CN110882881B - Ultrasonic transducer for ultrasonic surgical instrument and ultrasonic surgical instrument thereof - Google Patents
Ultrasonic transducer for ultrasonic surgical instrument and ultrasonic surgical instrument thereof Download PDFInfo
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- CN110882881B CN110882881B CN201811055889.8A CN201811055889A CN110882881B CN 110882881 B CN110882881 B CN 110882881B CN 201811055889 A CN201811055889 A CN 201811055889A CN 110882881 B CN110882881 B CN 110882881B
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- 229910052751 metal Inorganic materials 0.000 claims abstract description 93
- 239000002184 metal Substances 0.000 claims abstract description 93
- 239000000919 ceramic Substances 0.000 claims abstract description 21
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- 230000001808 coupling effect Effects 0.000 abstract description 2
- 238000002604 ultrasonography Methods 0.000 description 21
- 239000000463 material Substances 0.000 description 12
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- 238000006073 displacement reaction Methods 0.000 description 5
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- 229910001069 Ti alloy Inorganic materials 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000008358 core component Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000012636 effector Substances 0.000 description 3
- 230000023597 hemostasis Effects 0.000 description 3
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- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000036316 preload Effects 0.000 description 2
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- 230000004323 axial length Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
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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
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
- B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/32—Surgical cutting instruments
- A61B17/320068—Surgical cutting instruments using mechanical vibrations, e.g. ultrasonic
-
- 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
- B06B2201/00—Indexing scheme associated with B06B1/0207 for details covered by B06B1/0207 but not provided for in any of its subgroups
- B06B2201/50—Application to a particular transducer type
- B06B2201/55—Piezoelectric transducer
-
- 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
- B06B2201/00—Indexing scheme associated with B06B1/0207 for details covered by B06B1/0207 but not provided for in any of its subgroups
- B06B2201/70—Specific application
- B06B2201/76—Medical, dental
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- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Surgery (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Heart & Thoracic Surgery (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Biomedical Technology (AREA)
- Dentistry (AREA)
- Medical Informatics (AREA)
- Molecular Biology (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
Abstract
The invention provides an ultrasonic transducer which is used for an ultrasonic surgical instrument and comprises a pre-tightening rod, a rear metal block, a piezoelectric ceramic piece, an electrode plate and a front metal block, wherein the pre-tightening rod, the rear metal block, the piezoelectric ceramic piece, the electrode plate and the front metal block are sequentially and coaxially connected; wherein: the back metal block is provided with a groove part, and the pre-tightening rod is embedded in the groove part of the back metal block, so that the structural layout of the ultrasonic transducer is improved, the pressure is effectively conducted, and the resonance characteristic of the ultrasonic resonance system is improved. The invention also provides an ultrasonic surgical instrument comprising the ultrasonic transducer. The ultrasonic transducer provided by the invention can improve the resonance impedance of the transducer and the working temperature field of the transducer, thereby ensuring that the transducer has better electromechanical coupling effect and good resonance working state and improving the operation effect of an ultrasonic surgical instrument.
Description
Technical Field
The invention relates to the field of ultrasonic surgical instruments, in particular to an ultrasonic transducer for an ultrasonic surgical instrument and the ultrasonic surgical instrument thereof.
Background
Ultrasonic surgical instruments, including ultrasonic surgical blades, are increasingly used in the clinic due to their unique properties of precise cutting, rapid hemostasis, etc. A core component in an ultrasonic surgical instrument that provides for the conversion of electrical energy into ultrasonic vibrations is an ultrasonic transducer that generates mechanical vibrations at ultrasonic frequencies that are transmitted through a transmission device or waveguide to an end effector (e.g., a tool tip) to cause vibration of the end effector relative to the transmission device, where the vibration of the end effector generates localized heat within body tissue to aid in cutting the tissue and coagulation hemostasis. It can be seen that the ultrasonic transducer plays a key role in the overall performance of the ultrasonic surgical instrument, and directly affects the energy conversion efficiency of the ultrasonic surgical knife system and the cutting hemostasis effect of the knife head.
