WO2015072326A1 - 振動発生ユニット、振動体ユニット及び超音波処置装置 - Google Patents
振動発生ユニット、振動体ユニット及び超音波処置装置 Download PDFInfo
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- WO2015072326A1 WO2015072326A1 PCT/JP2014/078625 JP2014078625W WO2015072326A1 WO 2015072326 A1 WO2015072326 A1 WO 2015072326A1 JP 2014078625 W JP2014078625 W JP 2014078625W WO 2015072326 A1 WO2015072326 A1 WO 2015072326A1
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Classifications
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- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B3/00—Methods or apparatus specially adapted for transmitting mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B3/02—Methods or apparatus specially adapted for transmitting mechanical vibrations of infrasonic, sonic, or ultrasonic frequency involving a change of amplitude
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- 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
- B06B3/00—Methods or apparatus specially adapted for transmitting mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
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- 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
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- A61B2017/22015—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 using mechanical vibrations, e.g. ultrasonic shock waves in direct contact with, or very close to, the obstruction or concrement the ultrasound transducer being outside patient's body; with an ultrasound transmission member; with a wave guide; with a vibrated guide wire with details of the transmission member
- A61B2017/22018—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 using mechanical vibrations, e.g. ultrasonic shock waves in direct contact with, or very close to, the obstruction or concrement the ultrasound transducer being outside patient's body; with an ultrasound transmission member; with a wave guide; with a vibrated guide wire with details of the transmission member segmented along its length
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Definitions
- the present invention relates to a vibration generating unit that generates ultrasonic vibration used for treatment in an ultrasonic treatment apparatus in which a treatment unit treats a treatment target using ultrasonic vibration.
- the present invention also relates to a vibrating body unit including a treatment unit and a vibration generating unit, and an ultrasonic treatment apparatus including the vibrating body unit.
- Patent Document 1 discloses an ultrasonic treatment apparatus in which a surgical tip is provided at a distal end portion as a treatment portion.
- This ultrasonic treatment apparatus is provided with a vibration generating unit including a piezoelectric crystal (piezoelectric element) that converts electric current into ultrasonic vibration.
- a vibration transmission rod is extended on the tip direction side of the vibration generating unit.
- a surgical tip is attached to the distal end side of the vibration transmission rod.
- the ultrasonic vibration generated in the piezoelectric crystal is transmitted from the proximal direction to the distal direction through the vibration transmission rod.
- the surgical chip treats a treatment target such as a living tissue using the transmitted ultrasonic vibration.
- a vibration transmitting rod and a surgical tip form a distal vibration transmitting portion that is connected to the distal direction side of the vibration generating unit and transmits ultrasonic vibrations from the vibration generating unit.
- the vibrating body unit is formed by the vibration generating unit, the vibration transmitting rod, and the surgical tip.
- the distal-side vibration transmission unit (vibration transmission rod and surgical tip) provided with the treatment unit is discarded, and an expensive piezoelectric element ( The vibration generating unit including the piezoelectric crystal is reused.
- the type of material forming the tip-side vibration transmission unit may be different for each tip-side vibration transmission unit.
- the aluminum content may be different for each tip-side vibration transmission part. From the above viewpoint, the Young's modulus varies for each tip vibration transmitting portion.
- the vibrating body unit in response to changes in the tip-side vibration transmission unit connected to the vibration generation unit ( The resonance frequency due to the ultrasonic vibration of the vibration generating unit, the vibration transmitting rod, and the surgical tip changes. That is, the variation in Young's modulus for each tip-side vibration transmission unit affects the resonance frequency of the vibration body unit, and the variation in the Young's modulus for each tip-side vibration transmission unit causes a variation in the resonance frequency of the vibration body unit. .
- the resonance frequency of the vibrating body unit changes in response to the change in the vibration transmission unit on the front end side connected to the vibration generating unit, which complicates the measurement of the resonance frequency of the vibrating body unit by the power supply unit. Problems such as the current supplied to the sonic vibration being not properly controlled occur. Thereby, the treatment performance in the treatment using ultrasonic vibration is deteriorated.
- the present invention has been made paying attention to the above-mentioned problems, and the object of the present invention is to reduce the variation in the resonance frequency of the vibrator unit even when the variation in Young's modulus occurs in each tip-side vibration transmitting portion. It is to provide a vibration generating unit. Another object of the present invention is to provide a vibrating body unit including the vibration generating unit and the distal end side vibration transmission unit, and an ultrasonic treatment apparatus including the vibrating body unit.
- an ultrasonic vibration transmitted to the distal-side vibration transmitting unit by connecting a distal-side vibration transmitting unit provided with a treatment unit at the distal end to the distal direction side.
- a vibration generating unit that generates ultrasonic vibrations when electric current is supplied; a vibrator mounting unit on which the ultrasonic vibrator is mounted; and A proximal-side vibration transmitting portion that extends along the longitudinal axis on the proximal direction side and transmits the ultrasonic vibration generated by the ultrasonic transducer from the distal direction to the proximal direction,
- the anti-vibration position closest to the ultrasonic transducer among the anti-vibration anti-vibration positions located on the proximal direction side of the ultrasonic transducer is the reference anti-vibration position
- a base end side vibration transmitting portion in which the base end is located at a position away from the end direction; and between the base end of the base end side vibration transmitting portion and the reference antinode position in an axis parallel direction parallel to the longitudinal axis
- a vibration generating unit that can reduce the variation in the resonance frequency of the vibrating body unit even when the variation in Young's modulus occurs in each tip-side vibration transmission unit.
- a vibrating body unit including the vibration generating unit and the distal end side vibration transmission unit, and an ultrasonic treatment apparatus including the vibrating body unit.
- FIG. 1 is a schematic view showing an ultrasonic treatment apparatus according to a first embodiment of the present invention.
- FIG. 3 is a cross-sectional view schematically illustrating a configuration of a vibrator unit according to the first embodiment. It is sectional drawing which shows schematically the vibrating body unit which concerns on 1st Embodiment. It is sectional drawing which shows schematically the vibrating body unit which concerns on a comparative example.
- FIG. 6 is a cross-sectional view schematically showing a vibrating body unit according to a first modification of the first embodiment. It is sectional drawing which shows roughly the vibrating body unit which concerns on 2nd Embodiment.
- FIG. 1 is a diagram showing a test vibrator 100 used for verification of a vibration state.
- the vibration state is verified by simulation or the like, and the relationship between the Young's modulus (E) and the resonance frequency (Fr) is verified using the test vibrator 100.
- the test vibrating body 100 is extended along the extending axis T.
- one of the directions parallel to the extending axis T is defined as a first extending direction (the direction of the arrow T1 in FIG. 1), and a direction opposite to the first extending direction is defined as a second extending direction (FIG. 1 (direction of arrow T2).
- the test vibrator 100 ultrasonic vibration is transmitted from the first extending direction to the second extending direction.
- the test vibrating body 100 has antinode positions A′1 to A′6 and node positions N′1 to N′5. That is, the test vibrator 100 vibrates in a predetermined vibration state having the antinode positions A′1 to A′6 and the node positions N′1 to N′5 by transmitting ultrasonic vibration.
