Ultrasonic brush head and toothbrush

Abstract

The invention discloses an ultrasonic brush head and a toothbrush. The toothbrush comprises the ultrasonic brush head, a brush handle, a handle, a bristle fixing structure, a sound transmission bag, an ultrasonic transducer, a vibration motor, an ultrasonic driving circuit, a battery and a controller, the sound transmission bag and the ultrasonic transducer are arranged in the ultrasonic brush head, the sound transmission bag wraps the focused or non-focused ultrasonic transducer, and double-frequency ultrasonic waves generated by the ultrasonic transducer are transmitted to the surfaces of teeth and gingiva through liquid or an ultrasonic coupling agent with good sound transmission in the sound transmission bag. The bristle fixing structure is of a special structure and can be detached and replaced. And the bristles and the sound transmission bag have various position layouts. An ultrasonic drive circuit, a vibration motor, a battery and a control circuit are arranged in the handle. The control circuit is powered by the battery, and the output of the control circuit is connected with the ultrasonic drive circuit and the vibration motor, so that the ultrasonic transducer sends out double-frequency ultrasonic waves and the motor vibrates, the effects of removing dental plaque and diminishing inflammation are achieved, and the purpose of ultrasonic tooth cleaning is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of oral care products, in particular to an ultrasonic brush head and a toothbrush. Background Art

[0002] An ultrasonic toothbrush is a high-frequency vibrating electric toothbrush whose vibration frequency reaches the ultrasonic range, i.e., at least 20 kHz. The ultrasonic toothbrush is the fourth generation of new toothbrush following the ordinary toothbrush, electric toothbrush and sonic toothbrush. It uses the cavitation effect excited by high-frequency sound waves to achieve efficient cleaning of teeth and oral cavity. Ultrasonic waves can not only directly kill bacteria and inhibit the formation of dental plaque, but also scour the tooth surface and hidden dental calculus and stains through high-energy molecules generated by cavitation, so as to achieve the effect of cleaning and protecting teeth.

[0003] At present, significant progress has been made in the technology of ultrasonic toothbrushes, which are widely used in the field of oral health. The existing technologies are divided into three categories according to the structure. The first type of ultrasonic toothbrush contains a piezoelectric transducer in the brush head to generate ultrasonic waves, and the ultrasonic waves are transmitted to the teeth and gums through the bristles. However, a large part of the ultrasonic energy generated by the piezoelectric transducer is lost due to the mismatch of acoustic impedance between media. Moreover, when a piezoelectric sheet is built into the brush head to generate ultrasonic vibration, since the cavitation effect generated by a single frequency is very weak, these weak ultrasounds basically cannot play the role of ultrasonic deep cleaning. Therefore, the ultrasonic transmission efficiency of this type of ultrasonic toothbrush is low and the cavitation effect is weak. The second type of ultrasonic toothbrush improves the transmission efficiency of ultrasonic waves from the transducer through toothpaste and the fluid in the oral cavity to the teeth and gums by adding a waveguide at the brush head, and transmits ultrasonic waves to the teeth and gums more efficiently than the bristles in the first type of ultrasonic toothbrush. However, the interface between the waveguide and the transducer and the waveguide itself still attenuate the ultrasonic energy generated by the transducer. The third type of ultrasonic toothbrush places the transducer outside the brush head. The exposed piezoelectric transducer sometimes contacts the teeth during toothbrushing, and the high-frequency vibration of the piezoelectric transducer contacting the teeth will bring an uncomfortable feeling to the user. Moreover, there are safety hazards when the exposed piezoelectric transducer is used for toothbrushing. Therefore, the practicability of the third type of ultrasonic toothbrush is limited.

[0004] By analyzing the above existing technologies, the following problems exist in the current design and technology of ultrasonic toothbrushes: (1) The existing brush head cannot solve the problem that toothpaste foam hinders the propagation of ultrasonic waves, resulting in extremely low efficiency of the ultrasonic waves generated by the brush head being transmitted to the teeth and gums. The ultrasonic waves generated by the piezoelectric transducer need to be transmitted to the teeth and gums through toothpaste foam. However, the acoustic impedance differences of these media are large, resulting in reflection of ultrasonic waves during propagation, and most of the ultrasonic energy is attenuated, greatly reducing the effective ultrasonic energy reaching the tooth and gum surfaces, thereby reducing the conduction efficiency of ultrasonic waves.

[0005] (2) The cavitation effect generated by single-frequency ultrasonic waves is weak and cannot achieve the effect of removing dental plaque and reducing inflammation. The bactericidal efficacy of ultrasonic waves is mainly caused by the cavitation effect. When ultrasonic waves act on a liquid medium, ultrasonic-induced cavitation generates tiny bubbles in the liquid. The bubbles eventually become unstable and collapse, releasing high temperature and high pressure on the microscopic scale. During the compression stage of ultrasonic waves, the violent collapse of transient cavitation generates physical effects such as shock waves and chemical effects caused by OH free radicals. Cavitation nuclei are the basis for bubble formation, and their quantity and distribution are crucial for the strength of the cavitation effect. It is difficult for single-frequency ultrasound to generate and activate cavitation nuclei more effectively like dual-frequency ultrasound through the interference and superposition of sound waves with different frequencies. Therefore, the number of cavitation nuclei generated under the action of single-frequency ultrasound is small, and the cavitation effect is weak, which in turn affects the cleaning ability of the tooth and gum surfaces and crevices, and cannot achieve the effect of removing dental plaque and reducing inflammation.

