WO2018061199A1

WO2018061199A1 - Ultrasonic transducer and method for producing ultrasonic transducer

Info

Publication number: WO2018061199A1
Application number: PCT/JP2016/079115
Authority: WO
Inventors: 之彦島村; 英人吉嶺; 雅也戸田
Original assignee: オリンパス株式会社
Priority date: 2016-09-30
Filing date: 2016-09-30
Publication date: 2018-04-05

Abstract

An ultrasonic transducer provided with a drive unit attached to the outer circumference of a bolt in a state of being sandwiched between a block on the front-end side and a block on the base-end side in a direction along the longitudinal axis, the drive unit being provided with a piezoelectric element that generates ultrasonic vibration by being supplied with electric energy. A single unit of the ultrasonic transducer is caused to vibrate with a prescribed resonant frequency by a pressing force from the front-end-side block to the base-end-side block and/or the shape of a block extension part of the base-end-side block that is extended from the base end of the bolt to the base-end side.

Description

Ultrasonic transducer and method of manufacturing ultrasonic transducer

The present invention relates to an ultrasonic transducer including a piezoelectric element that generates ultrasonic vibration when supplied with electric energy, and a method for manufacturing the ultrasonic transducer.

US2009 / 275864A1 discloses an ultrasonic treatment tool for treating a treatment target using ultrasonic vibration. This ultrasonic treatment instrument is provided with an ultrasonic transducer including a piezoelectric element that generates ultrasonic vibration when supplied with electrical energy. In this ultrasonic transducer, the tip of the bolt is connected to the tip side block, and the bolt and the tip side block are integrally formed. A drive unit including a piezoelectric element is attached to the outer periphery of the bolt. The base end portion of the bolt is connected to the base end side block, and the base end side block is fastened to the outer periphery of the bolt. The drive unit is sandwiched between the distal end side block and the proximal end side block, and a pressing force toward the distal end side acts on the drive unit from the proximal end side block. In the ultrasonic treatment instrument, a rod member including a treatment portion is connected to the distal end side of the ultrasonic transducer. The ultrasonic vibration generated by the piezoelectric element is transmitted to the treatment portion through the rod member.

In an ultrasonic treatment instrument such as US2009 / 275864A1, from the viewpoint of treatment performance and the like, a vibrating body including an ultrasonic transducer and a rod member is brought close to a predetermined resonance frequency as much as possible by ultrasonic vibration at a predetermined resonance frequency. And is required to vibrate. In addition, when a vibrating body including an ultrasonic transducer and a rod member is vibrated at a predetermined resonance frequency, in order to reduce energy loss, the ultrasonic transducer itself can be vibrated at a predetermined resonance frequency by ultrasonic vibration generated by a piezoelectric element. Alternatively, it is required to vibrate as close to a predetermined resonance frequency as possible. Therefore, a single element (minimum constituent unit of the ultrasonic transducer and a half wavelength of vibration) corresponding to each physical property of the components forming the ultrasonic transducer such as the piezoelectric element, the distal end side block, and the proximal end side block. It is necessary to form an ultrasonic transducer that vibrates at a predetermined resonance frequency even in an assembly of a natural number multiple).

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an ultrasonic transducer that vibrates at a predetermined resonance frequency alone or a method for manufacturing the ultrasonic transducer.

In order to achieve the above object, a method of manufacturing an ultrasonic transducer according to an aspect of the present invention is characterized in that an electrical energy is supplied to an outer periphery of a bolt extending along a longitudinal axis from a proximal end to a distal end. A drive unit including a piezoelectric element that generates a sonic vibration is attached; a distal end block to which a distal end portion of the bolt is connected in a direction along the longitudinal axis; and a proximal end block to which a proximal end portion of the bolt is connected The driving unit is sandwiched between the bolt and the driving unit to apply a pressing force to the driving unit from the base end side block, and the ultrasonic vibration generated in the piezoelectric element causes the bolt and the tip The ultrasonic transducer including the side block, the base end side block, and the drive unit vibrates at a predetermined resonance frequency. Comprising and adjusting the pressing force from the side blocks to the drive unit.

An aspect of the present invention includes a bolt having a proximal end and a distal end and extending along the longitudinal axis from the proximal end to the distal end, a distal end side block to which the distal end portion of the bolt is connected, and a base of the bolt A proximal block to which an end portion is connected; and a piezoelectric element that generates ultrasonic vibrations when electric energy is supplied; and the distal block and the proximal block in a direction along the longitudinal axis And a drive unit attached to the outer periphery of the bolt in a state of being sandwiched between the base end block and the base end block from the base end of the bolt to the base end of the base end block A block extending portion extending toward the base end, and the shape of the block extending portion is determined by the ultrasonic transducer generated by the ultrasonic vibration generated by the piezoelectric element. The ultrasonic transducer including the bolt, the distal end side block, the proximal end side block, and the drive unit is affected by the resonance frequency in the state where the vibration is generated. Due to the shape of the block extending portion, it vibrates at a predetermined resonance frequency.

According to another aspect of the present invention, there is provided a method of manufacturing an ultrasonic transducer including a piezoelectric element that generates ultrasonic vibrations when electric energy is supplied to an outer periphery of a bolt extending along a longitudinal axis from a proximal end to a distal end. The base of the bolt in a state where a block extending portion extends from the base end of the bolt to the base end of the base end side block toward the base end side in the base end side block. Connecting the end to the proximal block, and sandwiching the drive unit between the proximal block to which the distal end of the bolt is connected in the direction along the longitudinal axis and the proximal block An ultrasonic transducer including the bolt, the distal end side block, the proximal end side block, and the drive unit by the ultrasonic vibration generated in the piezoelectric element. The state body to vibrate at a predetermined resonance frequency, and a adjusting the shape of the block extending portion.

FIG. 1 is a schematic view showing a treatment system in which the ultrasonic transducer according to the first embodiment is used. FIG. 2 is a cross-sectional view schematically showing the configuration of the ultrasonic transducer according to the first embodiment. FIG. 3 is a schematic diagram showing an example of the relationship between the pressing force from the proximal block to the drive unit and the resonance frequency of the ultrasonic transducer. FIG. 4 is a side view schematically showing the configuration of the ultrasonic transducer according to the second embodiment. FIG. 5 is a cross-sectional view schematically showing the configuration of the ultrasonic transducer according to the second embodiment. FIG. 6 is a schematic diagram illustrating an example of the relationship between the second cross-sectional area of the block extending portion and the resonance frequency of the ultrasonic transducer in the second extending region. FIG. 7 is a schematic diagram illustrating an example of the relationship between the dimension in the direction along the longitudinal axis of the second extending region in the block extending portion and the resonance frequency of the ultrasonic transducer. FIG. 8 is a cross-sectional view schematically showing a configuration of an ultrasonic transducer according to a second modification of the second embodiment. FIG. 9 is a cross-sectional view schematically showing a configuration of an ultrasonic transducer according to a third modification of the second embodiment. FIG. 10 is a schematic diagram illustrating an example of the relationship between the hole area of the hole formed in the block extending portion and the resonance frequency of the ultrasonic transducer. FIG. 11 is a side view schematically showing a configuration of an ultrasonic transducer according to a modification of the first embodiment and the second embodiment.

