WO2020174532A1 - Outil de traitement par ultrasons - Google Patents

Outil de traitement par ultrasons Download PDF

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Publication number
WO2020174532A1
WO2020174532A1 PCT/JP2019/007064 JP2019007064W WO2020174532A1 WO 2020174532 A1 WO2020174532 A1 WO 2020174532A1 JP 2019007064 W JP2019007064 W JP 2019007064W WO 2020174532 A1 WO2020174532 A1 WO 2020174532A1
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WO
WIPO (PCT)
Prior art keywords
piezoelectric element
peripheral surface
ultrasonic
liquid
cavity
Prior art date
Application number
PCT/JP2019/007064
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English (en)
Japanese (ja)
Inventor
伊藤　寛
晋一朗 梅村
晋 吉澤
Original Assignee
オリンパス株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by オリンパス株式会社 filed Critical オリンパス株式会社
Priority to PCT/JP2019/007064 priority Critical patent/WO2020174532A1/fr
Publication of WO2020174532A1 publication Critical patent/WO2020174532A1/fr

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/22—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N7/00—Ultrasound therapy

Definitions

  • the present invention relates to an ultrasonic treatment tool.
  • transurethral lithotripsy which inserts the tip of a treatment tool into the kidney and urinary tract to crush stones, has become the mainstream.
  • a treatment tool used for transurethral lithotripsy is required to have high lithotripsy performance, and it is also required that the tip has a small diameter and can be inserted through an endoscope channel. ..
  • the mainstream method is to crush stones by inserting an optical fiber into the endoscope channel and guiding a laser into the optical fiber to irradiate the stone. Also, it is possible to crush stones by irradiating the stones with powerful ultrasonic waves, but there is no device yet that can generate ultrasonic waves that are powerful enough to crush stones with a size that can be inserted into the endoscope channel. ..
  • Patent Document 1 describes an ultrasonic treatment instrument having a thin tip and capable of high output.
  • the ultrasonic treatment tool of Patent Document 1 has an ultrasonic transducer formed of a cylindrical piezoelectric element at the tip of the insertion portion, and when the ultrasonic transducer is filled with cooling water, Ultrasound is emitted toward the affected area.
  • the ultrasonic transducer formed of a cylindrical piezoelectric element has a small diameter and is sized to be inserted into a body cavity.
  • Ultrasonic treatment tools used for transurethral lithotripsy require further reduction in diameter and higher output.
  • the cylindrical piezoelectric element is provided inside the balloon in a state of being filled with cooling water, and it is difficult to further reduce the diameter.
  • the balloon and the cooling water become a load for the vibration of the piezoelectric element, and it is difficult to realize a high output.
  • an object of the present invention is to provide an ultrasonic treatment tool having a small diameter and high output.
  • the ultrasonic treatment instrument has a cylindrical shape having a cavity filled with a liquid that propagates ultrasonic waves, and the polarization direction is the thickness direction connecting the inner peripheral surface and the outer peripheral surface.
  • a piezoelectric element and an outer cylinder that holds the piezoelectric element by providing a gas layer on the outer peripheral surface side of the piezoelectric element are provided.
  • the resonance frequency of the respiratory vibration of the piezoelectric element is equal to the resonance frequency of the liquid in the cavity in the radial direction. Good.
  • the ultrasonic treatment tool according to the second aspect even if the ratio of the length in the longitudinal direction of the piezoelectric element to the inner diameter of the piezoelectric element is 3.5 or more. Good.
  • the ultrasonic wave irradiation direction of the piezoelectric element is the distal end side, and the direction opposite to the distal end side in the longitudinal direction is the proximal end side.
  • a second gas layer is formed in the cavity of the piezoelectric element, which serves as a reflection surface for reflecting ultrasonic waves toward a base end side of a division position where the length in the longitudinal direction is divided into two. May be done.
  • the division position may be a position obtained by dividing the length in the longitudinal direction into two equal parts.
  • the ultrasonic treatment instrument of the present invention it is possible to provide an ultrasonic treatment instrument having a small diameter and high output.
  • FIG. 6 is a cross-sectional view of an ultrasonic wave oscillating portion whose internal cavity is filled with a liquid.
