A piezoelectric ceramic ultrasonic transducer device and a manufacturing method thereof

Abstract

The present disclosure provides a piezoelectric ceramic ultrasonic transducer device. The device includes: a transducer device body, a first electrode and a second electrode, the transducer device body is configured as a tube body having an inner surface, an outer surface and a first and a second opening, and the tube body is composed of a piezoelectric ceramic having a certain thickness to form a tube wall; the first electrode is composed of a first conductive layer, wherein the first area of ​​the outer surface of the transducer device body is uniformly coated with a conductive material to form a first conductive layer; the second electrode is composed of a second conductive layer, a third conductive layer and a fourth conductive layer that are electrically connected to each other; wherein the first electrode and the second electrode are insulated from each other on the transducer device body. In addition, the present disclosure also relates to a method for making the device. Compared with conventional transducers, the device disclosed in the present disclosure has the advantages of simplifying the welding process and reducing the difficulty of welding, thereby improving the yield rate of welding wires, and making it possible to further reduce the overall outline size of the device.

Description

Technical Field

[0001] The present disclosure relates to the technical field of medical devices, and in particular to a piezoelectric ceramic ultrasonic transducer device and a manufacturing method thereof. Background Art

[0002] With the development of science and technology, ultrasonic transducers play an increasingly important role in biomedicine. Piezoelectric ceramic ultrasonic transducers can achieve energy conversion between electrical energy and mechanical energy through the inverse piezoelectric effect, thereby generating ultrasonic waves, and are the core components of medical ultrasonic equipment. Piezoelectric ceramic ultrasonic transducers use piezoelectric ceramics as the main material, and the inner and outer surfaces are plated with a metal conductive layer, which is the inner and outer electrodes. Usually, wires are welded to the inner and outer electrodes of the transducer, and an external power supply device is connected to form a power circuit.

[0003] The piezoelectric ceramic ultrasonic transducer devices currently used in the industry for intravascular ultrasonic ablation are relatively small in size. In order to evenly transmit ultrasonic waves in all directions within the blood vessel, welding the electrode wires, especially the wire welding of the electrodes on the inner surface of the transducer device, is very difficult and has a low yield rate.

[0004] In terms of clinical use, the product needs to ablate the nerves outside the blood vessel wall through tiny blood vessels, so the product needs to have the smallest possible intervention size. At the same time, the transducer needs to be able to continuously and stably generate ultrasound to ablate the targeted nerves, so the performance of the transducer after welding the wires must be stable, and the welding process and welding points will not have a significant impact on the performance of the transducer itself.

[0005] Therefore, how to make the outline size (or intervention size) of the ultrasonic transducer device after welding the wire as small as possible through structural and process design, so that the electrode welding wire process is easier and the performance of the transducer device after welding the wire is more stable is a technical problem that needs to be solved urgently. Summary of the invention

[0006] In order to solve at least one of the above problems and one or more of other potential problems, the present disclosure proposes a piezoelectric ceramic ultrasonic transducer device.

[0007] In a first aspect of the present disclosure, a piezoelectric ceramic ultrasonic transducer device is provided, the device comprising a transducer device body, a first electrode and a second electrode, wherein the transducer device body is configured as a tube body having an inner surface, an outer surface and a first opening and a second opening, the tube body is composed of a tube wall of a piezoelectric ceramic having a given thickness, and a first side end surface at the first opening of the tube body is composed of the tube wall, and a second side end surface at the second opening of the tube body is composed of the tube wall; the first electrode is composed of a first conductive layer, wherein a first area of ​​the outer surface of the transducer device body is uniformly coated with Conductive material is used to form the above-mentioned first conductive layer; the above-mentioned second electrode is composed of a second conductive layer, a third conductive layer and a fourth conductive layer that are electrically connected to each other, wherein the second area of ​​the outer surface of the above-mentioned transducer device body is uniformly coated with conductive material to form the above-mentioned second conductive layer, the inner surface of the above-mentioned transducer device body is uniformly coated with conductive material to form the above-mentioned third conductive layer, and part or all of the area on the above-mentioned first side end face or the above-mentioned second side end face is uniformly coated with conductive material to form the above-mentioned fourth conductive layer; wherein the above-mentioned first electrode and the above-mentioned second electrode are insulated from each other on the above-mentioned transducer device body.

