Dental low-speed bending handpiece with light warning function

Abstract

The utility model relates to a dental low -speed bending machine head with light early warning function, including bending machine head body and drive the drive shaft of root canal file, still include LED light component, control unit and torque acquisition module, the LED light component fixed setting is at the neck outer surface of bending machine head body, torque acquisition module includes the strain sensor of affixing drive shaft surface for real -time acquisition torque signal, control unit and torque acquisition module and LED light component electric connection, configure as according to torque signal drive LED light component display and torque value corresponding color, the utility model aims at providing a dental low -speed bending machine head of integrated real -time visual early warning function, prompts the torque state through the light color change, assists the doctor safe operation.

Description

Technical Field

[0001] This utility model relates to the field of dental instrument technology, specifically to a low-speed dental bending head with a light warning function. Background Technology

[0002] Currently, low-speed dental tractors primarily function as the mechanical transmission component between the drive unit and the rotary endodontic file, providing the file with rotational speed and torque. However, these devices lack real-time safety warning mechanisms, making it difficult for dentists to perceive changes in resistance within the root canal during operation. This can lead to file breakage (instrument separation) due to excessive torque, increasing surgical risks and the difficulty of managing complications. Although some dentists have attempted to maintain tactile feedback using hand-held endodontic files, efficiency has significantly decreased. Therefore, there is an urgent need for a technological solution that can provide real-time safety warnings while maintaining the efficiency advantages of rotary instruments. Utility Model Content

[0003] In view of this, the present invention aims to provide a dental low-speed bending head with integrated real-time visual warning function, which indicates the torque status through changes in light color to assist doctors in safe operation.

[0004] The objective of this utility model is achieved through the following technical solution: A low-speed dental bending head with a light warning function includes a bending head body and a drive shaft for driving root canal files, as well as an LED light assembly, a control unit, and a torque acquisition module. The LED light assembly is fixedly mounted on the outer surface of the neck of the bending head body. The torque acquisition module includes a strain sensor attached to the surface of the drive shaft for real-time acquisition of torque signals. The control unit is electrically connected to the torque acquisition module and the LED light assembly and is configured to drive the LED light assembly to display a color corresponding to the torque value based on the torque signal.

[0005] An innovative dental instrument structure is presented, significantly improving surgical safety by integrating three core components into a traditional curved instrument head. Specifically, an LED lighting assembly fixed to the outer surface of the curved instrument head provides the dentist with an intuitive visual feedback channel; a strain sensor design attached to the drive shaft surface ensures the real-time and accurate acquisition of torque signals; and the electrical connection configuration of the control unit establishes a complete signal processing link from data acquisition to visual feedback. This structural combination solves a long-standing operational hazard in dental surgery—the problem that dentists cannot perceive changes in resistance within the root canal when using a rotary root canal file.

[0006] The technological advantages of this solution are as follows: First, through innovative physical structure, the visual warning function is directly integrated into the surgical site, allowing doctors to obtain critical safety information without shifting their gaze. Second, the direct attachment design of the strain sensor to the drive shaft avoids signal delays or distortions caused by traditional indirect measurement methods. Finally, the overall structure maintains the compactness of the dental bending head, without affecting the doctor's grip or increasing operational burden. This structural design fundamentally changes the functional limitation of traditional low-speed dental bending heads, which are merely transmission devices, providing a real-time safety guarantee mechanism for root canal treatment.

[0007] Preferably, the LED lighting component is a multi-color LED light, having at least three light emission states: green, yellow, and red.

[0008] The color display capabilities of the LED lighting components are further limited, providing clear safety level indications through at least three color states. Green represents a safe operating range, yellow indicates increased torque requiring careful operation, and red warns of a high-risk condition. This color coding system, consistent with universal human perception, significantly reduces the information recognition burden on doctors. The use of multi-color LEDs ensures the visibility and recognizability of color signals in complex surgical environments, enabling doctors to quickly understand the current instrument status, adjust operating force in a timely manner, or replace instruments, effectively preventing root canal file breakage accidents.

