High-frequency ultrasonic transducer probe for ultrasonic tumor therapeutic instrument and assembling method thereof

Abstract

The application discloses an ultrasonic tumor therapeutic instrument high-frequency ultrasonic transducer probe, which comprises a curved disc type composite vibrator, a threaded ring cover, a metal shell and a plug; the threaded ring cover is threadedly connected with the bottom end of the metal shell, the curved disc type composite vibrator is clamped at the connecting position of the threaded ring cover and the metal shell, and the bottom end of the curved disc type composite vibrator is flush with the bottom end of the threaded ring cover; the curved disc type composite vibrator is sequentially bonded by a piezoelectric ceramic disc and a metal disc; the plug is threadedly connected with the top end of the metal shell, the plug and the metal shell are both hollow structures, a BNC cable passes through the hollow structures of the plug and the metal shell and enters the metal shell, a positive wire of the BNC cable is welded on the piezoelectric ceramic disc of the curved disc type composite vibrator, and a negative wire of the BNC cable is connected with the inner wall of the metal shell; the ultrasonic tumor therapeutic instrument high-frequency ultrasonic transducer probe has simple structure, is easy to assemble, has good consistency, high product yield and is beneficial to large-scale automatic mass production.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a high-frequency ultrasonic transducer probe for an ultrasonic tumor therapeutic instrument. BACKGROUND

[0002] Current malignant tumor treatment methods have certain limitations.

[0003] Studies have shown that ultrasound, as a non-invasive and non-invasive means, can produce thermal and non-thermal effects in the body, can significantly reduce patient inflammatory pain symptoms, and can effectively ablate solid tumor tissue. For example, the patent with application number 2022113537052, the intelligent ultrasonic tumor temperature control hyperthermia instrument and the use method, introduces the design and operation method of the packaged whole machine, and the patent with application number 2021208272090, the multi-frequency ultrasonic transducer probe for the ultrasonic tumor therapeutic instrument, discloses the structure of the low-frequency and high-frequency ultrasonic transducer.

[0004] But in the actual assembly and inspection process, the high-frequency ultrasonic transducer probe has the following two problems: first, the assembly process is complex, and the yield and efficiency are low. The high-frequency ultrasonic transducer probe is to clamp the piezoelectric element into the polytetrafluoroethylene sleeve, and then invert the glue after the whole is assembled into the metal shell. After the glue is completely cured, each high-frequency ultrasonic transducer is placed on the lathe with a special fixture to grind the glue along the front radiation surface of the metal shell. In this way, the thickness of the glue layer is controlled to ensure water tightness and sound transmission. It is time-consuming and laborious. The sound transmission glue inevitably causes more or less transmission loss. At the same time, the piezoelectric element requires a return electrode, which further affects the output power capacity of the transducer after glue filling, and the cost of the piezoelectric element is also higher. If unqualified is found during inspection, the entire transducer is directly scrapped and cannot be repaired; second, it is not conducive to passing the biological compatibility test and the electromagnetic compatibility EMC test of medical electrical equipment. The front radiation surface of the high-frequency ultrasonic transducer is an epoxy resin glue layer, which directly contacts the patient's skin in actual use, which is not conducive to passing the biological compatibility test. The positive and negative poles of the cable are directly welded on the return electrode surface of the piezoelectric element, which is not connected with the metal shell, and is easy to radiate noise and leakage magnetic field, which is not conducive to passing the electromagnetic compatibility EMC test of medical electrical equipment. Therefore, it is urgent to design a new high-frequency ultrasonic transducer probe to simplify the assembly process, improve the yield and assembly efficiency, select more friendly materials, and successfully pass the biological compatibility test and electromagnetic compatibility EMC test of medical equipment. SUMMARY

[0005] The purpose of the present application is to provide a high-frequency ultrasonic transducer probe for an ultrasonic tumor therapeutic instrument and an assembly method thereof to solve the problems raised in the background.