  • FIG. 3 is a cross-sectional view of an ultrasonic wave oscillating unit in which a part of the cavity is filled with a liquid. 3 is an XY cross section of a cylindrical liquid filled in the same cavity.
  • FIG. 3 is a schematic diagram of the piezoelectric element of Example 1.
  • FIG. 5 is a schematic diagram of a piezoelectric element of Example 2.
  • FIG. 7 is a schematic diagram of a piezoelectric element of Example 3.
  • FIG. It is a graph which compared the sound pressure distribution in the central axis of a piezoelectric element. It is the graph which normalized the maximum value of sound pressure as 1.
  • FIG. 1 is a diagram showing an overall configuration of a calculus crushing system 300.
  • the calculus breaking system 300 includes an endoscope 200 that is inserted into the urethra U and an ultrasonic treatment instrument 100 that is inserted into a channel of the endoscope 200.
  • the endoscope 200 is appropriately selected from known flexible ureteroscopes including a long endoscope insertion portion 202 having a treatment instrument channel 201 through which a treatment instrument can be inserted.
  • the endoscope 200 has an operation unit 204 at the base end.
  • the operation section 204 is provided with a treatment instrument insertion hole 205, and the ultrasonic treatment instrument 100 is inserted into the treatment instrument channel 201 through the treatment instrument insertion hole 205.
  • FIG. 2 is a perspective view of the tip of the endoscope insertion portion 202 facing the calculus C to be crushed.
  • the endoscope 200 has an illumination 206 and an imaging unit 207 at the tip of the endoscope insertion unit 202.
  • the tip of the ultrasonic treatment instrument 100 inserted into the treatment instrument channel 201 projects from the treatment instrument channel opening 203 at the tip of the endoscope insertion portion 202.
  • the endoscope 200 sends water into the body by discharging the water conveyed via the treatment instrument channel 201 from the treatment instrument channel opening 203.
  • the water discharged from the treatment tool channel opening 203 is perfused through a separately provided drainage channel or the like.
  • the water supply channel and the water supply channel opening are provided in the endoscope 200, and the water conveyed through the water supply channel is discharged into the body by being discharged from the water supply channel opening at the tip of the endoscope 200. Also good.
  • the water discharged from the water supply channel opening is perfused through the treatment tool channel 201, a separately provided drainage channel, and the like.
  • the endoscope 200 is connected to an endoscope system 210 as shown in FIG.
  • the endoscope system 210 includes a light source that provides light to the illumination 206 of the endoscope 200, an image processing circuit that performs image processing on an image captured by the image capturing unit 207, and displays the image on a monitor.
  • the ultrasonic treatment instrument 100 includes an ultrasonic wave oscillating unit 1, an inserting unit 2, and a driving unit 3.
  • the ultrasonic treatment tool 100 is a treatment tool that performs treatment by generating ultrasonic waves from the ultrasonic wave oscillating unit 1 to the affected area.
  • FIG. 3 is a cross-sectional view of the ultrasonic wave oscillating unit 1 of the ultrasonic treatment instrument 100.
  • the ultrasonic wave oscillating unit 1 is a tubular member provided at the tip of the insertion unit 2 and generates ultrasonic waves for the calculus C.
  • the ultrasonic oscillator 1 has a piezoelectric element 11 and an outer cylinder 12.
  • the longitudinal direction of the ultrasonic oscillator 1 is also referred to as the Z-axis direction
  • the plane perpendicular to the Z-axis direction is also referred to as the XY plane.
  • the irradiation direction of ultrasonic waves (one side in the Z-axis direction) is referred to as “tip side”, and the opposite side (the other side in the Z-axis direction) is referred to as “proximal side”.
  • the piezoelectric element 11 is a cylindrical element having a cavity H inside, and is a passive element that utilizes the piezoelectric effect of converting voltage into force.
  • the piezoelectric element 11 is made of, for example, ceramics.
  • the piezoelectric element 11 has a polarization direction in the thickness direction connecting the inner peripheral surface 11i and the outer peripheral surface 11o, and utilizes radial vibration (breathing vibration).
