An ultrasonic vibration device with a built-in amplitude transformer

Abstract

The application discloses an ultrasonic vibration device with a built-in amplitude transformer. The ultrasonic vibration device comprises a shell, a mounting cavity in the shell, a mounting hole on the shell, a hollow locking rod installed in the mounting cavity, the hollow locking rod having a center hole, a piezoelectric transducer installed in the mounting cavity and surrounding the hollow locking rod, a first amplitude transformer installed in the center hole, the first amplitude transformer being fixed at one end of the hollow locking rod and having at least a part of a length located in a space surrounded by the piezoelectric transducer, and an instrument rod directly or indirectly connected to the other end of the first amplitude transformer, the instrument rod having a shell, and an instrument working part located outside the shell and arranged on the instrument rod. Thus, the axial length of the ultrasonic vibration device with the built-in amplitude transformer can be reduced, space is saved, and miniaturization design is facilitated.

Description

Technical Field

[0001] This application belongs to the field of dental medical devices, and in particular relates to an ultrasonic vibration device with a built-in amplitude transformer. Background Technology

[0002] In traditional medical devices, the piezoelectric vibration structure 100' typically consists of a mass balance block 1', a piezoelectric transducer 4', and an amplitude transformer 2'. The mass balance block 1' and the amplitude transformer 2' are connected and locked together by a solid locking bolt 5'. Figure 1 As shown. The characteristic of this piezoelectric vibration structure 100' is that the mass balance block 1', piezoelectric transducer 4' and amplitude transformer 2' are arranged in a straight line, in other words, the three are arranged in series, which makes it difficult to achieve a miniaturized design of the structure. Summary of the Invention

[0003] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes an ultrasonic vibration device with a built-in amplitude transformer, which facilitates miniaturization design through improved structural layout.

[0004] An ultrasonic vibration device with a built-in amplitude transformer according to an embodiment of this application includes: a housing, wherein a mounting cavity is provided inside the housing, a handle connection portion is provided on the housing, and a mounting hole communicating with the mounting cavity is provided on the housing; a hollow locking rod, wherein the hollow locking rod is installed in the mounting cavity, one end of the hollow locking rod in the length direction is directly opposite the mounting hole, and the hollow locking rod has a central hole arranged along its length direction; a piezoelectric transducer, wherein the piezoelectric transducer is installed in the mounting cavity, the piezoelectric transducer is arranged around the hollow locking rod, and the hollow locking rod fixes the piezoelectric transducer in the housing; a first amplitude transformer, wherein the first amplitude transformer is installed in the central hole, one end of the first amplitude transformer in the length direction is fixed to the hollow locking rod, and at least a portion of the length of the first amplitude transformer is located within the space surrounded by the piezoelectric transducer; and an instrument rod, wherein the instrument rod is directly or indirectly connected to the other end of the first amplitude transformer in the length direction, the instrument rod is connected to the housing, and an instrument working part is located outside the housing and disposed on the instrument rod.

[0005] According to the ultrasonic vibration device of this application embodiment, by setting a shell to support the internal parts, and providing a handle connection part on the shell to connect the handle body, the weight of the shell itself and the weight borne by the handle body allows the shell to act as a mass counterweight, thereby reducing the structural volume by eliminating the mass counterweight. By arranging the shell, piezoelectric transducer, hollow locking rod and first amplitude transformer along the radial direction, the axial length of the ultrasonic vibration device can be significantly reduced, saving space and facilitating miniaturization design. Moreover, the piezoelectric transducer is arranged radially outside the first amplitude transformer, which allows the first amplitude transformer to receive a large amount of ultrasonic energy, resulting in a larger increase in amplitude under the action of ultrasonic waves, ensuring that the working part of the device can vibrate strongly and improving energy utilization.

[0006] In some embodiments, the first amplitude transformer is a hollow rod; the ultrasonic vibration device further includes a second amplitude transformer, which is installed inside the first amplitude transformer, and at least a portion of the length of the second amplitude transformer is located within the space surrounded by the piezoelectric transducer; the instrument rod is connected to the first amplitude transformer via the second amplitude transformer; one end of the second amplitude transformer is fixedly connected to the first amplitude transformer in the length direction, and the other end is fixedly connected to the instrument rod.