[0006] In summary, there is a need for an ultrasonic toothbrush that can transmit ultrasonic waves to the target to be cleaned. Summary of the Invention

[0007] In view of this, the purpose of the present invention is to provide an ultrasonic toothbrush head and an ultrasonic toothbrush. The toothbrush isolates toothpaste foam through a sound-transmitting sac provided on the toothbrush head to transmit ultrasonic waves to the tooth and gum surfaces and adopts dual-frequency technology, solving the technical problems of serious energy loss during ultrasonic wave transmission and weak cavitation effect in the prior art.

[0008] To achieve the above purpose, the present invention provides the following technical solutions: The ultrasonic toothbrush head provided by the present invention includes a toothbrush head body, bristles, an ultrasonic transducer, and a sound-transmitting sac; an ultrasonic transducer is provided in the toothbrush head body, the ultrasonic transducer is used to generate ultrasonic waves, the sound-transmitting sac is placed on the toothbrush head body, and the ultrasonic waves are transmitted to the target to be cleaned through the filling material in the sound-transmitting sac. The bristles are provided on the toothbrush head body, and the ultrasonic transducer is provided in the sound-transmitting sac and is adapted to contact the surface of the target to be cleaned when contacting the target to be cleaned around the sound-transmitting sac, so as to be suitable for the bristles and the ultrasonic waves emitted by the sound-transmitting sac to act on the target to be cleaned synergistically.

[0009] Further, the operating frequency of the ultrasonic transducer is 20KHz - 6MHz; the ultrasonic transducer can emit any one or more of single-frequency, dual-frequency, and multi-frequency ultrasonic waves; When the ultrasonic transducer emits single-frequency ultrasonic waves, the sound power is 0.01W - 0.2W; or When the ultrasonic transducer emits dual-frequency ultrasonic waves, the sound power is 0.01W - 0.4W; or When the difference Δ between the ultrasonic waves of the two frequencies generated by the ultrasonic transducer Satisfies the following relationship: Δ Δ ≤0.1 wherein, is the first frequency; is the second frequency; is the intermediate frequency; or when the ultrasonic transducer emits multi-frequency ultrasonic waves, the sound power is 0.01W - 0.4W, and the difference Δ between two adjacent frequencies of ultrasonic waves generated by the ultrasonic transducer satisfies the following relationship: Δ Δ ≤0.1 wherein, is the nth frequency; is the (n + 1)th frequency; is the intermediate frequency between two adjacent frequencies.

[0010] Furthermore, the ultrasonic transducer uses a piezoelectric material, and the piezoelectric material includes any one or a combination of piezoelectric ceramics, piezoelectric single crystals, piezoelectric polymers, and piezoelectric composites, and the number of ultrasonic transducers is at least one.

[0011] Furthermore, the material of the sound-transmitting sac is a flexible polymer material, and the flexible polymer material is any one of medical silica gel, food-grade silica gel, and thermoplastic polyurethane.

[0012] Furthermore, the filling material in the sound-transmitting sac uses an ultrasonic coupling agent, and the ultrasonic coupling agent in the sound-transmitting sac contacts the ultrasonic transducer, so that ultrasonic waves are transmitted to the surface to be cleaned through the ultrasonic coupling agent.

[0013] Furthermore, the bristles are arranged on the outer side or the inner side of the sound-transmitting sac, and the bristles are arranged on the brush head body through a detachable fixing structure, and the fixing structure adopts a bayonet connection structure in which a clamping block cooperates with a clamping groove; or an insertion connection structure in which a groove cooperates with a convex rib.

[0014] Furthermore, the ultrasonic transducer is a focused ultrasonic transducer or a non-focused ultrasonic transducer; when a focused ultrasonic transducer is used, the transducer is configured to focus ultrasonic energy on the target area to be cleaned; when a non-focused ultrasonic transducer is used, the transducer is configured to diverge ultrasonic energy to cover multiple areas of the target surface to be cleaned.

[0015] The ultrasonic toothbrush made using the above ultrasonic brush head provided by the present invention includes an ultrasonic brush head, a handle, a controller, an ultrasonic drive circuit, a battery, and a vibration motor; the ultrasonic brush head is connected to the handle, and the controller and the ultrasonic drive circuit are arranged in the handle; the controller is connected to the ultrasonic drive circuit, and the ultrasonic drive circuit is connected to the ultrasonic transducer in the ultrasonic brush head.

[0016] Further, the ultrasonic drive circuit is a circuit capable of generating any one of single-frequency, dual-frequency, and multi-frequency drive signals.

[0017] Further, the vibration motor is arranged on the handle; the controller is connected to the vibration motor, and the vibration motor is connected to the ultrasonic brush head; it is used to drive the ultrasonic brush head to vibrate, and the vibration motor vibrates 9000 - 40000 times per minute.

