Waterpik and control method thereof

Abstract

The application discloses a water pick and a control method thereof, and relates to the technical field of water picks.In the control method of the water pick, the water pump driving current and the spatial posture data of the water pick in a working state are acquired first; then the relative distance between the nozzle and the tooth surface is determined according to the water pump driving current, and the inclination angle of the nozzle relative to the tooth surface is determined according to the spatial posture data; and finally, the first type of prompt information is output by the user interaction module according to the relative distance, and / or the second type of prompt information is output by the user interaction module according to the inclination angle.The application aims to reduce the oral health risks caused by improper operation and improve the cleaning efficiency and safety of the water pick.

Description

Technical Field

[0001] This invention relates to the field of oral irrigator technology, and more particularly to an oral irrigator and its control method. Background Technology

[0002] With increasing awareness of oral health, water flossers have become widely used in daily home care as an oral hygiene aid. Driven by a water pump, they generate high-pressure pulsed water flow, effectively removing food debris and plaque from areas difficult to reach with toothbrushes, such as between teeth, in the gingival sulcus, and between orthodontic brackets. They offer advantages such as high cleaning efficiency and ease of use. However, users may make numerous operational errors due to a lack of professional guidance, leading to poor cleaning results and potentially damaging gum tissue. For example, water flossers lack real-time sensing and intelligent guidance mechanisms for user behavior. When users use them improperly or incorrectly for extended periods, the cleaning effect cannot be guaranteed, and oral health may even be compromised. Summary of the Invention

[0003] The main objective of this invention is to provide a water flosser and its control method, which aims to reduce oral health risks caused by improper operation and improve the cleaning efficiency and safety of the water flosser.

[0004] To achieve the above objectives, the present invention proposes a control method for a dental flosser, the dental flosser comprising a nozzle, a water pump, and a user interaction module, the control method comprising: Acquire the water pump drive current and spatial attitude data of the water flosser during operation; The relative distance between the nozzle and the tooth surface is determined based on the water pump drive current, and the tilt angle of the nozzle relative to the tooth surface is determined based on the spatial posture data. The user interaction module is controlled to output a first type of prompt information based on the relative distance, and / or, the user interaction module is controlled to output a second type of prompt information based on the tilt angle.

[0005] In one embodiment, determining the relative distance between the nozzle and the tooth surface based on the water pump drive current includes: If the pump drive current is greater than or equal to a preset first current threshold, it is determined that the relative distance is less than or equal to a preset first distance. If the pump drive current is less than or equal to a preset second current threshold, it is determined that the relative distance is greater than or equal to a preset second distance. If the pump drive current is greater than a preset second current threshold and less than a preset first current threshold, then the relative distance is determined to be greater than a preset first distance and less than a preset second distance. Wherein, the preset first current threshold is greater than the preset second current threshold, and the preset second distance is greater than the preset first distance.

[0006] In one embodiment, controlling the user interaction module to output a first type of prompt information based on the relative distance includes: If the relative distance is less than or equal to a preset first distance, the user interaction module is controlled to output a close-range warning message; When the relative distance is greater than or equal to a preset second distance, the user interaction module is controlled to output a long-distance prompt message; When the relative distance is greater than a preset first distance and less than a preset second distance, the user interaction module is controlled to output valid cleaning confirmation information.

[0007] In one embodiment, controlling the user interaction module to output the second type of prompt information based on the tilt angle includes: When the tilt angle is less than or equal to a preset first angle, the user interaction module is controlled to output an abnormal posture warning message. When the tilt angle is greater than or equal to a preset second angle, the user interaction module is controlled to output a verticality correction prompt message. When the tilt angle is greater than a preset first angle and less than a preset second angle, the user interaction module is controlled to output valid cleaning confirmation information. The tilt angle is the angle between the nozzle and the tooth surface, the preset second angle is greater than the preset first angle, and the preset second angle is equal to 90 degrees.

[0008] In one embodiment, the first type of prompt information is used to prompt an increase or decrease in the relative distance between the nozzle and the tooth surface; the second type of prompt information is used to prompt an increase or decrease in the angle between the nozzle and the tooth surface.

[0009] In one embodiment, after acquiring the water pump drive current and spatial attitude data of the oral irrigator in its working state, the control method of the oral irrigator further includes: The cleaning area of ​​the water flosser is determined based on the spatial posture data, and the duration of a single continuous rinsing of the cleaning area is recorded. When the duration of a single continuous rinse reaches the recommended cleaning time for the corresponding cleaning area, the user interaction module is controlled to output a movement prompt signal to prompt the user to switch cleaning areas.

[0010] In one embodiment, controlling the user interaction module to output a first type of prompt information based on the relative distance includes: controlling the user interaction module to output the first type of prompt information based on the relationship between the relative distance and a preset cleaning distance threshold; the method for controlling the water flosser further includes: Determine the operating mode of the oral irrigator, which includes standard mode, gentle mode, and pulse mode; Based on the working mode, determine the preset cleaning distance threshold corresponding to the working mode; The preset cleaning distance threshold corresponding to the pulse mode is greater than the preset cleaning distance threshold corresponding to the standard mode, and the preset cleaning distance threshold corresponding to the standard mode is greater than the preset cleaning distance threshold corresponding to the gentle mode.

[0011] The present invention also proposes a water flosser, the water flosser including a control device, the control device including: a memory, a processor and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the control method of the water flosser described above.

