Path and focal nucleus variable high intensity self-focusing ultrasonic transducer

Abstract

The application discloses a path and focal nucleus variable high-strength self-focusing ultrasonic transducer, relates to the technical field of ultrasonic treatment, and comprises a seat device and a sliding device. The seat device comprises multiple groups of focusing units. The multiple groups of focusing units are enclosed along the same axis to form a parabolic structure. The sliding device is arranged along the central axis of the parabolic structure and can reciprocatingly move along the central axis. When the sliding device moves towards the parabolic structure, the focusing units slide and expand outwards along the parabolic surface. When the sliding device moves away from the parabolic structure, the focusing units slide and fold inwards along the parabolic surface. The application adjusts the expansion or folding of the focusing units, realizes dynamic adjustment of the size and shape of the focal nucleus, and adapts to tumors of different sizes and shapes, thereby solving the problems of the poor treatment adaptability and the non-adjustable focal nucleus of the traditional ultrasonic transducer.

Description

Technical Field

[0001] This invention relates to the field of ultrasound therapy technology, specifically to a high-intensity self-focusing ultrasound transducer with variable path and focal core. Background Technology

[0002] Ultrasound is increasingly used in treatment and diagnosis due to its strong tissue penetration and lack of ionizing radiation. In ultrasound therapy and diagnosis, the most commonly used ultrasound transducers are planar ultrasound transducers and focused ultrasound transducers.

[0003] Existing focused ultrasound transducers have a fixed focal core size and shape after assembly, lacking the ability to dynamically adjust. This characteristic makes it difficult to achieve precise treatment when faced with complex and diverse tumor conditions. For example, tumors vary in size, shape, and positional relationship with surrounding tissues, and the fixed focal core cannot be adapted to the specific characteristics of the tumor, significantly reducing treatment effectiveness.

[0004] Meanwhile, existing transducers exhibit a large area of ​​high-energy distribution within the ultrasonic acoustic field channel sector. When treating superficial lesions under the ribs, this high-energy area inevitably covers normal tissue in the acoustic channel region, leading to thermal damage. This thermal damage not only causes additional pain for patients but may also cause irreversible damage to bodily functions, severely impacting their recovery and quality of life.

[0005] Furthermore, existing focused ultrasound transducers are extremely demanding in their requirements regarding tumor location. In some superficial subcostal areas, lesions are often obstructed by ribs and other tissues, making it difficult to accurately focus ultrasound waves onto the lesion. During attempts to treat these obstructed lesions, the ultrasound energy can be abnormally distributed within the acoustic channel, leading to thermal damage and severe postoperative complications. This limitation significantly restricts the application of focused ultrasound transducers in tumor treatment, preventing some patients from benefiting from this advanced treatment technology.

[0006] In summary, existing focused ultrasound transducers have many problems that urgently need to be solved in tumor treatment. There is an urgent need for a self-focusing transducer to allow for flexible adjustment of the size, shape, and position of the transducer focal nucleus, thereby improving the accuracy and safety of treatment, avoiding unnecessary harm to patients, and meeting the actual needs of clinical tumor treatment. Summary of the Invention

[0007] The purpose of this invention is to provide a high-intensity self-focusing ultrasound transducer with variable path and focal core. By adjusting the expansion or closure of the focusing unit, the size and shape of the focal core can be dynamically adjusted to adapt to tumors of different sizes and shapes, thus solving the problems of non-adjustable focal core and poor treatment adaptability of traditional ultrasound transducers.

[0008] This invention is achieved through the following technical solution:

[0009] A high-intensity self-focusing ultrasonic transducer with variable path and focal core includes:

[0010] The upper seat device includes multiple sets of focusing units, which are arranged along the same axis to form a parabolic structure.

[0011] A sliding device is provided, which is arranged along the central axis of the parabolic structure and can reciprocate along the central axis. When the sliding device moves into the parabolic structure, the focusing unit slides outward along the parabolic surface. When the sliding device moves away from the parabolic structure, the focusing unit slides inward along the parabolic surface.