[0007] In some embodiments, the first amplitude rod is a hollow rod, the instrument rod is disposed inside the first amplitude rod, one end of the instrument rod extends out of the first amplitude rod and out of the mounting hole.

[0008] Specifically, the instrument rod includes: an internal section disposed inside the first amplitude transformer; a stepped positioning section connected to one end of the internal section and located outside the first amplitude transformer, the stepped positioning section abutting against the rod end of the first amplitude transformer; the ultrasonic vibration device further includes: a locking nut, the locking nut being sleeved on the radially outer side of the stepped positioning section and locking the stepped positioning section onto the first amplitude transformer.

[0009] Specifically, the built-in section is coaxially arranged with the first amplitude rod, and there is a first gap between the outer surface of the built-in section and the inner surface of the first amplitude rod.

[0010] In some embodiments, the instrument rod further includes an instrument amplitude-changing rod section located outside the housing, and the instrument working part is rigidly connected to the instrument amplitude-changing rod section.

[0011] Specifically, the hollow locking rod has a recessed hole at its end, and one end of the central hole extends into the recessed hole; one end of the first amplitude rod has a first flange that fits into the recessed hole, and the first flange is rigidly connected to the hollow locking rod.

[0012] Specifically, the second amplitude rod has a second flange at one end in the length direction, and the second flange is rigidly connected to the rod end of the first amplitude rod.

[0013] Furthermore, there is a second gap between the outer surface of the first amplitude rod and the inner surface of the hollow locking rod.

[0014] Furthermore, one end of the hollow locking rod extends out of the housing from the mounting hole, and the ultrasonic vibration device also includes a pressure cap, which is located outside the housing and is securely connected to the hollow locking rod to clamp the piezoelectric transducer and provide a certain preload to the piezoelectric transducer.

[0015] In some embodiments, the rod portion of the first amplitude rod is a first type rod or a second type rod;

[0016] The second amplitude rod is a first-type rod or a second-type rod;

[0017] The amplitude-changing lever segment of the instrument is either a first-type lever or a second-type lever;

[0018] The first type of rod has a linearly decreasing outer diameter from one end to the other, and its shape is a straight cone; the second type of rod has a gradually increasing outer diameter from one end to the other, and its shape can be a multi-segment straight cone or a curved cone.

[0019] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0020] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0021] Figure 1 This is a schematic diagram of the piezoelectric vibration structure on a traditional medical device handle.

[0022] Figure 2 This is a schematic diagram of the structure of an ultrasonic vibration device according to some embodiments of this application;

[0023] Figure 3 This is a schematic diagram of the structure of the first amplitude transformer according to some embodiments of this application;

[0024] Figure 4 This is a schematic diagram of the structure of the instrument rod according to some embodiments of this application.

[0025] Figure 5 This is a schematic diagram of the hollow locking rod according to some embodiments of this application;

[0026] Figure 6This is a schematic diagram of the structure of an ultrasonic vibration device according to some other optional embodiments of this application;

[0027] Figure 7 This is a schematic diagram of the structure of an ultrasonic vibration device according to some embodiments of this application;

[0028] Figure 8 yes Figure 7 An assembly diagram of the first and second amplitude transformers in the illustrated embodiment;

[0029] Figure 9 This is a schematic diagram of the external shape of the first type of rod in some embodiments;

[0030] Figure 10(a) is a schematic diagram of the external shape of the second type rod with multiple straight tapered sections in some embodiments, and Figure 10(b) is a schematic diagram of the external shape of the second type rod with curved tapered surface in some embodiments.