- the test vibrator 100 includes, in order from the first extending direction, a first transmission region 101, a second transmission region 102, a third transmission region 103, a fourth transmission region 104, and a fifth transmission region 105. Is extended.
- the first transmission area 101 extends between the antinode position A′1 and the antinode position A′2, and the second transmission area 102 extends between the antinode position A′2 and the antinode position A′3.
- the third transmission area 103 extends between the antinode position A′3 and the antinode position A′4, and the fourth transmission area 104 extends between the antinode position A′4 and the antinode position A′5.
- the fifth transmission region 105 is extended between the antinode position A′5 and the antinode position A′6.
- the third transmission region 104 includes a cross-sectional area reducing portion 106, a first extending portion 107 extending from the cross-sectional area reducing portion 106 in the first extending direction, and a cross-sectional area reducing portion 106 to the first A second extending portion 108 extending in the extending direction of the second extending portion 108.
- the node position N ′ 3 where the stress due to the ultrasonic vibration acts is located in the cross-sectional area reducing portion 106.
- the cross-sectional area reducing portion 106 makes the cross-sectional area perpendicular to the extending axis T of the second extending portion 108 smaller than that of the first extending portion 107.
- the cross-sectional area reducing unit 106 increases (increases) the amplitude of the ultrasonic vibration.
- the cross-sectional area perpendicular to the extension axis T is S1.
- the cross-sectional area perpendicular to the extending axis T is S2, which is smaller than the cross-sectional area S1.
- a cross-sectional area enlarged portion 109 is provided at the antinode position A′4 between the third transmission region 103 and the fourth transmission region 104. That is, when the test vibrating body 100 vibrates in a predetermined vibration state, the antinode position A ′ 3 is located in the cross-sectional area enlarged portion 109. Due to the cross-sectional area enlarged portion 109, the cross-sectional area perpendicular to the extending axis T of the fourth transmission region 104 becomes larger than that of the second extending portion 108 of the third transmission region 103. However, the stress caused by the ultrasonic vibration is zero at the antinode position A′3 located in the cross-sectional area enlargement portion 109.
- the cross-sectional area perpendicular to the extending axis T in the fourth transmission region 104 and the fifth transmission region 105 is the same as that of the first transmission region 101 and the second transmission region 102, and is S1.
- the relationship between the Young's modulus (E) and the resonance frequency (Fr) was verified by changing the transformation ratio (magnification ratio) of the ultrasonic vibration in the cross-sectional area reduction unit 106. That is, the verification was performed by changing the ratio of the sectional area S1 perpendicular to the extending axis T of the first extending part 107 to the sectional area S2 perpendicular to the extending axis T of the second extending part 108. . Then, the change in the resonance frequency (Fr) of the test vibrator 100 with respect to the change in the Young's modulus (E) in the fourth transmission region 104 at each metamorphic ratio was verified.
- the change in the Young's modulus (E) of the fourth transmission region 104 increases in the resonance frequency (Fr) of the test vibrating body 100 as the transformation ratio of the ultrasonic vibration in the cross-sectional area reduction unit 106 increases. It has been demonstrated to have an effect. That is, as the amplitude of the ultrasonic vibration in the fourth transmission region 104 increases, the influence of the Young's modulus (E) of the fourth transmission region 104 on the resonance frequency (Fr) of the test vibrating body 100 increases. Even when the Young's modulus (E) of the fifth transmission region 105 was changed, the same result as when the Young's modulus (E) of the fourth transmission region 104 was changed was obtained.
- the Young's modulus (E ) Has a greater effect on the resonance frequency (Fr) of the test vibrator 100. From the above, it was demonstrated that the influence of the Young's modulus (E) on the resonance frequency (Fr) increases as the amplitude of the ultrasonic vibration increases.
- the change in the resonance frequency (Fr) of the test vibrator 100 with respect to the change in the Young's modulus (E) in the third transmission region 103 was also verified at each transformation ratio.
- the third transmission region 103 is provided with a second extending portion 108 having a smaller cross-sectional area S2 perpendicular to the extending axis T, so that the third transmission region 103 is compared with the fourth transmission region 104 and the fifth transmission region 105.
- the volume is reduced. Therefore, when the Young's modulus (E) is changed in the third transmission region 103, compared to the case where the Young's modulus (E) is changed in the fourth transmission region 104 (fifth transmission region 105).
- the relationship between Young's modulus (E) and resonance frequency (Fr) showed a different tendency.
- the Young's modulus (E) is changed between the case where the Young's modulus (E) is changed in the third transmission region 103 and the case where the Young's modulus (E) is changed in the fourth transmission region 104.
- the reason why the tendency of the relationship between the resonance frequency (Fr) and the resonance is different was investigated.
- the volume of the region where the Young's modulus (E) is changed affects the relationship between the Young's modulus (E) and the resonance frequency (Fr). Has been demonstrated.
- the volume of the third transmission region 103 (that is, the cross-sectional area S2 perpendicular to the extending axis T in the second extending portion 108) is the relationship between the Young's modulus (E) and the resonance frequency (Fr). Influenced. That is, it was proved that the influence of the Young's modulus (E) on the resonance frequency (Fr) increases as the volume increases.
- FIG. 2 is a diagram showing a configuration of the ultrasonic treatment apparatus 1 of the present embodiment.
- the ultrasonic treatment apparatus 1 includes a hand piece (treatment unit) 2 that is an ultrasonic treatment instrument, and a vibrator unit 3 that is coupled to the hand piece 2.
- the ultrasonic treatment apparatus 1 has a longitudinal axis C that passes through the handpiece 2 and the transducer unit 3.
- one of the directions parallel to the longitudinal axis C is defined as the distal direction (the direction of the arrow C1 in FIG. 2), and the direction opposite to the distal direction is defined as the proximal direction (the direction of the arrow C2 in FIG. 2).
- the vibrator unit 3 is coupled to the handpiece 2 from the proximal direction side.
- the handpiece 2 is an ultrasonic coagulation / incision treatment tool for incising a treatment target such as a living tissue simultaneously with coagulation using ultrasonic vibration.
- the handpiece 2 includes a holding unit 5, a sheath 6, an ultrasonic probe 7 that is a distal end side vibration transmission unit, and a jaw 8.
- the holding unit 5 is rotatable with respect to the cylindrical case portion 11 extending along the longitudinal axis C, a fixed handle 12 formed integrally with the cylindrical case portion 11, and the cylindrical case portion 11. And a movable handle 13 to be attached.
- the holding unit 5 includes a rotation operation knob 15 attached to the distal direction side of the cylindrical case portion 11.
- the rotation operation knob 15 can rotate around the longitudinal axis C with respect to the cylindrical case portion 11.
- a supply operation input button 16 that is a supply operation input unit is attached to the fixed handle 12.
- the sheath 6 extends along the longitudinal axis C.
