
- the laminated vibrator 41 in which the plurality of rectangular piezoelectric bodies 61 are laminated together with the insulating members 42 and 43 and the electrode plates 62 and 63 can be positioned in the case member 50 with high accuracy. Note that, after the two lids 51 and the case main body 52 are fastened, the pin-shaped positioning member 70 is removed from the through hole 58, whereby the ultrasonic vibrator 2 is completed.
- the case member 50 of the ultrasonic transducer 2 here connects the lid 51 and the case main body 52 by an annular member 80 that is extrapolated to the case main body 52. It is configured.
- the case main body 52 of the case member 50 is provided with an outward flange 52c in the vicinity of the opening.
- the annular member 80 of the case member 50 is externally attached to the case main body 52, and is screwed and fastened to the inward flange 81 that contacts the outward flange 52c of the case main body 52 and the male screw portion 51c formed on the lid body 51.
- the lid member 51 of the case member 50 is formed to protrude from the male screw portion 51 c and is housed inside from the opening of the case main body 52, and includes insulating members 42 and 43, a rectangular piezoelectric body 61, and electrode plates 62 and 63. It has the convex part 51e which pressurizes a laminated body.
- the lid 51 is provided with at least four through-holes 58 inserted along the longitudinal direction of the case member 50 so that the pin-shaped positioning member 70 can penetrate therethrough.
- These four positioning members 70 are arranged on one side in the vicinity of the corners of the insulating members 42 and 43, the rectangular piezoelectric body 61, and the electrode plates 62 and 63 that are stacked and accommodated in the case body 52, as described above. It is inserted into the through hole 58 of the lid 51 and the case main body 52 so as to abut and maintain the positioning.
- the annular member 80 is externally inserted into the case main body 52 and screwed to the lid 51 to be fastened.
- the annular member 80 is screwed and fastened to the lid 51 with the outward flange 52c of the case main body 52 in contact with the inward flange 81 of the annular member 80, and the lid 51 and the case main body 52 are connected. Connection is fixed.
- the case member 50 has a structure that can be connected and fixed to the lid body 51 and the case main body 52 without rotating.
- the case main body 52 or the lid body 51 is provided with a wiring lead-out portion (not shown) that leads the lead-out portions 62a and 63a of the electrode plates 62 and 63 to the outside.
- the laminated vibrator 41 in which the plurality of rectangular piezoelectric bodies 61 are laminated together with the insulating members 42 and 43 and the electrode plates 62 and 63 can be positioned with high accuracy in the case member 50.
- the pin-shaped positioning member 70 is removed from the through hole 58, whereby the ultrasonic vibrator 2 is completed.
- the pin-shaped positioning member 70 is removed after the assembly process of the ultrasonic vibrator 2, but a material that does not easily inhibit vibration, such as resin, rubber, wire, or fiber, is used.
- the ultrasonic transducer 2 may be completed by leaving it without being removed, or by cutting only the portion extending from the case main body 52 or the lid 51.
- FIG. 17 is a partial cross-sectional view of a state in which a laminated body including an insulating member, a rectangular piezoelectric body, and an electrode plate is positioned by a positioning member in the case member and pressed by a lid
- FIG. FIG. 19 is a partial cross-sectional view of a state in which a laminated body in which a tolerance of positive tendency has occurred in the piezoelectric body and the electrode plate is positioned by the positioning member in the case member and pressed by the lid body.
- FIG. FIG. 20 is a perspective view showing the configuration of FIG.
- FIG. 21 is a partial cross-sectional view showing that a laminated body in which a tolerance of minus tendency has occurred in the insulating member, the rectangular piezoelectric body, and the electrode plate is positioned in the case member by the positioning member.
- FIG. 22 is a perspective view showing a configuration of the lid according to the second aspect
- FIG. 23 is an insulating member, a rectangular piezoelectric body and an electrode according to the second aspect.
