Ring array focused ultrasound transducer

Abstract

This utility model discloses a ring array focused ultrasound transducer, comprising: a housing, and a focused ultrasound assembly, which consists of a piezoelectric ceramic plate and several piezoelectric ceramic rings. The piezoelectric ceramic plate is located at the center, and each piezoelectric ceramic ring is sequentially fitted around the outer side of the piezoelectric ceramic plate. Insulating adhesive is filled into the gaps between the rings. A ring-shaped baffle is provided at the front port of the housing. The focused ultrasound assembly is fastened into the housing from back to front. The focusing point of the piezoelectric ceramic plate and each piezoelectric ceramic ring falls on the axis of the piezoelectric ceramic plate on the outer side of the front end of the housing. A cover plate is installed at the rear port of the housing. A vibration chamber is provided in the inner cavity of the housing between the cover plate and the focused ultrasound assembly. The piezoelectric ceramic plate and each piezoelectric ceramic ring are independently controlled. The ring array focused ultrasound transducer can change the focusing energy and achieve multi-focus or multi-frequency operation.

Description

Technical Field

[0001] This utility model relates to the field of focused ultrasound transducers, specifically to a ring array focused ultrasound transducer. Background Technology

[0002] The principle of high-intensity focused ultrasound (HIFU) therapy is to focus ultrasound waves and allow them to penetrate the body, destroying tumor tissue through a series of combined effects. Just as sunlight can be focused through a convex lens, ultrasound waves can also be focused and can safely penetrate the body. The low-energy-density ultrasound waves are concentrated at the tumor site, and the thermal effect at the focal point creates temperatures exceeding 60°C in the target area, causing protein denaturation and coagulative necrosis or irreversible severe damage to tissue cells, thereby achieving the goal of treating the tumor. The ultrasound transducer is the core component of the HIFU tumor therapy system, and its characteristics largely determine the effectiveness, safety, and efficiency of HIFU treatment. Most existing HIFU tumor therapy systems use single-point focusing ultrasound transducers composed of a single focusing piezoelectric ceramic plate. These are generally single-focus, single-frequency transducers. If the usage plan needs to be changed (such as changing the focus, frequency, or focusing energy), the ultrasound transducer needs to be replaced, which is cumbersome and frequent disassembly reduces the equipment's lifespan. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a ring array focused ultrasound transducer that can change the focusing energy and realize multiple focal points or multiple frequencies.

[0004] To solve the above problems, the technical solution adopted by this utility model is as follows: a ring array type focused ultrasound transducer, comprising: a shell, characterized in that: a focused ultrasound assembly is further provided, the focused ultrasound assembly being generally spherical, the focused ultrasound assembly being composed of a piezoelectric ceramic sheet and several piezoelectric ceramic rings, the piezoelectric ceramic sheet being spherical, each piezoelectric ceramic ring being an annular spherical shell, the piezoelectric ceramic sheet being located at the center, each piezoelectric ceramic ring being sequentially nested around the outer side of the piezoelectric ceramic sheet, an annular gap being left between the innermost piezoelectric ceramic ring and the piezoelectric ceramic sheet, and an annular gap being left between adjacent piezoelectric ceramic rings, each annular gap being filled with insulating glue, so that the piezoelectric ceramic sheet and each piezoelectric ceramic ring can be bonded together. Forming a whole, an annular baffle is provided in the front port of the housing. The focused ultrasound assembly is snapped into the housing from back to front until the outer edge of the focused ultrasound assembly abuts against the annular baffle. The concave surfaces of the piezoelectric ceramic sheet and each piezoelectric ceramic ring face the outer front of the housing, and the focusing point of the piezoelectric ceramic sheet and each piezoelectric ceramic ring falls on the axis of the piezoelectric ceramic sheet on the outer front of the housing. The focused ultrasound assembly and the housing are sealed and fixed with sealant. A cover plate is installed in the rear port of the housing. The cover plate and the housing are sealed and fixed with sealant. A vibration chamber is left in the inner cavity of the housing between the cover plate and the focused ultrasound assembly. The piezoelectric ceramic sheet and each piezoelectric ceramic ring are independently controlled.