[0031] Figure label:

[0032] Figure 1 In the middle: piezoelectric vibration structure 100', mass balance block 1', amplitude transformer 2', piezoelectric transducer 4', locking bolt 5';

[0033] In the remaining diagrams: Ultrasonic vibration device 100;

[0034] Housing 1, mounting cavity 11, mounting hole 12, handle connection part 13, rear opening 14;

[0035] First amplitude rod 2, first flange 23;

[0036] Instrument rod 3, built-in section 31, step positioning section 32, instrument amplitude transformer section 33;

[0037] Piezoelectric transducer 4;

[0038] Hollow locking rod 51, center hole 512, concave hole 513, locking nut 52, pressure cap 53;

[0039] Second amplitude rod 6, second flange 63;

[0040] First gap a1, second gap a2;

[0041] First type rod 91, second type rod 92;

[0042] Equipment Department 200. Detailed Implementation

[0043] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0044] In the description of this application, it should be understood that the terms "center," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," and "radial," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise stated, "a plurality of" means two or more.

[0045] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0046] An ultrasonic vibration device 100 with a built-in amplitude transformer according to an embodiment of this application is described below with reference to the accompanying drawings.

[0047] Reference Figure 2 The ultrasonic vibration device 100 with built-in amplitude transformer according to an embodiment of this application includes: a housing 1, a hollow locking rod 51, a first amplitude transformer 2, an instrument rod 3, and a piezoelectric transducer 4.

[0048] The housing 1 has an installation cavity 11 inside, a handle connection part 13 on the housing 1, and an installation hole 12 on the housing 1 that communicates with the installation cavity 11.

[0049] The hollow locking rod 51 is installed in the mounting cavity 11. One end of the hollow locking rod 51 is directly opposite the mounting hole 12 in the length direction. The hollow locking rod 51 has a central hole 512 provided along its length direction.

[0050] The piezoelectric transducer 4 is installed in the mounting cavity 11. The piezoelectric transducer 4 is arranged around the hollow locking rod 51, which fixes the piezoelectric transducer 4 in the housing 1.

[0051] The first amplitude rod 2 is installed in the central hole 512. One end of the first amplitude rod 2 is fixed to the hollow locking rod 51 in the length direction. At least a portion of the length of the first amplitude rod 2 is located in the space surrounded by the piezoelectric transducer 4.

[0052] The instrument rod 3 is directly or indirectly connected to the other end of the first amplitude rod 2 in the length direction. The instrument rod 3 housing 1 and the instrument working part 200 are located outside the housing 1 and are provided on the instrument rod 3.

[0053] In this application, the hollow locking rod 51 and the first amplitude rod 2 are aligned in length direction, for example, in Figure 2 In this design, both the hollow locking rod 51 and the first amplitude transformer 2 are long rods arranged in the front-to-back direction. For ease of description, the following explanation will use the example where the length direction of both the hollow locking rod 51 and the first amplitude transformer 2 is in the front-to-back direction. The side of the housing 1 facing the instrument working part 200 is referred to as the front side, and a mounting hole 11 is provided on the front side of the housing 1. The opposite side is referred to as the rear side. When using the ultrasonic vibration device 100 for teeth cleaning, the instrument working part 200 on the front side of the ultrasonic vibration device 100 is directly facing the teeth.

[0054] As is well known to those skilled in the art, the core component of the piezoelectric transducer 4 is a piezoelectric crystal. The piezoelectric crystal can deform under pressure, causing it to polarize and resulting in positive and negative bound charges on its surface; this effect is known as the piezoelectric effect. The piezoelectric effect is reversible; that is, applying a voltage to the piezoelectric crystal causes deformation, and this inverse piezoelectric effect can generate ultrasonic waves.

[0055] The first amplitude transformer 2 in this application is an ultrasonic amplitude transformer, which, as the name suggests, is a functional component that works with the transducer to change the amplitude of ultrasonic vibration. Its main function is to change the amplitude of the piezoelectric transducer 4, increase the vibration velocity ratio, improve efficiency, and enhance the mechanical quality factor. By installing the ultrasonic amplitude transformer, the load matching between the transducer and the working part 200 of the instrument is adjusted, reducing the resonant impedance and allowing it to operate at the resonant frequency, thus improving the electroacoustic conversion efficiency, effectively reducing the heat generated by the transducer, and extending its service life.