[0008] Furthermore, the outer surface of the transducer device body is composed of the first region, the second region and the outer surface insulating region, and the outer surface insulating region can prevent the first conductive layer and the second conductive layer from forming an electrical connection on the outer surface of the transducer device body.

[0009] Furthermore, the first region is close to the distal end of the transducer device body, and the second region is close to the proximal end of the transducer device body.

[0010] Furthermore, the outer surface insulating region can surround or encircle the second region on the outer surface of the transducer device body, so that the outer surface insulating region can prevent the first conductive layer and the second conductive layer from forming an electrical connection on the outer surface of the transducer device body.

[0011] Furthermore, the outer surface insulating region can surround the outer circumference of the transducer device body on the outer surface of the transducer device body to form an annular structure to divide the first region and the second region, so that the outer surface insulating region can prevent the first conductive layer and the second conductive layer from forming an electrical connection on the outer surface of the transducer device body.

[0012] Further, on the outer surface of the energy conversion device body, the welding wire can be welded to the first conductive layer and / or the second conductive layer.

[0013] Furthermore, when part or all of the area on the second side end face is uniformly coated with conductive material, the second conductive layer and the third conductive layer are electrically connected via the second side end face uniformly coated with conductive material, and the first side end face can prevent the first conductive layer and the third conductive layer from being electrically connected on the first side end face of the transducer device body.

[0014] Furthermore, the tube body is configured as a cylindrical tube, a square cylindrical tube, a rectangular cylindrical tube, a triangular cylindrical tube, a rhombus cylindrical tube, or other polygonal cylindrical tubes.

[0015] Furthermore, the second conductive layer, the third conductive layer and the fourth conductive layer are electrically connected through connection of the coated conductive material.

[0016] In addition, in the second aspect of the present disclosure, a method for manufacturing the above-mentioned piezoelectric ceramic ultrasonic transducer device is provided, the method comprising: completely coating the entire surface of the above-mentioned transducer device body with a conductive material by sputtering; and removing the conductive material in the area other than the above-mentioned first electrode and the above-mentioned second electrode by a laser beam.

[0017] Compared with the prior art, the present disclosure has the following beneficial effects:

[0018] (1) Without relying on additional auxiliary support members or support structures to arrange the welding position of the electrode, the outer peripheral size of the tube body of the ultrasonic transducer device can be further reduced, thereby making the overall outline size (or intervention size) of the ultrasonic transducer device as small as possible.

[0019] (2) Compared with welding directly on the inner surface of the tubular electrode of a small-sized ultrasonic transducer device, welding on the outer surface of the tubular electrode can make the electrode welding wire process easier.

[0020] (3) Since it is difficult to weld directly on the inner surface of the tubular electrode of a small-sized ultrasonic transducer device, the performance of the transducer device after welding the wire is not stable enough. However, it is easier to set welding points on the outer surface of the tubular electrode, which makes the performance of the transducer device after welding the wire more stable and improves the overall yield rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other features, advantages and aspects of the embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. In the accompanying drawings, the same or similar reference numerals represent the same or similar elements, wherein:

[0022] Figure 1 A schematic diagram of a piezoelectric ceramic ultrasonic transducer device 100 according to some embodiments of the present disclosure is shown;

[0023] Figure 2 A schematic diagram showing a piezoelectric ceramic ultrasonic transducer device 200 according to a preferred embodiment of the present disclosure; and

[0024] Figure 3 A diagram showing a method 300 for manufacturing a piezoelectric ceramic ultrasonic transducer device in some embodiments of the present disclosure is shown. DETAILED DESCRIPTION

[0025] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as being limited to the embodiments described herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are only for exemplary purposes and are not intended to limit the scope of protection of the present disclosure.

[0026] In the description of the embodiments of the present disclosure, the term "including" and similar terms should be understood as open inclusion, that is, "including but not limited to". The term "based on" should be understood as "based at least in part on". The term "one embodiment" or "the embodiment" should be understood as "at least one embodiment". The terms "first", "second", etc. may refer to different or the same objects. Other explicit and implicit definitions may also be included below.