- FIG. 24 is a partial cross-sectional view showing a state in which a laminated body made of plates is positioned by a positioning member in the case member and pressed by the lid
- FIG. 24 is a perspective view showing the configuration of the lid according to the third aspect
- FIG. 26 is a partial sectional view showing a state in which a laminated body including an insulating member, a rectangular piezoelectric body, and an electrode plate is positioned by a positioning member in the case member and pressed by a lid, according to the third embodiment.
- FIG. 27 is an exploded perspective view showing the configuration of the ultrasonic transducer according to the fourth embodiment
- FIG. 28 is related to the fourth embodiment, Insulating member, rectangular piezoelectric body and electrode plate Partial cross-sectional view of a pressurized state by the lid with a stack of positioning by the positioning member within the case member,
- FIG. 29 is a cross-sectional view of the ultrasonic transducer along the line XXIX-XXIX in FIG. 28.
- the V-shaped groove 101 of the positioning member 100 has two insulating members 42 and 43 and a plurality of rectangular piezoelectric elements. It is desirable for the stability of holding that the laminated vibrator 41 including the body 61 and the plurality of electrode plates 62 and 63 is brought into contact over substantially the entire region in the laminating direction to perform positioning.
- the ultrasonic transducer 2 includes two insulating members 42 and 43, a plurality of rectangular piezoelectric bodies 61, and a plurality of electrode plates when the lid 51, which is a pressurizing member, is screwed and fastened to the case body 52.
- the V-shaped groove 101 of the positioning member 100 is in contact with the height direction of 62, 63, as shown in FIG. 17, in particular, in the height direction of the insulating member 42 that is in contact with the lid 51 that is a pressure member. It is desirable that the V-shaped groove 101 of the positioning member 100 is sufficiently in contact with and held at a predetermined length t1.
- the positioning is higher than the overall height of the laminated vibrator 41 and the two insulating members 42 and 43, which are a laminated body in which a plurality of rectangular piezoelectric bodies 61 and a plurality of electrode plates 62 and 63 housed in the case member 50 are laminated.
- the height of the V-shaped groove 101 of the member 100 is made high or equal and the laminated vibrator 41 is held in the whole lamination direction, pressure is applied to the case body 52 by tightening the lid 51 that is a pressure member.
- the lid body 51 interferes with the positioning member 100, and pressure and positioning cannot be performed. Therefore, the height of the positioning member 100 needs to be designed to be lower than the height of the laminated vibrator 41.
- the two insulating members 42 and 43 and the laminated vibrator 41 are designed so that the height (thickness) dimensions of the plurality of rectangular piezoelectric bodies 61 and the plurality of electrode plates 62 and 63 are set to predetermined specified values, Have a manufacturing tolerance in the height dimension.
- the insulating members 42 and 43 made of alumina for example, have a thickness of 0.5 mm
- the rectangular piezoelectric body 61 made of lithium niobate single crystal (LiNbO 3) has an electrode made of 0.5 mm and copper.
- the tolerance in the height (thickness) direction due to processing may be about 0.05 mm at the maximum.
- the insulating member 42 is a laminated body in which two insulating members 42 and 43, eight rectangular piezoelectric bodies 61 and nine electrode plates 62 and 63 are laminated, the insulating member 42 in contact with the lid 51 is the case body 52.
- the installation height of the insulating member 42 having a thickness of 0.5 mm may vary within a range of ⁇ 0.9 mm with respect to the design value. There will be.
- the two insulating members 42 and 43, the plurality of rectangular piezoelectric bodies 61, or the plurality of electrode plates 62 and 63 are each made of one member, for example, alumina, lithium niobate single crystal (LiNbO3) or copper. It is processed by batch processing that cuts out multiple wafers and plates.
- the total number of the two insulating members 42 and 43, the plurality of rectangular piezoelectric bodies 61, or the plurality of electrode plates 62 and 63 may have a positive tendency or a negative tendency tolerance.