[0012] In one embodiment, the water flosser further includes a user interaction module, and the control device is electrically connected to the user interaction module. The control device is used to control the user interaction module to output either a first type of prompt information or a second type of prompt information.

[0013] In one embodiment, the user interaction module includes any one or more combinations of a display module, an audio prompt module, a haptic feedback module, and a communication module.

[0014] In practical applications, a monitoring system was built by leveraging the negative correlation between the pump drive current and the nozzle-tooth distance, as well as the correspondence between spatial posture data and nozzle tilt angle. This system monitors the user's rinsing behavior, allowing the water flosser to determine in real time whether the rinsing area is within the effective cleaning zone and triggering the user interaction module to output targeted prompts. This real-time, intuitive closed-loop feedback mechanism effectively corrects users' poor operating habits, reduces oral health risks caused by improper operation, and improves the cleaning efficiency and safety of the water flosser. Furthermore, by outputting prompts, the system not only corrects user behavior in time when errors occur but also provides positive encouragement when correct operations are performed, fostering a sense of accomplishment and helping users maintain long-term oral care habits. Attached Figure Description

[0015] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A flowchart illustrating an embodiment of the control method for the oral irrigator of the present invention; Figure 2 A flowchart illustrating another embodiment of the control method for the oral irrigator of the present invention; Figure 3 A flowchart illustrating another embodiment of the control method for the oral irrigator of the present invention; Figure 4 A flowchart is provided for yet another embodiment of the control method for the oral irrigator of the present invention; Figure 5 A flowchart illustrating another embodiment of the control method for the oral irrigator of the present invention; Figure 6 This is a flowchart illustrating another embodiment of the control method for the oral irrigator of the present invention.

[0018] The objectives, features, and advantages of this invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0019] It should be understood that the specific embodiments described herein are merely illustrative of the technical solutions of the present invention and are not intended to limit the present invention.

[0020] To better understand the technical solution of the present invention, a detailed description will be provided below in conjunction with the accompanying drawings and specific embodiments.

[0021] With increasing awareness of oral health, water flossers have become widely used in daily home care as an oral hygiene aid. Driven by a water pump, they generate high-pressure pulsed water flow, effectively removing food debris and plaque from areas difficult to reach with toothbrushes, such as between teeth, in the gingival sulcus, and between orthodontic brackets. They offer advantages such as high cleaning efficiency and ease of use. However, users may make numerous operational errors due to a lack of professional guidance, leading to poor cleaning results and potentially damaging gum tissue. For example, water flossers lack real-time sensing and intelligent guidance mechanisms for user behavior. When users use them improperly or incorrectly for extended periods, the cleaning effect cannot be guaranteed, and oral health may even be compromised.

[0022] Therefore, refer to Figure 1 This invention proposes a control method for a dental flosser, the dental flosser comprising a nozzle, a water pump, and a user interaction module, the control method comprising: Step S100: Obtain the water pump drive current and spatial attitude data of the water flosser in working condition; Step S200: Determine the relative distance between the nozzle and the tooth surface based on the water pump drive current, and determine the tilt angle of the nozzle relative to the tooth surface based on the spatial posture data. Step S300: Control the user interaction module to output a first type of prompt information according to the relative distance, and / or control the user interaction module to output a second type of prompt information according to the tilt angle.

[0023] In this embodiment, the control method for the oral irrigator of the present invention can be applied to a control device for the oral irrigator. The control device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. The computer program is configured to implement the steps of the control method for the oral irrigator. The control device can be implemented using a main controller, such as an MCU, DSP (Digital Signal Processor), FPGA (Field Programmable Gate Array), PLC, or SOC (System on Chip).

[0024] In this embodiment, the oral irrigator includes, but is not limited to, nozzles, a water pump, a user interaction module, and a control device. The nozzle, as the final actuator for water output, guides the high-pressure pulsed water flow generated by the water pump to a specific location in the oral cavity, ensuring the water flow acts on the target area. The water pump, as the power core, can drive a piston or diaphragm via a motor to pressurize the liquid in the water tank of the oral irrigator, generating a high-pressure pulsed water column. The magnitude of the water pump's drive current directly reflects the load during water output and is a key physical quantity for determining the relative distance between the nozzle and the teeth. The user interaction module, as the interface for human-computer interaction, can be implemented individually by various feedback modules such as visual, auditory, and tactile feedback, or composed of at least two of these feedback modules. The user interaction module does not directly participate in the generation and control of the water flow but independently receives instructions from the control device to provide the user with feedback prompts, operation guidance, and other information.

[0025] In this embodiment, a current detection module can be used to detect the water pump drive current in real time. Simultaneously, an inertial measurement unit (IMU) installed inside the device body can be used to collect spatial attitude data. The water pump drive current reflects changes in fluid impedance, while the spatial attitude data reflects the spatial orientation of the water flosser.

[0026] It should be noted that the control device can use a preset current algorithm (such as an algorithm based on a fluid dynamics model) to analyze the pump drive current and determine the relative distance between the nozzle and the tooth surface. The relative distance is negatively correlated with the pump drive current; when the nozzle is close to the tooth surface, water flow is obstructed, leading to increased back pressure and a larger drive current; conversely, when the nozzle is far from the tooth surface, back pressure decreases, and the drive current decreases. For spatial attitude data, the control device can calculate the nozzle's tilt angle relative to the tooth surface using a preset attitude calculation algorithm (such as complementary filtering or Kalman filtering). In this embodiment, both the preset current algorithm and the preset attitude calculation algorithm can be pre-stored by the developers in the control device's internal or external memory. This transforms the raw data into an understandable operational state, enabling a quantitative assessment of the user's operational compliance.