[0056] Therefore, when the ultrasonic vibration device 100 of this application is working, a voltage can be applied to the piezoelectric transducer 4, causing the piezoelectric transducer 4 to deform and vibrate, thereby generating ultrasonic waves. Since the hollow locking rod 51 locks the piezoelectric transducer 4 onto the housing 1, the driving power of the piezoelectric transducer 4 can be output through the rear end of the hollow locking rod 51.

[0057] The first amplitude transformer 2, connected to the rear end of the hollow locking rod 51, will further increase the amplitude under the action of ultrasound, thus amplifying the amplitude output by the first amplitude transformer 2. As a result, the instrument working part 200, connected to the front end of the first amplitude transformer 2, will generate strong vibration, improving its working performance.

[0058] In this application, by setting a housing 1, and providing a handle connecting part 13 on the housing 1 to connect the handle body, the weight of the housing 1 itself and the weight borne by the connection with the handle body make the housing 1 act as a mass balance block 1', thereby reducing the structural volume by eliminating the setting of the mass balance block 1'.

[0059] This application does not impose any restrictions on the shape of the first amplitude transformer 2; the first amplitude transformer 2 can be a round bar or a square bar. The radial and axial orientations defined herein are defined with reference to the instrument working part 200, the axis of which is taken as the axis of the ultrasonic vibration device 100, the direction along which is the axis is called the axial direction, and the direction perpendicular to the axis is called the radial direction.

[0060] Since the piezoelectric transducer 4 is located inside the housing 1 and surrounds the radial outer side of the first amplitude transformer 2, the housing 1, piezoelectric transducer 4, hollow locking rod 51 and the first amplitude transformer 2 are arranged radially, instead of the mass balance block 1', piezoelectric transducer 4' and first amplitude transformer 2' arranged in a straight line as used in the prior art. This radial arrangement of the present application is beneficial to significantly reduce the axial length of the ultrasonic vibration device 100, and saves space and facilitates miniaturization design.

[0061] It is understandable that ultrasound is a radiation wave, and the ultrasound energy in the area surrounded by the piezoelectric transducer 4 is relatively concentrated. Therefore, by surrounding the piezoelectric transducer 4 on the radial outside of the first amplitude transformer 2 in this application, the ultrasound energy received by the first amplitude transformer 2 can be increased, thereby increasing the amplitude under the action of ultrasound, ensuring that the working part of the instrument 200 can vibrate strongly and improving the energy utilization rate.

[0062] exist Figure 2 In some embodiments shown, the housing 1 has a mounting cavity 11, and the front side of the housing 1 has a mounting hole 12. The rear end of the mounting hole 12 communicates with the mounting cavity 11, so the first amplitude rod 2, the hollow locking rod 51, and the piezoelectric transducer 4 can all be disposed in the mounting cavity 11. Optionally, the rear side of the mounting cavity 11 is open, that is, the rear side of the housing 1 is provided with a rear opening 14 to facilitate the assembly of parts such as the first amplitude rod 2, the hollow locking rod 51, and the piezoelectric transducer 4.

[0063] In this application, the rear end of the first amplitude rod 2 is connected to the rear end of the hollow locking rod 51, and the front end of the first amplitude rod 2 is connected to the instrument working part 200. This reverse arrangement of the first amplitude rod 2 not only helps to shorten the overall axial length of the ultrasonic vibration device 100, but also allows the vibrations of the piezoelectric transducer 4, the hollow locking rod 51, the first amplitude rod 2, and the instrument working part 200 to be transmitted sequentially without interference between them, thus achieving a compact and miniaturized arrangement of parts.

[0064] In some embodiments, the piezoelectric transducer 4 may include multiple layers of piezoelectric wafers, each layer of piezoelectric wafers being arranged in a circular ring (or other ring) around the first amplitude transformer 2, and the multiple layers of piezoelectric wafers being stacked along the axial direction. Specifically, the piezoelectric wafers in each layer may form a circular ring (or other ring), or may include multiple block-shaped piezoelectric wafers sequentially spliced ​​into a circular ring (or other ring), without limitation.