[0012] In this design, the upper device employs a parabolic structure formed by multiple focusing units, providing a geometric basis for the directional focusing of ultrasonic energy. The sliding device reciprocates along the central axis of the parabola, thereby controlling the focusing units to expand or close along the parabola via mechanical transmission, thus altering the convergence path and focal core shape of the ultrasonic energy. When the sliding device moves inward toward the parabola, the focusing units expand outward to form a larger energy coverage area, suitable for superficial treatment scenarios requiring energy dispersion to reduce thermal damage. When the sliding device moves away from the parabola, the focusing units close inward to form a more concentrated high-energy sound field, meeting the needs of deep tumor treatment. Therefore, this invention overcomes the limitations of traditional fixed focal core transducers, adjusting the ultrasonic energy distribution in real time through mechanical movement, and solving the core problems of existing technologies such as inability to adapt to complex lesion morphologies, easy thermal damage to normal tissues, and low treatment efficiency.

[0013] As a further embodiment of the self-focusing ultrasonic transducer, each focusing unit is provided with a sliding device at its end. The head of the sliding device that is close to the parabolic structure is a curved structure, and the sliding device slides in contact with the curved head.

[0014] In this design, the sliding device at the end of each focusing unit forms a curved surface contact with the curved head of the sliding device. The linear motion of the main sliding device is converted into the radial unfolding / closing motion of the focusing unit along the parabolic surface through curved surface geometric constraints. When the main sliding device moves along the central axis, the curved head drives the sliding device through the curved surface contact, thereby causing the focusing unit to slide on the parabolic surface. This alters the convergence path and focal core shape of the ultrasound energy, while simultaneously allowing the focusing unit to maintain dynamic angular adjustment relative to the normal direction of the parabolic surface during movement, ensuring that the ultrasound energy can be precisely focused onto the target area according to clinical needs.

[0015] As a further embodiment of the self-focusing ultrasonic transducer, a main sliding device is connected to the head of the sliding device, which is close to the parabolic structure. The main sliding device reciprocates along the central axis, causing the focusing unit to expand or close.

[0016] In this scheme, the main sliding device serves as the power input end, and through linear reciprocating motion along the central axis of the parabolic surface, it converts external mechanical power into the radial unfolding / closing motion of the focusing unit.

[0017] As a further embodiment of the self-focusing ultrasonic transducer, the main sliding device has a spherical structure, and the secondary sliding device slides in point contact with the spherical surface of the main sliding device.

[0018] In this design, the spherical main sliding device and the secondary sliding device form a single-point contact. This geometric constraint ensures the accuracy of motion transmission and reduces mechanical loss through the low-friction characteristics of the spherical pair. When the main sliding device moves along the central axis, the spherical head drives the secondary sliding device through point contact, converting linear motion into radial expansion / contraction of the focusing unit along the parabolic surface. Simultaneously, this spherical point contact structure enables the secondary sliding device to adapt to the angle changes of the focusing unit during movement, ensuring that all focusing units expand synchronously and uniformly to the target position (e.g., 15-40° opening angle). This achieves continuous adjustment of the focal core size, allowing the transducer to quickly respond to clinical needs during treatment and adjust the sound field distribution in real time. While ensuring the treatment energy density, it effectively reduces thermal damage to normal tissues caused by sidelobe energy.

[0019] As a further embodiment of the self-focusing ultrasonic transducer, the upper device also includes a slide rail base, which is connected to the outer wall of the sliding device and the inner wall of the slide rail base is a parabolic surface. The focusing unit rolls along the inner wall of the slide rail base via a rolling assembly.

[0020] In this design, the parabolic inner wall of the slide rail base and the parabolic structure of the focusing unit form a geometric conjugate. When the sliding device moves along the central axis, the focusing unit achieves low-friction and high-precision radial sliding on the parabolic slide rail through the rolling assembly. The parabolic constraint ensures that the convergence path of the ultrasonic energy always matches the clinical treatment needs.

