Laser-plasma driven cleaning instruments, cleaning devices and their control methods

Abstract

This invention discloses a laser-plasma-driven cleaning instrument, cleaning device, and its control method. The cleaning instrument includes a nozzle, a metal target, and an optical fiber for transmitting laser light. The end of the nozzle is the working end, and micropores are provided on the sidewall of the nozzle near the working end. The nozzle also has an injection port for injecting cleaning fluid with a preset hydraulic pressure, and the cleaning fluid flows towards the micropores. The metal target is at least partially located inside the nozzle and at the working end. The optical fiber is at least partially located inside the nozzle and has a transmitting end facing the metal target, with a certain distance between the transmitting end and the metal target. When the transmitting end emits a pulsed laser towards the metal target, plasma is formed on the surface of the metal target. When the plasma expands in the cleaning fluid, it drives the cleaning fluid to be ejected at high speed from the micropores on the sidewall to form a cavitation jet. This improves cleaning efficiency and the cleaning effect on the root canal wall, increases the cleaning range, and is less likely to damage the root canal wall.

Description

Technical Field

[0001] This invention relates to the field of dental treatment device technology, and in particular to a laser-plasma driven cleaning device, cleaning apparatus and control method thereof. Background Technology

[0002] Root canal treatment is currently a relatively ideal and mature treatment method for various diseases such as pulpitis, pulp necrosis, and tooth fracture. The main process involves using instruments to thoroughly clean the inside and walls of the diseased root canal, removing diseased tissue, and creating a complete and smooth root canal cavity. This completes the root canal preparation. Then, other materials, such as gutta-percha points, are filled into the prepared root canal to achieve the purpose of root canal repair and treatment.

[0003] Existing cleaning instruments have low cleaning efficiency, small cleaning range, poor cleaning effect on root canal walls, and are prone to damaging root canal walls. Summary of the Invention

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a laser-generated plasma-driven cleaning instrument, which improves cleaning efficiency and the cleaning effect on the root canal wall, increases the cleaning range, and is less likely to damage the root canal wall.

[0005] The present invention also aims to provide a laser-generated plasma-driven cavitation jet cleaning device.

[0006] The present invention also aims to propose a control method for using the above-mentioned cavitation jet cleaning device.

[0007] According to a first aspect of the present invention, a laser-generating plasma-driven cleaning device includes a nozzle, a metal target, and an optical fiber for transmitting laser light. The end of the nozzle is a working end, and a micro-hole is provided on the sidewall of the nozzle near the working end. The nozzle is also provided with a liquid injection port for injecting a cleaning fluid with a preset hydraulic pressure, and the cleaning fluid flows toward the micro-hole. The metal target is at least partially located inside the nozzle and at the working end. The optical fiber is at least partially located inside the nozzle and has a transmitting end facing the metal target, with a certain distance between the transmitting end and the metal target. When the transmitting end emits a pulsed laser toward the metal target, plasma can be formed on the surface of the metal target. When the plasma expands in the cleaning fluid, it drives the cleaning fluid to be ejected at high speed from the micro-hole on the sidewall to form a cavitation jet.

[0008] The laser-generated plasma-driven cleaning device according to the present invention emits pulsed laser light onto the metal target by an optical fiber at least partially disposed inside the nozzle and with the emitting end facing the metal target, causing plasma to be generated on the surface of the metal target. The plasma expands at the working end inside the nozzle, generating instantaneous high pressure, thereby driving the cleaning fluid inside the nozzle to be ejected from the micro-orifice height, forming a cavitation jet, which improves the cleaning efficiency and the cleaning effect on the root canal wall, increases the cleaning range, and is less likely to damage the root canal wall.

[0009] According to some embodiments of the present invention, the metal target material may be gold, platinum, iridium, tantalum, niobium, zirconium, or stainless steel, tungsten, titanium.

[0010] According to some embodiments of the present invention, the laser energy level is: single pulse energy: 25mJ-140mJ; pulse width: 60-150μs; and the distance between the emitting end and the metal target is less than 10mm.