(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a diagram showing a treatment system 1 in which the ultrasonic transducer 20 of the present embodiment is used. As shown in FIG. 1, the treatment system 1 includes an ultrasonic treatment tool 2 and an energy control device 3. The ultrasonic treatment instrument 2 includes a housing 5 that can be held, and a shaft 6 that is attached to the housing 5. The shaft 6 extends substantially straight. Here, in the ultrasonic treatment instrument 2, the side on which the housing 5 is positioned with respect to the shaft 6 is a base end side (arrow C1 side), and the side opposite to the base end side is a front end side (arrow C2 side). For this reason, the shaft 6 is attached to the housing 5 from the front end side. In the ultrasonic treatment instrument 2, an end effector 7 is provided at a position on the distal end side with respect to the shaft 6.

A handle 8 is rotatably attached to the housing 5. When the handle 8 rotates with respect to the housing 5, the handle 8 opens or closes with respect to the housing 5. A rod member (probe) 10 is inserted through the shaft 6. The rod member 10 is formed from a material having high vibration transmission properties such as a titanium alloy. The rod member 10 extends from the inside of the housing 5 to the front end side through the inside of the shaft 6. The rod member 10 includes a rod protrusion 11 that protrudes from the tip of the shaft 6 toward the tip. A jaw 12 is rotatably attached to the tip of the shaft 6. The jaw 12 and the handle 8 are connected via a movable member (not shown) that extends through the inside of the shaft 6. By opening or closing the handle 8 with respect to the housing 5, the movable member moves to the proximal end side or the distal end side. As a result, the jaw 12 rotates with respect to the shaft 6, and the gap between the jaw 12 and the rod protrusion 11 opens or closes. In the present embodiment, the end effector 7 is formed by the rod protrusion 11 and the jaw 12. Then, the treatment target is treated by gripping the treatment target such as a living tissue between the jaw 12 and the rod protrusion 11.

In an embodiment, a rotation knob (not shown) that is a rotation operation member is attached to the housing 5, and the rotation knob can rotate with respect to the housing 5 around the axis of the shaft 6. In this case, by rotating the rotary knob, the shaft 6, the end effector 7, and the rod member 10 rotate together with respect to the housing 5 around the axis of the central axis of the shaft 6. In some embodiments, the jaw 12 is not provided, and the end effector 7 is formed only from the rod protrusion 11. In this case, the handle 8 and the movable member described above are not provided. In this case, the rod protrusion 11 has a hook shape, a spatula shape, a blade shape, or the like.

The ultrasonic transducer 20 is connected to the rod member 10 from the base end side inside the housing 5. In the present embodiment, the ultrasonic transducer 20 is accommodated in the transducer case 18 and supported by the transducer case 18. The ultrasonic transducer 20 is connected to the rod member 10 by attaching the transducer case 18 to the housing 5 from the proximal end side. In the present embodiment, the distal end of the ultrasonic transducer 20 is directly connected to the proximal end of the rod member 10. In the present embodiment, one end of the cable 13 is connected to the transducer case 18. The other end of the cable 13 is detachably connected to the energy control device 3.

In some embodiments, the transducer case 18 is not provided. In this case, the ultrasonic transducer 20 is supported by the housing 5, and one end of the cable 13 is connected to the housing 5. In the embodiment in which the rotation knob is provided, the ultrasonic transducer 20 is rotated around the central axis of the shaft 6 together with the shaft 6, the end effector 7 and the rod member 10 by rotating the rotation knob. Rotates relative to the housing 5.

FIG. 2 is a diagram showing the configuration of the ultrasonic transducer 20. As shown in FIG. 2, the ultrasonic transducer 20 includes a bolt (shaft) 21 having a longitudinal axis C as a central axis. Here, one side in the direction along the longitudinal axis C coincides with the base end side (arrow C1 side), and the other side in the direction along the longitudinal axis C coincides with the distal end side (arrow C2 side). The bolt 21 extends substantially straight along the longitudinal axis C from the proximal end to the distal end.

1 and 2, in the ultrasonic transducer 20, the tip of the bolt 21 is connected to the tip side block (front mass) 22. In the present embodiment, the front end side block 22 is integral with the bolt 21. The front end side block 22 and the bolt 21 are made of, for example, a titanium alloy, an aluminum alloy, SUS, or the like. The tip side block 22 may be formed of the same material as the bolt 21 or may be formed of a material different from the bolt 21. Further, the distal end side block 22 forms the distal end of the ultrasonic transducer 20 and is connected to the rod member 10. In the present embodiment, a supported portion 25 such as a flange supported by the transducer case 18 or the housing 5 is formed on the distal end side block 22, and the horn whose cross-sectional area substantially perpendicular to the longitudinal axis C decreases toward the distal end side. 26 is formed.

In the ultrasonic transducer 20, the base end portion of the bolt 21 is connected to the base end side block (back mass) 23. In the present embodiment, the base end side block 23 is formed in a ring shape that covers the outer periphery of the bolt 21. On the outer periphery of the base end portion of the bolt 21, a male screw portion 27 is formed as a first engagement portion. A female thread portion 28 is formed on the inner periphery of the base end side block 23 as a second engagement portion that engages with the first engagement portion. In the present embodiment, the male screw portion 27 extends from the proximal end of the bolt 21 toward the distal end side, and the female screw portion 28 extends from the proximal end of the proximal end side block 23 toward the distal end side. . The base end side block 23 is fastened to the outer periphery of the bolt 21 by engaging the female screw portion 28 with the male screw portion 27, that is, by screwing. Therefore, in this embodiment, the base end side block 23 is a fastening member fastened to the outer periphery of the bolt 21.

The base end side block 23 is made of, for example, a titanium alloy, an aluminum alloy, SUS, or the like. Here, the proximal side block 23 may be formed from the same material as the distal side block 22, or may be formed from a material different from the distal side block 22. In the present embodiment, the base end of the base end side block 23 is substantially coincident with the base end of the bolt 21 in the direction along the longitudinal axis C, and the base end of the base end side block 23 and the base end of the bolt 21 are the same. Thus, the base end of the ultrasonic transducer 20 is formed.

The drive unit 30 is attached to the outer periphery of the bolt 21. The drive unit 30 is sandwiched between the distal end side block 22 and the proximal end side block 23 in the direction along the longitudinal axis C. Then, the drive unit 30 is pressed toward the distal end side by the proximal end side block 23. The drive unit 30 includes ten piezoelectric elements 31 in this embodiment. The piezoelectric element 31 is formed of a material having a material (physical property value) such as a rigidity that is different from that of the bolt 21 such as ceramics. The piezoelectric element 31 converts electrical energy into vibration energy. Each of the piezoelectric elements 31 is formed in a ring shape, and the bolt 21 is inserted through each of the piezoelectric elements 31. Note that at least one piezoelectric element 31 may be provided.