[0018] The present invention discloses an ultrasonic brush head and a toothbrush. The toothbrush includes an ultrasonic brush head, a brush handle, a handle, a bristle fixing structure, a sound-transmitting sac, an ultrasonic transducer, a vibration motor, an ultrasonic drive circuit, a battery, and a controller; the ultrasonic brush head of the present invention is internally provided with a sound-transmitting sac and an ultrasonic transducer. The sound-transmitting sac wraps a focused or non-focused ultrasonic transducer. The dual-frequency ultrasonic waves generated by the ultrasonic transducer are transmitted to the tooth and gum surfaces through a liquid with good sound-transmitting property or an ultrasonic coupling agent in the sound-transmitting sac. The bristle fixing structure adopts a special structure to achieve detachable replacement. There are various position layouts between the bristles and the sound-transmitting sac. An ultrasonic drive circuit, a vibration motor, a battery, and a control circuit are arranged in the handle. The control circuit is powered by the battery. The output of the control circuit is connected to the ultrasonic drive circuit and the vibration motor, so that the ultrasonic transducer emits dual-frequency ultrasonic waves and the motor vibrates, achieving the effect of removing dental plaque and reducing inflammation, and realizing the purpose of ultrasonic tooth cleaning.

[0019] The brush head provided by the present invention isolates toothpaste foam through the provided sound-transmitting sac structure. The sound-transmitting sac is a material with high sound-transmitting property, which can effectively reduce the reflection and attenuation caused by the mismatch of medium acoustic impedance during the transmission of ultrasonic waves. Moreover, the sound-transmitting sac can fully fit the teeth and gums, and can squeeze out the toothpaste foam on the teeth and gums during the brushing process, achieving the effect of isolating toothpaste foam, so that ultrasonic waves can be maximally transmitted to the tooth and gum surfaces.

[0020] The brush head provided by the present invention adopts dual-frequency ultrasonic technology to enhance the cavitation effect. It is confirmed by experimental results that dual-frequency or multi-frequency ultrasonic excitation can significantly enhance the acoustic cavitation effect. The intensity of the cavitation effect induced by dual-frequency ultrasonic irradiation is higher than that of single-frequency ultrasonic waves. Under the action of dual-frequency or multi-frequency ultrasonic waves, the frequency range of the synthesized sound field is much larger than the sum of the spectral frequencies of each sound field, thereby expanding the range of bubble sizes involved in the cavitation process and increasing the total number of cavitation bubbles.

[0021] Compared with the prior art, the beneficial effects of the present invention are reflected in the following aspects: The sound-transmitting sac structure improves the ultrasonic conduction efficiency. The design of the sound-transmitting sac directly contacting the tooth and gum surfaces and isolating air greatly improves the ultrasonic conduction efficiency from the transducer to the tooth. Compared with traditional ultrasonic toothbrushes, it can utilize ultrasonic energy for cleaning more effectively, making the tooth cleaning effect more remarkable, especially for difficult-to-clean areas such as dental floss gaps and gingival sulci.

[0022] The dual-frequency technology enhances the cavitation effect. Dual-frequency or multi-frequency ultrasound enhances the cavitation effect. The adoption of dual-frequency or multi-frequency covers a wider range of bubble resonance, enabling more bubbles to enter the resonance state, thereby enhancing the cavitation effect to achieve the effect of removing dental plaque on the tooth surface and anti-inflammation. And it provides a more comfortable and comprehensive oral cleaning experience, promoting the development of oral care technology.

[0023] The detachable and replaceable structure of the bristles reduces the usage cost. The detachable and replaceable structure of the bristles facilitates users to replace the bristles after damage, prolongs the overall service life of the toothbrush, and reduces the usage cost.

[0024] Generating a large number of small bubbles through the bristles can enhance the cavitation effect. It can not only quickly generate small bubbles to synergistically enhance the cavitation effect with ultrasound but also has a self-cleaning function.

[0025] Other advantages, objectives, and features of the present invention will be described to some extent in the subsequent specification, and to some extent, will be obvious to those skilled in the art based on the study of the following text, or can be learned from the practice of the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the following specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] To make the objectives, technical solutions, and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration.

[0027] Figure 1 It is a schematic diagram of the overall structure of the ultrasonic toothbrush of the present invention.

[0028] Figure 2 It is a three-dimensional overall structure schematic diagram of the ultrasonic toothbrush of the present invention.

[0029] Figure 3 It is a front view schematic diagram of the structure of the toothbrush head in the first positional relationship.

[0030] Figure 4 It is a top view schematic diagram of the structure of the toothbrush head in the first positional relationship.

[0031] Figure 5It is a front view schematic diagram of the structure of the toothbrush head in the second positional relationship.

[0032] Figure 6 It is a top view schematic diagram of the structure of the toothbrush head in the second positional relationship.

[0033] Figure 7 It is a front view schematic diagram of the structure of the toothbrush head in the third positional relationship.

[0034] Figure 8 It is a top view schematic diagram of the structure of the toothbrush head in the third positional relationship.

[0035] Figure 9 It is an ultrasonic toothbrush sound power detection platform.

[0036] Figure 10 It is a comparison diagram of the sound power amplitude of an ultrasonic toothbrush with water and foam filled in the sound transmission capsule.

[0037] Figure 11 It is an ultrasonic toothbrush cavitation effect detection platform.

[0038] Figure 12 It is a comparison diagram of the single / double - frequency transient cavitation intensity of an ultrasonic toothbrush.