[0027] In this embodiment, the control device can control the user interaction module to output corresponding prompt information based on at least one of the determined relative distance and tilt angle. For example, when the relative distance is determined to be too close (outside the preset effective distance range), the LED indicator of the water flosser turns red (first type of prompt information); when the tilt angle is too large (outside the preset effective angle range), the vibration motor is activated to emit vibrations at a specific frequency (second type of prompt information). Real-time correction through an independent interaction channel allows the user to receive feedback on whether the current rinsing area is within the "effective cleaning zone," and can also guide the user to adjust the current rinsing operation, ensuring cleaning efficiency and reducing gum damage caused by improper operation, thereby improving user experience and oral health. In addition, when the relative distance is within the preset effective distance range, or the tilt angle is within the preset effective angle range, the control device can also control the user interaction module to output corresponding prompt information as a positive feedback, encouraging the user to maintain the correct operation.

[0028] Optionally, the tilt angle can be the angle between the central axis of the water jet from the nozzle and the normal to the tooth surface (i.e., the line perpendicular to the tooth surface). A tilt angle of 0° indicates that the nozzle is completely perpendicular to the tooth surface (the water jet directly enters the gap between the teeth). A tilt angle greater than 0° indicates that the nozzle is tilted; the larger the angle, the further the deviation. Optionally, the tilt angle can be the angle between the central axis of the water jet from the nozzle and the tangential plane of the tooth surface (i.e., the tooth surface itself). 90° indicates perpendicular incidence. 0° indicates parallel to the tooth surface (completely inaccessible). Optionally, the tilt angle can be the tilt angle of the nozzle in the vertical plane (i.e., whether the user is "rinsing from top to bottom" or "rinsing from bottom to top"), used to distinguish between cleaning the upper and lower teeth. For example, when cleaning the upper teeth, the nozzle should tilt downwards; when cleaning the lower teeth, the nozzle should tilt upwards. Therefore, the specific meaning of the tilt angle can be set by the developers and the corresponding control algorithm can be pre-stored in memory.

[0029] In practical applications, a monitoring system was built by leveraging the negative correlation between the pump drive current and the nozzle-tooth distance, as well as the correspondence between spatial posture data and nozzle tilt angle. This system monitors the user's rinsing behavior, allowing the water flosser to determine in real time whether the rinsing area is within the effective cleaning zone and triggering the user interaction module to output targeted prompts. This real-time, intuitive closed-loop feedback mechanism effectively corrects users' poor operating habits, reduces oral health risks caused by improper operation, and improves the cleaning efficiency and safety of the water flosser. Furthermore, by outputting prompts, the system not only corrects user behavior in time when errors occur but also provides positive encouragement when correct operations are performed, fostering a sense of accomplishment and helping users maintain long-term oral care habits.

[0030] In another embodiment, reference Figure 2 The step of determining the relative distance between the nozzle and the tooth surface based on the water pump drive current includes: Step S210: If the pump drive current is greater than or equal to a preset first current threshold, determine that the relative distance is less than or equal to a preset first distance; Step S220: If the pump drive current is less than or equal to a preset second current threshold, determine that the relative distance is greater than or equal to a preset second distance; Step S230: When the water pump drive current is greater than a preset second current threshold and less than a preset first current threshold, determine that the relative distance is greater than a preset first distance and less than a preset second distance. Wherein, the preset first current threshold is greater than the preset second current threshold, and the preset second distance is greater than the preset first distance.

[0031] In this embodiment, the preset first current threshold corresponds to the current value of the "minimum safe distance," which can be calibrated by researchers through experiments and represents the maximum allowable load current. The preset first distance is the minimum allowable distance (e.g., 1mm). When the relative distance is less than the preset first distance, it is considered that the operation is too close. The preset second current threshold corresponds to the current value of the "maximum effective rinsing distance," which is numerically less than the first current threshold. The preset second distance is the maximum effective cleaning distance (e.g., 15mm). When the relative distance is greater than or equal to the preset second distance, it is considered that the operation is too far. The preset first current threshold, preset second current threshold, preset first distance, and preset second distance can all be set by researchers and stored in the memory of the control device.

[0032] When the control device determines that the water pump drive current is greater than or equal to a preset first current threshold based on the water pump drive current, it can determine that the water flow is subject to extremely high resistance (high back pressure), thus inferring that the nozzle is too close to the teeth, or even stuck. This identifies a dangerous situation and mitigates the risk of gum bleeding or discomfort caused by the nozzle being too close to the gums, preventing water flow from spreading. When the detected real-time water pump drive current is less than a preset second current threshold, the control device determines that the water flow is almost unobstructed (extremely low back pressure), inferring that the nozzle is too far from the teeth. This identifies an ineffective rinsing state, preventing the water flow from diffusing and the impact force from weakening due to excessive distance, thus failing to effectively remove plaque. When the current value is between the aforementioned preset first and second current thresholds, the control device determines that the nozzle is in the ideal rinsing position. Using a fluid dynamics model, it finds a distance that ensures both impact force and the formation of vortices to carry away dirt.