The drive unit 30 includes

electrode members

32 and 33 formed of a conductive material such as metal. The electrode member 32 includes six electrode ring portions 35 in the present embodiment, and the electrode member 33 includes five electrode ring portions 36 in the present embodiment. The bolt 21 is inserted through each of the electrode ring portions 35 and each of the electrode ring portions 36. Each of the piezoelectric elements 31 is sandwiched between a corresponding one of the electrode ring portions 35 and a corresponding one of the electrode ring portions 36 in the direction along the longitudinal axis C. One end of an electrical wiring 37 is connected to the electrode member 32. In addition, one end of an electrical wiring 38 is connected to the electrode member 33. Note that the number of

electrode ring portions

35 and 36 is determined in accordance with the number of piezoelectric elements 31, and in each case, each piezoelectric element 31 corresponds to one corresponding electrode ring portion 35 and the electrode ring portion 36. It becomes the structure pinched | interposed between one to do. Since the ultrasonic transducer 20 is formed as described above, in the present embodiment, the ultrasonic transducer 20 is a bolt-clamped Langevin-type transducer.

The energy control device 3 includes an energy output source 15, a processor 16, and a storage medium 17. The

electric wires

37 and 38 are extended through the inside of the cable 13, and the other ends of the

electric wires

37 and 38 are connected to the energy output source 15. The energy output source 15 includes a conversion circuit that converts electric power from a power source or the like with a battery power source or an outlet into electric energy supplied to the drive unit 30 of the ultrasonic transducer 20, and outputs the converted electric energy. The electrical energy output from the energy output source 15 is supplied to the drive unit 30 via the

electrical wirings

37 and 38. The energy output source 15 outputs AC power as electric energy to the drive unit 30.

The processor 16 as a control unit is formed of an integrated circuit including a CPU (Central Processing Unit), an ASIC (Application Specific Integrated Circuit), or an FPGA (Field Programmable Gate Array). The processing in the processor 16 is performed according to a program stored in the processor 16 or the storage medium 17. In addition, the storage medium 17 stores a processing program used by the processor 16, parameters and tables used in calculation by the processor 16, and the like. The processor 16 controls the output of electrical energy from the energy output source 15 to the drive unit 30. In this embodiment, the processor 16 adjusts the frequency in the output of the electrical energy from the energy output source 15 to a predetermined frequency. In one embodiment, the default frequency is 47 kHz.

When electric energy is supplied from the energy output source 15 to the drive unit 30, a voltage is applied between the

electrode members

32 and 33, and a voltage is applied to each of the piezoelectric elements 31. Thereby, each of the piezoelectric elements 31 converts electrical energy into vibration energy, and ultrasonic vibration is generated in the piezoelectric elements 31. The generated ultrasonic vibration is transmitted to the rod member 10, and is transmitted from the proximal end side to the distal end side of the rod member 10 to the rod protruding portion 11. The end effector 7 treats a treatment target such as a biological tissue using the ultrasonic vibration transmitted to the rod protrusion 11. In a state where ultrasonic vibration is transmitted in the ultrasonic transducer 20 and the rod member 10, the vibrator including the ultrasonic transducer 20 and the rod member 10 vibrates at a predetermined resonance frequency Frref. Therefore, in the ultrasonic transducer 20, the bolt 21, the distal end side block 22, the proximal end side block 23, and the drive unit 30 vibrate together by ultrasonic vibration generated by the piezoelectric element 31. At this time, the vibrating body performs longitudinal vibration whose vibration direction is substantially parallel to the longitudinal axis C. The predetermined resonance frequency Frref can be set as appropriate. In one embodiment, the predetermined resonance frequency Frref is 47 kHz.

In the state where the vibrating body vibrates at the predetermined resonance frequency Frref, one of the vibration antinodes is generated at the tip of the vibrating body, that is, the tip of the rod member 10. Then, a vibration antinode A1, which is one of the vibration antinodes, is generated at the base end of the vibrator, that is, the base end of the ultrasonic transducer 20. The vibration antinode A1 is located on the most proximal side in the vibration antinode. Further, in the present embodiment, a vibration antinode A2 that is half a wavelength away from the vibration antinode A1 toward the tip side is generated in the tip side block 22. Then, a vibration antinode A3 that is one wavelength away from the vibration antinode A1 toward the tip side is generated at the tip of the tip block 22, that is, the tip of the ultrasonic transducer 20. Therefore, in the present embodiment, the space between the distal end and the proximal end of the ultrasonic transducer 20 corresponds to one wavelength of longitudinal vibration at a predetermined resonance frequency Frref. For this reason, even the single ultrasonic transducer 20 vibrates at the predetermined resonance frequency Frref due to the ultrasonic vibration generated in the piezoelectric element 31. In the present embodiment, in a state where the vibrating body vibrates at a predetermined resonance frequency Frref, a vibration node N1 that is a quarter wavelength away from the vibration antinode A1 toward the tip side is generated in the drive unit 30 and the bolt 21. Then, a vibration node N2 that is 3/4 wavelength away from the vibration antinode A1 toward the distal end side is generated in the supported portion 25 of the distal end side block 22.

The single unit of the ultrasonic transducer 20 described above is a minimum structural unit of the ultrasonic transducer 20 and is an assembly of the bolt 21, the distal end side block 22, the proximal end side block 23, and the drive unit 30. The single length of the ultrasonic transducer 20 is a natural number multiple of the half wavelength of the longitudinal vibration at the predetermined resonance frequency Frref. The rod member 10 is connected to the distal end side of the ultrasonic transducer 20 as a separate body.

Also, the ultrasonic transducer 20 has a dimension L1 from the proximal end to the distal end in the longitudinal direction, which is the direction along the longitudinal axis C. In the present embodiment, the dimension L1 is a predetermined size L1ref.

In some embodiments, an insulating ring (not shown) formed of an electrically insulating material is provided between the drive unit 30 and the distal block 22 and between the drive unit 30 and the proximal block 23. Not). An insulating tube (not shown) formed of an electrically insulating material is provided between the inner periphery of the drive unit 30 and the outer periphery of the bolt 21. Thereby, the supply of the electric energy supplied to the drive unit 30 to the distal end side block 22, the proximal end side block 23 and the bolt 21 is prevented. In an embodiment, electric energy different from the electric energy supplied to the drive unit 30 is output from the energy output source 15. For example, electrical energy different from the electrical energy supplied to the drive unit 30 is supplied to each of the rod protrusion 11 and the jaw 12. As a result, a high-frequency current flows through the treatment target gripped between the jaw 12 and the rod protrusion 11.

