Root canal filling needle and root canal filling device

Abstract

The invention discloses a root canal filling needle head and a root canal filling device, the needle head comprises a needle tube and a handle body, the needle tube is provided with a far end and a near end connected with the handle body, the needle tube is provided with a flow channel penetrating through the far end and the near end, and the needle tube is provided with a guide reinforcing tube; the filling device comprises a pressure generator and the root canal filling needle, and the pressure generator provides positive pressure or negative pressure for the interior of the needle tube flow channel. The guide reinforcing tube is arranged on the needle tube to increase hardness, so that the needle tube can be inserted into the tail end of the bent root canal more smoothly; the root canal is vacuumized by utilizing the needle head, so that the whole root canal can be filled with a root canal sealing agent, and the probability of underfilling or overfilling is reduced; by arranging the pressure detection device, the pressure in the needle tube can be maintained at a set value through negative feedback adjustment, bubbles generated during root canal filling are effectively reduced, the needle tube is prevented from being blocked, and the filling effect is improved.

Description

Technical Field

[0001] The invention relates to the technical field of oral root canal filling, and in particular to a root canal filling needle and a root canal filling device. Background Art

[0002] Root canal filling is a key step in root canal treatment. Strict root canal filling can not only prevent the occurrence of apical periodontitis, but also promote its healing, thus achieving the ultimate goal of root canal treatment. The existing root canal filling methods generally introduce root canal sealers through screw conveyors, gutta-percha points or root canal files, and then use lateral pressure method, hot pressurized glue vertical pressure method, single-point filling method and other methods combined with gutta-percha points to fill the root canals. The current filling technology has problems such as overfilling (filling material exceeds the apical foramen) or underfilling (filling material is shorter than the root canal length or the filling is not dense, such as the presence of bubbles, etc.). Studies have found that overfilling and underfilling will lead to a lower success rate of root canal treatment. For example, the success rate of root canal treatment is 81% when properly filled, while the success rates of overfilling and underfilling are only 66% and 76% respectively.

[0003] The use of positive and negative pressures during root canal filling can improve the effect of root canal filling. After placing the root canal sealer in the upper part of the root canal, insert the needle and apply positive pressure to prevent the needle from being blocked; after starting the negative pressure, the air in the root canal is extracted, and the root canal sealer will flow toward the apex under the action of negative pressure until the entire length of the root canal, achieving the effect of root canal filling. However, if the supply of positive and negative pressures is unstable during use, for example, when the positive pressure is too high, air will enter the root canal sealer to form bubbles; when the negative pressure is too high, the root canal sealer will flow too fast. When the root canal shape is irregular, the flow of root canal sealers in different parts will also be irregular, resulting in local gaps.

[0004] In order to cooperate with positive and negative pressure filling, a needle that can smoothly enter the root canal and reach the filling stop point is required. The root canal irrigation needles currently used in clinical practice are usually made of stainless steel and austenitic nickel-titanium alloy. Since most root canals are curved, the existing needles are relatively hard and not easy to enter the end of the curved root canal. If a material with good flexibility is used, such as martensitic nickel-titanium alloy, R-phase nickel-titanium alloy, softer stainless steel, aluminum alloy, plastic or silicone, etc., plastic materials such as polypropylene (PP), polysulfone (PSU) and polyphenylsulfone (PPSU), etc., when the diameter of the needle tube is thin, the hardness of the needle tube will be insufficient, and it will be difficult to apply force along the long axis of the needle tube during the insertion of the needle tube. Although the needles prepared by the first two materials can be inserted deeper, they are also not easy to enter the end of the curved root canal. In addition, the irrigation needles are all lateral openings or the tip openings are inclined. During negative pressure filling, the root canal sealer can only reach the upper edge of the needle tube opening, and cannot reach the filling stop point, which leads to loose root canal filling.

[0005] Therefore, in view of the above-mentioned technical problems, it is necessary to make new innovations. Summary of the invention

[0006] The purpose of the present invention is to solve at least one of the deficiencies in the prior art, so a root canal filling needle and a root canal filling device are proposed, and the specific scheme is as follows:

[0007] A root canal filling needle comprises a needle tube and a handle body, wherein the needle tube has a distal end for inserting into the root canal and a proximal end connected to the handle body, a flow channel penetrating the distal end and the proximal end is arranged in the needle tube, and a guide reinforcement tube is arranged on the needle tube near the handle body.

[0008] Furthermore, the needle tube is made of plastic metal, and the distal end of the needle tube can be bent and maintained in the bent state.

[0009] Furthermore, the plastic metal material is a martensitic nickel-titanium alloy material, an R-phase nickel-titanium alloy material, a soft low-elastic stainless steel material or a soft low-elastic aluminum alloy material.

[0010] Furthermore, the needle tube is made of soft non-metallic material.

[0011] Furthermore, the end surface of the distal end is arranged perpendicular to the axis of the needle tube, and the flow channel opening of the flow channel is arranged on the end surface of the distal end.

[0012] Furthermore, a notch is provided at the distal end of the needle tube near the end surface, the notch penetrates the end surface, and the notch is communicated with the flow channel.

[0013] Furthermore, the length of the notch in the axial direction of the needle tube does not exceed 1 mm.

[0014] Furthermore, a positioning block or a scale is also provided on the needle tube.

[0015] Furthermore, the outer diameter of the needle tube is 0.1 mm to 0.35 mm.

[0016] A root canal filling device comprises a pressure generator and the above-mentioned root canal filling needle, wherein the pressure generator is connected to a flow channel opening at the proximal end of the needle tube and can provide positive pressure or negative pressure in the flow channel of the needle tube.

