Ultrasonic scalpel transducer

Abstract

The application relates to the technical field of medical devices, and discloses an ultrasonic knife transducer, which comprises a piezoelectric crystal stack, a first cover plate comprising a first abutting portion and a first cylindrical section, the first cylindrical section being connected with the first abutting portion, and the first abutting portion being adapted to abut against one axial end of the piezoelectric crystal stack; a second cover plate comprising a second abutting portion and a second cylindrical section, the second cylindrical section being connected with the second abutting portion, and the second abutting portion being adapted to abut against the other axial end of the piezoelectric crystal stack; the diameters of the first abutting portion and the second abutting portion are D1, D1 satisfies D1=d, the diameters of the first cylindrical section and / or the second cylindrical section are D2, D2 satisfies D2>d, wherein d is the diameter of the piezoelectric crystal stack. The ultrasonic knife transducer provided by the application can ensure better acoustic characteristics and heat conduction effect of the ultrasonic knife transducer under the premise of ensuring the acoustic characteristics of the ultrasonic knife transducer, and can quickly dissipate the heat at the front end of the ultrasonic knife.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to an ultrasonic scalpel transducer. Background Technology

[0002] Energy surgical instruments are currently the most widely used surgical solution in minimally invasive surgery. They are mainly used for the freeing, cutting, and hemostasis of tissues, fat, and lymph nodes, providing a combined cutting and hemostasis effect. The main energy surgical instruments currently include ultrasonic cutting hemostatic knives, high-frequency electrosurgical units, and plasma knives. Among these, ultrasonic cutting hemostatic knives are currently the fastest growing and most promising technology both domestically and globally.

[0003] The ultrasonic cutting hemostatic knife utilizes the piezoelectric effect of piezoelectric ceramics to convert electrical energy into mechanical vibration energy of 30KHz-80KHz, which is then transmitted to the tip of the amplitude transformer. The tip comes into contact with the tissue and rubs against it. Under the principle of cell cavitation, the cells separate and coagulate, thus achieving the effect of cutting and stopping bleeding.

[0004] The transducer plays a crucial role in ultrasonic cutting hemostatic knives; the frequency and amplitude of the titanium alloy rod tip originate from the transducer. The quality of the transducer's vibration characteristics directly determines the vibration characteristics of the titanium alloy rod.

[0005] However, the transducers of existing ultrasonic cutting hemostatic knives have high impedance, resulting in high power consumption, significant heat generation, and poor heat dissipation. Summary of the Invention

[0006] In view of this, the present invention provides an ultrasonic scalpel transducer to solve the problems of significant heat generation and poor heat dissipation performance of existing ultrasonic cutting hemostatic scalpel transducers during use.

[0007] This invention provides an ultrasonic scalpel transducer, comprising:

[0008] piezoelectric crystal stack;

[0009] A first cover plate is disposed at one axial end of the piezoelectric crystal stack. The first cover plate includes a first abutting portion and a first cylindrical section, the first cylindrical section being connected to the first abutting portion, and the first abutting portion being adapted to abut against one axial end of the piezoelectric crystal stack.

[0010] The second cover plate is disposed at one end of the piezoelectric crystal stack away from the first cover plate along the axial direction; the second cover plate includes a second abutting part and a second cylindrical section, the second cylindrical section is connected to the second abutting part, and the second abutting part is adapted to abut against the other end of the piezoelectric crystal stack along the axial direction.

[0011] The diameters of the first and second contact parts are D1, where D1 = d, and the diameters of the first cylindrical segment and / or the second cylindrical segment are D2, where D2 > d, and d is the diameter of the piezoelectric crystal stack.

[0012] Beneficial effects: The ultrasonic scalpel transducer provided by the present invention has a first abutment portion and a first cylindrical segment connected to the first abutment portion at one end of the first cover plate along the axial direction near the piezoelectric crystal stack, and a second abutment portion and a second cylindrical segment at one end of the second cover plate along the axial direction near the piezoelectric crystal stack. This ensures that the first abutment portion and the second abutment portion are completely abutted and fitted to both ends of the piezoelectric crystal stack, thereby ensuring the heat conduction effect between the piezoelectric crystal stack and the first and second cover plates. The diameters of the first and second abutment portions are equal to the diameter of the piezoelectric crystal stack, and the diameters of the first and second cylindrical segments are larger than the diameter of the piezoelectric crystal stack. This increases the heat conduction area and improves the heat dissipation performance of the first and second cylindrical segments while ensuring the acoustic characteristics of the ultrasonic scalpel transducer, thus ensuring better acoustic characteristics and heat conduction effect of the ultrasonic scalpel transducer and more quickly dispersing the heat at the tip of the ultrasonic scalpel.