[0006] In order to achieve the above object, the application provides the following technical scheme: an ultrasonic tumor therapeutic instrument high-frequency ultrasonic transducer probe, comprising a curved disc type composite vibrator, a threaded ring cover, a metal shell and a plug; the threaded ring cover is threadedly connected with the bottom end of the metal shell, the curved disc type composite vibrator is clamped at the connecting position of the two, and the bottom end of the curved disc type composite vibrator is flush with the bottom end of the threaded ring cover; the curved disc type composite vibrator is sequentially bonded by a piezoelectric ceramic disc and a metal disc; the plug is threadedly connected with the top end of the metal shell, and the plug and the metal shell are both hollow structures; a BNC cable passes through the hollow structures of the plug and the metal shell and enters the inside of the metal shell; the positive lead wire of the BNC cable is welded on the piezoelectric ceramic disc of the curved disc type composite vibrator; and the negative lead wire of the BNC cable is connected with the inner wall of the metal shell.

[0007] When assembling the ultrasonic tumor therapeutic instrument high-frequency ultrasonic transducer probe, only the curved disc type composite vibrator needs to be preassembled, then the threaded ring cover and the plug are screwed with the metal shell respectively, the piezoelectric ceramic disc and the metal disc are bonded by brushing a layer of glue on the contact surface of the piezoelectric ceramic disc and the metal disc when the curved disc type composite vibrator is preassembled, and the unqualified products can be removed after the glue is solidified, so that the glue no longer needs to be fixed on the lathe by using a special tool clamp for each transducer, the glue is ground along the front radiation end surface of the shell, which is beneficial to the large-scale automatic batch production, and the cost is reduced and the efficiency is improved; when the product is delivered or actually used, the glue no longer directly contacts the skin tissue of the patient, which is easy to pass the biocompatibility detection, the metal shell is attached to the negative surface of the piezoelectric element, the negative lead wire of the BNC cable is connected as the negative electrode, which plays a good shielding effect and prevents radiation and conduction interference, and is easy to pass the medical electrical equipment electromagnetic compatibility EMC detection, so that the ultrasonic tumor therapeutic instrument high-frequency ultrasonic transducer probe has the advantages of simple structure, easy assembly, good consistency, high yield, easy large-scale automatic mass production, easy biocompatibility detection and electromagnetic compatibility EMC detection of medical electrical equipment, and cost reduction and efficiency improvement are realized.

[0008] Preferably, in order to ensure the sealing effect of the curved disc type composite vibrator after assembly, the metal disc is provided with an outer step and an inner step outside, the outer step is sleeved with a first O-shaped sealing ring, and the inner step is sleeved with a second O-shaped sealing ring; the first O-shaped sealing ring and the second O-shaped sealing ring play the role of water tightness on the one hand, and on the other hand, they will not hinder the high-frequency low-amplitude vibration of the curved disc type composite vibrator through deformation, and the sound wave is radiated forward.

[0009] Preferably, the inner side of the threaded ring cover is provided with a sealing ring groove, and the first O-shaped sealing ring is located in the sealing ring groove; after the curved disc type composite vibrator is clamped in the threaded ring cover, the first O-shaped sealing ring is extruded in the sealing ring groove, so as to ensure the sealing effect of the curved disc type composite vibrator after assembly.

[0010] Preferably, in order to ensure the sealing effect of the upper end of the metal shell, a hollow rubber plug is arranged inside the metal shell below the plug, one end of the rubber plug is a tapered structure, the metal shell is provided with a step corresponding to the tapered structure of the rubber plug, when the plug is assembled with the metal shell, the tapered surface of the tapered structure of the rubber plug is deformed by the step to play a water-tight role, and an air cavity is formed between the rubber plug inside the metal shell and the curved disc composite vibrator, which can be used as a good air backing to make the sound energy radiate more forwardly.

[0011] Preferably, the height of the high-frequency ultrasonic transducer probe for the ultrasonic tumor treatment instrument is 51 mm, the outer diameter is 35 mm, the resonant frequency f r is 1 MHz ± 200 kHz, the resonant impedance is ≤ 100 Ω, the resonant capacitance is 10-12 nF, the power capacity is 1-6 W, the wire is selected to be an RG174 50-1.5 coaxial radio frequency wire shield 96 mesh braid, the threaded ring cover is made of aluminum material to prevent the screw thread from being locked, and the metal shell, the gasket and the plug are all made of 304 stainless steel.

[0012] Preferably, the diameter of the curved disc composite vibrator is 27.4 mm, and the thickness is 7.45 mm.