[0011] According to some embodiments of the present invention, the diameter of the working end of the nozzle is between 0.2 mm and 3.0 mm, and the diameter of the side micro-holes on the nozzle near the working end is between 0.05 mm and 0.5 mm.

[0012] According to some embodiments of the present invention, the inner diameter of the working end of the nozzle ranges from 0.15 mm to 2.8 mm, and the outer diameter of the optical fiber ranges from 0.12 mm to 1.2 mm.

[0013] According to some embodiments of the present invention, the inner wall of the nozzle is provided with a positioning protrusion that abuts against the optical fiber.

[0014] According to some embodiments of the present invention, there are multiple positioning protrusions, and at least some of the positioning protrusions are arranged around the optical fiber so that the peripheral wall of the optical fiber is spaced apart from the peripheral wall of the nozzle.

[0015] The laser-generated plasma-driven cavitation jet cleaning apparatus of the second aspect of this application includes the laser-generated plasma-driven cleaning device, laser generator, liquid supply system, and controller described in the above embodiments. The laser generator is located outside the nozzle and is connected to an optical fiber to output laser light to the optical fiber. The liquid supply system includes a liquid supply pipe, a driving component, and a hydraulic detection component. The liquid supply pipe is connected to an injection port. The driving component is disposed on the liquid supply pipe to drive the cleaning liquid to flow toward the injection port. The hydraulic detection component is used to detect the actual hydraulic pressure supplied to the nozzle. The controller is electrically connected to the driving component, the hydraulic detection component, and the laser generator.

[0016] According to the embodiments of this application, the laser-generated plasma-driven cavitation jet cleaning device provides a laser generator to the cleaning equipment to generate plasma, provides a liquid supply system to provide a continuous cleaning fluid to the cleaning equipment so that the cleaning equipment can continuously perform cleaning work, and provides a controller to facilitate the continuous supply of cleaning fluid to the cleaning equipment to meet the preset hydraulic pressure, thereby enabling the cleaning equipment to achieve cavitation jet cleaning.

[0017] The control method of the cavitation jet cleaning device of the above embodiments according to the third aspect of this application, wherein the driving component is a drive motor, includes the following steps: when the actual hydraulic pressure is lower than the preset hydraulic pressure, the controller controls the motor to increase the speed; when the actual hydraulic pressure is higher than the preset hydraulic pressure, the controller controls the motor to decrease the speed.

[0018] According to the control method of this application embodiment, by setting the driving component as a driving motor, the actual hydraulic pressure of the cleaning fluid can be changed. In this way, the motor speed can be controlled to change according to the relationship between the actual hydraulic pressure and the preset hydraulic pressure, so that the actual hydraulic pressure is equal to the preset hydraulic pressure, so as to realize the subsequent cavitation jet.

[0019] The control method of the cavitation jet cleaning device of the above embodiments according to the fourth aspect of the present invention includes the following steps: when the actual hydraulic pressure is lower than the preset hydraulic pressure, the controller controls the laser generator to stop working; when the actual hydraulic pressure is equal to or exceeds the preset hydraulic pressure, the controller controls the laser generator to continue operating.

[0020] According to the control method of this application embodiment, the laser generator is controlled by the controller to adjust its working state according to the relationship between the actual hydraulic pressure and the preset hydraulic pressure, so as to avoid the laser generator from working ineffectively.

[0021] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a cleaning device according to an embodiment of the present invention;

[0023] Figure 2 This is a partial structural schematic diagram of a cleaning device according to an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the structure of a cleaning device according to an embodiment of the present invention.

[0025] Figure label:

[0026] 100 cleaning instruments

[0027] Nozzle 10, Working end 10a, Microhole 11, Injection port 12, Positioning protrusion 13, Cleaning fluid 14

[0028] Metal target 20, plasma 21

[0029] Fiber optic cable 30, transmitter 31, laser 31a,

[0030] Cleaning device 1000

[0031] Laser generator 200

[0032] Liquid supply system 300, liquid supply pipe 41, drive component 42, hydraulic detection component 43.

[0033] Controller 400. Detailed Implementation

[0034] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0035] The following disclosure provides numerous different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. Additionally, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the applicability of other processes and / or the use of other materials.