[0009] Preferably, the LED lighting assembly is a ring-shaped light strip surrounding the neck, or one or more LED beads discretely distributed on the surface of the neck.

[0010] This design allows for various physical layouts of the LED lighting components, providing adaptive solutions for different surgical scenarios. The ring-shaped light strip design ensures 360-degree visibility, guaranteeing the surgeon can observe the lighting status regardless of the instrument head's rotation. The discretely distributed LED bulbs offer more flexible installation options, suitable for space-constrained instrument models. All these layouts are positioned at key neck locations, adhering to ergonomic principles and allowing the surgeon to receive visual feedback from a natural grip position. This inclusive design with multiple implementations meets the needs of different manufacturing processes, ensures the reliability of core warning functions across various structural variations, and avoids limitations imposed by specific shapes or sizes.

[0011] Preferably, the bending head body has a wire channel inside that connects the neck to the tail, and the LED light assembly is connected to the control unit through a cable passing through it.

[0012] The built-in cable channel design solves the problems of signal transmission line protection and layout. The dedicated channel completely houses the connecting cable within the curved instrument head, avoiding the problem of external cables tangling and affecting operation, and preventing the risk of short circuits caused by oral fluid seepage. This enclosed cabling solution keeps the instrument surface smooth and clean, meeting the stringent sterilization and hygiene requirements of dental instruments. The continuous design of the channel extending from the neck to the tail ensures the shortest signal transmission distance, reducing the possibility of signal interference, while maintaining the original fluid shape of the curved instrument head and not affecting the dentist's grip comfort.

[0013] Preferably, the control unit is fixed to the tail of the bending head body and has an electrical interface for interfacing with an external host.

[0014] The integration location and connection method of the control unit have been optimized. Fixing the control unit at the tail end utilizes the unused space of the traditional curved instrument head while maintaining the instrument's center of gravity balance. The design of the external host interface ensures compatibility with existing dental equipment, avoiding the need for modifications to the clinic's infrastructure. This tail-integration solution ensures the control unit is kept away from the surgical area to prevent accidental damage from collisions, while also facilitating maintenance and replacement. The standardized interface design supports plug-and-play functionality, simplifying the device connection process and enabling compatibility with different brands of drive units, significantly improving the clinical application and widespread adoption of this early warning system.

[0015] Preferably, the torque acquisition module further includes a signal conversion circuit that converts the strain signal into an electrical signal.

[0016] Key aspects of the signal processing chain have been improved. The added signal conversion circuit achieves precise conversion from physical quantities to electrical signals, solving the problem of susceptibility to interference in the original strain signal. This circuit, acting as a bridge between mechanical sensing and electronic control, ensures sufficient stability and signal-to-noise ratio in the acquired torque signal, preventing false alarms. The standardized electrical signal format after conversion also facilitates processing and analysis by the control unit, improving the overall system's response speed and reliability. This layered signal processing structure not only ensures data acquisition accuracy but also provides a high-quality input source for subsequent color mapping.

[0017] Preferably, the control unit has pre-stored color mapping rules associated with the torque value.

[0018] The core processing logic of the control unit is defined. Pre-stored color mapping rules enable the system to intelligently convert continuous torque signals into discrete color commands; this pre-defined rule mechanism avoids the latency issues of real-time calculation. The design of storing rules locally on the control unit ensures that the warning function can operate independently without relying on external devices, improving system reliability. The establishment of an associative mapping mechanism achieves effective conversion from physical parameters to visual information; this non-numerical expression method better meets the needs of rapid decision-making during surgery. The flexibility of pre-stored rules also provides basic support for adapting to different types of root canal files; the system's applicability can be expanded by updating the mapping rules.

[0019] Preferably, the color mapping rule includes a safety threshold and a warning threshold set based on the maximum torque value of the root canal file.