- the sheath 6 is attached to the holding unit 5 by being inserted into the inside of the rotation operation knob 15 and the inside of the cylindrical case portion 11 from the distal direction side.
- the ultrasonic probe 7 that is the distal end side vibration transmission portion extends along the longitudinal axis C from the inside of the cylindrical case portion 11 toward the distal end direction.
- the ultrasonic probe 7 is inserted through the sheath 6.
- the ultrasonic probe 7 is provided with a treatment portion 17 that protrudes from the distal end of the sheath 6 toward the distal direction.
- the jaw 8 is rotatably attached to the distal end portion of the sheath 6.
- the movable handle 13 is connected to a movable cylindrical portion (not shown) of the sheath 6 inside the cylindrical case portion 11.
- the tip of the movable cylindrical portion is connected to the jaw 8.
- the movable tubular portion moves along the longitudinal axis C by opening and closing the movable handle 13 with respect to the fixed handle 12.
- the jaw 8 rotates around the attachment position to the sheath 6 and opens or closes the treatment portion 17 of the ultrasonic probe 7.
- the sheath 6, the ultrasonic probe 7, and the jaw 8 are rotatable about the longitudinal axis C with respect to the cylindrical case portion 11 integrally with the rotation operation knob 15.
- the power supply unit 20 includes a current supply unit 21 that outputs a current and a supply control unit 22 that controls the current supply unit 21.
- the current supply unit 21 is formed from, for example, a power supply and an amplifier circuit (drive circuit), and the supply control unit 22 is formed from, for example, a CPU (Central Processing Unit) or an ASIC (application specific integrated circuit) and a storage unit such as a memory. Is formed.
- the power supply unit 20 is a power supply device including components, circuits, and the like that form the current supply unit 21 and the supply control unit 22, for example.
- FIG. 3 is a diagram showing the configuration of the vibrator unit 3.
- the vibrator unit includes an outer vibrator case 25 and an inner vibrator case 26 positioned inside the outer vibrator case 25.
- the outer vibrator case 25 and the inner vibrator case 26 extend along the longitudinal axis C and are inserted into the cylindrical case portion 11 of the holding unit 5 from the proximal direction side.
- the outer vibrator case 25 and the inner vibrator case 26 are connected to the sheath 6 inside the cylindrical case portion 11.
- a vibration generation unit 30 that generates ultrasonic vibration is provided inside the inner vibrator case 26.
- the vibrator unit 3 is formed by the outer vibrator case 25, the inner vibrator case 26 and the vibration generation unit 30.
- the vibration generating unit 30 includes an ultrasonic transducer 31.
- the ultrasonic transducer 31 includes piezoelectric elements 32A to 32D (four in the present embodiment) that convert electric current into ultrasonic vibration, and two electrode portions 33A and 33B.
- the direction away from the longitudinal axis C is defined as the outer peripheral direction (separate axis direction), and the direction opposite to the outer peripheral direction is defined as the inner peripheral direction (axial direction).
- the inner vibrator case 26 is formed with two through holes 27A and 27B penetrating the inner vibrator case 26 in the radial direction.
- a gap 28 is formed between the outer vibrator case 25 and the inner vibrator case 26 in the radial direction.
- 33 A of electrode parts are provided with the protrusion part 35A which protrudes toward the outer peripheral direction in the clearance gap part 28 from 27 A of through-holes.
- the electrode portion 33B includes a protruding portion 35B that protrudes from the through hole 27B to the gap portion 28 toward the outer peripheral direction.
- One end of an electrical wiring 36A is connected to the protruding portion 35A of the electrode portion 33A.
- One end of the electrical wiring 36B is connected to the protrusion 35B of the electrode portion 33B.
- the electrical wirings 36 ⁇ / b> A and 36 ⁇ / b> B extend through the gap 28 and the inside of the cable 18.
- the other ends of the electrical wirings 36 ⁇ / b> A and 36 ⁇ / b> B are connected to the current supply unit 21 of the power supply unit 20.
- the vibration generating unit 30 includes a columnar horn member 37 to which the ultrasonic transducer 31 is attached.
- the horn member 37 extends along the longitudinal axis C.
- the horn member 37 includes a transducer mounting portion 38 to which the ultrasonic transducer 31 is mounted.
- the horn member 37 is formed with a cross-sectional area changing portion 41 on the tip end side from the vibrator mounting portion 38. In the cross-sectional area changing portion 41, the cross-sectional area perpendicular to the longitudinal axis C decreases from the proximal direction toward the distal direction.
- a female screw portion 42 is formed at the tip of the horn member 38. The female screw portion 42 is located on the distal direction side from the cross-sectional area changing portion 41.
- a male screw portion 43 is formed at the base end portion of the vibrator mounting portion 38.
- the vibration generating unit 30 includes a columnar rod-like member 45 that is a base end side vibration transmitting portion extending along the longitudinal axis C on the base end direction side of the vibration mounting portion 38.
- the ultrasonic probe 7 is connected to the tip direction side of the vibration generating unit 30.
- the ultrasonic probe 7 is connected to the vibration generating unit 30 inside the cylindrical case portion 11.
- the vibrating body unit 10 that vibrates by ultrasonic vibration is formed.
- FIG. 4 is a diagram illustrating a configuration of the vibrating body unit 10.
- a male screw portion 46 is formed at the proximal end portion of the ultrasonic probe 7.
- the ultrasonic probe 7 is connected to the distal direction side of the horn member 37 of the vibration generating unit 30.
- a female screw portion 47 is formed at the tip of the rod-like member 45.
- the ultrasonic transducer 31 is mounted on the transducer mounting portion 38 while being sandwiched between the cross-sectional area changing portion 41 of the horn member 37 and the rod-shaped member 45.
- the ultrasonic probe 7, the horn member 37, and the rod-like member 45 are made of a material having high ultrasonic vibration transmission properties such as 64 titanium.
- the operation signal is transmitted to the inner vibrator case 26 and the electric signal path extending through the cable 18 from the power supply unit 20. It is transmitted to the supply control unit 22. Thereby, the supply control unit 22 controls the current supply unit 21, and current is supplied from the current supply unit 21 to the ultrasonic transducer 31. Then, ultrasonic vibration is generated by the ultrasonic transducer 31.
- the ultrasonic vibration generated by the ultrasonic transducer 31 is transmitted to the ultrasonic probe 7 through the horn member 37. At this time, the amplitude of the ultrasonic vibration is enlarged at the cross-sectional area changing portion 41 of the horn member 37.
- ultrasonic vibration is transmitted from the proximal direction to the distal direction.
- tip part of the ultrasonic probe 7 treats treatment objects, such as a biological tissue, using the transmitted ultrasonic vibration.
- the ultrasonic vibration generated by the ultrasonic vibrator 31 is transmitted to the rod-shaped member 45. In the rod-shaped member 45, ultrasonic vibration is transmitted from the distal direction to the proximal direction. Note that, depending on the ultrasonic vibration, the vibrating body unit 10 performs longitudinal vibration in which the vibration direction and the transmission direction are parallel to the longitudinal axis C.
