Root canal irrigation handpiece

Abstract

The embodiment of the application discloses a root canal flushing hand tool, wherein the root canal flushing hand tool comprises a hand tool body, a light path transmission structure and a light transmission piece; the light path transmission structure is arranged inside the hand tool body; the light transmission piece is arranged at one end of the hand tool body, the light transmission piece has a light guide channel between a first surface and a second surface, and the light path transmission structure is connected with the light guide channel through the first surface; wherein the light transmission piece is used for forming a solid-liquid interface with flushing liquid in a target liquid domain through the second surface; the target liquid domain comprises at least one of a liquid domain formed in a pulp cavity and a liquid domain communicated with the pulp cavity; the light path transmission structure is used for transmitting the received laser beam into the flushing liquid in the target liquid domain through the light guide channel and the solid-liquid interface, forming a focal point in the flushing liquid in the target liquid domain, and generating a photo-induced breakdown effect in the flushing liquid by using laser energy, inducing plasma cavitation to activate the flushing liquid, so as to flush the root canal.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of stomatological medical instruments, and particularly relates to a root canal flushing hand tool. BACKGROUND

[0002] Pulp and periapical diseases are common and frequently-occurring diseases in stomatological clinics, and the treatment thereof is mainly completed through root canal treatment. Root canal treatment generally includes three main steps, i.e., root canal preparation and shaping, root canal flushing, and root canal filling. Among them, root canal flushing is an important link for infection control of root canal treatment.

[0003] In the related art, root canal flushing can be performed through laser-induced plasma activation (LIPA), and cavitation bubbles are generated in the liquid by using the optical breakdown effect of laser on the liquid to generate an optical focusing point and an optical breakdown effect in the liquid. However, this method has the problem of unstable optical breakdown effect, which affects the cleaning effect of the root canal. SUMMARY

[0004] Therefore, the embodiments of the present application at least provide a root canal flushing hand tool, which can reduce the influence of liquid level fluctuation of the flushing liquid on the focal point position, improve the stability of the laser light path, so that the laser can more stably generate optical breakdown effect on the flushing liquid to form cavitation bubbles, and improve the cleaning effect of the root canal.

[0005] The technical solutions of the embodiments of the present application are implemented as follows:

[0006] The embodiments of the present application provide a root canal flushing hand tool, which comprises:

[0007] a hand tool body;

[0008] a light path transmission structure arranged inside the hand tool body;

[0009] a light transmission piece arranged at one end of the hand tool body, the light transmission piece having a light guide channel between a first surface and a second surface thereof, and the light path transmission structure being optically connected with the light guide channel through the first surface;

[0010] The light transmission piece is used to form a solid-liquid interface with the flushing liquid in a target liquid domain through the second surface; the target liquid domain comprises at least one of a liquid domain formed in a pulp cavity and a liquid domain communicated with the pulp cavity.

[0011] The light path transmission structure is used to transmit the received laser beam to the flushing liquid in the target liquid domain through the light guide channel and the solid-liquid interface, form a focal point in the flushing liquid in the target liquid domain, and induce plasma cavitation activation of the flushing liquid by using the optical breakdown effect of laser energy in the flushing liquid to flush the root canal.

[0012] In some embodiments, the light-transmitting member has a cavity formed therein, the second surface comprises a top wall of the cavity, and the target liquid domain comprises a liquid domain formed in the cavity.

[0013] In some embodiments, the bottom wall and / or the side wall of the cavity has at least one opening for communicating the cavity and the pulp cavity, and the jet flow is formed from the flushing liquid in the cavity to the pulp cavity through the at least one opening after the flushing liquid is activated.

[0014] In some embodiments, the side of the cavity away from the top wall has a first cross section, and the side of the cavity close to the top wall has a second cross section, and the area of the first cross section is smaller than the area of the second cross section.

[0015] In some embodiments, the side of the cavity away from the top wall has at least one flow guide channel connecting the cavity and the at least one opening.

[0016] In some embodiments, the long axis of the handpiece body extends along a first direction;

[0017] The light path transmission structure is configured to output the received laser beam along a first direction, the first surface intersects the first direction, and the flow direction of the jet flow intersects the first direction; or,

[0018] The light path transmission structure is configured to output the received laser beam along a second direction, the first surface intersects the second direction, and the flow direction of the jet flow is the same as the second direction, and the second direction is perpendicular to the first direction.

[0019] In some embodiments, the target liquid domain further comprises a liquid domain formed in the pulp cavity.

[0020] In some embodiments, the second surface comprises a bottom surface of the light-transmitting member, and the target liquid domain comprises a liquid domain formed in the pulp cavity.

[0021] In some embodiments, the long axis of the handpiece body extends along a first direction;

[0022] The light path transmission structure comprises a first optical reflection structure configured to reflect the received laser beam along the first direction to be output along a third direction, and the laser beam output along the third direction is transmitted to the light guide channel through the first surface; or,

[0023] The light guide channel comprises a second optical reflection structure configured to reflect the laser beam output along the first direction by the light path transmission structure to be output along a third direction, and the laser beam output along the third direction is transmitted to the flushing liquid in the target liquid domain through the solid-liquid interface;

[0024] Wherein, the third direction is perpendicular to the first direction.

[0025] In some embodiments, the first optical reflection structure comprises a first reflection focusing structure, the first reflection focusing structure being configured to reflect and focus the received laser beam along the first direction, so as to focus the laser beam into the flushing liquid in the target liquid domain along the third direction via the light guide channel and the solid-liquid interface; or,

[0026] The second optical reflection structure comprises a second reflection focusing structure, the second reflection focusing structure being configured to reflect and focus the laser beam along the first direction output by the light path transmission structure, so as to focus the laser beam into the flushing liquid in the target liquid domain along the third direction via the solid-liquid interface.

[0027] In some embodiments, the light path transmission structure comprises a first optical focusing structure, the first optical focusing structure being configured to focus the received laser beam, so as to focus the laser beam into the flushing liquid in the target liquid domain via the light guide channel and the solid-liquid interface;

[0028] The light guide channel is provided with a second optical focusing structure, the second optical focusing structure being configured to focus the laser beam output by the light path transmission structure, so as to focus the laser beam into the flushing liquid in the target liquid domain via the solid-liquid interface.

[0029] In some embodiments, the light-transmitting piece has a support structure, the support structure being configured to support the light-transmitting piece, so as to support the light-transmitting piece at the opening of the dental pulp cavity; and / or,

[0030] The bottom of the light-transmitting piece is in a tapered narrowing structure, the tapered narrowing structure being configured to support the light-transmitting piece, so as to support the light-transmitting piece at the opening of the dental pulp cavity.

[0031] The root canal flushing hand tool provided by the embodiment of the present application comprises a hand tool body, a light path transmission structure, and a light transmission piece. The light path transmission structure is arranged inside the hand tool body. The light transmission piece is arranged at one end of the hand tool body. The light transmission piece has a light guide channel between a first surface and a second surface. The light path transmission structure is connected with the light guide channel through the first surface. The second surface is used to form a solid-liquid interface with flushing liquid in a target liquid domain. The target liquid domain comprises at least one of a liquid domain formed in a pulp cavity and a liquid domain communicated with the pulp cavity. The light path transmission structure is used to transmit the received laser beam into the flushing liquid in the target liquid domain through the light guide channel and the solid-liquid interface, form a focal point in the flushing liquid in the target liquid domain, and generate a photo-induced breakdown effect in the flushing liquid by using laser energy, induce plasma cavitation to activate the flushing liquid, and flush the root canal. The light transmission piece in the root canal flushing hand tool can form a solid-liquid interface with the flushing liquid in the target liquid domain through the second surface, so that the laser beam is transmitted into the flushing liquid in the target liquid domain through the light guide channel in the light transmission piece and the solid-liquid interface. The focal point is formed in the flushing liquid in the target liquid domain. In this way, the transmission path of the laser beam does not need to pass through the gas-liquid interface of air and flushing liquid, so that the influence of the liquid surface fluctuation of the flushing liquid on the focal point position can be reduced, the stability of the laser light path is improved, and then the laser can more stably produce a photo-induced breakdown effect on the flushing liquid to form a cavitation bubble, and the root canal cleaning effect is improved. In addition, since the stability of the laser light path is improved, after the flushing liquid is broken by the laser beam to form a cavitation bubble, the laser beam can be output again to break the flushing liquid again, so that a higher laser working frequency can be supported, the generation efficiency of the cavitation bubble is improved, and the root canal cleaning effect is further improved.

[0032] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, but not limiting the technical solutions of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 The composition structure of the root canal flushing hand tool provided by the embodiment of the present application Figure One ;

[0034] Figure 2 The composition structure of the light transmission piece provided by the embodiment of the present application Figure One ;

[0035] Figure 3 The implementation schematic of the focusing mode provided by the embodiment of the present application Figure One ;

[0036] Figure 4 The implementation schematic of the focusing mode provided by the embodiment of the present application Figure Two ;

[0037] Figure 5 An implementation schematic of a focusing mode provided for an embodiment of the present application Figure Three ;

[0038] Figure 6 A composition structure schematic of a light-transmitting piece provided for an embodiment of the present application Figure Two ;

[0039] Figure 7 An opening mode schematic of a light-transmitting piece provided for an embodiment of the present application Figure One ;

[0040] Figure 8 An opening mode schematic of a light-transmitting piece provided for an embodiment of the present application Figure Two ;

[0041] Figure 9 An opening mode schematic of a light-transmitting piece provided for an embodiment of the present application Figure Three ;

[0042] Figure 10 An opening mode schematic of a light-transmitting piece provided for an embodiment of the present application Figure Four ;

[0043] Figure 11 An implementation schematic of a focusing mode provided for an embodiment of the present application Figure Four ;

[0044] Figure 12 An implementation schematic of a focusing mode provided for an embodiment of the present application Figure Five ;

[0045] Figure 13 A composition structure schematic of a light-transmitting piece provided for an embodiment of the present application Figure Three ;

[0046] Figure 14 An implementation schematic of a focusing mode provided for an embodiment of the present application Figure Six ;

[0047] Figure 15 An implementation schematic of a focusing mode provided for an embodiment of the present application Figure Seven ;

[0048] Figure 16 An implementation schematic of a focusing mode provided for an embodiment of the present application Figure Eight ;

[0049] Figure 17 An implementation schematic of a focusing mode provided for an embodiment of the present application Figure Nine ;

[0050] Figure 18 An implementation schematic of a focusing mode provided for an embodiment of the present applicationFigure Ten ;

[0051] Figure 19 A schematic view of a support structure provided for an embodiment of the present application;

[0052] Figure 20 A schematic view of a bottom part of a light-transmitting member provided for an embodiment of the present application;

[0053] Figure 21 A schematic view of a component structure of a root canal irrigation handpiece provided for an embodiment of the present application Figure Two ;

[0054] Figure 22 A schematic view of a component structure of a root canal irrigation handpiece provided for an embodiment of the present application Figure Three ;

[0055] Figure 23 A schematic view of a component structure of a root canal irrigation handpiece provided for an embodiment of the present application Figure Four . DETAILED DESCRIPTION DETAILED DESCRIPTION

[0056] In order to make the objectives, technical solutions and advantages of the present application clearer, the technical solutions of the present application are further described in detail below with reference to the drawings and embodiments. The described embodiments should not be regarded as limiting the present application, and all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present application.