Next, the manufacturing method, operation, and effect of the ultrasonic transducer 20 of this embodiment will be described. In manufacturing the ultrasonic transducer 20, first, the drive unit 30 including the piezoelectric element 31 is attached to the outer periphery of the bolt 21. Then, the female screw portion (second engaging portion) 28 of the base end side block 23 is screwed into the male screw portion (first engaging portion) 27 of the bolt 21, and the base end side block 23 is connected to the bolt 21. Fasten to the outer periphery. As a result, the drive unit 30 is sandwiched between the distal end side block 22 and the proximal end side block 23, and a pressing force P acts on the drive unit 30 from the proximal end side block 23. At this time, in one embodiment, the base end side block 23 is connected to the bolt 21 so that the pressing force P having a predetermined magnitude Pref acts on the drive unit 30 from the base end side block 23.

When the ultrasonic transducer 20 is assembled as described above, electric energy is supplied from the energy output source 15 to the drive unit 30, and the ultrasonic transducer 20 is vibrated alone by the ultrasonic vibration generated by the piezoelectric element 31. At this time, the frequency at the output of electrical energy from the energy output source 15 is adjusted by the processor 16 to a predetermined frequency. Then, in a state where the ultrasonic transducer 20 is vibrating, the resonance frequency Fr in vibration is detected. The resonance frequency Fr is detected by, for example, a vibrometer.

Here, the resonance frequency Fr in the vibration of the ultrasonic transducer 20 alone is such as the rigidity of the members constituting the ultrasonic transducer 20 such as the bolt 21, the distal end side block 22, the proximal end side block 23, and the piezoelectric element 31. It is affected by physical properties (materials) and the shape of those members. Further, the resonance frequency Fr in the vibration of the ultrasonic transducer 20 alone is affected by the pressing force P applied from the proximal end block 23 to the drive unit 30. When the pressing force P from the base end side block 23 to the drive unit 30 is changed, for example, stress in the piezoelectric element 31 is changed, and the rigidity of the drive unit 30 including the piezoelectric element 31 is changed. When the rigidity of the drive unit 30 changes, the resonance frequency Fr of the ultrasonic transducer 20 changes. In the present embodiment, the pressing force P is adjusted based on the detection result of the resonance frequency Fr. Then, the pressing force P is adjusted so that the single unit of the ultrasonic transducer 20 vibrates at a predetermined resonance frequency Frref.

FIG. 3 is a diagram illustrating an example of the relationship between the pressing force P from the base end side block 23 to the drive unit 30 and the resonance frequency Fr of the ultrasonic transducer 20. In FIG. 3, the horizontal axis represents the pressing force P, and the vertical axis represents the resonance frequency Fr. In FIG. 3, an example of the relationship between the pressing force P and the resonance frequency Fr is indicated by a solid line, and another example of the relationship between the pressing force P and the resonance frequency Fr is indicated by a broken line. In the example of the solid line and the example of the broken line in FIG. 3, for example, a lot of members (for example, at least one of the bolt 21, the distal end side block 22, the proximal end side block 23, and the drive unit 30) constituting the single unit of the ultrasonic transducer 20 Different from each other. Here, the relationship between the pressing force P and the resonance frequency Fr corresponds to the physical properties (materials) such as the rigidity (Young's modulus) of the members constituting the ultrasonic transducer 20 and the shapes of these members. Change. However, as shown in FIG. 3, in any case, when the pressing force P increases, the resonance frequency Fr increases.

In the example of the ultrasonic transducer 20 indicated by the solid line in FIG. 3, the ultrasonic transducer 20 has a predetermined resonance frequency Frref in a state where a pressing force P having a predetermined magnitude Pref acts on the drive unit 30 from the proximal end block 23. Vibrates at a lower resonance frequency Fr1. In this case, the pressing force P is increased from the predetermined magnitude Pref to the magnitude P1 based on the detection result of the resonance frequency Fr. When the pressing force P is adjusted to the magnitude P1, the single unit of the ultrasonic transducer 20 is vibrated at the predetermined resonance frequency Frref. In the example shown by the broken line in FIG. 3, the ultrasonic transducer 20 has a resonance higher than a predetermined resonance frequency Frref in a state in which the pressing force P having a predetermined magnitude Pref acts on the drive unit 30 from the proximal block 23. It vibrates at the frequency Fr2. In this case, the pressing force P is decreased from the predetermined magnitude Pref to the magnitude P2 based on the detection result of the resonance frequency Fr. When the pressing force P is adjusted to the magnitude P2, the single unit of the ultrasonic transducer 20 is vibrated at the predetermined resonance frequency Frref. The state of oscillating at the predetermined resonance frequency Frref includes a state in which the resonance frequency Fr is slightly deviated from the predetermined resonance frequency Frref but can be regarded as being oscillated at the predetermined resonance frequency Frref.

In some embodiments, detection of the resonance frequency Fr by supplying electric energy to the drive unit 30 may not be performed. In this case, the pressing force P is adjusted based on the physical properties (materials) such as the rigidity of the members constituting the ultrasonic transducer 20 and the shapes of the members. The adjustment of the pressing force P is performed by estimating the relationship between the pressing force P and the resonance frequency Fr from the physical properties (materials) such as the rigidity of the members constituting the ultrasonic transducer 20 and the shapes of these members, for example. Based on the relationship. Also in this embodiment, the pressing force P is adjusted so that the single unit of the ultrasonic transducer 20 vibrates at the predetermined resonance frequency Frref.

As described above, in this embodiment, by adjusting the pressing force P, the ultrasonic transducer 20 alone vibrates at the predetermined resonance frequency Fr by the ultrasonic vibration generated in the piezoelectric element 31. For this reason, when the vibrating body including the ultrasonic transducer 20 and the rod member 10 is vibrated at a predetermined resonance frequency, energy loss is reduced and the vibration stability of the vibrating body is ensured. By ensuring the stability of the vibration of the vibrating body, the ultrasonic treatment tool 2 improves the treatment performance in the treatment using ultrasonic vibration.

Further, in the present embodiment, in adjusting the resonance frequency Fr to the predetermined resonance frequency Frref, only the pressing force P is adjusted, and the shape and the like of the members constituting the ultrasonic transducer 20 are not changed. For this reason, the dimension L1 from the proximal end to the distal end of the ultrasonic transducer 20 is maintained at the predetermined size L1ref. Therefore, in the ultrasonic transducer in which the pressing force P is adjusted, the dimension L1 in the direction along the longitudinal axis C from the proximal end to the distal end of the ultrasonic transducer 20 is the predetermined size L1ref. Since the dimension L1 in the longitudinal direction of the ultrasonic transducer 20 is maintained at the predetermined size L1ref, the influence of the ultrasonic transducer 20 in the product configuration of the ultrasonic treatment instrument 2 is suppressed.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS. In the second embodiment, the configuration of the first embodiment is modified as follows. In addition, the same code | symbol is attached | subjected about the part same as 1st Embodiment, and the description is abbreviate | omitted.