[0033] refer to Figure 3 The step of controlling the user interaction module to output the first type of prompt information based on the relative distance includes: Step S310: When the relative distance is less than or equal to a preset first distance, control the user interaction module to output a close-range warning message; Step S320: When the relative distance is greater than or equal to a preset second distance, control the user interaction module to output a long-distance prompt message; Step S330: When the relative distance is greater than a preset first distance and less than a preset second distance, control the user interaction module to output valid cleaning confirmation information.

[0034] In this embodiment, the proximity warning message indicates that the current rinsing operation poses a risk of damaging the oral soft tissues and must be adjusted immediately. The distance between the nozzle and the tooth surface is less than or equal to a preset first distance (e.g., less than 2mm). At this distance, the nozzle is almost touching the teeth or gums. This close proximity prevents the water flow from forming an effective diffusion vortex, causing the high-pressure water jet to directly and vertically impact the gingival sulcus, resulting in extremely high back pressure (corresponding to extremely high current), which can easily lead to gingival bleeding, gingival recession, or enamel abrasion. Therefore, the control device can control the user interaction module to output a proximity warning message to the user, such as through a red light or a rapid alarm sound, prompting the user to pull the nozzle back and move away from the danger zone.

[0035] In this embodiment, the long-distance warning message indicates that while the current rinsing operation is safe, its cleaning efficiency is extremely low, essentially "doing useless work." When the distance between the nozzle and the tooth surface is greater than or equal to a preset second distance (e.g., greater than 15mm), the nozzle may be suspended in the center of the oral cavity. The kinetic energy of the water column decreases, and the water column disperses in the air. By the time it reaches the tooth surface, the pressure is insufficient to remove stubborn plaque or food debris (corresponding to a very small current). Therefore, the user may only wet the oral cavity but not truly clean the deep spaces between the teeth. The control device can control the user interaction module to output a long-distance warning message to the user, such as through a blue light or a specific prompt sound, guiding the user to bring the nozzle closer to the effective range.

[0036] In this embodiment, effective cleaning confirmation information signifies that the user's current operation is standard and efficient, thus providing affirmation and encouragement. When the distance between the nozzle and the tooth surface is between a preset first distance and a preset second distance, it falls within the "effective cleaning range." At this distance, the high-pressure pulsed water flow maintains sufficient impact force to penetrate the gaps between teeth while utilizing fluid dynamics to create micro-explosions and eddies, "rolling" out dirt without damaging the gums (corresponding to a current within the normal range between a preset second current threshold and a preset first current threshold). At this point, cleaning efficiency is high, and the user experience is good. A green light or pleasant sound effect can be used to tell the user to "keep the current operation." This positive feedback helps users build muscle memory, letting them know they are "doing it right," stimulating their interest in using the water flosser, and ultimately cultivating good cleaning habits.

[0037] By monitoring the relative distance between the nozzle and the tooth surface in real time and outputting differentiated prompts based on different distance ranges, the system achieves refined guidance and closed-loop control of the rinsing process. When the relative distance is less than or equal to a preset first distance, it identifies a high-risk state where the high-pressure water jet directly impacts the gums and promptly outputs a close-range warning message, effectively avoiding gum bleeding, soft tissue damage, or enamel abrasion caused by operating too close, significantly improving user safety. When the relative distance is greater than or equal to a preset second distance, it identifies a state of reduced water flow energy and insufficient cleaning power, outputting a long-range prompt message to guide the user to adjust the angle and distance, solving the problem of low cleaning efficiency and "ineffective rinsing" caused by excessive distance. When the relative distance is within the effective cleaning range between the two, it outputs an effective cleaning confirmation message, giving the user positive feedback and helping the user quickly establish the correct operating muscle memory.

[0038] Thus, the distance-aware dynamic interaction mechanism not only improves the problems of "inadequate cleaning" or "violent tooth damage" caused by traditional water flossers due to users operating them by feeling, but also reduces the learning cost for users through visual feedback, thereby improving plaque removal rate and oral cleaning effect while ensuring the safety of oral soft tissues.

[0039] In one embodiment, reference Figure 4 The step of controlling the user interaction module to output the second type of prompt information based on the tilt angle includes: Step S340: When the tilt angle is less than or equal to a preset first angle, control the user interaction module to output an abnormal posture warning message; Step S350: When the tilt angle is greater than or equal to a preset second angle, control the user interaction module to output verticality correction prompt information; Step S360: When the tilt angle is greater than a preset first angle and less than a preset second angle, control the user interaction module to output valid cleaning confirmation information. The tilt angle is the angle between the nozzle and the tooth surface, the preset second angle is greater than the preset first angle, and the preset second angle is equal to 90 degrees.

[0040] In this embodiment, the tilt angle refers to the angle between the center line of the water flow (or the nozzle axis) and the tangential plane of the tooth surface. When the nozzle sweeps horizontally along the tooth surface, the angle is close to 0°; when the nozzle is perpendicular to the tooth surface, the angle is close to 90°. The preset first angle is the minimum angle threshold for effective cleaning. The preset second angle is the maximum angle threshold for effective cleaning. In this embodiment, both the preset first angle and the preset second angle can be preset by the researchers and stored in the memory. For example, the preset first angle can be set to 30° or 45°. The preset second angle can be set to 90°. It is understood that in physics, when a fluid impacts a solid or soft tissue surface perpendicularly (at a 90-degree angle), its rate of change of momentum is the greatest, and the impact force (back pressure) is the strongest. The gums are soft tissue and very fragile. If the water flow impacts the gingival sulcus at a 90-degree angle, the high-pressure water flow will directly "chise" the gingival papilla, causing pain and bleeding. Therefore, the preset second angle is limited to 90 degrees as the upper limit.