[0021] As a further embodiment of the self-focusing ultrasonic transducer, a return fixing seat is also connected to the outer wall of the sliding device, and a return device is connected between the return fixing seat and the rolling assembly, the return device providing a reset force for the focusing unit.

[0022] In this design, one end of the return device is fixed to the return mounting base, and the other end is connected to the rolling assembly of the focusing unit. During the unfolding process of the focusing unit, it generates elastic deformation and stores potential energy. When the main sliding device retracts, the return device releases the stored elastic force and drives the focusing unit to quickly return to the closed state along the parabolic slide rail through the rolling assembly. This ensures that the focusing units fit tightly together to form a concentrated sound field. In this way, not only is the active reset of the focusing unit achieved, but the driving force requirement of the main sliding device is also reduced through elastic force compensation. At the same time, it ensures that all focusing units retract synchronously and evenly. The reset force of the return device and the driving force of the main sliding device form a two-way synergy, enabling the transducer to quickly switch between the unfolding treatment and the closing treatment modes.

[0023] As a further embodiment of the self-focusing ultrasonic transducer, the rolling components on each focusing unit are arranged in a plurality of arrays at intervals along the sliding direction, and the return device is connected to one of the rolling components.

[0024] In this design, multiple rolling components are spaced apart along the sliding direction of the parabolic slide rail. This not only disperses the load during the movement of the focusing unit and reduces single-point contact stress, but also ensures that the focusing unit maintains a stable parabolic shape during unfolding / closing through multi-point support. The return device is connected to only one of the rolling components, using the lever principle to convert the elastic restoring force into the overall closing motion of the focusing unit. When the main sliding device retracts, the return device applies tension through the connection point, driving the rolling component to move along the slide rail base towards the center of the parabola. Simultaneously, the rigid structure of the focusing unit transmits the restoring force to the other rolling components, ensuring that all focusing units close synchronously and uniformly into a closed state, achieving precise control of the focal core shape. Furthermore, the spaced array of rolling components allows the return device to adjust its connection position according to treatment needs, flexibly changing the point of application of the restoring force and further optimizing the sound field distribution.

[0025] As a further embodiment of the self-focusing ultrasonic transducer, a through sliding groove matching the rolling assembly is provided on the side wall of the slide rail base;

[0026] The rolling assembly includes a piezoelectric moving shaft and a roller. One end of the piezoelectric moving shaft is connected to the focusing unit, and the other end of the piezoelectric moving shaft passes through the sliding groove and is connected to the roller. The roller drives the focusing unit to roll along the outer wall of the slide rail base.

[0027] In this scheme, the sliding groove provides motion trajectory constraints for the piezoelectric moving shaft, ensuring that it maintains a precise angle with the normal direction of the parabolic surface of the slide rail base when driving the focusing unit to unfold / close along the parabolic surface. The roller converts sliding friction into rolling friction through rolling contact with the outer wall of the slide rail base, significantly reducing motion resistance and improving mechanical efficiency.

[0028] As a further embodiment of the self-focusing ultrasonic transducer, the focusing unit includes a piezoelectric device and an energy harvesting and reflecting device. The inner wall of the energy harvesting and reflecting device is connected to the piezoelectric device and drives the piezoelectric device to expand or retract.

[0029] In this scheme, the inner wall of the energy harvesting and reflecting device is rigidly connected to the piezoelectric device. When the sliding device drives the energy harvesting and reflecting device to unfold or close along the parabolic slide rail, its inner wall synchronously drives the piezoelectric device to adjust its angle through mechanical linkage. By changing the geometry of the ultrasonic transmitting array, the dynamic control of the main lobe width and side lobe energy distribution of the sound field can be achieved.

[0030] As a further embodiment of the self-focusing ultrasonic transducer, when the piezoelectric device is in the deployed state, adjacent piezoelectric devices are not closed, forming a gap.