[0039] Among them, 1 - toothbrush head body, 2 - toothbrush handle, 3 - handle, 4 - ultrasonic transducer, 41 - ultrasonic reflection concave surface, 5 - sound transmission capsule, 5a - circular sound transmission capsule, 5b - annular sound transmission capsule, 5c - protrusion, 5d - sound transmission liquid; 6 - bristle fixing structure, 6a - annular bristle fixing structure, 6b - circular bristle fixing structure, 7 - bristles, 8 - vibration motor, 9 - ultrasonic drive circuit, 10 - controller, 11 - battery, 12 - bump, 13 - power switch, 14 - power amplifier I, 15 - iron stand, 16 - ultrasonic toothbrush, 17 - acoustic radiation force balance, 18 - display, 19 - passive cavitation detector, 20 - cavitation detection probe, 21 - dual - frequency ultrasonic transducer, 22 - power amplifier II. Specific embodiments

[0040] The following further illustrates the present invention in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and be able to implement it, but the embodiments cited do not limit the present invention.

[0041] Embodiment 1 As Figure 3-8 shown, the ultrasonic toothbrush head provided in this embodiment includes a toothbrush head body 1, bristles 7, an ultrasonic transducer 4, and a sound transmission capsule 5; An ultrasonic transducer 4 is provided in the brush head body 1, and the ultrasonic transducer 4 is used to generate ultrasonic waves. The sound-transmitting sac 5 is placed on the brush head body 1, and the ultrasonic waves are transmitted to the target to be cleaned through the filling material in the sound-transmitting sac 5. A bristle 7 is also provided on the brush head body 1, which is adapted to contact the surface of the target to be cleaned when contacting the target to be cleaned around the sound-transmitting sac 5; so as to be suitable for the ultrasonic waves emitted by the bristle 7 and the sound-transmitting sac 5 to act on the target to be cleaned synergistically.

[0042] In this embodiment, the bristles 7 are arranged around the sound-transmitting sac 5. During use, a large number of small bubbles are generated by disturbing the toothpaste through the bristles 7. In addition to being directly transmitted to the surface of the target to be cleaned by the ultrasonic waves emitted by the sound-transmitting sac 5, cavitation effects occur between the ultrasonic waves and the large number of small bubbles generated by the bristles 7 on the target surface, that is, the small bubbles burst rapidly under the action of ultrasonic waves, overcoming the drawback that a large number of small bubbles cannot be generated and the cavitation effect is weak without the bristles 7. Therefore, the bristles 7 and the sound-transmitting sac 5 in this embodiment can synergistically enhance the cavitation effect, so as to achieve better effects of ultrasonic waves on cleaning teeth, eliminating dental plaque, and anti-inflammatory of gums.

[0043] At the same time, the ultrasonic waves in the sound-transmitting sac 5 can also cause cavitation effects in the small bubbles between adjacent bristles 7, so as to realize the cleaning and sterilization functions of the bristles 7, making the bristles 7 and the sound-transmitting sac 5 have a self-cleaning effect; moreover, the ultrasonic waves in the sound-transmitting sac 5 can also cause the bristles 7 to vibrate at high frequency, so the ultrasonic waves can make the cleaning effect of the bristles 7 more efficient.

[0044] The piezoelectric material includes at least any one or a combination of piezoelectric ceramics, piezoelectric single crystals, and piezoelectric polymers. The number of the ultrasonic transducers 4 is one, two, or more, preferably two. The ultrasonic transducer 4 is made of piezoelectric material, preferably 1-3 type piezoelectric composite material.

[0045] The material of the sound-transmitting sac 5 is a flexible polymer material, and the flexible polymer material is any one of medical silicone, food-grade silicone, or thermoplastic polyurethane; the flexible polymer material is a material with good mechanical properties (flexibility, wear resistance, and compressive resistance), sound transmission properties, and non-toxicity; the filling material in the sound-transmitting sac 5 is a liquid with good sound transmission properties as an ultrasonic coupling agent, preferably degassed water, and ordinary liquid water can also be filled in the sound-transmitting sac 5 according to actual situations.

[0046] The ultrasonic transducer 4 is arranged in the sound-transmitting sac 5, and the degassed water in the sound-transmitting sac 5 contacts the ultrasonic transducer 4, so that the ultrasonic waves are transmitted to the target to be cleaned through the degassed water; The outer shape of the sound-transmitting sac 5 is designed to be a smooth shape suitable for the shape of the brush head, preferably circular, annular, etc.

[0047] The sound-transmitting sac 5 is a circular sac. The inner side of the circular sac wraps the ultrasonic transducer 4, and the bristles 7 are arranged around the circular sac; the bristles 7 are arranged on the brush head body 1 through a detachable fixing structure, and the fixing structure adopts a bayonet connection structure with a snap block and a slot in cooperation; As Figure 6 shown, the sound-transmitting sac 5 is an annular sac. The annular sac is arranged on the brush head body 1. The middle part of the annular sac is provided with bristles 7, and the ultrasonic transducer 4 is arranged in the inner annular area of the annular sac; the bristles 7 are arranged on the brush head body 1 through a detachable fixing structure, and the fixing structure adopts a plug-in connection structure with a groove and a convex rib in cooperation; As Figure 4 shown, Figure 4 In a, the sound-transmitting sac 5 without the protrusion 5c is shown, and in b, the sound-transmitting sac 5 with the protrusions 5c arranged at intervals is shown; among them, 5c represents a protrusion structure for embedding into the gaps between the cleaning targets; the lateral outer surface of the sound-transmitting sac 5 is provided with protrusions 5c, and the protrusions 5c can be embedded into the gaps between the targets to be cleaned during use, so as to transmit ultrasonic waves to the gap positions; The protrusion 5c is a triangular strip shape, the protrusions 5c are arranged at intervals, and the length of the protrusion 5c ≤ the lateral length of the sound-transmitting sac.