[0013] In one alternative implementation, the diameter D2 of the first cylindrical segment and / or the second cylindrical segment also satisfies D2≤1.35·d.

[0014] Beneficial effects: By satisfying d<D2≤1.35·d, the diameter D2 of the first cylindrical segment and / or the second cylindrical segment can increase the heat conduction area, ensure better heat conduction of the ultrasonic scalpel transducer, and more quickly disperse the heat at the tip of the ultrasonic scalpel. On the other hand, it helps to reduce the overall weight of the scalpel head and avoids operator fatigue during clinical surgery.

[0015] In one alternative embodiment, the first cover plate further includes:

[0016] The tabletop section is located at the end of the first cylindrical section that is axially away from the first abutment portion;

[0017] A spherical segment is positioned between the tabletop segment and the first cylindrical segment, and the spherical segment is suitable for smoothly transitioning the tabletop segment and the first cylindrical segment.

[0018] The third cylindrical section is located at the end of the table section away from the spherical section along the axial direction. The third cylindrical section is suitable for forming a multi-composite structure with the table section, the spherical section, the first cylindrical section, and the first abutment portion.

[0019] Beneficial effects: The first cover plate, by sequentially arranging a first cylindrical segment, a spherical segment, a mesa segment, and a third cylindrical segment along the axial direction, forms an overall multi-layered composite structure of first cylindrical segment-spherical segment-mesa segment-third cylindrical segment. On the one hand, this allows the overall length of the structure to be balanced with the transducer's resonant frequency, ensuring better resonance characteristics while optimizing weight and guaranteeing the transducer's resonance effect; on the other hand, it ensures sufficient gain while maintaining the two resonant frequencies F of the ultrasonic scalpel transducer. p -F s ≥1000Hz, where F pFor the parallel resonant frequency, F s The series resonant frequency makes it easier to adapt the ultrasonic scalpel transducer to the host, greatly reducing the difficulty of the host driving and controlling the transducer under complex working conditions, while improving the working efficiency of the transducer.

[0020] In one optional embodiment, the diameter of the end face of the platform section near the first abutment part along the axial direction is D3, and D3 satisfies 1 / 2·d≤D3≤3 / 4·d;

[0021] The diameter of the end face of the platform segment away from the first abutment part along the axial direction and / or the diameter of the third cylindrical segment is D4, where D4 satisfies 1 / 3·d≤D4≤1 / 2·d.

[0022] Beneficial effects: The end face diameter D3 of the platform segment near the first abutment part along the axial direction satisfies 1 / 2·d≤D3≤3 / 4·d. At the same time, the end face diameter of the platform segment 24 away from the first abutment part along the axial direction and / or the diameter D4 of the third cylindrical segment satisfies 1 / 3·d≤D4≤1 / 2·d. On the one hand, it can avoid the generation of spurious frequencies, avoid unstable or abnormal vibration modes, and ensure sufficient vibration output. On the other hand, it can reduce the overall weight of the entire ultrasonic scalpel transducer and scalpel head, avoiding operator fatigue during clinical surgery. Furthermore, it can maintain the overall configuration of the multi-composite structure of the first cylindrical segment-spherical segment-platform segment-third cylindrical segment, ensuring better resonance characteristics while optimizing weight. This greatly reduces the difficulty of the host driving and controlling the transducer under complex working conditions, while improving the working efficiency of the transducer.

[0023] In one alternative embodiment, the ultrasonic scalpel transducer further includes a pre-tightening screw disposed at one end of the second cover plate axially away from the piezoelectric crystal stack, the pre-tightening screw being adapted to fix the first cover plate, the piezoelectric crystal stack, and the second cover plate.

[0024] In one alternative embodiment, both the first cover plate and the second cover plate are made of aluminum alloy.

[0025] The preload screw is made of titanium alloy.