[0013] Preferably, the thickness of the piezoelectric ceramic disc is 1.5 mm, and the diameter is 25 mm.

[0014] Preferably, the piezoelectric ceramic disc adopts double-sided electrodes, which does not sacrifice the output power and reduces the cost of the element, the negative electrode surface of the piezoelectric ceramic disc is bonded with a metal disc, and the positive electrode wire of the BNC cable is welded on the positive electrode surface of the piezoelectric ceramic disc.

[0015] Preferably, the piezoelectric ceramic disc and the metal disc are bonded by epoxy resin.

[0016] The application also provides an assembling method of the high-frequency ultrasonic transducer probe for the ultrasonic tumor treatment instrument, which comprises the following steps:

[0017] Step one: brushing glue on the contact surfaces of the piezoelectric ceramic disc and the metal disc, extruding to expel bubbles, and then keeping warm and pressure until complete curing to bond the two to form a curved disc composite vibrator;

[0018] Step two: tightening the metal shell and the plug;

[0019] Step three: placing the BNC cable into the metal shell, welding the positive electrode wire of the BNC cable on the piezoelectric ceramic disc of the curved disc composite vibrator, and connecting the negative electrode wire of the BNC cable to the inner wall of the metal shell; and

[0020] Compared with the prior art, the application has the following beneficial effects:

[0021] (1) The high-frequency ultrasonic transducer probe for the ultrasonic tumor treatment instrument has simple structure, is easy to assemble, has good consistency, high yield, is conducive to large-scale automatic mass production, and in actual use, the metal shell is attached to the negative electrode surface of the piezoelectric element, the negative electrode lead wire of the connected BNC cable serves as the negative electrode, good shielding effect is achieved, radiation and conduction interference are prevented, EMC detection is easy, cost reduction and benefit increase are realized;

[0022] (2) The first O-shaped sealing ring and the second O-shaped sealing ring of the high-frequency ultrasonic transducer probe for the ultrasonic tumor treatment instrument play a water-tight role on one hand, and on the other hand, deformation does not hinder high-frequency low-amplitude vibration of the curved disc type composite vibrator, and sound waves are radiated forward;

[0023] (3) After the plug and the metal shell of the high-frequency ultrasonic transducer probe for the ultrasonic tumor treatment instrument are assembled, the tapered surface of the tapered structure of the rubber plug is extruded and deformed by the step to play a water-tight role, and an air cavity is formed between the rubber plug inside the metal shell and the curved disc type composite vibrator, which can serve as a good air backing, so that sound energy is radiated forward more. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 A sectional view of a high-frequency ultrasonic transducer probe for an ultrasonic tumor treatment instrument is provided for the present application;

[0025] Figure 2 A perspective view of a high-frequency ultrasonic transducer probe for an ultrasonic tumor treatment instrument is provided for the present application;

[0026] Figure 3 A plug perspective view of a high-frequency ultrasonic transducer probe for an ultrasonic tumor treatment instrument is provided for the present application;

[0027] Figure 4 A curved disc type composite vibrator perspective view of a high-frequency ultrasonic transducer probe for an ultrasonic tumor treatment instrument is provided for the present application;

[0028] Figure 5 A first O-shaped sealing ring and a second O-shaped sealing ring installation schematic view of a high-frequency ultrasonic transducer probe for an ultrasonic tumor treatment instrument is provided for the present application;

[0029] Figure 6 A threaded ring cover sectional view of a high-frequency ultrasonic transducer probe for an ultrasonic tumor treatment instrument is provided for the present application;

[0030] Figure 7 A rubber plug perspective view of a high-frequency ultrasonic transducer probe for an ultrasonic tumor treatment instrument is provided for the present application;

[0031] Figure 8A metal shell sectional view of a high-frequency ultrasonic transducer probe for an ultrasonic tumor therapeutic instrument is provided in the present application;

[0032] Figure 9 An explosion view of a high-frequency ultrasonic transducer probe for an ultrasonic tumor therapeutic instrument is provided in the present application.