- the two insulating members 42 and 43, the plurality of rectangular piezoelectric bodies 61, or the plurality of electrode plates 62 and 63 each have a positive tendency tolerance.
- the predetermined length t2 at which the V-shaped groove 101 of the positioning member 100 contacts the insulating member 42 that contacts the lid 51, which is a pressurizing member is shorter than the predetermined length t1 (see FIG. 17). (T2 ⁇ t1).
- the stress concentration due to the rotational force from the lid 51 to the insulating member 42 causes the positioning member 100 and the insulating member 42 to be deformed or chipped.
- a part of the laminated vibrator 41 rotates in the fastening direction. May be assembled in a state having
- the ultrasonic transducer 2 here includes two insulating members accommodated in the case main body 52 in contact with the insulating member 42 by the lid body 51 as a pressure member.
- a pressurizing part that pressurizes 42 and 43 and the laminated vibrator 41 in the laminating direction
- a disk-shaped rotation buffer plate 51d that is rotatable about the central axis X with respect to the male screw part 51c is provided.
- the lid 51 is formed with a concave groove 51e having a circular cross section from the end face side of the male screw 51c, and a rotation buffer plate 51d is rotatably engaged with the groove 51e.
- the rotation buffer plate 51d that has come into contact with the insulating member 42 can buffer the generation of rotational torque with respect to the insulating member 42 by sliding the contact surface of the lid 51 with the recess 51e.
- a dimensional variation that is, a positive tendency tolerance occurs in the manufacturing of the plurality of rectangular piezoelectric bodies 61 or the plurality of electrode plates 62 and 63 constituting the two insulating members 42 and 43 and the laminated vibrator 41, and the positioning member 100 Even if the holding area for holding the insulating member 42 is decreased by contacting the V-shaped groove 101 with a short predetermined length t2, the positioning member 100 and the insulating member 42 are deformed, chipped, and the position of the insulating member 42. Misalignment is less likely to occur.
- the laminated vibrator 41 can be pressure-fastened to the correct position of the case member 50 without causing damage or chipping.
- the rotation buffer plate 51d is not required to be deformed with respect to the strength required to pressurize the laminated vibrator 41 accommodated in the case body 52, and may be a metal material such as titanium, duralumin, stainless steel, or alumina. It is desirable to form from ceramic materials such as zirconia.
- the front and back surfaces of the rotation buffer plate 51d be in a mirror surface or a state close to a mirror surface with a surface roughness Ra of 0.05 or less in order to reduce friction between the lid 51 and the recess 51e and the insulating member 42.
- grease or the like may be applied to each interface.
- the ultrasonic transducer 2 has the lid 51 even if the holding area of the insulating member 42 is decreased by the positioning member 100 due to the dimensional variation of the laminated transducer 41, here, the tolerance of the positive tendency. Since the rotational force when screwing and fastening to the case main body 52 is difficult to be transmitted to the insulating member 42, deformation of the positioning member 100, displacement of the insulating member 42, chipping, etc. hardly occur, and the laminated vibrator 41 is The two insulating members 42 and 43 and the laminated vibrator 41 can be assembled at predetermined positions of the case member 50 without causing a rotational shift in the fastening direction of the lid 51.
- the height of the positioning member 100 is 2 by the tolerance integration.
- the laminated body composed of the two insulating members 42 and 43 and the laminated vibrator 41 has a lower height dimension, and as shown in FIG. 21, the positioning member 100 interferes with the lid 51 which is a pressure member. As a result, the laminate housed in the case main body 52 cannot be pressurized, and the assembly of the ultrasonic transducer 2 becomes impossible.
- the two insulating members 42, 43, the plurality of rectangular piezoelectric bodies 61, or the plurality of electrode plates 62, 63 each have a negative tendency tolerance, so that the positioning member 100 is integrated by the tolerance integration of the laminated vibrator 41.
- One end surface exceeds the thickness of the insulating member 42, and the electrode plate 62 that contacts the insulating member 42 has a predetermined length t3 longer than the predetermined length t1 (see FIG. 17). .
