Gutta-percha filling device

Abstract

The utility model relates to a gutta-percha filling device which comprises a shell, a cylindrical heating assembly, an electric heating element on the outer surface and a gutta-percha injection needle assembly, and a driving motor and a pushing mechanism are arranged in the shell; the cylindrical heating assembly comprises a metal heat conduction cylinder and an electric heating element, the glue injection needle assembly comprises a gutta-percha bin, and the tail end of the gutta-percha bin is connected with a glue injection needle; the pushing mechanism comprises a transmission assembly and a push rod. The transmission assembly is provided with a screw. The push rod is connected with the screw rod through a crimping connection assembly; the compression joint connecting assembly comprises a plurality of radial through holes formed in the tail end of the screw rod, steel balls contained in the radial through holes, a fixing sleeve installed at the tail end of the screw rod in a pressed mode and an annular groove formed in the front end of the push rod in a digging mode, and the inner surface of the fixing sleeve and the annular groove make contact with the steel balls respectively and tightly hold the steel balls. According to the utility model, through brand new structural design and part type selection, the assembly difficulty of the device is effectively reduced, complex procedures and professional skill requirements required in the assembly process are reduced, and the production cost is further reduced.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, and more specifically, to a gutta-percha filling device. Background Technology

[0002] In the field of dentistry, gutta-percha filling is a routine and crucial procedure primarily used to fill the root canals of teeth. This procedure plays an indispensable role in preventing bacteria from entering the tooth and creating an environment conducive to tooth healing, making it a key step in ensuring oral health and restoring tooth function.

[0003] However, existing gutta-percha filling devices on the market currently reveal a series of problems that urgently need to be addressed. Among these, the transmission components of some devices exhibit significant design flaws. On the one hand, the complexity of their structural design leads to a cumbersome assembly process, requiring specialized technicians to expend considerable time and effort, increasing labor costs and potentially affecting device performance due to improper assembly. On the other hand, complex structures often mean more parts and higher precision requirements, which undoubtedly increases raw material procurement and manufacturing costs significantly. These problems not only place considerable economic pressure on manufacturers but also indirectly affect the product's competitiveness and widespread application in the market.

[0004] Therefore, the development of a new type of gutta-percha filling device has become an urgent need in the industry. Utility Model Content

[0005] In view of this, the present invention provides a gutta-percha filling device, which effectively reduces the assembly difficulty of the device through a brand-new structural design and component selection, reduces the complex procedures and professional skill requirements required in the assembly process, and thus reduces production costs.

[0006] The objective of this utility model is achieved through the following technical solution:

[0007] A gutta-percha filling device includes a housing, a cylindrical heating assembly, an electric heating element on the outer surface, and a dispensing needle assembly. The housing contains a drive motor and a pushing mechanism connected to the output shaft of the drive motor. The cylindrical heating assembly includes a metal heat-conducting cylinder fixedly connected to the housing and an electric heating element spirally wound around the outer surface of the metal heat-conducting cylinder. The electric heating element is electrically connected to a power supply circuit within the housing. The dispensing needle assembly includes a gutta-percha tank, with a dispensing needle connected to the end of the tank. The pushing mechanism includes a transmission assembly and a push rod; the transmission assembly rotates... The motion is converted into linear displacement, which has a screw that moves linearly; the push rod is rigidly connected to the screw through a crimping connection assembly, and the end of the push rod extends into the inner cavity of the gutta-percha tank and forms a material pushing cooperation with the injection needle; the crimping connection assembly includes a plurality of radially through holes evenly distributed around the end of the screw, steel balls housed in the radially through holes, a fixing sleeve press-fitted to the end of the screw, and an annular groove carved at the front end of the push rod, the inner surface of the fixing sleeve and the annular groove respectively contacting and holding the steel balls.

[0008] In this gutta-percha filling device, the crimping connection assembly adopts a hand-crimping method to assemble the steel ball and the fixed sleeve, thereby completing the assembly of the push rod. This design has many outstanding advantages.

[0009] Compared to traditional special welding methods, this hand-pressed assembly method exhibits significant advantages. Because push rods and screws are typically made of different materials—for example, push rods are often made of ceramic, while screws are mostly made of metal or plastic—this material difference necessitates a special welding process to connect them. This special welding not only requires complex and specialized welding equipment but also demands extremely high skill levels from the operators; only welders with extensive professional training can perform this work. Furthermore, the special welding process generates a series of potential hazards, such as intense light that can damage the operator's eyes and the release of harmful gases that can seriously threaten the operator's health. More importantly, even with professional skills, slight carelessness during actual operation can lead to inconsistent welding quality, directly affecting the performance stability and reliability of the entire gutta-percha filling device.

[0010] In contrast, the manual crimping assembly method used in this device is extremely simple to operate. Operators only need brief training to quickly master the method, greatly reducing the reliance on operators' specialized skills. Simultaneously, this assembly method effectively avoids various problems that may arise during welding, ensuring the stability and reliability of the connection between the steel ball and the fixing sleeve. This not only helps improve the overall quality of the product and ensures the performance of the gutta-percha filling device in actual use, but also significantly improves production efficiency and reduces production delays caused by welding problems. Moreover, the manual crimping assembly method does not interfere with the operator's normal operating procedures due to welding-related factors, effectively ensuring efficient and smooth production operations.