- the vibrating body unit 10 vibrates at a resonance frequency Fr having an antinode position (for example, A1 to A3) and a node position (for example, N1, N2).
- the tip of the vibrating body unit 10 (tip of the ultrasonic probe 7) is the antinode position A1 of ultrasonic vibration.
- the base end of the vibrating body unit 10 (the base end of the rod-like member 45) is an antinode position A3 for ultrasonic vibration.
- the antinode position A1 is the most advanced antinode position located on the most distal direction side among antinode positions (for example, A1 to A3) of ultrasonic vibration.
- the antinode position A3 is the most proximal antinode position located on the most proximal direction side among ultrasonic antinode positions (for example, A1 to A3).
- the node position N1 of the ultrasonic vibration is located in the cross-sectional area changing portion 41 of the horn member 37.
- the node position N ⁇ b> 1 is located on the distal direction side from the ultrasonic transducer 31.
- the base end of the horn member 37 is the antinode position A2 of the ultrasonic vibration.
- the antinode position A2 is located closer to the proximal direction than the ultrasonic transducer 31. Further, when the antinode position closest to the ultrasonic transducer 31 among the antinode positions (for example, A2 and A3) of the ultrasonic vibration located on the proximal direction side of the ultrasonic transducer 31 is the antinode position,
- the position A2 is the reference antinode position.
- the base end of the rod-like member 45 serving as the base end side transmission portion is located at the abdominal position (reference antinode) by an extension dimension L1 equal to the half wavelength (one half the half wavelength) of the ultrasonic vibration at the resonance frequency Fr. Position) Located at a position away from A2 in the proximal direction. Therefore, in the axis parallel direction parallel to the longitudinal axis C, the antinode position (most proximal antinode position) A3 is separated from the antinode position (reference antinode position) A2 by the extending dimension L1 equal to the half wavelength of the ultrasonic vibration. .
- the rod-like member 45 that is the proximal-side vibration transmitting portion is provided with a cross-sectional area reducing portion 51 between the proximal end of the rod-like member 45 and the antinode position (reference antinode position) A2 in the direction parallel to the longitudinal axis C. It has been.
- a first transmission region 52 extends from the cross-sectional area reducing portion 51 in the distal direction
- a second transmission region 53 extends from the cross-sectional area reducing portion 51 in the proximal direction. Therefore, the cross-sectional area reducing portion 51 is located between the first transmission region 52 and the second transmission region 53 in the axis parallel direction.
- the cross-sectional area reducing portion 51 Due to the cross-sectional area reducing portion 51, the cross-sectional area of the rod-like member 45 perpendicular to the longitudinal axis C is reduced in the second transmission region 53 compared to the first transmission region 52.
- the cross-sectional area reducing portion 51 is located at the node position N2 of ultrasonic vibration at the resonance frequency Fr.
- the stress due to ultrasonic vibration acts at a position different from the antinode position (for example, A1 to A3) of ultrasonic vibration.
- the amplitude of the ultrasonic vibration increases by reducing the cross-sectional area perpendicular to the longitudinal axis C at the position where the stress due to the ultrasonic vibration acts.
- the cross-sectional area perpendicular to the longitudinal axis C of the rod-like member 45 (vibrating body unit 10) is reduced in the cross-sectional area reducing portion 51, the amplitude of ultrasonic vibration transmitted from the distal direction to the proximal direction is increased.
- the cross-sectional area reducing part 51 becomes an amplitude expanding part that expands the amplitude of the ultrasonic vibration transmitted in the proximal direction in the rod-shaped member 45.
- the stress due to the ultrasonic vibration is larger at the node positions (for example, N1, N2) of the ultrasonic vibration than at positions other than the node positions. Since the cross-sectional area perpendicular to the longitudinal axis C of the rod-like member 45 decreases at the node position N2 where the stress due to ultrasonic vibration is large, the amplitude transformation ratio (magnification ratio) of the ultrasonic vibration at the cross-sectional area reducing portion 51 increases. . The ratio of the amplitude in the second transmission region 53 to the amplitude in the first transmission region 52 is increased by increasing the amplitude transformation ratio of the ultrasonic vibration in the cross-sectional area reducing unit 51.
- the node position N2 is closest to the abdominal position (reference abdominal position) A2 among the ultrasonic vibration node positions (for example, N2) located on the proximal direction side of the abdominal position (reference abdominal position) A2.
- the operation and effect of the ultrasonic treatment apparatus 1 will be described.
- a treatment target such as a living tissue
- the sheath 6, the ultrasonic probe 7, and the jaw 8 are inserted into the body cavity.
- the treatment target is positioned between the jaw 8 and the treatment unit 17.
- the jaw 8 performs the closing operation on the treatment portion 17, and the treatment target is gripped between the jaw 8 and the treatment portion 17.
- a supply operation is input with the supply operation input button 16 while the treatment target is held, a current is supplied from the current supply unit 21 to the ultrasonic transducer 31.
- ultrasonic vibration is generated in the ultrasonic transducer 31, and the ultrasonic vibration is transmitted from the proximal direction to the distal direction in the ultrasonic probe 7.
- the treatment unit 17 performs treatment using the transmitted ultrasonic vibration, and the treatment target is incised simultaneously with coagulation as described above.
- the generated ultrasonic vibration is transmitted from the distal direction to the proximal direction in the rod-shaped member 45.
- the ultrasonic probe (tip-side vibration transmission unit) 7 provided with the treatment unit 17 is discarded, and the vibration generating unit 30 (the transducer unit 3) including the expensive piezoelectric elements 32A to 32D is reused. . Therefore, the ultrasonic probe 7 is replaced for each treatment.
- the type of material forming the ultrasonic probe 7 may be different for each ultrasonic probe 7.
- the aluminum content may be different for each ultrasonic probe 7. For this reason, variation in Young's modulus Ea occurs for each ultrasonic probe 7.
- the Young's modulus Ea of the ultrasonic probe 7 affects the resonance frequency Fr of the vibrating body unit 10.
- the resonance frequency Fr of the vibrating body unit 10 changes corresponding to the change of the ultrasonic probe 7 connected to the vibration generating unit 30. That is, the resonance frequency Fr of the vibrating body unit 10 varies due to variations in the Young's modulus Ea for each ultrasonic probe 7.
- a vibrating body unit 10 ' is shown in FIG. As shown in FIG. 5, the vibrating body unit 10 ′ is provided with an ultrasonic probe 7 ′, a horn member 37 ′, and an ultrasonic vibrator 31 ′, similarly to the vibrating body unit 10 of the first embodiment. Yes. Further, the vibrating body unit 10 'vibrates at a resonance frequency Fr having an antinode position (for example, A1, A2) and a node position (for example, N1). And antinode position A1 located in the front-end
- antinode position A1 located in the front-end
- the vibration body unit 10 ′ (vibration generation unit 30 ′) is provided with a rod-shaped member (base end side vibration transmission unit) 45. Instead, a back mass 45 'is provided instead.
- the ultrasonic transducer 31 ′ is mounted on the transducer mounting portion 38 ′ while being sandwiched between the cross-sectional area changing portion 41 ′ and the back mass 45 ′ of the horn member 37 ′.