[0057] In the following description, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present disclosure. The terms "first / second / third" are merely to distinguish similar objects, and do not represent a specific order or sequence of the objects. Understandably, "first / second / third" can be interchanged in a specific order or sequence as allowed, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0058] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used herein are only for the purpose of describing the present application and are not intended to limit the present application. In addition, it should be noted that only parts related to the present application are shown in the drawings for the convenience of description.

[0059] The terms "set", "connected" should be understood broadly. For example, it can be fixed connection, or detachable connection, or integrally connected. It can be detachable connection, or electrical connection. It can be directly connected, or indirectly connected through an intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0060] In addition, the technical features involved in different embodiments of the application described below can be combined with each other as long as there is no conflict between them.

[0061] In the related art, the commonly used root canal irrigation methods include traditional needle irrigation, ultrasonic irrigation, acoustic irrigation and laser irrigation, etc.

[0062] Needle irrigation completes root canal irrigation by using a metal irrigation needle and a syringe. The metal irrigation needle is inserted into the root canal during irrigation, and the root canal irrigation is completed by injecting irrigation liquid into the root canal. Needle irrigation has no cavitation effect, and the flow rate of the irrigation liquid is low, which is difficult to reach all areas in the root canal, especially the root canal area of the apical segment and some anatomical variation areas (such as the isthmus area, the apical triangular area and the lateral branch root canal, etc.), thus the cleaning effect of the root canal is limited;

[0063] Ultrasonic irrigation uses piezoelectric ceramics or magnetic expansion principle to activate the file needle by using ultrasonic energy, so as to produce stirring activation effect on the liquid, and further uses the cavitation effect around the file needle to make the liquid flow at high speed. However, after the metal irrigation file needle of ultrasonic irrigation enters the root canal, due to metal fatigue, the complexity of the root canal system, and the bending of the root canal itself, the file needle may be broken in the root canal, or the metal irrigation file needle may cause damage to the inner wall of the root canal (such as forming a step on the inner wall of the root canal, or even perforating the root canal), that is, intraoperative complications occur, which may harm the patient;

[0064] Acoustic irrigation uses acoustic energy to drive a non-metallic file needle into the root canal, and stirs the liquid in the root canal by the vibration of the file needle. The cleaning effect of acoustic irrigation is weaker than that of ultrasonic irrigation, and the non-metallic file needle used for acoustic irrigation may also be broken in the root canal.

[0065] Laser activated irrigation (LAI) mainly uses laser energy to act on the irrigation liquid. After the irrigation liquid absorbs the laser energy of a specific wavelength, the temperature of the liquid in the local area instantaneously rises and reaches the boiling point, and a vapor bubble is generated. Through the generation, expansion, oscillation and collapse of the vapor bubble, acoustic effects (thermal expansion, light breakdown, cavitation, etc.) are generated in the liquid, and high-speed microjets are generated in the liquid through cavitation, which plays a mechanical flushing role.

[0066] And the working principle of LAI is to use a gem working tip or an optical fiber to transmit laser energy, to form a light spot by laser irradiation under the liquid surface by placing the gem working tip or the optical fiber tip under the liquid surface of the root canal irrigation liquid in the pulp cavity, to make the liquid instantaneously heated to the boiling point by the pulsed laser with a short pulse width and a high peak power in the liquid, and to activate the liquid by generating a vapor bubble to play an irrigation role. Since this method realizes the irrigation of the root canal in the manner that the gem working tip or the optical fiber tip is in contact with the irrigation liquid, in the case where the distance between the gem working tip or the optical fiber tip and the root canal is not accurately controlled, there is a safety risk, the operation is difficult, and the gem working tip may be broken in the root canal or the pulp cavity, causing iatrogenic trauma.

[0067] On this basis, when the laser irradiation energy exceeds the breakdown threshold of the liquid, a photo-induced breakdown effect occurs in the liquid, which is specifically manifested as the generation of a bright plasma flash, and then the generation of a cavitation bubble, the generation, expansion, oscillation and quenching of the cavitation bubble, the radiation of sound waves into the liquid, and the generation of high-speed microjets in the activated liquid. The LIPA method using this principle uses nanosecond (such as 10 ns or shorter pulse width) pulsed laser, and the wavelength of the laser is in the wavelength range in which the energy is not easily absorbed by water. Through the pulse energy and the optical focusing system, an optical focusing point and a photo-induced breakdown effect are generated in the liquid, which can improve the cleaning effect. The wavelength in which the energy is not easily absorbed by water can include but is not limited to the near-ultraviolet wavelength range, the visible light wavelength range and / or the near-infrared wavelength range, etc. For example, the laser with a wavelength of 1064 nm can be used in the LIPA method.

[0068] However, the liquid flow and the fluctuation of the liquid surface caused by the generation, expansion, oscillation and quenching of the cavitation bubble will affect the effective focusing of the optical focusing point and cause the position of the optical focusing point to be unstable, which will result in the failure to effectively generate plasma under each laser pulse irradiation, and there is a problem that the cleaning effect is not as expected.

[0069] The embodiments of the present application provide a root canal irrigation hand tool, which can improve the problem that the optical focusing point of the root canal irrigation hand tool using the LIPA method is unstable during use and causes poor cleaning effect, such as Figure 1 As shown in the figure, the root canal irrigation hand tool 100 includes a hand tool body 110, an optical path transmission structure 120 and a light-transmitting piece 130.

[0070] The optical path transmission structure 120 is arranged inside the hand tool body 110;

[0071] The light-transmitting piece 130 is arranged at one end of the hand tool body 110, and the light-transmitting piece 130 has a light guide channel between the first face and the second face, and the optical path transmission structure 120 is optically connected with the light guide channel through the first face;

[0072] The light-transmitting piece 130 is configured to form a solid-liquid interface with the flushing liquid in the target liquid domain on the second surface; the target liquid domain includes at least one of the following: a liquid domain formed in the pulp cavity, a liquid domain communicated with the pulp cavity;

[0073] The light path transmission structure 120 is configured to transmit the received laser beam into the flushing liquid in the target liquid domain through the light guide channel and the solid-liquid interface, form a focal point in the flushing liquid in the target liquid domain, and generate a photo-induced breakdown effect in the flushing liquid by using the laser energy, induce plasma cavitation to activate the flushing liquid, and perform root canal irrigation.

[0074] Here, the light path transmission structure 120 has a light guide function, which is configured to receive the laser beam and transmit it to the light guide channel.

[0075] The flushing liquid can be used to clean and disinfect the root canal by physical flushing and / or chemical action, and can be any suitable root canal flushing liquid determined according to the actual situation in the pulp cavity, which is not limited in the embodiments of the present application. For example, the flushing liquid can include, but is not limited to, at least one of distilled water, physiological saline, hydrogen peroxide, ethylenediaminetetraacetic acid (EDTA) solution, sodium hypochlorite solution, chlorhexidine solution, etc.

[0076] The laser beam is transmitted by the light path transmission structure 120 to the first surface of the light-transmitting piece 130, enters the light guide channel, and then enters the flushing liquid in the target liquid domain after passing through the solid-liquid interface formed based on the second surface of the light-transmitting piece 130.

[0077] It can be understood that the focal point is formed in the flushing liquid in the target liquid domain after the laser beam passes through the solid-liquid interface, and there is no gas-liquid interface in the transmission path of the laser beam, so that the influence of the liquid surface fluctuation caused by the generation, expansion, oscillation and quenching of the cavitation bubble on the position of the focal point can be reduced.

[0078] In some embodiments, the cross-sectional area of the first surface of the light-transmitting piece can be greater than, equal to, or less than the cross-sectional area of the second surface of the light-transmitting piece, which is not limited in the embodiments of the present application.

[0079] In some embodiments, the light path transmission structure 120 can include a focusing structure configured to focus the laser beam and form a focal point.

[0080] For example, as shown in Figure 2 The focusing structure 20 can be a focusing convex lens; the first surface of the light-transmitting piece 130 is surface 21, the second surface of the light-transmitting piece 130 can be surface 22, the light guide channel 23 is formed between the surface 21 and the surface 22, the liquid domain 24 communicated with the pulp cavity is formed inside the light-transmitting piece 130, the liquid domain 25 is formed in the pulp cavity, the surface 22 forms a solid-liquid interface with the flushing liquid in the liquid domain 24; the liquid domain 24 can correspond to the above-mentioned target liquid domain;

[0081] In this case, the laser beam passes through the focusing structure 20 and exits, passes through the face 21 and the light guide channel 23, further passes through the face 22 and the solid-liquid interface formed by the flushing liquid in the liquid domain 24, and focuses in the liquid domain 24 to form a focal point; the flushing liquid at the focal point is broken by the laser energy, generates a photo-induced breakdown effect, induces plasma cavitation to activate the flushing liquid, and the activated flushing liquid is ejected from the liquid outlet 28 to flush the root canal.