[0041] In this embodiment, when the tilt angle is less than or equal to a preset first angle, the nozzle is determined to be too "flat" or "sideways". At this time, the user interaction module (such as a screen or indicator light) outputs an abnormal posture warning message (e.g., a flashing yellow light or a voice prompt "Please increase the angle"). When the angle is too small, the water flow almost slides parallel to the tooth surface, failing to generate sufficient lateral pressure to enter the gaps between teeth, and failing to effectively flush away dirt in the gingival sulcus. Therefore, the abnormal posture warning message reminds the user to increase the angle, allowing the water flow to "cut into" the cleaning area. When the tilt angle is greater than or equal to a preset second angle, the nozzle is determined to be too "perpendicular" to the tooth surface. At this time, a verticality correction prompt message is output (e.g., a blue light or a voice prompt "The angle is too straight, please tilt"), thereby reducing the risk of "hard damage". That is, when the water flow impacts the gums or gaps between teeth vertically, the kinetic energy of the water column will be entirely converted into vertical pressure (back pressure) on the soft tissue, which can easily lead to gum pain, bleeding, or even recession. Therefore, the verticality correction prompt message guides the user to reduce the angle, allowing the water flow to enter tangentially or obliquely, utilizing fluid dynamics rather than brute force for cleaning. When the tilt angle is between a preset first angle and a preset second angle (e.g., 30° < tilt angle < 90°), the current posture is determined to be an "effective cleaning angle," and a valid cleaning confirmation message is output (e.g., a solid green light or a pleasant sound). Within this range, the water flow maintains sufficient impact force to enter the gaps between teeth while effectively creating a vortex to remove dirt, thus avoiding damage from vertical impact. This provides positive feedback, letting the user know that "the current operation is correct," thereby encouraging them to maintain the action.

[0042] By monitoring the tilt angle between the nozzle and the tooth surface in real time and outputting differentiated secondary prompts based on preset angle ranges, the system guides the user's operating posture, effectively improving the cleaning blind spots and physical damage caused by improper angles in traditional water flossers. This angle-aware dynamic interaction mechanism transforms vague sensations into visual standards, not only reducing the risk of gum damage or incomplete cleaning due to improper operation but also significantly improving the cleaning efficiency and safety of the water flosser through real-time posture correction and confirmation, achieving closed-loop control.

[0043] Optionally, the first type of prompt information is used to prompt for increasing or decreasing the relative distance between the nozzle and the tooth surface; the second type of prompt information is used to prompt for increasing or decreasing the angle between the nozzle and the tooth surface.

[0044] In this embodiment, the first type of prompt information is used to guide the user to adjust the relative distance, focusing on the straight-line length between the nozzle and the tooth surface. By outputting the first type of prompt information, it is ensured that when the water reaches the teeth, it will neither hurt the gums due to being too close nor fail to remove dirt due to being too far away. It can be understood that both the first and second types of prompt information can be output through the same prompt module or through multiple prompt modules. For example, suppose the relative distance d = 1.5mm (less than the safety threshold of 2mm). The water flow has no space to diffuse and directly impacts the gingival sulcus, resulting in excessive pressure. At this time, the control device can control the voice prompt module of the water flosser to prompt the user, "The distance is too close, please pull the nozzle back!" At the same time, a flashing red light can also be used to guide the user to increase the relative distance. Similarly, suppose the relative distance d = 20mm (greater than the effective threshold of 15mm). The water column disperses in the air, and the pressure decreases significantly when it reaches the teeth, making it unable to remove stubborn plaque. At this point, the control device needs to control the voice prompt module to remind the user: "Too far away, please move closer to the teeth!" It can also be used in conjunction with a blue light prompt to guide the user to reduce the relative distance.

[0045] In this embodiment, the second type of prompt message focuses on the angle between the centerline of the water jet from the nozzle and the tooth surface (or the plane of the interdental space), ensuring that the water jet can "cut into" the interdental space at a suitable angle or flow along the gingival sulcus. Assuming the angle between the tilt angle and the tooth surface is θ = 90° (or the deviation is within ±10°), the water jet hitting the tooth surface or gums perpendicularly will generate a huge reaction force (back pressure), easily causing gum pain, and the water jet will have difficulty penetrating the narrow interdental space, with most of the water splashing out. At this time, the control device controls the voice prompt module to output the second type of prompt message, such as "The angle is too straight, please tilt the nozzle" (prompting the user to change the angle). If the tilt angle θ < 15°, the water flow almost skims along the tooth surface. While this won't damage the gums, it won't generate enough lateral pressure to "push out" any stuck bits of meat or vegetables. In this case, the second type of prompt message should be output, such as "Angle too flat, please press down slightly!" If the angle is between 45° and 60°, this angle best conforms to fluid dynamics. The water flows smoothly into the gap between the teeth, using turbulence to "roll" out the dirt, while simultaneously massaging the gums along the gingival sulcus. In this case, no warning should be output, but a confirmation message "Cleaning angle correct" should be output.