- the base end of the back mass 45 ′ coincides with the base end of the horn member 37 ′ in the axis parallel direction parallel to the longitudinal axis C. Therefore, the base end of the horn member 37 ′ becomes the base end of the vibrating body unit 10 ′ (base end of the vibration generating unit 30 ′). Further, in the vibrating body unit 10 ′, the antinode position A2 located at the base end of the vibrating body unit 10 ′ is the most proximal antinode position, and only one antinode position A2 is closer to the proximal end side than the ultrasonic transducer 31 ′. To position.
- the vibration unit 10 ′ (vibration generation unit 30 ′) is half the size of the ultrasonic vibration in the dimension in the axis parallel direction as compared with the vibration unit 10 (vibration generation unit 30) of the first embodiment.
- the wavelength is reduced.
- the Young's modulus Eb of the vibration generating unit 30 ′ has less influence on the resonance frequency Fr of the vibrating body unit 10 ′. For this reason, the variation in Young's modulus Ea for each ultrasonic probe 7 'has a great influence on the resonance frequency Fr of the vibrating body unit 10'.
- a rod-shaped member (base end side vibration transmission unit) 45 is provided. ing.
- the Young's modulus Ec of the rod-shaped member 45 affects the resonance frequency Fr of the vibrating body unit 10. That is, the vibration of the vibrating body unit 10 to the resonance frequency Fr is obtained by increasing the dimension in the axis parallel direction by a half wavelength of the ultrasonic vibration as compared with the case where the rod-like member 45 is not provided (comparative example in FIG. 5).
- the influence of the Young's modulus Eb of the generation unit 30 is increased. Therefore, compared with the comparative example of FIG. 5, the influence of the variation of the Young's modulus Ea of each ultrasonic probe 7 on the resonance frequency Fr of the vibrating body unit 10 is reduced.
- the amplitude of the ultrasonic vibration transmitted from the tip end direction to the base end direction is increased by the cross-sectional area reducing portion 51.
- the amplitude of an ultrasonic vibration becomes large. From the result of the verification of the vibration state described above, the influence of the Young's modulus (E) on the resonance frequency (Fr) increases as the amplitude of the ultrasonic vibration increases.
- the influence of the Young's modulus Ec of the rod-shaped member 45 on the resonance frequency Fr of the vibrating body unit 10 is increased.
- the influence of the Young's modulus Eb of the vibration generating unit 30 on the resonance frequency Fr is further increased. Therefore, the influence of the variation in Young's modulus Ea for each ultrasonic probe 7 on the resonance frequency Fr of the vibrating body unit 10 is further reduced. Thereby, even when the Young's modulus Ea varies for each ultrasonic probe 7 that is the tip-side vibration transmission unit, the variation of the resonance frequency Fr of the vibrating body unit 10 can be reduced.
- the stress due to the ultrasonic vibration becomes larger than the positions other than the node positions. Since the cross-sectional area reducing portion 51 is provided at the node position N2 where the stress of the ultrasonic vibration becomes large, the amplitude transformation ratio (magnification ratio) of the ultrasonic vibration in the cross-sectional area reducing portion 51 becomes large. As the amplitude transformation ratio of the ultrasonic vibration in the cross-sectional area reducing portion 51 increases, the amplitude in the second transmission region 53 increases.
- the influence of the Young's modulus Ec of the rod-shaped member 45 on the resonance frequency Fr of the vibrating body unit 10 is further increased, and the influence of the variation of the Young's modulus Ea for each ultrasonic probe 7 on the resonance frequency Fr of the vibrating body unit 10 is increased. Becomes even smaller. Thereby, even when the variation in Young's modulus Ea occurs for each ultrasonic probe 7 that is the tip-side vibration transmission unit, the variation in the resonance frequency Fr of the vibrating body unit 10 can be further effectively reduced.
- the base end of the rod-shaped member 45 (the base end of the vibrating body unit 10) is located at a position away from the antinode position (reference antinode position) A2 by the half wavelength of the ultrasonic vibration in the base end direction.
- it is located, it is not limited to this.
- it is equal to one wavelength of ultrasonic vibration at the resonance frequency Fr from the antinode position (reference antinode position) A2 (twice the half wavelength).
- the base end of the rod-shaped member 45 (the base end of the vibrating body unit 10) may be located at a position separated in the base end direction by the extending dimension L2.
- the vibrating body unit 10 of this modification vibrates at a resonance frequency Fr having an antinode position (for example, A1 to A4) and a node position (for example, N1 to N3).
- the antinode position A1 located at the distal end of the ultrasonic probe 7 is the most distal antinode position
- the antinode position A4 located at the proximal end of the rod-like member 45 is the most proximal antinode position.
- the antinode position (reference antinode position) A2 is located at the proximal end of the horn member 37, and is among the antinode positions (for example, A2 to A4) of ultrasonic vibration located on the proximal direction side of the ultrasonic transducer 31.
- the antinode position closest to the ultrasonic transducer 31 Therefore, in this modification, the dimension of the rod-like member 45 (vibrating body unit 10) in the axis parallel direction parallel to the longitudinal axis C is increased by a half wavelength compared to the first embodiment.
- a cross-sectional area decreasing portion 51 that is an amplitude expanding portion is provided at the node position N2 between the antinode position A2 and the antinode position A3.
- the second transmission region 53 extends in the proximal direction through the antinode position A3 to the antinode position (most proximal antinode position) A4.
- the node position N2 is the most antinode position (reference abdominal position) among ultrasonic vibration node positions (for example, N2 and N3) located on the proximal direction side from the antinode position (reference antinode position) A2. Close to A2.
- the dimension of the second transmission region 53 in the axial parallel direction is increased by a half wavelength as compared with the first embodiment.
- the volume of the second transmission region 53 having a large amplitude of ultrasonic vibration is increased.
- the influence of the Young's modulus (E) on the resonance frequency (Fr) increases as the volume increases. Since the volume of the second transmission region 53 in the rod-shaped member 45 is increased, the influence of the Young's modulus Ec of the rod-shaped member 45 on the resonance frequency Fr of the vibrating body unit 10 is increased as compared with the first embodiment. The influence of the Young's modulus Eb of the vibration generating unit 30 on the resonance frequency Fr of the vibrating body unit 10 is further increased.
- FIG. 7 is a diagram illustrating a configuration of the vibrating body unit 10 according to the second embodiment.
- the vibrating body unit 10 of the present embodiment vibrates at a resonance frequency Fr having an antinode position (for example, A1 to A4) and a node position (for example, N1 to N3).
- the antinode position A1 located at the distal end of the ultrasonic probe 7 is the most distal antinode position
- the antinode position A4 located at the proximal end of the rod-like member 45 is the most proximal antinode position.
- the antinode position (reference antinode position) A2 is located at the proximal end of the horn member 37, and is among the antinode positions (for example, A2 to A4) of ultrasonic vibration located on the proximal direction side of the ultrasonic transducer 31.
