Dental treatment instrument with magnetic interface

Abstract

The utility model relates to a kind of oral cavity treatment instruments with magnetic interface, it includes operating end component and control end component, operating end component and control end component form magnetic attraction connection and conductive connection by the magnetic interface, wherein, operating end component has first shell and is installed at the end of first shell, the end surface recess of relative first shell first interface body, the first interface body is provided with first electric connection part and first magnet;Control end component has second shell and is installed at the end of second shell, the end surface protrusion of relative second shell second interface body, the second interface body is provided with the second electric connection part corresponding with first electric connection part in position and the second magnet corresponding with first magnet in position, wherein, when first magnet and second magnet form the magnetic attraction connection, first electric connection part and second electric connection part form the conductive connection.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, and in particular to an oral treatment device with a magnetic interface. Background Technology

[0002] Current dental instruments, especially large, non-disposable ones, generally employ a modular design, allowing the operating part to be removed for routine cleaning. This cleaning is typically done by rinsing with water. Therefore, electrically driven dental instruments require sealing structures designed for different interfaces.

[0003] Current modular dental instruments typically use physical plug-in interfaces for electrical connection, which generally provide good sealing when connected. However, if this interface becomes accidentally loosened due to misoperation, there is a risk of electric shock and damage to the circuitry, such as when plugging or unplugging the instrument while it is moistened with the user's saliva. Furthermore, the power-off delay of these physical plug-in interfaces is greater than or equal to 200ms, making it impossible to achieve millisecond-level physical disconnection in emergency situations. This may compromise the safety of the user and the instrument in extreme circumstances.

[0004] Magnetic connectors can achieve millisecond-level disconnection, but their waterproofing capability still does not meet the standards required for dental treatment devices. In particular, the contact impedance of existing magnetic connectors does not meet the requirements of the ISO 13485:2016 medical device safety standard. Utility Model Content

[0005] Therefore, in order to achieve better physical disconnection capability of dental instruments while ensuring their waterproof capability, this utility model proposes a dental instrument with a magnetic interface. The dental instrument includes an operating end component and a control end component. During operation, the operating end component partially extends into the oral cavity and forms a magnetic and conductive connection with the operating end component through the magnetic interface. The operating end component has a first housing and a first interface body recessed at the end of the first housing relative to the end face of the first housing. The first interface body is provided with a first electrical connection portion and a first magnet. The control end component has a second housing and a second interface body protruding at the end of the second housing relative to the end face of the second housing. The second interface body is provided with a second electrical connection portion corresponding in position to the first electrical connection portion and a second magnet corresponding in position to the first magnet. When the first magnet and the second magnet form the magnetic connection, the first electrical connection portion and the second electrical connection portion form the conductive connection.

[0006] Therefore, the first and second interface bodies of the magnetic interface are attracted together by a certain magnetic force through the first and second magnets to form a magnetic connection. At this time, the first and second electrical connection parts come into contact to form a stable conductive connection. This allows the components providing the magnetic connection and the components providing the conductive connection to be integrated into the first and second interface bodies, thereby achieving a particularly compact structure. In addition, since the end face of the first interface body is recessed relative to the end face of the first housing, and the end face of the second interface body protrudes relative to the end face of the second housing, when the first and second interface bodies are attracted together by magnetic force, their interfaces are not exposed, thus achieving good waterproof performance. Sufficient waterproof performance can prevent the interface from increasing contact resistance due to moisture, thereby meeting the contact resistance requirements of the ISO 13485:2016 medical device safety standard, making this magnetic interface a medical-grade magnetic safety interface.

[0007] Preferably, the second housing of the control terminal assembly has a cavity and a first opening leading to the cavity, and the control terminal assembly also has a bracket with a supporting portion and a closed end, wherein an electronic component is fixed on the supporting portion and extends into the cavity from the first opening, and the closed end is provided with the second interface body and closes the first opening.