[0005] Furthermore, in the aforementioned ring array focused ultrasound transducer: the convex surface of the piezoelectric ceramic sheet is the positive electrode, coated with a positive electrode silver paste layer; the concave surface of the piezoelectric ceramic sheet is the negative electrode, coated with a negative electrode silver paste layer; a negative electrode wiring area is provided at the edge of the convex surface of the piezoelectric ceramic sheet; a flanged silver paste strip is coated on the side wall of the piezoelectric ceramic sheet; the top of the flanged silver paste strip extends to the negative electrode wiring area; the end of the flanged silver paste strip is connected to the negative electrode silver paste layer; the flanged silver paste strip and the positive electrode silver paste layer do not contact each other; the positive electrode lead of the piezoelectric ceramic sheet is connected to the positive electrode silver paste layer; and the negative electrode lead of the piezoelectric ceramic sheet is connected to the top of the flanged silver paste strip.

[0006] Furthermore, in the aforementioned ring array focused ultrasound transducer: the convex surface of the piezoelectric ceramic ring is the positive electrode, coated with a positive electrode silver paste layer; the concave surface of the piezoelectric ceramic ring is the negative electrode, coated with a negative electrode silver paste layer; a negative electrode wiring area is provided on the convex surface of the piezoelectric ceramic ring; a flanged silver paste strip is coated on the side wall of the piezoelectric ceramic ring, the top of the flanged silver paste strip extends to the negative electrode wiring area, the end of the flanged silver paste strip is connected to the negative electrode silver paste layer, the flanged silver paste strip and the positive electrode silver paste layer do not contact each other; the positive electrode lead of the piezoelectric ceramic ring is connected to the positive electrode silver paste layer; and the negative electrode lead of the piezoelectric ceramic ring is connected to the top of the flanged silver paste strip.

[0007] Furthermore, in the aforementioned annular array focused ultrasound transducer, the size of the annular gap is not less than 3 mm.

[0008] Furthermore, in the aforementioned ring array focused ultrasound transducer, the cover plate is a PCB board, the electrode leads of the piezoelectric ceramic sheet and each piezoelectric ceramic ring are respectively connected to the inner end face of the PCB board, and the input wire is connected to the outer end face of the PCB board.

[0009] Furthermore, in the aforementioned ring array focused ultrasound transducer, the piezoelectric ceramic sheet and each piezoelectric ceramic ring have independent positive and negative leads, and small holes are left on the cover plate for the electrode leads of the piezoelectric ceramic sheet and each piezoelectric ceramic ring to pass through. Each small hole and the electrode lead are sealed with sealant.

[0010] The advantages of this invention are as follows: The ring array focused ultrasound transducer combines piezoelectric ceramic sheets and multiple piezoelectric ceramic rings into a ring array, and each piezoelectric ceramic sheet and each piezoelectric ceramic ring is independently controlled. By changing the focusing point and resonant frequency of the piezoelectric ceramic sheets and rings, the ultrasound transducer can achieve multiple focal points or multiple frequencies. Furthermore, by changing the number of working piezoelectric ceramic components, the focusing energy can be changed. For example, when using a transducer with multiple frequencies at the same focal point, the appropriate frequency can be selected for treatment according to the treatment site; when using a transducer with different focal points at the same frequency, the appropriate focal point can be selected for treatment according to the depth of the treatment site. Moreover, different focal points and different frequencies have wider applicability and can adapt to more treatment plans. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the ring array focused ultrasound transducer of this utility model, which achieves the same focal point and multiple frequencies.

[0012] Figure 2 This is a schematic diagram of the structure of the ring array focused ultrasound transducer of this utility model, which achieves multiple focal points and the same frequency.

[0013] Figure 3 This is a schematic diagram of the structure of the ring array focused ultrasound transducer of this utility model to achieve multiple focal points and multiple frequencies.