[0046] By outputting the first type of prompt information and / or the second type of prompt information, real-time feedback can be given to the user to correct the user's rinsing operation, thereby improving the cleaning effect and safety of the water flosser.

[0047] In another embodiment, reference Figure 5After acquiring the water pump drive current and spatial attitude data of the oral irrigator in its working state, the control method of the oral irrigator further includes: Step S400: Determine the cleaning area of ​​the oral irrigator based on the spatial posture data, and record the duration of a single continuous rinsing of the cleaning area; Step S500: When the duration of a single continuous rinse reaches the recommended cleaning duration corresponding to the cleaning area, the user interaction module is controlled to output a movement prompt signal to prompt the user to switch cleaning areas.

[0048] In this embodiment, the oral irrigator may also include an attitude sensor (such as a six-axis IMU) and a timer module. The control device analyzes the spatial attitude data (acceleration, angular velocity, magnetic field strength) collected by the attitude sensor in real time and maps the attitude to a preset oral anatomy structure through a preset attitude calculation algorithm. For example, when the nozzle is detected pointing downward to the left at a first angle, it is determined to be the "lower left posterior tooth area"; when the nozzle is detected pointing upward to the right at a second angle, it is determined to be the "upper right posterior tooth area"; when the nozzle is detected to be basically horizontal and in the front of the mouth, it is determined to be the "anterior tooth area". Once a cleaning area is determined, the control device starts the timer module to record the duration of the current continuous rinsing, i.e., the duration of a single continuous rinsing. The control device can compare the determined duration of a single continuous rinsing with the "recommended cleaning duration" pre-stored in the memory. If the duration of a single continuous rinsing reaches the recommended cleaning duration, the user interaction module is triggered. It is understood that each cleaning area can correspond to the same or different recommended cleaning durations, which can be set by the user or the developer according to the actual cleaning needs. For example, for users with unhealthy teeth, the recommended cleaning time for each section (cleaning area) of their teeth can be sent via an external terminal communicating with the water flosser, based on the dentist's instructions. In this embodiment, assuming the control device identifies the current cleaning area as the anterior teeth area, it queries the preset cleaning area-recommended cleaning time mapping table in the memory and determines the recommended cleaning time to be 15 seconds. When the user continuously rinses the "lower left posterior teeth area" for 15 seconds, the controller controls the user interaction module to output a movement prompt signal (such as vibration of the vibration motor, display of a "→" arrow on the screen, and voice prompt "Please move to the next area"). This reduces the risk of the user staying in one place for too long (e.g., more than 30 seconds), which could damage or numb the gums due to prolonged water flow. In this way, the water flosser can encourage the user to move the nozzles in a preset order, ensuring that all teeth (usually recommended to be divided into 4-6 sections) receive a balanced cleaning and preventing plaque residue in some areas due to insufficient rinsing time.

[0049] It should be noted that the control device can trigger the timing mechanism based on the results uploaded by the current detection module. For example, when the control device determines that the water pump drive current I > 0 (i.e., the water pump is working and water is spraying), it starts the timer, excluding the situation where the user is holding the machine but it is not turned on, ensuring that the recorded "rinsing time" is the true "rinsing time". When the user is rinsing in the same area, the angle of the machine is relatively fixed, or within a certain angle range (e.g., always facing the lower left back teeth). Therefore, when the water pump starts, the control device will read the IMU data in real time. If the attitude change angle Δθ is not greater than the preset change threshold (e.g., 15°), it means that the current attitude angle deviates very little from the angle at the start of the timing, and it is determined that the user is "still in the current cleaning area", and the timer continues to accumulate. If the attitude change angle changes drastically (e.g., suddenly moving from the lower left to the upper right), Δθ will be greater than the preset change threshold, and the control device determines that the user has "switched cleaning areas". At this time, it will stop the current timing, reset it, or start a new timing.

[0050] Understandably, during actual use, users might pause to spit or adjust their mouth position without changing the cleaning area. To prevent such brief pauses from interrupting the timer, a countdown window needs to be set. When the water pump current is detected to be 0 (water spraying stops), the timer is not immediately reset to zero, but instead starts a temporary countdown (e.g., 3 seconds). If the user presses the switch again within 3 seconds and the posture angle does not exceed the preset change threshold, it is determined as "continuous operation in the same cleaning area," and the timer continues to accumulate based on the original time. If the user still does not operate after 3 seconds, it is determined that the rinsing of that area is finished, the final time is confirmed as the "single continuous rinsing duration," and the timer is reset to zero. In this way, the water pump drive current is used to confirm whether the oral irrigator is working, and the change in spatial posture data is used to confirm whether it is in the same position, thereby determining the single continuous rinsing duration of the cleaning area.

[0051] By using spatial posture data and rinsing time, the system intelligently guides the user's cleaning path, effectively reducing localized over-cleaning (such as gum damage) or under-cleaning (such as missed areas) caused by users rinsing "by feel." This not only standardizes users' cleaning habits and ensures balanced care for all teeth, but also significantly improves the intelligence level and user experience of the water flosser, making the oral cleaning process more efficient and safer.