[0082] In some embodiments, the flushing liquid in the liquid domain 24 can be injected from outside, and the light-transmitting piece 130 can include a liquid injection port 26, an air outlet 27, and a liquid outlet 28, so that the area where the light-transmitting piece 130 communicates with the pulp cavity is filled with the flushing liquid to form the liquid domain 24.

[0083] In some embodiments, the face of the light-transmitting piece 130 that contacts the flushing liquid in the pulp cavity can be an inner surface of the light-transmitting piece 130 (such as the face 22 in the above example), or an outer surface of the light-transmitting piece 130 (such as the face 29 in the following example).

[0084] For example, referring to the light-transmitting piece structure in Figure 2 , the first face of the light-transmitting piece 130 is the face 21, and the second face of the light-transmitting piece 130 can be the face 29, the light guide channel is formed between the face 21 and the face 29, and the face 29 forms a solid-liquid interface with the flushing liquid in the liquid domain 25; the liquid domain 25 can correspond to the above target liquid domain;

[0085] In this case, the laser beam passes through the focusing structure 20 and exits, passes through the face 21 and enters the liquid domain 24, passes through the face 29 and the solid-liquid interface formed by the flushing liquid in the liquid domain 25, and focuses in the liquid domain 25 to form a focal point; the flushing liquid at the focal point is broken by the laser energy, generates a photo-induced breakdown effect, induces plasma cavitation to activate the flushing liquid, and flushes the root canal.

[0086] For example, as shown in Figure 3 , the light path transmission structure 120 can include a focusing structure 30; the first face of the light-transmitting piece 130 is the face 31, and the second face of the light-transmitting piece 130 can be the face 32, the light guide channel 33 is formed between the face 31 and the face 32, the liquid domain 34 is formed inside the light-transmitting piece 130 and communicates with the pulp cavity, the liquid domain 35 is formed in the pulp cavity, and the face 32 forms a solid-liquid interface with the flushing liquid in the liquid domain 34; the liquid domain 34 and the liquid domain 35 can correspond to the above target liquid domain;

[0087] The light-transmitting piece 130 restricts the boundary of the flushing liquid flow in the liquid domain 34, the flushing liquid is injected into the cavity where the light-transmitting piece 130 communicates with the pulp cavity through the liquid injection port 37 to form the liquid domain 34, and the light guide channel 33 can be a high-transparency structure so that the laser beam passes through the face 31 and the face 32 to form a focal point;

[0088] The laser beam passes through the focusing structure 30 and exits, passes through the light guide channel 33 via the surface 31, further passes through the surface 32 and the solid-liquid interface formed by the irrigating liquid in the liquid domain 34, and focuses in the liquid domain 35 to form a focal point 36; the irrigating liquid at the focal point 36 is broken by the laser energy to produce a photo-induced breakdown effect, induce plasma cavitation to activate the irrigating liquid, and perform root canal irrigation.

[0089] Exemplarily, as shown in Figure 4 The light path transmission structure 120 can include a focusing structure 40; the first surface of the light-transmitting piece 130 is a surface 41, the second surface of the light-transmitting piece 130 is a surface 42, a light guide channel 43 is formed between the surface 41 and the surface 42, the light guide channel 43 can include a cavity structure or be a solid light guide medium, the cavity structure of the light guide channel 43 can be a hollow structure or a non-hollow structure with a filler, a liquid domain 44 is formed in the pulp cavity, and the surface 42 forms a solid-liquid interface with the irrigating liquid in the liquid domain 44; the liquid domain 44 can correspond to the above-mentioned target liquid domain;

[0090] The laser beam passes through the focusing structure 40 and exits, passes through the light guide channel 43 via the surface 41, further passes through the surface 42 and the solid-liquid interface formed by the irrigating liquid in the liquid domain 44, and focuses in the liquid domain 44 to form a focal point 45; the irrigating liquid at the focal point 45 is broken by the laser energy to produce a photo-induced breakdown effect, induce plasma cavitation to activate the irrigating liquid, and perform root canal irrigation.

[0091] The light-transmitting piece 130 is used to transmit the light of the laser and expel the liquid above the focal point, and the part of the light-transmitting piece 130 in contact with the liquid domain 44 is in a sealed state.

[0092] In some embodiments, the shell of the hand tool body 110 can be elongated as a whole and have a concave design suitable for finger gripping according to the size and gripping habit of human hands, so as to facilitate operation in the oral cavity.

[0093] In some embodiments, the shell of the hand tool body 110 can be made of a high-temperature-resistant and corrosion-resistant material.

[0094] In some embodiments, the light-transmitting piece 130 is a part of the root canal irrigation hand tool 100, but the light-transmitting piece 130 can be a module of the root canal irrigation hand tool 100 and be independently detachable. In this way, the light-transmitting piece 130 can be detached from the root canal irrigation hand tool and replaced, thereby reducing the replacement cost of the root canal irrigation hand tool.

[0095] The root canal flushing hand tool provided in the embodiments of the present application comprises a hand tool body, a light path transmission structure and a light transmission piece. The light path transmission structure is arranged inside the hand tool body. The light transmission piece is arranged at one end of the hand tool body. The light transmission piece has a light guide channel between a first surface and a second surface. The light path transmission structure is connected with the light guide channel through the first surface. The light transmission piece is used to form a solid-liquid interface with flushing liquid in a target liquid domain through the second surface. The target liquid domain comprises at least one of a liquid domain formed in a pulp cavity and a liquid domain communicated with the pulp cavity. The light path transmission structure is used to transmit the received laser beam into the flushing liquid in the target liquid domain through the light guide channel and the solid-liquid interface, form a focal point in the flushing liquid in the target liquid domain, and generate a photo-induced breakdown effect in the flushing liquid by using laser energy, induce plasma cavitation to activate the flushing liquid, so as to flush the root canal. The light transmission piece in the root canal flushing hand tool can form a solid-liquid interface with the flushing liquid in the target liquid domain through the second surface, so that the laser beam is transmitted into the flushing liquid in the target liquid domain through the light guide channel in the light transmission piece and the solid-liquid interface, and a focal point is formed in the flushing liquid in the target liquid domain. In this way, the transmission path of the laser beam does not need to pass through the gas-liquid interface between air and the flushing liquid, so that the influence of liquid surface fluctuation of the flushing liquid on the position of the focal point can be reduced, the stability of the laser light path is improved, and then the laser can more stably produce a photo-induced breakdown effect on the flushing liquid to form a cavitation bubble, and the root canal cleaning effect is improved. In addition, since the stability of the laser light path is improved, after the flushing liquid is broken down by the laser beam to form a cavitation bubble, the laser beam can be output again to break down the flushing liquid again, so that a higher laser working frequency can be supported, the generation efficiency of the cavitation bubble is improved, and the root canal cleaning effect is further improved.

[0096] It can be understood that the cost of the gemstone working tip in the related art is high. When the gemstone working tip is damaged during clinical use, the cost of the root canal flushing hand tool is greatly increased. In the embodiments of the present application, the focusing is not performed through the gemstone working tip, so that the use cost of the root canal flushing hand tool can be reduced.

[0097] In some embodiments, the light transmission piece 130 is internally formed with a cavity. The second surface comprises a top wall of the cavity. The cavity is used to form a liquid domain communicated with the pulp cavity. The target liquid domain comprises the liquid domain formed in the cavity.

[0098] Here, the top wall of the cavity forms a solid-liquid interface with the flushing liquid of the liquid domain communicated with the pulp cavity formed in the cavity. The focal point is formed in the cavity from the liquid domain.

[0099] During the working process of the light transmission piece 130, the cavity is continuously injected with the root canal flushing liquid.

[0100] The light guide channel and the liquid domain communicated with the pulp cavity formed in the cavity are independent of each other.

[0101] For example, such as Figure 5 As shown, the optical path transmission structure 120 may include a focusing structure 50; a cavity is formed inside the light-transmitting element 130, and a liquid domain 54 communicating with the pulp cavity is formed in the cavity; the first surface of the light-transmitting element 130 is surface 51, and the second surface of the light-transmitting element 130 is the top wall surface 52 of the cavity; the area between surface 51 and surface 52 may correspond to a light-guiding channel 53; surface 52 and the rinsing fluid in the liquid domain 54 form a solid-liquid interface; the liquid domain 54 may correspond to the aforementioned target liquid domain;

[0102] The laser beam passes through the focusing structure 50 and exits. Through the light guide channel 53, it passes through the light guide surface 51 and is further focused in the liquid domain 54 to form a focal point 55. The rinsing fluid at the focal point 55 is broken down by the laser energy, producing a photo-induced breakdown effect, inducing plasma cavitation to activate the rinsing fluid, and rinsing the root canal. The generation, expansion, oscillation and quenching of cavitation bubbles are completed in the liquid domain 54 formed in the cavity.

[0103] For example, such as Figure 6 As shown, the light-transmitting element 130 may include a liquid injection port 61 and has a cavity formed inside it. A liquid domain 62 communicating with the pulp cavity is formed in the cavity. The first surface of the light-transmitting element 130 is surface 63, and the second surface of the light-transmitting element 130 is surface 64. A light guiding channel 65 is formed between surface 63 and surface 64. The liquid domain 62 may correspond to the aforementioned target liquid domain.

[0104] The laser beam passes through the focusing structure 66, through the light guide channel 65 via the transmission surface 63, and further through the transmission surface 64 to focus in the liquid domain 62 to form a focal point 67. The rinsing fluid at the focal point 67 is broken down by the laser energy, producing a photo-induced breakdown effect, inducing plasma cavitation to activate the rinsing fluid, and rinsing the root canal.

[0105] Understandably, the pulp chamber can be approximated as a three-dimensional cavity. For example, the maximum length of this three-dimensional cavity is approximately 3 to 4 millimeters, the maximum width is approximately 4 to 5 millimeters, and the maximum height is approximately 4 to 5 millimeters. Under this cavity structure, it is difficult for the pulp chamber to accommodate the generation, expansion, oscillation, and quenching of cavitation bubbles with a diameter of 6 millimeters or larger. Therefore, the cavitation bubbles generated within the pulp chamber are subject to boundary constraints, resulting in limited cavitation effectiveness and consequently limiting the cleaning effect of the root canal.