[0033] In the figure: 1, curved disc type composite vibrator; 2, first O-shaped sealing ring; 3, second O-shaped sealing ring; 4, threaded ring cover; 5, metal shell; 51, step; 6, BNC cable; 7, plug; 8, gasket; 9, rubber plug; 10, positive lead; 11, negative lead; 12, air cavity; 13, piezoelectric ceramic disc; 14, metal disc; 141, outer step; 142, inner step. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0035] Embodiment one

[0036] Please refer to Figures 1-3 A high-frequency ultrasonic transducer probe for an ultrasonic tumor therapeutic instrument includes a curved disc type composite vibrator 1, a threaded ring cover 4, a metal shell 5, and a plug 7. The threaded ring cover 4 is threadedly connected with the bottom end of the metal shell 5, and the curved disc type composite vibrator 1 is clamped at the connection between the threaded ring cover 4 and the metal shell 5, with the bottom end of the curved disc type composite vibrator 1 flush with the bottom end of the threaded ring cover 4. The curved disc type composite vibrator 1 is sequentially bonded by a piezoelectric ceramic disc 13 and a metal disc 14. The plug 7 is threadedly connected with the top end of the metal shell 5, and both the plug 7 and the metal shell 5 are hollow structures. The BNC cable 6 passes through the hollow structures of the plug 7 and the metal shell 5 to enter the inside of the metal shell 5. The positive lead 10 of the BNC cable 6 is welded on the piezoelectric ceramic disc 13 of the curved disc type composite vibrator 1, and the negative lead 11 of the BNC cable 6 is connected with the inner wall of the metal shell 5. An air cavity 12 is formed between the inside of the metal shell 5 and the curved disc type composite vibrator 1, which can be used as a good air backing to make more sound energy radiate forward. The high-frequency ultrasonic transducer probe for the ultrasonic tumor therapeutic instrument has a simple structure, is easy to assemble, has good consistency, has a high yield, is conducive to large-scale automated mass production, and in actual use, the metal shell 5 is attached to the negative electrode surface of the piezoelectric element, and the negative lead 11 of the BNC cable 6 is connected as a negative electrode, which plays a good shielding effect, prevents radiation and transmission disturbance, is easy to pass the electromagnetic compatibility EMC detection of medical electrical equipment, and realizes cost reduction and efficiency increase.

[0037] Embodiment Two

[0038] An assembling method of a high-frequency ultrasonic transducer probe for an ultrasonic tumor therapeutic instrument, comprising the following steps:

[0039] Step one: glue is applied to the contact surface of the piezoelectric ceramic disc 13 and the metal disc 14, and after the air bubbles are squeezed out, the two are bonded to form a curved disc composite vibrator 1 after heat preservation and pressure preservation until complete solidification;

[0040] Step two: the metal shell 5 is tightened with the plug 7;

[0041] Step three: the BNC cable 6 is placed in the metal shell 5, the positive lead 10 of the BNC cable 6 is welded on the piezoelectric ceramic disc 13 of the curved disc composite vibrator 1, and the negative lead 11 of the BNC cable 6 is connected to the inner wall of the metal shell 5;

[0042] Step four: the curved disc composite vibrator 1 is tightened with the metal shell 5.

[0043] When assembling the high-frequency ultrasonic transducer probe for the ultrasonic tumor therapeutic instrument, only the curved disc composite vibrator 1 is pre-assembled, the BNC cable 6 is connected, and then the metal shell 5 and the plug 7 are tightened, without the need to fix each transducer with a special tool clamp on a lathe, and the glue is ground flat along the front radiation end surface of the shell, which is beneficial to large-scale automated mass production and effectively reduces costs and increases efficiency.