[0017] Furthermore, it also includes a pressure detection device and a controller, the pressure detection device is configured to detect the pressure value in the air path between the pressure generator and the needle tube, the controller is communicatively connected to the pressure generator and the pressure detection device respectively, and the controller is configured to control the operation of the pressure generator according to the pressure value detected by the pressure detection device.

[0018] Furthermore, it includes a picking up detection device, which is communicatively connected to the controller, and is configured to detect the picking up action of the handle body and send a detection signal to the controller. The controller is configured to control the pressure generator to provide positive pressure in the flow channel according to the detection signal.

[0019] Furthermore, it also includes a foot switch, which is communicatively connected to the controller. The controller is configured to obtain a control signal generated by the foot switch after closing and opening, and control the pressure generator to provide positive pressure and / or negative pressure in the flow channel according to the control signal.

[0020] Further, the pressure generator includes a pressure pump, which is connected to the flow channel of the needle tube and can provide positive pressure and / or negative pressure to the flow channel of the needle tube; or the pressure generator includes a tube, a piston and a driver, the piston is arranged in the tube, a chamber is formed between the piston and the tube, the tube is provided with a nozzle connected to the chamber, the nozzle is connected to the flow channel opening at the proximal end of the needle tube, the driver is connected to the controller, and the controller drives the piston to move in the tube by controlling the driver.

[0021] Furthermore, the positive pressure applied to the needle tube is 0.005MPa to 0.08MPa; the negative pressure applied to the needle tube is -0.005MPa to -0.09MPa.

[0022] Compared with the prior art, the root canal filling needle and root canal filling device of the present application have at least one or more of the following beneficial effects:

[0023] (1) The root canal filling needle of the present application increases the hardness by arranging a guide reinforcement tube on the needle tube near the handle body, so that the needle tube can be made of a plastic material with good flexibility such as a martensitic nickel-titanium alloy, an R-phase nickel-titanium alloy, a soft low-elastic stainless steel material, or a soft low-elastic aluminum alloy material, thereby ensuring that the needle tube can be smoothly inserted into the end of the curved root canal;

[0024] (2) The root canal filling needle of the present application has a needle tube made of a molded metal material. When performing root canal filling, the physician can bend the distal end of the needle tube according to the condition of the target root canal. After bending, the distal end of the needle tube will remain in the desired bending state, making it easier for the needle tube to be inserted into the target root canal;

[0025] (3) The root canal filling needle of the present application has an end face at the distal end of the needle tube perpendicular to the needle tube axis, and a flow channel opening is arranged on the end face at the distal end, so that when the distal end of the needle tube is inserted to the ideal filling position, the root canal sealer can also flow into the ideal filling position; a notch can also be arranged at the distal end of the needle tube near the end face, the notch penetrates the end face and communicates with the flow channel, so as to avoid the problem of the needle tube flow channel opening being blocked when the distal end of the needle tube is inserted to the end of the root canal.

[0026] (4) The root canal filling needle of the present application may be provided with a positioning block on the needle tube. When performing root canal filling, the physician may adjust the position of the positioning block according to the condition of the target root canal, thereby assisting the physician in observing the insertion depth of the needle tube when inserting the needle tube;

[0027] (5) The root canal filling device of the present application can use the above-mentioned root canal filling needle to evacuate the target root canal, so that the root canal sealer can fill the entire target root canal, reduce the probability of underfilling or overfilling of the root canal sealer, improve the root canal filling effect and patient comfort, and can also be provided with a pressure detection device, through negative feedback regulation, so that the pressure in the needle tube is always maintained at a set value, thereby effectively reducing the proportion of bubbles generated during the root canal filling process and avoiding needle tube blockage, thereby improving the filling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of the three-dimensional structure of a root canal filling needle provided in Example 1 of the present application;

[0029] Figure 2a for Figure 1 The enlarged schematic diagram of point I in the middle;

[0030] Figure 2b for Figure 1 The root canal filling needle shown is an enlarged schematic diagram of point I when a notch is provided at the distal end of the needle tube near the end surface;

[0031] Figure 3 for Figure 1 The schematic diagram of the main structure of the root canal filling needle shown;

[0032] Figure 4 for Figure 3 A schematic diagram of the cross-sectional structure at the center;

[0033] Figure 5 A schematic diagram of the three-dimensional structure of another root canal filling needle provided in Example 1 of the present application;

[0034] Figure 6 A schematic diagram of the structure of the root canal filling needle provided in Example 1 of the present application when the distal end of the needle tube is in a bent state;

[0035] Figure 7A schematic diagram of the structure of the root canal filling needle provided in Example 1 of the present application when a positioning block is provided on the needle tube;

[0036] Figure 8 This is a rendering of the simulation of the needle tube inserted into the root canal when the needle tube is made of austenitic nickel-titanium alloy provided in Example 2 of the present application;

[0037] Fig. 9 A radiation imaging diagram of the insertion of a needle into a root canal when the needle tube is made of austenitic nickel-titanium alloy, provided in Example 2 of the present application;

[0038] Fig.10 A radiation imaging diagram of the filling of the root canal sealant in the root canal when the simulated needle tube is made of austenitic nickel-titanium alloy provided in Example 2 of the present application;

[0039] Fig.11 This is a rendering of the simulation of the needle tube inserted into the root canal when the needle tube is made of ordinary stainless steel provided in Example 2 of the present application;

[0040] Fig.12 A radiation imaging diagram of the situation where the needle tube is inserted into the root canal when the needle tube is made of ordinary stainless steel provided in Example 2 of the present application;

[0041] Fig.13 A radiation imaging diagram of the filling of the root canal sealant in the root canal when the simulated needle tube is made of ordinary stainless steel provided in Example 2 of the present application;

[0042] Fig.14 This is a rendering of the simulation of the needle tube inserted into the root canal when the needle tube is made of a martensitic nickel-titanium alloy provided in Example 2 of the present application;