  • the outer cylinder 12 is a cylindrical member provided on the outer peripheral side of the piezoelectric element 11, and has a cylindrical cylinder portion 12s and a tip portion 12d provided at the tip of the cylinder portion 12s.
  • the outer cylinder 12 has only a front end side opening 121 formed at the front end portion 12d and a base end side opening 122 formed at the base end of the cylindrical portion 12s.
  • the tip portion 12d is a disk-shaped member provided at the tip of the cylindrical portion 12s, and has a tip-side opening 121 at the center.
  • the tip portion 12d has a plate thickness direction that matches the longitudinal direction of the cylindrical portion 12s.
  • the peripheral edge portion 121e on the proximal end side of the distal end side opening 121 is tightly sealed with the distal end portion 11d of the piezoelectric element 11 and the adhesive portion 41.
  • the tip-side opening 121 communicates with the cavity H surrounded by the inner peripheral surface 11i of the piezoelectric element 11.
  • the diameter dimension of the front end side opening 121 is substantially equal to the diameter dimension D1 of the inner peripheral surface 11i of the piezoelectric element 11.
  • the diameter dimension D3 of the inner peripheral surface 12i of the outer cylinder 12 is slightly larger than the diameter dimension D2 of the outer peripheral surface 11o of the piezoelectric element 11. Further, the central axis of the outer cylinder 12 in the longitudinal direction coincides with the central axis C of the piezoelectric element 11 in the longitudinal direction. Therefore, between the outer peripheral surface 11o of the piezoelectric element 11 and the inner peripheral surface 12i of the outer cylinder 12, a "gas layer A" in which gas can exist is formed over the entire circumference of the outer peripheral surface 11o of the piezoelectric element 11. ..
  • the insertion portion 2 is a coaxial cable attached to the proximal end side of the ultrasonic wave oscillating portion 1, and a first conductive wire 21 and a second conductive wire 22 for transmitting electric power to the piezoelectric element 11 are inserted therein. ..
  • the first conductive wire 21 is one of the positive electrode and the negative electrode
  • the second conductive wire 22 is the other of the positive electrode and the negative electrode.
  • the tip of the first conductive wire 21 is attached to the inner peripheral surface 11i of the piezoelectric element 11 by the conductive adhesive portion 42. Further, the conductive adhesive portion 42 seals the base end side opening 112 of the piezoelectric element 11. On the other hand, the base end of the first conductive wire 21 is attached to the drive unit 3.
  • the tip of the second conductive wire 22 is attached to the outer peripheral surface 11o of the piezoelectric element 11 and the conductive adhesive portion 43.
  • the base end of the second conductive wire 22 is attached to the drive unit 3.
  • the polarization direction of the piezoelectric element 11 is the thickness direction (radial direction) connecting the inner peripheral surface 11i and the outer peripheral surface 11o.
  • a voltage is applied to the piezoelectric element 11 from the first conductive wire 21 and the second conductive wire 22.
  • the waveform of the applied voltage is a sine wave having a frequency at which radial vibration (breathing vibration) occurs, whereby the piezoelectric element 11 vibrates in the radial direction (breathing vibration) due to the piezoelectric effect.
  • the driving unit 3 is a device that applies a voltage to the piezoelectric element 11 of the ultrasonic oscillator 1 via the first conductive wire 21 and the second conductive wire 22 that are inserted through the insertion unit 2. is there.
  • the drive unit 3 has a switch or the like (not shown), and an operator can operate the switch and control the application of voltage to the piezoelectric element 11.
  • the proximal end opening 122 of the outer cylinder 12 is sealed by the adhesive portion 44 without any gap in a state where only the insertion portion 2 is passed.
  • the gas layer A is sealed on the front end side by the adhesive portion 41 without any gap.
  • the base end side opening 112 of the piezoelectric element 11 is also sealed by the conductive adhesive portion 42 without a gap. That is, the gas layer A is hermetically sealed and is kept watertight even when the ultrasonic wave oscillating unit 1 is immersed in a liquid.
  • FIG. 4 is a cross-sectional view of the ultrasonic wave oscillating unit 1 in which the cavity H is filled with the liquid L.