[0036] The following description, with reference to the accompanying drawings, describes a laser-generating plasma-driven cleaning device 100 and a laser-generating plasma-driven cavitation jet cleaning apparatus 1000 according to embodiments of the present invention.

[0037] Reference Figure 1 and Figure 2The laser-generated plasma-driven cleaning device 100 of the first aspect of the present invention includes a nozzle 10, a metal target 20, and an optical fiber 30 for conducting laser 31a. The end of the nozzle 10 is a working end 10a. A micro-hole 11 is provided on the side wall of the nozzle 10 near the working end 10a. The nozzle 10 is also provided with a liquid injection port 12 for injecting a cleaning fluid 14 with a preset hydraulic pressure. The cleaning fluid 14 flows toward the micro-hole 11. The metal target 20 is at least partially located inside the nozzle 10 and located at the working end 10a. The optical fiber 30 is at least partially located inside the nozzle 10. The optical fiber 30 has a transmitting end 31 facing the metal target 20. The transmitting end 31 and the metal target 20 are spaced apart. When the transmitting end 31 emits a pulsed laser 31a toward the metal target 20, a plasma 21 can be formed on the surface of the metal target 20. When the plasma 21 expands in the cleaning fluid 14, it drives the cleaning fluid 14 to be ejected at high speed from the side wall micro-hole 11 to form a cavitation jet.

[0038] Specifically, refer to Figure 1 and Figure 2 The laser-generated plasma-driven cleaning device 100 of this invention includes a nozzle 10 for spraying cleaning fluid 14 onto the root canal wall. The end of the nozzle 10 is a working end 10a, and micro-holes 11 are provided on the sidewall of the nozzle 10 near the working end 10a, through which the cleaning fluid 14 can be sprayed. The micro-holes 11 can be located on one side, multiple sides, or circumferentially on the nozzle 10. One or more micro-holes 11 can be provided. Preferably, multiple micro-holes 11 are provided and evenly distributed circumferentially along the nozzle 10. The nozzle 10 also has an injection port 12 for injecting cleaning fluid 14 with a preset hydraulic pressure. The injection port 12 can be located on the nozzle 10 at a position different from the micro-holes 11. For example, the injection port 12 can be located near the micro-holes 11, in the middle of the nozzle 10, or at the end of the nozzle 10 away from the working end 10a. Preferably, the injection port 12 is located at the end of the nozzle 10 away from the micropore 11. The cleaning fluid 14 flows toward the micropore 11 so that when the plasma 21 expands, the cleaning fluid 14 flowing to the vicinity of the micropore 11 can be ejected from the micropore 11.

[0039] Reference Figure 1 and Figure 2The metal target 20 is used to generate plasma 21. The metal target 20 is at least partially located inside the nozzle 10 and positioned at the working end 10a. This facilitates the generation of plasma 21 at the working end 10a within the nozzle 10. The instantaneous high pressure generated by the expansion of the plasma 21 drives the cleaning fluid 14 to be ejected from the micro-orifice 11, forming a cavitation jet. This improves cleaning efficiency and the cleaning effect on the root canal wall, increases the cleaning range, and minimizes damage to the root canal wall. The metal target 20 can be partially located inside the nozzle 10 and positioned at the working end 10a, or it can be entirely located inside the nozzle 10 and positioned at the working end 10a.

[0040] Reference Figure 1 and Figure 2 An optical fiber 30 is at least partially disposed within the nozzle 10. By placing the optical fiber 30 within the nozzle 10, the metal target 20 is irradiated, thereby generating plasma 21. The optical fiber 30 may be partially or entirely located within the nozzle 10. The optical fiber 30 has a transmitting end 31 facing the metal target 20 to emit laser 31a onto the metal target 20. The transmitting end 31 is spaced from the metal target 20 to protect the transmitting end 31 from damage.