Fig. 1 is a schematic structural diagram of an ultrasonic transducer in the prior art. As shown in fig. 1, in the prior art, an ultrasonic transducer 10 in the medical field includes a pre-tightening screw 11, a rear metal block 13, a crystal stack 15 including piezoelectric ceramic sheets, and a front metal block 17, which are coaxially connected. Fig. 2 is a side view of a prior art ultrasound transducer. As shown in fig. 2, in this structure, the rod head of the pre-tightening screw 11 is attached to the first surface of the rear metal block 13 away from the front metal block 17 (i.e. the rod head of the pre-tightening screw 11 is circumscribed or attached to the rear metal block 13), i.e. the pre-tightening screw 11 applies the pre-tightening force through the first surface of the rear metal block 13 of the transducer 10.
One important measure of the characteristics of an ultrasonic vibration system is the resonance characteristics, which can be expressed as the resonance frequency, the resonance impedance, and the resonance amplitude. In general, the resonant amplitude, resonant impedance, and the like of the ultrasonic vibration system are mainly determined by the material and structure of the ultrasonic transducer. The material mainly relates to the selection of the core energy conversion material, namely the piezoelectric ceramic piece, the structure mainly relates to the node of the transducer, the layout of the vibration gain and the like, and the relationship of the three parts has mutual influence and coaction on the frequency, the impedance and the amplitude of the ultrasonic transducer.
In the prior art structure shown in fig. 1 and 2, the pre-load force is transmitted to the piezoceramic wafer completely through the rear metal block attached to the pre-load rod. Therefore, the greater thickness of the metal block behind the prior art ultrasonic transducer affects the effective conductance and uniformity of pressure within the ultrasonic resonant system (i.e., the ultrasonic surgical instrument) and also increases the impedance of the ultrasonic resonant system, thereby affecting the energy transfer rate of the system. In addition, because the energy converter is a heat emission source under the high-power working state, the temperature effect is very obvious, and because the structure that the back metal block and the pre-tightening screw rod are attached in the prior art has certain influence on the heat diffusion and the heat conduction of the energy converter. Especially in high power conditions, the more heat is diffused, which is not favorable for improving the thermal environment of the transducer. This significant temperature can have a very detrimental effect on the performance of the transducer.
Disclosure of Invention
Therefore, the invention provides a novel transducer pre-tightening structure which can improve the resonance impedance and the conduction performance of the transducer and can improve the working temperature field of the transducer, thereby ensuring that the transducer has better electromechanical coupling effect and good resonance working state.
According to an embodiment of the present invention, there is provided an ultrasonic transducer for an ultrasonic surgical instrument, characterized in that the ultrasonic transducer includes a pre-tightening rod, a rear metal block, a piezoelectric ceramic sheet, an electrode sheet, and a front metal block, the pre-tightening rod, the rear metal block, the piezoelectric ceramic sheet, the electrode sheet, and the front metal block being coaxially connected in this order; wherein: the rear metal block is provided with a groove part, and the pre-tightening rod is embedded in the groove part of the rear metal block. Therefore, the structural layout of the ultrasonic transducer is improved, the pressure is effectively conducted, and the resonance characteristic of the ultrasonic resonance system is improved.
In further embodiments of the present invention, the depth of the groove portion of the rear metal block of the ultrasonic transducer may be 1/3 to 3/5 of the height of the rear metal block.
In a further embodiment of the invention, the ratio D2/D1 of the diameter D2 of the groove portion of the rear metal block to the overall diameter D1 of the rear metal block is equal to or greater than 0.75.
In another embodiment of the present invention, the pre-tightening rod comprises a rod head and a rod body, and the groove portion of the rear metal block may have a depth smaller than the height of the rod head of the pre-tightening rod.
In further embodiments of the present invention, the head of the pretensioned rod may be higher than the first surface of the rear metal block by a height of 3/5 to 3/4 of the head height.
In further embodiments of the present invention, the head diameter of the pre-tightening rod may be smaller than the diameter of the groove portion of the rear metal block.
In a further embodiment of the invention, the head of the pretensioning lever can be provided with an auxiliary support surface, which can be arranged symmetrically.
In further embodiments of the invention, the number of auxiliary support surfaces of the pre-tensioned club head may be an even number.
In further embodiments of the present invention, the auxiliary support surface may be higher than the first surface of the rear metal block.
In a further embodiment of the invention, the material of the pre-tightening rod may be a titanium alloy.