[0043] Fig.15 A radiation imaging diagram of the insertion of a needle into a root canal when the needle tube is made of a martensitic nickel-titanium alloy provided in Example 2 of the present application;

[0044] Fig.16 A radiation imaging diagram of the filling of the root canal sealant in the root canal when the simulated needle tube is made of a martensitic nickel-titanium alloy provided in Example 2 of the present application;

[0045] Fig.17 This is a rendering of the simulation of the insertion of the needle tube into the root canal after a guide reinforcement tube is provided outside the needle tube made of martensitic nickel-titanium alloy, provided in Example 2 of the present application;

[0046] Fig.18 A radiation imaging diagram simulating the insertion of a needle tube into a root canal after a guide reinforcement tube is provided outside a needle tube made of a martensitic nickel-titanium alloy, provided in Example 2 of the present application;

[0047] Fig.19 A radiation imaging diagram of the filling of the root canal sealant in the root canal after a guide reinforcement tube is provided outside the needle tube made of a martensitic nickel-titanium alloy, provided in Example 2 of the present application;

[0048] Fig. 20 A radiation imaging diagram of the filling of the root canal sealant in the root canal when a high positive pressure is applied to the needle tube after a guide reinforcement tube is provided outside the needle tube made of martensite nickel-titanium alloy, provided in Example 2 of the present application;

[0049] Fig.21 A radiation imaging diagram of the filling of the root canal sealant in the root canal when the positive pressure applied to the needle tube is low after a guide reinforcement tube is arranged outside the needle tube made of martensite nickel-titanium alloy provided in Example 2 of the present application;

[0050] Fig. 22 A schematic diagram of the explosion structure of a pressure generator provided in Example 2 of the present application;

[0051] Fig.23 A schematic diagram of the three-dimensional structure of a root canal filling device provided in Example 2 of the present application;

[0052] Fig.24 for Fig.23 A schematic diagram of the front view of the root canal filling device shown;

[0053] Fig.25 for Fig.24 A schematic diagram of the cross-sectional structure at position B in the middle;

[0054] Fig.26 for Fig.23 A schematic diagram of the structure of the root canal filling device when the upper cover is opened;

[0055] Fig. 27 for Fig.23 Schematic diagram of the internal structure of the root canal filling device when the syringe is removed.

[0056] Among them, 1-root canal filling needle, 11-needle tube, 111-distal end, 112-proximal end, 113-flow channel, 114-notch, 12-handle body, 121-bend part, 122-inner cavity, 123-connection port, 13-guide reinforcement tube, 14-positioning block, 2-pressure generator, 20-shell, 201-pressure relief port, 21-positive pressure pump, 211-first solenoid valve, 22-negative pressure pump, 221-second solenoid valve, 23-hose, 231-positive pressure air circuit, 232-negative pressure air circuit, 24-handle, 2 41-pressure detection device, 25-hose interface, 251-positive pressure tube interface, 252-negative pressure tube interface, 26-housing, 261-upper cover, 262-lower cover, 263-through port, 264-slot structure, 265-charging interface, 27-tube, 271-tube mouth, 28-piston, 29-driver, 291-drive shaft, 292-slider, 2921-slot, 293-screw, 294-guide sleeve, 30-electricity storage component, 3-root canal, 31-root canal end, 4-root canal sealer, 41-bubble. DETAILED DESCRIPTION

[0057] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0058] Embodiment 1

[0059] This embodiment provides a root canal filling needle 1, which includes a needle tube 11 and a handle 12. The needle tube 11 has a distal end 111 for inserting into the root canal 3 and a proximal end 112 connected to the handle 12. The needle tube 11 is provided with a flow channel 113 that passes through the distal end 111 and the proximal end 112. There is a certain angle between the distal end 111 of the needle tube 11 and the axis of the handle 12. For example, Figures 1 to 4 A root canal filling needle 1 is schematically shown in FIG. 1 , wherein the end of the handle 12 is formed with a curved portion 121, and the proximal end 112 of the needle tube 11 is connected to the curved portion 121. Figure 5 Another root canal filling needle 1 is schematically shown in the figure, in which the proximal end 112 of the needle tube 11 is bent at a certain angle.

[0060] The needle tube 11 is preferably made of plastic metal. The plastic metal material can be a martensitic nickel-titanium alloy material, an R-phase nickel-titanium alloy material, a soft low-elastic stainless steel material, or a soft low-elastic aluminum alloy material. It is preferably drawn from a nickel-titanium alloy tube, and is further preferably a martensitic nickel-titanium alloy material or an R-phase nickel-titanium alloy material, which can be obtained by heat treatment of an austenitic nickel-titanium alloy, and the treatment temperature range is 100 to 1000°C. The end face of the distal end 111 is arranged perpendicular to the axis of the needle tube 11, and the flow channel opening of the flow channel 113 is arranged on the end face of the distal end 111, that is, the distal end 111 of the needle tube 11 is a flat head, such as Figure 2a As shown, when the distal end 111 of the needle tube 11 is inserted to the ideal filling position, the root canal sealer 4 can also flow into the ideal filling position. Preferably, the distal end 111 of the needle tube 11 is provided with a notch 114 near the end surface, the notch 114 penetrates the end surface, and the notch 114 is connected to the flow channel 113, as shown in FIG. Figure 2b As shown, the problem of the flow channel of the needle tube 11 being blocked when the distal end 111 of the needle tube 11 is inserted into the root canal end 31 can be avoided. The length of the notch 114 in the axial direction of the needle tube 11 is preferably no more than 1 mm, and more preferably no more than 0.3 mm. The needle tube 11 is made of plastic material, and when filling the root canal, the doctor can bend the distal end 111 of the needle tube 11 according to the condition of the target root canal 3, and after bending, the distal end 111 of the needle tube 11 will remain in the desired bending state, such as Figure 6 As shown, the needle tube 11 can be more easily inserted into the target root canal 3. The bending angle of the distal end 111 of the needle tube 11 is 0-180°, preferably 0-90°. Of course, the needle tube 11 can also be made of soft non-metallic material, such as plastic material or silicone material, plastic material such as polypropylene (PP), polysulfone (PSU) and polyphenylsulfone (PPSU).