[0026] Beneficial effects: Both the first and second cover plates are made of aluminum alloy. Compared with stainless steel cover plates, this not only reduces the overall weight of the ultrasonic transducer while ensuring its acoustic transmission efficiency, but also enhances the thermal conductivity of the first and second cover plates. Meanwhile, the preload screw is made of titanium alloy. Titanium alloy has high modulus, low density, and high strength, ensuring excellent acoustic properties while possessing the mechanical properties of stainless steel, and is also lighter than stainless steel.

[0027] In one optional embodiment, the first cover plate has a threaded hole at one end axially close to the piezoelectric crystal stack, the second cover plate has a first through hole axially, the piezoelectric crystal stack has a second through hole axially, and the threaded hole is coaxially arranged with the first through hole and the second through hole.

[0028] The axial end of the preload screw is provided with a threaded part, and the axial end of the preload screw is adapted to pass through the first through hole and the second through hole so that the threaded part is threadedly connected to the threaded hole.

[0029] Beneficial effects: By opening a threaded hole at one end of the first cover plate close to the piezoelectric crystal stack along the axial direction, and setting a threaded part at one end of the pre-tightening screw along the axial direction, the threaded part is threadedly connected to the threaded hole, so that the two ends of the piezoelectric crystal stack along the axial direction are completely and tightly fitted with the first abutment part and the second abutment part respectively.

[0030] In one optional embodiment, a first clamping part is provided on the outer peripheral wall of the first cylindrical section and the second cylindrical section; a second clamping part is provided on the screw head of the pre-tightening screw, and the first clamping part and the second clamping part are adapted to be clamped by tooling.

[0031] Beneficial effects: By setting the first clamping part and the second clamping part, the tooling can stably clamp the first clamping part and the second clamping part respectively during the assembly process, thereby facilitating the threaded part to be threadedly connected to the threaded hole and avoiding damage to the surface of the first cover plate and the second cover plate.

[0032] In one optional embodiment, the piezoelectric stack includes a plurality of piezoelectric ceramic sheets and a plurality of electrode sheets, wherein the electrode sheets are disposed on at least one side of the piezoelectric ceramic sheets along the axial direction and are attached to the piezoelectric ceramic sheets.

[0033] Beneficial effects: The ultrasonic scalpel transducer provided by this invention has an overall structure of four piezoelectric ceramic plates in half wavelength, which ensures that the capacitance of the ultrasonic scalpel transducer is consistent with that of the gun-type transducer. This allows the host to be adapted to the ultrasonic scalpel transducer without any difference, which helps to reduce the difficulty of host upgrade and development. Attached Figure Description

[0034] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0035] Figure 1 This is a front view of an ultrasonic scalpel transducer according to an embodiment of the present invention;

[0036] Figure 2 for Figure 1 A schematic diagram showing the dimensions of the first cover plate of the ultrasonic scalpel transducer;

[0037] Figure 3 for Figure 1 A schematic diagram showing the dimensions of the second cover plate of the ultrasonic scalpel transducer;

[0038] Figure 4 for Figure 1 Schematic diagram of the cross-sectional structure at section AA;

[0039] Figure 5 This is an assembly diagram of an ultrasonic scalpel transducer according to an embodiment of the present invention;

[0040] Figure 6 This is a three-dimensional structural diagram of an ultrasonic scalpel transducer according to an embodiment of the present invention.

[0041] Explanation of reference numerals in the attached figures:

[0042] 10. Piezoelectric crystal stack; 101. Second through hole; 11. Piezoelectric ceramic sheet; 12. Electrode sheet;

[0043] 20. First cover plate; 201. Threaded hole; 21. First abutment part; 22. First cylindrical section; 23. Spherical section; 24. Table section; 25. Third cylindrical section;

[0044] 30. Second cover plate; 301. First through hole; 31. Second abutment part; 32. Second cylindrical section; 33. First clamping part;

[0045] 40. Preload screw; 41. Threaded part; 42. Second clamping part. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] The following is combined Figures 1 to 6 The following describes embodiments of the present invention.

[0048] According to an embodiment of the present invention, an ultrasonic scalpel transducer is provided, comprising:

[0049] 10 piezoelectric crystal stacks;

[0050] The first cover plate 20 is disposed at one axial end of the piezoelectric crystal stack 10; please combine them together. Figure 1 and Figure 2 As shown, the first cover plate 20 includes a first abutting portion 21 and a first cylindrical section 22. The first cylindrical section 22 is connected to the first abutting portion 21, and the first abutting portion 21 is adapted to abut against one axial end of the piezoelectric crystal stack 10.