[0011] Preferably, the transmission assembly includes a rotating sleeve, a screw, and a guide seat. The rotating sleeve is circumferentially fixed to the output shaft of the drive motor via a radial pin, and a central threaded hole is machined in the center of the rotating sleeve. The outer surface of the screw mates with the central threaded hole. The guide seat is installed on the inner wall of the housing, and the inner wall has two symmetrically distributed straight guide grooves along the axial direction. The push rod has a radially protruding guide pin on its side wall. The straight guide grooves and guide pins form a clearance fit. When the drive motor drives the rotating sleeve to rotate, the screw tends to rotate under the side effect of the central thread, while the fit between the guide pin and the straight guide groove constrains the rotation of the screw, converting the rotational motion of the rotating sleeve into a pure axial linear displacement of the push rod.

[0012] The rotating sleeve is circumferentially fixed to the output shaft of the drive motor via radial pins. This connection method is structurally robust, precise, and reliable. The radial pins effectively transmit torque, ensuring synchronous rotation between the rotating sleeve and the drive motor output shaft. This avoids power transmission loss or instability caused by loose connections, significantly improving power transmission efficiency and accuracy, and providing a solid foundation for the stable operation of the entire device. The central threaded hole machined in the center of the rotating sleeve mates with the outer surface of the screw. This ingenious threaded drive structure not only effectively converts the rotational motion output by the drive motor into linear motion to meet the needs of the push rod pushing the gutta-percha for filling, but also provides excellent self-locking performance. When the device stops working, it prevents the screw from rotating on its own due to external forces, ensuring the stability of the push rod position and thus guaranteeing precise control of the gutta-percha filling amount, improving the product's performance and accuracy. The guide seat is installed on the inner wall of the housing, and the inner wall has two symmetrically distributed linear guide grooves along the axial direction. These grooves form a clearance fit with the radially protruding guide pins on the side wall of the push rod. This design plays a crucial guiding and limiting role. Two symmetrically distributed linear guide grooves precisely guide the linear motion trajectory of the push rod, ensuring smooth axial movement and preventing deviation or wobbling during movement. This guarantees the accuracy and stability of gutta-percha filling. Simultaneously, the clearance fit between the guide pin and the guide groove ensures smooth sliding of the push rod and compensates for manufacturing and assembly errors to a certain extent, improving the adaptability and reliability of the entire transmission assembly.

[0013] Preferably, the injection needle assembly is detachably mounted on the front end of the housing, and the injection needle assembly further includes an injection needle housing detachably connected to the housing, with the gutta-percha tank disposed within the injection needle housing; wherein, the gutta-percha tank is coaxially sleeved within the metal heat-conducting cylinder, and an axial sliding clearance fit is formed between the outer wall of the gutta-percha tank and the inner wall of the metal heat-conducting cylinder, and this clearance fit structure allows the injection needle assembly to be separated from the metal heat-conducting cylinder by axial relative displacement.

[0014] Maintaining the cleanliness and hygiene of medical devices is crucial during use, directly impacting patient health and safety. Traditional integrated devices often face numerous challenges in cleaning, making it difficult to thoroughly clean all parts. In this device, however, the gutta-percha tank and injection needle can be easily detached from the outer casing. Furthermore, a unique axial sliding clearance between the gutta-percha tank and the metal heat-conducting cylinder allows for further separation from the cylindrical heating component. This feature enables operators to thoroughly clean and maintain the gutta-percha tank and injection needle without any blind spots, effectively preventing clogging and contamination caused by residual gutta-percha and impurities. This significantly extends the device's lifespan and reduces the medical risks such as infection caused by unclean equipment. Because the gutta-percha tank and injection needle are separable from other components, they can be washed with water. Water washing, a common and effective cleaning method, utilizes the flushing action of water to quickly and thoroughly remove various stains adhering to the surface and internal channels of the gutta-percha tank and injection needle. Compared to some devices that can only be cleaned through limited methods such as wiping, water washing can remove stubborn stains more deeply, ensuring a higher standard of cleaning. Moreover, the water washing process is relatively simple to operate, requiring no complex tools or professional skills, thus reducing the difficulty and cost of cleaning. Furthermore, when the gutta-percha tank or injection needle is damaged or worn out, there is no need for large-scale disassembly and replacement of the entire device; only the corresponding parts need to be disassembled and replaced individually, greatly improving maintenance efficiency and reducing maintenance costs. At the same time, different models of gutta-percha tanks and injection needles can be easily replaced to meet different types or sizes of gutta-percha filling needs, enhancing the equipment's versatility and applicability.

[0015] Preferably, the metal heat-conducting cylinder has a radially extending outward flange at one end near the pushing mechanism, and also includes an anti-leakage adhesive assembly. The anti-leakage adhesive assembly includes an anti-leakage adhesive shell, a sealing ring, and a clamping ring. The anti-leakage adhesive shell is connected to the outer shell. The sealing ring is embedded in the annular groove of the anti-leakage adhesive shell and forms a compression seal with the first side of the outward flange of the metal heat-conducting cylinder. The clamping ring is pressed onto the second side of the outward flange by circumferentially distributed fastening bolts. The outward flange is clamped between the sealing ring and the clamping ring to form an axial sealing interface. The anti-leakage adhesive shell has an array of threaded holes that mate with the fastening bolts.