[0020] The key parameter settings for the color mapping rules were refined. A progressive risk warning system was established through the dual setting of safety and warning thresholds, enabling physicians to differentiate between levels of attention and urgency. The relative threshold setting based on the maximum torque value of the root canal file ensures the adaptability of the warning system to different instrument characteristics, avoiding a one-size-fits-all safety standard. This threshold design principle simulates the process by which experienced physicians judge risk by touch, transforming subjective experience into objective standards. This preserves the essence of clinical operation while eliminating the uncertainty caused by individual judgment differences.

[0021] Preferably, the LED lighting assembly is provided with a detachable transparent protective cover, which is connected to the bending head body by a buckle or thread. The transparent protective cover is made of high-temperature resistant polycarbonate material.

[0022] This design solves the protection and maintenance issues of LED components. The transparent protective cover ensures light transmission while effectively isolating liquids, debris, and chemical disinfectants in the oral environment, significantly extending the lifespan of electronic components. The detachable design, combined with snap-fit ​​or threaded connections, balances secure installation with ease of maintenance, allowing nurses to quickly disassemble, clean, or replace damaged parts. This protective structure is particularly suitable for the frequent high-temperature, high-pressure sterilization environments of dental instruments. The protective cover material is selected to withstand sterilization cycles without aging or yellowing, maintaining excellent optical transparency at all times. The modular design also reduces overall maintenance costs; only the protective cover needs to be replaced, rather than the entire component, if localized damage occurs.

[0023] Preferably, the LED lighting assembly is located in the unobstructed area of ​​the neck side wall of the bending head body.

[0024] The accessibility of visual information has been optimized. By specifically limiting installation to an unobstructed area, it ensures that the light signal is not blocked by the surgeon's fingers or surgical instruments, maintaining continuous visibility of the warning information. The position on the side of the neck is within the surgeon's natural line of sight, conforming to visual habits during surgery, allowing for the detection of color changes without the need for deliberate adjustments to the viewing angle. This positioning also avoids visual interference with the root canal file working area, preventing misjudgment. The zoning fully considers the differences in visibility under different holding postures, ensuring that the light component is in the optimal observation position regardless of whether the hand is held firmly or with a pen, maximizing the effectiveness of the visual warning system.

[0025] The advantages of this utility model compared to the prior art are: 1. Visual feedback as a substitute for tactile feedback: A multi-color lighting system driven by torque signals transforms invisible mechanical resistance into intuitive visual signals, helping doctors identify torque status in the absence of tactile feedback.

[0026] 2. Improved surgical safety: Grading color warnings (such as green-yellow-red) can reduce the risk of root canal file breakage and reduce medical complications caused by instrument separation.

[0027] 3. Ergonomic optimization: The neck LED layout combined with the setting of unobstructed areas may allow doctors to obtain warning information in a natural operating posture, reducing the need for eye shift.

[0028] 4. Strong structural compatibility: The tail control unit and standardized interface design can achieve plug-and-play with existing dental equipment, reducing the threshold for clinical promotion.

[0029] 5. Ease of maintenance: The removable protective cover design may extend the life of electronic components and simplify the disinfection and maintenance process. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a structural diagram of a dental low-speed bending head with a light warning function according to an embodiment of the present invention.

[0032] Figure 2 This is a structural diagram of a dental low-speed bending head with a light warning function, according to another embodiment of the present invention.

[0033] Labeling explanation: 1. Bending head body, 11. Drive shaft, 2. LED lighting assembly, 3. Wire channel, 4. Transparent protective cover. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0036] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of the embodiments of this application, it should be understood that the terms "upper," "lower," "left," "right," "vertical," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship commonly used when the product of this application is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0037] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0038] The technical solutions in this application will now be described with reference to the accompanying drawings.