- the two insulating members 42 and 43 and the laminated vibrator 41 cannot receive pressure from the lid 51 and, as a result, are not fixed within the case member 50, and the two insulating members 42 and 43, a plurality of The rectangular piezoelectric body 61 or the plurality of electrode plates 62 and 63 are easily displaced.
- the ultrasonic transducer 2 here includes two insulating members that are accommodated in the case main body 52 by contacting the insulating member 42 with the lid 51 that is a pressurizing member.
- a pressurizing part that pressurizes 42, 43 and the laminated vibrator 41 in the laminating direction, a cylindrical convex part 51f protruding from the end face of the male screw part 51c is provided.
- the convex portion 51f has a columnar shape having a diameter d2 smaller than d1 from one side of the insulating member 42 in contact with the convex portion 51f.
- the convex portion 51f contacts only the insulating member 42 to add the two insulating members 42 and 43 and the laminated vibrator 41. Therefore, the lid 51 does not interfere with the positioning member 100.
- the positioning member 100 has a dimension in the height direction (stacking direction) that is generated in the plurality of rectangular piezoelectric bodies 61 and the plurality of electrode plates 62 and 63 constituting the two insulating members 42 and 43 and the stacked vibrator 41. In consideration of the tendency tolerance, it is desirable to make it equal to or larger than the maximum dimension in the height direction of the two insulating members 42 and 43 and the entire laminated vibrator 41.
- the ultrasonic vibrator 2 has a configuration that can cope with a tolerance of a minus tendency and a tolerance of a plus tendency as a dimensional variation of the two insulating members 42 and 43 and the laminated vibrator 41. Even if the dimension in the height direction of the laminated body including the insulating members 42 and 43 and the laminated vibrator 41 varies, the insulating members 42 and 43 and the laminated vibrator 41 always come into contact with the V-shaped groove 101 of the positioning member 100. Therefore, the two insulating members 42 and 43 and the laminated vibrator 41 can be reliably held by the positioning member 100 with a constant holding force.
- the holding area of the insulating member 42 by the positioning member 100 is not changed, and the positioning member 100 has the two insulating members 42 and 43 and the laminated vibrator 41 constant over the entire lamination direction. Therefore, a large pressure is not locally applied to the positioning member 100 and the insulating member 42, a concentrated load is not applied, and deformation of the positioning member 100, displacement of the insulating member 42, chipping, and the like are unlikely to occur.
- the two insulating members 42 and 43 and the laminated vibrator 41 can be assembled to a predetermined position of the case member 50 without causing the laminated vibrator 41 to rotate in the fastening direction of the lid 51.
- the ultrasonic vibrator 2 is configured to be able to cope with dimensional fluctuations in the height direction of the two insulating members 42 and 43 and the laminated vibrator 41 due to tolerances of a positive tendency and a negative tendency, as shown in FIGS.
- a central axis X that combines the first embodiment and the second embodiment to press the laminated vibrator 41 accommodated in the case body 52 in contact with the insulating member 42 in the lamination direction. It is good also as the rotation buffering convex part 51g rotatable freely.
- the lid 51 also has a concave groove 51h having a circular cross section from the end face side of the male screw 51c, and a rotation buffering convex 51g is rotatably engaged in the groove 51h.
- the ultrasonic transducer 2 has the same effects as the first embodiment and the second embodiment, and deformation of the positioning member 100, displacement of the insulating member 42, chipping, etc. It becomes difficult to occur, and the laminated vibrator 41 can be assembled at a predetermined position of the case member 50 without causing the laminated vibrator 41 to be rotated in the fastening direction.
- the ultrasonic transducer 2 here includes two anti-rotation protrusions that are integrally formed, for example, in a direction away from the insulating member 42 that is in contact with the lid 51 that is a pressure member.