In a further embodiment of the invention, the material of the rear metal block may be steel.
In further embodiments of the invention, the front metal block may be connected to a horn, which may be a half-wavelength variable cross-section structure.
According to further embodiments of the present invention, an ultrasonic surgical instrument may be provided, comprising a main body, a cutting head, a waveguide rod, and may further comprise an ultrasonic transducer as described above.
In the embodiment of the invention, the head of the pre-tightening rod is embedded in the rear metal block, so that the volume-to-mass ratio of the head of the pre-tightening screw is reduced, and the effective transmission of pressure, high-frequency vibration and uniform and pure vibration modes of the transducer are ensured. Therefore, the transducer of the embodiment of the invention has lower impedance, better temperature field distribution and better resonance characteristic, and the optimized temperature field enables the transducer to have better working state under the high-power working environment.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 illustrates a schematic structural diagram of a typical ultrasound transducer of the prior art;
FIG. 2 illustrates a side view of a prior art ultrasound transducer;
FIG. 3 illustrates an exploded schematic view of an ultrasound transducer according to an embodiment of the present invention;
FIG. 4 illustrates a side view of an ultrasound transducer according to an embodiment of the present invention;
FIG. 5 illustrates a schematic view of a back metal block of an ultrasound transducer according to an embodiment of the invention;
FIG. 6 illustrates a schematic view of a pre-tensioning rod of an ultrasound transducer according to an embodiment of the present invention;
FIG. 7 illustrates a schematic view of a pre-tensioned bar of an ultrasound transducer according to an embodiment of the invention;
FIG. 8 illustrates a side view of a pre-tensioning rod of an ultrasound transducer in accordance with an embodiment of the present invention;
FIG. 9 illustrates a side view of a pre-tensioning rod of an ultrasound transducer in accordance with an embodiment of the present invention;
fig. 10 illustrates an assembly structure view of a pretension screw and a rear metal block of an ultrasonic transducer according to an embodiment of the present invention;
FIG. 11 illustrates a schematic view of a front metal block of an ultrasound transducer according to an embodiment of the present invention;
FIG. 12 illustrates a frequency versus impedance plot of an ultrasonic surgical instrument including an ultrasonic transducer in accordance with an embodiment of the present invention in comparison to a prior art system;
FIG. 13 illustrates a comparison of temperature field distributions of an ultrasound transducer according to an embodiment of the present invention and a prior art ultrasound transducer; and
fig. 14 illustrates a mode displacement profile of an ultrasonic transducer according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention.
The same or similar numbered elements/components used in the drawings and the embodiments are used to represent the same or similar parts. And the drawings are merely schematic, the elements of which are not necessarily to scale.
Figure 3 illustrates an exploded view of an ultrasound transducer according to one embodiment of the present invention. As shown in fig. 3, the ultrasonic transducer 30 according to the embodiment of the present invention includes a pre-tightening rod 310, a rear metal block 320, a piezoelectric ceramic piece 331, an electrode piece 332 (the piezoelectric ceramic piece and the electrode piece form a crystal stack 330), and a front metal block 340. The pre-tightening rod 310, the rear metal block 320, the piezoelectric ceramic sheet 331, the electrode sheet 332 and the front metal block 340 are coaxially connected in sequence, i.e., stacked according to the same axis of symmetrybase:Sub>A-base:Sub>A.
Figure 4 illustrates a side view of an ultrasound transducer according to an embodiment of the present invention. As shown in fig. 4, a groove portion 321 is provided in the rear metal block 320 fitted over the pre-tightening rod 310, and the pre-tightening rod 310 is fitted into the groove portion 321, so that the pre-tightening rod 310 and the rear metal block 320 are more closely connected.
As shown in fig. 3 and 4, the piezoceramic sheets 331 are arranged in the middle of the transducer 30, and the electrode pads 332 are interleaved with the piezoceramic sheets 331 so that an electrical signal may be applied to the piezoceramic sheets 331. The back metal blocks 320 and the front metal blocks 340 are distributed above and below (or to the left and right depending on whether the transducer 30 is placed above and below or to the left and right) the piezoelectric ceramic plates, and finally, the components of the vibration system are tightly pressed into a whole through the pre-tightening rods 310. And good contact is kept between the surfaces of all the components of the ultrasonic transducer so as to ensure the efficient transmission of sound energy. Therefore, the novel structure improves the structural layout of the ultrasonic transducer, effectively conducts pressure and improves the resonance characteristic of the ultrasonic resonance system.