  • the tip-side opening 121 communicates with the cavity H of the piezoelectric element 11, and when the liquid L such as physiological saline flows from the tip-side opening 121, the liquid L flows into the cavity H. Since the gas layer A is kept watertight, the liquid L does not flow into the gas layer A.
  • the gas layer A formed over the entire circumference of the outer peripheral surface 11o of the piezoelectric element 11 is filled with gas, so that the gas layer A functions as a region that does not transmit ultrasonic waves. This is because the gas filled in the gas layer A hardly transmits ultrasonic waves as compared with the liquid L. Even if the radial dimension of the gas layer A is small, the gas layer A functions as a region that does not transmit ultrasonic waves. It is sufficient that the outer peripheral surface 11o of the piezoelectric element 11 and the inner peripheral surface 12i of the outer cylinder 12 do not come into contact with each other during breathing vibration. The smaller the radial dimension of the gas layer A is, the more suitable it is because the ultrasonic oscillating section 1 has a smaller diameter.
  • FIG. 5 is a cross-sectional view of the ultrasonic wave oscillating unit 1 in which the cavity H is partially filled with the liquid L.
  • a predetermined amount of gas remains without being discharged when the liquid flows in, and the second gas layer A2 is formed inside the cavity H.
  • the second gas layer A2 is arranged on the base end side by the pressure of the liquid L.
  • the boundary between the liquid L and the second gas layer A2 functions as a reflection surface R that reflects ultrasonic waves.
  • the reflecting surface R reflects ultrasonic waves toward the tip side, and the generated ultrasonic waves are emitted toward the calculus C to be crushed.
  • FIG. 6 is an XY cross section of the cylindrical liquid L filling the entire cavity H as shown in FIG.
  • the equation of motion of the resonant vibration in the radial direction of the liquid L is expressed by Equation 1.
  • Expression 1 is expanded into Expression 2, and Expression 3 is derived.
  • J 1 is a first-order Bessel function of the first kind (see FIG. 7), and u 0 is an arbitrary constant determined by boundary conditions.
  • the minimum resonance diameter 2r 0 of the distance (resonance diameter) at which the displacement u is maximized is calculated as in Expressions 4 and 5.
  • FIG. 8 is an XY cross section of the piezoelectric element 11.
  • the piezoelectric element 11 when the distance a from the central axis C, the radial displacement u, the elastic constant E of the piezoelectric element 11, the sound velocity ks of the piezoelectric element 11, the Poisson's ratio ⁇ , the density ⁇ , and the time t are given,
  • the equation of motion of the resonance vibration in the radial direction is expressed by Equation 6.
  • the piezoelectric element 11 is modeled as a cylinder having a very thin thickness.
  • Equation 6 is derived from Equation 6.
  • Cs is represented by Expression 8.
  • Equation 10 the ratio between the resonance diameter 2r 0 of the liquid L and the resonance diameter 2a of the piezoelectric element 11 is expressed by Equation 10.
  • the piezoelectric element 11 formed thinly of ceramics and the cylindrical liquid L having an outer diameter equal to the inner diameter of the piezoelectric element 11 resonate. That is, the resonance frequency of the respiratory vibration of the piezoelectric element 11 is equal to the resonance frequency of the liquid L in the cavity H in the radial direction.
  • the resonance frequency of the respiratory vibration of the piezoelectric element 11 is equivalent to the resonance frequency of the liquid L in the cavity H in the radial direction means that they both substantially coincide with each other to the extent that resonance occurs.
  • the lengths of the piezoelectric element 11 and the cylindrical liquid L in the longitudinal direction be sufficiently larger than the diameter of the piezoelectric element 11.
  • FIG. 9 is a sectional view of an ideal baffled piezoelectric element 11A.
  • the outer cylinder 12 is not provided on the outer circumference of the piezoelectric element 11A.
  • the piezoelectric element 11A is provided with an ideal baffle that does not become a load on the piezoelectric element 11A, and the liquid L does not flow into the outer periphery of the piezoelectric element 11A without the outer cylinder 12, and the outer periphery of the piezoelectric element 11A is A gas layer A is formed on the surface side.
  • FIG. 10 is a sectional view of the piezoelectric element 11 with the outer cylinder 12.