[0039] This embodiment provides a dental low-speed bending head with a light warning function, including a bending head body 1 and a drive shaft 11 for driving root canal files, as well as an LED light assembly 2, a control unit and a torque acquisition module; LED light assembly 2 is fixedly installed on the outer surface of the neck of the bending head body 1; The torque acquisition module includes a strain sensor attached to the surface of the drive shaft 11 for real-time acquisition of torque signals; The control unit is electrically connected to the torque acquisition module and the LED light assembly 2, and is configured to drive the LED light assembly 2 to display a color corresponding to the torque value according to the torque signal.

[0040] An innovative dental instrument structure is presented, significantly improving surgical safety by integrating three core components into a traditional curved instrument head. Specifically, the LED lighting assembly 2, fixedly mounted on the outer surface of the curved instrument head neck, provides the dentist with an intuitive visual feedback channel; the strain sensor design attached to the surface of the drive shaft 11 ensures the real-time and accurate acquisition of torque signals; and the electrical connection configuration of the control unit establishes a complete signal processing link from data acquisition to visual feedback. This structural combination solves a long-standing operational hazard in dental surgery—the problem that dentists cannot perceive changes in resistance within the root canal when using a rotary root canal file.

[0041] The technological advantages of this solution are as follows: First, through innovative physical structure, the visual warning function is directly integrated into the surgical site, allowing doctors to obtain critical safety information without shifting their gaze. Second, the direct attachment design of the strain sensor to the drive shaft 11 avoids signal delay or distortion caused by traditional indirect measurement methods. Finally, the overall structure maintains the compactness of the dental bending head, without affecting the doctor's grip or increasing operational burden. This structural design fundamentally changes the functional limitation of traditional low-speed dental bending heads, which are merely transmission devices, providing a real-time safety guarantee mechanism for root canal treatment.

[0042] In this embodiment, the LED light component 2 is a multi-color LED light, which has at least three light emission states: green, yellow and red.

[0043] The color display capability of LED lighting component 2 is further limited, providing clear safety level indications through at least three color states. Green represents a safe operating range, yellow indicates increased torque requiring careful operation, and red warns of a high-risk condition. This color coding system, consistent with universal human perception, significantly reduces the information recognition burden on doctors. The use of multi-color LEDs ensures the visibility and recognizability of color signals in complex surgical environments, enabling doctors to quickly understand the current instrument status, adjust operating force or change instruments in a timely manner, and effectively prevent root canal file breakage accidents.

[0044] In this embodiment, the LED light assembly 2 consists of one or more LED beads discretely distributed on the surface of the neck. In other embodiments, it may also consist of multiple LED beads or a ring-shaped light strip surrounding the neck.

[0045] The design allows for multiple physical layouts of the LED lighting component 2, providing adaptive solutions for various surgical scenarios. The ring-shaped light strip design ensures 360-degree visibility, guaranteeing the surgeon can observe the lighting status regardless of the instrument head's rotation. The discretely distributed LED bulbs offer more flexible installation options, suitable for space-constrained instrument models. All these layouts are positioned at key neck locations, adhering to ergonomic principles and allowing the surgeon to receive visual feedback from a natural grip position. This inclusive design with multiple implementations meets the needs of different manufacturing processes, ensures the reliability of the core warning function across various structural variations, and avoids limitations imposed by specific shapes or sizes.

[0046] In this embodiment, the bending head body 1 has a wire channel 3 inside that connects the neck to the tail, and the LED light assembly 2 is connected to the control unit through a cable passing through it.

[0047] The built-in cable channel 3 design solves the problems of signal transmission line protection and layout. This dedicated channel completely houses the connecting cable within the curved instrument head body 1, avoiding the problem of external cables tangling and affecting operation, and preventing the risk of short circuits caused by oral fluid seepage. This enclosed wiring solution maintains the smooth and clean surface of the instrument, meeting the stringent sterilization and hygiene requirements of dental instruments. The continuous design of channel 3, extending from the neck to the tail, ensures the shortest signal transmission distance, reducing the possibility of signal interference, while maintaining the original fluid shape of the curved instrument head and not affecting the doctor's grip comfort.

