Preparation method and application of disposable sterile sound conducting pad

Abstract

The invention belongs to the technical field of ultrasonic sound guide pad preparation, and particularly relates to a preparation method and application of a disposable sterile sound guide pad, the preparation method comprises the following steps: preparing raw materials including trichlorohydroxydiphenyl ether, glycerol, triethanolamine, xanthan gum, carrageenan and purified water; the preparation method comprises the following steps: uniformly mixing trichlorohydroxydiphenyl ether and glycerol to obtain a solution I; dissolving xanthan gum and carrageenan in purified water to obtain a solution II; uniformly mixing the solution I and the solution II to obtain a hydrogel solution; adjusting the pH value of the hydrogel solution; pressurizing and injecting the hydrogel solution into a mold by using sterile sound conducting pad production equipment; putting the mold containing the hydrogel solution into a refrigerator for refrigeration; compared with the prior art, the two vacuumizing devices in the sterile sound conducting pad production device can vacuumize the space between the hydrogel solution and the pressurizing piston in the container and the space in the mold, and air is exhausted in time in the sound conducting pad preparation process.

Description

Technical Field

[0001] The invention belongs to the technical field of preparation of ultrasonic sound-conducting pads, and in particular relates to a preparation method and application of a disposable sterile sound-conducting pad. Background Art

[0002] Hydrogel is a polymer material with a three-dimensional network structure that can absorb and retain a large amount of water. This material has good elasticity and biocompatibility, so it is widely used in the biomedical field. In terms of acoustic properties, the acoustic impedance of hydrogel is similar to that of human tissue, which makes it a matching layer material for ultrasonic transducers.

[0003] Bubbles in hydrogels can affect their performance and aesthetics. Bubbles form voids or air pockets within the hydrogel that can weaken the strength and durability of the bond, leading to weakened bonds, structural damage, and even premature degradation. Bubbles can also act as stress concentration points, making the hydrogel more susceptible to failure when subjected to environmental stresses.

[0004] The main reason for the formation of bubbles in hydrogel is that the air is not completely expelled during the production process: during the production process, if the air is not completely expelled, bubbles will form inside the hydrogel. Summary of the invention

[0005] The present invention aims at the technical problems existing in the production of hydrogel sound-conducting pads in the prior art and provides a preparation method and application of a disposable sterile sound-conducting pad.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is: a method for preparing a disposable sterile sound-conducting pad, comprising the following steps: Step 1: Prepare raw materials, including trichlorohydroxydiphenyl ether, propylene glycol, triethanolamine, xanthan gum, carrageenan and purified water; Step 2: Evenly mix trichlorohydroxydiphenyl ether and propylene glycol to obtain solution 1; dissolve xanthan gum and carrageenan in purified water, and stir thoroughly with a stirrer until the xanthan gum and carrageenan are completely dissolved to obtain solution 2; Step 3: Evenly mix solution 1 and solution 2 to obtain a hydrogel solution; Step 4: adjusting the pH value of the hydrogel solution using triethanolamine; Step 5: Using sterile sound-conducting pad production equipment, pressurize the hydrogel solution into the mold; Step 6: Put the mold containing the hydrogel solution into a refrigerator to allow the hydrogel solution in the mold to gradually form a sterile sound-conducting pad in a gel state; Step 7: Remove the sterile sound-conducting pad in gel state from the mold and package it.

[0007] Preferably, the sterile acoustic guiding pad production equipment includes a container, a pressure piston, and two vacuum pumping devices; the container is filled with a uniformly mixed hydrogel solution; the pressure piston is located in the upper part of the container and is slidably connected to the inner wall of the container; a liquid outlet pipe is installed at the lower end of the container, and a first valve is installed on one side of the liquid outlet pipe close to the container; the two vacuum pumping devices can respectively evacuate the space between the hydrogel solution in the container and the pressure piston and the space in the mold. Before the hydrogel solution is pressure-injected into the mold in step five, the space in the mold is in a vacuum state; then the pressure piston pushes the hydrogel solution in the container into the space in the mold and maintains the pressure for a certain period of time.