[0051] The second cover plate 30 is disposed at the end of the piezoelectric crystal stack 10 away from the first cover plate 20 along the axial direction; please combine them together. Figure 1 and Figure 3 As shown, the second cover plate 30 includes a second abutment portion 31 and a second cylindrical section 32. The second cylindrical section 32 is connected to the second abutment portion 31, and the second abutment portion 31 is adapted to abut against the other axial end of the piezoelectric crystal stack 10.

[0052] The diameters of the first contact portion 21 and the second contact portion 31 are D1, where D1 satisfies D1=d, and the diameters of the first cylindrical segment 22 and / or the second cylindrical segment 32 are D2, where D2 satisfies D2>d, where d is the diameter of the piezoelectric crystal stack 10.

[0053] The ultrasonic scalpel transducer provided by the present invention comprises a first abutment portion 21 and a first cylindrical section 22 connected to the first abutment portion 21 at one end of the first cover plate 20 along the axial direction near the piezoelectric crystal stack 10, and a second abutment portion 31 and a second cylindrical section 32 at one end of the second cover plate 30 along the axial direction near the piezoelectric crystal stack 10, such that the first abutment portion 21 and the second abutment portion 31 are completely abutted and fitted with the two ends of the piezoelectric crystal stack 10 respectively, thereby ensuring that the piezoelectric crystal stack 10 and the first cover plate 20 are in close contact. The thermal conductivity between the first contact portion 21 and the second contact portion 31 is equal to the diameter of the piezoelectric crystal stack 10, and the diameter of the first cylindrical section 22 and the second cylindrical section 32 is greater than the diameter of the piezoelectric crystal stack 10. This increases the thermal conductivity area and improves the heat dissipation performance of the first cylindrical section 22 and the second cylindrical section 32 while ensuring the acoustic characteristics of the ultrasonic scalpel transducer. This ensures better acoustic characteristics and thermal conductivity of the ultrasonic scalpel transducer and allows for faster dissipation of heat from the ultrasonic scalpel tip.

[0054] In some embodiments, please combine Figures 1-3 As shown, the diameter D2 of the first cylindrical segment 22 and / or the second cylindrical segment 32 also satisfies D2≤1.35·d.

[0055] It should be noted that, in order to ensure better heat conduction of the ultrasonic scalpel transducer and to more quickly disperse the heat at the tip of the ultrasonic scalpel, the diameter D2 of the first cylindrical segment 22 and / or the second cylindrical segment 32 must satisfy D2 > d, where d is the diameter of the piezoelectric crystal stack 10; at the same time, the diameter D2 of the first cylindrical segment 22 and / or the second cylindrical segment 32 must also satisfy D2 ≤ 1.35·d, otherwise it will easily increase the weight of the first cover plate 20 and / or the second cover plate 30 and the entire ultrasonic scalpel transducer, resulting in a large overall weight of the scalpel head, which may easily cause operator fatigue during the operation.

[0056] In this embodiment, the diameter D2 of the first cylindrical segment 22 and / or the second cylindrical segment 32 satisfies d<D2≤1.35·d. On the one hand, this increases the heat conduction area, ensuring better heat conduction of the ultrasonic scalpel transducer and faster dispersal of heat from the ultrasonic scalpel tip. On the other hand, it helps to reduce the overall weight of the scalpel head and avoids hand fatigue for the surgeon during clinical surgery.

[0057] In some embodiments, see Figure 2 As shown, the first cover plate 20 also includes:

[0058] The tabletop section 24 is located at one end of the first cylindrical section 22 that is axially away from the first abutment portion 21;

[0059] A spherical segment 23 is disposed between the tabletop segment 24 and the first cylindrical segment 22, and the spherical segment 23 is adapted to smoothly transition the tabletop segment 24 and the first cylindrical segment 22;

[0060] The third cylindrical section 25 is disposed at one end of the table section 24 away from the spherical section 23 along the axial direction. The third cylindrical section 25 is adapted to form an integral multi-composite structure with the table section 24, the spherical section 23, the first cylindrical section 22 and the first abutment portion 21.