[0065] How to connect and control the piezoelectric chip is common knowledge in existing technology and will not be elaborated here.

[0066] In some embodiments, such as Figure 2 and Figure 3 As shown, the first amplitude transformer 2 is a hollow rod, and the instrument rod 3 is a long rod housed inside the first amplitude transformer 2. For example, the instrument rod 3 is housed inside the first amplitude transformer 2 along its front-to-back direction. One end of the instrument rod 3 extends out of the first amplitude transformer 2 and from the mounting hole 12 of the housing 1. For example... Figure 2 In the middle, the front end of the instrument rod 3 extends out of the front end of the first amplitude rod 2, and the front end of the instrument rod 3 remains fixed to the front end of the first amplitude rod 2.

[0067] This arrangement, where at least a portion of the first amplitude transformer 2 and the instrument rod 3 are radially aligned, facilitates further shortening of the overall axial length of the ultrasonic vibration device 100. The first amplitude transformer 2 is a hollow rod with thinner walls, allowing ultrasound waves to easily penetrate. Furthermore, the reduced cross-sectional area of ​​the first amplitude transformer 2 makes it more prone to vibration under ultrasonic waves, thus increasing the vibration amplitude. This sleeve arrangement reduces the bending amplitude of the instrument rod 3 during vibration, preventing excessive deformation at the connection between the first amplitude transformer 2 and the instrument rod 3, which could lead to detachment and improve connection reliability.

[0068] Specifically, such as Figure 2 and Figure 4 As shown, the instrument rod 3 includes: an internal section 31 and a step positioning section 32. The internal section 31 is disposed inside the first amplitude rod 2, and the step positioning section 32 is connected to one end of the internal section 31 and located outside the first amplitude rod 2. The step positioning section 32 abuts against the rod end of the first amplitude rod 2.

[0069] like Figure 2 In the first amplitude transformer 2, the built-in section 31 is disposed within the first amplitude transformer 2 along the front-rear direction. The stepped positioning section 32 is connected to the front end of the built-in section 31 and is located on the front side of the first amplitude transformer 2, abutting against the front end surface of the first amplitude transformer 2. The step positioning section 32 facilitates positioning, increases the contact area between the instrument rod 3 and the first amplitude transformer 2, facilitates fixed connection, and improves the axial load-bearing capacity of the first amplitude transformer 2 on the instrument rod 3.

[0070] Furthermore, such as Figure 2As shown, the ultrasonic vibration device 100 also includes a locking nut 52, which is fitted on the radially outer side of the stepped positioning section 32 and locks the stepped positioning section 32 onto the first amplitude transformer 2. This not only further improves the connection reliability between the first amplitude transformer 2 and the instrument rod 3, but also makes it easy to disassemble and assemble the locking nut 52.

[0071] Of course, the solution proposed in this application is not limited to this. Other structures can also be used to fix the first amplitude rod 2 to the instrument rod 3. For example, the instrument rod 3 can be directly threaded onto the first amplitude rod 2, or the instrument rod 3 can be inserted into the first amplitude rod 2 and then fixed from the side with a positioning pin.

[0072] Specifically, such as Figure 2 As shown, the built-in segment 31 is coaxially arranged with the first amplitude transformer 2, and there is a first gap a1 between the outer surface of the built-in segment 31 and the inner surface of the first amplitude transformer 2. With this arrangement, the built-in segment 31 has a first gap a1 of relatively uniform thickness around its periphery, and the built-in segment 31 has a certain amount of bending movement space in the 360-degree direction.

[0073] In some embodiments, such as Figure 2 and Figure 4 As shown, the instrument lever 3 also includes an instrument amplitude-changing lever section 33, which is located outside the housing 1. The instrument working part 200 is rigidly connected to the instrument amplitude-changing lever section 33, as shown. Figure 1 The instrument working section 200 is connected to the front end of the instrument amplitude-changing rod section 33. As a result, the instrument amplitude-changing rod section 33 has an amplitude-changing function, and the vibration amplitude of the instrument working section 200 can be further amplified, thereby improving the working efficiency of the instrument working section 200.