[0008] Preferably, the two vacuum pumping devices are respectively a first vacuum pumping device and a second vacuum pumping device; the first vacuum pumping device includes a first vacuum pump and a first air pipe, and the second vacuum pumping device includes a second vacuum pump and a second air pipe. The pressure piston is provided with a vertical through hole, and the first air pipe is communicated with the upper part of the through hole; the pressure piston is further provided with a rotary valve, and the rotary valve can control the opening and closing of the lower part of the through hole. The mold includes an upper mold and a lower mold, and a funnel part is fixedly connected to the upper end of the upper mold; the lower end of the second air pipe is provided with a second joint part, and the outer periphery of the second joint part can fit the inner surface of the funnel part; the second joint part is fixed above the mold.

[0009] Preferably, the lower end of the liquid outlet pipe of the container is fixedly connected with a first joint part, and the outer periphery of the first joint part can fit the inner surface of the funnel part of the mold; elastic sealing layers are fixedly connected to the outer peripheries of the first joint part and the second joint part.

[0010] Preferably, the sterile acoustic guiding pad production equipment further includes a turntable, a first servo motor, and a lifting device; a plurality of the molds are evenly and detachably connected to the outer periphery of the upper surface of the turntable; the first servo motor is installed below the middle of the turntable and is drivingly connected to the turntable; the lifting device is installed below the first servo motor and can drive the first servo motor and the turntable to lift.

[0011] Preferably, the upper part of the funnel part is an inverted frustum shape, and the lower part is a straight pipe shape; a second valve is installed at the lower part of the funnel part; threaded seats are respectively fixedly provided at both ends in the length direction of the lower mold, locking blocks are fixedly provided at the corresponding positions of the upper mold, the locking blocks are provided with internal threads, and the upper mold and the lower mold can be fitted by sequentially screwing bolts with the locking blocks and the threaded seats; an elastic sealing layer is fixedly provided at the joint of the lower mold and the upper mold.

[0012] Preferably, the second air pipe further includes a pipeline main body, and the pipeline main body connects the second vacuum pump and the second joint part.

[0013] Preferably, the rotary valve includes a second servo motor, a transmission shaft and a valve plate; the valve plate is fan-shaped; the second servo motor is installed on the upper surface of the pressure piston; the transmission shaft is drivingly connected to the output end of the second servo motor; the end of the transmission shaft away from the second servo motor is fixedly connected to the center of the fan shape of the valve plate; A fan-shaped cavity is formed at the corresponding position of the lower part inside the pressure piston corresponding to the through hole, and the valve plate can rotate relative to the fan-shaped cavity.

[0014] Preferably, the sterile acoustic pad production equipment further includes a hydraulic cylinder, the hydraulic cylinder includes a piston rod, and the end of the piston rod is fixedly connected to the upper surface of the pressure piston.

[0015] An application of a disposable sterile acoustic pad, using the sterile acoustic pad produced by the preparation method for a disposable sterile acoustic pad as an auxiliary acoustic guiding device for medical ultrasonic examinations.

[0016] Compared with the prior art, the advantages and positive effects of the present invention are as follows: (1) Adding triclosan to the ultrasonic acoustic pad can keep the ultrasonic acoustic pad in a sterile state for a long time; (2) The two vacuum pumping devices in the sterile acoustic pad production equipment can respectively evacuate the space between the hydrogel solution in the container and the pressure piston and the space in the mold, and discharge air in time during the production process of the acoustic pad; (3) A rotary valve is installed on the pressure piston, and the rotary valve can control the opening and closing of the lower part of the through hole; when the through hole is opened, the first vacuum pumping device can evacuate the space between the hydrogel solution in the container and the pressure piston; when the through hole is closed, the pressure piston can apply pressure to the hydrogel solution in the container, push the hydrogel solution in the container into the space in the mold and maintain the pressure for a certain period of time; (4) The lower end of the second air pipe is provided with a second joint part, and the outer periphery of the second joint part can fit the inner surface of the funnel part; an elastic sealing layer I is fixedly connected to the outer periphery of the second joint part; the above technical solutions enable the second joint part to fit the inner surface of the funnel part of the mold, and the second vacuum pumping device can evacuate the inside of the mold; (5) The lower end of the liquid outlet pipe of the container is fixedly connected with a first joint part, and the outer periphery of the first joint part can fit the inner surface of the funnel part of the mold; the above technical solutions enable the sterile acoustic pad production equipment to inject the hydrogel solution into the mold under pressure and maintain the pressure for a certain period of time; (6) The sterile acoustic pad production equipment further includes a turntable, a first servo motor and a lifting device; a plurality of molds are evenly and detachably connected to the outer periphery of the upper surface of the turntable; the above technical solutions enable the use of the sterile acoustic pad production equipment to continuously produce sterile acoustic pads with high efficiency; (7) Both xanthan gum and carrageenan are raw materials for making hydrogels, and the molecular weight of xanthan gum is significantly greater than that of carrageenan. By adjusting their relative amounts in the hydrogel solution, the density and viscosity of the prepared hydrogel sound guide pad can be adjusted, thereby preparing sound guide pads with different acoustic impedances. Description of the Drawings