[0027] In addition, it should be noted that, in the description of the embodiments of the present application, unless otherwise clearly defined, "in vivo" means inside the tissues and organs of the patient, and "in vitro" means outside the tissues and organs of the patient. At the same time, in the embodiments of the present application, "distal" means the direction away from the physician, and "proximal" means the direction close to the physician.

[0028] At present, the mainstream ablation technologies include radiofrequency ablation technology and ultrasonic ablation technology. Among them, ultrasonic ablation technology is the main focus of this article. The existing technology mainly faces the following problems: 1) When welding electrode wires, especially the wire welding of the inner surface electrode of the transducer device is very difficult and the yield rate is low. 2) Secondly, a conductive metal support is coupled inside some transducers. The length of the support is longer than the transducer, and the end faces of the transducer are exposed at both ends. When welding the electrode wires, the inner electrode wires are directly welded to the part of the support that exposes the transducer. 3) This welding method of transferring the welding point to other components introduces the following additional problems: first, adding a support member to facilitate the welding point means increasing material costs; second, coupling a support member that performs the task of welding points inside the transducer device will increase the size of the support member, and then the intervention size of the entire transducer device will become larger or at least cannot be further reduced; in addition, the support member that performs the task of welding points generally needs to be rigid, and when the support member is rigidly coupled inside the transducer device, the metal plating (or coating layer) on the inner surface of the transducer may be scratched, which will affect the overall performance of the transducer device.

[0029] In order to solve at least one of the above problems, as well as one or more of other potential problems, the example embodiments of the present disclosure propose a piezoelectric ceramic ultrasonic transducer device to solve the problem that the wire welding of the inner surface electrode in the prior art is very difficult, the yield is low, and the performance of the transducer device after welding the wire is unstable, while the additional addition of internal auxiliary welding parts will result in the existing device solution being unable to further reduce the intervention size.

[0030] Figure 1 A schematic diagram of a piezoelectric ceramic ultrasonic transducer device 100 according to some embodiments of the present disclosure is shown. In the device 100 of this example, the main body includes: a transducer device body 110, a first electrode, and a second electrode, wherein the transducer device body 110 can be configured as a tube body having an inner surface 111, an outer surface 112, and a first opening 113 and a second opening 114, such a tube body structure has a certain thickness (for example, 0.25 mm), and the tube wall of such a tube body can be composed of a piezoelectric ceramic material. Further, the tube wall of the first opening 113 of the tube body can constitute a first side end surface 115, and the tube wall of the second opening 114 of the tube body can constitute a second side end surface 116. Further, the first area 112-1 of the outer surface 112 of the transducer body 110 is uniformly coated with a conductive material (for example, the entire first area is completely coated) to form a first conductive layer (particularly, when the uniformly coated conductive material covers the entire first area 112-1, the first conductive layer can cover the entire first area 112-1 of the outer surface 112 of the tube body, and therefore, the first conductive layer is no longer Figure 1), and then, the first conductive layer constitutes the first electrode. Further, the second area 112-2 of the outer surface 112 of the transducer body 110 is uniformly coated with a conductive material to constitute a second conductive layer (similarly, when the uniformly coated conductive material covers the entire second area 112-2, the second conductive layer can cover the entire second area 112-2 of the outer surface 112 of the tube body, so the second conductive layer is no longer Figure 1 Further, the inner surface 111 of the transducer body 110 is evenly coated with a conductive material to form a third conductive layer (correspondingly, when the evenly coated conductive material covers the entire inner surface 111, the third conductive layer can cover all areas of the inner surface 111 of the entire tube body, so the third conductive layer is no longer Figure 1 Further, the entire area of ​​the second side end surface 116 is uniformly coated with a conductive material to form a fourth conductive layer (similarly, when the uniformly coated conductive material covers the entire second side end surface 116, the fourth conductive layer can cover all areas of the second side end surface 116 of the entire tube body, so the fourth conductive layer is no longer Figure 1 ). It should be noted that a partial area of ​​the second side end surface 116 can also be uniformly coated with a conductive material to form a fourth conductive layer, as long as the fourth conductive layer formed by the coated area can electrically connect the aforementioned second conductive layer and the third conductive layer through the coated conductive material. Thus, the second electrode can be composed of a second conductive layer, a third conductive layer and a fourth conductive layer, and they are directly electrically connected to each other through the coated conductive material. Further, the first electrode and the second electrode are insulated from each other, especially on the outer surface 112 of the transducer body 110, there is an annular area that is not coated with a conductive material (for example, as shown in the figure, surrounding the outer periphery of the transducer body 110 (the tube body) with a given width), and the first side end surface 115 is also not coated with a conductive material, so that there is no area between the first electrode and the second electrode that is electrically connected through the coated conductive material. Specifically, by providing an area that is not coated with a conductive material on the outer surface 112 of the transducer body 110 (for example, an annular area surrounding the outer surface of the tube body, for example Figure 1In the example, the outer surface insulating region 112-5 blocks the conductive layer on the first region 112-1 and the conductive layer on the second region 112-2 from being electrically connected by coating conductive material on the outer surface 112, and the conductive layer on the first region 112-1 of the outer surface 112 cannot be electrically connected to the conductive layer on the inner surface 111 by coating conductive material via the first side end face 115. Thus, the conductive layer on the inner surface 111 is electrically connected to the conductive layer on the second region 112-2 of the outer surface 112 by coating conductive material on the side end face of the second opening 114 (i.e., forming a second electrode), and the conductive layer on the first region 112-1 of the outer surface 112 is separated by providing an insulating region of the annular region on the outer surface 112 and an insulating region on the side end face of the first opening 113 (i.e., forming a first electrode), so that the first electrode and the second electrode can simultaneously reserve welding point space on the outer surface 112 of the transducer device body 110.