[0008] Therefore, on the one hand, the supporting part of the bracket can be used to fix the electronic components inside the second housing; on the other hand, the closed end of the bracket can be used to close the second housing and fix the second interface body. This design allows for the relatively independent design of each functional component, especially by utilizing existing magnetic interfaces. Thus, without modifying the structure of the second interface body of the magnetic interface, the design can be adapted to different application scenarios of dental instruments by modifying the structure of the second housing and the bracket.

[0009] Preferably, the closed end of the bracket is provided with a second opening, and the second interface body is installed in the second opening and a sealing member is provided between the second opening and the second opening.

[0010] The second interface body can be installed in the bracket in various ways, such as by snap-fit, threaded connection, or adhesive connection. Installing the second interface body in the surrounding second opening and arranging a sealing member therein can advantageously achieve a detachable connection between the second interface body and the bracket while simultaneously meeting the sealing requirements.

[0011] Preferably, the bracket forms a stepped portion surrounding the second interface body at the closed end, the first end face of the stepped portion is substantially flush with the end face of the second housing, the second end face of the stepped portion is substantially flush with the end face of the second interface body, and the angle formed between the outer surface of the stepped portion and the first end face is in the range of 90° to 120°; the first housing has a peripheral wall surrounding the first interface body, the end face of the first electrical connection portion is recessed relative to the end face of the peripheral wall, the angle formed between the inner surface of the peripheral wall and the end face of the peripheral wall is in the range of 90° to 120°, and the angle formed between the inner surface of the peripheral wall and the end face of the peripheral wall is greater than or equal to the angle formed between the outer surface of the stepped portion and the first end face.

[0012] On the one hand, the design of the surrounding wall and the stepped portion enables the first interface body to be recessed relative to the end face of the first housing and the second interface body to protrude relative to the end face of the second housing; on the other hand, by controlling the angle between the inner surface of the surrounding wall and the end face of the surrounding wall and the angle between the outer surface of the stepped portion and the first end face of the stepped portion, a good introduction effect can be achieved when the operating end component and the control end component are engaged.

[0013] Preferably, the stepped portion is at least partially formed by an elastic member that surrounds the second interface body and forms the second end face.

[0014] Thus, the elastic member can fix the second interface body on the bracket, and when the operating end component and the control end component are not in a connected state, the second interface body is only exposed with its end face exposed.

[0015] Preferably, the second end face protrudes slightly relative to the end face of the second interface body, and / or the angle formed by the inner surface of the peripheral wall and the end face of the peripheral wall is greater than the angle formed by the outer surface of the step portion and the first end face.

[0016] Therefore, the elastic member can deform due to the magnetic attraction when the operating end component and the control end component are in a connected state, thereby forming a seal between the step portion and the first housing.

[0017] Preferably, a hydrophobic coating is applied to the opposing end faces of the first interface body and the second interface body. More preferably, the contact angle of the hydrophobic coating is greater than or equal to 120°. This prevents liquid from accumulating at the end faces and further prevents liquid from penetrating into the first and second electrical connections.

[0018] Preferably, the first interface body is further provided with a third magnet, and the second interface body is provided with a fourth magnet corresponding in position to the third magnet. The third magnet and the fourth magnet form the magnetic attraction connection, and the first magnet and the third magnet have opposite magnetic properties. This achieves a foolproof function, ensuring that the magnetic interface between the operating end component and the control end component can only be engaged in one direction. In particular, this asymmetrical magnetic pole arrangement can generate a certain repulsive force, for example, ≥0.5N, when the angular deviation exceeds 15°, thereby forcing the interface to separate. In addition, multiple magnets can provide a stronger magnetic attraction force, making the magnetic connection between the operating end component and the control end component more secure.

[0019] Preferably, one of the first interface body and the second interface body is further provided with a protrusion, the protrusion having a linear first end and an arc-shaped second end, and the other of the first interface body and the second interface body is provided with a recess that complements the protrusion. This also enables the aforementioned foolproof function.

[0020] More preferably, the first electrical connection portion and the second electrical connection portion are respectively disposed on the protrusion and the recess, wherein the first electrical connection portion disposed on the protrusion is configured as a planar contact, and the second electrical connection portion disposed on the recess is configured as a movable terminal.