[0061] It should be noted that the first cover plate 20 is constructed by sequentially arranging a first cylindrical section 22, a spherical section 23, a mesa section 24, and a third cylindrical section 25 along the axial direction to form an overall multi-layered composite structure consisting of the first cylindrical section 22, the spherical section 23, the mesa section 24, and the third cylindrical section 25. This structure achieves a balance between the overall length of the structure and the transducer's resonant frequency, ensuring optimal weight while achieving better resonant characteristics and guaranteeing the transducer's resonance effect. Furthermore, it ensures sufficient gain while maintaining the two resonant frequencies F of the ultrasonic transducer. p -F s ≥1000Hz, where F p For the parallel resonant frequency, F s The series resonant frequency makes it easier to adapt the ultrasonic scalpel transducer to the host, greatly reducing the difficulty of the host driving and controlling the transducer under complex working conditions, while improving the working efficiency of the transducer.

[0062] In some embodiments, see Figure 2 As shown, the diameter of the end face of the platform section 24 near the first abutment part 21 along the axial direction is D3, and D3 satisfies 1 / 2·d≤D3≤3 / 4·d;

[0063] The diameter of the end face of the platform section 24 away from the first abutment part 21 along the axial direction and / or the diameter of the third cylindrical section 25 is D4, and D4 satisfies 1 / 3·d≤D4≤1 / 2·d.

[0064] It should be noted that, as Figure 2 As shown, the diameter of the end face of the platform section 24 near the first abutment part 21 along the axial direction is D3. If D3 is too small, it is easy to generate spurious frequencies, resulting in unstable or abnormal vibration modes and insufficient vibration output. Therefore, D3 needs to satisfy D3≥1 / 2·d. If D3 is too large, it is easy to increase the weight of the first cover plate 20 and the entire ultrasonic scalpel transducer, resulting in a large overall weight of the scalpel head. In clinical practice, this can easily lead to operator fatigue. Therefore, D3 also needs to satisfy D3≤3 / 4·d. The diameter of the end face of the platform section 24 away from the first abutment part 21 along the axial direction and / or the diameter of the third cylindrical section 25 is D4. If D4 is too small, it is easy to generate spurious frequencies, resulting in unstable or abnormal vibration modes and insufficient vibration output. Therefore, D4 ​​needs to satisfy D4≥1 / 3·d. If D4 is too large, it will not only easily increase the weight of the first cover plate 20 and the entire ultrasonic scalpel transducer, resulting in a large overall weight of the scalpel head, which can easily cause operator fatigue during surgery, but also affect the overall configuration of the multi-composite structure of the first cylindrical section 22-spherical section 23-platform section 24-third cylindrical section 25, and disrupt the balance between the overall length of the structure and the resonant frequency of the transducer, making it difficult to obtain better resonance characteristics under the condition of optimal weight. Therefore, D4 ​​also needs to satisfy D4≤1 / 2·d.

[0065] In this embodiment, the end face diameter D3 of the platform segment 24 approaching the first abutment portion 21 along the axial direction satisfies 1 / 2·d≤D3≤3 / 4·d. Meanwhile, the end face diameter of the platform segment 24 away from the first abutment portion 21 along the axial direction and / or the diameter D4 of the third cylindrical segment 25 satisfies 1 / 3·d≤D4≤1 / 2·d. This avoids the generation of spurious frequencies, prevents mode instability or abnormal mode, and ensures sufficient vibration output. On the other hand, it reduces the overall weight of the entire ultrasonic scalpel transducer and scalpel head, avoiding operator fatigue during clinical surgery. Furthermore, it maintains the overall configuration of the multi-composite structure of the first cylindrical segment 22-spherical segment 23-platform segment 24-third cylindrical segment 25, ensuring better resonance characteristics while optimizing weight. This greatly reduces the difficulty of driving and controlling the transducer under complex working conditions, while improving the transducer's working efficiency.

[0066] In some embodiments, see Figure 4 As shown, the ultrasonic scalpel transducer also includes a pre-tightening screw 40, which is disposed at one end of the second cover plate 30 away from the piezoelectric crystal stack 10 along the axial direction. The pre-tightening screw 40 is adapted to fix the first cover plate 20, the piezoelectric crystal stack 10 and the second cover plate 30.