[0061] A guide reinforcement tube 13 is sleeved on the needle tube 11 near the handle body 12. Figure 1 , Figure 3 or Figure 4As shown, the guide reinforcement tube 13 can be made of a relatively hard material such as stainless steel. The guide reinforcement tube 13 is fixedly connected to the handle body 12 or the needle tube 11, for example, one end of the guide reinforcement tube 13 can be fixedly connected to the handle body 12 by gluing or the like, or the guide reinforcement tube 13 can be fixedly connected to the needle tube 11 by welding or the like, or the guide reinforcement tube 13 and the needle tube 11 can be interference-fitted between the guide reinforcement tube 13 and the needle tube 11, and the guide reinforcement tube 13 can be pressed onto the needle tube 11 to achieve a fixed connection. The length of the needle tube 11 exposed from the guide reinforcement tube 13 is preferably 5 mm to 2 cm, and more preferably 9 mm. By sleeve-mounting a guide reinforcement tube 13 with a relatively high hardness on the needle tube 11, the strength of the needle tube 11 near the handle body 12 can be enhanced. When the needle tube 11 is inserted into the root canal 3, the guide reinforcement tube 13 on the needle tube 11 must at least extend into the pulp cavity of the tooth, and more preferably extend into 1 / 4 to 1 / 2 of the length of the root canal 3. The guide reinforcement tube 13 on the needle tube 11 enables the physician to better apply axial force to the needle tube 11, ensuring that the needle tube 11 can smoothly enter the end of the curved root canal 3.

[0062] In other embodiments, the needle tube may also be a tapered structure, and the needle tube becomes thicker from its distal end to its proximal end. The taper of the needle tube is preferably 0-10%, and more preferably 0-5%. By increasing the taper of the needle tube, the rigidity of the proximal end of the needle tube can also be increased, thereby achieving the effect of replacing the guide reinforcement tube.

[0063] In a further embodiment, a positioning block 14 may be provided on the needle tube 11, for example, a rubber ring, a metal block, a metal sheet, a plastic block or a plastic sheet, etc., which is sleeved on the needle tube 11. Figure 7 When performing root canal filling, the doctor can adjust the position of the positioning block 14 according to the condition of the target root canal 3, so as to assist the doctor in observing the insertion depth of the needle tube 11 when inserting the needle tube 11. Of course, a scale can also be set on the needle tube 11 to assist the doctor in observing the insertion depth of the needle tube 11.

[0064] In a further embodiment, since the inner diameter of the thinnest part of the root apex is generally not less than 0.25 mm, the outer diameter of the needle tube 11 described in the present application is preferably 0.1 mm to 0.35 mm, and further preferably 0.15 mm to 0.23 mm, to ensure that the distal end 111 of the needle tube 11 can smoothly enter the end of the curved root canal 3.

[0065] Embodiment 2

[0066] This embodiment provides a root canal filling device, which includes a pressure generator 2 and the root canal filling needle 1 described in the first embodiment. The pressure generator 2 is connected to the flow channel opening at the proximal end 112 of the needle tube 11, and the pressure generator 2 can provide positive pressure or negative pressure in the flow channel 113 of the needle tube 11. Figure 4 As schematically shown in FIG. 1 , the handle 12 of the root canal filling needle 1 is designed to have an inner cavity 122, and the proximal end 112 of the needle tube 11 of the root canal filling needle 1 is inserted into the inner cavity 122, so that the flow channel opening of the needle tube 11 at the proximal end 112 is connected to the inner cavity 122. The handle 12 is provided with a connection port 123 connected to the inner cavity 122, and the pressure generator 2 is connected to the connection port 123, and further connected to the flow channel 113 of the needle tube 11.

[0067] In a further embodiment, a pressure detection device 241 and a controller are preferably provided. The pressure detection device 241 is configured to detect the pressure value in the air path between the pressure generator 2 and the needle tube 11. The pressure detection device 241 may be, for example, a pressure sensor. The controller is respectively connected to the pressure generator 2 and the pressure detection device 241 for communication, and the controller has a built-in control logic, which can control the pressure generator 2 to work according to the pressure value detected by the pressure detection device 241. The details are as follows:

[0068] When filling the root canal 3, the root canal sealer 4 is first injected into the upper section of the target root canal 3, and then the distal end 111 of the needle tube 11 of the root canal filling needle 1 is inserted into the target root canal 3 through the root canal sealer 4. Before the needle tube 11 reaches the working length, i.e., the filling stop point, the controller controls the pressure generator 2 to provide positive pressure in the needle tube 11 to ensure that the root canal sealer 4 does not enter the needle tube 11 too much during the process of the needle tube 11 passing through the root canal sealer 4. Preferably, the positive pressure value applied to the needle tube 11 is 0.005MPa to 0.08MPa. In the process of reaching the working length, the pressure detection device 241 always detects the pressure value in the flow channel 113 of the needle tube 11 and sends it to the controller. The controller compares the received pressure value with the preset set pressure value, and controls the pressure generator 2 to work according to the comparison result, realizing negative feedback regulation, so that the pressure value in the flow channel 113 of the needle tube 11 is always maintained at the set value.