The transducer vibration frequency is determined by the material properties of each component, i.e., young's modulus and density, as well as the axial length dimension. In an embodiment of the present invention, the operating frequency of the ultrasonic vibration system is approximately 55.5KHz, which determines the approximate size of the transducer and the length distribution of the components. In an embodiment of the invention, the front metal block 340 of the transducer is connected with a one-half wavelength horn structure to amplify the effect from the transducer vibrations. While the overall size of the transducer is approximately 90mm with the horn portion being approximately 49mm in length. The amplitude of the transducer is determined by the core component piezoelectric ceramic piece and the whole structure of the transducer, and the impedance of the transducer is determined by the core component piezoelectric ceramic piece and the pre-tightening structure. Wherein the frequency f of the transducer can be expressed as:
f＝(sqrt(E/ρ))/2*L (1)
where E is the Young's modulus of the material, ρ is the material density, and L represents the transducer length.
In the embodiment of the invention, the dimensional relationship of each part of the transducer is determined by the following free vibration characteristic equation under the condition that the basic assembly relationship is satisfied:
([K]-ω 2 [M]){U 0 }＝{0} (2)
wherein [ K ]]Representing the stiffness matrix of the transducer system, [ M ]]Representing the quality matrix, U, of the transducer system 0 Representing the vibrational displacement of the transducer system,ω represents the vibration circle frequency of the system. For our vibration system, the materials of all parts are known, and the target structure frequency omega is also known, so that the vibration displacement U meeting the mode shape requirement is obtained 0 The corresponding system quality matrix is the target quality matrix of the embodiment of the invention, i.e. the composition of the mass of each part of the transducer to determine the composition of each part structure.
In an embodiment of the invention, the pre-tensioned structure of the transducer comprises a back metal block 320, a front metal block 340 and a pre-tensioning rod 310, which together secure the die stack to form a compact whole, i.e. the transducer. Fig. 5 illustrates a schematic view of a back metal block of an ultrasonic transducer according to an embodiment of the present invention. As shown in fig. 5, a groove portion 321 is provided in the rear metal block 320, so that the rear metal block 320 exhibits a stepped structure having a first surface S1, a second surface S2, and a third surface S3. The first surface S1 is a reference surface, and is not in contact with other components as a part of the vibrating mass. The second surface S2 of the rear metal block 320, which is a surface of the inner step forming groove portion 321, has a smaller diameter than the other surfaces. The second surface S2 is directly contacted with the pre-tightening rod 310 (i.e., contacted with the third surface of the pre-tightening rod), and is a source surface of the pressure of the piezoelectric ceramic crystal stack. In the embodiment of the present invention, the diameter of the second surface S2 may be the same as or slightly larger than the diameter of the head of the pre-tightening rod, so as to ensure the transmission of the pressure. The third surface S3 of the metal block 320 is the surface directly contacting the piezoelectric ceramic plate and is also the direct acting surface of the piezoelectric stack pressure.
Therefore, the transducer is a specific high-frequency vibration system, and the masses of all parts need to be combined according to a certain proportion, so that the transducer can be ensured to have a uniform and pure vibration mode. In an embodiment of the present invention, the groove depth of the rear metal block 320 may be less than the head height of the pre-tightening rod 310. In an embodiment of the present invention, the depth d of the groove in the back metal block 320 may be 1/3 to 3/5 of the height h of the back metal block, thereby ensuring more efficient transfer of pressure and high frequency vibration to give a uniform, clean mode shape to the transducer.
In the embodiment of the present invention, the diameter D2 of the groove portion (also referred to as an inner step) of the rear metal block 320 is smaller than the overall diameter D1 of the rear metal block 320, and D2/D1> =0.75 may be set to ensure that the rear metal block has a suitable mass and an effective pressure transmission.