[0041] Reference Figure 1 and Figure 2 When the pulsed laser 31a is emitted from the emitting end 31 toward the metal target 20, plasma 21 can be formed on the surface of the metal target 20. When the plasma 21 expands in the cleaning fluid 14, it drives the cleaning fluid 14 to be ejected at high speed from the side wall microholes 11 to form a cavitation jet, thereby improving the cleaning efficiency and the cleaning effect on the root canal wall, increasing the cleaning range, and making it less likely to damage the root canal wall.

[0042] Thus, the laser-generated plasma-driven cleaning device 100 according to the present invention emits pulsed laser 31a onto the metal target 20 by means of an optical fiber 30 at least partially disposed in the nozzle 10 and with the emitting end 31 facing the metal target 20, causing plasma 21 to be generated on the surface of the metal target 20. The plasma 21 expands at the working end 10a in the nozzle 10, generating instantaneous high pressure, thereby driving the cleaning fluid 14 in the nozzle 10 to be ejected from the micro-hole 11 at a height, forming a cavitation jet, which improves the cleaning efficiency and the cleaning effect on the root canal wall, increases the cleaning range, and is less likely to damage the root canal wall.

[0043] It should be noted that the preset hydraulic pressure is the hydraulic pressure required for the cleaning fluid 14 to flow out through the micropores 11.

[0044] In some embodiments of the present invention, the metal target 20 may be gold, platinum, iridium, tantalum, niobium, zirconium, or stainless steel, tungsten, titanium. Using the aforementioned metal target 20 facilitates the generation of plasma 21.

[0045] In some embodiments of the present invention, the energy level of the laser 31a is a single-pulse energy of 25mJ-140mJ; the pulse width is 60-150μs; and the distance between the emitting end 31 and the metal target 20 is less than 10mm. By setting the energy level of the laser 31a to a single-pulse energy of 25mJ-140mJ and a pulse width of 60-150μs, plasma 21 can be generated when the laser 31a irradiates the metal target 20. By setting the distance between the emitting end 31 and the metal target 20 to less than 10mm, the laser 31a can better act on the metal target 20, which is beneficial for the metal target 20 to generate plasma 21.

[0046] Specifically, the energy level of laser 31a can be a single pulse energy of 25mJ, 50mJ, 80mJ, 100mJ, 120mJ, 140mJ, etc. The pulse width can be 60μs, 70μs, 90μs, 100μs, 130μs, 150μs, etc. The distance between the emitting end 31 and the metal target 20 can be 10mm, 9mm, 7mm, 5mm, 4mm, 2mm, etc.

[0047] In some embodiments of the present invention, the diameter of the working end 10a of the nozzle 10 ranges from 0.2 mm to 3.0 mm, and the diameter of the micro-holes 11 on the side of the nozzle 10 adjacent to the working end 10a ranges from 0.05 mm to 0.5 mm. By setting the diameter of the working end 10a of the nozzle 10 to between 0.2 mm and 3.0 mm, it is easier to insert the nozzle 10 into the root canal. Setting the diameter of the micro-holes 11 on the side of the nozzle 10 adjacent to the working end 10a to between 0.05 mm and 0.5 mm allows the cleaning fluid 14 to form a cavitation jet after being sprayed from the micro-holes 11, improving cleaning efficiency and the cleaning effect on the root canal wall, increasing the cleaning range, and reducing the risk of damage to the root canal wall.

[0048] Specifically, the diameter of the working end 10a of the nozzle 10 can be in the range of 0.2mm, 0.4mm, 0.7mm, 1.2mm, 2.5mm, 3.0mm, etc. The diameter of the side micro-holes 11 on the nozzle 10 adjacent to the working end 10a can be 0.05mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.45mm, 0.5mm, etc.

[0049] In some embodiments, the microholes 11 may be provided on at least one of the side surface and bottom surface of the nozzle 10 near the working end 10a. Preferably, the microholes 11 are provided on the side surface and bottom surface of the nozzle 10 near the working end 10a.