[0069] When the needle tube 11 reaches the working length, the controller controls the pressure generator 2 to provide negative pressure in the needle tube 11, evacuates the air in the target root canal 3, and generates negative pressure in the target root canal 3, thereby attracting the root canal sealer 4 at the upper end of the target root canal 3 to flow slowly to the root apex until the entire target root canal 3 is filled, and then the needle tube 11 is withdrawn from the target root canal 3. Preferably, the negative pressure value applied to the needle tube 11 is -0.005MPa to -0.09MPa. Further preferably, the pressure generator 2 is controlled by a foot switch to provide negative pressure in the needle tube 11. The foot switch is communicatively connected to the controller. When the foot switch is closed, the controller obtains the closing signal of the foot switch and controls the pressure generator 2 to provide negative pressure in the flow channel 113 of the needle tube 11. When the foot switch is disconnected, the controller obtains the disconnection signal of the foot switch and controls the pressure generator 2 to stop working. Of course, the control method of the pressure generator 2 is not limited to the above method. For example, the foot switch can also be a double-key structure, one key is used to control the pressure generator 2 to provide positive pressure, and the other key is used to control the pressure generator 2 to provide negative pressure. Of course, the foot switch can also be a multi-key structure, and the other keys can be used to control the size of the positive and negative pressures provided by the pressure generator 2; for another example, the pressure generator 2 can also be controlled by a touch switch, a press switch, or a voice-activated switch, or a touch switch, a press switch, a voice-activated switch, or a foot switch. In the process of vacuuming, the pressure detection device 241 also always detects the pressure value in the airway and sends it to the controller. The controller compares the received pressure value with the preset set pressure value, and controls the pressure generator 2 to work according to the comparison result, realizing negative feedback regulation, so that the pressure value in the flow channel 113 of the needle tube 11 is always maintained at the set value.

[0070] Next, the root canal filling device of this embodiment is simulated and compared with the prior art through experiments, as follows:

[0071] like Figure 8 and Fig. 9 As shown in the figure, the needle tube 11 is simulated to extend into the root canal 3 when the needle tube 11 is made of austenitic nickel-titanium alloy. Since the needle tube 11 is relatively hard, the needle tube 11 made of this material can only enter part of the root canal 3, and the distal end 111 of the needle tube 11 cannot reach the root canal end 31. Therefore, when vacuuming the root canal 3, the air at the root canal end 31 cannot be extracted, which results in the root canal sealer 4 not being able to fill the root canal end 31 well. Fig.10 shown.

[0072] like Fig.11 and Fig.12As shown in the figure, the needle tube 11 is simulated to extend into the root canal 3 when the needle tube 11 is made of ordinary stainless steel. Since the needle tube 11 is relatively hard, the needle tube 11 made of this material can only enter part of the root canal 3, and the distal end 111 of the needle tube 11 cannot reach the root canal end 31. Therefore, when vacuuming the root canal 3, the air at the root canal end 31 cannot be extracted, which results in the root canal sealer 4 not being able to fill the root canal end 31 well. Fig.13 shown.

[0073] like Fig.14 and Fig.15 As shown in the figure, the simulation shows the insertion of the needle tube 11 into the root canal 3 when the needle tube 11 is made of a martensitic nickel-titanium alloy. Since the needle tube 11 is thin and the material is soft, it is difficult to apply force along the long axis of the needle tube 11 during the insertion of the needle tube 11. Although the needle tube 11 can be inserted deeper than the needles made of the first two materials, it is also not easy to enter the end of the curved root canal 3. Therefore, when the root canal 3 is vacuumed, the air at the root canal end 31 cannot be extracted, which results in the root canal sealer 4 not being able to fill the root canal end 31 well. Fig.16 shown.

[0074] like Fig.17 and Fig.18 As shown in the figure, a simulation is shown of the insertion of the needle tube 11 into the root canal 3 after the guide reinforcement tube 13 is provided outside the needle tube 11 made of martensitic nickel-titanium alloy. Since the guide reinforcement tube 13 is provided on the needle tube 11, the physician can better apply axial force to the needle tube 11 when inserting the needle tube 11, so that the needle tube 11 can smoothly enter the end of the curved root canal 3. Therefore, when vacuuming the root canal 3, the air bubble 41 at the end 31 of the root canal can be vacuumed, so that the root canal sealer 4 at the upper end of the root canal 3 can flow to the end 31 of the root canal well, thereby filling the end 31 of the root canal. Fig.19 shown.

[0075] Through Figures 8 to 19 Comparative analysis shows that no matter the needle tube 11 is made of stainless steel with relatively high hardness, austenitic nickel-titanium alloy with relatively high elasticity, or only of martensite nickel-titanium alloy with good flexibility, its distal end 111 cannot be well inserted into the root canal end 31. However, in the present application, by providing a guide reinforcement tube 13 on the needle tube 11 made of martensite nickel-titanium alloy, the distal end 111 of the needle tube 11 can smoothly reach the root canal end 31, and can effectively discharge the bubbles 41 near the root canal end 31. The filling effect of the root canal sealer 4 in the root canal 3, especially near the root canal end 31, is significantly better than the previous three.

[0076] like Fig. 20As shown in the figure, after the guide reinforcement tube 13 is arranged outside the needle tube 11 made of martensitic nickel-titanium alloy, the filling condition of the root canal sealer 4 in the root canal 3 is simulated when a high positive pressure, such as greater than 0.08 MPa, is applied to the needle tube 11. Since a high positive pressure is applied to the needle tube 11, the gas in the needle tube 11 will enter the root canal sealer 4 to form bubbles 41 during the process of the needle tube 11 passing through the root canal sealer 4, thereby increasing the number of bubbles 41 in the root canal sealer 4.