[0014] Figure 4 This is a schematic diagram of the ring array focused ultrasound transducer of this utility model, which achieves the same focal point and the same frequency.

[0015] Figure 5 This is a schematic diagram of the structure of the positive electrode silver paste layer, the negative electrode silver paste layer, and the flanged silver paste strip on the piezoelectric ceramic.

[0016] Figure 6 This is a top view of the piezoelectric ceramic sheet.

[0017] Figure 7 This is a top view of the piezoelectric ceramic ring. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0019] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the ring array focused ultrasound transducer includes: a housing 1, and a focused ultrasound assembly 2. The focused ultrasound assembly 2 is generally spherical, consisting of a piezoelectric ceramic plate 3 and six piezoelectric ceramic rings 4. The piezoelectric ceramic plate 3 is spherical, and each piezoelectric ceramic ring 4 is an annular spherical shell. The piezoelectric ceramic plate 3 is located at the center, and each piezoelectric ceramic ring 4 is sequentially nested around the outer side of the piezoelectric ceramic plate 3. An annular gap 5 is left between the innermost piezoelectric ceramic ring 4 and the piezoelectric ceramic plate 3, and an annular gap 5 is also left between adjacent piezoelectric ceramic rings 4. Each annular gap 5 is filled with insulating glue, so that the piezoelectric ceramic plate 3 and each piezoelectric ceramic ring 4 can be glued together to form a whole. An annular baffle 6 is provided in the front port of the housing 1. The focused ultrasound assembly 2 is arranged from the rear... The front is fastened into the outer shell 1 until the outer edge of the focused ultrasound assembly 2 abuts against the annular stop 6. The concave surfaces of the piezoelectric ceramic sheet 3 and each piezoelectric ceramic ring 4 face the outer front end of the outer shell 1, and the focusing point of the piezoelectric ceramic sheet 3 and each piezoelectric ceramic ring 4 falls on the axis of the piezoelectric ceramic sheet 3 on the outer front end of the outer shell 1. The focused ultrasound assembly 2 and the outer shell 1 are sealed and fixed with sealant. A cover plate 7 is installed in the rear port of the outer shell 1. The cover plate 7 and the outer shell 1 are sealed and fixed with sealant. A vibration chamber 8 is left in the inner cavity of the outer shell 1 between the cover plate 1 and the focused ultrasound assembly 3. The piezoelectric ceramic sheet 3 and each piezoelectric ceramic ring 4 are independently controlled. Since each piezoelectric ceramic is independently controlled, the focusing energy can be changed by changing the number of focusing points.

[0020] In this embodiment, as Figure 5 , Figure 6 , Figure 7 As shown, the convex surface of the piezoelectric ceramic sheet 3 is the positive electrode, and a positive electrode silver paste layer 9 is coated on it. The concave surface of the piezoelectric ceramic sheet 3 is the negative electrode, and a negative electrode silver paste layer 10 is coated on it. A negative electrode wiring area 12 is provided at the edge of the convex surface of the piezoelectric ceramic sheet 3. A flanged silver paste strip 11 is coated on the side wall of the piezoelectric ceramic sheet 3. The top end of the flanged silver paste strip 11 extends to the negative electrode wiring area 12. The end of the flanged silver paste strip 11 is connected to the negative electrode silver paste layer 10. The flanged silver paste strip 11 and the positive electrode silver paste layer 9 do not contact each other. The positive electrode lead of the piezoelectric ceramic sheet 3 is connected to the positive electrode silver paste layer 9, and the negative electrode lead of the piezoelectric ceramic sheet 3 is connected to the top end of the flanged silver paste strip 11.