  • the piezoelectric element 11 is held by the outer cylinder 12, and the gas layer A is formed between the outer peripheral surface 11o of the piezoelectric element 11 and the inner peripheral surface 12i of the outer cylinder 12 over the entire outer peripheral surface 11o of the piezoelectric element 11. It is formed.
  • the thickness of the piezoelectric element was set to 1/5 of the inner diameter of the piezoelectric element.
  • FIG. 11 is a simulation result regarding the relationship between the aspect ratio of the piezoelectric element and the acoustic output.
  • the piezoelectric element 11 with the outer cylinder 12 is smaller than the piezoelectric element 11A with a baffle. Also has a higher sound output.
  • the piezoelectric element 11 with the outer cylinder 12 has a substantially constant value when the ratio of the length in the longitudinal direction of the piezoelectric element 11 to the length of the average diameter of the piezoelectric element 11 is 3.5 or more.
  • the operator causes the ultrasonic wave oscillating section 1 of the ultrasonic treatment instrument 100 to protrude from the treatment instrument channel opening 203 at the tip of the endoscope insertion section 202, as shown in FIG.
  • the surgeon further brings the tip-side opening 121 of the ultrasonic wave oscillating unit 1 closer to the calculus C to be crushed, while checking the image displayed on the monitor.
  • the physiological saline sent from the treatment instrument channel opening 203 flows in from the distal end side opening 121.
  • the cavity H surrounded by the inner peripheral surface 11i of the piezoelectric element 11 is filled with the liquid L.
  • the outer peripheral surface 11o of the piezoelectric element 11 is still surrounded by the gas layer A over the entire circumference.
  • the operator may leave a predetermined amount of gas in the cavity H to form the second gas layer A2.
  • the surgeon operates a switch or the like provided on the drive unit 3 to apply a voltage to the piezoelectric element 11.
  • the piezoelectric element 11 breathes and vibrates in the radial direction by the piezoelectric effect to generate ultrasonic waves.
  • the generated ultrasonic waves are emitted to the tip side from the tip side opening 121 via the liquid L filled in the cavity H.
  • the outer peripheral surface 11o of the piezoelectric element 11 is surrounded by the gas layer A over the entire circumference, it is difficult for ultrasonic waves to propagate. Therefore, most of the generated ultrasonic waves are emitted to the tip side from the tip side opening 121. Therefore, the generated ultrasonic waves can be emitted toward the calculus C to be crushed without loss.
  • the ultrasonic treatment device 100 of this embodiment since the outer peripheral surface 11o of the piezoelectric element 11 is surrounded by the gas layer A over the entire circumference, it is difficult for ultrasonic waves to propagate. Therefore, most of the generated ultrasonic waves are emitted to the tip side from the tip side opening 121. Therefore, the generated ultrasonic waves can be emitted toward the calculus C to be crushed without loss.
  • the reflecting surface R reflects the ultrasonic wave toward the tip side, and the ultrasonic wave is preferably stoned. Can be transmitted to C.
  • the piezoelectric element 11 has a tubular shape and has a low impedance even when the diameter is reduced, and it is easy to obtain a high output ultrasonic wave with a low driving voltage. Further, the gas layer A formed on the outer peripheral surface 11o of the piezoelectric element 11 exhibits a function of not transmitting ultrasonic waves even when formed thin. Therefore, even when the gas layer A is formed on the outer peripheral surface 11o of the piezoelectric element 11, the ultrasonic wave oscillating portion 1 can be suitably thinned.
  • the piezoelectric element 11 is made of ceramic, but the piezoelectric element according to the present invention is not limited to this.
  • the piezoelectric element according to the present invention may be formed of a passive element other than ceramic, for example, a piezoelectric single crystal.
  • the piezoelectric element 11 and the outer cylinder 12 are formed in a cylindrical shape, but the piezoelectric element and the outer cylinder according to the present invention are not limited to this.
  • the piezoelectric element and the outer cylinder according to the present invention may be formed in a rectangular tube shape, for example.
  • FIG. 12 is a schematic diagram of the piezoelectric element 11 according to the first embodiment.