[0106] In this case, a cavity is formed within the light-transmitting element, and the size of the cavity is not limited by the size of the pulp cavity. Therefore, the aforementioned limitations on cavitation can be reduced by setting the cavity size to be larger than the pulp cavity size and completing the cavitation effect within the cavity. For example, the cavity can be set as a three-dimensional structure with each side length greater than 10 mm, thereby enabling the cavity to accommodate cavitation bubbles with a diameter of 10 mm.

[0107] In this embodiment, a cavity is formed inside the light-transmitting element, and the second surface includes the top wall of the cavity. The cavity is used to form a liquid domain communicating with the pulp cavity, and the target liquid domain includes the liquid domain formed in the cavity. In this way, on the one hand, the pressure of cavitation on the root canal can be reduced and damage to the root canal can be reduced by realizing the generation, expansion, oscillation and quenching of cavitation bubbles in the cavity; on the other hand, the application of the cavity can better control the generation boundary of cavitation bubbles, provide a space to accommodate larger cavitation bubbles, so that their size is not limited by the pulp cavity space. Thus, by increasing the size of the cavitation bubbles, the intensity of the high-speed microjets generated in the activation liquid is greater, and the cleaning effect is better.

[0108] In some embodiments, the bottom wall and / or side wall of the cavity has at least one opening for connecting the cavity and the pulp chamber. When the irrigating fluid in the cavity is activated, it forms a jet flowing into the pulp chamber through the at least one opening to irrigate the root canal.

[0109] Here, by setting openings in different directions and numbers on the bottom wall and / or side wall of the cavity, different cleaning effects can be achieved in different cleaning scenarios.

[0110] For example, such as Figure 7 As shown, an opening 71 can be provided on the bottom wall of the cavity 70 of the light-transmitting element 130. After the rinsing fluid in the liquid domain formed in the cavity 70 is activated, the resulting jet is ejected through the opening 71 to the bottom of the light-transmitting element 130 and flows into the pulp cavity.

[0111] For example, such as Figure 8 As shown, two openings 81 and 82 can be provided on the side wall of the cavity 80 of the light-transmitting element 130 near the bottom. After the rinsing fluid in the liquid domain formed in the cavity 80 is activated, the resulting jet is ejected through the openings 81 and 82 to the oblique side of the bottom of the light-transmitting element 130 and flows into the pulp cavity.

[0112] For example, such as Figure 9 As shown, an opening 91 can be provided on the side wall of the cavity 90 of the light-transmitting element 130. After the rinsing fluid in the liquid domain formed in the cavity 90 is activated, the resulting jet is ejected through the opening 91 to the side of the light-transmitting element 130 and flows into the pulp cavity.

[0113] In some embodiments, multiple openings can be provided on the side wall of the cavity 90 so that the jet generated after the flushing fluid in the cavity 90 is activated is divided into multiple streams and simultaneously ejected from the light-transmitting element.

[0114] Understandably, each opening corresponds to a different cleaning position. By increasing the number of openings, the overall cleaning efficiency can be improved by increasing the number of pulp chamber positions that can be cleaned simultaneously, and the cleaning position can be flexibly adjusted.

[0115] In the embodiments of the present application, the bottom wall and / or the side wall of the cavity has at least one opening for connecting the cavity and the pulp cavity, and the jet flow formed by the activated irrigation liquid in the cavity through the at least one opening can be used to irrigate the root canal. In this way, the light-transmitting piece with different jet openings can be selected according to different cleaning requirements to effectively control and protect the apical pressure. For example, the light-transmitting piece with an opening in the bottom wall of the cavity can be used to make the jet flow of the activated irrigation liquid shoot from the bottom of the light-transmitting piece, thereby improving the cleaning effect on the apex; for another example, the light-transmitting piece with an opening in the side wall of the cavity can be used to make the jet flow of the activated irrigation liquid shoot from the side wall of the light-transmitting piece, thereby improving the cleaning effect on the side wall of the pulp cavity and reducing the direct impact on the apex; for another example, the light-transmitting piece with one opening can be used to make the jet flow of the activated irrigation liquid shoot from the one opening, thereby improving the cleaning effect on a single position; for another example, the light-transmitting piece with multiple openings can be used to make the jet flow of the activated irrigation liquid shoot from the multiple openings at the same time, thereby cleaning multiple positions in the pulp cavity at the same time and improving the overall cleaning efficiency.

[0116] In some embodiments, the side of the cavity away from the top wall has a first cross section, and the side of the cavity close to the top wall has a second cross section, and the area of the first cross section is smaller than the area of the second cross section.

[0117] It can be understood that the first cross section is the cross-sectional area of the cavity on the side away from the top wall, excluding the area of the external structure of the cavity.

[0118] The second cross section is the cross-sectional area of the cavity on the side close to the top wall, excluding the area of the external structure of the cavity.

[0119] In some embodiments, the cross-sectional areas of the side close to the top wall and the side away from the top wall of the light-transmitting piece can be the same or different, and the embodiments of the present application are not limited in this regard.

[0120] For example, Figure 7 The side of the cavity 70 of the light-transmitting piece 130 close to the top wall 72 can be a cylindrical structure, and the cross section 73 can correspond to the second cross section; the side of the cavity 70 of the light-transmitting piece 130 away from the top wall 72 can be a cylindrical structure, and the cross section 74 can correspond to the first cross section; and the area of the first cross section is smaller than the area of the second cross section.

[0121] The focus point is formed in the irrigation liquid in the cavity 70, the irrigation liquid in the cavity 70 is broken by the laser energy, and the photo-induced breakdown effect, induced plasma cavitation, and the like are generated to activate the irrigation liquid to form a jet flow; and the jet flow is shot from the opening 71.

[0122] In some embodiments, the cavity can be conical, the side of the cavity away from the top wall can be the small end of the conical shape, and the side of the cavity close to the top wall can be the large end of the conical shape.

[0123] Exemplarily, referring to the light-transmitting piece 130 in Figure 6 The light-transmitting piece 130 is tapered at a large end close to one side of the top wall formed by the face 63 and the face 64, and is tapered at a small end away from the other side of the top wall.

[0124] In the embodiments of the present application, the cavity has a first cross section away from the top wall, and has a second cross section close to the top wall, and the area of the first cross section is smaller than the area of the second cross section. In this way, by controlling the cross section area of the cavity to be narrowed away from the top wall and close to the pulp cavity, the pressure of the jet flow generated after the activation of the flushing liquid in the cavity can be increased, so that the flow rate is increased and the impact force is greater, and the cleaning effect on the root canal is better.

[0125] In some embodiments, the cavity has at least one flow guide channel away from the top wall, and the flow guide channel connects the cavity and at least one opening.

[0126] Here, the jet flow generated after the activation of the flushing liquid enters the flow guide channel from the cavity, and is emitted from the at least one opening.

[0127] In some embodiments, the flow guide channel can include a tubular structure and / or a non-tubular structure. The tubular structure can include a tubular channel, and the non-tubular structure can include, but is not limited to, a conical structure, a pyramidal structure, a three-dimensional structure with a gradient, etc.

[0128] Exemplarily, at least one tubular channel can be provided at the bottom of the cavity of the light-transmitting piece 130, and the jet flow generated after the activation of the flushing liquid in the cavity flows to each opening corresponding to the tubular channel through the at least one tubular channel and is emitted, and flows to the pulp cavity.

[0129] Exemplarily, as shown in Figure 10 Two openings 102 and 103 can be provided at the bottom side wall of the cavity 101 of the light-transmitting piece 130, and the jet flow generated after the activation of the flushing liquid in the cavity 101 is guided by the conical structure 104 provided at the bottom wall of the cavity 101, and is emitted to the inclined side of the bottom of the light-transmitting piece 130 through the openings 102 and 103, and flows to the pulp cavity.

[0130] In the embodiments of the present application, the cavity has at least one flow guide channel away from the top wall, and the flow guide channel connects the cavity and at least one opening. In this way, the flow direction and flow speed of the jet flow generated after the activation of the flushing liquid can be controlled through the flow guide channel, and the cleaning effect is further improved.

[0131] In some embodiments, the long axis of the handpiece body 110 extends in a first direction;

[0132] The light path transmission structure 120 is configured to output the received laser beam along a first direction, the first surface intersects the first direction, and the flow direction of the jet intersects the first direction; or

[0133] The light path transmission structure 120 is configured to output the received laser beam along a second direction, the first surface intersects the second direction, and the flow direction of the jet is the same as the second direction, and the second direction is perpendicular to the first direction.

[0134] Here, the laser beam can be output in the first direction in the light path transmission structure 120, pass through the first surface into the cavity of the light-transmitting piece 130, and form a focal point in the flushing liquid in the cavity. The flow direction of the generated jet is intersected with the first direction through the opening of the light-transmitting piece 130, so that the light path transmission direction is different from the jet direction.

[0135] Exemplarily, as shown in Figure 11 The top surface of one end of the light path transmission structure 120 is connected with the side wall of the top end of the side of the light-transmitting piece 130 away from the dental pulp cavity, the long axis of the hand tool body extends along the direction 111, the direction 111 can correspond to the first direction described above, and the cavity of the light-transmitting piece 130 has a liquid domain 112 formed by the flushing liquid and communicating with the dental pulp cavity;

[0136] The laser beam passes through the focusing structure 113 from the light path transmission structure 120 in the hand tool body along the direction 111, focuses in the liquid domain 112, and forms a focal point 116. The flushing liquid at the focal point 116 is broken by the laser energy, generates a photo-induced breakdown effect, induces plasma cavitation to activate the flushing liquid, and generates a jet. The jet is emitted from the opening 114 of the light-transmitting piece 130 communicating with the dental pulp cavity, and flows into the dental pulp cavity. At this time, the flow direction 115 of the jet intersects the direction 111.