- the portion 42 a is extended, and two rotation prevention groove portions 59 in which these two rotation prevention protrusions 42 a are engaged are formed in the opening of the case body 52.
- the two anti-rotation protrusions 42 a are preferably formed in an arc shape so that the protrusion amount is set in accordance with the outer diameter of the case main body 52, and the protrusion end faces coincide with the outer peripheral surface of the case main body 52. .
- case main body 52 has the insulating member 42 that is high along the anti-rotation groove 59 in accordance with the dimensional variation in the height direction of the two insulating members 42 and 43 and the laminated vibrator 41 due to the plus and minus tolerances.
- the length of the rotation preventing groove 59 having a margin so that it can be freely moved in the vertical direction is set.
- the rotation preventing projection 42a and the rotation preventing groove 59 are set so that the dimensions in the width direction are substantially the same.
- each of the two anti-rotation protrusions 42 a of the insulating member 42 is fitted into the two anti-rotation grooves 59 of the case body 52.
- the rotation of the insulating member 42 around the central axis of the case main body 52 is restricted.
- the insulating member 42 abuts against the wall surface of the rotation prevention groove 59 even if the lid 51 comes into contact and is given a rotational force. Without moving around the central axis of the case main body 52, it becomes movable only in the height direction (pressure direction).
- the laminated vibrator 41 can be assembled at a predetermined position of the case member 50 without causing a deviation.
- the part 42a is desirably provided at at least two locations at equal intervals in the circumferential direction.
- the rotation preventing groove 59 provided in the case main body 52 may also be used as the wiring lead-out portion 53 or the positioning member insertion portion 54.
- the rotational force when the lid 51 is screwed to the case main body 52 and fastened to the positioning member 100 is not applied via the insulating member 42.
- the first to third aspects have the same operational effects as the positioning member 100, deformation of the insulating member 42, and misalignment of the insulating member 42. It is difficult for the laminated vibrator 41 to rotate in the fastening direction.