[0021] On the one hand, the first electrical connection portion is recessed relative to the first housing, and its planar contacts typically offer good waterproofing. Therefore, the first electrical connection portion, under this design, possesses sufficient waterproofing performance, especially in preventing splashing when the magnetic interface is accidentally disconnected. On the other hand, placing the second electrical connection portion within the recess creates a double fluid isolation barrier, thereby providing excellent waterproofing for the typically poorly waterproofed moving terminals, particularly in preventing splashing when the magnetic interface is accidentally disconnected.

[0022] Preferably, the first housing and the first interface body are integrally injection molded. The integral injection molded structure provides excellent waterproof performance for the circuit structure within the first housing.

[0023] Preferably, the magnet in the control assembly is an electromagnet, which can provide a repulsive force in an emergency, thereby achieving faster physical disconnection. More preferably, the control assembly further includes at least one of the following sensor devices: a triaxial accelerometer, a current sensor, a voltage sensor, and a polarity detector, to identify the aforementioned emergency situation and / or determine the polarity of the electromagnet. For example, when the triaxial accelerometer detects abnormal vibration of 1.5G or greater, or when the current sensor / voltage sensor detects an instantaneous or fluctuating value of current / voltage greater than or equal to a threshold, the electromagnet triggers physical disconnection within 5ms. Attached Figure Description

[0024] To better understand the above and other objects, features, advantages, and functions of this utility model, reference can be made to the preferred embodiments shown in the accompanying drawings. The same reference numerals in the drawings refer to the same parts. Those skilled in the art should understand that the drawings are intended to schematically illustrate the preferred embodiments of this utility model and do not limit the scope of this utility model in any way; the parts in the drawings are not drawn to scale.

[0025] Figure 1 A perspective view of the operating end assembly of the oral treatment device according to the present invention is shown;

[0026] Figure 2 A perspective sectional view of the operating end assembly of the oral treatment device according to the present invention is shown;

[0027] Figure 3 A perspective view of the control terminal assembly of the oral treatment device according to the present invention is shown;

[0028] Figure 4 An exploded perspective view of the control terminal assembly of the oral treatment device according to the present invention is shown;

[0029] Figure 5 A perspective view of the bracket of the control end assembly of the oral treatment device according to the present invention is shown, wherein the elastic member of the bracket is not shown; and

[0030] Figure 6 A cross-sectional view of the control end assembly of the oral treatment device according to the present invention is shown. Detailed Implementation

[0031] Now, with reference to the accompanying drawings, specific embodiments of the present invention will be described in detail. The embodiments described herein are merely preferred embodiments of the present invention; those skilled in the art can conceive of other ways to implement the present invention based on these preferred embodiments, and such other ways also fall within the scope of the present invention.

[0032] Figures 1 to 6An oral treatment device according to a first embodiment of the present invention is shown. This oral treatment device is a tongue muscle electrostimulation device, which includes an operating end component 100 and a control end component 200. The operating end component 100 and the control end component 200 are magnetically connected and electrically connected through a magnetic interface. The magnetic connection enables the operating end component 100 and the control end component 200 to be relatively fixed in position, and the conductive connection enables the operating end component 100 to provide feedback information to the control end component 200 and / or enables the control end component 200 to provide control signals to the operating end component 100.

[0033] like Figure 1 As shown, the operating terminal assembly 100 has a first housing 110 and a first interface body 120 recessed at the end of the first housing 110 relative to the end face 112 of the first housing 110. The first interface body 120 is provided with a first electrical connection portion 122 and magnets 123 and 124 on both sides of the first electrical connection portion 122. The two magnets 123 and 124 are arranged with opposite polarities to achieve a foolproof function, ensuring that the operating terminal assembly 100 and the control terminal assembly 200 can only engage in one direction. In particular, this asymmetrical magnetic pole arrangement can generate a certain repulsive force, for example ≥0.5N, when the angular deviation exceeds 15°, thereby forcing the interface to separate.