[0074] In some specific embodiments, such as Figure 1 As shown, the hollow locking rod 51 has a central hole 512 arranged in the front-to-back direction. The first amplitude rod 2 is disposed in the central hole 512 of the hollow locking rod 51, and the rear end of the first amplitude rod 2 is rigidly connected to the rear end of the hollow locking rod 51. The rigid connection not only has high reliability, but also can advantageously transmit the vibration of the piezoelectric transducer 4 to the first amplitude rod 2.

[0075] Specifically, such as Figure 2 As shown, the hollow locking rod 51 has a recessed hole 513 at its end, and one end of the central hole 512 extends into the recessed hole 513. One end of the first amplitude rod 2 has a first flange 23 that fits into the recessed hole 513, and the first flange 23 is rigidly connected to the hollow locking rod 51. Using the fit between the first flange 23 and the recessed hole 513 to connect the first amplitude rod 2 and the hollow locking rod 51 not only provides a large contact area between them but also allows for bidirectional axial and radial limiting, thereby improving the connection's firmness and reliability, and facilitating vibration transmission.

[0076] Furthermore, such as Figure 2 As shown, there is a second gap a2 between the outer surface of the first amplitude rod 2 and the inner surface of the hollow locking rod 51. The setting of the second gap a2 allows the first amplitude rod 2 and the hollow locking rod 51 to be completely separated except for the rear end. This reduces mutual interference and friction when the two vibrate and deform, thus reducing friction loss.

[0077] Furthermore, such as Figure 2 As shown, the ultrasonic vibration device 100 also includes a pressure cap 53. One end of the hollow locking rod 51 extends out of the housing 1 from the mounting hole 12. The pressure cap 53 is located outside the housing 1 and is rigidly connected to the hollow locking rod 51 to clamp the piezoelectric transducer 4 and provide a certain preload to the piezoelectric transducer 4.

[0078] like Figure 2 In this configuration, the pressure cap 53 is located on the front side of the housing 1 and surrounds the mounting hole 12. The front end of the hollow locking rod 51 is connected to the pressure cap 53. That is, the pressure cap 53 blocks the front side of the piezoelectric transducer 4, and the hollow locking rod 51 blocks the rear side of the piezoelectric transducer 4. The hollow locking rod 51 passes through the mounting hole 12 of the housing 1, thereby locking the piezoelectric transducer 4 in the housing 1 through the hollow locking rod 51 and the pressure cap 53, improving the fixation and protection of the piezoelectric transducer 4.

[0079] In summary, as Figure 2 The ultrasonic vibration device 100 shown has a piezoelectric transducer 4 locked in the housing 1 by a hollow locking rod 51 and a pressure cap 53. Since the housing 1 is connected to the handle body through the handle connection part 13, and the housing 1 has a large mass, it can act as a mass counterweight.

[0080] During operation, when the piezoelectric transducer 4 is excited, it will generate a strong vibration at the rear end of the hollow locking rod 51. Since the first amplitude rod 2 is tightly and rigidly connected to the recess 513 on the hollow locking rod 51 through the first flange 23, it can drive the first amplitude rod 2 to vibrate together.

[0081] In use, the instrument rod 3 is installed in the first amplitude transformer 2 and locked with the locking nut 52, so that the stepped positioning section 32 of the instrument rod 3 is tightly connected to the front end of the first amplitude transformer 2. When the first amplitude transformer 2 vibrates, it drives the instrument rod 3 to vibrate together.

[0082] Because the front end of the step positioning section 32 of the instrument rod 3 is connected to the instrument amplitude transformer section 33, the vibration of the instrument working part 200 connected to the front of the instrument rod 3 is further amplified. The instrument rod 3 and the instrument working part 200 are rigidly connected.

[0083] In this application, the first amplitude lever 2 may be not limited to Figure 2 The hollow rod shown can also be like... Figure 6 The first amplitude rod 2 shown is a solid rod.