[0067] In this embodiment, one end of the pre-tightening screw 40 passes through the second cover plate 30 and the piezoelectric crystal stack 10 in sequence along the axial direction and is threadedly connected to the first cover plate 20, thereby fixing the first cover plate 20, the piezoelectric crystal stack 10 and the second cover plate 30, so that the two axial ends of the piezoelectric crystal stack 10 are completely and tightly fitted with the first abutment portion 21 and the second abutment portion 31 respectively.

[0068] In some embodiments, both the first cover plate 20 and the second cover plate 30 are made of aluminum alloy.

[0069] The preload screw 40 is made of titanium alloy.

[0070] It should be noted that in the relevant technology, the cover plate and pre-tightening screw of the ultrasonic scalpel transducer are made of stainless steel. The ultrasonic scalpel transducer is relatively heavy, resulting in a large overall weight of the scalpel head, which can easily cause operator fatigue during clinical surgery. In addition, the cover plate is made of stainless steel, which has poor thermal conductivity and is not conducive to heat conduction.

[0071] The ultrasonic scalpel transducer provided in this embodiment has an aluminum alloy cover plate 20 and a aluminum alloy cover plate 30, both of which are made of aluminum alloy. Compared with stainless steel cover plates, this not only reduces the overall weight of the ultrasonic scalpel transducer while ensuring its acoustic transmission efficiency, but also enhances the thermal conductivity of the first and second cover plates 20 and 30. Meanwhile, the preload screw 40 is made of titanium alloy. Titanium alloy has high modulus, low density, and high strength, ensuring excellent acoustic properties while also possessing the mechanical properties of stainless steel, and is lighter than stainless steel.

[0072] In some embodiments, see Figure 5 As shown, the first cover plate 20 has a threaded hole 201 at one end of the piezoelectric crystal stack 10 along the axial direction, the second cover plate 30 has a first through hole 301 along the axial direction, and the piezoelectric crystal stack 10 has a second through hole 101 along the axial direction. The threaded hole 201 is coaxially arranged with the first through hole 301 and the second through hole 101.

[0073] The axial end of the preload screw 40 is provided with a threaded portion 41. The axial end of the preload screw 40 is adapted to pass through the first through hole 301 and the second through hole 101 so that the threaded portion 41 is threadedly connected to the threaded hole 201.

[0074] In this embodiment, by opening a threaded hole 201 at one end of the first cover plate 20 close to the piezoelectric crystal stack 10 along the axial direction, and providing a threaded part 41 at one end of the pre-tightening screw 40 along the axial direction, the threaded part 41 is threadedly connected to the threaded hole 201, thereby making the two ends of the piezoelectric crystal stack 10 along the axial direction completely and tightly fitted with the first abutment part 21 and the second abutment part 31 respectively.

[0075] In some embodiments, see Figure 6 As shown, a first clamping part 33 is provided on the outer peripheral wall of the first cylindrical section 22 and the second cylindrical section 32; a second clamping part 42 is provided on the screw head of the pre-tightening screw 40, and the first clamping part 33 and the second clamping part 42 are suitable for clamping by tooling.

[0076] In this embodiment, by providing a first clamping part 33 and a second clamping part 42, the tooling is used to stably clamp the first clamping part 33 and the second clamping part 42 during the assembly process, thereby facilitating the threaded part 41 to be threadedly connected to the threaded hole 201 and avoiding damage to the surfaces of the first cover plate 20 and the second cover plate 30.

[0077] In some embodiments, see Figure 5 As shown, the piezoelectric crystal stack 10 includes four piezoelectric ceramic sheets 11 and several electrode sheets 12. The electrode sheets 12 are disposed on at least one side of each piezoelectric ceramic sheet 11 along the axial direction, and the electrode sheets 12 are attached to the piezoelectric ceramic sheets 11.

[0078] It should be noted that the ultrasonic scalpel transducer provided by the present invention has a half-wavelength structure of four piezoelectric ceramic plates 11 to ensure that the capacitance of the ultrasonic scalpel transducer is consistent with that of the gun transducer, so that the host can be adapted to the ultrasonic scalpel transducer without difference, which helps to reduce the difficulty of host upgrade and development.

[0079] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and all such modifications and variations fall within the scope defined by the appended claims.