[0031] In some alternative embodiments, the outer surface 112 of the transducer device body 110 is only composed of the first area 112-1, the second area 112-2 and the outer surface insulating area 112-5, and the outer surface insulating area 112-5 actually blocks the electrical connection between the first conductive layer and the second conductive layer formed by coating the conductive material on the outer surface 112 of the transducer device body 110. Thus, three independent areas are formed on the outer surface 112, which is convenient for setting welding points on the outer surface 112.

[0032] In some alternative embodiments, the first region 112-1 is close to the distal end of the transducer body 110 (i.e., away from the physician end), and the second region 112-2 is close to the proximal end of the transducer body 110 (i.e., close to the physician end), so that the first electrode is close to the distal end of the transducer body 110, and the area of ​​the second electrode on the outer surface 112 is closer to the proximal end of the transducer body 110, so that the electrode arrangement with the welding point close to the proximal end of the physician is more conducive to the arrangement of the welding point and the welding wire on the outer surface 112. Of course, in some alternative embodiments, the first region 112-1 can also be arranged close to the proximal end of the transducer body 110, and the second region 112-2 can be arranged close to the distal end of the transducer body 110.

[0033] In some alternative embodiments, the outer surface insulating region 112-5 can surround or encircle the second region 112-2 on the outer surface 112 of the transducer device body 110, so that the outer surface insulating region 112-5 can block the electrical connection between the first conductive layer and the second conductive layer formed by coating the conductive material on the outer surface 112 of the transducer device body 110. Thus, the electrical connection formed by coating the isolated conductive material on the outer surface 112 is formed by surrounding or encircling, so that the first electrode and the second electrode are mutually insulated on the outer surface 112.

[0034] In some alternative embodiments, the outer surface insulating region 112-5 can form an annular structure (for example, an annular structure region formed along the outer circumference of the outer surface 112 with a given circumferential width) on the outer surface 112 of the transducer device body 110 to separate the first region 112-1 and the second region 112-2, so that the outer surface insulating region 112-5 can prevent the first conductive layer and the second conductive layer from being electrically connected by coating the conductive material on the outer surface 112 of the transducer device body 110. Thus, the insulating ring formed in the form of an annular structure region can separate the outer surface 112 of the tube body of the transducer device body 110 into a region near the distal end (i.e., the first region 112-1) and a region near the proximal end (i.e., the second region 112-2), wherein a potential difference is generated between the first conductive layer formed after the first region 112-1 is completely and evenly coated with the conductive material and the third conductive layer formed after the inner surface 111 is completely and evenly coated with the conductive material, which acts on the piezoelectric ceramic, and then the piezoelectric ceramic emits more stable ultrasonic waves under the electric field of this structure. Then, according to the different frequencies, energy densities and other characteristics of ultrasound, it can be applied to different demand scenarios.