[0052] In one embodiment, reference Figure 6 The step of controlling the user interaction module to output the first type of prompt information based on the relative distance includes: controlling the user interaction module to output the first type of prompt information based on the relationship between the relative distance and a preset cleaning distance threshold; the control method of the water flosser further includes: Step S600: Determine the working mode of the oral irrigator, including standard mode, gentle mode and pulse mode; Step S700: Determine the preset cleaning distance threshold corresponding to the working mode according to the working mode; The preset cleaning distance threshold corresponding to the pulse mode is greater than the preset cleaning distance threshold corresponding to the standard mode, and the preset cleaning distance threshold corresponding to the standard mode is greater than the preset cleaning distance threshold corresponding to the gentle mode.

[0053] In this embodiment, the control device can read the user's current mode setting instructions. These mode setting instructions typically come from the device's buttons, touchscreen selections, or settings on a mobile app. The control device can identify the current operating mode of the water flosser through these mode setting instructions. In this embodiment, the operating modes include, but are not limited to, gentle mode, standard mode, and pulse mode. Gentle mode uses low water pressure, suitable for beginners or those with sensitive gums. Standard mode uses medium water pressure, suitable for daily cleaning. Pulse mode uses high-frequency, high-pressure water flow, suitable for deep cleaning of stubborn plaque.

[0054] It should be noted that the memory can be pre-stored by R&D personnel for safety distance parameters (preset cleaning distance thresholds) under different working modes. These preset cleaning distance thresholds can include upper and lower limits; for example, the preset first distance described in the above embodiment is the lower limit, and the preset second distance is the upper limit. The control device can call at least one preset cleaning distance threshold corresponding to a determined working mode.

[0055] Understandably, the same preset cleaning distance threshold will have different values ​​in different working modes. For distance thresholds, the preset cleaning distance threshold for pulse mode is greater than that for standard mode, and the preset cleaning distance threshold for standard mode is greater than that for gentle mode. For example, for the upper limit preset second distance, the value for pulse mode can be set to 10mm, standard mode to 5mm, and gentle mode to 3mm. Pulse mode has a strong water flow impact and a long range; therefore, it can achieve a certain cleaning effect even at a greater distance. If the setting is too small (e.g., 3mm), it may restrict the user's operating space, causing the water flow to concentrate too much energy at the outlet, resulting in waste or discomfort. The water flow in gentle mode is inherently weak, so the maximum effective distance should be smaller than that of pulse mode and standard mode. If the distance is too far, the water flow will disperse in the air, and the water flow reaching the teeth may not be able to remove residue from between the teeth. Furthermore, regarding the preset first distance for the lower limit, the preset first distance for pulse mode is greater than that for standard mode, and the preset first distance for standard mode is greater than that for gentle mode. Among the three modes, pulse mode has the strongest impact force, therefore it must force the user to maintain a greater distance to prevent injury to the gums, while gentle mode itself has the weakest impact force, and even if it is placed very close, it will not injure the gums, so the lower limit can be set very small.

[0056] By introducing a dynamic correlation mechanism between working modes and preset cleaning distance thresholds, the water flosser achieves a dual improvement in intelligent guidance and safety protection. Specifically, based on the hydrodynamic characteristics of different working modes, the baseline for distance judgment is adaptively adjusted, overcoming the challenge that a single fixed threshold cannot simultaneously address cleaning efficiency and safety under different water pressure modes. In pulse mode, due to the strong water flow impact and long range, a larger preset cleaning distance threshold is used. This allows users to effectively clean from a greater distance, avoiding discomfort caused by excessive water energy concentration, while also forcibly setting a higher safety lower limit to prevent high-pressure water flow from damaging the gums. In gentle mode, considering the rapid attenuation of water flow energy and short range, a smaller preset cleaning distance threshold is used, guiding the user to operate closer to the teeth. This ensures that the weak water flow effectively impacts between teeth, while the extremely close lower limit will not cause harm due to the weak impact force. In this way, the water flosser can provide good cleaning efficiency and appropriate safety protection boundaries in different working modes, improving user comfort.

[0057] The present invention also proposes a water flosser, the water flosser including a control device, the control device including: a memory, a processor and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the control method of the water flosser described above.

[0058] Optionally, the water flosser further includes a user interaction module, and the control device is electrically connected to the user interaction module. The control device is used to control the user interaction module to output either a first type of prompt information or a second type of prompt information.

[0059] The user interaction module includes any one or more combinations of a display module, a sound prompt module, a haptic feedback module, and a communication module.

[0060] In this embodiment, the display module includes, but is not limited to, LED indicator lights (red / green / blue), LCD screens, OLED screens, etc.; the sound prompt module includes, but is not limited to, buzzers, speakers, etc.; the haptic feedback module includes, but is not limited to, linear motors, eccentric wheel motors, etc.; and the communication module includes, but is not limited to, Bluetooth modules, Wi-Fi modules, NFC modules, etc.

[0061] In this embodiment, the user interaction module establishes a bridge for communication between the control device and the user. Based on the above embodiments, after determining the relative distance based on the water pump drive current and the tilt angle based on spatial posture data, the control device can output corresponding prompts to the user through the user interaction module. For example, if the water flosser is equipped with both a speaker and an LED indicator, and assuming the relative distance is less than the safety threshold of 2mm, the water flow has no space to diffuse and directly impacts the gingival sulcus, resulting in excessive pressure, the control device can control the speaker to prompt the user, "Too close, please pull the nozzle further back!" Simultaneously, the LED indicator can flash red to guide the user to increase the relative distance. Thus, by seeing the red light and hearing the voice prompt, the user can realize the operational error and pull the nozzle further back.