[0016] The sealing rings and clamping rings are made of PEEK wear-resistant material. PEEK possesses extremely high wear resistance, effectively resisting wear caused by friction during long-term, frequent use, significantly extending the service life of the sealing rings and clamping rings. Compared to ordinary materials, its wear resistance allows these components to maintain good physical form and sealing performance even when subjected to various forces generated during device operation, ensuring the leak-proof assembly always functions stably and reliably, reducing the risk of leakage due to component wear, and guaranteeing the accuracy and hygiene of gutta-percha filling operations. Furthermore, PEEK material has excellent chemical stability. It can withstand the erosion of various chemicals and is not prone to chemical reactions with gutta-percha or other substances it may come into contact with. This not only helps maintain the stability of the component's own performance but also avoids sealing failure caused by chemical corrosion, further improving the reliability and durability of the device. In terms of assembly, the clamping rings are assembled and fixed to the metal heat-conducting cylinder using bolts, demonstrating a clear advantage. This assembly method is extremely simple and convenient. During the manufacturing process, operators only need to align the clamping ring with the outer edge of the metal heat-conducting cylinder and tighten the circumferentially distributed fastening bolts to easily complete the assembly. Compared to some complex connection methods, such as welding or special snap-fit ​​connections, bolted connections do not require complex tools or professional skills, reducing assembly difficulty and improving production efficiency. At the same time, bolted connections offer excellent repeatability and disassembly. During later maintenance and repair of the equipment, if it is necessary to inspect, replace, or adjust the anti-leakage adhesive component, simply unscrewing the bolts allows for easy disassembly and reinstallation of the clamping ring, significantly shortening maintenance time, reducing maintenance costs, and improving the maintainability of the equipment.

[0017] Preferably, the heating element is a heating wire, which is spot-welded to a metal heat-conducting cylinder.

[0018] As a mature and widely used heating element, the heating wire possesses excellent resistance characteristics, effectively converting electrical energy into heat energy when energized, providing a stable and continuous heat source for the gutta-percha filling device. Its high heating efficiency rapidly raises the temperature of the metal heat-conducting cylinder, thereby achieving efficient heating of the gutta-percha and meeting the temperature requirements of gutta-percha filling operations. Spot welding instantly melts and fuses the contact area between the heating wire and the metal heat-conducting cylinder with a powerful current, forming a strong connection. The high strength of the spot weld joint can withstand external forces such as vibration and temperature changes during device operation, ensuring the stability and reliability of the connection between the heating wire and the metal heat-conducting cylinder. This effectively avoids problems such as uneven heating or open circuits caused by loose connections, extending the service life of the entire heating system and improving the overall performance of the device.

[0019] Preferably, the outer surface of the rotating sleeve is circumferentially distributed with multiple permanent magnets.

[0020] The arrangement of permanent magnets can create a specific magnetic field environment around the rotating sleeve. The magnetic field generated by the permanent magnets can work in coordination with certain electronic components or sensors inside or outside the device, and realize signal transmission or trigger specific functions through magnetic field induction, providing new ways and possibilities for the intelligent control and monitoring of the device.

[0021] Preferably, it also includes a bearing and a bearing housing, wherein the inner ring of the bearing is fitted onto the rotating sleeve, and the bearing housing is connected to the housing and fits into the outer ring of the bearing.

[0022] The presence of bearings significantly reduces the frictional resistance between the rotating sleeve and the outer shell, allowing the rotating sleeve to rotate more smoothly and steadily under the drive motor. This not only improves transmission efficiency and reduces energy loss but also reduces heat and noise generated by friction, enhancing the device's operational performance and user experience. The bearing housing provides a stable and reliable support structure for the bearings, and its connection to the outer shell ensures the secure installation of the entire transmission system within the device. By rationally designing the connection method between the bearing housing and the outer shell, as well as the fitting precision with the bearing outer ring, the radial and axial loads generated during the rotation of the rotating sleeve can be effectively withstood, ensuring the stability and reliability of the transmission system. This structural design allows the device to better maintain the relative positional accuracy between components during long-term operation, preventing component displacement or shaking from affecting the normal operation of the device, thus providing a solid guarantee for the efficient and stable operation of the device.

[0023] Preferably, the leak-proof housing is locked and fixed to the bearing seat by radial pins.

[0024] The radial pin fixing method provides a reliable and stable connection, ensuring the relative position between the leak-proof housing and the bearing seat remains stable. During device operation, regardless of vibration, impact, or other external forces, the radial pin effectively prevents the leak-proof housing from shifting or loosening, thus guaranteeing the sealing and functionality of the leak-proof assembly. Compared to other connection methods, such as bolted connections or welding, this fixing method is easier to install and disassemble. During equipment production and assembly, the radial pin allows for rapid installation of the leak-proof housing, improving production efficiency. During maintenance and repair, the pin can be easily removed for inspection, replacement, or repair of the leak-proof assembly, reducing maintenance costs and difficulty. Furthermore, the radial pin structure is relatively simple, occupies little space, and does not significantly increase the device's size and weight, which helps optimize the overall structural design of the device, improving its compactness and portability.