[0077] like Fig.21 As shown in the figure, after the guide reinforcement tube 13 is arranged outside the needle tube 11 made of martensitic nickel-titanium alloy, the filling condition of the root canal sealer 4 in the root canal 3 is simulated when the positive pressure applied to the needle tube 11 is low, such as less than 0.005Mpa. Since a low positive pressure is applied to the needle tube 11, the root canal sealer 4 will block the needle tube 11 during the process of the needle tube 11 passing through the root canal sealer 4, thereby causing the root canal filling device to be unable to properly evacuate the bubbles 41 in the root canal 3.

[0078] It can be seen from the above that a positive pressure value applied to the needle tube 11 that is too high or too low will affect the vacuuming effect of the bubbles 41 in the root canal 3, thereby affecting the filling effect of the root canal sealer 4 in the root canal 3. Therefore, it is necessary to set the positive pressure value applied to the needle tube 11 within a reasonable range.

[0079] In a further embodiment, after the root canal sealer 4 fills the entire target root canal 3 and the needle tube 11 is withdrawn, a fine gutta-percha tip can also be inserted into the target root canal 3. Compared with the traditional large gutta-percha tip, the present application adopts a fine gutta-percha tip, which can not disturb the root canal sealer 4 when the gutta-percha tip is buried, and the root canal sealer 4 will not be pushed out from the root apex to cause overfilling. By burying the fine gutta-percha tip in the root canal sealer 4, during the later retreatment, the doctor can drill out the fine gutta-percha tip buried in the root canal sealer 4 with tools such as a drill bit, so as to provide a path for retreatment. In the process of drilling out the fine gutta-percha tip, the surrounding root canal sealers 4 can be brought out together. At the same time, the retreatment path formed can also facilitate the insertion of ultrasonic instruments, and then all the root canal sealers 4 in the root canal can be shattered without damaging the teeth.

[0080] In a further embodiment, the pressure generator 2 may be a pressure pump type, including a pressure pump, the pressure pump is connected to the flow channel 113 of the needle tube 11, and the pressure pump can provide positive pressure and / or negative pressure in the flow channel 113 of the needle tube 11. Fig. 22A pressure generator 2 schematically shown in the figure comprises a housing 20, a positive pressure pump 21, a negative pressure pump 22, a hose 23, a handle 24, and a first solenoid valve 211 and a second solenoid valve 221. The positive pressure pump 21, the negative pressure pump 22, the first solenoid valve 211 and the second solenoid valve 221 are respectively arranged in the housing 20. A hose interface 25 is arranged on the housing 20, and a positive pressure pipe interface 251 connected to the working port of the positive pressure pump 21 and a negative pressure pipe interface 252 connected to the working port of the negative pressure pump 22 are arranged in the hose interface 25. There are two air paths in the hose 23, one as a positive pressure air path 231 and the other as a negative pressure air path 232, and the air path in the hose 23 runs through both ends of the hose 23. After one end of the hose 23 is connected to the hose interface 25 on the housing 20, the two air paths in the hose 23 are respectively connected to the positive pressure pipe interface 251 and the negative pressure pipe interface 252. The handle 24 is provided with a double air path, one end of the two air paths respectively passes through one end of the handle 24, and the other ends of the two air paths intersect to form a single air path, and the single air path passes through the other end of the handle 24. The double air path end of the handle 24 is connected to the other end of the hose 23, and the two air paths in the handle 24 are respectively connected to the two air paths in the hose 23. The handle body 12 of the root canal filling needle 1 is provided at the single air path end of the handle 24 through a connecting port 123, and the inner cavity 122 of the handle body 12 is connected to the single air path of the handle 24, that is, the flow channel port at the proximal end 112 of the needle tube 11 is connected to the working port of the positive pressure pump 21 or the negative pressure pump 22. In specific implementation, positive pressure or negative pressure can be provided to the needle tube 11 of the root canal filling needle 1 by controlling the operation of the positive pressure pump 21 or the negative pressure pump 22. The shell 20 is also provided with a pressure relief port 201, and the pressure relief port 201 is respectively connected to a valve port of the first solenoid valve 211 and a valve port of the second solenoid valve 221, and the other valve port of the first solenoid valve 211 is connected to the positive pressure pipe interface 251, and the other valve port of the second solenoid valve 221 is connected to the negative pressure pipe interface 252. By controlling the operation of the first solenoid valve 211 or the second solenoid valve 221, the positive pressure gas circuit 231 or the negative pressure gas circuit 232 can be controlled to release pressure quickly. In a further embodiment, the handle 24 can be made of metal. After use, the handle 24 is removed from the hose 23, and the root canal filling needle 1 is removed and then cleaned and disinfected for reuse. The handle 24 can also be made of plastic, which is low in cost, does not need to be disinfected after use, is disposable, and is convenient and quick. In this embodiment, the pressure detection device 241 can be provided on the handle 24, such as Fig. 22 As shown in the figure, the pressure detection device 241 is arranged at the single airway, so that the air pressure value in the airway can be detected. Of course, the pressure detection device 241 can also be arranged at other positions of the airway.

[0081] The pressure generator 2 may also be a piston type, for example, and includes a tube 27, a piston 28, and a driver 29. The piston 28 is disposed in the tube 27, and a chamber is formed between the piston 28 and the tube 27. The tube 27 is provided with a nozzle 271 connected to the chamber, and the nozzle 271 is connected to the flow channel opening at the proximal end 112 of the needle tube 11, for example, connected to the connection port 123 on the handle body 12. The driver 29 is connected to the controller, and the controller drives the piston 28 to move in the tube 27 by controlling the driver 29, that is, regulating the amplitude of the movement of the piston 28, thereby controlling the size change of the chamber, and realizing the regulation of the pressure in the flow channel 113 of the needle tube 11.