[0048] The sound-transmitting sac 5 is a circular sac or an annular sac, and the ultrasonic transducer 4 is arranged inside the circular sac and the annular sac.

[0049] In this embodiment, 2-3 triangular strip-shaped triangular protrusions can be arranged on the lateral outer surface of the sound-transmitting sac 5, with a height of 1-3 mm, an interval of 5 mm - 10 mm, and a length ≤ the lateral length of the sound-transmitting sac. The strip-shaped triangular protrusions can be embedded into the tooth gaps to transmit sound waves to the tooth gap positions; As Figure 3 and 5 shown, Figure 3 is a brush head provided with an ultrasonic reflection concave surface 41, Figure 5 represents a brush head without the ultrasonic reflection concave surface 41 and a sound-transmitting sac 5 without the protrusion 5c; Figure 3 In the sound-transmitting sac 5 in, a sound-transmitting liquid 5d is provided; 5c represents a protrusion. In this embodiment, a ultrasonic reflection surface is arranged on one side of the ultrasonic transducer 4, and the ultrasonic reflection concave surface 41 is used to reflect the generated ultrasonic waves back to the target to be cleaned; In this embodiment, the ultrasonic reflection concave surface 41 is preferably a parabolic surface or a spherical surface, and the concave surface can refocus the reflected wave onto the tooth or gum surface again, improving the utilization rate of ultrasonic energy.

[0050] A friction layer is provided at the front end of the sound-transmitting sac 5. The friction layer is used to increase the friction between the front end of the sound-transmitting sac 5 and the surface of the target to be cleaned, and the friction layer is used to better remove dental plaque, food residues, etc. on the surface of the target to be cleaned; the friction layer can be set as a textured layer or a dot layer distributed at intervals. The thickness of the sound-transmitting sac 5 is an integer multiple of half the wavelength of the ultrasonic wave.

[0051] In this embodiment, the thickness of the sound-transmitting sac 5 can be set as λ / 2; where λ is the wavelength; the purpose of half a wavelength is to allow the sound wave to better penetrate and be transmitted to the teeth or gums. The sound-transmitting sac 5 is fixed to the brush head body 1 by an integral molding process using medical-grade silicone.

[0052] The ultrasonic transducer 4 is a focused ultrasonic transducer or a non-focused ultrasonic transducer; when a focused ultrasonic transducer is used, the transducer is configured to focus the ultrasonic energy on a specific area of the teeth or gums (the target to be cleaned); when a non-focused ultrasonic transducer is used, the transducer is configured to diverge the ultrasonic energy to cover multiple areas on the tooth surface.

[0053] For the focused ultrasonic transducer, the energy density after focusing is at the focal point, which is suitable for removing local dental plaque. When in use, the user aligns the brush head with the target area (such as the interdental space or the gum line), and in the focused mode, the ultrasonic energy is concentrated in this area, and the plaque is efficiently decomposed through the cavitation effect and microfluidic action. The brush head is made of silicone material, and the surface is designed with a wavy micro-structure to reduce energy reflection and improve transmission efficiency. The ultrasonic energy emitted by the non-focused ultrasonic transducer evenly covers the tooth surface. In the non-focused mode, the ultrasonic energy propagates in a divergent manner to achieve comprehensive cleaning.

[0054] Embodiment 2 As Figure 1 、 Figure 2 shown, Figure 1 is the overall structural schematic diagram of the ultrasonic toothbrush 16 provided in this embodiment, Figure 2 is the three-dimensional overall structural schematic diagram of the ultrasonic toothbrush 16 provided in this embodiment; in this embodiment, the sound-transmitting sac 5 can be in the form of a water sac, that is, the sound-transmitting sac 5 is filled with a degassed water sound-transmitting medium; this embodiment provides an ultrasonic toothbrush 16, including an ultrasonic brush head, a handle 3, a controller 10, an ultrasonic drive circuit 9, a battery 11, and a vibration motor 8; the ultrasonic brush head is connected to the handle 3. The ultrasonic drive circuit 9 can provide any one of single-frequency, dual-frequency, and multi-frequency drive signals, preferably a dual-frequency drive signal.

[0055] The controller 10 is connected to the ultrasonic driving circuit 9, and the ultrasonic driving circuit 9 is connected to the ultrasonic transducer 4 in the ultrasonic brush head; the number of the ultrasonic transducers 4 is two; the ultrasonic transducers 4 generate dual-frequency ultrasonic waves with a sound power of 0.01W - 0.4W under the drive of the dual-frequency driving circuit; the difference Δ between the two frequencies of the ultrasonic waves generated by the ultrasonic transducer 4 satisfies the following relationship: Δ Δ ≤0.1 wherein, is the first frequency; is the second frequency; is the intermediate frequency; In this embodiment, the ultrasonic brush head is connected to the handle 3 through the brush handle 2.

[0056] The ultrasonic brush head in this embodiment is internally provided with a sound-transmitting sac 5 and an ultrasonic transducer 4. The sound-transmitting sac 5 wraps the ultrasonic transducer 4, and the transducer is placed at the bottom of the sound-transmitting sac 5. The brush hair fixing structure 6 adopts a special structure to achieve detachable replacement. There are various position layouts between the brush hairs 7 and the sound-transmitting sac 5, such as brush hairs 7 on the outer side of the inner sound-transmitting sac, brush hairs 7 in the middle of the annular sound-transmitting sac, or a form of a fully sound-transmitting sac without brush hairs.