[0025] Preferably, the metal heat-conducting cylinder is provided with a heat-insulating sleeve on its outer periphery.

[0026] The main function of the heat insulation sleeve is to effectively reduce heat loss from the metal heat-conducting cylinder to the surrounding environment, thereby improving heat utilization efficiency. By concentrating most of the heat inside the metal heat-conducting cylinder, the gutta-percha can be heated more efficiently, ensuring that the gutta-percha maintains a suitable temperature during filling and improving the quality and effect of the filling. Simultaneously, the heat insulation sleeve also protects operators and surrounding equipment. Because the surface temperature of the metal heat-conducting cylinder is high during heating, the heat insulation sleeve lowers its surface temperature, preventing operators from accidentally coming into contact with the hot surface and suffering burns, thus ensuring operator safety. Furthermore, the heat insulation sleeve helps optimize the energy consumption of the device, reducing unnecessary heat waste, which aligns with the modern industrial demand for energy-saving and environmentally friendly products.

[0027] Preferably, the heat insulation sleeve is threadedly connected to the leak-proof adhesive shell.

[0028] Threaded connections are a widely used and mature connection method, providing a reliable and tight connection between the insulation sleeve and the leak-proof housing. Through the engagement of the threads, the insulation sleeve is firmly fixed to the leak-proof housing, ensuring that it will not loosen or fall off due to vibration, temperature changes, or other factors during operation, effectively guaranteeing the insulation performance of the insulation sleeve and the stability of the overall structure.

[0029] The advantages of this utility model compared to the prior art are:

[0030] The gutta-percha filling device of this utility model uses a manual pressing assembly method to assemble the steel ball and the fixing sleeve, thereby completing the assembly of the push rod. This design has many outstanding advantages.

[0031] Compared to traditional special welding methods, this hand-pressed assembly method exhibits significant advantages. Because push rods and screws are typically made of different materials—for example, push rods are often made of ceramic, while screws are mostly made of metal or plastic—this material difference necessitates a special welding process to connect them. This special welding not only requires complex and specialized welding equipment but also demands extremely high skill levels from the operators; only welders with extensive professional training can perform this work. Furthermore, the special welding process generates a series of potential hazards, such as intense light that can damage the operator's eyes and the release of harmful gases that can seriously threaten the operator's health. More importantly, even with professional skills, slight carelessness during actual operation can lead to inconsistent welding quality, directly affecting the performance stability and reliability of the entire gutta-percha filling device.

[0032] In contrast, the manual crimping assembly method used in this device is extremely simple to operate. Operators only need brief training to quickly master the method, greatly reducing the reliance on operators' specialized skills. Simultaneously, this assembly method effectively avoids various problems that may arise during welding, ensuring the stability and reliability of the connection between the steel ball and the fixing sleeve. This not only helps improve the overall quality of the product and ensures the performance of the gutta-percha filling device in actual use, but also significantly improves production efficiency and reduces production delays caused by welding problems. Moreover, the manual crimping assembly method does not interfere with the operator's normal operating procedures due to welding-related factors, effectively ensuring efficient and smooth production operations. Attached Figure Description

[0033] 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.

[0034] Figure 1 This is a three-dimensional structural diagram of a gutta-percha filling device according to an embodiment of the present invention.

[0035] Figure 2 This is a cross-sectional view of a gutta-percha filling device according to an embodiment of the present invention.

[0036] Figure 3 This is a cross-sectional view of another aspect of a gutta-percha filling device according to an embodiment of the present invention.

[0037] Figure 4 for Figure 2 A magnified view of region A in the middle.

[0038] Figure 5 for Figure 2 A magnified view of region B in the middle.

[0039] Label Explanation

[0040] Outer shell (1).

[0041] Drive motor (2).

[0042] Pushing mechanism (3), transmission assembly (31), rotating sleeve (311), radial pin (312), central threaded hole (313), guide seat (314), straight guide groove (315), guide pin (316), permanent magnet (317), screw (32), push rod (33), crimping connection assembly (34), radial through hole (341), steel ball (342), fixed sleeve (343), annular groove (344).

[0043] Cylindrical heating assembly (4), metal heat-conducting cylinder (41), and outward flange (43).

[0044] The components are: injection needle assembly (5), gutta-percha tank (51), injection needle (52), and injection needle housing (53).

[0045] Leak-proof adhesive assembly (6), leak-proof adhesive housing (61), sealing ring (62), annular groove (63), clamping ring (64), fastening bolt (65).

[0046] Bearing (7).

[0047] Bearing housing (8).

[0048] Insulation sleeve (9). Detailed Implementation

[0049] 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.

[0050] 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.

[0051] 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.

[0052] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0053] The technical solutions in this application will now be described with reference to the accompanying drawings.