[0031] In this scheme, when the main sliding device drives the focusing unit to unfold along the parabolic surface, the gap formed between adjacent piezoelectric devices breaks the structure of the traditional transducer's continuous fan-shaped high-energy sound field. By changing the geometry of the ultrasonic wave transmitting array, the width of the main lobe of the sound beam is gradually shortened, and the energy ratio of the side lobes is gradually increased. In this way, the gap forms a low-energy protection area directly below the focal nucleus, effectively reducing thermal damage to superficial normal tissues during treatment.

[0032] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0033] 1. This invention drives the focusing unit to expand / close along a parabolic surface through a main sliding device, thereby achieving continuous adjustment of the size and shape of the focal nucleus. This overcomes the limitation of traditional fixed focal nucleus transducers that cannot adapt to complex tumor morphologies, and will greatly shorten the treatment time in clinical treatment.

[0034] 2. In the unfolded state, the present invention forms a gap between adjacent piezoelectric devices, which gradually shortens the width of the main lobe of the sound beam and gradually increases the energy ratio of the side lobes, and forms an energy attenuation zone directly below the focal nucleus, effectively reducing thermal damage to superficial normal tissues. At the same time, since the reduction in the size of the focal nucleus is essentially the energy being dispersed to the side lobes, and when the difference between the side lobes and the main lobe is not significant, the side lobes also have a significant effect on the treatment of tumors.

[0035] 3. This invention can also change the sound path by adjusting the angle of the focusing unit, successfully avoiding rib obstruction to achieve treatment of superficial lesions under the ribs, breaking through the strict requirements of traditional transducers on the location of lesions. Attached Figure Description

[0036] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0037] Figure 1 This is a schematic diagram of the structure of the present invention;

[0038] Figure 2 This is a top view of the structure of the present invention in the closed state;

[0039] Figure 3 This is a front view of the structure of the present invention in the closed state;

[0040] Figure 4 This is a top view of the structure of the present invention in the open state;

[0041] Figure 5 This is a front view of the structure of the present invention in the open state;

[0042] Figure 6 This refers to the projected area of ​​the invention at the same depth when it is in the closed state.

[0043] Figure 7 This is a simulation diagram of the linear sound field of the present invention in the closed state;

[0044] Figure 8 This is a diagram showing the acoustic path simulation calculation of the present invention in the closed state;

[0045] Figure 9 This refers to the projected area of ​​the invention at the same depth when it is in the open state.

[0046] Figure 10 This is a simulation diagram of the linear sound field of the present invention in the open state;

[0047] Figure 11 This is a simulation diagram of the acoustic path in the open state of the present invention.

[0048] Figure 12This is the focal core variation curve along the center direction of the wafer in this invention;

[0049] Figure 13 This is the focal core variation curve along the center direction of the wafer gap in this invention;

[0050] Figures 14-17 The graph shows the energy changes of the main lobe and side lobes as the opening angle of the piezoelectric device increases.

[0051] The attached diagram shows the markings and corresponding component names:

[0052] 1-Piezoelectric device, 2-Energy harvesting and reflecting device, 3-Slide rail base, 4-Piezoelectric moving shaft, 5-Roller seat, 6-Roller, 7-Fixing device, 8-Sliding device, 9-Returning device, 10-Returning fixed seat, 11-Main sliding device. Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0054] Example 1

[0055] This embodiment 1 provides a high-intensity self-focusing ultrasonic transducer with variable path and focal core, such as Figure 1 As shown, it includes an upper seat device and a sliding device;

[0056] Among them, such as Figure 1 As shown, the upper device includes multiple focusing units and a slide rail base 3. The number of focusing units can be selected according to actual needs. In this embodiment, the upper device includes 6 focusing units. These 6 focusing units are arranged along the same axis to form a parabolic structure. This parabolic design helps to more effectively concentrate ultrasonic energy and improve the focusing effect. The slide rail base 3 is connected to the outer wall of the sliding device, and the inner wall of the slide rail base 3 is a parabolic surface that matches the parabolic structure.