[0035] Furthermore, the welding wire can be welded to the first conductive layer (i.e., the first electrode) and / or the second conductive layer (i.e., the outer surface portion of the second electrode) on the outer surface 112 of the transducer body 110. Thus, setting the welding point in the outer surface 112 area is more conducive to the implementation of the welding process.

[0036] In some embodiments, when part or all of the second side end surface 116 is uniformly coated with conductive material, and the second conductive layer and the third conductive layer are electrically connected by uniformly coating part or all of the second side end surface 116 with conductive material, the first side end surface 115 is not coated with conductive material but can prevent the first conductive layer and the third conductive layer from being electrically connected on the first side end surface 115 of the transducer device body 110. Therefore, by coating the conductive material on the original tube wall and the outer surface of the tube body, the electrodes arranged on the inner surface are turned outward to the outer surface, so that there is no need to use additional support structures or additional accessory structures to provide welding points, thereby reducing the difficulty of process implementation to further reduce the size of the transducer device body; similarly, compared with the process of directly performing welding on the electrodes on the inner surface, the process difficulty of this embodiment is lower, and the stability of the device after welding is higher.

[0037] In some embodiments, the tubular structure of the transducer device body can be constructed into a cylindrical tube, a square tube, a rectangular cylindrical tube, a triangular cylindrical tube, a diamond cylindrical tube, or other polygonal cylindrical tubes. Of course, the most preferred is a cylindrical tube, which is most conducive to intervention in the human body and the best solution for emitting stable ultrasonic waves under the same volume.

[0038] It should be noted that, in some embodiments, the second conductive layer and the third conductive layer are electrically connected via the fourth conductive layer in a connection manner through the coated conductive material.

[0039] like Figure 1 As shown, the direction indicating portion may be an arrow mark. Of course, the above is only an example, and any pattern or structure that can mark a direction may be applicable to this embodiment. The above example does not constitute a limitation on the protection scope of the present invention.

[0040] Figure 2 A schematic diagram of a piezoelectric ceramic ultrasonic transducer device 200 according to a preferred embodiment of the present disclosure is shown. In the diagram, the first area has been completely coated with a conductive material to form a corresponding first conductive layer 212-1-1. Correspondingly, the second area has been completely coated with a conductive material to form a corresponding second conductive layer 212-2-2; all areas of the inner surface 211 have been completely coated with a conductive material to form a corresponding third conductive layer 211-1-3; all areas of the second side end surface 216 have been completely coated with a conductive material to form a corresponding fourth conductive layer 216-1-4. Such a coating method is selected because the process of coating all surfaces of the entire tube body as a whole is simpler than limiting specific areas to uniformly coat the conductive material. After the entire surface of the tube body is completely coated, all conductive materials on the surface of the first side end surface 215 mentioned above are removed by a laser beam, and the corresponding outer surface insulating area is formed by laser beam removal, which is simpler.