[0084] In this application, the first amplitude rod 2 can be directly connected to the instrument rod 3, or it can be indirectly connected to the instrument rod 3 through the second amplitude rod 6.

[0085] As in some embodiments, such as Figure 7 and Figure 8 As shown, the first amplitude transformer 2 is a hollow rod, and the second amplitude transformer 6 is installed inside the first amplitude transformer 2. At least a portion of the length of the second amplitude transformer 6 is located within the space surrounded by the piezoelectric transducer 4. The instrument rod 3 is connected to the first amplitude transformer 2 via the second amplitude transformer 6. The second amplitude transformer 6 can further increase the amplitude.

[0086] In this application, there is one second amplitude rod 6. The second amplitude rod 6 can be a solid rod or a hollow rod, and its two ends in the length direction are rigidly connected to the first amplitude rod 2 and the instrument rod 3, respectively.

[0087] Specifically, the second amplitude rod 6 has a second flange 63 at one end along its length, and the second flange 63 is rigidly connected to the end of the first amplitude rod 2. The second flange 63 not only increases the contact area of ​​the second amplitude rod 6, but also allows for bidirectional axial and radial limiting of the second amplitude rod 6, thereby improving the connection's firmness and reliability, and facilitating vibration transmission.

[0088] Specifically, the materials of the first amplitude rod 2, the second amplitude rod 6, and the instrument amplitude rod segment 33 are not limited in this application.

[0089] The cross-sectional shapes of the first amplitude rod 2, the second amplitude rod 6, and the instrument amplitude rod segment 33 are not limited in this application. For example, they can be conical, catenary, Gaussian, Fourier, or other shapes.

[0090] Specifically, the rod portion of the first amplitude lever 2 is a first-type lever 91 or a second-type lever 92, or a lever of other types.

[0091] Specifically, the rod portion of the second amplitude lever 6 is either the first type lever 91 or the second type lever 92, or another type of lever.

[0092] Specifically, the amplitude-changing lever segment 33 of the instrument is either the first type lever 91 or the second type lever 92, or other types of levers.

[0093] Here, as Figure 9 As shown, the outer diameter of the first-type rod 91 decreases linearly from one end to the other, and its shape is a straight cone, commonly known as a tapered rod. The intersection of the outer circumferential surface of the first-type rod 91 and its axial plane consists of two straight lines, and the distance between these two straight lines gradually decreases from one end to the other. Here, the axial plane refers to the plane passing through the axis.

[0094] Here, the outer diameter of the second-type rod 92 gradually decreases from one end to the other, as shown in Figure 10(a). The shape of the second-type rod 92 can be a multi-segment straight cone, or as shown in Figure 10(b), the shape of the second-type rod 92 is a curved cone. The intersection of the outer circumferential surface of the second-type rod 92 and its axial plane can be two broken lines or two curves. For example, each curve can be a parabola, etc.

[0095] By setting up this ultrasonic vibration device 100, it is beneficial to compact and miniaturized design, ensures efficient and large-amplitude vibration of the instrument working part 200, improves electroacoustic conversion efficiency, reduces the heat generation of the ultrasonic vibration device 100, and extends its service life.

[0096] In this application, the instrument working part 200 is not limited to any type, such as a root canal file, etc., forming a root canal preparation instrument for root canal treatment, etc.

[0097] In the description of this specification, the references to the terms "embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0098] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. An ultrasonic vibration device (100) with a built-in amplitude transformer, characterized in that, include: The housing (1) has an installation cavity (11) inside, a handle connection part (13) on the housing (1), and an installation hole (12) on the housing (1) that communicates with the installation cavity (11). Hollow locking rod (51) is installed in the mounting cavity (11). One end of the hollow locking rod (51) is directly opposite the mounting hole (12) in the length direction. The hollow locking rod (51) has a central hole (512) arranged in the length direction. A piezoelectric transducer (4) is installed in the mounting cavity (11). The piezoelectric transducer (4) is arranged around the hollow locking rod (51). The hollow locking rod (51) fixes the piezoelectric transducer (4) in the housing (1). The first amplitude rod (2) is installed in the center hole (512). One end of the first amplitude rod (2) is fixed on the hollow locking rod (51) in the length direction. At least a portion of the length of the first amplitude rod (2) is located in the space surrounded by the piezoelectric transducer (4). The first amplitude rod (2) is a hollow rod. The instrument rod (3) is directly or indirectly connected to the other end of the first amplitude rod (2) in the length direction, and the lower end of the instrument rod (3) is rigidly connected to the instrument working part (200). A second amplitude rod (6) is installed inside the first amplitude rod (2), and at least a portion of the length of the second amplitude rod (6) is located within the space surrounded by the piezoelectric transducer (4). The second amplitude rod (6) is fixedly connected to the first amplitude rod (2) at one end in the length direction and fixedly connected to the instrument rod (3) at the other end.