[0062] In practical applications, the water flosser can determine in real time whether the current rinsing area is within the effective cleaning zone and drive the user interaction module to output targeted prompts. This real-time, intuitive closed-loop feedback mechanism effectively corrects users' poor operating habits, reduces oral health risks caused by improper operation, and improves the cleaning efficiency and safety of the water flosser. Furthermore, by outputting prompts, it not only corrects user behavior promptly when errors occur but also provides positive encouragement when correct operation is performed, stimulating a sense of accomplishment and helping users maintain long-term oral care habits.

[0063] The oral irrigator provided by this invention is based on the oral irrigator control method described above. Compared with the prior art, the beneficial effects of the oral irrigator provided by this invention are the same as the beneficial effects of the oral irrigator control method provided in the above embodiments, and other technical features of the oral irrigator are the same as those disclosed in the methods of the above embodiments, and will not be repeated here.

[0064] The above description is only a part of the embodiments of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made under the technical concept of the present invention using the contents of the present invention specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A method for controlling a dental flosser, characterized in that, The oral irrigator includes a nozzle, a water pump, and a user interaction module. The control method of the oral irrigator includes: Acquire the water pump drive current and spatial attitude data of the water flosser during operation; The relative distance between the nozzle and the tooth surface is determined based on the water pump drive current, and the tilt angle of the nozzle relative to the tooth surface is determined based on the spatial posture data. The user interaction module is controlled to output a first type of prompt information based on the relative distance, and / or, the user interaction module is controlled to output a second type of prompt information based on the tilt angle.

2. The control method for the oral irrigator as described in claim 1, characterized in that, Determining the relative distance between the nozzle and the tooth surface based on the water pump drive current includes: If the pump drive current is greater than or equal to a preset first current threshold, it is determined that the relative distance is less than or equal to a preset first distance. If the pump drive current is less than or equal to a preset second current threshold, it is determined that the relative distance is greater than or equal to a preset second distance. If the pump drive current is greater than a preset second current threshold and less than a preset first current threshold, then the relative distance is determined to be greater than a preset first distance and less than a preset second distance. Wherein, the preset first current threshold is greater than the preset second current threshold, and the preset second distance is greater than the preset first distance.

3. The control method for a dental flosser as described in claim 2, characterized in that, The step of controlling the user interaction module to output the first type of prompt information based on the relative distance includes: If the relative distance is less than or equal to a preset first distance, the user interaction module is controlled to output a close-range warning message; When the relative distance is greater than or equal to a preset second distance, the user interaction module is controlled to output a long-distance prompt message; When the relative distance is greater than a preset first distance and less than a preset second distance, the user interaction module is controlled to output valid cleaning confirmation information.

4. The control method for the oral irrigator as described in claim 1, characterized in that, The step of controlling the user interaction module to output the second type of prompt information according to the tilt angle includes: When the tilt angle is less than or equal to a preset first angle, the user interaction module is controlled to output an abnormal posture warning message. When the tilt angle is greater than or equal to a preset second angle, the user interaction module is controlled to output a verticality correction prompt message. When the tilt angle is greater than a preset first angle and less than a preset second angle, the user interaction module is controlled to output valid cleaning confirmation information. The tilt angle is the angle between the nozzle and the tooth surface, the preset second angle is greater than the preset first angle, and the preset second angle is equal to 90 degrees.

5. The control method for a dental flosser as described in claim 1, characterized in that, The first type of prompt information is used to indicate whether to increase or decrease the relative distance between the nozzle and the tooth surface; the second type of prompt information is used to indicate whether to increase or decrease the angle between the nozzle and the tooth surface.

6. The control method for a water flosser as described in any one of claims 1 to 5, characterized in that, After acquiring the water pump drive current and spatial attitude data of the oral irrigator in its working state, the control method of the oral irrigator further includes: The cleaning area of ​​the water flosser is determined based on the spatial posture data, and the duration of a single continuous rinsing of the cleaning area is recorded. When the duration of a single continuous rinse reaches the recommended cleaning time for the corresponding cleaning area, the user interaction module is controlled to output a movement prompt signal to prompt the user to switch cleaning areas.

7. The control method for a water flosser as described in any one of claims 1 to 5, characterized in that, The step of controlling the user interaction module to output a first type of prompt information based on the relative distance includes: controlling the user interaction module to output a first type of prompt information based on the relationship between the relative distance and a preset cleaning distance threshold; the control method of the oral irrigator further includes: Determine the operating mode of the oral irrigator, which includes standard mode, gentle mode, and pulse mode; Based on the working mode, determine the preset cleaning distance threshold corresponding to the working mode; The preset cleaning distance threshold corresponding to the pulse mode is greater than the preset cleaning distance threshold corresponding to the standard mode, and the preset cleaning distance threshold corresponding to the standard mode is greater than the preset cleaning distance threshold corresponding to the gentle mode.

8. A dental flosser, characterized in that, The oral irrigator includes a control device comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the control method for the oral irrigator as claimed in any one of claims 1 to 7.

9. The oral irrigator as described in claim 8, characterized in that, The water flosser also includes a user interaction module. The control device is electrically connected to the user interaction module and is used to control the user interaction module to output either a first type of prompt information or a second type of prompt information.

10. The oral irrigator as described in claim 9, characterized in that, The user interaction module includes any one or more combinations of a display module, an audio prompt module, a haptic feedback module, and a communication module.

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