[0057] Among them, such as Figure 1As shown, each focusing unit comprises a piezoelectric device 1 and an energy harvesting and reflecting device 2. The piezoelectric device 1 is the core component for generating ultrasound waves. When an alternating voltage is applied, the piezoelectric device 1 generates mechanical vibration, thereby radiating ultrasound waves outward. During operation, it can convert electrical energy into ultrasonic energy, providing the energy required for ultrasound therapy. The inner wall of the energy harvesting and reflecting device 2 is tightly connected to the piezoelectric device 1. Its main function is to collect the ultrasonic energy generated by the piezoelectric device 1 and further converge and guide the energy through reflection, enhancing the focusing effect of the ultrasonic energy in the target area. Therefore, to achieve the purpose of adjusting the size and shape of the focal core, the outer wall of the energy harvesting and reflecting device 2 is connected to the rolling assembly through the piezoelectric moving shaft 4. Each focusing unit rolls along the side wall of the slide rail base 3 through the rolling assembly.

[0058] Meanwhile, a through hole is formed in the middle of the parabolic structure surrounded by the six focusing units. A sliding device is installed in the through hole. The sliding device is set along the central axis of the through hole and can move back and forth along the axis of the through hole under the drive of the driving mechanism.

[0059] like Figure 2 and Figure 3 As shown, when the sliding device moves away from the parabolic structure to its lower limit, the energy harvesting and reflecting device 2 and the piezoelectric device 1 move along the slide rail base 3 to a closed state, with no gaps between the six piezoelectric devices 1. At this time, the projected area of ​​the transducer at the same depth is shown in the attached figure. Figure 6 The linear sound field simulation calculation is attached. Figure 7 The simulation calculation expansion diagram of the sound path is attached. Figure 8 At this point, the acoustic field channel between piezoelectric device 1 and the focal region presents a fan-shaped structure, entirely within a high-energy region, making it more suitable for treating unobstructed lesions such as uterine fibroids.

[0060] like Figure 4 and Figure 5 As shown, when the sliding device moves into the parabolic structure, it drives the energy harvesting and reflecting device 2 and the piezoelectric device 1 to move upward along the slide rail base 3, causing the piezoelectric device 1 to open like petals, without closing between them, forming a gap; see attached diagram. Figure 9 The projected area of ​​the transducer at the same depth is increased; see the appendix for linear sound field simulation calculations. Figure 10 The simulation calculation expansion diagram of the sound path is attached. Figure 11 At this time, the piezoelectric device 1 forms a large low-energy region in the fan-shaped area directly below the foci. By adjusting the moving angle of the piezoelectric device 1, the temperature rise during treatment can be reduced, and thermal damage can be avoided.

[0061] In this embodiment, it should also be noted that, as the sliding device moves upward according to the treatment needs, the energy harvesting and reflecting device 2 and the piezoelectric device 1 move upward along the guide rail base 3, changing the angle of the piezoelectric device 1 in the guide rail base 3. This change in angle can cause a change in the focal nucleus, as shown in the focal nucleus change curve. Figure 12 and Figure 13 As the opening angle of piezoelectric device 1 increases, the size of the focal nucleus decreases significantly. Furthermore, as the opening angle of piezoelectric device 1 increases, the main lobe (the region with the highest ultrasonic energy density, corresponding to the focal nucleus) gradually narrows, while the side lobes (secondary energy beams formed on either side of the main lobe due to interference effects when the ultrasonic transducer array emits sound waves) gradually widen. (See...) Figures 14-17 The energy of the main lobe decreased significantly, while the energy of the side lobes increased significantly. This indicates that the reduction in the size of the focal nucleus essentially means that energy is distributed to the side lobes. When the difference between the side lobes and the main lobe is not significant, the side lobes also have a significant therapeutic effect on tumors. Therefore, the gap formed between adjacent piezoelectric devices 1 can transform the side lobes, which are traditionally considered interference, into a therapeutic advantage. This dynamic side lobe regulation process breaks through the traditional cognitive limitation of "the stronger the main lobe, the better" in ultrasound therapy, and realizes the dynamic distribution of sound field energy, significantly improving safety while ensuring therapeutic efficacy.