[0054] This embodiment provides a gutta-percha filling device, including a housing 1, a cylindrical heating assembly 4, an electric heating element on the outer surface, and a glue injection needle assembly 52. ​​The housing 1 contains a drive motor 2 and a pushing mechanism 3 connected to the output shaft of the drive motor 2. The cylindrical heating assembly 4 includes a metal heat-conducting cylinder 41 fixedly connected to the housing 1 and an electric heating element spirally wound around the outer surface of the metal heat-conducting cylinder 41. The electric heating element is electrically connected to a power supply circuit inside the housing 1. The glue injection needle assembly 52 includes a gutta-percha tank 51, with a glue injection needle 52 connected to the end of the tank. The pushing mechanism 3 includes a transmission assembly 31 and a push rod 33. The transmission assembly 31 drives the rotational motion... The displacement is converted into linear displacement, which has a screw 32 that moves linearly; the push rod 33 is rigidly connected to the screw 32 through a crimping connection assembly 34, and the end of the push rod 33 extends into the inner cavity of the gutta-percha 51 and forms a material pushing cooperation with the injection needle 52; the crimping connection assembly 34 includes a plurality of radially through holes 341 that are evenly distributed circumferentially at the end of the screw 32, steel balls 342 that are housed in the radially through holes 341, a fixing sleeve 343 that is press-fitted to the end of the screw 32, and an annular groove 344 that is carved at the front end of the push rod 33. The inner surface of the fixing sleeve 343 and the annular groove 344 respectively contact the steel balls 342 and hold the steel balls 342 tightly.

[0055] In this gutta-percha filling device, the crimping connection component 34 is assembled with the steel ball 342 and the fixed sleeve 343 by hand crimping, thereby completing the assembly of the push rod 33. This design has many outstanding advantages.

[0056] Compared to traditional special welding methods, this hand-pressed assembly method exhibits significant advantages. Because the push rod 33 and screw 32 are typically made of different materials—for example, the push rod 33 is often made of ceramic, while the screw 32 is mostly made of metal or plastic—this material difference necessitates a special welding process to connect them. This special welding not only requires complex and specialized welding equipment but also demands extremely high skill levels from the operators; only welders with extensive professional training can perform this work. Furthermore, the special welding process generates a series of potential hazards, such as intense light that may damage the operator's eyes and the release of harmful gases that can seriously threaten the operator's health. More importantly, even with professional skills, slight carelessness during actual operation can lead to inconsistent welding quality, directly affecting the performance stability and reliability of the entire gutta-percha filling device.

[0057] In contrast, the manual crimping assembly method used in this device is extremely simple to operate. Operators only need brief training to quickly master the method, greatly reducing the reliance on operators' professional skills. Simultaneously, this assembly method effectively avoids various problems that may occur during welding, ensuring the stability and reliability of the connection between the steel ball 342 and the fixing sleeve 343. This not only helps improve the overall quality of the product and ensures the performance of the gutta-percha filling device in actual use, but also significantly improves production efficiency and reduces production delays caused by welding problems. Moreover, the manual crimping assembly method does not interfere with the operator's normal operating procedures due to welding-related factors, effectively ensuring efficient and smooth production operations.

[0058] In this embodiment, the transmission assembly 31 includes a rotating sleeve 311, a screw 32, and a guide seat 314. The rotating sleeve 311 is circumferentially fixed to the output shaft of the drive motor 2 via a radial pin 312. A central threaded hole 313 is machined in the center of the rotating sleeve 311. The outer surface of the screw 32 mates with the central threaded hole 313. The guide seat 314 is installed on the inner wall of the outer casing 1, and two symmetrically distributed straight guide grooves 315 are provided on the inner wall along the axial direction. The push rod 33 has a radially protruding guide pin 316 on its side wall. The straight guide grooves 315 and the guide pins 316 form a clearance fit. When the drive motor 2 drives the rotating sleeve 311 to rotate, the screw 32 generates a rotational tendency under the side effect of the central thread. The fit between the guide pins 316 and the straight guide grooves 315 constrains the rotation of the screw 32, converting the rotational motion of the rotating sleeve 311 into a pure axial linear displacement of the push rod 33.

[0059] The rotating sleeve 311 is circumferentially fixed to the output shaft of the drive motor 2 via a radial pin 312. This connection method is structurally robust and highly reliable. The radial pin 312 effectively transmits torque, ensuring that the rotating sleeve 311 rotates synchronously with the output shaft of the drive motor 2. This avoids power transmission loss or instability caused by loose connections, greatly improving the efficiency and accuracy of power transmission and providing a solid foundation for the stable operation of the entire device. The central threaded hole 313 machined in the center of the rotating sleeve 311 mates with the outer surface of the screw 32. This threaded transmission structure is ingeniously designed. It not only effectively converts the rotational motion output by the drive motor 2 into linear motion to meet the needs of the push rod 33 pushing the gutta-percha for filling, but also has excellent self-locking performance. When the device stops working, it prevents the screw 32 from rotating on its own due to external forces, ensuring the stability of the push rod 33's position, thereby ensuring precise control of the gutta-percha filling amount and improving the product's performance and accuracy. The guide seat 314 is mounted on the inner wall of the housing 1, and the inner wall has two symmetrically distributed linear guide grooves 315 along the axial direction. These grooves form a clearance fit with the radially protruding guide pin 316 on the side wall of the push rod 33. This design plays a crucial guiding and limiting role. The two symmetrically distributed linear guide grooves 315 can accurately guide the linear movement trajectory of the push rod 33, ensuring that the push rod 33 moves smoothly in the axial direction and preventing the push rod 33 from deviating or wobbling during movement, thereby ensuring the accuracy and stability of gutta-percha filling. At the same time, the clearance fit between the guide pin 316 and the guide groove can not only ensure the smooth sliding of the push rod 33, but also compensate for manufacturing and assembly errors to a certain extent, improving the adaptability and reliability of the entire transmission assembly 31.