[0137] Exemplarily, as shown in Figure 12 The side wall of one end of the light path transmission structure 120 is connected with the top surface of the top end of the side of the light-transmitting piece 130 away from the dental pulp cavity, the light path transmission structure 120 is internally provided with a reflection structure 121, the light path transmission structure 120 is provided with a focusing structure 122 at the connection with the light-transmitting piece 130, the long axis of the hand tool body extends along the direction 123, the direction 123 can correspond to the first direction described above, and the cavity of the light-transmitting piece 130 has a liquid domain 124 formed by the flushing liquid and communicating with the dental pulp cavity;

[0138] The laser beam is transmitted from the light path transmission structure 120 in the hand tool body along direction 123 to the reflection structure 121, changes the propagation direction, and then passes through the focusing structure 122 along direction 125 to focus on the liquid domain 124 to form a focal point 128. The flushing liquid at the focal point 128 is broken by the laser energy to generate a photodisruption effect, induce plasma cavitation to activate the flushing liquid, and generate a jet. The jet is emitted from the opening 126 of the light-transmitting piece 130 in communication with the dental pulp cavity and flows to the dental pulp cavity; direction 125 can correspond to the second direction described above. At this time, the flow direction 127 of the jet is the same as direction 125 and perpendicular to direction 123.

[0139] In the embodiments of the present application, the long axis of the hand tool body extends along the first direction; the light path transmission structure is configured to output the received laser beam along the first direction, the first surface intersects the first direction, and the flow direction of the jet intersects the first direction; or the light path transmission structure is configured to output the received laser beam along the second direction, the first surface intersects the second direction, and the flow direction of the jet is the same as the second direction, and the second direction is perpendicular to the first direction. In this way, the direction in which the light path transmission structure outputs the laser beam can be the same as or different from the flow direction of the jet. In the case where the direction in which the light path transmission structure outputs the laser beam is different from the flow direction of the jet, the jet direction is not limited to the direction in which the long axis of the hand tool body extends, and the jet direction intersects or is perpendicular to the direction in which the long axis of the hand tool body extends. Therefore, the jet direction can be changed to intersect or be perpendicular to the plane in which the long axis of the hand tool body extends, so that the root canal at more positions inside the oral cavity can be cleaned when the hand tool body is inserted into the oral cavity, the flexibility of clinical operation is improved, and the positions of the teeth that can be cleaned are increased.

[0140] In some embodiments, the target liquid domain further includes a liquid domain formed in the dental pulp cavity.

[0141] Here, the focal point can be formed in the liquid domain formed in the dental pulp cavity, and the cavity of the light-transmitting piece forms a liquid domain in communication with the dental pulp cavity, and the liquid level is higher than that of the liquid domain in the dental pulp cavity.

[0142] For example, as shown in Figure 13 The focusing structure 131 can be a focusing convex lens; the first surface of the light-transmitting piece 130 is surface 132, the second surface of the light-transmitting piece 130 is surface 133, a light guide channel 134 is formed between surface 132 and surface 133, the cavity of the light-transmitting piece 130 forms a liquid domain 135 in communication with the dental pulp cavity, surface 133 forms a solid-liquid interface with the flushing liquid in the liquid domain 135, and a liquid domain 137 is formed in the dental pulp cavity; the light-transmitting piece 130 can further include a liquid injection port 136 for externally injecting flushing liquid to form the liquid domain 135 and the liquid domain 137; the liquid domain 135 and the liquid domain 137 can correspond to the target liquid domain described above;

[0143] The laser beam passes through the focusing structure 131 and goes out, passes through the light guide channel 134 through the surface 132, further passes through the solid-liquid interface formed by the surface 133 and the flushing liquid in the liquid domain 135, and focuses on the liquid domain 137 to form a focal point 138; the flushing liquid at the focal point 138 is broken by the laser energy to produce a photo-induced breakdown effect, induce plasma cavitation to activate the flushing liquid, and flush the root canal.

[0144] In the embodiments of the present application, the target liquid domain can also include a liquid domain formed in the pulp cavity. In this way, the focal point can be formed in the pulp cavity and cavitation can be performed in the pulp cavity. Since there is a liquid domain in the pulp cavity in communication with the light-transmitting member, the liquid level of the flushing liquid subjected to cavitation is higher than the liquid level of the liquid domain formed in the pulp cavity, which can reduce the constraint on the boundary of the cavitation bubble, increase the volume of the cavitation bubble, and thus improve the cleaning effect.

[0145] In some embodiments, the second surface includes a bottom surface of the light-transmitting member, and the target liquid domain includes a liquid domain formed in the pulp cavity.

[0146] Here, the surface of the light-transmitting member in contact with the liquid domain formed in the pulp cavity is closed. The light-transmitting member can include a cavity structure or be a solid light-transmitting medium; wherein the cavity structure of the light-transmitting member can be a hollow structure or a non-hollow structure with a filler.

[0147] The bottom surface of the light-transmitting member forms a solid-liquid interface with the flushing liquid in the liquid domain formed in the pulp cavity, and focuses on the liquid domain formed in the pulp cavity to form a focal point, and a photo-induced breakdown effect is produced in the flushing liquid in the liquid domain formed in the pulp cavity to induce plasma cavitation to activate the flushing liquid and flush the root canal;

[0148] The light-transmitting member is used to transmit the light of the laser beam and push away the liquid above the focal point.

[0149] Exemplarily, the root canal flushing hand tool with the above structure can refer to Figure 4 .

[0150] In the embodiments of the present application, the second surface includes a bottom surface of the light-transmitting member, and the target liquid domain includes a liquid domain formed in the pulp cavity. In this way, the transmission path of the laser beam does not need to pass through the gas-liquid interface between the air and the flushing liquid, so that the influence of the liquid surface fluctuation of the flushing liquid on the focal point position can be reduced, the stability of the laser beam path is improved, and the laser beam can more stably produce a photo-induced breakdown effect on the flushing liquid to form a cavitation bubble, thereby improving the root canal cleaning effect. In addition, since the stability of the laser beam path is improved, after the laser beam breaks the flushing liquid to form a cavitation bubble, the laser beam can be output again without waiting for the liquid surface to be calm, so as to perform the next breakdown on the flushing liquid. In this way, a higher laser working frequency can be supported, the generation efficiency of the cavitation bubble is improved, and the root canal cleaning effect is further improved.

[0151] In some embodiments, the long axis of the hand body extends along a first direction;

[0152] The optical transmission structure includes a first optical reflection structure, which reflects the received laser beam along a first direction to an output along a third direction. The laser beam output along the third direction is then transmitted to the light guide channel through a first surface; or,

[0153] The light guide channel includes a second optical reflection structure, which is used to reflect the laser beam output from the optical path transmission structure along the first direction to the third direction. The laser beam output along the third direction is transmitted to the rinsing liquid in the target liquid domain through the solid-liquid interface.

[0154] Among them, the third direction is perpendicular to the first direction.

[0155] Here, the optical reflection structure may include a structure capable of reflecting light to change the transmission direction of the laser beam projected onto the optical reflection structure. For example, the optical reflection structure may include, but is not limited to, at least one of a plane mirror, a curved mirror, a reflective coating, a light reflection device, etc.

[0156] In some implementations, the laser beam can change its propagation direction through an optical reflection structure, and then be focused by a focusing structure to form an optical focal point.

[0157] In some embodiments, the first light-reflecting structure may be disposed at at least one of the following positions: the end of the light transmission structure near the light-transmitting element, the end of the light transmission structure away from the light-transmitting element, or the middle section of the light transmission structure.

[0158] For example, Figure 12 The reflection structure 121 in the above-mentioned first optical reflection structure can correspond to the reflection structure 121 in the above-mentioned first optical reflection structure.

[0159] In some embodiments, the second light-reflecting structure may be disposed at at least one of the following positions: one end of the light guide channel near the first surface, one end of the light guide channel near the second surface, or the middle section of the light guide channel.

[0160] In the embodiments of the present application, the long axis of the hand tool body extends along the first direction; the light path transmission structure comprises a first optical reflection structure, the first optical reflection structure is used for reflecting the received laser beam along the first direction to output along the third direction, and the laser beam output along the third direction is transmitted to the light guide channel through the first surface; or, the light guide channel comprises a second optical reflection structure, the second optical reflection structure is used for reflecting the laser beam along the first direction output by the light path transmission structure to output along the third direction, and the laser beam output along the third direction is transmitted to the flushing liquid in the target liquid domain through the solid-liquid interface; wherein, the third direction is perpendicular to the first direction. In this way, on the one hand, the optical reflection structure in the light path transmission structure or the light guide channel can be used to reflect the laser beam, so that the transmission direction of the laser beam changes, which is not limited to the extension direction of the long axis of the working hand tool, and the position of the flushable tooth can be increased by changing the light path direction; on the other hand, the change of the transmission direction of the laser beam can be realized through the optical reflection structure of different components in the root canal flushing hand tool, and the scheme is more flexible and easy to popularize.

[0161] In some embodiments, the first optical reflection structure comprises a first reflection focusing structure, the first reflection focusing structure is used for reflecting and focusing the received laser beam along the first direction, so that the laser beam is focused to the flushing liquid in the target liquid domain along the third direction through the light guide channel and the solid-liquid interface; or,

[0162] The second optical reflection structure comprises a second reflection focusing structure, the second reflection focusing structure is used for reflecting and focusing the laser beam along the first direction output by the light path transmission structure, so that the laser beam is focused to the flushing liquid in the target liquid domain along the third direction through the solid-liquid interface.

[0163] Here, the reflection focusing structure can include a structure that can reflect light and form optical focusing, for example, can include but is not limited to at least one of a concave mirror, a curved mirror, a light reflection focusing device, etc.

[0164] In some embodiments, the laser beam can change the propagation direction through the reflection focusing structure and form an optical focus point.

[0165] In some embodiments, the light path transmission structure or the light-transmitting piece comprises a concave mirror, the concave mirror is used for changing the transmission direction of the laser beam projected to the concave mirror.