4 and 5 are diagrams showing the configuration of the ultrasonic transducer 20 of the present embodiment. 4 is a side view, and FIG. 5 is a cross-sectional view showing a cross section substantially parallel to the longitudinal axis C. As shown in FIG. As shown in FIGS. 4 and 5, in this embodiment as well, as in the first embodiment, the ultrasonic transducer 20 includes a bolt 21, a distal end side block 22, a proximal end side block 23, and a drive unit 30. A supported portion 25 and a horn 26 are formed on the side block 22. The drive unit 30 includes a piezoelectric element 31 and

electrode members

32 and 33. Also in this embodiment, the dimension L2 in the direction (longitudinal direction) along the longitudinal axis C from the proximal end to the distal end of the ultrasonic transducer 20 is the predetermined size L2ref. When the ultrasonic vibration is generated in the piezoelectric element 31, the ultrasonic transducer 20 vibrates at a predetermined resonance frequency Frref even when it is a single element. At this time, as in the first embodiment, vibration transducers A1 to A3 and vibration nodes N1 and N2 are generated in the ultrasonic transducer 20. Therefore, also in this embodiment, the space between the distal end and the proximal end of the ultrasonic transducer 20 corresponds to one wavelength of longitudinal vibration at a predetermined resonance frequency Frref.

In this embodiment, a block extending portion 40 extending from the base end of the bolt 21 toward the base end side is formed in the base end side block 23. The block extending portion 40 extends toward the base end side to the base end of the base end side block 23. Therefore, in this embodiment, the base end of the base end side block 23 is located on the base end side with respect to the base end of the bolt 21. In the present embodiment, the base end of the ultrasonic transducer 20 is formed by the base end of the block extending portion 40, that is, the base end of the base end side block 23. In the present embodiment, the base end block 23 is formed with a concave shape that is recessed from the tip of the base end block 23 toward the base end. A female screw part 28 is formed in the concave shape of the base end side block 23, and a base end part of the bolt 21 including the male screw part 27 is inserted. The block extending portion 40 has an extending dimension L <b> 3 in the direction along the longitudinal axis C from the base end of the bolt 21 to the base end of the base end side block 23. The extension dimension L3 of the block extending portion 40 is a predetermined size L3ref.

The block extending portion 40 includes a first extending region 41 and a second extending region 42. In the first extending region 41, the cross-sectional area perpendicular to the longitudinal axis C becomes the first cross-sectional area Sa. Further, in the second extending region 42, the cross-sectional area perpendicular to the longitudinal axis C becomes the second cross-sectional area Sb smaller than the first cross-sectional area Sa. The second extending region 42 extends to a portion different from the first extending region 41 in the direction along the longitudinal axis C, and is adjacent to the proximal end side of the first extending region 41 in the present embodiment. Is done. In the present embodiment, the second extension region 42 extends to the base end of the base end side block 23. The second extending region 42 has a dimension T in the direction along the longitudinal axis C.

In the first extending region 41, the range surrounded by the outer periphery of the proximal block 23 in the cross section perpendicular to the longitudinal axis C is the first range area Aa. Further, in the second extending region 42, the range surrounded by the outer periphery in the cross section perpendicular to the longitudinal axis C is the second range area Ab smaller than the first range area Aa. In one embodiment, the outer diameter of the base end side block 23 in the second extension region 42 is made smaller than the outer diameter of the base end side block 23 in the first extension region 41, and the first extension region 41. The second range area Ab in the second extension region 42 is made smaller than the first range area Aa in the installation region 41. In another embodiment, a plane having a smaller distance from the longitudinal axis C than the outer radius of the proximal end block 23 in the first extending region 41 is formed on the outer periphery of the second extending region 42. The second range area Ab in the second extension region 42 is made smaller than the first range area Aa in the first extension region 41 due to the formation. In the present embodiment, since the second range area Ab in the second extension region 42 is smaller than the first range area Aa in the first extension region 41, the first extension region 41 The second cross-sectional area Sb in the second extended region 42 is smaller than the first cross-sectional area Sa. As described above, by forming the outer periphery of the first extension region 41 and the outer periphery of the second extension region 42, the first extension region 41 and the second extension region 40 are formed on the outer periphery of the block extending portion 40. A step 43 is formed at the boundary with the extended region 42.

Next, the manufacturing method, operation, and effect of the ultrasonic transducer 20 of this embodiment will be described. Also in this embodiment, in the manufacture of the ultrasonic transducer 20, the drive unit 30 including the piezoelectric element 31 is attached to the outer periphery of the bolt 21, and the proximal end block 23 is fastened to the outer periphery of the bolt 21. As a result, the drive unit 30 is sandwiched between the distal end side block 22 and the proximal end side block 23, and a pressing force P acts on the drive unit 30 from the proximal end side block 23. In the present embodiment, the base end portion of the bolt 21 in a state in which the block extending portion 40 extends from the base end of the bolt 21 to the base end of the base end side block 23 in the base end side block 23 toward the base end side. Is connected to the proximal block 23. Further, the extension dimension L3 of the block extending portion 40 in the direction along the longitudinal axis C from the base end of the bolt 21 to the base end of the base end side block 23 is set to a predetermined size L3ref. Thereby, in the ultrasonic transducer 20 in which the extension dimension L3 of the block extending portion 40 is the predetermined size L3ref, the dimension L2 in the direction along the longitudinal axis C from the proximal end to the distal end of the ultrasonic transducer 20 is It becomes a predetermined size L2ref. In one embodiment, the proximal block 23 is connected to the bolt 21 so that the pressing force P having a predetermined magnitude Pref acts on the drive unit 30 from the proximal block 23.

When the ultrasonic transducer 20 is assembled as described above, in the present embodiment, the second cross-sectional area Sb in the second extending region 42 is brought into a state where the single unit of the ultrasonic transducer 20 vibrates at the predetermined resonance frequency Frref. Adjust. Here, as described above in the first embodiment, the resonance frequency Fr in the vibration of the ultrasonic transducer 20 alone is a physical property (material) such as the rigidity (Young's modulus) of the members constituting the ultrasonic transducer 20. And the influence of the shape of those members. Therefore, the second cross-sectional area Sb in the second extending region 42 and the shape of the block extending portion 40 that is a part of the proximal-side block 23 are the resonance frequency in the vibration of the ultrasonic transducer 20 alone. Affects Fr. Therefore, when the second cross-sectional area Sb is changed by adjusting the second cross-sectional area Sb in the second extending region 42, the shape of the block extending portion 40 and the shape of the base end side block 23 are changed. The rigidity and mass of the base end side block 23 change. The resonance frequency Fr in the vibration of the ultrasonic transducer 20 changes due to changes in rigidity, mass, and the like of the proximal end block 23.