[0060] In this embodiment, the injection needle 52 assembly 5 is detachably installed on the front end of the outer shell 1. The injection needle 52 assembly 5 also includes an injection needle housing 53 detachably connected to the outer shell 1, and a gutta-percha tank 51 is disposed in the injection needle housing 53. The gutta-percha tank 51 is coaxially sleeved inside the metal heat-conducting cylinder 41, and an axial sliding clearance fit is formed between the outer wall of the gutta-percha tank 51 and the inner wall of the metal heat-conducting cylinder 41. This clearance fit structure allows the injection needle 52 assembly 5 to be separated from the metal heat-conducting cylinder 41 by axial relative displacement.

[0061] Maintaining the cleanliness and hygiene of medical devices is crucial during use, directly impacting patient health and safety. Traditional integrated devices often face numerous challenges in cleaning, making it difficult to thoroughly clean all parts. However, in this device, the gutta-percha tank 51 and injection needle 52 can be easily detached from the outer casing 1. Furthermore, a unique axial sliding clearance fit between the gutta-percha tank 51 and the metal heat-conducting cylinder 41 allows for further separation from the cylindrical heating assembly 4. This feature enables operators to comprehensively and thoroughly clean and maintain the gutta-percha tank 51 and injection needle 52, effectively preventing clogging and contamination caused by residual gutta-percha and impurities, significantly extending the device's lifespan, and reducing medical risks such as infection due to unclean equipment. Because the gutta-percha tank 51 and injection needle 52 are separable from other components, they can be washed with water. Water washing, a common and effective cleaning method, utilizes the flushing action of water to quickly and thoroughly remove various stains adhering to the surface and internal channels of the gutta-percha tank 51 and injection needle 52. Compared to some devices that can only be cleaned through limited methods such as wiping, water washing can remove stubborn stains more thoroughly, ensuring a higher standard of cleaning. Moreover, the water washing process is relatively simple, requiring no complex tools or professional skills, reducing the difficulty and cost of cleaning work. Furthermore, when the gutta-percha tank 51 or the dispensing needle 52 is damaged or worn, there is no need for large-scale disassembly and replacement of the entire device; only the corresponding parts need to be disassembled and replaced individually, greatly improving maintenance efficiency and reducing maintenance costs. At the same time, different models of gutta-percha tanks 51 and dispensing needles 52 can be easily replaced for different types or sizes of gutta-percha filling needs, enhancing the versatility and applicability of the equipment.

[0062] In this embodiment, the metal heat-conducting cylinder 41 has a radially extending outward flange 43 at one end near the pushing mechanism 3, and also includes an anti-leakage adhesive assembly 6. The anti-leakage adhesive assembly 6 includes an anti-leakage adhesive housing 61, a sealing ring 62, and a clamping ring 64. The anti-leakage adhesive housing 61 is connected to the outer shell 1. The sealing ring 62 is embedded in the annular groove 63 of the anti-leakage adhesive housing 61, forming a compression seal with the first side of the outward flange 43 of the metal heat-conducting cylinder 41. The clamping ring 64 is pressed against the second side of the outward flange 43 by circumferentially distributed fastening bolts 65. The outward flange 43 is clamped between the sealing ring 62 and the clamping ring 64 to form an axial sealing interface. The anti-leakage adhesive housing 61 has an array of threaded holes that mate with the fastening bolts 65. In this embodiment, the anti-leakage adhesive housing 61 and the guide seat 314 are integrally formed.

[0063] The sealing ring 62 and clamping ring 64 are made of PEEK wear-resistant material. PEEK material possesses extremely high wear resistance, effectively resisting wear caused by friction during long-term, frequent use, significantly extending the service life of the sealing ring 62 and clamping ring 64. Compared to ordinary materials, its wear resistance allows these components to maintain good physical form and sealing performance even when subjected to various forces generated during device operation, ensuring the leak-proof adhesive assembly 6 always functions stably and reliably, reducing the risk of adhesive leakage due to component wear, and guaranteeing the accuracy and hygiene of gutta-percha filling operations. Furthermore, PEEK material has excellent chemical stability. It can withstand the erosion of various chemicals and is not prone to chemical reactions with gutta-percha or other substances it may come into contact with. This not only helps maintain the stability of the component's own performance but also avoids sealing failure caused by chemical corrosion, further improving the reliability and durability of the device. In terms of assembly, the clamping ring 64 exhibits a clear advantage by being assembled and fixed to the metal heat-conducting cylinder 41 with bolts. This assembly method is extremely simple and convenient. During the manufacturing process, operators only need to align the clamping ring 64 with the outer flange 43 of the metal heat-conducting cylinder 41 and tighten the circumferentially distributed fastening bolts 65 to easily complete the assembly. Compared to some complex connection methods, such as welding or special snap-fit ​​connections, bolted connections do not require complex tools or professional skills, reducing assembly difficulty and improving production efficiency. At the same time, bolted connections have good repeatability and disassembly. During the later maintenance and repair of the equipment, if it is necessary to inspect, replace, or adjust the anti-leakage adhesive component 6, simply unscrew the bolts to easily disassemble and reinstall the clamping ring 64, greatly shortening maintenance time, reducing maintenance costs, and improving the maintainability of the equipment.