[0034] In other embodiments, a single magnet can be used to form a magnetic connection, a ring-shaped magnet can be used, or multiple magnets, such as three magnets, can be arranged asymmetrically on both sides to form a magnetic connection. Preferably, the magnet is a permanent magnet, such as a neodymium iron boron magnet. Compared to traditional mechanical connections, magnetic connections achieved through permanent magnets do not require mechanical unlocking when disconnected, thus achieving rapid physical disconnection, for example, less than or equal to 10 ms.

[0035] Here, the first housing 110 and the first interface body 120 are integrally injection molded. The first housing 110 is preferably made of an insulating material. The portion of the first housing 110 that extends into the oral cavity is also provided with an electrode terminal 140, which is electrically connected to the first electrical connection portion 122 of the first interface body 120 via a wire (not shown) inside the first housing 110, thereby allowing the electrical stimulation signal to be conducted from the control terminal assembly 200 to the electrode terminal 140 through the conductive connection. The first housing 110 can be integrally injection molded with the first interface body 120, the electrode terminal 140, and the wire in the same process. This integral injection molding structure provides particularly excellent waterproof and dustproof properties for the internal wiring. The insulating material can be, for example, medical rubber or medical resin, to provide better biocompatibility.

[0036] The end face 112 of the first housing 110 protrudes around the first interface body 120, thereby forming a peripheral wall 115 surrounding the first interface body. The peripheral wall 115 has an inner surface 116, which preferably forms an angle α of 90° to 120° with the end face 112 (see [reference]). Figure 2 The inner surface 116 terminates at the bottom surface 118 of the first housing 110 at this end.

[0037] The first interface body 120 has an end face 125 that is substantially flush with the bottom surface 118 of the first housing 110, such that when the operating end assembly 100 and the control end assembly 200 are not connected, the first interface body 120 is exposed only by its end face 125. In this document, "substantially flush" means that the height difference between the planes containing the two faces is within ±0.1 mm. Where one face protrudes 0-1 mm relative to the other face, it can also be said that the first face "slightly protrudes" relative to the second face. This dimensional setting not only provides a relatively loose tolerance range but also enables a good seal under certain structures, which will be described in more detail below.

[0038] The end face 125 of the first interface body 120 has a protrusion 126 at the middle, which has a linear first end 126a and an arc-shaped second end 126b. The asymmetrical ends also give the protrusion 126 a foolproof function.

[0039] In this embodiment, the first electrical connection portion 122 is disposed on the protrusion 126 and is configured as a planar contact. The end face of the first electrical connection portion 122 is substantially flush with the end face of the protrusion 126 and is recessed relative to the end face 112 of the peripheral wall 115. Due to the recessed design of the first electrical connection portion 122 relative to the peripheral wall 115, when the magnetic interface is accidentally released, the ejected liquid is less likely to splash onto the first electrical connection portion 122. Furthermore, the planar contact structure of the first electrical connection portion 122 provides excellent sealing performance.

[0040] like Figure 2 As shown, the first interface body 120 also has a protruding ring 129 extending parallel to its end face 122 in the part enclosed by the first housing 110. The protruding ring 129 facilitates the firm connection between the first interface body 120 and the first housing 110, making it difficult for the first interface body 120 to detach from the first housing 110.

[0041] like Figure 3As shown, the control terminal assembly 200 has a second housing 210 and a second interface body 220 mounted at the end of the second housing 210 and protruding relative to the end face 212 of the second housing 210. The second interface body 220 is provided with a second electrical connection portion 222 corresponding in position to the first electrical connection portion 122 and magnets 223 and 224 corresponding in position to magnets 123 and 124. The magnets corresponding in position have opposite magnetic properties, thereby forming a magnetic attraction connection, causing the first electrical connection portion 122 and the second electrical connection portion 222 to be firmly attracted together and make contact to form a conductive connection. Preferably, the magnets are permanent magnets, such as neodymium iron boron magnets.