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments: Figure 1 Schematic diagram of the sterile sound guide pad production equipment used in the preparation method for a disposable sterile sound guide pad Figure 1 ; Figure 2 Schematic diagram of the sterile sound guide pad production equipment used in the preparation method for a disposable sterile sound guide pad Figure 2 ; Figure 3 Schematic diagram of the pressure piston in the sterile sound guide pad production equipment Figure 1 ; Figure 4 Schematic diagram of the pressure piston in the sterile sound guide pad production equipment Figure 2 ; Figure 5 Schematic diagram of the rotary valve of the pressure piston in the sterile sound guide pad production equipment; Figure 6 Schematic diagram of the container in the sterile sound guide pad production equipment; Figure 7 Schematic diagram of the turntable, servo motor 1 and lifting device in the sterile sound guide pad production equipment; Figure 8 Top view of the turntable in the sterile sound guide pad production equipment; Figure 9 Schematic diagram of the mold used in the preparation method for a disposable sterile sound guide pad; Figure 10 Schematic diagram of the second air pipe in the sterile sound guide pad production equipment; Figure 11 Schematic diagram of the sterile sound guide pad produced by using the preparation method for a disposable sterile sound guide pad; Figure 12 Sterility test results of the disposable sterile sound guide pad prepared in Example 1; Figure 13 Acoustic performance test results of the disposable sterile sound guide pad prepared in Example 1.

[0018] Description of the reference numerals: 1. Container, 11. First joint part, 12. First valve; 2. pressurizing piston, 21. rotary valve, 22. fan-shaped cavity; 211. servo motor 2, 212. transmission shaft, 213. valve plate; 3. Hydraulic cylinder, 4. Turntable; 5. mold, 51. funnel part, 52. valve 2, 53. lower mold, 54. threaded seat, 55. locking block, 56. bolt, 57. upper mold; 6. Servo motor 1, 7. Lifting device; 81. Trachea 1, 82. Trachea 2, 821. Connector 2, 822. Pipeline body. DETAILED DESCRIPTION

[0019] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described below with reference to the accompanying drawings and embodiments.

[0020] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0021] Example 1 Combine the following Figures 1 - 11 The preparation method of a disposable sterile sound conductive pad in Example 1 is further described. The preparation method comprises the following steps: Step 1: prepare raw materials, including 3 parts of trichlorohydroxydiphenyl ether, 75 parts of glycerol, 30 parts of triethanolamine, 150 parts by weight of xanthan gum, 20 parts of carrageenan and 500 parts of purified water; Step 2: Evenly mix trichlorohydroxydiphenyl ether and propylene glycol to obtain solution 1; dissolve xanthan gum and carrageenan in purified water, and stir thoroughly with a stirrer until the xanthan gum and carrageenan are completely dissolved to obtain solution 2; Step 3: Evenly mix solution 1 and solution 2 to obtain a hydrogel solution; Step 4: adjusting the pH value of the hydrogel solution using triethanolamine; Step 5: Use sterile sound-conducting pad production equipment (such as Figure 1 and Figure 2 As shown), the hydrogel solution is pressurized and injected into the mold 5; Step 6: Put the mold 5 containing the hydrogel solution into a refrigerator to allow the hydrogel solution in the mold 5 to gradually form a sterile sound-conducting pad in a gel state; Step 7: Remove the sterile acoustic pad in gel state from the mold 5 (such as Figure 11 as shown) and packaged.

[0022] like Figure 1 and Figure 2As shown in the figure, the aseptic acoustic guide pad production equipment includes a container 1, a pressure piston 2, and two vacuum pumping devices. The container 1 is filled with a uniformly mixed hydrogel solution; the pressure piston 2 is located in the upper part of the container 1 and is slidably connected to the inner wall of the container 1; a liquid outlet pipe is installed at the lower end of the container 1, and a first valve 12 is installed on one side of the liquid outlet pipe close to the container 1. The two vacuum pumping devices can respectively evacuate the space between the hydrogel solution in the container 1 and the pressure piston 2 and the space in the mold 5.