[0064] In this embodiment, the heating element is a heating wire, which is spot-welded to the metal heat-conducting cylinder 41.

[0065] As a mature and widely used heating element, the heating wire possesses excellent resistance characteristics, effectively converting electrical energy into heat energy when energized, providing a stable and continuous heat source for the gutta-percha filling device. Its high heating efficiency rapidly raises the temperature of the metal heat-conducting cylinder 41, thereby achieving efficient heating of the gutta-percha and meeting the temperature requirements of gutta-percha filling operations. Spot welding instantly melts and fuses the contact area between the heating wire and the metal heat-conducting cylinder 41 with a powerful current, forming a strong connection. The weld joint formed by spot welding has high strength, capable of withstanding external forces such as vibration and temperature changes during device operation, ensuring the stability and reliability of the connection between the heating wire and the metal heat-conducting cylinder 41. This effectively avoids problems such as uneven heating or open circuits caused by loose connections, extending the service life of the entire heating system and improving the overall performance of the device.

[0066] In this embodiment, a plurality of permanent magnets 317 are evenly distributed circumferentially on the outer surface of the rotating sleeve 311.

[0067] The arrangement of permanent magnets 317 can create a specific magnetic field environment around the rotating sleeve 311. The magnetic field generated by permanent magnets 317 can work in coordination with certain electronic components or sensors inside or outside the device, and realize signal transmission or trigger specific functions through magnetic field induction, providing new ways and possibilities for intelligent control and monitoring of the device.

[0068] In this embodiment, a bearing 7 and a bearing housing 8 are also included. The inner ring of the bearing 7 is fitted onto the rotating sleeve 311, and the bearing housing 8 is connected to the outer shell 1 and engages with the outer ring of the bearing 7.

[0069] The presence of bearing 7 significantly reduces the frictional resistance between the rotating sleeve 311 and the outer shell 1, allowing the rotating sleeve 311 to rotate more smoothly and steadily under the drive of the motor 2. This not only improves transmission efficiency and reduces energy loss but also reduces heat and noise generated by friction, enhancing the device's operational performance and user experience. The bearing housing 8 provides a stable and reliable support structure for bearing 7, and its connection to the outer shell 1 ensures the secure installation of the entire transmission system within the device. Through a rational design of the connection between bearing housing 8 and the outer shell 1, as well as the fitting precision with the outer ring of bearing 7, the radial and axial loads generated by the rotating sleeve 311 during rotation can be effectively withstood, ensuring the stability and reliability of the transmission system. This structural design allows the device to better maintain the relative positional accuracy between components during long-term operation, preventing component displacement or shaking from affecting the normal operation of the device, thus providing a solid guarantee for the efficient and stable operation of the device.

[0070] In this embodiment, the leak-proof housing 61 is locked and fixed to the bearing seat 8 by a radial pin.

[0071] The radial pin fixing method provides a reliable and stable connection, ensuring the relative position between the leak-proof housing 61 and the bearing seat 8 remains stable. During device operation, regardless of vibration, impact, or other external forces, the radial pin effectively prevents the leak-proof housing 61 from shifting or loosening, thus guaranteeing the sealing and functionality of the leak-proof assembly 6. Compared to other connection methods, such as bolted connections or welding, this fixing method is easier to install and disassemble. During equipment production and assembly, the radial pin allows for quick installation of the leak-proof housing 61, improving production efficiency. During equipment maintenance and repair, the pin can be easily removed for inspection, replacement, or repair of the leak-proof assembly 6, reducing maintenance costs and difficulty. Furthermore, the radial pin structure is relatively simple, occupies little space, and does not significantly increase the device's size and weight, which helps optimize the overall structural design of the device, improving its compactness and portability.

[0072] In this embodiment, a heat insulation sleeve 9 is provided on the outer periphery of the metal heat-conducting cylinder 41.

[0073] The main function of the heat insulation sleeve 9 is to effectively reduce heat loss from the metal heat-conducting cylinder 41 to the surrounding environment, thereby improving heat utilization efficiency. By concentrating most of the heat inside the metal heat-conducting cylinder 41, the gutta-percha can be heated more efficiently, ensuring that the gutta-percha maintains a suitable temperature during filling and improving the quality and effect of gutta-percha filling. Simultaneously, the heat insulation sleeve 9 also protects operators and surrounding equipment. Since the surface temperature of the metal heat-conducting cylinder 41 is high during heating, the heat insulation sleeve 9 can reduce its surface temperature, preventing operators from accidentally coming into contact with the high-temperature surface and suffering burns, thus ensuring operator safety. Furthermore, the heat insulation sleeve 9 helps optimize the energy consumption of the device, reducing unnecessary heat waste, which meets the modern industrial requirements for energy-saving and environmentally friendly products.

[0074] In this embodiment, the heat insulation sleeve 9 is threadedly connected to the leak-proof adhesive shell 61.