[0042] In another embodiment, the magnet in the control assembly can be designed as an electromagnet. Thus, the polarity of the magnet can be set as needed to provide magnetic attraction or repulsion. For example, when the control assembly is activated, the electromagnet provides magnetic attraction; in an emergency, such as a malfunction of the dental treatment device, the electromagnet provides repulsion to disconnect the conductive connection, thereby achieving a faster physical disconnection than a permanent magnet, for example, less than or equal to 5 ms. Such emergency situations can be identified by various sensor devices, such as a triaxial accelerometer, voltage sensor, current sensor, etc. The polarity of the electromagnet can be determined by detecting the polarity of magnets 123 and 124 in the operating assembly 100 using a polarity detector.

[0043] For example, when a triaxial accelerometer detects abnormal vibrations of 2G or greater, the electromagnet can quickly disconnect the magnetic interface within a predetermined time, such as 5ms, thereby triggering a power-off protection. Furthermore, monitoring the stimulation voltage and / or current and the corresponding rapid disconnection can also protect the user from injury caused by excessive voltage / current stimulation.

[0044] The second interface body 220 also has a recessed portion 226 at the center of its end face 225, which is complementary to the protrusion 126 of the first interface body 120. Therefore, the recessed portion 226 also has a linear first end 226a and an arc-shaped second end 226b.

[0045] Due to the corresponding design, the second electrical connection 222 is arranged in the recess 226 and is configured as a movable terminal, such as a so-called POGO PIN. Due to the recessed design of the second electrical connection 222 relative to the end face 225 of the second interface body 220, when the magnetic interface is accidentally released, the liquid that is thrown out is less likely to splash onto the second electrical connection 222.

[0046] See Figure 4The second housing 210 has a cavity 215 and a first opening 216 leading to the cavity 215. The control end assembly 200 also has a bracket 230, on which the second interface body 220 is first mounted, and then partially inserted into the cavity 215 together with the bracket 230 through the first opening 216. The bracket 230 can be connected to the second housing 210 by means of material bonding, such as by adhesive or heat fusion, to form a strong and sealed connection.

[0047] Combination Figure 5 and Figure 6 As can be further seen, the bracket 230 has a support portion 231 and a closed end 232 located at one end of the support portion 231. The support portion 231 is provided with positioning members, such as mounting holes 237 and positioning posts 239, for fixing electronic components, such as a power supply 250 and a control circuit board 260. During installation, the support portion 231 extends into the cavity 215 from the first opening 216 until the closed end 232 closes the first opening 216. Here, the closed end 232 is provided with a second opening 233, and the second interface body 220 is installed in the second opening 233, with a sealing member 240 provided between the second opening 233 and the second interface body 220. The sealing member 240 can be a rubber sealing ring. The sealing member 240 prevents liquid from entering the interior of the second housing 210 through the gap between the second opening 233 of the closed end 232 and the second interface body 220.

[0048] Reference Figure 6 In particular, it can be seen that the internal pins 227 of the second electrical connection portion 222 are bent within the cavity 215 of the second housing 210. The internal pins 227 can pass through the control circuit board 260 and be electrically connected to the control circuit board 260, for example, by soldering.

[0049] Now back Figure 3 It can also be seen that the bracket 230 forms a stepped portion surrounding the second interface body 220 at the closed end 232. The first end face 234 of this stepped portion is substantially flush with the end face 212 of the second housing 210, and the second end face 235 of this stepped portion is substantially flush with the end face 225 of the second interface body 220, so that when the operating end assembly 100 and the control end assembly 200 are not in a connected state, the second interface body 220 is only exposed with its end face 225. The angle β formed between the outer surface 236 of this stepped portion and the first end face 234 (see...) Figure 6 The included angle is in the range of 90° to 120°. In this embodiment, the included angle α (see...) Figure 2 The angle β is equal to and greater than 90°, thereby providing guidance for the magnetic connection between the operating end assembly 100 and the control end assembly 200, enabling the two to engage particularly smoothly.