[0023] Before injecting the hydrogel solution into the mold 5 under pressure in step five, the space in the mold 5 is in a vacuum state; then the pressure piston 2 pushes the hydrogel solution in the container 1 into the space in the mold 5 and maintains the pressure for a certain period of time (1 minute in this embodiment).

[0024] As Figure 1 shown, the two vacuum pumping devices are respectively a first vacuum pumping device and a second vacuum pumping device; the first vacuum pumping device includes a first vacuum pump and a first air pipe 81, and the second vacuum pumping device includes a second vacuum pump and a second air pipe 82.

[0025] As Figures 3 - 5 shown, the pressure piston 2 is provided with a vertical through hole, and the first air pipe 81 communicates with the upper part of the through hole; the pressure piston 2 is also equipped with a rotary valve 21, and the rotary valve 21 can control the opening and closing of the lower part of the through hole.

[0026] As Figure 9 shown, the mold 5 includes an upper mold 57 and a lower mold 53, and a funnel part 51 is fixedly connected to the upper end of the upper mold 57; the lower end of the second air pipe 82 is provided with a second connector 821, and the outer circumference of the second connector 821 can fit the inner surface of the funnel part 51; the second connector 821 is fixed above the mold 5.

[0027] As Figure 1 and Figure 2 shown, the lower end of the liquid outlet pipe of the container 1 is fixedly connected to a first connector 11, and the outer circumference of the first connector 11 can fit the inner surface of the funnel part 51 of the mold 5; elastic sealing layers are fixedly connected to the outer circumferences of both the first connector 11 and the second connector 821.

[0028] As Figure 2 and Figure 7 shown, the aseptic acoustic guide pad production equipment further includes a turntable 4, a first servo motor 6, and a lifting device 7.

[0029] As Figure 7 and Figure 8 shown, a plurality of molds 5 are evenly and detachably connected to the outer circumference of the upper surface of the turntable 4; the first servo motor 6 is installed below the middle of the turntable 4 and is drivingly connected to the turntable 4; the lifting device 7 is installed below the first servo motor 6 and can drive the first servo motor 6 and the turntable 4 to lift.

[0030] As Figure 9As shown, the upper part of the funnel 51 is an inverted frustum of a cone, and the lower part is a straight pipe; a second valve 52 is installed at the lower part of the funnel 51. At both ends of the lower mold 53 in the length direction, thread seats 54 are fixedly provided respectively. At the corresponding positions of the upper mold 57 and the thread seats 54, locking blocks 55 are fixedly provided. The locking blocks 55 are provided with internal threads. By sequentially threading the bolts 56 with the locking blocks 55 and the thread seats 54, the upper mold 57 and the lower mold 53 can be fitted; an elastic sealing layer II is fixedly provided at the joint of the lower mold 53 and the upper mold 57.

[0031] As Figure 10 shown, the second air pipe 82 further includes a pipe body 822, and the pipe body 822 connects the second vacuum pump and the second joint 821.

[0032] As Figure 5 shown, the rotary valve 21 includes a second servo motor 211, a transmission shaft 212 and a valve plate 213; the valve plate 213 is fan-shaped; the second servo motor 211 is installed on the upper surface of the pressure piston 2; the transmission shaft 212 is drivingly connected to the output end of the second servo motor 211; the end of the transmission shaft 212 away from the second servo motor 211 is fixedly connected to the center of the fan shape of the valve plate 213.

[0033] As Figure 4 shown, a fan-shaped cavity 22 is provided at the corresponding position of the lower inner part of the pressure piston 2 and the through hole, and the valve plate 213 can rotate relative to the fan-shaped cavity 22.

[0034] As Figure 1 shown, the sterile sound guide pad production equipment further includes a hydraulic cylinder 3, and the hydraulic cylinder 3 includes a piston rod, and the end of the piston rod is fixedly connected to the upper surface of the pressure piston 2.

[0035] An application of a disposable sterile sound guide pad, using the sterile sound guide pad produced by the above-mentioned preparation method for a disposable sterile sound guide pad (as Figure 11 shown) as an auxiliary sound guide device for medical ultrasonic examinations.

[0036] The test report content of the disposable sterile sound guide pad prepared in this embodiment is as follows (an electronic test report can be provided): Model specification: 120mm×110mm×7mm; the test results of the sterility performance are as Figure 12 shown; the test results of the acoustic performance are as Figure 13 shown.