- a cross-sectional area decreasing portion 51 that is an amplitude expanding portion is provided at the node position N2 between the antinode position A2 and the antinode position A3.
- the node position N2 is closest to the abdominal position (reference abdominal position) A2 among the ultrasonic vibration node positions (for example, N2 and N3) located on the proximal direction side of the abdominal position (reference abdominal position) A2.
- region 55 is following the base end direction side of the 2nd transmission area
- the first extending region 55 is located on the proximal direction side with respect to the cross-sectional area decreasing portion 51 that is the amplitude expanding portion.
- the second transmission region 53 and the first extension region 55 are extended between the node position N2 and the antinode position A3.
- the rod-like member 45 is provided with a second extending region 56 on the proximal direction side from the first extending region 55.
- the second extending region 56 extends from the antinode position A3 toward the proximal direction.
- region 56 is extended to the antinode position (most proximal end antinode position) A4 located in the base end (base end of the vibrating body unit 10) of the rod-shaped member 45. As shown in FIG.
- a cross-sectional area enlarged portion 57 is provided between the first extension region 55 and the second extension region 56 in the axis parallel to the longitudinal axis C.
- the cross-sectional area enlarged portion 57 enlarges the cross-sectional area of the rod-like member 45 perpendicular to the longitudinal axis C in the second extending region 56 as compared with the first extending region 55. Thereby, the volume of the second extending region 56 is increased.
- the antinode position (cross-section change antinode position) A3 is located in the cross-sectional area enlarged portion 57.
- the antinode position (cross sectional area changing antinode position) A3 is one of the antinode positions of the ultrasonic vibration located between the cross sectional area reducing portion 51, which is the amplitude expanding portion, and the base end of the rod-like member 45 in the axis parallel direction. .
- the antinode position (cross section change antinode position) A3 is the cross section area decreasing portion (amplitude expanding portion) among the antinode positions (for example, A3 and A4) of ultrasonic vibration located on the proximal direction side from the cross sectional area decreasing portion 51. ) Close to 51.
- the stress due to the ultrasonic vibration becomes zero. Since the stress due to the ultrasonic vibration does not act, the amplitude of the ultrasonic vibration does not decrease (does not change) in the cross-sectional area enlargement portion 57 even if the cross-sectional area perpendicular to the longitudinal axis C increases (changes). Therefore, the ultrasonic vibration is transmitted from the first extending region 55 to the second extending region 56 without reducing the amplitude.
- the ultrasonic vibration is transmitted to the second extending region 56 in a state where the amplitude expanded by the cross-sectional area reducing portion 51 is maintained. For this reason, in the second extended region 56, the amplitude of the ultrasonic vibration is increased.
- the second extending region 56 having a large amplitude and a large cross-sectional area (that is, volume) perpendicular to the longitudinal axis C extends in the rod-shaped member 45 over a half wavelength of the ultrasonic vibration.
- the Young's modulus Ec of the rod-like member 45 is higher than the resonance frequency of the vibrator unit 10 as compared with the first embodiment.
- the influence on Fr is increased, and the influence of the Young's modulus Eb of the vibration generating unit 30 on the resonance frequency Fr of the vibrating body unit 10 is further increased. Therefore, the influence of the variation in Young's modulus Ea for each ultrasonic probe 7 on the resonance frequency Fr of the vibrating body unit 10 is further reduced. Thereby, even when the variation in Young's modulus Ea occurs for each ultrasonic probe 7 that is the tip-side vibration transmission unit, the variation in the resonance frequency Fr of the vibrating body unit 10 can be further effectively reduced.
- the antinode position (for example, A3 and A4) of the ultrasonic vibration located on the proximal direction side of the cross-sectional area decreasing portion 51 is the antinode position (the cross-section changing anti-node position) A3 located in the cross-sectional area enlarged portion 55. Close to the cross-sectional area reduction part (amplitude enlargement part) 51.
- FIG. 8 shows the relationship between the Young's modulus Ea of the ultrasonic probe 7 (7 ′) and the resonance frequency Fr of the vibrating body unit 10 (10 ′) in the comparative example, the first embodiment, and the second embodiment.
- the Young's modulus Ea of the ultrasonic probe 7 (7 ′) connected to the vibration generating unit 30 (30 ′) varies between the maximum value Eamax and the minimum value Eamin.
- the resonance frequency Fr of the vibrating body unit 10 varies between the maximum value Fr1max and the minimum value Fr1min.
- the resonance frequency Fr of the vibration body unit 10 varies between the maximum value Fr2max and the minimum value Fr2min, and the vibration body unit 10 (10 ′) as compared with the comparative example.
- the variation in the resonance frequency Fr is reduced.
- the resonance frequency Fr of the vibration body unit 10 varies between the maximum value Fr3max and the minimum value Fr3min, and the resonance frequency of the vibration body unit 10 is compared with that of the first embodiment. Fr variation is further reduced.
- the Young's modulus Ea of the ultrasonic probe 7 (7 ′) is shown on the horizontal axis, and the resonance frequency Fr of the vibrating body unit 10 (10 ′) is shown on the vertical axis.
- FIG. 9 is a diagram showing the configuration of the vibrator unit 3 and the power supply unit 20 of the present embodiment.
- the vibration generating unit 30 is provided with a memory 61 that is a storage unit.
- the memory 61 stores vibration characteristics of the vibration generating unit 30 due to ultrasonic vibration. For example, information related to the Young's modulus Eb of the vibration generating unit 30, the standard value of the resonance frequency Fr of the vibrating body unit 10, and the like are stored in the memory 61.
- the Young's modulus Eb varies for each vibration generating unit 30 for the same reason as the ultrasonic probe 7. Even when the influence of the variation of the Young's modulus Ea of each ultrasonic probe 7 on the resonance frequency Fr of the vibrating body unit 10 is small, the variation of the Young's modulus Eb of each vibration generating unit 30 causes the variation of the vibration frequency Fr. Occurs. For this reason, the measurement of the resonance frequency Fr of the vibrating body unit 10 by the supply control unit 22 of the power supply unit 20 becomes complicated.
- FIG. 10 is a diagram showing the relationship between the frequency f of the ultrasonic vibration and the acoustic impedance Z.
- the acoustic impedance Z changes corresponding to the vibration state of the vibrating body unit 10. For this reason, as shown in FIG. 10, the acoustic impedance Z changes as the frequency f of the ultrasonic vibration changes.
- the relationship between the frequency f of the ultrasonic vibration and the acoustic impedance Z changes corresponding to the change in the Young's modulus Eb of the vibration generating unit 30.
- vibration generating unit 30 when a certain vibration generating unit 30 (vibration generating unit 30 having Young's modulus Eb1) is used for the vibrating body unit 10, the relationship between the frequency f of the ultrasonic vibration and the acoustic impedance Z is indicated by a solid line in FIG. To change.
- vibration generating unit 30 when another vibration generating unit 30 (vibration generating unit 30 having Young's modulus Eb2) is used for the vibrating body unit 10, the relationship between the frequency f of the ultrasonic vibration and the acoustic impedance Z is indicated by the dotted line in FIG. It changes as shown in.