[0062] Example 2

[0063] This embodiment 2 further provides a high-intensity self-focusing ultrasonic transducer with variable path and focal core based on embodiment 1, such as... Figures 1-5 As shown, each energy harvesting and reflecting device 2 is connected to a sliding device 8 at its end, and the head of the sliding device that is close to the sliding device 8 is a curved structure, and the sliding device 8 slides in contact with the curved head.

[0064] Specifically, please refer to Figure 1 , Figure 2 and Figure 4 As shown, the head of the sliding device close to the sliding device 8 is connected to the main sliding device 11. The main sliding device 11 serves as the power input end. Through linear reciprocating motion along the central axis of the through hole, it converts external mechanical power into the radial unfolding / closing motion of the focusing unit. The main sliding device 11 has a spherical structure, and the head of the sliding device 8 also has a spherical structure. The head of the sliding device 8 and the spherical surface of the main sliding device 11 form a point contact sliding mechanism, which enables the sliding device 8 to adapt to the angle change of the focusing unit during the movement, ensuring that all focusing units unfold synchronously and uniformly to the target position, thereby realizing the continuous adjustment of the focal core size.

[0065] Meanwhile, a return fixing seat 10 is also connected to the outer wall of the sliding device. The return fixing seat 10 is located below the main sliding device 11. A return device 9 is connected between the return fixing seat 10 and the rolling assembly. The return device 9 is usually an elastic element, such as a spring. It is connected between the return fixing seat 10 and the piezoelectric moving shaft 4 of the rolling assembly. It stores elastic potential energy when the focusing unit is unfolded, providing power for the repositioning of the focusing unit. In order to adjust the connection position according to the treatment needs and further optimize the sound field distribution, multiple rolling assemblies on each focusing unit are arrayed at intervals along the sliding direction. The return device 9 can be connected to one of the rolling assemblies as needed, thereby flexibly changing the point of application of the repositioning force.

[0066] In this embodiment, in order to ensure that the focusing unit maintains a precise angle with the normal direction of the parabolic surface of the slide rail base 3 when it unfolds / closes along the parabolic surface, a through sliding groove matching the rolling assembly is provided on the side wall of the slide rail base 3. The sliding groove provides motion trajectory constraints for the piezoelectric moving shaft 4. Specifically, the rolling assembly includes a roller seat 5 and a roller 6. One end of the piezoelectric moving shaft 4 is connected to the energy harvesting and reflecting device 2, and the other end of the piezoelectric moving shaft 4 passes through the sliding groove and is connected to the roller 6 through the roller seat 5. The roller 6 drives the energy harvesting and reflecting device 2 to roll along the outer side wall of the slide rail base 3.

[0067] The working principle of this embodiment is as follows: When the main sliding device 11 moves forward along the central axis of the through hole, it drives the secondary sliding device 8 to move through spherical point contact. The secondary sliding device 8 further drives the energy harvesting and reflecting device 2 in the focusing unit. The energy harvesting and reflecting device 2, through its connection with the piezoelectric device 1, drives the piezoelectric device 1 to unfold along the parabolic trajectory of the slide rail base 3. During the unfolding process, the rolling assembly rolls along the outer wall of the slide rail base 3 to ensure smooth movement. Gaps will gradually form between adjacent piezoelectric devices 1. By adjusting the size of the gaps and the unfolding angle of the focusing unit, the propagation path and focusing effect of the ultrasonic waves can be changed, thereby achieving adjustment of the focal core size and position.

[0068] When the main sliding device 11 moves in the opposite direction, the return device 9 begins to function. The elastic potential energy stored in the return device 9 is gradually released, pulling the rolling assembly, which in turn drives the piezoelectric device 1 and the energy harvesting and reflecting device 2 in the focusing unit to retract, so that the adjacent piezoelectric devices 1 re-fit and return to the initial focusing state.