[0050] In some embodiments of the present invention, the inner diameter of the working end 10a of the nozzle 10 ranges from 0.15 mm to 2.8 mm, and the outer diameter of the optical fiber 30 ranges from 0.12 mm to 1.2 mm. By setting the inner diameter of the working end 10a of the nozzle 10 to 0.15 mm to 2.8 mm, the nozzle 10 can have a certain accommodating cavity to accommodate the cleaning fluid 14 and the optical fiber 30. By setting the outer diameter of the optical fiber 30 to 0.12 mm to 1.2 mm, the optical fiber 30 can extend into the nozzle 10 to irradiate the metal target 20.

[0051] Specifically, the inner diameter of the working end 10a of the nozzle 10 can be 0.15mm, 0.25mm, 0.45mm, 0.9mm, 1.5mm, 1.7mm, 2.1mm, 2.5mm, 2.8mm, etc. The outer diameter of the optical fiber 30 can be 0.12mm, 0.15mm, 0.18mm, 0.35mm, 0.50mm, 0.70mm, 0.95mm, 1.2mm, etc.

[0052] In some embodiments, the overall inner diameter of the nozzle 10 can be set to 0.15mm-2.8mm. Alternatively, the inner diameter of the end of the nozzle 10 furthest from the working end 10a can be set to be larger than the inner diameter of the working end 10a. For example, it can be set to 3.0mm, 4.5mm, 5.0mm, etc.

[0053] In some embodiments of the present invention, reference is made to... Figure 1 The inner wall of the nozzle 10 is provided with a positioning protrusion 13 that abuts against the optical fiber 30. By providing the positioning protrusion 13 on the pipe wall of the nozzle 10, the optical fiber 30 is positioned, making it less likely for the optical fiber 30 to move within the nozzle 10, thereby improving the stability of the optical fiber 30 and thus improving the stability of plasma 21 generation.

[0054] It is understood that one or more positioning protrusions 13 can be provided. When multiple positioning protrusions 13 are provided, the positioning protrusions 13 can be spaced apart along the length direction of the nozzle 10; or they can be multiple groups spaced apart along the length direction of the nozzle 10, wherein each group is provided with multiple protrusions, and the multiple positioning protrusions 13 in each group can be provided on opposite sides of the inner wall of the nozzle 10, or they can be spaced apart circumferentially along the inner wall of the nozzle 10, or they can be uniformly provided circumferentially along the inner wall of the nozzle 10.

[0055] The positioning protrusion 13 and the optical fiber 30 can be connected point-to-point, line-to-line, or face-to-face. When the positioning protrusion 13 and the optical fiber 30 are connected line-to-line or face-to-face, the abutment line of the positioning protrusion 13 and the optical fiber 30 is arc-shaped, and the abutment surface is an arc surface.

[0056] In some embodiments of the present invention, reference is made to... Figure 1The positioning protrusions 13 are multiple, and at least some of the positioning protrusions 13 are arranged around the optical fiber 30 so that the peripheral wall of the optical fiber 30 is spaced apart from the peripheral wall of the nozzle 10. By setting at least some of the positioning protrusions 13 around the optical fiber 30, the peripheral wall of the optical fiber 30 is spaced apart from the peripheral wall of the nozzle 10, thus preventing the optical fiber 30 from contacting the inner wall of the nozzle 10 and blocking the micro-hole 11.

[0057] Preferably, multiple positioning protrusions 13 are arranged in multiple groups at intervals along the length of the nozzle 10, each group of positioning protrusions 13 is arranged around the optical fiber 30, and the multiple positioning protrusions 13 in each group are evenly distributed along the circumference of the optical fiber 30.

[0058] Reference Figure 3 The laser-generated plasma-driven cavitation jet cleaning apparatus 1000 of the second aspect of the present invention includes the laser-generated plasma-driven cleaning device 100, laser generator 200, liquid supply system 300 and controller 400 of the above embodiment. The laser generator 200 is located outside the nozzle 10 and is connected to the optical fiber 30 to output laser 31a to the optical fiber 30. The liquid supply system 300 includes a liquid supply pipe 41, a driving component 42 and a hydraulic detection component 43. The liquid supply pipe 41 is connected to the injection port 12. The driving component 42 is disposed on the liquid supply pipe 41 to drive the cleaning fluid 14 to flow toward the injection port 12. The hydraulic detection component 43 is used to detect the actual hydraulic pressure supplied to the nozzle 10. The controller 400 is electrically connected to the driving component 42, the hydraulic detection component 43 and the laser generator 200.