Claims

1. An ultrasonic scalpel transducer, characterized in that, include: piezoelectric crystal stack (10); A first cover plate (20) is disposed at one axial end of the piezoelectric crystal stack (10); the first cover plate (20) includes a first abutting part (21) and a first cylindrical section (22), the first cylindrical section (22) is connected to the first abutting part (21), and the first abutting part (21) is adapted to abut against one axial end of the piezoelectric crystal stack (10); A second cover plate (30) is disposed at one end of the piezoelectric crystal stack (10) away from the first cover plate (20) along the axial direction; the second cover plate (30) includes a second abutment portion (31) and a second cylindrical section (32), the second cylindrical section (32) is connected to the second abutment portion (31), and the second abutment portion (31) is adapted to abut against the other end of the piezoelectric crystal stack (10) along the axial direction; The diameters of the first abutting part (21) and the second abutting part (31) are D1, D1 satisfies D1=d, and the diameters of the first cylindrical segment (22) and / or the second cylindrical segment (32) are D2, D2 satisfies D2>d, where d is the diameter of the piezoelectric crystal stack (10); The first cover plate (20) also includes: The tabletop section (24) is located at one end of the first cylindrical section (22) away from the first abutment (21) along the axial direction; A spherical segment (23) is disposed between the tabletop segment (24) and the first cylindrical segment (22), and the spherical segment (23) is adapted to smoothly transition the tabletop segment (24) and the first cylindrical segment (22); The third cylindrical section (25) is disposed at one end of the table section (24) away from the spherical section (23) along the axial direction. The third cylindrical section (25) is adapted to form an integral multi-composite structure with the table section (24), the spherical section (23), the first cylindrical section (22) and the first abutment (21).

2. The ultrasonic scalpel transducer according to claim 1, characterized in that, The diameter D2 of the first cylindrical segment (22) and / or the second cylindrical segment (32) also satisfies D2≤1.35·d.

3. The ultrasonic scalpel transducer according to claim 1, characterized in that, The diameter of the end face of the platform section (24) near the first abutment part (21) along the axial direction is D3, and D3 satisfies 1 / 2·d≤D3≤3 / 4·d; The diameter of the end face of the platform segment (24) away from the first abutment portion (21) along the axial direction and / or the diameter of the third cylindrical segment (25) is D4, where D4 satisfies 1 / 3·d≤D4≤1 / 2·d.

4. The ultrasonic scalpel transducer according to any one of claims 1-3, characterized in that, The ultrasonic scalpel transducer also includes a pre-tightening screw (40), which is disposed at one end of the second cover plate (30) axially away from the piezoelectric crystal stack (10). The pre-tightening screw (40) is adapted to fix the first cover plate (20), the piezoelectric crystal stack (10) and the second cover plate (30).

5. The ultrasonic scalpel transducer according to claim 4, characterized in that, Both the first cover plate (20) and the second cover plate (30) are made of aluminum alloy. The preload screw (40) is made of titanium alloy.

6. The ultrasonic scalpel transducer according to claim 4, characterized in that, The first cover plate (20) has a threaded hole (201) at one end close to the piezoelectric crystal stack (10) along the axial direction, the second cover plate (30) has a first through hole (301) along the axial direction, and the piezoelectric crystal stack (10) has a second through hole (101) along the axial direction. The threaded hole (201) is coaxially arranged with the first through hole (301) and the second through hole (101). The pre-tightening screw (40) has a threaded portion (41) at one axial end. The axial end of the pre-tightening screw (40) is adapted to pass through the first through hole (301) and the second through hole (101) so that the threaded portion (41) is threadedly connected to the threaded hole (201).

7. The ultrasonic scalpel transducer according to claim 4, characterized in that, A first clamping part (33) is provided on the outer peripheral wall of the first cylindrical section (22) and the second cylindrical section (32); a second clamping part (42) is provided on the screw head of the pre-tightening screw (40), and the first clamping part (33) and the second clamping part (42) are suitable for clamping by tooling.

8. The ultrasonic scalpel transducer according to any one of claims 1-3, characterized in that, The piezoelectric crystal stack (10) includes a plurality of piezoelectric ceramic sheets (11) and a plurality of electrode sheets (12). The electrode sheets (12) are disposed on at least one side of the piezoelectric ceramic sheets (11) along the axial direction, and the electrode sheets (12) are attached to the piezoelectric ceramic sheets (11).

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