[0069] In this way, the high-intensity self-focusing ultrasound transducer can flexibly adjust the path of ultrasound energy and the size and position of the focal core according to different treatment needs, thereby improving the effectiveness and adaptability of ultrasound therapy.

[0070] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A path and focal nucleus variable high intensity self-focusing ultrasonic transducer, characterized by, The application relates to a focusing device, which comprises: a seat device, which comprises a plurality of focusing units, the focusing units are enclosed along the same axis to form a parabolic structure, and a through hole is formed in the middle of the parabolic structure; a sliding device, which is arranged along the central axis of the through hole and can move back and forth along the axis of the through hole under the drive of a driving mechanism; when the sliding device moves along the axis of the through hole towards the concave side of the parabolic structure, the focusing units slide and expand outwards along the parabolic structure; when the sliding device moves along the axis of the through hole away from the concave side of the parabolic structure, the focusing units slide and contract inwards along the parabolic structure.

2. The path and focal nucleus variable high intensity self-focusing ultrasonic transducer according to claim 1, characterized in that, The end of each focusing unit is provided with a slave sliding device (8), the head of the slave sliding device (8) close to the parabolic structure is in a curved surface structure, and the slave sliding device (8) is in sliding contact with the curved head.

3. The path and focal nucleus variable high intensity self-focusing ultrasonic transducer according to claim 2, characterized in that, The head of the slave sliding device (8) close to the parabolic structure is connected with a master sliding device (11), the master sliding device (11) moves back and forth along the central axis to expand or contract the focusing units.

4. The path and focal nucleus variable high intensity self-focusing ultrasonic transducer according to claim 3, characterized in that, The master sliding device (11) is in a spherical surface structure, and the slave sliding device (8) is in point contact sliding with the spherical surface of the master sliding device (11).

5. The path and focal nucleus variable high intensity self-focusing ultrasonic transducer according to any one of claims 1-4, characterized in that, The seat device further comprises a sliding rail base (3), which is connected to the outer side wall of the sliding device and the inner side wall of the sliding rail base (3) is in a parabolic surface structure, and the focusing units roll along the inner side wall of the sliding rail base (3) through rolling assemblies.

6. The path and focal nucleus variable high intensity self-focusing ultrasonic transducer according to claim 5, characterized in that, The outer side wall of the sliding device is further connected with a reset fixing base (10), a reset device (9) is connected between the reset fixing base (10) and the rolling assembly, and the reset device (9) provides a reset force for the focusing units.

7. The path and focal nucleus variable high intensity self-focusing ultrasonic transducer according to claim 6, characterized in that, The rolling assemblies on each focusing unit are arranged in an array along the sliding direction, and the reset device (9) is connected with one of the rolling assemblies.

8. The path and focal nucleus variable high intensity self-focusing ultrasonic transducer according to claim 6, characterized in that, The side wall of the sliding rail base (3) is provided with through sliding grooves matched with the rolling assemblies. The rolling assembly comprises a piezoelectric moving shaft (4) and a rolling wheel (6), one end of the piezoelectric moving shaft (4) is connected with the focusing unit, the other end of the piezoelectric moving shaft (4) passes through the sliding groove and is connected with the rolling wheel (6), and the rolling wheel (6) drives the focusing unit to roll along the outer side wall of the sliding rail base (3).

9. The path and focal nucleus variable high intensity self-focusing ultrasonic transducer according to claim 5, characterized in that, The focusing unit comprises a piezoelectric device (1) and an energy collecting and reflecting device (2), the inner side wall of the energy collecting and reflecting device (2) is connected with the piezoelectric device (1) and drives the piezoelectric device (1) to expand or contract.

10. The path and focal nucleus variable high intensity self-focusing ultrasonic transducer according to claim 9, characterized in that, When the piezoelectric device (1) is in an expanded state, the adjacent piezoelectric devices (1) are not closed, and a gap is formed.

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