[0050] See you again Figure 4 and Figure 6 The bracket 230 also has an elastic member 238 at the closed end 232, which at least partially forms a stepped portion of the bracket 230. Here, the elastic member 238 is arranged around the second interface body 220, particularly the protruding ring 229 surrounding the second interface body 220, and forms a second end face 235 of the stepped portion. The elastic member 238 can be connected to the closed end 232 by material bonding, for example by adhesive, thereby forming a sealed connection between the elastic member 238 and the closed end 232. On the one hand, the elastic member 238 can be used to fix the second interface body 220 to the bracket 230; on the other hand, in some cases, the elastic member 238 can provide a certain degree of sealing after a magnetic connection is formed between the operating end assembly 100 and the control end assembly 200.

[0051] In one embodiment, the second end face 235 formed by the elastic member 238 may protrude slightly relative to the end face 225 of the second interface body 220, so that after the operation end assembly 100 and the control end assembly 200 form a magnetic connection, the elastic member 238 is squeezed and deformed at the end face 232, especially expanding outward, thereby forming a sealed connection between the inner surface 116 of the peripheral wall 115 and the outer surface 236 of the step portion formed by the elastic member 238.

[0052] In another embodiment, the included angle α (see Figure 2 It can be constructed to be greater than the included angle β (see...) Figure 6 After the operation terminal assembly 100 and the control terminal assembly 200 form a magnetic connection, the elastic member 238 is compressed and deformed on the outer surface 236, especially extending longitudinally, thereby forming a sealed connection between the end face 235 of the elastic member 238 and the bottom surface 118 of the first housing 110.

[0053] In addition, a hydrophobic coating can be applied to the opposite end faces 125 and 225 of the first interface body 120 and the second interface body 220. The contact angle of the hydrophobic coating is preferably greater than or equal to 120°, thereby preventing liquid from accumulating at the end faces 125 and 225, and further preventing liquid from entering the first electrical connection portion 122 and the second electrical connection portion 222 located in the middle of the end faces 125 and 225, respectively.

[0054] The above description of various embodiments of this utility model is provided for the purpose of description to a person of ordinary skill in the art. It is not intended to exclude or limit the utility model to a single disclosed embodiment. As stated above, a person of ordinary skill in the art will understand that various alternatives and variations of this utility model exist. Therefore, although some alternative embodiments have been specifically described, a person of ordinary skill in the art will understand or relatively easily develop other embodiments. This utility model is intended to include all alternatives, modifications, and variations of the utility model described herein, as well as other embodiments falling within the spirit and scope of the utility model described above.