[0037] Example 2 The difference between this embodiment and Embodiment 1 is that: in this embodiment, the shape of the sterile sound guide pad is different from that in Embodiment 1, and the corresponding mold 5 is changed. The preparation process for preparing a disposable sterile sound guide pad using the sterile sound guide pad production equipment is as follows: A plurality of molds 5 are evenly and detachably connected to the outer periphery of the upper surface of the turntable 4; the second joint 821 of the second air pipe 82 is fixed above the mold 5 on the turntable 4; the container 1 is also fixed above the mold 5 on the turntable 4. The first joint 11 of the container 1 and the second joint 821 of the second air pipe 82 are respectively aligned with the funnel parts 51 of different molds 5.

[0038] After the second joint 821 of the second air pipe 82 fits the inner surface of the funnel part 51 of the corresponding mold 5, the second vacuum pumping device evacuates the inside of the corresponding mold 5. After the evacuation is completed, the second valve 52 of the corresponding mold 5 is closed.

[0039] While the second vacuum pumping device evacuates the inside of the corresponding mold 5, the outer periphery of the first joint 11 of the container 1 fits the inner surface of the funnel part 51 of the corresponding mold 5; the pressurizing piston 2 pressurizes and injects the hydrogel solution into the mold 5 (in a vacuum state before injection) and keeps the pressure for a certain period of time.

[0040] The lifting device 7 drives the first servo motor 6 and the turntable 4 to descend, and then the first servo motor 6 drives the turntable 4 to rotate by a set angle. At this time, the mold 5 that has completed internal evacuation rotates to directly below the first joint 11 of the container 1, and then the lifting device 7 drives the turntable 4 to rise. The outer periphery of the first joint 11 of the container 1 fits the inner surface of the funnel part 51 of the corresponding mold 5; the second valve 52 is opened, and the pressurizing piston 2 pressurizes and injects the hydrogel solution into the mold 5 and keeps the pressure for a certain period of time. At the same time, the second vacuum pumping device has completed the internal evacuation of the subsequent mold 5.

[0041] Repeat the above process until the hydrogel solution is injected into all the molds 5 on the turntable 4, and then remove each mold 5 and put it in the refrigerator for refrigeration.

[0042] The above is only a preferred embodiment of the present invention, and it is not a limitation of the present invention in other forms. Any person skilled in the art may use the disclosed technical content to make changes or modifications into equivalent embodiments with equivalent changes and apply them to other fields. However, as long as it does not depart from the technical solution content of the present invention, any simple modification and equivalent change made to the above embodiments according to the technical essence of the present invention still belong to the protection scope of the technical solution of the present invention.

Claims

1. A preparation method for a disposable sterile acoustic pad, characterized in that, The following steps are involved: Step 1: Prepare raw materials, including trichlorohydroxydiphenyl ether, propylene glycol, triethanolamine, xanthan gum, carrageenan and purified water; Step 2: Evenly mix trichlorohydroxydiphenyl ether and propylene glycol to obtain solution 1; dissolve xanthan gum and carrageenan in purified water, and stir thoroughly with a stirrer until the xanthan gum and carrageenan are completely dissolved to obtain solution 2; Step 3: Evenly mix solution 1 and solution 2 to obtain a hydrogel solution; Step 4: adjusting the pH value of the hydrogel solution using triethanolamine; Step 5: Using a sterile sound-conducting pad production device, pressurize the hydrogel solution into the mold (5); Step 6: placing the mold (5) containing the hydrogel solution in a refrigerator to allow the hydrogel solution in the mold (5) to gradually form a sterile sound-conducting pad in a gel state; Step 7: Remove the sterile sound-conducting pad in the gel state from the mold (5) and package it.

2. The preparation method of the disposable sterile acoustic guiding pad according to claim 1, wherein The aseptic sound-conducting pad production equipment comprises a container (1), a pressurizing piston (2) and two vacuum extraction devices; The container (1) contains a uniformly mixed hydrogel solution; the pressurizing piston (2) is located in the upper part of the container (1) and is slidably connected to the inner wall of the container (1); a liquid outlet pipe is installed at the lower end of the container (1), and a valve (12) is installed on the side of the liquid outlet pipe close to the container (1); The two vacuuming devices are capable of respectively vacuuming the space between the hydrogel solution in the container (1) and the pressurizing piston (2) and the space in the mold (5); Before the hydrogel solution is pressurized and injected into the mold (5) in step 5, the space inside the mold (5) is in a vacuum state; then the pressurizing piston (2) pushes the hydrogel solution in the container (1) into the space inside the mold (5) and maintains the pressure for a certain period of time.