[0166] Exemplarily, as shown in Figure 14 the side wall of one end of the light path transmission structure 120 is connected with the top surface of the top end of the side of the light-transmitting piece 130 away from the dental pulp cavity, the light path transmission structure 120 is internally provided with a concave mirror 141, the long axis of the hand tool body extends along the direction 142, the direction 142 can correspond to the above-mentioned first direction, and the liquid domain 143 is formed in the dental pulp cavity; the liquid domain 143 can correspond to the above-mentioned target liquid domain;

[0167] The laser beam is projected from the light path transmission structure 120 in the hand tool body along direction 142 to the concave mirror 141, focused after changing the propagation direction by reflection, passes through the first surface 144 of the light-transmitting piece 130, exits from the second surface 145 of the light-transmitting piece 130 along the light guide channel 146, and is focused in the liquid domain 143 to form a focal point 148. The flushing liquid at the focal point 148 is broken by the laser energy to produce a photo-induced breakdown effect, induce plasma cavitation to activate the flushing liquid, and direction 147 can correspond to the third direction described above. At this time, direction 147 is perpendicular to direction 142.

[0168] The surface of the light-transmitting piece in contact with the liquid domain 143 formed in the dental pulp cavity is closed, and the light-transmitting piece can include a cavity structure or be a solid light guide medium.

[0169] In some embodiments, a cavity is formed inside the light-transmitting piece, the second surface includes the top wall of the cavity, the cavity is used to form a liquid domain in communication with the dental pulp cavity, and the target liquid domain includes the liquid domain formed in the cavity and / or the liquid domain in communication with the dental pulp cavity.

[0170] For example, as shown in Figure 15 The side wall of one end of the light path transmission structure 120 is connected to the top surface of the top end of the side of the light-transmitting piece 130 away from the dental pulp cavity, a concave mirror 151 is arranged inside the light path transmission structure 120, the long axis of the hand tool body extends along direction 152, direction 152 can correspond to the first direction described above, a liquid domain 153 is formed in the dental pulp cavity, and a liquid domain 154 in communication with the dental pulp cavity is formed by the flushing liquid in the cavity of the light-transmitting piece 130; the liquid domain 154 can correspond to the target liquid domain described above.

[0171] The laser beam is projected from the light path transmission structure 120 in the hand tool body along direction 152 to the concave mirror 151, focused after changing the propagation direction by reflection, passes through the first surface 155 of the light-transmitting piece 130, exits from the second surface 156 of the light-transmitting piece 130 along channel 157, and is focused in the liquid domain 154 to form a focal point 150. The flushing liquid at the focal point 150 is broken by the laser energy to produce a photo-induced breakdown effect, induce plasma cavitation to activate the flushing liquid, produce a jet, and the jet exits from the opening 158 of the light-transmitting piece 130 in communication with the dental pulp cavity and flows to the dental pulp cavity; the flow direction 159 of the jet can correspond to the third direction described above. At this time, the flow direction 159 of the jet is perpendicular to direction 152.

[0172] For example, as shown in Figure 16As shown, the side wall of one end of the light path transmission structure 120 is connected with the top surface of the top end of the side of the light-transmitting piece 130 away from the dental pulp cavity, the light path transmission structure 120 is internally provided with a concave mirror 161, the long axis of the hand tool body extends along a direction 162, the direction 162 can correspond to the first direction mentioned above, a liquid domain 163 is formed in the dental pulp cavity, and a liquid domain 164 in communication with the dental pulp cavity is formed by the flushing liquid in the cavity of the light-transmitting piece 130; the liquid domain 163 and the liquid domain 164 can correspond to the target liquid domain mentioned above;

[0173] The laser beam is projected from the light path transmission structure 120 in the hand tool body to the concave mirror 161 along the direction 162, is focused after changing the propagation direction by reflection, passes through the first surface 165 of the light-transmitting piece 130, and is emitted from the second surface 166 of the light-transmitting piece 130 along the channel 167, is focused in the liquid domain 163, and forms a focal point 169, the flushing liquid at the focal point 169 is broken by the laser energy, generates a photo-induced breakdown effect, induces plasma cavitation to activate the flushing liquid, and performs root canal irrigation, the direction 168 can correspond to the third direction mentioned above, and the direction 168 is perpendicular to the direction 162.

[0174] In the embodiments of the present application, the first optical reflection structure includes a first reflection focusing structure, the first reflection focusing structure is used for reflecting and focusing the received laser beam along the first direction, so that the laser beam is focused into the flushing liquid in the target liquid domain along the third direction via the light guide channel and the solid-liquid interface; or, the second optical reflection structure includes a second reflection focusing structure, the second reflection focusing structure is used for reflecting and focusing the laser beam along the first direction output by the light path transmission structure, so that the laser beam is focused into the flushing liquid in the target liquid domain along the third direction via the solid-liquid interface. In this way, the reflection and focusing of the laser beam can be simultaneously completed by using the reflection and focusing integrated structure in the root canal irrigation hand tool, the reflection and focusing structure of the root canal irrigation hand tool capable of cleaning more positions of the tooth is further simplified, and the root canal irrigation hand tool is easy to popularize.

[0175] In some embodiments, the light path transmission structure includes a first optical focusing structure, the first optical focusing structure is used for focusing the received laser beam, so that the laser beam is focused into the flushing liquid in the target liquid domain via the light guide channel and the solid-liquid interface; or,

[0176] The light guide channel is provided with a second optical focusing structure, the second optical focusing structure is used for focusing the laser beam output by the light path transmission structure, so that the laser beam is focused into the flushing liquid in the target liquid domain via the solid-liquid interface.

[0177] Here, the optical focusing structure can include a structure capable of focusing light, and is used for focusing the received laser beam and forming a focal point. For example, the optical focusing structure can include but is not limited to at least one of a lens, a reflection type light condensing device, a projection type light condensing device, etc.

[0178] For example, Figure 12 The focusing structure 122 in the above can correspond to the first optical focusing structure.

[0179] For example, such as Figure 17 As shown, one sidewall of the optical transmission structure 120 is connected to the top surface of the top of the light-transmitting element 130 on the side away from the pulp cavity. A reflection structure 171 is provided inside the optical transmission structure 120. A focusing structure 172 is provided at the connection between the optical transmission structure 120 and the light-transmitting element 130. The long axis of the handpiece body extends along direction 173, which can correspond to the first direction mentioned above. A liquid domain 174 communicating with the pulp cavity is formed in the cavity of the light-transmitting element 130 by the rinsing fluid. A liquid domain 175 is formed in the pulp cavity. Liquid domains 174 and 175 can correspond to the target liquid domain mentioned above.

[0180] The laser beam travels from the optical path transmission structure 120 within the handpiece body along direction 173 to the reflecting structure 171. After changing its propagation direction, it passes through the focusing structure 172 along direction 176 and focuses within the liquid domain 175, forming a focal point 177. The rinsing fluid at the focal point 177 is broken down by the laser energy, generating a photo-induced breakdown effect and inducing plasma cavitation to activate the rinsing fluid, thus rinsing the root canal. Direction 176 corresponds to the aforementioned third direction and is perpendicular to direction 173. In this way, the focal point can be formed within the pulp cavity, where cavitation occurs. Due to the presence of a liquid domain connected to the pulp cavity by the light-transmitting element, the level of the rinsing fluid undergoing cavitation is higher than the level of the liquid domain formed within the pulp cavity. This reduces the constraint on the cavitation bubble boundary, increases the cavitation bubble volume, and thus improves the cleaning effect.

[0181] For example, such as Figure 18 As shown, the sidewall of one end of the optical path transmission structure 120 is connected to the top surface of the top of the light-transmitting element 130 on the side away from the pulp cavity. A reflection structure 181 is provided inside the optical path transmission structure 120. A focusing structure 182 is provided at the connection between the optical path transmission structure 120 and the light-transmitting element 130. The long axis of the hand tool body 110 extends along direction 183, which can correspond to the first direction mentioned above. A liquid domain 184 is formed inside the pulp cavity. The liquid domain 184 can correspond to the target liquid domain mentioned above.

[0182] The laser beam reaches the reflecting structure 181 from the light path transmission structure 120 in the hand tool body along a direction 183, changes the propagation direction, and then passes through the focusing structure 182 along a direction 185 to focus on the liquid domain 184 to form a focal point 186. The flushing liquid at the focal point 186 is broken by the laser energy to produce a photo-induced breakdown effect, induce plasma cavitation to activate the flushing liquid, and flush the root canal. The direction 185 can correspond to the third direction mentioned above, and the direction 185 is perpendicular to the direction 183.

[0183] The surface of the light-transmitting part in contact with the liquid domain 184 formed in the pulp cavity is closed. The light-transmitting part can include a cavity structure or be a solid light-transmitting medium.

[0184] In some embodiments, the light path transmission structure can include an optical reflecting structure, and the light-transmitting part is provided with an optical focusing structure.

[0185] For example, a convex lens can be arranged in the light guide channel as the second optical focusing structure.

[0186] For another example, the first surface and the second surface of the light-transmitting part 130 can be both arranged as convex surfaces, so that the light-transmitting part 130 itself forms an optical focusing structure.

[0187] In the embodiments of the present application, the light path transmission structure includes a first optical focusing structure, which is used to focus the received laser beam to make the laser beam focus on the flushing liquid in the target liquid domain through the light guide channel and the solid-liquid interface. Alternatively, the light guide channel is provided with a second optical focusing structure, which is used to focus the laser beam output by the light path transmission structure to make the laser beam focus on the flushing liquid in the target liquid domain through the solid-liquid interface. In this way, the focusing of the laser beam can be realized through the optical focusing structures of different components in the root canal flushing hand tool, the position of the focusing structure is not limited, and the implementation of the scheme is more flexible and easy to promote.

[0188] In some embodiments, the light-transmitting part has a support structure for supporting the light-transmitting part to support the light-transmitting part at the opening of the pulp cavity; and / or,

[0189] The bottom of the light-transmitting part is in a tapered narrowing structure for supporting the light-transmitting part to support the light-transmitting part at the opening of the pulp cavity.