- the laminated body including the two insulating members 42 and 43 and the laminated vibrator 41 can be assembled at a predetermined position of the case member 50 without raising.
- the described requirements can be deleted if the stated problem can be solved and the stated effect can be obtained.
- the configuration can be extracted as an invention.
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Abstract
Description
なお、以下の説明において、各実施の形態に基づく図面は、模式的なものであり、各部分の厚みと幅との関係、夫々の部分の厚みの比率などは現実のものとは異なることに留意すべきであり、図面の相互間においても互いの寸法の関係や比率が異なる部分が含まれている場合がある。
先ず、本発明の第1の実施の形態について、図面に基づいて、以下に説明する。
図1は、超音波医療装置の全体構成示す断面図、図2は、振動子ユニットの全体の概略構成を示す図、図3は、振動子ユニットの構成を示す斜視図、図4は、絶縁部材、矩形圧電体および電極板からなる積層体の構成を示す分解斜視図、図5は、振動子ユニットの構成を示す分解斜視図、図6は、超音波振動子の組み立て状態を示す分解斜視図、図7は、超音波振動子の組み立て状態を示す断面図、図8は、変形例のケース本体の構成を示す斜視図、図9は、図8とは別形態の変形例のケース本体の構成を示す斜視図、図10は、図8および図9の変形例の超音波振動子の組み立て状態を示す断面図である。
図1に示す、超音波医療装置1は、主に超音波振動を発生させる超音波デバイスとしての超音波振動子2を有する振動子ユニット3と、その超音波振動を用いて患部の治療を行うハンドルユニット4とが設けられている。
ここで、振動子ユニット3について説明する。
振動子ユニット3は、図2に示すように、超音波振動子2と、この超音波振動子2で発生した超音波振動を伝達する棒状の振動伝達部材であるプローブ6とを一体的に組み付けたものである。
ここで、本発明の積層型超音波振動デバイスとしての超音波振動子2について以下に説明する。
振動子ユニット3の超音波振動子2は、図3に示すように、ホーン32後方の基端円柱部38に連設されたケース部材50内に、ここでは矩形状(四角柱形状)に積層された積層振動子41が内蔵されている。
ここで、超音波振動子2の組立方法について以下に説明する。
先ず、図6に示すように、ケース本体52の内部には、絶縁部材42,43、矩形圧電体61、各電極板62,63が積層されて収容される。このとき、矩形圧電体61および各電極板62,63は、ケース本体52の内壁(側壁)に接触しない位置に収容される。つまり、積層振動子41に接触するのは絶縁部材42,43のみでありケース本体52の側壁には非接触の状態が維持され、絶縁部材42,43のみがケース本体52の底部55と蓋体51に接触する状態となる。そして、絶縁部材42,43が接触する面は積層方向(積層振動子41の振動方向)の面のみである。また、各電極板62,63の導出部62a,63aは、ケース本体52に形成された配線導出部53から導出するように配置される。
ケース部材50のケース本体52の外周部に形成される配線導出部53および位置決め部材挿入部54は、図8または図9に示すように、同一のスリット56,57とした構成としても良い。
次に、本発明の第2の実施の形態について、図面に基づいて以下に説明する。なお、第1の実施の形態にて記載した各構成要素に関し、同一構成のものについては同じ符号を用いて、それらの詳細な説明を省略する。
図11は、ケース本体の構成を示す斜視図、図12は、ケース本体内に積層振動子が収容され位置決め部材によって保持された状態を示す図、図13は、超音波振動子の組み立て状態を示す断面図、図14は、第1の変形例の超音波振動子の組み立て状態を示す分解斜視図、図15は、第2の変形例の超音波振動子の組み立て状態を示す分解斜視図、図16は、第2の変形例の超音波振動子の部分断面図である。
なお、本実施の形態のように、ピン状の位置決め部材70により積層体を保持して組み立てる超音波振動子2は、以下に記載の構成としてもよい。
ここでの超音波振動子2は、図14に示すように、ケース部材50が円筒状のケース本体52の両端に螺着されて締結される2つの蓋体51を有して構成されている。これら2つの蓋体51のそれぞれには、ピン状の位置決め部材70が貫通するように挿入される貫通孔58がケース部材50の長手方向に沿って少なくとも4つ設けられている。
ここでの超音波振動子2のケース部材50は、図15および図16に示すように、蓋体51とケース本体52とを、ケース本体52に外挿させた円環部材80によって接続するように構成されている。