Fig. 6 illustrates a schematic view of a pre-tensioned bar of an ultrasound transducer according to an embodiment of the invention. As shown in fig. 6, the pretensioning rod 310 includes a rod head 311 and a rod body 312. In the embodiment of the present invention, in order to embed the pretensioning rod 310 in the rear metal block 320, the diameter of the rod head 311 is smaller than or equal to the diameter of the groove portion 321 of the rear metal block. The diameter of the groove portion 321 of the rear metal block 320 of the embodiment of the present invention may be larger than that of the head 311 in order to more effectively transmit the pressure. In an embodiment of the present invention, the diameter of the groove portion 321 may be 0.2 to 0.5mm larger than the diameter of the club head 311.
In an embodiment of the present invention, for convenience of installation, an auxiliary support surface may be provided on the rod head 311 to ensure that the torque wrench can effectively apply torque to the pre-tightening screw. Fig. 7 illustrates a top view of a pre-tensioning rod of an ultrasound transducer according to an embodiment of the present invention. As shown in fig. 6 and 7, the head 311 has a first surface S4, a second surface S5, and a third surface S6, and the second surface S5 is an auxiliary support surface. In an embodiment of the invention, the second surface may be composed of a plurality of auxiliary support surfaces, which are symmetrically arranged. For example, in fig. 7, the auxiliary supporting surface may be provided in symmetrical 2 at the input end head portion. Fig. 8 illustrates a top view of a pre-tensioning rod of an ultrasound transducer according to an embodiment of the present invention. As shown in fig. 8, the auxiliary support surfaces may be provided in 4 symmetrical numbers. Fig. 9 illustrates a top view of a pre-tensioned bar of an ultrasound transducer according to an embodiment of the invention. As shown in fig. 9, the auxiliary support surfaces may be provided in symmetrical 6 numbers. Of course, an arbitrarily symmetrical even number may also be provided. In an embodiment of the invention, the auxiliary support surface may also be provided as a circular table surface, in which case the fastening torque application surface may be designed on the back metal block for convenience of transducer assembly.
In an embodiment of the present invention, the second surface of the pre-tightening rod is lower than the first surface, but is higher than a portion of the first surface of the rear metal block 320 during assembly, so as to ensure that the pre-tightening rod does not rub against the rear metal block and is damaged during the process of pressing (assembling) the transducer.
Fig. 10 illustrates an assembly structure view of a pretension screw and a rear metal block of an ultrasonic transducer according to an embodiment of the present invention. As shown in fig. 10, when the pre-tightening rod 310 and the rear metal block 320 are assembled, a part d2 of the head of the pre-tightening screw is embedded in the groove portion (or the inner step) of the rear metal block, and the auxiliary supporting step surface (or the auxiliary supporting surface) of the pre-tightening rod is slightly higher than the first surface of the rear metal block, and the height d3 of the head can be about one fifth of the height of the head, thereby meeting the requirement of the vibration mode. As shown in fig. 9, the head height d is the sum of the head first surface to second surface (auxiliary support surface) height d1 and the embedded portion height d2 (i.e., the depth of the groove portion) and the auxiliary support surface to rear metal block first surface height d3, and may be expressed as d = d1+ d2+ d3.
In the embodiment of the present invention, the height of the head of the pretensioning rod 310 above the first surface of the rear metal block 320 may be 3/5 to 3/4 of the head height, may be selected to be about 2/3 of the head height, and may also be substantially equal to the height of the embedded portion. This optimized mass combination may provide superior system resonance characteristics, while the tighter connection also results in the embedded pretensioning structure of an embodiment of the invention providing superior heat conduction.
It should be appreciated that steel has a better thermal conductivity than titanium alloys, and is more conducive to heat transfer. Medical transducers are typically mounted inside a handle assembly (not shown herein) and have no heat sink, which places greater demands on the structural layout and material selection of the transducer. In the embodiment of the invention, a steel rear metal block can be adopted, which is more favorable for heat conduction. The titanium alloy pre-tightening rod can be embedded in the rear metal block, and the titanium alloy has a smaller mass ratio, so that the integral heat conduction of the transducer becomes better.