[0059] Specifically, refer to Figure 3A laser generator 200 is located outside the nozzle 10 and connected to an optical fiber 30 to output laser 31a to the optical fiber 30. Thus, laser 31a can be emitted from the emitting end 31 of the optical fiber 30 to form plasma 21 on the surface of the metal target 20. A liquid supply system 300 is used to supply cleaning fluid 14 to the cleaning instrument 100 so that the cleaning instrument 100 can continuously perform cleaning work. The liquid supply system 300 includes a supply pipe 41 connected to an injection port 12. By connecting the supply pipe 41 to the injection port 12, liquid can enter the nozzle 10 from the supply pipe 41 through the injection port 12. The supply pipe 41 and the nozzle 10 can be arranged perpendicularly. The liquid supply system 300 also includes a drive member 42, which is disposed on the supply pipe 41 to drive the cleaning fluid 14 to flow toward the injection port 12. By providing the drive member 42, it is convenient to make the cleaning fluid 14 flow toward the injection port 12. The drive unit 42 can be set with different drive powers to control the flow rate of the cleaning fluid 14 toward the injection port 12. The liquid supply system 300 also includes a hydraulic detection unit 43, which is used to detect the actual hydraulic pressure delivered to the nozzle 10 so that the hydraulic pressure can be adjusted by the drive unit 42 to ensure that the actual hydraulic pressure meets the requirements, which is conducive to the formation of a cavitation jet. The controller 400 is electrically connected to the drive unit 42, the hydraulic detection unit 43, and the laser generator 200. By setting the controller 400, which is electrically connected to the drive unit 42, the hydraulic detection unit 43, and the laser generator 200, the power of the drive unit 42 is automatically controlled so that the actual hydraulic pressure meets the preset hydraulic pressure, so that the laser 31a delivered by the laser generator 200 can form plasma 21 on the surface of the metal target 20, thereby realizing a cavitation jet.

[0060] According to an embodiment of this application, the laser-generated plasma-driven cavitation jet cleaning apparatus 1000 provides a laser generator 200 to the cleaning device 100 to generate plasma 21 using a laser 31a. A liquid supply system 300 provides a continuous cleaning fluid 14 to the cleaning device 100 so that the cleaning device 100 can continuously perform cleaning work. A controller 400 is provided to facilitate the continuous supply of cleaning fluid 14 to the cleaning device 100 to meet a preset hydraulic pressure, thereby enabling the cleaning device 100 to achieve cavitation jet cleaning.

[0061] The control method of the third aspect of the present invention applied to the cavitation jet cleaning device 1000 of the above embodiment, wherein the driving member 42 is a driving motor, includes the following steps: when the actual hydraulic pressure is lower than the preset hydraulic pressure, the controller 400 controls the motor to increase the speed; when the actual hydraulic pressure is higher than the preset hydraulic pressure, the controller 400 controls the motor to decrease the speed.

[0062] According to the control method of this application embodiment, by setting the drive unit 42 as a drive motor, the actual hydraulic pressure of the cleaning fluid 14 can be changed. In this way, the motor speed can be controlled to change according to the relationship between the actual hydraulic pressure and the preset hydraulic pressure, so that the actual hydraulic pressure is equal to the preset hydraulic pressure, so as to realize the subsequent cavitation jet.

[0063] The control method of the fourth aspect embodiment of the present invention applied to the cavitation jet cleaning device 1000 of the above embodiment includes the following steps: when the actual hydraulic pressure is lower than the preset hydraulic pressure, the controller 400 controls the laser generator 200 to stop working; when the actual hydraulic pressure is equal to or exceeds the preset hydraulic pressure, the controller 400 controls the laser generator 200 to continue operating.

[0064] According to the control method of this application embodiment, the controller 400 controls the laser generator 200 to adjust its working state according to the relationship between the actual hydraulic pressure and the preset hydraulic pressure, so as to avoid the laser generator 200 from working ineffectively.