次に、本発明の第3の実施の形態について、図面に基づいて以下に説明する。なお、本実施の形態の超音波振動子2の構成は、第1の実施の形態の変形例であり、第1の実施の形態にて記載した各構成要素に関し、同一構成のものについては同じ符号を用いて、それらの詳細な説明を省略する。
ここでは、第1の実施の形態に記載した超音波振動子2の構成に関して、2つの絶縁部材42,43と積層振動子41を構成する複数の矩形圧電体61および複数の電極板62,63の製造時の厚さ方向の公差によって生じる問題を解決する構成について以下に説明する。
そこで、ここでの超音波振動子2は、図19および図20に示すように、加圧部材である蓋体51が絶縁部材42に接触してケース本体52内に収容された2つの絶縁部材42,43および積層振動子41を積層方向に加圧する加圧部として、雄ネジ部51cに対して中心軸X回りに回動自在な円板状の回転緩衝板51dが設けられている。
そこで、ここでの超音波振動子2は、図22および図23に示すように、加圧部材である蓋体51が絶縁部材42に接触してケース本体52内に収容された2つの絶縁部材42,43および積層振動子41を積層方向に加圧する加圧部として、雄ネジ部51cの端面から突出する円柱状の凸部51fを有している。
なお、超音波振動子2は、プラス傾向およびマイナス傾向の公差による2つの絶縁部材42,43および積層振動子41の高さ方向の寸法変動に対応できるような構成として、図24および図25に示すように、上記第1の形態および上記第2の形態を組み合わせた構成として、絶縁部材42に接触してケース本体52内に収容された積層振動子41を積層方向に加圧する、中心軸X回りに回動自在な回転緩衝凸部51gとしてもよい。
ここでの超音波振動子2は、図26および図27に示すように、加圧部材である蓋体51に接触する絶縁部材42から、例えば離反する方向に一体形成された2つの回転防止突起部42aが延設され、これら2つの回転防止突起部42aが係合する2つ回転防止溝部59をケース本体52の開口部に形成されている。
Claims (9)
- 複数の圧電体と複数の電極板とが積層された、外形が多角柱形状をなす積層振動子と、
前記積層振動子の両端に配設される絶縁部材と、
前記圧電振動子および前記絶縁部材を収容するケース本体と、
前記ケース本体の開口部に螺着して締結され、前記積層振動子および前記絶縁部材を前記ケース本体内で加圧して固定する加圧部材と、
前記ケース本体内において、前記積層振動子と前記絶縁部材とを前記多角柱形状に保持すると共に、前記積層振動子を前記ケース本体の内壁に非接触、且つ、前記絶縁部材の一端が前記加圧部材に接触する位置に位置決めする位置決め部材を挿入する複数の位置決め部材挿入部と、
を具備することを特徴とする超音波振動デバイス。 - 前記複数の圧電体は、圧電単結晶から形成されていることを特徴とする請求項1に記載の超音波振動デバイス。
- 前記複数の位置決め部材挿入部は、前記ケース本体または前記加圧部材に形成された複数の開口であることを特徴とする請求項1または請求項2に記載の超音波振動デバイス。
- 前記複数の開口は、前記ケース本体の長手方向に沿って形成されたスリットであることを特徴とする請求項3に記載の超音波振動デバイス。
- 前記複数の電極板からは、外部からの駆動電力が供給される配線に接続される複数の導出部が延設され、
前記複数のスリットは、前記複数の導出部を前記ケース本体の外部へ導出させる配線導出部を兼ねていることを特徴とする請求項4に記載の超音波振動デバイス。 - 前記ケース本体は、筒体であって、前記ケース本体の両端開口部のそれぞれに前記加圧部材が螺着して締結されるケース部材を備え、
前記ケース本体への一方の前記加圧部材の螺着方向が右ネジで、他方の前記加圧部材の螺着方向が左ネジに設定されていることを特徴とする請求項1から請求項5のいずれか1項に記載の超音波振動デバイス。 - 前記ケース本体は、外周部に外向フランジが形成された有底筒体であって、前記ケース本体に外挿されて前記外向フランジと当接する内向フランジを備えた円環部材が前記加圧部材に螺着して締結することで、前記加圧部材が前記ケース本体の開口部に接続固定されることを特徴とする請求項1から請求項5のいずれか1項に記載の超音波振動デバイス。
- 請求項1から請求項5のいずれか1項に記載の超音波振動デバイスの製造方法であって、
前記絶縁部材が両端に配設された前記積層振動子を前記ケース本体の内壁に非接触の位置に収容し、
前記ケース本体の前記複数の位置決め部材挿入部に、先端にV字溝が形成された複数の位置決め部材を挿入して、前記絶縁部材および前記積層振動子からなる積層体の対角する角部に前記位置決め部材の前記V字溝を当て付けて、前記積層体を前記ケース本体内で前記多角柱形状に保持した状態で位置決めし、
前記加圧部材をケース本体に螺着して締結して、前記加圧部材と前記ケース本体の底部によって前記積層体を加圧して固定し、
前記複数の位置決め部材を位置決め部材挿入部から退避されて取り外すことを特徴とする超音波振動デバイスの製造方法。 - 請求項1から請求項7のいずれか1項に記載の超音波振動デバイスと、
前記超音波振動デバイスで発生した超音波振動が伝達され生体組織を処置するプローブ先端部と、
を具備することを特徴とする超音波医療装置。
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