- the supply control unit 22 controls the current supplied from the current supply unit 21 to the ultrasonic transducer 31 by PLL (Phase Lock Loop) control, and measures the resonance frequency Fr of the vibrator unit 10. . That is, the frequency f at which the acoustic impedance Z is minimized in a predetermined frequency region (for example, ⁇ f1 and ⁇ f2) of ultrasonic vibration is detected as the resonance frequency Fr.
- PLL Phase Lock Loop
- the memory 61 is connected to the supply control unit 22 via the electric signal line 62.
- the supply control unit 22 controls the current supply state from the current supply unit 21 based on the vibration characteristics of the vibration generation unit 30 stored in the memory 61. Further, the supply control unit 22 measures the resonance frequency Fr of the vibrating body unit 10 in which the ultrasonic probe 7 is connected to the vibration generating unit 30 based on the vibration characteristics of the vibration generating unit 30. Since the resonance frequency Fr of the vibrating body unit 10 is measured based on the vibration characteristics of the vibration generating unit 30, the supply control unit 22 can detect the resonance frequency only in a predetermined frequency region (for example, ⁇ f1, ⁇ f2) in the vicinity of the resonance frequency Fr.
- a predetermined frequency region for example, ⁇ f1, ⁇ f2
- the measurement of the resonance frequency Fr of the vibrating body unit 10 is appropriately and easily performed by the supply control unit 22 of the power supply unit 20, and the current is appropriately supplied from the current supply unit 21 of the power supply unit 20 to the ultrasonic transducer 31. Supplied. Therefore, the treatment performance in the treatment using ultrasonic vibration can be effectively ensured.
- ultrasonic transducer 31 In the above-described embodiment and modification, only one ultrasonic transducer 31 is provided in the vibration generating unit 30, but this is not a limitation.
- a plurality of (two in this modification) ultrasonic transducers 31A and 31B may be provided in the vibration generating unit 30.
- the ultrasonic transducers 31 ⁇ / b> A and 31 ⁇ / b> B are located away from each other in the axis parallel direction parallel to the longitudinal axis C.
- the antinode position A3 is the most proximal antinode position.
- the ultrasonic transducer 31B is the most proximal transducer located closest to the proximal direction in the ultrasonic vibration (for example, 31A and 31B).
- the antinode position A2 is located closer to the proximal direction than the ultrasonic transducer (most proximal transducer) 31B.
- the ultrasonic vibration is among the anti-vibration antinodes (for example, A2 and A3) where the antinode position (reference antinode position) A2 is located on the proximal direction side of the ultrasonic transducer (most proximal transducer) 31B.
- the abdominal position is closest to the child 31B.
- the base end of the rod-shaped member 45 (base end of the vibrating body unit 10) has an extension dimension L3 equal to a half wavelength of ultrasonic vibration at the resonance frequency Fr from the antinode position (reference antinode position) A2 toward the base end. Located away. And the cross-sectional area reduction
- the node position N2 of the ultrasonic vibration at the resonance frequency Fr is located in the cross-sectional area reducing portion 51.
- the treatment unit 17 of the vibrator unit 10 is used for ultrasonic coagulation and incision, but is not limited thereto.
- a path portion 65 may be formed along the longitudinal axis C in the vibrating body unit 10 as illustrated in FIG. Since the path portion 65 is formed, the vibrating body unit 10 is formed in a hollow cylindrical shape.
- the distal end surface 66 of the vibrating body unit 10 is used as a treatment portion. Cavitation occurs in the vicinity of the distal end surface 66 when the vibrating body unit 10 vibrates in a state where a liquid such as physiological saline is supplied to the distal end portion of the ultrasonic probe 7.
- a treatment target such as a living tissue is crushed and emulsified. Then, the crushed and emulsified treatment target is sucked and collected through the path portion 65.
- the vibrator unit 10 is used for the ultrasonic suction treatment. Also in this modification, the influence of the variation in Young's modulus Ea for each ultrasonic probe 7 on the resonance frequency Fr of the vibrating body unit 10 is reduced in the same manner as in the above-described embodiment and modification.
- the Young's modulus Ea of the ultrasonic probe 7 has been described.
- the Young's modulus Ea of the ultrasonic probe 7 such as the Boisson ratio and density.
- Other physical properties also affect the resonance frequency Fr of the vibrating body unit 10.
- the Young's modulus Ea of the ultrasonic probe 7 is obtained by providing the vibration generating unit 30 with the rod-shaped member (base-end side vibration transmitting portion) 45 and the cross-sectional area reducing portion (amplitude expanding portion) 51.
- the influence on the resonance frequency Fr of the vibrating body unit 10 such as the Boisson ratio and the density is reduced.
- the proximal-side vibration transmission is performed at a position away from the reference antinode position (A2) in the proximal direction by an extension dimension (L1; L2) equal to an integral multiple of a half wavelength of ultrasonic vibration. It is only necessary that the base end of the portion (45) is located.
- the reference abdominal position (A2) is the most ultrasonic transducer (31; 31B) among the abdominal positions (A2, A3; A2 to A4) located on the proximal direction side of the ultrasonic transducer (31). The abdominal position is close to.
- an amplitude expansion unit (51) that expands the amplitude of the ultrasonic vibration transmitted in the proximal direction between the proximal end of the proximal vibration transmission unit (45) and the reference antinode position (A2) in the axis parallel direction. ) May be provided.