[0057] The sound-transmitting sac 5 is located inside the brush head. The ultrasonic transducer 4 is immersed in the sound-transmitting sac 5. The sound-transmitting sac 5 extends from the brush head and can contact the tooth surface, effectively isolating toothpaste foam and enabling ultrasonic waves to be directly and efficiently transmitted to the tooth surface.

[0058] The brush hairs 7 are DuPont brush hairs. The brush hair fixing structure 6 is designed with a plurality of holes for embedding the brush hairs 7 to ensure the stability of the brush hairs 7. The shape of the brush hair fixing structure 6 is determined according to the shape of the sound-transmitting sac 5.

[0059] The outer shape of the sound-transmitting sac 5 is designed to be a smooth shape suitable for the brush head shape. This shape can wrap the piezoelectric sheet and closely cooperate with the brush hair area. The shape of the sound-transmitting sac 5 can closely fit the tooth surface and provide uniform liquid contact. The surface of the sound-transmitting sac 5 is provided with bumps 12 to increase the friction with the tooth surface.

[0060] The positional relationship between the sound-transmitting sac 5 and the brush hairs 7: The sound-transmitting sac 5 is on the inner side, and the brush hairs 7 are filled around the outer side of the sound-transmitting sac 5. The sound-transmitting sac 5 directly contacts the tooth surface. This structure enables the sound-transmitting sac 5 to first contact the tooth surface, utilize the sound-transmitting sac 5 to conduct ultrasonic waves, and at the same time, the brush hairs 7 assist in cleaning the tooth surface and tooth gaps.

[0061] The detachable bristle fixing structure 6 of the outer bristles of the inner sound-transmitting sac 5 adopts a bayonet connection. A clamping block is arranged at the edge of the bristle fixing structure 6, and a clamping groove is correspondingly arranged on the inner side of the brush head housing. The detachable installation of the bristle assembly is realized through the cooperation of the clamping block and the clamping groove. At the same time, a rubber sealing ring is arranged at the connection part to ensure water tightness; The sound-transmitting sac 5 is arranged in a ring shape. The bristles 7 are filled in the suspended part in the middle of the sound-transmitting sac 5, forming a unique brush head structure, which further improves the ultrasonic conduction efficiency and cleaning effect. The sound-transmitting sac 5 directly contacts the tooth surface. The annular sound-transmitting sac 5b can form a uniform ultrasonic conduction area around the teeth, and the middle bristles 7 are responsible for key cleaning of the tooth surface. The detachable bristle fixing structure 6 of the outer sound-transmitting sac of the inner bristles adopts a plug-in connection. An annular groove is arranged on the inner side of the sound-transmitting sac 5, and a convex rib is arranged at the corresponding position of the bristle fixing structure 6. The fixing and disassembly of the brush head assembly are realized through the cooperation of the groove and the convex rib, and the connection gap is sealed with sealant; The sound-transmitting sac 5 completely covers the brush head without filling bristles and without additional filling of bristles. It is designed for users who pursue the ultimate ultrasonic cleaning effect and provides the strongest cleaning power. The sound-transmitting sac 5 directly contacts the tooth surface, and this structure maximally utilizes the ultrasonic conduction function of the sound-transmitting sac 5.

[0062] In the handle 3 of this embodiment, an ultrasonic drive circuit 9, a vibration motor 8, a battery 11 and a controller 10 are provided. The ultrasonic drive circuit 9, the vibration motor 8 and the controller 10 are all powered by the battery 11. The output of the controller 10 is connected to the ultrasonic drive circuit 9 and the vibration motor 8, so that the ultrasonic transducer 4 emits dual-frequency ultrasonic waves and the vibration motor 8 vibrates 9000 - 40000 times per minute.

[0063] In the handle 3 of this embodiment, a power button is further provided for controlling the on / off of the toothbrush.

[0064] Embodiment 3 The following further describes the ultrasonic toothbrush 16 in detail with specific embodiments.

[0065] In this embodiment, the sound-transmitting liquid 5d in the sound-transmitting sac 5 adopts degassed water; degassed water is a common ultrasonic coupling agent.

[0066] As Figure 3 、 4 shown, among which, Figure 3 is a brush head provided with an ultrasonic reflection concave surface 41, and the brush head structure adopts a design in which the sound-transmitting sac 5 is on the inner side, the bristles 7 are filled around the outer side of the sound-transmitting sac 5, and the sound-transmitting sac 5 directly contacts the tooth surface.

[0067] First, the ultrasonic transducer 4 is precisely installed at a preset position inside the brush head 1 to ensure that it is completely immersed in the circular sound-transmitting capsule 5a. The inner side of the circular sound-transmitting capsule 5a tightly wraps the ultrasonic transducer 4, and the outer side contacts the tooth surface. The bristles 7 are made of soft and elastic DuPont bristles, which are evenly fixed on the annular bristle fixing structure 6a. A bayonet-type connection structure is adopted between the annular bristle fixing structure 6a and the outer shell of the brush head 1. A card block is set on the edge of the annular bristle fixing structure 6a, and a card slot is set on the inner side of the outer shell of the brush head 1. The detachable installation of the annular bristle fixing structure 6a is realized by the cooperation of the card block and the card slot. At the same time, a rubber sealing ring is set at the connection part to ensure water tightness.