[0190] Here, the support structure can include a positioning clasp, wherein the clasp can be annular or partially annular, or can be circular arc-shaped, planar, conical or other shapes.

[0191] In some embodiments, a positioning clasp is arranged at one end of the light-transmitting piece close to the dental pulp cavity, which is used to support the light-transmitting piece to be placed on the dental crown corresponding to the dental pulp cavity, so that the light-transmitting piece forms a solid-liquid interface with the flushing liquid in the target liquid domain corresponding to the dental pulp cavity with the second surface.

[0192] As shown in the example, Figure 19 The clasp 191 is arranged at the opening 193 of the light-transmitting piece 130 close to the dental pulp cavity 192, supporting the light-transmitting piece 130 to be placed on the dental crown 194 corresponding to the dental pulp cavity 192.

[0193] The light-transmitting piece 130 can include a cavity structure or be a solid light-transmitting medium.

[0194] In some embodiments, the tapered narrowing structure can include, but is not limited to, one of a conical narrowing, a pyramidal narrowing, etc.

[0195] As shown in the example, Figure 20 The light-transmitting piece 130 has a taper at the end in contact with the opening of the dental pulp cavity 201, so that the light-transmitting piece 130 is embedded in the opening of the dental pulp cavity 201.

[0196] The light-transmitting piece 130 can include a cavity structure or be a solid light-transmitting medium.

[0197] In the embodiments of the present application, the light-transmitting piece has a supporting structure for supporting the light-transmitting piece, so that the light-transmitting piece is supported at the opening of the dental pulp cavity; and / or the bottom of the light-transmitting piece is in a tapered narrowing structure for supporting the light-transmitting piece, so that the light-transmitting piece is supported at the opening of the dental pulp cavity. In this way, on the one hand, the light-transmitting piece itself has a supporting function, which can improve the problem of unstable position of the focusing point caused by unstable position of the light-transmitting piece during use; on the other hand, the bottom of the light-transmitting piece is arranged in a tapered narrowing structure, without the need to increase an additional supporting structure, so that the light-transmitting piece can play a positioning role while reducing the structural complexity of the light-transmitting piece.

[0198] On this basis, the embodiments of the present application provide a root canal flushing hand tool, which can improve the problem of unstable optical focusing point of the root canal flushing hand tool using the LIPA method during use, leading to poor cleaning effect, as shown in the example, Figure 21 The root canal flushing hand tool 210 includes a hand tool body 211, a light path transmission structure 212, and a light-transmitting piece 213.

[0199] The hand tool body 211 can be composed of the light path transmission structure 212, an interface connected with a light guide arm of a laser emitting device, and a detachable hand tool shell.

[0200] The light path transmission structure 212 is arranged inside the hand tool body 211, and can include an optical reflection focusing structure, which can correspond to the first reflection focusing structure described above. The light path transmission structure 212 is connected to the light transmission piece 213 at an end away from the light guide arm.

[0201] The light transmission piece 213 is arranged at an end of the hand tool body 211 away from the light guide arm. The light transmission piece 213 has a light guide channel between a first surface and a second surface. The light path transmission structure 212 is optically connected to the light guide channel through the first surface.

[0202] The light transmission piece 213 is configured to form a solid-liquid interface with the irrigation liquid in the target liquid domain through the second surface. The target liquid domain includes at least one of: a liquid domain formed in the dental pulp cavity, a liquid domain in communication with the dental pulp cavity.

[0203] The light path transmission structure 212 is configured to transmit the received laser beam to the irrigation liquid in the target liquid domain through the light guide channel and the solid-liquid interface, form a focal point in the irrigation liquid in the target liquid domain, and use the laser energy to generate a photo-induced breakdown effect in the irrigation liquid, induce plasma cavitation to activate the irrigation liquid, and perform root canal irrigation.

[0204] In some embodiments, the interface between the hand tool body 211 and the light guide arm of the laser emitting device can be a general light guide arm threaded connection interface. In this way, on the one hand, the hand tool body 211 can be adapted to a general light guide arm; on the other hand, the threaded connection can make the connection between the hand tool body 211 and the light guide arm more secure.

[0205] In some embodiments, the light path transmission structure 212 can include an optical reflection structure and an optical focusing structure, which can correspond to the first optical reflection structure and the first optical focusing structure in the above embodiments, respectively.

[0206] In some embodiments, the light path transmission structure 212 can include an optical reflection focusing structure, which can correspond to the first reflection focusing structure in the above embodiments.

[0207] In some embodiments, the hand tool shell described above can include a liquid injection port and a flow guide channel. The liquid injection port is configured to inject root canal irrigation liquid from the outside so that the dental pulp cavity is always filled with liquid. The flow guide channel is configured to guide the root canal irrigation liquid from the liquid injection port to the dental pulp cavity.

[0208] In some embodiments, the light transmission piece 213 has a cavity formed therein, which is in communication with the dental pulp cavity. The cavity has a liquid domain formed therein.

[0209] In some embodiments, the liquid injection control of the liquid injection port and the control of the light emitting of the laser generating device through the light guide arm can be realized by a foot switch. In this way, the hands can be conveniently controlled for other operations, and the portability and synchronization of the operation can be improved.

[0210] In some embodiments, the light transmission member 213 can be provided with a positioning protective shell; the positioning protective shell can correspond to the support structure in the above-mentioned embodiments.

[0211] Exemplarily, in implementation, the spot size of the light guide arm can be 6-8 mm, the focus point size can be 50 microns, and the wavelength of the laser beam can be 1064 nm.

[0212] Exemplarily, as shown in Figure 22 The root canal flushing hand tool 220 includes a hand tool body 221, a light path transmission structure 222, and a light transmission member 223.

[0213] The hand tool body 221 can be composed of the light path transmission structure 222, an interface 2211 connected with the light guide arm 224 of the laser emitting device, and a detachable hand tool shell 2212, which includes a liquid injection port 22121 and an internal flow guide channel 22122.

[0214] The light path transmission structure 222 can include a plane mirror 2221 with high reflectivity and a convex lens 2222 for focusing, and the plane mirror 2221 and the convex lens 2222 can correspond to the first optical reflection structure and the first optical focusing structure in the above-mentioned embodiments, respectively. One end of the light path transmission structure 222 away from the light guide arm 224 is connected with the light transmission member 223.

[0215] In implementation, the plane mirror 2221 can be placed at an angle of 45° with the long axis of the hand tool body 221, the focal length of the convex lens 2222 can be 15 mm, and the outer diameter of the convex lens 2222 can be 10 mm.

[0216] The light transmission member 223 can be provided at one end of the hand tool body 221 away from the light guide arm 224, and has a positioning protective shell 2231. The light transmission member 223 and the bottom of the positioning protective shell 2231 are tapered and narrowed, and the target liquid domain includes a liquid domain formed in the dental pulp cavity 225 and / or a liquid domain communicated with the dental pulp cavity 225.

[0217] In implementation, the positioning protective shell 2231 of the light transmission member 223 can have a flow guide function, so that the flushing liquid flowing through the flow guide channel 22122 flows to the dental pulp cavity 225, so that the dental pulp cavity 225 is filled with flushing liquid.

[0218] The light path transmission structure 222 is used for transmitting the laser beam received from the light guide arm 224 to the flushing liquid in the target liquid domain via the light transmission piece 223, forming a focal point in the flushing liquid in the target liquid domain, and using the laser energy to produce a photo-induced breakdown effect in the flushing liquid, induce plasma cavitation to activate the flushing liquid, and flush the root canal.

[0219] Exemplarily, as shown in Figure 23 The root canal flushing hand tool 230 includes a hand tool body 231, a light path transmission structure 232, and a light transmission piece 233.

[0220] The hand tool body 231 can be composed of the light path transmission structure 232, an interface 2311 connected with the light guide arm 234 of the laser emitting device, and a detachable hand tool shell 2312.

[0221] The light path transmission structure 232 can include a concave mirror 2321 with high reflectivity, which can correspond to the first reflection focusing structure in the above-mentioned embodiments. The end of the light path transmission structure 232 away from the light guide arm 234 is connected with the light transmission piece 233.

[0222] In implementation, the concave mirror 2321 can be placed at an angle of 45° with the long axis of the hand tool body 231. The focal length of the concave mirror 2321 can be 15 mm, and the outer diameter of the concave mirror 2321 can be 20 mm.

[0223] The light transmission piece 233 can be arranged at the end of the hand tool body 231 away from the light guide arm 234, and has a positioning and protection shell 2331. The light transmission piece 233 and the bottom of the positioning and protection shell 2331 are tapered and narrowed. The target liquid domain includes a liquid domain formed in the pulp cavity 235 and / or a liquid domain in communication with the pulp cavity 235.

[0224] The light path transmission structure 232 is used for transmitting the laser beam received from the light guide arm 234 to the flushing liquid in the target liquid domain via the light transmission piece 233, forming a focal point in the flushing liquid in the target liquid domain, and using the laser energy to produce a photo-induced breakdown effect in the flushing liquid, induce plasma cavitation to activate the flushing liquid, and flush the root canal.