[0048] In this embodiment, the control unit is fixed to the tail of the bending head body 1 and has an electrical interface for interfacing with an external host.

[0049] The integration location and connection method of the control unit have been optimized. Fixing the control unit at the tail end utilizes the unused space of the traditional curved instrument head while maintaining the instrument's center of gravity balance. The design of the external host interface ensures compatibility with existing dental equipment, avoiding the need for modifications to the clinic's infrastructure. This tail-integration solution ensures the control unit is kept away from the surgical area to prevent accidental damage from collisions, while also facilitating maintenance and replacement. The standardized interface design supports plug-and-play functionality, simplifying the device connection process and enabling compatibility with different brands of drive units, significantly improving the clinical application and widespread adoption of this early warning system.

[0050] In this embodiment, the torque acquisition module also includes a signal conversion circuit that converts the strain signal into an electrical signal.

[0051] Key aspects of the signal processing chain have been improved. The added signal conversion circuit achieves precise conversion from physical quantities to electrical signals, solving the problem of susceptibility to interference in the original strain signal. This circuit, acting as a bridge between mechanical sensing and electronic control, ensures sufficient stability and signal-to-noise ratio in the acquired torque signal, preventing false alarms. The standardized electrical signal format after conversion also facilitates processing and analysis by the control unit, improving the overall system's response speed and reliability. This layered signal processing structure not only ensures data acquisition accuracy but also provides a high-quality input source for subsequent color mapping.

[0052] In this embodiment, the control unit has pre-stored color mapping rules associated with the torque value.

[0053] The core processing logic of the control unit is defined. Pre-stored color mapping rules enable the system to intelligently convert continuous torque signals into discrete color commands; this pre-defined rule mechanism avoids the latency issues of real-time calculation. The design of storing rules locally on the control unit ensures that the warning function can operate independently without relying on external devices, improving system reliability. The establishment of an associative mapping mechanism achieves effective conversion from physical parameters to visual information; this non-numerical expression method better meets the needs of rapid decision-making during surgery. The flexibility of pre-stored rules also provides basic support for adapting to different types of root canal files; the system's applicability can be expanded by updating the mapping rules.

[0054] In this embodiment, the color mapping rule includes a safety threshold and a warning threshold set based on the maximum torque value of the root canal file.

[0055] The key parameter settings for the color mapping rules were refined. A progressive risk warning system was established through the dual setting of safety and warning thresholds, enabling physicians to differentiate between levels of attention and urgency. The relative threshold setting based on the maximum torque value of the root canal file ensures the adaptability of the warning system to different instrument characteristics, avoiding a one-size-fits-all safety standard. This threshold design principle simulates the process by which experienced physicians judge risk by touch, transforming subjective experience into objective standards. This preserves the essence of clinical operation while eliminating the uncertainty caused by individual judgment differences.

[0056] In this embodiment, the LED light assembly 2 is provided with a detachable transparent protective cover 4, which is connected to the bending head body 1 by a buckle or thread.

[0057] The protection and maintenance of LED components have been solved. The transparent protective cover 4 effectively isolates liquids, debris, and chemical disinfectants in the oral environment while ensuring light transmission, significantly extending the lifespan of electronic components. The detachable design, combined with snap-fit ​​or threaded connections, balances secure installation with ease of maintenance, allowing nurses to quickly disassemble, clean, or replace damaged parts. This protective structure is particularly suitable for the frequent high-temperature, high-pressure sterilization environments of dental instruments. The material of the protective cover 4 is selected to withstand sterilization cycles without aging or yellowing, maintaining excellent optical transparency at all times. The modular design also reduces overall maintenance costs; only the protective cover 4 needs to be replaced, rather than the entire component, if localized damage occurs.

[0058] In this embodiment, the LED light assembly 2 is disposed in the unobstructed area of ​​the neck side wall of the bending head body 1.