[0055] List of reference numerals

[0056] 100 operator terminal components

[0057] 110 First Shell

[0058] 112 End face of the first housing

[0059] 115 Zhoubi

[0060] 116 inner surface

[0061] 118 bottom

[0062] 120 First Interface Body

[0063] 122 First Electrical Connection Part

[0064] 123 Magnets

[0065] 124 magnets

[0066] 125 End face of the first interface body

[0067] 126 protrusions

[0068] 125a The first end of the protrusion

[0069] 126b The second end of the protrusion

[0070] 129 raised ring

[0071] 140 electrode terminals

[0072] 200 control terminal components

[0073] 210 Second Shell

[0074] 215 cavity

[0075] 216 First Opening

[0076] 220 Second Interface Body

[0077] 222 Second Electrical Connection

[0078] 223 magnet

[0079] 224 magnets

[0080] 225 End face of the second interface body

[0081] 226 Depression

[0082] 226a First end of the recess

[0083] 226b The second end of the recess

[0084] 227 internal pins

[0085] 229 raised ring

[0086] 230 bracket

[0087] 231 Supporting Department

[0088] 232 closed end

[0089] 233 Second opening

[0090] 234 First end face

[0091] 235 Second End Face

[0092] 236 outer surface

[0093] 237 mounting holes

[0094] 238 Elastic Components

[0095] 239 positioning post

[0096] 240 sealing components

[0097] α Angle

[0098] β angle

Claims

1. A dental treatment device with a magnetic interface, the dental treatment device comprising an operating end component and a control end component, wherein the operating end component and the control end component are magnetically and electrically connected via the magnetic interface, characterized in that, The operating terminal assembly has a first housing and a first interface body recessed at the end of the first housing relative to the end face of the first housing. The first interface body is provided with a first electrical connection portion and a first magnet. The control terminal assembly has a second housing and a second interface body protruding at the end of the second housing relative to the end face of the second housing. The second interface body is provided with a second electrical connection portion corresponding to the first electrical connection portion in position and a second magnet corresponding to the first magnet in position. When the first magnet and the second magnet form the magnetic attraction connection, the first electrical connection portion and the second electrical connection portion form the conductive connection.

2. The oral treatment device according to claim 1, characterized in that, The second housing of the control terminal assembly has a cavity and a first opening leading to the cavity, and the control terminal assembly also has a bracket with a supporting portion and a closed end, wherein an electronic component is fixed on the supporting portion and extends into the cavity from the first opening, and the closed end has a second interface body and closes the first opening.

3. The oral treatment device according to claim 2, characterized in that, The closed end of the bracket is provided with a second opening, and the second interface body is installed in the second opening and a sealing member is provided between the second opening and the second opening.

4. The oral treatment device according to claim 3, characterized in that, The bracket forms a stepped portion surrounding the second interface body at the closed end. The first end face of the stepped portion is substantially flush with the end face of the second housing, and the second end face of the stepped portion is substantially flush with the end face of the second interface body. The angle formed between the outer surface of the stepped portion and the first end face is in the range of 90° to 120°. The first housing has a peripheral wall surrounding the first interface body. The end face of the first electrical connection portion is recessed relative to the end face of the peripheral wall. The angle formed between the inner surface of the peripheral wall and the end face of the peripheral wall is in the range of 90° to 120°, and the angle formed between the inner surface of the peripheral wall and the end face of the peripheral wall is greater than or equal to the angle formed between the outer surface of the stepped portion and the first end face.

5. The oral treatment device according to claim 4, characterized in that, The stepped portion is at least partially formed by an elastic member that surrounds the second interface body and forms the second end face.

6. The oral treatment device according to claim 5, characterized in that, The second end face protrudes slightly relative to the end face of the second interface body, and / or The angle formed between the inner surface of the peripheral wall and the end face of the peripheral wall is greater than the angle formed between the outer surface of the step and the first end face.

7. The oral treatment device according to any one of the preceding claims, characterized in that, The opposite end faces of the first interface body and the second interface body are coated with a hydrophobic coating.

8. The oral treatment device according to claim 7, characterized in that, The contact angle of the hydrophobic coating is greater than or equal to 120°.

9. The oral treatment device according to claim 1, characterized in that, The first interface body is further provided with a third magnet, and the second interface body is provided with a fourth magnet that corresponds to the third magnet in position. The third magnet and the fourth magnet form the magnetic attraction connection, and the first magnet and the third magnet have opposite magnetic properties.

10. The oral treatment device according to claim 1, characterized in that, One of the first interface body and the second interface body is further provided with a protrusion, the protrusion having a linear first end and an arc-shaped second end, and the other of the first interface body and the second interface body is provided with a recess that is complementary to the protrusion.

11. The oral treatment device according to claim 10, characterized in that, The first electrical connection portion and the second electrical connection portion are respectively disposed on the protrusion portion and the recessed portion, wherein the first electrical connection portion disposed on the protrusion portion is configured as a planar contact, and the second electrical connection portion disposed on the recessed portion is configured as a movable terminal.

12. The oral treatment device according to claim 1, characterized in that, The first housing and the first interface body are integrally injection molded.

13. The oral treatment device according to claim 1, characterized in that, The magnet in the control unit is an electromagnet, which can provide a repulsive force in an emergency.

14. The oral treatment device according to claim 13, characterized in that, The control terminal assembly also includes at least one of the following sensor devices: a triaxial accelerometer, a current sensor, a voltage sensor, and a polarity detector.

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