[0082] for example Figure 23 to Figure 27 A piston-type pressure generator 2 schematically shown in the figure comprises a housing 26, a syringe and a driver 29 arranged in the housing 26. The housing 26 is composed of an upper cover 261 and a lower cover 262, wherein the upper cover 261 is arranged on one side of the lower cover 262, and a receiving chamber is formed between the upper cover 261 and the lower cover 262. A through port 263 communicating with the receiving chamber is arranged at one end of the housing 26. A slot structure 264 is arranged in the receiving chamber, and the syringe is detachably arranged between the through port 263 and the slot structure 264. The syringe barrel is the tube barrel 27, and the nipple structure at the closed end of the syringe barrel is the tube mouth 271; the piston core rod of the syringe is the piston 28. The closed end of the syringe is away from the slot structure 264, and the flange structure at the open end of the syringe is located in the slot structure 264. The slot structure 264 realizes axial limitation of the syringe, thereby ensuring that the syringe will not move axially relative to the shell 26 when it is set in the accommodating cavity. Fig.26 The housing 26 schematically shown in the figure has an upper cover 261 and a lower cover 262 symmetrically arranged, that is, a part of the slot structure 264 is arranged on the inner wall of the upper cover 261, and the other part is arranged on the inner wall of the lower cover 262. In a specific implementation, the upper cover 261 and the lower cover 262 may not be symmetrically arranged, that is, the slot structure 264 is only arranged on the inner wall of the upper cover 261 or the inner wall of the lower cover 262. The slot structure 264 is composed of two convex ridge structures arranged at intervals along the axial direction of the housing 26. When installing the syringe, it is only necessary to place the flange structure at the opening end of the syringe between the two convex ridge structures on the inner wall of the upper cover 261 or the inner wall of the lower cover 262, and then cover the upper cover 261 and the lower cover 262. It is very convenient to disassemble and assemble the syringe.

[0083] The driver 29 is preferably a motor, which is arranged on the side of the slot structure 264 away from the through port 263. The driving shaft 291 of the motor faces the syringe. A slider 292 is arranged between the driver 29 and the syringe, and the slider 292 can only move in the accommodating cavity along the axial direction of the housing 26. Figure 25 to Figure 27 As schematically shown in FIG. 2 , a guide sleeve 294 is provided in the accommodation cavity, and the slider 292 is provided in the lumen of the guide sleeve 294. By designing the guide sleeve 294 and the slider 292, the slider 292 can only move in the guide sleeve 294 along the axial direction of the housing 26 and cannot rotate. For example, the radial cross-sectional shape of the slider 292 can be designed to be non-circular such as an ellipse or a triangle, and the lumen shape of the guide sleeve 294 can be matched therewith. Of course, the above is only a preferred solution. In specific implementation, the guide sleeve 294 may not be provided, and the slider 292 may directly cooperate with the housing 26.

[0084] The piston core rod of the syringe is connected to the slider 292, and the drive shaft 291 of the driver 29 is threadedly connected to the slider 292 via a screw 293. When the motor is working, the rotation of the drive shaft 291 will drive the screw 293 to rotate, and then drive the slider 292 to move along the axial direction of the housing 26 with the piston core shaft, thereby controlling the size change of the inner chamber of the syringe and adjusting the pressure in the flow channel 113 of the needle tube 11. In order to facilitate the replacement of the syringe, the slider 292 and the piston core rod are also detachably connected. For example, a slot 2921 matching the flange structure of the piston core rod end can be provided on the slider 292, such as Fig. 27 As shown, when installing the syringe, the flange structure at the end of the piston core rod is placed in the slot 2921 on the slider 292, as shown in FIG. Fig.26 shown.

[0085] The controller may be, for example, a control chip, which is disposed in the housing 26 through a circuit board. The control chip has built-in control logic, so that after the physician triggers the corresponding control switch, the controller can control the driver 29 to work. In this structure of the pressure generator 2, it is preferably designed that when the handle body 12 is picked up, the controller controls the pressure generator 2 to provide positive pressure to the needle tube 11. Specifically, a pick-up detection device may be provided to detect whether the handle body 12 is picked up. The pick-up detection device may be, for example, a speed sensor or a gyroscope, which is disposed in the housing 26 and is communicatively connected to the controller. When the pick-up detection device detects the pick-up action of the pressure generator 2, that is, the handle body 12, it will send a detection signal to the controller. After receiving the detection signal, the controller controls the pressure generator 2 to provide positive pressure to the flow channel 113 of the needle tube 11.

[0086] It is further preferred that a battery or other power storage component 30 is disposed in the accommodating cavity to store electricity for supplying power to the driver 29. Figure 25 to Figure 27 The housing 26 is provided with a charging interface 265, which is electrically connected to the power storage component 30, and the power storage component 30 can be charged through the charging interface 265. By providing the power storage component 30, it can be applied to a working environment without an external power supply, and can meet different usage requirements.