[0041] Figure 3 A diagram showing a method for manufacturing a piezoelectric ceramic ultrasonic transducer device in some embodiments of the present disclosure is shown. In this exemplary embodiment, the method for manufacturing the above-mentioned piezoelectric ceramic ultrasonic transducer device includes the following steps: in step 310, the entire surface of the transducer body is completely coated with a conductive material by sputtering (it should be noted that such coating should be uniformly coated with the conductive material, so that the inner and outer surfaces and the left and right side end faces of the entire piezoelectric ceramic of the tube structure are coated with the conductive material); further, in step 320, a laser beam is used to remove the conductive material coating of the area outside the first electrode and the second electrode, and then an insulating area between the first electrode and the second electrode is formed, for example, it can be an outer surface insulating area that is itself in the outer surface area, or it can be a side end face at the far end or the near end. By coating the conductive material and then removing it with a laser beam, it is simpler to implement and has a lower implementation cost than coating in a specified area at the current process level. More preferably, before executing the above step 320, it is necessary to first use a physical contact type annular clamp to clamp the above reserved outer surface insulation area and tighten it, and then perform laser beam removal on the conductive material coated on the first end side (distal side). More preferably, before executing the above step 320, the above physical contact type annular clamp is clamped near the middle of the reserved outer surface insulation area (which can be called the clamping area), and then the clamping part is guided to perform laser beam removal near the clamping part, so that the conductive material in a certain area outside the clamping area is removed, thereby forming the final outer surface insulation area, thereby uniformly coating the conductive material while solving the problem of how to support the above ultrasonic transducer device in the laser beam removal process step. In an alternative embodiment, before step 310, the above ultrasonic transducer device is first clamped and fixed by a physical contact type annular clamp, and then the conductive material is coated on the entire surface of the device. After completion, a certain area of ​​the clamping area is not coated with the conductive material and the outer surface insulation area is formed. In another alternative embodiment, before step 310, the ultrasonic transducer device is clamped and fixed by a physical contact annular clamp, and then the conductive material is coated on the entire surface of the device. When completed, the conductive material coated on the first end side (distal side) is first removed by a laser beam, and a certain area of ​​the clamping area is not coated with the conductive material and forms an outer surface insulation area, thereby obtaining the ultrasonic transducer device body in the electrode arrangement form of the above embodiments.

[0042] In a most preferred embodiment, a piezoelectric ceramic ultrasonic transducer device is provided, comprising a transducer device body, a first electrode and a second electrode, wherein the transducer device body is configured as a tube body having an inner surface, an outer surface and a first opening and a second opening, and the tube body preferably has an inner diameter to outer diameter ratio of 0.6-0.8, and more preferably a ratio of 0.7, such an inner and outer diameter ratio can effectively improve the ultrasonic transmission stability of the piezoelectric ceramic ultrasonic transducer device; preferably, the tube body is composed of a tube wall of a piezoelectric ceramic with a given thickness (for example, 0.5 mm), and a first side end surface is formed by the tube wall at the first opening of the tube body, and a second side end surface is formed by a tube wall of a given thickness at the second opening of the tube body, wherein preferably, the first and second side end surfaces are flat The outer surface of the transducer body is divided into a first area close to the distal end and starting from the distal end, and the entire surface of the first area is evenly coated with a conductive material to form a first conductive layer, and then the first conductive layer forms a first electrode; further, the outer surface of the transducer body is divided into a second area close to the proximal end and starting from the proximal end, and the entire surface of the second area is evenly coated with a conductive material to form a second conductive layer, and the entire area of ​​the inner surface of the transducer body is also evenly coated with a conductive material to form a third conductive layer, and the entire area on the side end surface of the proximal end is evenly coated with a conductive material to form a fourth conductive layer, thereby mutually coated by surface coating with conductive materials. The electrically connected second conductive layer, third conductive layer and fourth conductive layer constitute a second electrode, and the second electrode is also called the inner surface electrode (third conductive layer) and the everted electrode (second conductive layer). In order not to affect the ultrasonic transmission performance of the piezoelectric ceramic ultrasonic transducer, it is necessary to pay attention to controlling the ratio of the first area to the second area. Preferably, it is maintained greater than or equal to 3:1 in the axial dimension, that is, the surface area ratio is maintained greater than or equal to 9:1, and in order to ensure the accommodating welding point function of the everted electrode, the axial length of the second area should not be less than 1.5mm. It should be noted that in order to ensure that the first electrode and the second electrode are insulated from each other on the main body of the transducer, especially on its outer surface, an insulating area needs to be provided between the first electrode and the second electrode. Domain, preferably, an outer surface insulating area is provided on the outer surface of the transducer body to separate the first area and the second area. More preferably, the outer surface insulating area is on the outer surface of the transducer body at the boundary of the first area and the second area, and can surround the tube body along the circumference of the tube body to form an annular structure and just divide the first area and the second area. Since the outer surface insulating area only plays the role of dividing insulation, but the performance must be taken into account, the axial width of the outer surface insulating area is as small as possible, but in some embodiments, it must play the role of clamping and supporting the entire transducer body. Therefore, it cannot be less than 3% of the tube length of the entire transducer body, preferably 5%, but in order not to affect the performance of the transducer, it should not exceed 7% of the tube length of the first area.It should also be noted that, except for the outer surface insulating area, if the third conductive layer is on the proximal end face, the surface of the distal end face cannot be coated with conductive material sufficient to electrically connect the second conductive layer and the first conductive layer, that is, the first electrode and the second electrode cannot be electrically connected through the distal end face by coating the conductive material.