[0075] Threaded connection is a widely used and mature connection method, providing a reliable and tight connection between the heat insulation sleeve 9 and the leak-proof housing 61. By screwing the threads on, the heat insulation sleeve 9 can be firmly fixed to the leak-proof housing 61, ensuring that the heat insulation sleeve 9 will not loosen or fall off due to vibration, temperature changes, or other factors during the operation of the device, effectively guaranteeing the heat insulation performance of the heat insulation sleeve 9 and the stability of the overall structure.

[0076] 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 gutta-percha filling device, characterized in that, include: The outer casing (1) is equipped with a drive motor (2) and a pushing mechanism (3) that is connected to the output shaft of the drive motor. The cylindrical heating assembly (4) includes a metal heat-conducting cylinder (41) fixedly connected to the outer shell (1) and an electric heating element (42) spirally wound on the outer surface of the metal heat-conducting cylinder. The electric heating element (42) is electrically connected to the power supply circuit inside the outer shell (1). The dispensing needle assembly (5) includes a gutta-percha tank (51) with a dispensing needle (52) connected to the end of the gutta-percha tank (51). The pushing mechanism (3) includes: The transmission assembly (31) converts rotational motion into linear displacement and has a screw (32) that makes linear movement. The push rod (33) is rigidly connected to the screw (32) through the crimping connection assembly (34). The end of the push rod (33) extends into the inner cavity of the gutta-percha (51) and forms a material pushing cooperation with the dispensing needle (52). The crimping connection assembly (34) includes a plurality of radial through holes (341) evenly distributed around the end of the screw (32), a steel ball (342) housed in the radial through holes (341), a fixing sleeve (343) press-fitted to the end of the screw (32), and an annular groove (344) carved at the front end of the push rod (33). The inner surface of the fixing sleeve (343) and the annular groove (344) respectively contact and hold the steel ball (342).

2. The gutta-percha filling device according to claim 1, characterized in that, The transmission assembly (31) includes: The rotating sleeve (311) is circumferentially fixed to the output shaft of the drive motor by means of a radial pin (312), and the rotating sleeve (311) has a central threaded hole (313) machined in the center. The screw (32) has an outer surface that mates with the central threaded hole (313); The guide seat (314) is installed on the inner wall of the outer shell (1) and the inner wall is provided with two symmetrically distributed straight guide grooves (315) along the axial direction. The push rod (33) has a radially protruding guide pin (316) on its side wall. The straight guide groove (315) and the guide pin (316) form a clearance fit. When the drive motor (2) drives the rotating sleeve (311) to rotate, the screw (32) generates a rotational tendency under the side effect of the central threaded hole (313). The fit between the guide pin (316) and the straight guide groove (315) constrains the rotation of the screw (32), converting the rotational motion of the rotating sleeve (311) into the pure axial linear displacement of the push rod (33).

3. The gutta-percha filling device according to claim 1, characterized in that, The injection needle assembly (5) is detachably installed at the front end of the outer shell (1). The injection needle assembly (5) also includes an injection needle housing (53) detachably connected to the outer shell (1). The gutta-percha (51) is disposed in the injection needle housing (53). The gutta-percha (51) is coaxially sleeved inside the metal heat-conducting cylinder (41). An axial sliding clearance fit (54) is formed between the outer wall of the gutta-percha (51) and the inner wall of the metal heat-conducting cylinder (41). This clearance fit structure allows the injection needle assembly (5) to be separated from the metal heat-conducting cylinder (41) by axial relative displacement.

4. The gutta-percha filling device according to claim 1, characterized in that, The metal heat-conducting cylinder (41) has a radially extending outward flange (43) at one end near the pushing mechanism (3), and also includes an anti-leakage adhesive assembly (6), which includes: Leak-proof adhesive housing (61), which is connected to the outer shell (1); The sealing ring (62) is embedded in the annular groove (63) of the leak-proof glue shell (61) and forms a compression seal with the first side of the outer flange (43) of the metal heat-conducting cylinder (41); A clamping ring (64) is pressed against the second side of the outer flange (43) by circumferentially distributed fastening bolts (65); The outer flange (43) is clamped between the sealing ring (62) and the clamping ring (64) to form an axial sealing interface, and the anti-leakage housing (61) is provided with an array of threaded holes (66) that cooperate with the fastening bolts (65).

5. The gutta-percha filling device according to claim 1, characterized in that, The heating element (42) is a heating wire (421) which is spot-welded to the metal heat-conducting cylinder (41) (422).

6. The gutta-percha filling device according to claim 2, characterized in that, The outer surface of the rotating sleeve (311) is evenly distributed with multiple permanent magnets (317).

7. The gutta-percha filling device according to claim 1, characterized in that, It also includes a bearing (7) and a bearing housing (8), wherein the inner ring of the bearing (7) is fitted onto the rotating sleeve (311), and the bearing housing (8) is connected to the outer shell (1) and engages with the outer ring of the bearing (7).

8. The gutta-percha filling device according to claim 4, characterized in that, The leak-proof housing (61) is locked and fixed to the bearing seat (8) by a radial pin (67).

9. The gutta-percha filling device according to claim 1, characterized in that, The metal heat-conducting cylinder (41) is provided with a heat insulation sleeve (9) on its outer periphery.

10. The gutta-percha filling device according to claim 9, characterized in that, The heat insulation sleeve (9) is threaded (91) to the leak-proof glue shell (61).

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