  • Example 1 is a piezoelectric element 11 having a longitudinal length of 3 mm, an inner diameter of 0.8 mm, and an outer diameter of 1.0 mm.
  • the outer periphery of the piezoelectric element 11 of Example 1 is in contact with the air layer A. Further, the cavity H is completely filled with the liquid L.
  • FIG. 13 is a schematic diagram of the piezoelectric element 11 according to the second embodiment.
  • Example 2 is a piezoelectric element 11 having a longitudinal length of 3 mm, an inner diameter of 0.8 mm, and an outer diameter of 1.0 mm.
  • the outer periphery of the piezoelectric element 11 of Example 2 is in contact with the air layer A.
  • half of the cavity H is filled with the liquid L, and the second gas layer A2 is formed in the half on the base end side.
  • a reflective surface R is formed at the boundary between the liquid L and the second gas layer A2.
  • FIG. 14 is a schematic diagram of the piezoelectric element 11 according to the third embodiment.
  • Example 1 is a piezoelectric element 11 having a longitudinal length of 1.5 mm, an inner diameter of 0.8 mm, and an outer diameter of 1.0 mm.
  • the outer periphery of the piezoelectric element 11 of Example 1 is in contact with the air layer A. Further, the cavity H is completely filled with the liquid L.
  • a simulation for calculating the acoustic output was performed using Examples 1-3.
  • the liquid L is water and the piezoelectric element 11 is made of ceramics.
  • the drive voltage of the piezoelectric element 11 was set to 1V.
  • the Z-axis was defined as the origin where the tip side opening of the piezoelectric element 11 was located.
  • FIG. 15 is a graph comparing the sound pressure distributions on the central axis C of the piezoelectric element 11.
  • FIG. 16 is a graph in which the maximum value of sound pressure is normalized to 1. As shown in FIG. 15, the maximum value of the sound pressure is highest in Example 1 and lowest in Example 3. In any of the examples, the sound pressure is highest near the center of the region where the liquid L is located.
  • Example 2 Since the resonance resistance of the second embodiment is larger than that of the first embodiment, the absolute value of the sound pressure at the tip side opening is lowered. However, the sound pressure difference between the tip side opening and the sound pressure maximum portion is small. In Example 2, as compared with Example 3, the sound pressure difference between the tip side opening and the sound pressure maximum portion is substantially the same, but the absolute value of the sound pressure at the tip side opening is high.
  • the piezoelectric element 11 according to the second embodiment has a well-balanced configuration in terms of sound pressure at the tip-side opening and sound pressure difference between the tip-side opening and the central portion. Be considered.
  • the present invention can be applied to a medical manipulator having a curved portion.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Surgery (AREA)
  • Veterinary Medicine (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Vascular Medicine (AREA)
  • Radiology & Medical Imaging (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Surgical Instruments (AREA)

Abstract

La présente invention concerne un outil de traitement par ultrasons qui comprend : un élément piézoélectrique qui a une forme cylindrique comportant dans celle-ci une cavité remplie d'un liquide qui propage des ultrasons, et dans lequel la direction de polarisation est la direction de l'épaisseur reliant une surface périphérique interne à une surface périphérique externe ; et un cylindre externe qui retient l'élément piézoélectrique avec une couche de gaz disposée sur le côté de surface périphérique externe de l'élément piézoélectrique. La fréquence de résonance d'oscillation de respiration d'élément piézoélectrique peut être équivalente à la fréquence de résonance dans la direction radiale du liquide dans la cavité. Le rapport de la longueur de l'élément piézoélectrique dans la direction longitudinale par rapport au diamètre interne de l'élément piézoélectrique peut être de 3,5 ou plus.
PCT/JP2019/007064 2019-02-25 2019-02-25 Outil de traitement par ultrasons WO2020174532A1 (fr)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5220412B2 (fr) * 1974-11-20 1977-06-03
JPH06217989A (ja) * 1993-01-29 1994-08-09 Olympus Optical Co Ltd 温熱治療装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5220412B2 (fr) * 1974-11-20 1977-06-03
JPH06217989A (ja) * 1993-01-29 1994-08-09 Olympus Optical Co Ltd 温熱治療装置

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