[0065] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0066] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0067] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0068] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0069] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A laser-generated plasma-driven cleaning device, characterized in that, Cleaning of the root canal walls, including: The nozzle (10) has a working end (10a) at its end. Microholes (11) are provided on the side wall of the nozzle (10) near the working end (10a). The nozzle (10) is also provided with an injection port (12). The injection port (12) is used to inject cleaning fluid (14) with a preset hydraulic pressure, and the cleaning fluid (14) flows toward the microholes (11). A metal target (20) is at least partially located inside the nozzle (10) and disposed at the working end (10a); An optical fiber (30) for conducting laser (31a) is at least partially disposed within the nozzle (10), the optical fiber (30) having a transmitting end (31) disposed toward the metal target (20), the transmitting end (31) being spaced apart from the metal target (20). When the emitting end (31) emits a pulsed laser toward the metal target (20), plasma (21) can be formed on the surface of the metal target (20). When the plasma (21) expands in the cleaning liquid (14), it drives the cleaning liquid (14) to be ejected from the micropore (11) at high speed to form a cavitation jet. The laser (31a) has the following energy levels: single pulse energy: 25mJ-140mJ; pulse width: 60-150μs; and the distance between the emitting end (31) and the metal target (20) is less than 10mm. The diameter of the working end (10a) of the nozzle (10) is between 0.2 mm and 3.0 mm, and the diameter of the microhole (11) on the side of the nozzle (10) near the working end (10a) is between 0.05 mm and 0.5 mm.

2. The laser-generated plasma-driven cleaning device according to claim 1, characterized in that, The metal target (20) is gold, platinum, iridium, tantalum, niobium, zirconium, stainless steel, tungsten or titanium.

3. The laser-generated plasma-driven cleaning device according to claim 1, characterized in that, The inner diameter of the working end (10a) of the nozzle (10) ranges from 0.15 mm to 2.8 mm, and the outer diameter of the optical fiber (30) ranges from 0.12 mm to 1.2 mm.

4. The laser-generated plasma-driven cleaning device according to any one of claims 1-3, characterized in that, The inner wall of the nozzle (10) is provided with a positioning protrusion (13) that abuts against the optical fiber (30).

5. The laser-generated plasma-driven cleaning device according to claim 4, characterized in that, There are multiple positioning protrusions (13), and at least some of the positioning protrusions (13) are arranged around the optical fiber (30) so that the peripheral wall of the optical fiber (30) is spaced apart from the peripheral wall of the nozzle (10).

6. A laser-generated plasma-driven cavitation jet cleaning device, characterized in that, include: The laser-generated plasma-driven cleaning device (100) according to any one of claims 1-5; A laser generator (200) is located outside the nozzle (10) and connected to the optical fiber (30) to output laser (31a) to the optical fiber (30). A liquid supply system (300) includes a liquid supply pipe (41), a drive unit (42), and a hydraulic detection unit (43). The liquid supply pipe (41) is connected to the injection port (12). The drive unit (42) is disposed on the liquid supply pipe (41) to drive the cleaning fluid (14) to flow toward the injection port (12). The hydraulic detection unit (43) is used to detect the actual hydraulic pressure supplied to the nozzle (10). The controller (400) is electrically connected to the drive unit (42), the hydraulic detection unit (43), and the laser generator (200).

7. A control method applied to the cavitation jet cleaning apparatus according to claim 6, characterized in that, The driving component (42) is a drive motor, and includes the following steps: When the actual hydraulic pressure is lower than the preset hydraulic pressure, the controller (400) controls the motor to increase its speed; When the actual hydraulic pressure is higher than the preset hydraulic pressure, the controller (400) controls the motor to reduce its speed.

8. A control method applied to the cavitation jet cleaning apparatus according to claim 6, characterized in that, Includes the following steps: When the actual hydraulic pressure is lower than the preset hydraulic pressure, the controller (400) controls the laser generator (200) to stop working; When the actual hydraulic pressure is equal to or exceeds the preset hydraulic pressure, the controller (400) controls the laser generator (200) to continue operating.

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