In an example, as described above in the first embodiment, the ultrasonic transducer 20 is vibrated alone, and the resonance frequency Fr in the vibration is detected by a vibration meter or the like. Then, based on the detected resonance frequency Fr, the second cross-sectional area Sb is adjusted so that the single unit of the ultrasonic transducer 20 vibrates at the predetermined resonance frequency Frref. In another embodiment, the relationship between the second cross-sectional area Sb and the resonance frequency Fr is estimated from the physical properties (materials) such as the rigidity of the members constituting the ultrasonic transducer 20 and the shapes of the members. To do. Then, based on the relationship between the estimated second cross-sectional area Sb and the resonance frequency Fr, the second cross-sectional area Sb is adjusted so that the single unit of the ultrasonic transducer 20 vibrates at the predetermined resonance frequency Frref.

FIG. 6 is a diagram illustrating an example of the relationship between the second cross-sectional area Sb of the block extending portion 40 in the second extending region 42 and the resonance frequency Fr of the ultrasonic transducer 20. In FIG. 6, the horizontal axis indicates the second cross-sectional area Sb, and the vertical axis indicates the resonance frequency Fr. Here, the relationship between the second cross-sectional area Sb and the resonance frequency Fr changes corresponding to the physical properties (materials) such as the rigidity of the members constituting the ultrasonic transducer 20 and the shapes of the members. To do. However, in either case, as shown in FIG. 6, when the second cross-sectional area Sb increases, the resonance frequency Fr decreases.

In the example shown in FIG. 6, the ultrasonic transducer 20 vibrates at a resonance frequency Fr3 lower than the predetermined resonance frequency Frref in a state where the second cross-sectional area Sb becomes the size Sb1. In this case, based on the detection result of the resonance frequency Fr or the relationship between the estimated second cross-sectional area Sb and the resonance frequency Fr, the outer diameter of the block extending portion 40 is reduced in the second extending region 42, The second cross-sectional area Sb is decreased from the size Sb1 to the size Sb2. By adjusting the second cross-sectional area Sb to the size Sb2, the single unit of the ultrasonic transducer 20 is vibrated at the predetermined resonance frequency Frref.

As described above, in the present embodiment, the ultrasonic transducer 20 alone is adjusted by adjusting the second cross-sectional area Sb in the second extending region 42 of the block extending portion 40 and adjusting the shape of the block extending portion 40. However, it vibrates at a predetermined resonance frequency Fr by the ultrasonic vibration generated in the piezoelectric element 31. For this reason, as in the first embodiment, when the vibrating body including the ultrasonic transducer 20 and the rod member 10 is vibrated at a predetermined resonance frequency, energy loss is reduced and the vibration stability of the vibrating body is ensured. Is done.

In the present embodiment, in the adjustment of the resonance frequency Fr to the predetermined resonance frequency Frref, only the adjustment of the second cross-sectional area Sb is performed, and the extending dimension in the direction along the longitudinal axis C of the block extending portion 40 is performed. L3 is not changed from the default size L3ref. Therefore, in the adjustment of the second sectional area Sb, that is, the adjustment of the shape of the block extending portion 40, the dimension L2 in the direction along the longitudinal axis C from the proximal end to the distal end of the ultrasonic transducer 20 is a predetermined size. Maintained at L2ref. Since the dimension L2 in the longitudinal direction of the ultrasonic transducer 20 is maintained at the predetermined size L2ref, the influence of the ultrasonic transducer 20 in the product configuration of the ultrasonic treatment instrument 2 can be suppressed as in the first embodiment. .

(Modification of the second embodiment)
In the first modification of the second embodiment, by adjusting the dimension T in the direction along the longitudinal axis C of the second extending region 42, the resonance frequency Fr of the ultrasonic transducer 20 alone is set. adjust. As the dimension T changes, the proportion of the portion that becomes the second cross-sectional area Sb in the block extending portion 40 changes. Thereby, the shape of the block extension part 40 and the shape of the base end side block 23 change, and the rigidity, mass, etc. of the base end side block 23 change. As described above, the resonance frequency Fr in the vibration of the ultrasonic transducer 20 changes as the rigidity and mass of the proximal end block 23 change. Accordingly, the dimension T in the direction along the longitudinal axis C of the second extending region 42 affects the resonance frequency Fr. Also in this modification, the dimension T of the second extending region 42 is adjusted so that the single unit of the ultrasonic transducer 20 vibrates at the predetermined resonance frequency Frref. In one embodiment, as described above, the resonance frequency Fr is detected by a vibration meter or the like, and the dimension T is adjusted based on the detection result of the resonance frequency Fr. In another embodiment, the relationship between the dimension T and the resonance frequency Fr is estimated from the physical properties (materials) such as the rigidity of the members constituting the ultrasonic transducer 20 and the shape of the members. The dimension T is adjusted based on

FIG. 7 is a diagram showing an example of the relationship between the dimension T in the direction along the longitudinal axis C of the second extending region 42 and the resonance frequency Fr of the ultrasonic transducer 20. In FIG. 7, the horizontal axis indicates the dimension T, and the vertical axis indicates the resonance frequency Fr. Here, the relationship between the dimension T and the resonance frequency Fr changes in accordance with physical properties (materials) such as the rigidity of the members constituting the ultrasonic transducer 20 and the shapes of the members. However, in any case, as shown in FIG. 7, when the second dimension T increases, the resonance frequency Fr increases.

In the example shown in FIG. 7, the ultrasonic transducer 20 vibrates at a resonance frequency Fr4 lower than a predetermined resonance frequency Frref in a state where the dimension T becomes the size T1. In this case, the dimension T is increased from the magnitude T1 to the magnitude T2 based on the detection result of the resonance frequency Fr or the relationship between the estimated dimension T and the resonance frequency Fr. By adjusting the dimension T to the size T2, the single unit of the ultrasonic transducer 20 is in a state of vibrating at the predetermined resonance frequency Frref.

Further, in the second modification of the second embodiment shown in FIG. 8, in the block extending portion 40, the first extending region 41 is formed solid, whereas the second extending region 42 is It is formed hollow. In this modification, the second extending region 42 is formed hollow by the hole 45 extending along the longitudinal axis C. The hole 45 extends from the proximal end of the proximal end side block 23 toward the distal end side. Also in this modified example, in the first extending region 41, the cross-sectional area perpendicular to the longitudinal axis C is the first cross-sectional area Sa, and in the second extending region 42, the cross-sectional area perpendicular to the longitudinal axis C is The second sectional area Sb is smaller than the first sectional area Sa.

In an embodiment of this modification, the size of the second cross-sectional area Sb in the second extending region 42 is adjusted by adjusting the diameter of the hole 45, and the resonance of the ultrasonic transducer 20 as a single unit is adjusted. The frequency Fr is adjusted. In another embodiment, by adjusting the extension dimension of the hole 45, the dimension T along the longitudinal axis C of the second extension region 42 is adjusted, and the resonance of the ultrasonic transducer 20 as a single unit is adjusted. The frequency Fr is adjusted. Also in this modification, the second cross-sectional area Sb or the dimension T is adjusted so that the single unit of the ultrasonic transducer 20 vibrates at the predetermined resonance frequency Frref.