[0044] Embodiment Three

[0045] Please refer to Figure 9 A high-frequency ultrasonic transducer probe for an ultrasonic tumor therapeutic instrument, comprising a curved disc composite vibrator 1, a threaded ring cover 4, a metal shell 5, and a plug 7; the threaded ring cover 4 is threadedly connected with the bottom end of the metal shell 5, and the curved disc composite vibrator 1 is clamped at the connection therebetween, the curved disc composite vibrator 1 is bonded in sequence from a piezoelectric ceramic disc 13 and a metal disc 14, as shown in Figure 4 and 5 In order to ensure the sealing effect of the assembled curved disc composite vibrator 1, the outer side of the metal disc 14 is provided with an outer step 141 and an inner step 142, the outer step 141 is provided with a first O-shaped sealing ring 2, and the inner step 142 is provided with a second O-shaped sealing ring 3, as shown in Figure 6 The inner side of the threaded ring cover 4 is provided with a sealing ring groove 41, the first O-shaped sealing ring 2 is located in the sealing ring groove 41, and after the curved disc composite vibrator 1 is clamped in the threaded ring cover 4, the first O-shaped sealing ring 2 is squeezed in the sealing ring groove 41, and the bottom end of the metal disc 14 is flush with the bottom end of the threaded ring cover 4; the plug 7 is threadedly connected with the top end of the metal shell 5, and both the plug 7 and the metal shell 5 are hollow structures, as shown inFigure 7 As shown, in order to ensure the sealing effect of the upper end of the metal shell 5, a hollow rubber plug 9 is arranged inside the metal shell 5 below the plug 7, a gasket 8 is arranged between the rubber plug 9 and the plug 7, and the rubber plug 9 has a tapered structure at one end, as shown in Figure 8 As shown, the metal shell 5 is provided with a step 51 corresponding to the tapered structure of the rubber plug 9, and when the plug 7 is assembled with the metal shell 5, the tapered surface of the tapered structure of the rubber plug 9 is deformed by the step 51 to play a water-tight role. The rubber plug 9 inside the metal shell 5 and the curved disc composite vibrator 1 form an air cavity 12, which can be used as a good air backing to make the sound energy radiate more forwardly. The BNC cable 6 passes through the hollow structure of the plug 7, the rubber plug 9 and the metal shell 5 to enter the inside of the metal shell 5. The positive lead wire 10 of the BNC cable 6 is welded to the piezoelectric ceramic disc 13 of the curved disc composite vibrator 1. The negative lead wire 11 of the BNC cable 6 is connected to the inner wall of the metal shell 5. The piezoelectric ceramic disc 13 adopts double electrodes, which does not sacrifice the output power and reduces the cost of the element. The negative electrode surface of the piezoelectric ceramic disc 13 is bonded to a metal disc 14, and the positive lead wire 10 of the BNC cable 6 is welded to the positive electrode surface of the piezoelectric ceramic disc 13.

[0046] Since the piezoelectric ceramic disc 13 and the metal disc 14 must be flat enough to be firmly bonded, the bending vibration frequency fr depends on the diameter-thickness ratio of the curved disc composite vibrator 1, the material properties and the boundary support conditions.

[0047]

[0048] In the formula, A is a constant determined by the boundary support condition: A = 0.467 when the wave node is fixed; A = 0.233 when the periphery is fixed. In this paper, the periphery is fixed, so A is taken as 0.233. t is the thickness of the composite vibrator m, r is the radius of the composite vibrator m, the ratio X = r1 / r2 of the radius r1 of the piezoelectric ceramic disc to the radius r2 of the metal disc is greater than 0.7, and when X = 1, the impedance of the vibrator is the lowest. Y is the combined Young's modulus of the two materials Pa, and p is the combined density of the two materials kg / m 3 , and s is the combined Poisson's ratio of the two materials.

[0049] The free relative dielectric constant of the piezoelectric ceramic material is

[0050]

[0051] In the formula, ε0 is the dielectric constant of vacuum (or free space), ε0 = 8.85 x 10 -12 (F / m), and ε is the absolute dielectric constant, where F represents the unit of capacitance C t , which is farad.

[0052] The absolute dielectric constant ε and the capacitance Ct The relationship between the electrode area S and the electrode spacing t1 is

[0053]

[0054] where S is the electrode area m 2 , t1 is the electrode spacing m, C t is the resonance capacitance unit F.

[0055] The output parameter of the transducer is now estimated, assuming that the sound pressure radiated by the high-frequency transmitting ultrasonic transducer is F, in units of n, then

[0056]

[0057] For the bending disc type composite vibrator of the present application, a single piezoelectric element is used, then

[0058]

[0059] Substituting equation 3, we get

[0060]

[0061] Substituting equation 2, and assuming that the piezoelectric element of the bending disc type composite vibrator of the present application is a double-sided electrode and is a full electrode, then

[0062]

[0063] From equation 1, under the condition of fixed boundary conditions, the change of the resonance frequency f r is proportional to t / r 2 . The design requirement of the resonance frequency f r is 1 MHz ± 200 kHz, and equation 7 shows that the change of the radiated sound pressure F of the bending disc type composite vibrator is inversely proportional to t1 / r1 2 in size, and is proportional to in the inherent properties of the material. The vibrator vibrates in the thickness direction, and the piezoelectric element circular sheet with a diameter of 2r1 close to 10 times the thickness is required to ensure the directionality of the vibration.