Fig. 13 illustrates a comparison of the temperature field distribution of an ultrasound transducer according to an embodiment of the present invention with that of a prior art ultrasound transducer, as shown in fig. 13, which has a lower temperature field under the same conditions. Temperature is an important measure of the transducer, especially in high power environments. Under the high-power work, the transducer raises the temperature obviously, the sharp temperature rise can make the piezoelectric property of the piezoelectric ceramic piece of the transducer produce depolarization, the efficiency of the transducer can be reduced, and when the piezoelectric property is reached to a certain value, the piezoelectric ceramic piece can lose the piezoelectric property, thereby losing the characteristic of energy conversion. As shown in fig. 13, the structure of the embodiment of the present invention effectively alleviates the temperature rise of the transducer, and can keep the transducer in a high-efficiency state, so that the transducer is in a better working state.
The transducer of an embodiment of the present invention further comprises a front metal block 340. Fig. 11 illustrates a schematic structural diagram of a front metal block according to an embodiment of the present invention. As shown in fig. 11, the first surface p1 of the front metal block is in direct contact with the piezoelectric ceramic crystal stack structure, so the smoothness of the first surface p1 of the front metal block has an important influence on the energy dissipation, i.e. impedance, of the transducer, and the better the smoothness is, the smaller the friction loss with the piezoelectric ceramic plate is, and the smaller the resonant impedance of the transducer is. First screw hole of front metal block 340
Just forms a pre-tightening structure with the pre-tightening rod 310 to apply a pre-tightening torque to the piezoelectric crystal stack. And a second screw hole of the front metal block 340
For coupling to a tool holder to ensure efficient transmission of acoustic energy. The front metal block (front drive structure) of an embodiment of the present invention includes a half wavelength horn structure (to which the horn is attached) 341 to amplify the effect from the transducer vibrations. Theoretically, the wave propagation can reduce the loss of wave propagation energy and reduce the assembly process. The horn 341 of the embodiment of the present invention is designed with a variable cross section and has arc transition, so that the amplitude from the transducer can be amplified and the frequency of the vibration system can be adjusted. In order to satisfy the requirement of amplification factor, the input diameter D and the output diameter D should satisfy a certain relationshipThis is closely related to the magnification, and in embodiments of the invention where the horn achieves a magnification factor of 3.5 or more, D and D need to satisfy a relationship of approximately 2. In embodiments of the invention, a flange structure may be provided at the vibration node of the horn for securing the transducer.
In embodiments of the present invention, the above components are assembled using a suitable tooling fixture, and a high efficiency transducer of an electromechanical coupled vibration system is realized. The transducer can start working by applying electric signals at two ends of the piezoelectric ceramic piece, and converts electric energy into mechanical energy so as to transmit the mechanical energy to the waveguide rod, and the waveguide rod starts vibrating so as to realize the functions of cutting tissues or stopping bleeding and the like of the tool bit.
In an embodiment of the present invention, there is also provided an ultrasonic surgical instrument comprising a main body, a cutter head, a waveguide rod, and an ultrasonic transducer as described above, thereby operating more efficiently with better resonance characteristics and more uniform mode shape.
The impedance curve is one of the most basic and important measurement standards of the ultrasonic vibration system, and the basic characteristics of the ultrasonic vibration system can be almost reflected in the impedance curve. FIG. 12 illustrates a frequency versus impedance plot comparison of an ultrasonic surgical instrument including an ultrasonic transducer in accordance with an embodiment of the present invention and a prior art system. As shown in fig. 12, the transducer of the embodiment of the present invention has a continuous and smooth impedance curve, two resonance points with a bandwidth of about 800Hz, and a wider frequency, i.e., a wider phase margin. The resonance impedance is only about 10 ohms, and the amplification factor of the transducer reaches about 4. Compared with the prior design, the transducer of the invention has the advantages of better impedance curve, lower impedance near a resonance point and wider frequency range between the resonance point and an anti-resonance point. It is apparent that the transducer of the embodiment of the present invention has better resonance frequency characteristics and wider phase margin between two resonance points, which indicates that the transducer of the present patent has better electromechanical coupling degree and is easier to match with a host system, thereby maintaining good working state. Especially, under the environment with more intense high power, the characteristic of the transducer is more important, and the transducer is always in a resonance working state due to the better frequency characteristic, so that high-efficiency output is kept.