[0068] The power amplifier 14 and the acoustic radiation force balance 17 are used to detect the acoustic power of the ultrasonic toothbrush 16 filled with degassed water and foam in the sound-permeable capsule 5. The experimental device is as follows: Figure 9 As shown, the ultrasonic toothbrush 16 is fixed to the iron frame 15, and the power amplifier 14 drives the ultrasonic toothbrush 16 to emit ultrasonic waves. Figure 10 As shown, the sound power emitted by the ultrasonic toothbrush 16 with degassed water filled in the sound-transmitting capsule 5 is approximately two orders of magnitude of the sound power emitted by the ultrasonic toothbrush 16 with foam filled in the sound-transmitting capsule 5. The sound power emitted by the ultrasonic toothbrush 16 with foam filled in the sound-transmitting capsule 5 is only the environmental noise, which means that the foam has a great attenuation effect on the ultrasonic wave, and the effective energy that can reach the tooth surface is very small. It also means that the sound-transmitting capsule 5 can effectively isolate the foam and maximize the transmission of the ultrasonic wave.

[0069] The acoustic cavitation intensity generated by single-frequency and dual-frequency ultrasound is detected using a power amplifier 14, a power amplifier 22 and a passive cavitation detector 19. The experimental device is as follows: Figure 11 As shown, the dual-frequency ultrasonic transducer 21 is placed in a soundproof water tank, the power amplifier 14 and the power amplifier 22 drive the dual-frequency ultrasonic transducer 21, the cavitation detection probe 20 is directly facing the focus of the dual-frequency ultrasonic transducer 21, the passive cavitation detector 19 collects data, the Labview software receives the data, and finally the data is processed by MATLAB, and the final processing result is output to the display 18. The result is as shown in FIG. Figure 12 As shown in the figure, the transient cavitation intensity of dual-frequency ultrasound is about 6 times that of single-frequency ultrasound, indicating that dual-frequency ultrasound can enhance acoustic cavitation.

[0070] In this embodiment, a switch key 13 is provided on the outside of the handle 3, and an ultrasonic drive circuit 9, a vibration motor 8, a battery 11 and a controller 10 are provided inside the handle 3. The battery 11 is electrically connected to the ultrasonic drive circuit 9, the vibration motor 8 and the controller 10 respectively, and the switch key 13 is electrically connected to the controller 10, and the switch key 13 is used to control the connection and disconnection of the battery 11; In this embodiment, the output of the controller 10 is connected to the ultrasonic drive circuit 9 and the vibration motor 8, causing the ultrasonic transducer 4 to emit ultrasonic waves and the motor to vibrate. The battery 11 supplies power to the controller 10 and generates current. The controller 10 issues a control signal to cause the ultrasonic drive circuit 9 to apply a voltage to the ultrasonic transducer 4, causing the ultrasonic transducer 4 to generate an operating frequency of 20 kHz to 6 MHz. The controller 10 generates a control signal with a pulse width of 150 Hz - 700 Hz through the drive circuit to drive the motor to vibrate. When the motor operates, it drives the brush head 1 to vibrate together with the brush handle 2.

[0071] As Figure 5 , 6 shown, the brush head structure of this ultrasonic toothbrush 16 is such that the sound-transmitting sac 5 is annular, the bristles 7 are filled in the suspended part in the middle of the sound-transmitting sac 5, and the sound-transmitting sac 5 is in direct contact with the tooth surface.

[0072] When manufacturing the brush head, the annular sound-transmitting sac 5b is fixed at a specific position on the brush head 1. The structure of the annular sound-transmitting sac 5b is manufactured by an integral molding process, and the material is also medical-grade silicone. The ultrasonic transducer 4 is installed in the inner annular area of the annular sound-transmitting sac 5b to ensure that the piezoelectric sheet is immersed in the sound-transmitting sac 5. The bristles 7 are fixed on the circular bristle fixing structure 6b. The connection between the circular bristle fixing structure 6b and the housing of the brush head 1 adopts a plug-in structure. An annular groove is provided on the inner side of the annular sound-transmitting sac 5b, and a convex rib is provided at the corresponding position of the circular bristle fixing structure 6b. The fixing and disassembly of the brush head assembly are realized through the cooperation of the groove and the convex rib, and the connection gap is sealed with a sealant.

[0073] During use, the controller 10 drives the ultrasonic transducer 4 to work. The annular sound-transmitting sac 5b evenly conducts ultrasonic waves to the periphery of the teeth, and the middle bristles 7 perform a detailed cleaning of the tooth surface.

[0074] As Figure 7 , 8 shown, the brush head structure of the ultrasonic toothbrush 16 of the present invention is a structure in which the sound-transmitting sac 5 completely covers the brush head and does not fill the bristles.

[0075] When manufacturing the brush head, a large-area sound-transmitting sac 5 is covered on the entire surface of the brush head 1. The sound-transmitting sac 5 is closely attached to the housing of the brush head 1 through processes such as hot pressing. The ultrasonic transducer 4 is installed at the core position inside the brush head 1 below the sound-transmitting sac 5, and the ultrasonic transducer 4 is completely wrapped by the sound-transmitting sac 5. The sound-transmitting sac 5 and the housing of the brush head 1 are ensured to be leak-free by means such as sealed welding, and some textures or bumps 12 can be provided on the surface of the sound-transmitting sac 5 to increase the friction with the tooth surface and assist ultrasonic cleaning.