[0021] The convex surface of the piezoelectric ceramic ring 4 is the positive electrode, and a positive electrode silver paste layer 9 is coated on it. The concave surface of the piezoelectric ceramic ring 4 is the negative electrode, and a negative electrode silver paste layer 10 is coated on it. A negative electrode wiring area 12 is provided on the convex surface of the piezoelectric ceramic ring 4. A flanged silver paste strip 11 is coated on the side wall of the piezoelectric ceramic ring 4. The top end of the flanged silver paste strip 11 extends to the negative electrode wiring area 12. The end of the flanged silver paste strip 11 is connected to the negative electrode silver paste layer 10. The flanged silver paste strip 11 and the positive electrode silver paste layer 9 do not contact each other. The positive electrode lead of the piezoelectric ceramic ring 4 is connected to the positive electrode silver paste layer 9, and the negative electrode lead of the piezoelectric ceramic ring 4 is connected to the top end of the flanged silver paste strip 11.

[0022] The size of the annular gap 5 is not less than 3mm. This setting can reduce the mutual influence of vibration between the piezoelectric ceramics. The piezoelectric ceramic sheet 3 and each piezoelectric ceramic ring 4 have independent positive and negative leads. Small holes are left on the cover plate 7 to allow the electrode leads of the piezoelectric ceramic sheet 3 and each piezoelectric ceramic ring 4 to pass through. The small holes and electrode leads are sealed with sealant.

[0023] In practical applications, the cover plate can also be a PCB board. The electrode leads of the piezoelectric ceramic sheet and each piezoelectric ceramic ring are connected to the inner end face of the PCB board, and the input wires are connected to the outer end face of the PCB board.

[0024] like Figure 1 As shown, the concave surfaces of the piezoelectric ceramic sheet 3 and the six piezoelectric ceramic rings 4 in this ring array focused ultrasound transducer have the same radius of curvature, making their focal points the same. The resonant frequency of the piezoelectric ceramic sheet 3 and the two adjacent piezoelectric ceramic rings 4 is 800KHz, the resonant frequency of the two middle piezoelectric ceramic rings 4 is 900KHz, and the resonant frequency of the two outer piezoelectric ceramic rings 4 is 1MHz. This ring array focused ultrasound transducer has one focal point and three frequencies.

[0025] like Figure 2 As shown, the piezoelectric ceramic sheet 3 and the concave surfaces of the two adjacent piezoelectric ceramic rings 4 in this ring array focused ultrasound transducer have the same radius of curvature, enabling them to focus on the first focal point. The concave surfaces of the two middle piezoelectric ceramic rings 4 have the same radius of curvature, enabling them to focus on the second focal point. The concave surfaces of the two outer piezoelectric ceramic rings 4 have the same radius of curvature, enabling them to focus on the third focal point. The resonant frequency of the piezoelectric ceramic sheet 3 and the six piezoelectric ceramic rings 4 is 800 kHz. This ring array focused ultrasound transducer has three focal points and one frequency.

[0026] like Figure 3As shown, the piezoelectric ceramic sheet 3 and the two adjacent piezoelectric ceramic rings 4 in this ring array focused ultrasound transducer have the same radius of curvature of their concave surfaces, enabling them to focus on the first focal point. The remaining four piezoelectric ceramic rings 4 have the same radius of curvature of their concave surfaces, enabling them to focus on the second focal point. The resonant frequency of the piezoelectric ceramic sheet 3 and the two adjacent piezoelectric ceramic rings 4 is 800 kHz, the resonant frequency of the two middle piezoelectric ceramic rings 4 is 900 kHz, and the resonant frequency of the two outer piezoelectric ceramic rings 4 is 1 MHz. This ring array focused ultrasound transducer has two focal points and three frequencies.

[0027] like Figure 4 As shown, the concave surfaces of the piezoelectric ceramic sheet 3 and the six piezoelectric ceramic rings 4 in this ring array focused ultrasound transducer have the same radius of curvature, making their focal points the same. The resonant frequencies of the piezoelectric ceramic sheet 3 and the six piezoelectric ceramic rings 4 are all 800KHz. Such a ring array focused ultrasound transducer has one focal point and one frequency.