[0064] Taking into account the piezoelectric strain constant d 33 of the piezoelectric ceramic disc 13 is 3.1 x 10-10 c / n, and the free relative dielectric constant is Further, the thickness t1 of the piezoelectric ceramic disc 13 is 1.5 mm, and the diameter 2r1 is Φ 25 mm.

[0065] The thickness of the metal disc 14 is only needed to make up the required design frequency. The diameter 2r of the curved disc compound vibrator is φ27.4mm, i.e. r=13.7mm, and the total thickness of the compound vibrator is t=7.45mm.

[0066] The above known formula 7 is substituted into formula 7, and

[0067] F≈12.61U(n) (formula 8)

[0068] That is, in theory, without considering the loss, the high-frequency ultrasonic transducer can radiate 12.61n acoustic pressure to the load for every 1V of electrical excitation, which meets the design requirements of ablation of superficial tumor tissue. The pathological section results of animal experiments also show that after ultrasonic treatment, the tumor tissue of the mouse has obvious necrosis and collapse, and no longer continues to grow, with good curative effect. After dissection, it is also shown that there is no substantial damage to other normal tissue organs of the mouse.

[0069] Finally, the total length of the high-frequency ultrasonic transducer probe of the ultrasonic tumor treatment instrument is 51mm, the outer diameter is Φ35mm, the resonant frequency f r is 1MHz±200kHz, the resonant impedance is ≤100Ω, the resonant capacitance is 10-12nF, and the power capacity is 1-6W. The wire is selected as RG17450-1.5 coaxial RF wire shielding 96 mesh braid.

[0070] Example Four

[0071] An assembly method of a high-frequency ultrasonic transducer probe for an ultrasonic tumor treatment instrument, comprising the following steps:

[0072] Step one: brush glue on the contact surface of the piezoelectric ceramic disc 13 and the metal disc 14, squeeze out the bubbles, and then keep warm and pressure until complete curing. Remove unqualified products for initial measurement, and obtain the curved disc compound vibrator 1;

[0073] Step two: assemble the first O-shaped sealing ring 2 and the second O-shaped sealing ring 3 on the metal disc 14;

[0074] Step three: place the rubber plug 9 into the metal shell 5, and then tighten the metal shell 5 with the plug 7;

[0075] Step four: place the BNC cable 6 into the metal shell 5, and weld the positive lead 10 of the BNC cable 6 on the piezoelectric ceramic disc 13 of the curved disc compound vibrator 1, and connect the negative lead 11 of the BNC cable 6 to the inner wall of the metal shell 5;

[0076] Step five: tighten the curved disc compound vibrator 1 with the metal shell 5.

[0077] Adopting the assembling method, the glue layer discharges bubbles through extrusion, ensuring the uniformity and consistency of the glue coating, improving the yield, and no longer needing to fix each transducer on the lathe with a special tool clamp, grinding the glue along the front radiation end surface of the shell, facilitating the large-scale, automated and batch production, and effectively realizing cost reduction and efficiency increase. When being inspected or actually used, the glue no longer directly contacts the patient's skin tissue, and is easy to pass the biocompatibility detection.

[0078] It is apparent to those skilled in the art that the application is not limited to the details of the foregoing exemplary embodiments, and that the application can be implemented in other specific forms without departing from the spirit or essential characteristics of the application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, the scope of the application being defined by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. No reference signs in the claims should be considered to be limiting the claim concerned.