In a modification, the ultrasonic transducer is adjusted by adjusting both the second cross-sectional area Sb in the second extending region 42 and the dimension T along the longitudinal axis C of the second extending region 42. The resonance frequency Fr of the single unit 20 is adjusted. Also in this modification, the second cross-sectional area Sb and the dimension T are adjusted so that the single unit of the ultrasonic transducer 20 vibrates at the predetermined resonance frequency Frref.

In the third modification of the second embodiment shown in FIG. 9, a hole 47 is formed in the block extending portion 40 so as to extend along a direction (substantially perpendicular) intersecting the longitudinal axis C. . The hole 47 has a hole area Sc substantially perpendicular to the extending direction of the hole 47. Also in this modification, the extension dimension L3 in the direction along the longitudinal axis C of the block extending portion 40 is a predetermined size L3ref, and the direction along the longitudinal axis C from the proximal end to the distal end of the ultrasonic transducer 20 is the same. The dimension L2 is a predetermined size L2ref.

In this modification, the resonance frequency Fr of the ultrasonic transducer 20 alone is adjusted by adjusting the hole area Sc of the hole 47. In the site | part in which the hole 47 is formed, intensity | strength becomes low compared with the other site | part of the block extending part 40, ie, the other site | part of the base end side block 23. FIG. For this reason, the ratio of the part with low intensity | strength changes in the block extending part 40 by changing the hole area Sc. Moreover, when the hole area Sc changes, the shape of the block extending part 40 and the shape of the base end side block 23 change, and the rigidity and mass of the base end side block 23 change. Due to the change described above, the resonance frequency Fr in the vibration of the ultrasonic transducer 20 changes. Therefore, the hole area Sc substantially perpendicular to the extending direction of the hole 47 affects the resonance frequency Fr. Also in this modification, the hole area Sc of the hole 47 is adjusted so that the single unit of the ultrasonic transducer 20 vibrates at the predetermined resonance frequency Frref. In one embodiment, as described above, the resonance frequency Fr is detected by a vibrometer or the like, and the hole area Sc is adjusted based on the detection result of the resonance frequency Fr. In another embodiment, the relationship between the hole area Sc and the resonance frequency Fr is estimated from the physical properties (materials) such as the rigidity of the members constituting the ultrasonic transducer 20 and the shapes of these members. The hole area Sc is adjusted based on the relationship.

FIG. 10 is a diagram showing an example of the relationship between the hole area Sc of the hole 47 and the resonance frequency Fr of the ultrasonic transducer 20. In FIG. 10, the horizontal axis indicates the hole area Sc, and the vertical axis indicates the resonance frequency Fr. Here, the relationship between the hole area Sc and the resonance frequency Fr changes in accordance with physical properties (materials) such as the rigidity of the members constituting the ultrasonic transducer 20 and the shapes of the members. However, in any case, as shown in FIG. 10, the resonance frequency Fr decreases as the hole area Sc increases, that is, when the proportion of the portion with low strength in the block extending portion 40 increases.

In the example shown in FIG. 10, the ultrasonic transducer 20 vibrates at a resonance frequency Fr5 higher than a predetermined resonance frequency Frref in a state where the hole area Sc becomes the size Sc1. In this case, the hole area Sc is increased from the size Sc1 to the size Sc2 based on the detection result of the resonance frequency Fr or the estimated relationship between the hole area Sc and the resonance frequency Fr. By adjusting the hole area Sc to the size Sc2, the single unit of the ultrasonic transducer 20 is in a state of vibrating at the predetermined resonance frequency Frref.

Further, in a modification, the ultrasonic transducer is adjusted by adjusting the position along the longitudinal axis C of the hole 47 instead of the hole area Sc of the hole 47 or in addition to the hole area Sc of the hole 47. The resonance frequency Fr of the single unit 20 is adjusted. By changing the position of the hole 47, the shape and rigidity of the block extending portion 40 change, and the resonance frequency of the ultrasonic transducer 20 changes. Also in this modification, the position of the hole 47 or the hole area Sc and the position of the hole 47 are adjusted so that the single unit of the ultrasonic transducer 20 vibrates at the predetermined resonance frequency Frref.

In the second embodiment and its modification, the ultrasonic transducer (20) includes a bolt (21) extending along the longitudinal axis (C) and a tip side to which a tip of the bolt (21) is connected. A block (22), a proximal block (23) to which the proximal end of the bolt (21) is connected, and a distal block (22) and a proximal block (23) in the direction along the longitudinal axis (C) A drive unit (30) attached to the outer periphery of the bolt (21) in a state of being sandwiched between the two. The drive unit (30) includes a piezoelectric element (31) that generates ultrasonic vibration when supplied with electric energy, and the proximal end block (23) extends from the proximal end of the bolt (21) to the proximal end block. A block extension part (40) extending toward the base end side to the base end of (23) is provided. The shape of the block extending portion (40) affects the resonance frequency (Fr) when the ultrasonic transducer (20) vibrates due to the ultrasonic vibration generated in the piezoelectric element (31), and the ultrasonic transducer (20). Due to the occurrence of ultrasonic vibration, the single body of the material vibrates at a predetermined resonance frequency (Frref) due to the shape of the block extending portion (40).

(Other variations)
In addition, in a certain modification, you may combine the structure of 1st Embodiment, and any structure of 2nd Embodiment and its modification. In this case, by adjusting both the pressing force P from the base end side block 23 to the drive unit 30 and the shape of the block extending portion 40, the resonance frequency Fr of the ultrasonic transducer 20 alone is adjusted. Also in this modification, the pressing force P and the shape of the block extending portion 40 are adjusted so that the single unit of the ultrasonic transducer 20 vibrates at the predetermined resonance frequency Frref. Also in this modification, the dimension (L1; L2) in the direction along the longitudinal axis C from the proximal end to the distal end of the ultrasonic transducer 20 is a predetermined size (L1ref; L2ref).

Further, in a modification shown in FIG. 11, the ultrasonic transducer 20 is indirectly connected to the rod member 10 via one or more relay members (not shown). In this case, the relay member is formed from a material having high vibration transmission properties such as a titanium alloy. In the present modification, the above-mentioned supported portion 25 and the horn 26 are provided on the relay member between the ultrasonic transducer 20 and the rod member 10. In the present modification, the space between the distal end and the proximal end of the ultrasonic transducer 20 corresponds to a half wavelength of longitudinal vibration at a predetermined resonance frequency Frref. For this reason, in this modification as well, the ultrasonic transducer 20 vibrates at a predetermined resonance frequency Frref by the ultrasonic vibration generated in the piezoelectric element 31. In this modification, a vibration antinode A1 located closest to the base end of the vibration antinode is generated at the base end of the ultrasonic transducer 20, and the ultrasonic transducer 20 is separated by a half wavelength from the vibration antinode A1 to the front end side. Vibration antinode A2 occurs. Then, in the drive unit 30 and the bolt 21, a vibration node N1 that is a quarter wavelength away from the vibration antinode A1 is generated on the tip side.