[0087] Compared with the prior art, the root canal filling needle and root canal filling device of the present application have at least one or more of the following beneficial effects:

[0088] (1) The root canal filling needle of the present application increases the hardness by sleeve-mounting a guide reinforcement tube on the needle tube near the handle body, so that the needle tube can be made of a plastic material with good flexibility such as a martensitic nickel-titanium alloy, an R-phase nickel-titanium alloy, a soft low-elastic stainless steel material, or a soft low-elastic aluminum alloy material, thereby ensuring that the needle tube can be smoothly inserted into the end of the curved root canal;

[0089] (2) The root canal filling needle of the present application has a needle tube made of a molded metal material. When performing root canal filling, the physician can bend the distal end of the needle tube according to the condition of the target root canal. After bending, the distal end of the needle tube will remain in the desired bending state, making it easier for the needle tube to be inserted into the target root canal;

[0090] (3) The root canal filling needle of the present application has an end face of the distal end of the needle tube arranged perpendicular to the needle tube axis, and a flow channel opening of the flow channel is arranged on the end face of the distal end, so that when the distal end of the needle tube is inserted to the ideal filling position, it can ensure that the root canal sealer can also flow into the ideal filling position;

[0091] (4) The root canal filling needle of the present application may be provided with a positioning block on the needle tube. When performing root canal filling, the physician may adjust the position of the positioning block according to the condition of the target root canal, thereby assisting the physician in observing the insertion depth of the needle tube when inserting the needle tube;

[0092] (5) The root canal filling device of the present application can use the above-mentioned root canal filling needle to evacuate the target root canal, so that the root canal sealer can fill the entire target root canal, reduce the probability of underfilling or overfilling of the root canal sealer, improve the root canal filling effect and patient comfort, and can also be provided with a pressure detection device, through negative feedback regulation, so that the pressure in the needle tube is always maintained at a set value, thereby effectively reducing the proportion of bubbles generated during the root canal filling process and avoiding needle tube blockage, thereby improving the filling effect.

[0093] In this document, the terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of elements other than those listed and may also include additional elements not expressly listed.

[0094] In this document, the directional words such as front, back, top, and bottom are defined by the positions of the components in the drawings and the positions of the components relative to each other, and are only for the sake of clarity and convenience in expressing the technical solution. It should be understood that the use of the directional words should not limit the scope of protection claimed in this application.

[0095] In the absence of conflict, the above embodiments and features in the embodiments may be combined with each other.

[0096] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A root canal filling needle, characterized in that: The invention comprises a needle tube (11) and a handle body (12); the needle tube (11) has a distal end (111) for inserting into a root canal (3) and a proximal end (112) connected to the handle body (12); a flow channel (113) penetrating the distal end (111) and the proximal end (112) is arranged in the needle tube (11); and a guide reinforcement tube (13) is arranged on the needle tube (11) near the handle body (12).

2. The root canal filling needle according to claim 1, characterized in that: The needle tube (11) is made of plastic metal, and the distal end (111) of the needle tube (11) can be bent and maintained in a bent state.

3. The root canal filling needle according to claim 2, characterized in that: The plastic metal material is a martensite nickel-titanium alloy material, an R-phase nickel-titanium alloy material, a soft low-elastic stainless steel material or a soft low-elastic aluminum alloy material.

4. The root canal filling needle according to claim 1, characterized in that: The needle tube (11) is made of soft non-metal material.

5. The root canal filling needle according to claim 1, characterized in that: The end surface of the distal end (111) is arranged perpendicular to the axis of the needle tube (11), and the flow channel opening of the flow channel (113) is arranged on the end surface of the distal end (111).

6. The root canal filling needle according to claim 5, characterized in that: The distal end (111) of the needle tube (11) is provided with a notch near the end surface, the notch penetrates the end surface, and the notch is communicated with the flow channel (113).

7. The root canal filling needle according to claim 6, characterized in that: The length of the notch in the axial direction of the needle tube (11) does not exceed 1 mm.

8. The root canal filling needle according to claim 1, characterized in that: The needle tube (11) is also provided with a positioning block (14) or a scale.

9. The root canal filling needle according to claim 1, characterized in that: The outer diameter of the needle tube (11) is 0.1 mm to 0.35 mm.

10. A root canal filling device, characterized in that: It comprises a pressure generator (2) and a root canal filling needle (1) as described in any one of claims 1 to 9, wherein the pressure generator (2) is connected to a flow channel opening at a proximal end (112) of the needle tube (11), and the pressure generator (2) can provide positive pressure or negative pressure in the flow channel (113) of the needle tube (11).

11. The root canal filling device according to claim 10, characterized in that It also includes a pressure detection device (241) and a controller, wherein the pressure detection device (241) is configured to detect the pressure value in the air path between the pressure generator (2) and the needle tube (11), and the controller is communicatively connected to the pressure generator (2) and the pressure detection device (241) respectively, and the controller is configured to control the operation of the pressure generator (2) according to the pressure value detected by the pressure detection device (241).

12. The root canal filling device according to claim 11, characterized in that It includes a pick-up detection device, which is communicatively connected to the controller. The pick-up detection device is configured to detect the pick-up action of the handle body (12) and send a detection signal to the controller. The controller is configured to control the pressure generator (2) to provide positive pressure in the flow channel (113) according to the detection signal.

13. The root canal filling device according to claim 11, characterized in that It also includes a foot switch, which is communicatively connected to the controller. The controller is configured to obtain a control signal generated by the foot switch after it is closed and opened, and to control the pressure generator (2) to provide positive pressure and / or negative pressure in the flow channel (113) according to the control signal.

14. The root canal filling device according to claim 11, characterized in that The pressure generator (2) comprises a pressure pump, the pressure pump is connected to the flow channel (113) of the needle tube (11), and the pressure pump can provide positive pressure and / or negative pressure in the flow channel (113) of the needle tube (11); or The pressure generator (2) comprises a tube (27), a piston (28) and a driver (29); the piston (28) is arranged in the tube (27); a chamber is formed between the piston (28) and the tube (27); a tube mouth (271) communicating with the chamber is arranged on the tube (27); the tube mouth (271) is communicated with a flow channel opening at the proximal end (112) of the needle tube (11); the driver (29) is connected to the controller; the controller drives the piston (28) to move in the tube (27) by controlling the driver (29).

15. The root canal filling device according to claim 10, characterized in that The positive pressure applied to the needle tube (11) is 0.005 MPa to 0.08 MPa; The negative pressure value applied to the needle tube (11) is -0.005MPa to -0.09MPa.

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