Claims

1. A ring array type focused ultrasound transducer, including: The outer shell is characterized by further comprising a focused ultrasound assembly. The focused ultrasound assembly is spherically shaped, consisting of a piezoelectric ceramic sheet and several piezoelectric ceramic rings. The piezoelectric ceramic sheet is spherically shaped, and each piezoelectric ceramic ring is an annular spherical shell. The piezoelectric ceramic sheet is located at the center, and each piezoelectric ceramic ring is sequentially nested around the outer side of the piezoelectric ceramic sheet. An annular gap is left between the innermost piezoelectric ceramic ring and the piezoelectric ceramic sheet, and an annular gap is also left between adjacent piezoelectric ceramic rings. Each annular gap is filled with insulating adhesive, allowing the piezoelectric ceramic sheet and each piezoelectric ceramic ring to be bonded together to form a whole. An annular... The focused ultrasound assembly is snapped into the housing from back to front until the outer edge of the focused ultrasound assembly abuts against the annular retaining edge. The concave surfaces of the piezoelectric ceramic sheet and each piezoelectric ceramic ring face the outer front end of the housing, and the focusing point of the piezoelectric ceramic sheet and each piezoelectric ceramic ring falls on the axis of the piezoelectric ceramic sheet on the outer front end of the housing. The focused ultrasound assembly is sealed and fixed to the housing with sealant. A cover plate is installed in the rear port of the housing, and the cover plate is sealed and fixed to the housing with sealant. A vibration chamber is left in the inner cavity of the housing between the cover plate and the focused ultrasound assembly. The piezoelectric ceramic sheet and each piezoelectric ceramic ring are independently controlled.

2. The ring array focused ultrasound transducer according to claim 1, characterized in that: The convex side of the piezoelectric ceramic sheet is the positive electrode, coated with a positive electrode silver paste layer. The concave side of the piezoelectric ceramic sheet is the negative electrode, coated with a negative electrode silver paste layer. A negative electrode wiring area is provided at the edge of the convex side of the piezoelectric ceramic sheet. A flanged silver paste strip is coated on the side wall of the piezoelectric ceramic sheet, with the top of the flanged silver paste strip extending to the negative electrode wiring area and the end of the flanged silver paste strip connected to the negative electrode silver paste layer. The flanged silver paste strip and the positive electrode silver paste layer do not contact each other. The positive electrode lead of the piezoelectric ceramic sheet is connected to the positive electrode silver paste layer, and the negative electrode lead of the piezoelectric ceramic sheet is connected to the top of the flanged silver paste strip.

3. The ring array focused ultrasound transducer according to claim 2, characterized in that: The convex side of the piezoelectric ceramic ring is the positive electrode, coated with a positive electrode silver paste layer. The concave side of the piezoelectric ceramic ring is the negative electrode, coated with a negative electrode silver paste layer. A negative electrode wiring area is provided on the convex side of the piezoelectric ceramic ring. A flanged silver paste strip is coated on the side wall of the piezoelectric ceramic ring. The top of the flanged silver paste strip extends to the negative electrode wiring area, and the end of the flanged silver paste strip is connected to the negative electrode silver paste layer. The flanged silver paste strip and the positive electrode silver paste layer do not contact each other. The positive electrode lead of the piezoelectric ceramic ring is connected to the positive electrode silver paste layer, and the negative electrode lead of the piezoelectric ceramic ring is connected to the top of the flanged silver paste strip.

4. The ring array focused ultrasound transducer according to claim 1, 2, or 3, characterized in that: The size of the annular gap shall not be less than 3mm.

5. The ring array focused ultrasound transducer according to claim 1, 2, or 3, characterized in that: The cover plate is a PCB board. The electrode leads of the piezoelectric ceramic sheet and each piezoelectric ceramic ring are connected to the inner end face of the PCB board, and the input wires are connected to the outer end face of the PCB board.

6. The ring array focused ultrasound transducer according to claim 1, 2, or 3, characterized in that: Each piezoelectric ceramic sheet and each piezoelectric ceramic ring has an independent positive lead and a negative lead. Small holes are left on the cover plate for the electrode leads of the piezoelectric ceramic sheet and each piezoelectric ceramic ring to pass through. Each small hole and the electrode lead are sealed with sealant.

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