In the above-described embodiment and the like, an example in which the length of the ultrasonic transducer 20 corresponds to one wavelength of longitudinal vibration at the predetermined resonance frequency Frref (see FIG. 2), and longitudinal vibration at the predetermined resonance frequency Frref. An example corresponding to a half wavelength (see FIG. 11) has been described. In addition, the length of the single unit of the ultrasonic transducer 20 may be a natural number times the half wavelength of the longitudinal vibration at the predetermined resonance frequency Frref.

In the above-described embodiment and the like, the space between the distal end and the proximal end of the ultrasonic transducer (20) corresponds to a natural number multiple of a half wavelength of longitudinal vibration at a predetermined resonance frequency (Frref). That is, the pressing force (P) from the base end side block (23) to the drive unit (30) and the base end side so that the single unit of the ultrasonic transducer (20) vibrates at a predetermined resonance frequency (Frref). At least one of the shapes of the block extending portions (40) of the block (23) is adjusted.

The embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the invention.

Claims

Attaching a drive unit comprising a piezoelectric element that generates ultrasonic vibrations when electric energy is supplied to the outer periphery of a bolt extending along the longitudinal axis from the proximal end to the distal end;
The base end is sandwiched between a front end side block to which the front end portion of the bolt is connected and a base end side block to which the base end portion of the bolt is connected in the direction along the longitudinal axis. Applying a pressing force from the side block to the driving unit toward the distal end;
The base end side of the ultrasonic transducer including the bolt, the front end side block, the base end side block, and the drive unit vibrates at a predetermined resonance frequency by the ultrasonic vibration generated in the piezoelectric element. Adjusting the pressing force from a block to the drive unit;
A method of manufacturing an ultrasonic transducer comprising:
In a state where the pressing force from the proximal end side block to the drive unit is adjusted, the dimension in the direction along the longitudinal axis from the proximal end to the distal end of the ultrasonic transducer is set to a predetermined size. The manufacturing method according to claim 1, further comprising:
Adjusting the pressing force is
In a state where the pressing force is applied from the base end side block to the drive unit, the ultrasonic transducer is vibrated by the ultrasonic vibration generated by the piezoelectric element, and the ultrasonic transducer vibrates. Detecting the resonant frequency;
Adjusting the pressing force to the drive unit based on the detection result of the resonance frequency;
The manufacturing method of Claim 1 provided with these.
A bolt having a proximal end and a distal end and extending along the longitudinal axis from the proximal end to the distal end;
A tip side block to which the tip of the bolt is connected;
A proximal block to which a proximal end of the bolt is connected;
A piezoelectric element that generates ultrasonic vibrations when supplied with electrical energy is provided, and the outer periphery of the bolt is sandwiched between the distal end side block and the proximal end side block in a direction along the longitudinal axis. An attached drive unit; and
An ultrasonic transducer comprising:
The base end side block includes a block extending portion extending toward the base end side from the base end of the bolt to the base end of the base end side block,
The shape of the block extending portion affects the resonance frequency in a state where the ultrasonic transducer vibrates due to the ultrasonic vibration generated in the piezoelectric element,
The single unit of the ultrasonic transducer including the bolt, the distal end side block, the proximal end side block, and the drive unit is caused by the shape of the block extending portion due to the generation of the ultrasonic vibration. Vibrates at the resonance frequency of
Ultrasonic transducer.
The extension dimension of the block extension part in the direction along the longitudinal axis from the base end of the bolt to the base end of the base end side block is a predetermined size,
The dimension in the direction along the longitudinal axis from the proximal end to the distal end of the ultrasonic transducer is a predetermined size.
The ultrasonic transducer according to claim 4.
The block extending portion has a first extending region in which a cross-sectional area perpendicular to the longitudinal axis becomes a first cross-sectional area, and a portion different from the first extending region in the direction along the longitudinal axis. A second extension region extending and having a cross-sectional area perpendicular to the longitudinal axis that is a second cross-sectional area smaller than the first cross-sectional area,
The second cross-sectional area in the second extending region and the dimension in the direction along the longitudinal axis of the second extending region are the resonance frequency in a state where the ultrasonic transducer vibrates. Influencing,
The single unit of the ultrasonic transducer has at least one of the second cross-sectional area in the second extending region and the dimension of the second extending region by generating the ultrasonic vibration. Due to the vibration at the predetermined resonance frequency,
The ultrasonic transducer according to claim 4.
In the first extension region, a range surrounded by the outer periphery in a cross section perpendicular to the longitudinal axis is a first range area,
In the second extension region, a range surrounded by an outer periphery in the cross section perpendicular to the longitudinal axis is a second range area smaller than the first range area.
The ultrasonic transducer according to claim 6.
The first extension region is formed solid,
The second extending region has a hole extending along the longitudinal axis and is formed hollow.
The ultrasonic transducer according to claim 6.
The block extending portion has a hole extending along a direction intersecting the longitudinal axis,
The hole area perpendicular to the extending direction of the hole affects the resonance frequency in a state where the ultrasonic transducer vibrates,
The single unit of the ultrasonic transducer vibrates at the predetermined resonance frequency due to the hole area of the hole due to the generation of the ultrasonic vibration.
The ultrasonic transducer according to claim 4.
Attaching a drive unit comprising a piezoelectric element that generates ultrasonic vibrations when electric energy is supplied to the outer periphery of a bolt extending along the longitudinal axis from the proximal end to the distal end;
In the state where the block extending portion extends toward the base end side from the base end of the bolt to the base end of the base end side block in the base end side block, the base end portion of the bolt is changed to the base end side block. Connecting,
Sandwiching the drive unit between the distal end side block and the proximal end block to which the distal end of the bolt is connected in the direction along the longitudinal axis;
The block extending portion is brought into a state where a single ultrasonic transducer including the bolt, the distal end side block, the proximal end side block, and the drive unit vibrates at a predetermined resonance frequency due to the ultrasonic vibration generated in the piezoelectric element. Adjusting the shape of the
A method of manufacturing an ultrasonic transducer comprising:
Connecting the bolt to the block at the base end means that the extension dimension of the block extending portion in the direction along the longitudinal axis from the base end of the bolt to the base end of the base end side block is determined. Providing a predetermined size for the direction along the longitudinal axis from the proximal end to the distal end of the ultrasonic transducer by having a predetermined size;
Adjusting the shape of the block extending portion comprises adjusting the shape of the block extending portion without changing the extension dimension of the block extending portion from the predetermined size.
The manufacturing method of Claim 10.
Adjusting the shape of the block extending portion,
In a state where a pressing force is applied from the base end side block to the drive unit, the ultrasonic transducer is vibrated by the ultrasonic vibration generated by the piezoelectric element, and resonance in vibration of the ultrasonic transducer is caused. Detecting the frequency,
Adjusting the shape of the block extending portion based on the detection result of the resonance frequency;
The manufacturing method of Claim 10 provided with these.