2. The ultrasonic vibration device (100) with a built-in amplitude transformer according to claim 1, characterized in that, The first amplitude rod (2) is a hollow rod, and the instrument rod (3) is set inside the first amplitude rod (2). One end of the instrument rod (3) extends out of the first amplitude rod (2) and extends out from the mounting hole (12).

3. The ultrasonic vibration device (100) with a built-in amplitude transformer according to claim 2, characterized in that, The instrument rod (3) includes: An internal section (31) is disposed within the first amplitude transformer (2); Step positioning section (32), the step positioning section (32) is connected to one end of the built-in section (31) and located outside the first amplitude rod (2), the step positioning section (32) abuts against the rod end of the first amplitude rod (2); The ultrasonic vibration device (100) further includes a locking nut (52), which is fitted on the radial outside of the step positioning section (32) and locks the step positioning section (32) onto the first amplitude rod (2).

4. The ultrasonic vibration device (100) with a built-in amplitude transformer according to claim 3, characterized in that, The built-in section (31) is coaxially arranged with the first amplitude rod (2), and there is a first gap (a1) between the outer surface of the built-in section (31) and the inner surface of the first amplitude rod (2).

5. The ultrasonic vibration device (100) with a built-in amplitude transformer according to claim 1, characterized in that, The instrument rod (3) also includes an instrument amplitude-changing rod section (33), which is located outside the housing (1), and the instrument working part (200) is rigidly connected to the instrument amplitude-changing rod section (33).

6. The ultrasonic vibration device (100) with a built-in amplitude transformer according to claim 1, characterized in that, The hollow locking rod (51) has a recessed hole (513) at its end, and one end of the central hole (512) extends to the recessed hole (513). One end of the first amplitude rod (2) is provided with a first flange (23) that fits in the recess (513), and the first flange (23) is rigidly connected to the hollow locking rod (51).

7. The ultrasonic vibration device (100) with a built-in amplitude transformer according to claim 1, characterized in that, The second amplitude rod (6) has a second flange (63) at one end in the length direction, and the second flange (63) is rigidly connected to the rod end of the first amplitude rod (2).

8. The ultrasonic vibration device (100) with a built-in amplitude transformer according to claim 1, characterized in that, There is a second gap (a2) between the outer surface of the first amplitude rod (2) and the inner surface of the hollow locking rod (51).

9. The ultrasonic vibration device (100) with a built-in amplitude transformer according to any one of claims 1-8, characterized in that, One end of the hollow locking rod (51) extends out of the housing (1) from the mounting hole (12). The ultrasonic vibration device (100) also includes a pressure cap (53), which is located outside the housing (1) and is fastened to the hollow locking rod (51) to clamp the piezoelectric transducer (4) and provide a certain preload to the piezoelectric transducer (4).

10. The ultrasonic vibration device (100) with a built-in amplitude transformer according to claim 5, characterized in that, The first amplitude rod (2) is a first type rod or a second type rod; The rod part of the second amplitude rod (6) is a first type rod or a second type rod; The amplitude-changing lever segment (33) of the instrument is a first-type lever or a second-type lever; The first type of rod has a linearly decreasing outer diameter from one end to the other and a straight conical shape; the second type of rod has a progressively decreasing outer diameter from one end to the other and a multi-segment straight conical or curved conical shape.

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