Claims

1. A high-frequency ultrasonic transducer probe for an ultrasonic tumor therapeutic apparatus, characterized by: It comprises a curved disc composite vibrator (1), a threaded ring cover (4), a metal shell (5) and a plug (7). The threaded ring cover (4) is threadedly connected with the bottom end of the metal shell (5), the curved disc composite vibrator (1) is clamped at the connecting position of the threaded ring cover (4) and the metal shell (5), and the bottom end of the curved disc composite vibrator (1) is flush with the bottom end of the threaded ring cover (4); the curved disc composite vibrator (1) is formed by sequentially bonding a piezoelectric ceramic disc (13) and a metal disc (14). The plug (7) is threadedly connected with the top end of the metal shell (5), the plug (7) and the metal shell (5) are both hollow structures, the BNC cable (6) passes through the hollow structures of the plug (7) and the metal shell (5) and enters the metal shell (5), the positive lead wire (10) of the BNC cable (6) is welded on the piezoelectric ceramic disc (13) of the curved disc composite vibrator (1), and the negative lead wire (11) of the BNC cable (6) is connected with the inner wall of the metal shell (5).

2. The high-frequency ultrasonic transducer probe for an ultrasonic tumor therapeutic apparatus according to claim 1, characterized in that: The metal disc (14) is provided with an outer step (141) and an inner step (142) on the outer side, the outer step (141) is sleeved with a first O-shaped sealing ring (2), and the inner step (142) is sleeved with a second O-shaped sealing ring (3).

3. The high-frequency ultrasonic transducer probe for an ultrasonic tumor therapeutic apparatus according to claim 2, characterized in that: The inner side of the threaded ring cover (4) is provided with a sealing ring groove (41), and the first O-shaped sealing ring (2) is located in the sealing ring groove (41).

4. The high-frequency ultrasonic transducer probe for the ultrasonic tumor therapeutic apparatus according to any one of claims 1-3, characterized in that: A hollow rubber plug (9) is arranged below the plug (7) in the metal shell (5), one end of the rubber plug (9) is a tapered structure, and the metal shell (5) is provided with a step (51) corresponding to the tapered structure of the rubber plug (9).

5. The high-frequency ultrasonic transducer probe for an ultrasonic tumor therapeutic apparatus according to claim 1, characterized in that: The high frequency ultrasonic transducer probe for ultrasonic tumor therapeutic instrument has a height of 51 mm, an outer diameter of 35 mm, a resonance frequency f r of 1 MHz ± 200 kHz, a resonance impedance of ≤ 100 Ω, a resonance capacitance of 10-12 nF, and a power capacity of 1-6 W.

6. The high-frequency ultrasonic transducer probe for an ultrasonic tumor therapeutic apparatus according to claim 5, characterized in that: The diameter of the curved disc composite vibrator (1) is 27.4 mm, and the thickness is 7.45 mm.

7. The high-frequency ultrasonic transducer probe for an ultrasonic tumor therapeutic apparatus according to claim 6, characterized in that: The thickness of the piezoelectric ceramic disc (13) is 1.5 mm, and the diameter is 25 mm.

8. The high-frequency ultrasonic transducer probe for an ultrasonic tumor therapeutic apparatus according to claim 1, characterized in that: The piezoelectric ceramic disc (13) adopts double-sided electrodes, the metal disc (14) is bonded to the negative electrode surface of the piezoelectric ceramic disc (13), and the positive lead wire (10) of the BNC cable (6) is welded on the positive electrode surface of the piezoelectric ceramic disc (13).

9. The high-frequency ultrasonic transducer probe for an ultrasonic tumor therapeutic apparatus according to claim 1, characterized in that: The piezoelectric ceramic disc (13) and the metal disc (14) are bonded by epoxy resin glue.

10. An assembling method of the high-frequency ultrasonic transducer probe for the ultrasonic tumor therapeutic apparatus, applied to the high-frequency ultrasonic transducer probe for the ultrasonic tumor therapeutic apparatus as claimed in any one of claims 1-9, characterized in that: It comprises the following steps: Step one: brush glue on the contact surfaces of the piezoelectric ceramic disc (13) and the metal disc (14), extrude to expel bubbles, and then keep warm and pressure until complete curing to bond the two to form the curved disc composite vibrator (1); Step two: tighten the metal shell (5) and the plug (7); Step three: place the BNC cable (6) into the metal shell (5), weld the positive lead wire (10) of the BNC cable (6) on the piezoelectric ceramic disc (13) of the curved disc composite vibrator (1), and connect the negative lead wire (11) of the BNC cable (6) with the inner wall of the metal shell (5); Step four: tighten the curved disc composite vibrator (1) and the metal shell (5).

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