[0225] In the embodiments of the present application, the root canal flushing hand tool comprises a hand tool body, a light path transmission structure, and a light transmission piece. The hand tool body can be composed of the light path transmission structure, an interface connected with the light guide arm of the laser emitting device, and a detachable hand tool shell. The light path transmission structure is arranged inside the hand tool body and can include an optical reflection focusing structure, which can correspond to the first reflection focusing structure. The end of the light path transmission structure away from the light guide arm is connected with the light transmission piece. The light transmission piece is arranged at the end of the hand tool body away from the light guide arm and has a light guide channel between the first surface and the second surface. The light path transmission structure is optically connected with the light guide channel through the first surface. The light transmission piece is used to form a solid-liquid interface with the flushing liquid in the target liquid domain through the second surface. The target liquid domain includes at least one of the liquid domain formed in the pulp cavity and the liquid domain communicated with the pulp cavity. The light path transmission structure is used to transmit the received laser beam into the flushing liquid in the target liquid domain through the light guide channel and the solid-liquid interface, form a focal point in the flushing liquid in the target liquid domain, and generate a photo-induced breakdown effect in the flushing liquid by using the laser energy, induce plasma cavitation to activate the flushing liquid, and flush the root canal. The root canal flushing hand tool adds the light transmission piece between the air and the liquid surface of the liquid domain in the pulp cavity, so that the laser beam is transmitted into the flushing liquid in the target liquid domain through the light guide channel in the light transmission piece and the solid-liquid interface. In this way, the transmission path of the laser beam does not need to pass through the gas-liquid interface between the air and the flushing liquid, so that the influence of the liquid surface fluctuation of the flushing liquid on the focal point position can be reduced, the stability of the laser light path can be improved, and then the laser can more stably produce a photo-induced breakdown effect on the flushing liquid to form a cavitation bubble, thereby improving the root canal cleaning effect. In addition, since the stability of the laser light path is improved, after the flushing liquid is broken down by the laser beam to form a cavitation bubble, the laser beam can be output again to break down the flushing liquid again, so that a higher laser working frequency can be supported, the generation efficiency of the cavitation bubble can be accelerated, and the root canal cleaning effect can be further improved.

[0226] Based on the above-mentioned root canal flushing hand tool 210, the embodiments of the present application provide a root canal flushing method, which can include the following steps S241 to S249:

[0227] In step S241, the tooth requiring root canal treatment of the patient is isolated by rubber dam under local anesthesia. After the pulp opening and root canal preparation are completed, step S242 is entered.

[0228] In some embodiments, step S242 can also be entered before and / or during the root canal preparation.

[0229] Exemplarily, the root canal flushing method provided by the embodiments of the application can be used in the process of root canal preparation to clean dentin debris generated in the process of root canal preparation.

[0230] Step S242, injecting the root canal flushing liquid into the pulp cavity and / or the root canal of the treated tooth using the syringe and the flushing needle.

[0231] Step S243, putting the root canal flushing tool into the magnetically-adsorbed working shell that has been high-temperature and high-pressure sterilized, and screwing and fixing the tool body and the light-transmitting piece at the threaded port of the end of the tool body connected with the light-transmitting piece.

[0232] Step S244, connecting the end of the tool body connected with the light-transmitting arm with the threaded port of the laser light-transmitting arm through screwing.

[0233] Step S245, connecting the hose for supplying liquid with the liquid injection port of the light-transmitting piece. The hose is used to transmit the root canal flushing liquid from the liquid storage tank to the cavity of the light-transmitting piece, so that the cavity of the light-transmitting piece is filled with the flushing liquid.

[0234] Step S246, starting the laser and opening the liquid injection pump to inject the root canal flushing liquid into the cavity of the light-transmitting piece through the hose in a pumping manner until the cavity of the light-transmitting piece is filled with the root canal flushing liquid, and continuous liquid drops are observed to start dripping at the liquid outlet, which completes the preparation work before the root canal laser flushing.

[0235] Step S247, holding the root canal flushing tool by the operator, placing the liquid outlet of the light-transmitting piece below the root canal flushing liquid surface in the pulp cavity of the tooth to be treated, and starting the laser to irradiate.

[0236] In implementation, the laser focus point is formed in the liquid domain in the cavity of the light-transmitting piece, and the light breakdown effect of the root canal flushing liquid in the cavity of the light-transmitting piece is generated at the focus point to generate plasma and then cavitation bubbles. With the generation, expansion, oscillation and quenching of the cavitation bubbles, the liquid in the cavity of the light-transmitting piece is activated. The activation effect is communicated with the liquid domain formed in the pulp cavity through the liquid outlet of the light-transmitting piece, and then the activation flushing effect on the liquid in the pulp cavity and the root canal is generated.

[0237] In implementation, during the laser irradiation process, the flushing liquid positive pressure pumping device can be started synchronously to pump the liquid, and the root canal flushing liquid enters the pulp cavity of the tooth to be treated through the liquid outlet of the light-transmitting piece, and the excess liquid can be removed by using a dental aspirator.

[0238] Step S248, after the laser flushing operation of the target duration is completed, the operator stops the laser irradiation, removes the hand-held root canal flushing hand tool from the patient's oral cavity, removes the liquid supply connecting hose and the light-transmitting piece, removes the magnetically-attached shell of the root canal flushing hand tool, and disinfects the shell at high temperature and high pressure, and maintains the root canal flushing hand tool.

[0239] Step S249, after the laser flushing operation, the tooth continues to undergo subsequent root canal treatment.

[0240] In some embodiments, the subsequent root canal treatment can include, but is not limited to, root canal medication, or root canal filling treatment procedures, etc.

[0241] It should be understood that the "one embodiment" or "an embodiment" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present disclosure. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. It should be understood that the size of the sequence numbers of the above processes in various embodiments of the present disclosure does not mean the order of execution, and the execution order of the processes should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present disclosure. The sequence numbers of the above embodiments of the present disclosure are only for description, not representing the advantages or disadvantages of the embodiments.

[0242] It should be noted that in this document, the terms "comprise", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "comprises a" does not exclude the presence of additional identical elements in the process, method, article or device including the element.

[0243] In several embodiments provided by the present disclosure, it should be understood that the disclosed device can be implemented in other ways. The above-described device embodiments are only illustrative, for example, the division of the units is only a logical function division, and actual implementation can have another division manner, such as: multiple units or components can be combined, or can be integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the displayed or discussed components can be through some interface, indirect coupling or communication connection between devices or units, which can be electrical, mechanical or other forms.

[0244] The units described as separate parts above can or can not be physically separate, and the parts displayed as units can or can not be physical units; they can be located in one place, or distributed on multiple network units; and part or all of the units can be selected to achieve the purposes of the embodiments according to actual needs.

[0245] In addition, each functional unit in each embodiment of the present disclosure can be integrated into one processing unit, or each unit can be a separate unit, or two or more units can be integrated into one unit; the integrated unit can be realized in the form of hardware or in the form of hardware plus software functional units.

[0246] The above is only an embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present disclosure, which should be covered within the protection scope of the present disclosure.

[0247] The above is only an embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present disclosure, which should be covered within the protection scope of the present disclosure.

Claims

1. A root canal irrigation handpiece, characterized in that, The application relates to a hand tool body, a light path transmission structure arranged inside the hand tool body, and a light transmission member arranged at one end of the hand tool body. The light transmission member has a light guide channel between a first surface and a second surface, and the light path transmission structure is optically connected with the light guide channel through the first surface. The light transmission member is used to form a solid-liquid interface between the second surface and flushing liquid in a target liquid domain. The light path transmission structure is used to transmit a received laser beam into the flushing liquid in the target liquid domain through the light guide channel and the solid-liquid interface, form a focal point in the flushing liquid in the target liquid domain, and generate a photo-induced breakdown effect in the flushing liquid by using laser energy, induce plasma cavitation to activate the flushing liquid, and perform flushing on the root canal. The light transmission member has a cavity inside, and the second surface comprises a top wall of the cavity. The bottom wall and / or the side wall of the cavity have at least one opening for connecting the cavity and the pulp cavity.

2. The root canal irrigation handpiece of claim 1, wherein, The side of the cavity away from the top wall has a first cross section, and the side of the cavity close to the top wall has a second cross section.

3. The root canal irrigation handpiece of claim 2, wherein, The side of the cavity away from the top wall has at least one flow guide channel connecting the cavity and the at least one opening.

4. The root canal irrigation handpiece of claim 3, wherein, The long axis of the hand tool body extends along a first direction.

5. The root canal irrigation handpiece of claim 3, wherein, The light path transmission structure is used to output the received laser beam along the first direction, the first surface intersects the first direction, and the flow direction of the jet intersects the first direction.

6. The root canal irrigation handpiece of claim 3, wherein, The light path transmission structure is used to output the received laser beam along a second direction, the first surface intersects the second direction, the flow direction of the jet is the same as the second direction, and the second direction is perpendicular to the first direction. The target liquid domain further comprises a liquid domain formed in the pulp cavity. The second surface comprises a bottom surface of the light transmission member, and the target liquid domain comprises a liquid domain formed in the pulp cavity.

7. The root canal irrigation handpiece of claim 2, wherein, The long axis of the hand tool body extends along a first direction.

8. The root canal irrigation handpiece of claim 1, wherein, The light path transmission structure comprises a first optical reflection structure, which is used to reflect the received laser beam along the first direction to be output along a third direction.

9. The root canal irrigation handpiece of claim 8, wherein, The light guide channel comprises a second optical reflection structure, which is used to reflect the laser beam output by the light path transmission structure along the first direction to be output along a third direction. ​ ​ ​ The third direction is perpendicular to the first direction.

10. The root canal irrigation handpiece according to claim 9, wherein, The first optical reflection structure comprises a first reflection focusing structure, which is configured to reflect and focus the received laser beam along the first direction, so that the laser beam is focused into the irrigation liquid in the target liquid domain along the third direction via the light guide channel and the solid-liquid interface. Alternatively, The second optical reflection structure comprises a second reflection focusing structure, which is configured to reflect and focus the laser beam along the first direction output by the light path transmission structure, so that the laser beam is focused into the irrigation liquid in the target liquid domain along the third direction via the solid-liquid interface.

11. The root canal irrigation handpiece according to any one of claims 1 to 10, wherein, The light path transmission structure comprises a first optical focusing structure, which is configured to focus the received laser beam, so that the laser beam is focused into the irrigation liquid in the target liquid domain via the light guide channel and the solid-liquid interface; or The light guide channel is provided with a second optical focusing structure, which is configured to focus the laser beam output by the light path transmission structure, so that the laser beam is focused into the irrigation liquid in the target liquid domain via the solid-liquid interface.

12. The root canal irrigation handpiece according to any one of claims 1 to 10, wherein, The light-transmitting piece has a support structure, which is configured to support the light-transmitting piece, so that the light-transmitting piece is supported at the opening of the dental pulp cavity; and / or The bottom of the light-transmitting piece is in a tapered narrowing structure, which is configured to support the light-transmitting piece, so that the light-transmitting piece is supported at the opening of the dental pulp cavity.

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