[0043] The embodiments of the present disclosure have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

[0044] The above description is only an optional embodiment of the present disclosure and is not intended to limit the present disclosure. For those skilled in the art, the present disclosure may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A piezoelectric ceramic ultrasonic transducer device, comprising a transducer device body, a first electrode and a second electrode, It is characterized in that The transducer device body is configured as a tube body having an inner surface, an outer surface and a first opening and a second opening, wherein the tube body is formed of a tube wall made of a piezoelectric ceramic having a given thickness, and a first side end surface is formed of the tube wall at the first opening of the tube body, and a second side end surface is formed of the tube wall at the second opening of the tube body; The first electrode is composed of a first conductive layer, wherein a first area of ​​the outer surface of the transducer device body is uniformly coated with a conductive material to form the first conductive layer; The second electrode is composed of a second conductive layer, a third conductive layer and a fourth conductive layer which are electrically connected to each other, wherein a second area of ​​the outer surface of the transducer device body is uniformly coated with a conductive material to form the second conductive layer, an inner surface of the transducer device body is uniformly coated with a conductive material to form the third conductive layer, and a part or all of an area on the first side end surface or the second side end surface is uniformly coated with a conductive material to form the fourth conductive layer; The first electrode and the second electrode are insulated from each other on the main body of the transducer device.

2. The device according to claim 1, It is characterized in that The outer surface of the transducer device body is composed of the first area, the second area and an outer surface insulating area, and the outer surface insulating area can prevent the first conductive layer and the second conductive layer from forming an electrical connection on the outer surface of the transducer device body.

3. The device according to claim 2, It is characterized in that The first region is close to the distal end of the transducer device body, and the second region is close to the proximal end of the transducer device body.

4. The device according to claim 2, It is characterized in that The outer surface insulating region can surround or encircle the second region on the outer surface of the transducer device body, so that the outer surface insulating region can prevent the first conductive layer and the second conductive layer from being electrically connected to each other on the outer surface of the transducer device body.

5. The device according to claim 2, It is characterized in that The outer surface insulating area can surround the outer circumference of the transducer device body on the outer surface of the transducer device body to form an annular structure to divide the first area and the second area, so that the outer surface insulating area can prevent the first conductive layer and the second conductive layer from forming an electrical connection on the outer surface of the transducer device body.

6. The device according to claim 2, It is characterized in that On the outer surface of the transducer device body, welding wires can be welded to the first conductive layer and / or the second conductive layer.

7. The device according to claim 1, It is characterized in that When part or all of the area on the second side end surface is uniformly coated with conductive material, the second conductive layer and the third conductive layer are electrically connected via the second side end surface uniformly coated with conductive material, and the first side end surface can prevent the first conductive layer and the third conductive layer from being electrically connected on the first side end surface of the transducer device body.

8. The device according to claim 1, It is characterized in that The tube body is configured as a cylindrical tube, a square cylindrical tube, a rectangular cylindrical tube, a triangular cylindrical tube, a diamond cylindrical tube, or other polygonal cylindrical tubes.

9. The device according to claim 1, It is characterized in that The second conductive layer, the third conductive layer and the fourth conductive layer are electrically connected through the connection of the coated conductive material.

10. A method for manufacturing the piezoelectric ceramic ultrasonic transducer device according to any one of claims 1 to 9, It is characterized in that include: The entire surface of the transducer device body is completely coated with a conductive material by sputtering; The conductive material constituting the regions other than the first electrode and the second electrode is removed using a laser beam.

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