Fig. 14 illustrates a mode displacement profile of an ultrasonic transducer according to an embodiment of the present invention. As shown in fig. 12, the transducer of the embodiment of the present invention has a very uniform displacement distribution with a magnification of 4.08.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being permanently connected, detachably connected, or integral; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, references to the description of the term "the present embodiment," "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction. The invention relates to the 'A and/or B', which can be understood to include three cases of A, B and AB; in addition, references to "acoustic" herein are to be understood as references to "ultrasonic" unless otherwise indicated.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the invention, and any modifications, equivalents and simple improvements made on the spirit of the present invention should be included in the scope of the present invention.
Claims (6)
1. An ultrasonic transducer is used for an ultrasonic surgical instrument and is characterized by comprising a pre-tightening rod, a rear metal block, a piezoelectric ceramic piece, an electrode plate and a front metal block, wherein the pre-tightening rod, the rear metal block, the piezoelectric ceramic piece, the electrode plate and the front metal block are sequentially and coaxially connected; wherein:
the rear metal block is provided with a groove portion, an
The pre-tightening rod is embedded in the groove part of the rear metal block;
the depth of the groove part of the rear metal block is 1/3 to 3/5 of the height of the rear metal block;
the height of the head of the pre-tightening rod, which is higher than the first surface of the rear metal block, is 3/5 to 3/4 of the height of the head, the head of the pre-tightening rod is provided with auxiliary support surfaces, and the auxiliary support surfaces are symmetrically arranged;
the ratio D2/D1 of the diameter D2 of the groove part of the rear metal block to the overall diameter D1 of the rear metal block is greater than or equal to 0.75.
2. The ultrasonic transducer according to claim 1, wherein said pre-fastening rod comprises a rod head and a rod body, and the groove portion of said rear metal block has a depth smaller than the height of the rod head of said pre-fastening rod.
3. The ultrasonic transducer according to claim 1, wherein a tip diameter of the pre-fastening rod is smaller than a diameter of the groove portion of the rear metal block.
4. The ultrasonic transducer of claim 1, wherein the auxiliary support surface is higher than the first surface of the back metal block.
5. The ultrasonic transducer according to any one of claims 1 to 4 wherein a horn is attached to said front metal block, said horn being a half wavelength variable cross-section structure.
6. An ultrasonic surgical instrument comprising a main body, a cutter head, a waveguide rod, and an ultrasonic transducer according to any one of claims 1 to 5.
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| CN201811055889.8A CN110882881B (en) | 2018-09-11 | 2018-09-11 | Ultrasonic transducer for ultrasonic surgical instrument and ultrasonic surgical instrument thereof |
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| CN201811055889.8A CN110882881B (en) | 2018-09-11 | 2018-09-11 | Ultrasonic transducer for ultrasonic surgical instrument and ultrasonic surgical instrument thereof |
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| CN111358685A (en) * | 2020-03-18 | 2020-07-03 | 天津大学 | Ultrasonic auxiliary sputum excretion device for sputum liquefaction |
| CN113441940B (en) * | 2021-06-30 | 2022-09-27 | 哈尔滨工业大学 | Piezoelectric transducer pre-tightening assembly device and method loaded along axial direction of bolt |
| CN113476110A (en) * | 2021-08-21 | 2021-10-08 | 成都科汇模具有限公司 | Compression rear cover of medical ultrasonic knife transducer |
| CN114587508B (en) * | 2022-03-09 | 2024-07-09 | 苏州锐诺医疗技术有限公司 | Wireless ultrasonic knife transducer |
| CN115008508A (en) * | 2022-06-06 | 2022-09-06 | 集美大学 | Ultrasonic cutting knife |
| CN115138546B (en) * | 2022-06-29 | 2023-05-26 | 湖南大学 | Ultrasonic surgical knife with longitudinal composite amplitude transformer and design method thereof |
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Effective date of registration: 20200812 Address after: Room 401, building 15, Xibei District, nano City, 99 Jinjihu Avenue, Suzhou Industrial Park, Suzhou City, Jiangsu Province Applicant after: Suzhou Ruinuo Medical Technology Co.,Ltd. Address before: 100085, basement -1, basement 1, building A, 3rd Street, Haidian District, Beijing, 445 Applicant before: BEIJING RUINUO MEDICAL TECHNOLOGY Co.,Ltd. |
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