[0059] The accessibility of visual information has been optimized. By specifically limiting its installation to an unobstructed area, it ensures that the light signal is not blocked by the surgeon's fingers or surgical instruments, maintaining continuous visibility of the warning information. The position on the side of the neck is within the surgeon's natural line of sight, conforming to visual habits during surgery, allowing for the detection of color changes without the need for deliberate adjustments to the viewing angle. This positioning also avoids visual interference with the root canal file working area, preventing misjudgment. The zoning fully considers the differences in visibility under different holding postures, ensuring that whether operating with a hand grip or a pen grip, the light component 2 is in the optimal observation position, maximizing the effectiveness of the visual warning system.

[0060] Design principles: An LED lighting assembly 2 is installed on the outer surface of the neck of the bending head body 1. This assembly uses multi-color LEDs (such as ring light strips or discrete LED beads) to display different colors.

[0061] The real-time collected torque values ​​are converted into corresponding colors using color mapping rules pre-stored in the control unit. The mapping rules are based on a threshold set according to the maximum torque value declared by the root canal file manufacturer (e.g., a maximum torque of 5 N·cm for file model A). Green: Torque value < 50% of maximum torque value (safe range, such as < 2.5 N·cm) Yellow: 50% of maximum torque value ≤ torque value < 80% of maximum torque value (warning range, e.g., 2.5-4 N·cm) Red: Torque value ≥ 80% of maximum torque value (dangerous range, such as ≥ 4 N·cm) The torque acquisition module acquires torque signals in real time through strain sensors on the surface of the drive shaft 11, and transmits them to the control unit via a signal conversion circuit. The control unit drives the LED light assembly 2 through a cable passing through the wire channel 3 to dynamically display the corresponding color.

[0062] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A dental low-speed curved head with a light warning function, comprising a curved head body (1) and a drive shaft (11) for driving root canal files, characterized in that, It also includes LED lighting components (2), a control unit, and a torque acquisition module; The LED light assembly (2) is fixedly installed on the outer surface of the neck of the bending head body (1); The torque acquisition module includes a strain sensor attached to the surface of the drive shaft (11) for real-time acquisition of torque signals; The control unit is electrically connected to the torque acquisition module and the LED light assembly (2), and is configured to drive the LED light assembly (2) to display a color corresponding to the torque value according to the torque signal.

2. The dental low-speed bending head according to claim 1, characterized in that, The LED lighting component (2) is a multi-color LED light, with at least three light-emitting states: green, yellow and red.

3. The dental low-speed bending head according to claim 1, characterized in that, The LED lighting assembly (2) is either a ring-shaped light strip surrounding the neck or one or more LED beads discretely distributed on the surface of the neck.

4. The dental low-speed bending head according to claim 1, characterized in that, The bending head body (1) has a wire channel (3) inside that connects the neck to the tail, and the LED light assembly (2) is connected to the control unit through a cable passing through it.

5. The dental low-speed bending head according to claim 1, characterized in that, The control unit is fixed to the tail of the bending head body (1) and has an electrical interface for connecting with an external host.

6. The dental low-speed bending head according to claim 1, characterized in that, The torque acquisition module also includes a signal conversion circuit that converts strain signals into electrical signals.

7. The dental low-speed bending head according to claim 6, characterized in that, The control unit has pre-stored color mapping rules associated with the torque value.

8. The dental low-speed bending head according to claim 7, characterized in that, The color mapping rules include safety thresholds and warning thresholds set based on the maximum torque value of the root canal file.

9. The dental low-speed bending head according to claim 1, characterized in that, The LED light assembly (2) is provided with a detachable transparent protective cover (4), which is connected to the bending head body (1) by a buckle or thread.

10. The dental low-speed bending head according to claim 1, characterized in that, The LED lighting assembly (2) is located in the unobstructed area of ​​the neck side wall of the bending head body (1).

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