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Abstract
Description
本発明の実施形態を説明する前に、後述の実施形態の参照となる振動状態の検証について、図1を参照して説明する。図1は、振動状態の検証に用いられる試験振動体100を示す図である。振動状態の検証は、シミュレーション等によって行われ、試験振動体100を用いてヤング率(E)と共振周波数(Fr)との関係が検証される。
本発明の第1の実施形態について、図2乃至図5を参照して説明する。図2は、本実施形態の超音波処置装置1の構成を示す図である。図2に示すように、超音波処置装置1は、超音波処置具であるハンドピース(処置ユニット)2と、ハンドピース2に連結される振動子ユニット3と、を備える。超音波処置装置1は、ハンドピース2及び振動子ユニット3を通る長手軸Cを有する。ここで、長手軸Cに平行な方向の一方を先端方向(図2の矢印C1の方向)とし、先端方向とは反対方向を基端方向(図2の矢印C2の方向)とする。また、先端方向及び基端方向が長手軸Cに平行な軸平行方向となる。振動子ユニット3は、基端方向側からハンドピース2に連結される。ハンドピース2は、超音波振動を用いて生体組織等の処置対象を凝固と同時に切開する超音波凝固切開処置具である。
なお、第1の実施形態では、腹位置(基準腹位置)A2から超音波振動の半波長だけ基端方向へ離れた位置に、棒状部材45の基端(振動体ユニット10の基端)が位置するが、これに限るものではない。例えば、第1の実施形態の第1の変形例として図6に示すように、腹位置(基準腹位置)A2から共振周波数Frでの超音波振動の一波長(半波長の2倍)に等しい延設寸法L2だけ基端方向へ離れた位置に、棒状部材45の基端(振動体ユニット10の基端)が位置してもよい。本変形例の振動体ユニット10は、腹位置(例えばA1~A4)及び節位置(例えばN1~N3)を有する共振周波数Frで振動する。
次に、本発明の第2の実施形態について図7を参照して説明する。第2の実施形態は、第1の実施形態の構成を次の通り変形したものである。なお、第1の実施形態と同一の部分については同一の符号を付して、その説明は省略する。
図8は、比較例、第1の実施形態及び第2の実施形態での超音波プローブ7(7´)のヤング率Eaと振動体ユニット10(10´)の共振周波数Frとの関係を示す図である。図8に示すように、振動発生ユニット30(30´)に接続される超音波プローブ7(7´)のヤング率Eaは、最大値Eamaxと最小値Eaminとの間で、バラツキが発生する。比較例では、振動体ユニット10´の共振周波数Frは、最大値Fr1maxと最小値Fr1minとの間で、バラツキが発生する。これに対し、第1の実施形態では、振動体ユニット10の共振周波数Frは、最大値Fr2maxと最小値Fr2minとの間でバラツキが発生し、比較例に比べて振動体ユニット10(10´)の共振周波数Frのバラツキが、小さくさる。さらに、第2の実施形態では、振動体ユニット10の共振周波数Frは、最大値Fr3maxと最小値Fr3minとの間でバラツキが発生し、第1の実施形態に比べて振動体ユニット10の共振周波数Frのバラツキが、さらに小さくさる。
次に、本発明の第3の実施形態について図9及び図10を参照して説明する。第3の実施形態は、第1の実施形態の構成を次の通り変形したものである。なお、第1の実施形態と同一の部分については同一の符号を付して、その説明は省略する。
なお、前述の実施形態及び変形例では、振動発生ユニット30に超音波振動子31が1つのみ設けられているが、これに限るものではない。例えば、前述の実施形態のある変形例として図11に示すように、複数(本変形例では2つ)の超音波振動子31A,31Bが振動発生ユニット30に設けられてもよい。超音波振動子31A,31Bは、長手軸Cに平行な軸平行方向について、互いに対して離れて位置している。本変形例では、腹位置A3が、最基端腹位置となる。また、超音波振動子31Bが、超音波振動(例えば31A,31B)の中で最も基端方向側に位置する最基端振動子となる。腹位置A2は、超音波振動子(最基端振動子)31Bより基端方向側に位置している。そして、腹位置(基準腹位置)A2が、超音波振動子(最基端振動子)31Bより基端方向側に位置する超音波振動の腹位置(例えばA2,A3)の中で超音波振動子31Bに最も近い腹位置となる。
Claims (9)
- 先端部に処置部が設けられる先端側振動伝達部が先端方向側に接続され、前記先端側振動伝達部に伝達される超音波振動を発生する振動発生ユニットであって、
電流が供給されることにより前記超音波振動を発生する超音波振動子と、
前記超音波振動子が装着される振動子装着部と、
前記振動子装着部の基端方向側に長手軸に沿って延設され、前記超音波振動子で発生した前記超音波振動が前記先端方向から前記基端方向へ伝達される基端側振動伝達部であって、前記超音波振動子より前記基端方向側に位置する前記超音波振動の腹位置の中で前記超音波振動子に最も近い腹位置を基準腹位置とした場合に、前記超音波振動の半波長の整数倍に等しい延設寸法だけ前記基準腹位置から前記基端方向へ離れた位置に、基端が位置する基端側振動伝達部と、
前記長手軸に平行な軸平行方向について前記基端側振動伝達部の前記基端と前記基準腹位置との間に設けられ、前記基端側振動伝達部において前記基端方向へ伝達される前記超音波振動の振幅を拡大する振幅拡大部と、
を具備する振動発生ユニット。 - 前記基端側振動伝達部は、前記振幅拡大部から前記先端方向へ延設される第1の伝達領域と、前記振幅拡大部から前記基端方向へ延設される第2の伝達領域と、を備え、
前記振幅拡大部は、前記軸平行方向について前記第1の伝達領域と前記第2の伝達領域との間に設けられ、前記第2の伝達領域での前記長手軸に垂直な前記基端側振動伝達部の断面積を前記第1の伝達領域に比べて減少させる断面積減少部であって、前記超音波振動の腹位置とは異なる位置に位置する断面積減少部を備える、
請求項1の振動発生ユニット。 - 前記断面積減少部は、前記基準腹位置より前記基端方向側に位置する前記超音波振動の節位置の中で最も前記基準腹位置に近い節位置に位置している、請求項2の振動発生ユニット。
- 前記基端側振動伝達部は、
前記振幅拡大部より前記基端方向側に設けられる第1の延設領域と、
前記第1の延設領域より前記基端方向側に設けられる第2の延設領域と、
前記軸平行方向について前記第1の延設領域と前記第2の延設領域との間に設けられ、前記第2の延設領域での前記長手軸に垂直な前記基端側振動伝達部の断面積を前記第1の延設領域に比べて拡大させる断面積拡大部であって、前記軸平行方向について前記振幅拡大部と前記基端側振動伝達部の前記基端との間に位置する前記超音波振動の前記腹位置の1つである断面変化腹位置に位置する断面積拡大部と、
を備える、請求項1の振動発生ユニット。 - 前記断面変化腹位置は、前記振幅拡大部より前記基端方向側に位置する前記超音波振動の腹位置の中で最も前記振幅拡大部に近い、請求項4の振動発生ユニット。
- 前記超音波振動子は、前記軸平行方向について互いに対して離れて位置する複数の超音波振動子であり、
前記超音波振動子の中で最も前記基端方向側に位置する超音波振動子を最基端振動子とした場合に、前記基準腹位置は、前記最基端振動子より前記基端方向側に位置する前記超音波振動の腹位置の中で前記最基端振動子に最も近い腹位置である、
請求項1の振動発生ユニット。 - 請求項1の振動発生ユニットと、
前記振動発生ユニットの前記先端方向側に前記長手軸に沿って延設され、前記超音波振動を前記基端方向から前記先端方向へ伝達する前記先端側振動伝達部であって、前記超音波振動が伝達される前記処置部を前記先端部に備える前記先端側振動伝達部と、
を具備する振動体ユニット。 - 請求項7の振動体ユニットと、
前記超音波振動子に前記電流を供給する電流供給部を備える電源ユニットと、
を具備する超音波処置装置。 - 前記振動発生ユニットは、前記振動発生ユニットの前記超音波振動による振動特性を記憶した記憶部を備え、
前記電源ユニットは、前記記憶部に記憶された前記振動発生ユニットの前記振動特性に基づいて前記電流供給部からの前記電流の供給状態を制御し、前記振動発生ユニットの前記振動特性に基づいて前記振動発生ユニットに前記先端側振動伝達部が接続された前記振動体ユニットの共振周波数を測定する供給制御部を備える、
請求項8の超音波処置装置。
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