[0076] After the user turns on the toothbrush, the controller 10 drives the ultrasonic transducer 4 through the ultrasonic drive circuit 9. The ultrasonic waves act directly on the tooth surface through the fully covered sound-transmitting sac 5. Since there is no interference from the bristles 7, the cavitation effect of the ultrasonic waves can be maximally exerted, which is especially suitable for users with high requirements for ultrasonic cleaning.

[0077] The above-described embodiments are only preferred embodiments given to fully illustrate the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art on the basis of the present invention are within the protection scope of the present invention. The protection scope of the present invention is subject to the claims.

Claims

1. An ultrasonic brush head, characterized in that: It includes a brush head body (1), bristles (7), an ultrasonic transducer (4), and a sound-transmitting sac (5); an ultrasonic transducer (4) is provided in the brush head body (1), the ultrasonic transducer (4) is used to generate ultrasonic waves, the sound-transmitting sac (5) is placed on the brush head body (1), the ultrasonic transducer (4) is arranged in the sound-transmitting sac (5), and the ultrasonic waves are transmitted to the target to be cleaned through the filling material in the sound-transmitting sac (5), and the bristles (7) are arranged on the brush head body (1) and are adapted to contact the surface of the target to be cleaned when contacting the target to be cleaned around the sound-transmitting sac (5), so as to be suitable for the bristles (7) and the ultrasonic waves emitted by the sound-transmitting sac (5) to act on the target to be cleaned synergistically.

2. The ultrasonic brush head according to claim 1, wherein: The working frequency of the ultrasonic transducer (4) is 20KHz - 6MHz; the ultrasonic transducer (4) can emit any one or more of single-frequency, dual-frequency, and multi-frequency ultrasonic waves; When the ultrasonic transducer (4) emits single-frequency ultrasonic waves, the sound power is 0.01W - 0.2W; or When the ultrasonic transducer (4) emits dual-frequency ultrasonic waves, the sound power is 0.01W - 0.4W; or When the difference Δ between the ultrasonic waves of two frequencies generated by the ultrasonic transducer (4) satisfies the following relationship: Δ Δ ≤0.1 wherein, is the first frequency; is the second frequency; is the intermediate frequency; or When the ultrasonic transducer (4) emits multi-frequency ultrasonic waves, the sound power is 0.01W - 0.4W, and the difference Δ between the ultrasonic waves of two adjacent frequencies generated by the ultrasonic transducer (4) satisfies the following relationship: Δ Δ ≤ 0.1 wherein, is the nth frequency; is the (n + 1)th frequency; is the intermediate frequency between two adjacent frequencies.

3. The ultrasonic brush head according to claim 1, wherein: The ultrasonic transducer (4) uses piezoelectric materials, and the piezoelectric materials include any one or more combinations of piezoelectric ceramics, piezoelectric single crystals, piezoelectric polymers, and piezoelectric composites, and the number of the ultrasonic transducers (4) is at least one.

4. The ultrasonic brush head according to claim 1, wherein: The material of the sound-transmitting sac (5) is a flexible polymer material, and the flexible polymer material is any one of medical silicone, food-grade silicone, and thermoplastic polyurethane.

5. The ultrasonic brush head according to claim 1, wherein: The filling material in the sound-transmitting sac (5) uses an ultrasonic coupling agent, and the filling material contacts the ultrasonic transducer (4), so that ultrasonic waves are transmitted to the surface to be cleaned through the ultrasonic coupling agent.

6. The ultrasonic brush head according to claim 1, wherein: The bristles (7) are arranged on the outside or inside of the sound-transmitting sac (5), and the bristles (7) are arranged on the brush head body (1) through a detachable fixing structure, and the fixing structure adopts a bayonet connection structure with a snap block and a slot in cooperation; or an insertion and extraction connection structure with a groove and a rib in cooperation.

7. The ultrasonic brush head according to claim 1, wherein: The ultrasonic transducer (4) is a focused ultrasonic transducer or a non-focused ultrasonic transducer; when a focused ultrasonic transducer is adopted, the transducer is configured to focus ultrasonic energy on the area to be cleaned; when a non-focused ultrasonic transducer is adopted, the transducer is configured to diverge ultrasonic energy to cover multiple areas on the surface of the target to be cleaned.

8. An ultrasonic toothbrush made with the ultrasonic brush head according to any one of the above claims 1-7, characterized in that: It includes an ultrasonic brush head, a handle (3), a controller (10), an ultrasonic drive circuit (9), a battery (11), and a vibration motor (8); the ultrasonic brush head is connected to the handle (3), and the controller (10) and the ultrasonic drive circuit (9) are arranged in the handle (3); the controller (10) is connected to the ultrasonic drive circuit (9), and the ultrasonic drive circuit (9) is connected to the ultrasonic transducer (4) in the ultrasonic brush head.

9. The ultrasonic toothbrush according to claim 8, wherein: The ultrasonic drive circuit (9) uses a circuit that can generate any one of single-frequency, dual-frequency, and multi-frequency drive signals.

10. The ultrasonic toothbrush according to claim 8, wherein: The vibration motor (8) is arranged on the handle (3); the controller (10) is connected to the vibration motor (8), and the vibration motor (8) is connected to the ultrasonic brush head; it is used to drive the ultrasonic brush head to vibrate, and the vibration motor (8) vibrates 9,000 - 40,000 times per minute.

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