3. The preparation method of the disposable sterile acoustic guiding pad according to claim 2, wherein The two vacuum pumping devices are vacuum pumping device 1 and vacuum pumping device 2 respectively; the vacuum pumping device 1 comprises vacuum pump 1 and air pipe 1 (81), and the vacuum pumping device 2 comprises vacuum pump 2 and air pipe 2 (82); The pressurizing piston (2) is provided with a vertical through hole, and the air pipe (81) is connected to the upper part of the through hole; the pressurizing piston (2) is also provided with a rotary valve (21), and the rotary valve (21) can control the opening and closing of the lower part of the through hole; The mold (5) comprises an upper mold (57) and a lower mold (53); the upper end of the upper mold (57) is fixedly connected to a funnel portion (51); the lower end of the second air pipe (82) is provided with a second joint portion (821); the outer periphery of the second joint portion (821) can fit the inner surface of the funnel portion (51); the second joint portion (821) is fixed on the top of the mold (5).

4. The preparation method of the disposable sterile acoustic guiding pad according to claim 3, characterized in that, The lower end of the liquid outlet pipe of the container (1) is fixedly connected to a joint part 1 (11), and the outer periphery of the joint part 1 (11) can fit the inner surface of the funnel part (51) of the mold (5); the outer peripheries of the joint part 1 (11) and the joint part 2 (821) are both fixedly connected to an elastic sealing layer 1.

5. The preparation method of the disposable sterile acoustic pad according to claim 4, characterized in that, The sterile sound conductive pad production equipment also includes a turntable (4), a servo motor (6) and a lifting device (7); A plurality of the molds (5) are evenly and detachably connected to the outer periphery of the upper surface of the turntable (4); the first servo motor (6) is installed below the middle of the turntable (4) and is drivingly connected to the turntable (4); the lifting device (7) is installed below the first servo motor (6) and can drive the first servo motor (6) and the turntable (4) to lift.

6. The preparation method of the disposable sterile acoustic guiding pad according to claim 5, characterized in that, The upper part of the funnel part (51) is an inverted frustum of a cone, and the lower part is a straight pipe; a second valve (52) is installed at the lower part of the funnel part (51); Threaded seats (54) are fixedly arranged at both ends in the length direction of the lower mold (53), locking blocks (55) are fixedly arranged at positions corresponding to the threaded seats (54) on the upper mold (57), internal threads are provided in the locking blocks (55), and the upper mold (57) and the lower mold (53) can be fitted by sequentially threadedly connecting the locking blocks (55) and the threaded seats (54) with bolts (56); an elastic sealing layer II is fixedly arranged at the joint of the lower mold (53) and the upper mold (57).

7. The preparation method of the disposable sterile acoustic pad according to claim 3, characterized in that, The second air pipe (82) further includes a pipeline main body (822), and the pipeline main body (822) connects the second vacuum pump and the second joint part (821).

8. The preparation method of the disposable sterile acoustic guiding pad according to claim 3, wherein The rotary valve (21) includes a second servo motor (211), a transmission shaft (212) and a valve plate (213); the valve plate (213) is fan-shaped; the second servo motor (211) is installed on the upper surface of the pressure piston (2); the transmission shaft (212) is drivingly connected to the output end of the second servo motor (211); the end of the transmission shaft (212) away from the second servo motor (211) is fixedly connected to the center of the fan shape of the valve plate (213); A fan-shaped cavity (22) is provided at a position corresponding to the through hole in the lower part of the pressure piston (2), and the valve plate (213) can rotate relative to the fan-shaped cavity (22).

9. The preparation method of the disposable sterile acoustic guiding pad according to claim 2, characterized in that, The sterile sound guide pad production equipment further includes a hydraulic cylinder (3), the hydraulic cylinder (3) includes a piston rod, and the end of the piston rod is fixedly connected to the upper surface of the pressure piston (2).

10. A disposable sterile acoustic pad application, characterized in that, The sterile sound guide pad produced by the preparation method for a disposable sterile sound guide pad according to any one of claims 1-9 is used as an auxiliary sound guide device for medical ultrasonic examination.

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