A machine-use root canal file and its manufacturing method

Abstract

The present invention relates to a machine-use root canal file and a manufacturing method thereof, including a head connection seat for connecting with a root canal motor. The head connection seat is connected with an outer sheath tube and a file needle. The outer sheath tube is rotationally connected with an intermediate section, and a through hole is arranged in the intermediate section. A telescopic file needle is arranged in the intermediate section, and the file needle passes through the intermediate section and is connected to an adjusting component of the outer sheath tube. In the present invention, by providing a root canal file with adjustable length, on the one hand, the length of the pulp root canal can be detected, and on the other hand, telescopic control can be carried out in sequence to ensure that the root canal operation surface is fully in place.

Description

Technical Field

[0001] The present invention relates to the field of engine-driven root canal files, and particularly to an engine-driven root canal file. Background Art

[0002] Root canal treatment of infected tooth tissue is the most conventional means in the prior art; dental surgeries for removing infected tooth tissue from the root canal usually require specialized tools. Such tools include root canal files. Root canal files are usually used to remove infected tooth tissue from the root canal, and root canal files are also used for cleaning the tissue near the root canal. In the prior art, the functions of root canal files are relatively single, and the operating environment of the root canal cannot be adjusted and predicted, and it is very easy to break. Summary of the Invention

[0003] The present invention provides an engine-driven root canal file, which is realized by adopting the following technical solutions:

[0004] An engine-driven root canal file includes a head connection seat for connecting with a root canal motor, the head connection seat is connected with an outer sheath tube and a file needle, and is characterized in that:

[0005] The outer sheath tube is rotatably connected with an intermediate section, a through hole is arranged in the intermediate section, a telescopic file needle is arranged in the intermediate section, and the file needle passes through the intermediate section and is connected to an adjusting component of the outer sheath tube;

[0006] The adjusting component is used for adjusting the length of the file needle, an impedance unit is connected to the intermediate section, the file needle includes a bottom electrical contact, and the file needle and the impedance unit form a potential connection to detect the voltage of the file needle after being powered on;

[0007] The adjusting component is arranged in the outer sheath tube, and the adjusting component includes a file needle spur gear and a threaded knob. Half of the threaded knob is arranged inside the outer sheath tube and half is arranged outside, which is convenient for manual adjustment;

[0008] The impedance unit includes an impedance circuit and a display unit. The impedance circuit is electrically connected to the display unit. The impedance circuit can display different voltage levels through the resistance change of the file needle. The display unit is provided with three-color scales of red, green and blue and a displayed voltage value V. When the root canal file is not rotating, it is displayed in blue, and the voltage value at this time is a preset initial value V0. When the root canal file is rotated, as the temperature of the file needle changes, its resistance changes. When the display unit displays red, the operating voltage is too high, and it is reminded to pause the operation; when the display unit displays green, the voltage meets the threshold, and the work continues to be maintained.

[0009] A cross-shaped card joint is arranged at the bottom of the head connection seat, and the cross-shaped card joint is connected with the root canal motor in a matching manner.

[0010] The file needle includes a blade and a straight rod connected to the spur gear of the file needle, and the blade is made of nitinol alloy.

[0011] The length of the file needle is 17-19 mm, and the blade includes a cutting edge with a triangular cross-section.

[0012] The cutting length of the blade is 9 mm, the applied rotational speed is 150-300 rpm, the tip diameter is 0.21 mm, and the taper is 1.2%.

[0013] The processing method of the file needle includes:

[0014] Step 1: Bar preparation:

[0015] Take sponge titanium raw materials, melt them at 1000-1200 °C according to the equal proportion of Ni and Ti alloy ratio, perform primary vacuum consumable melting using a plasma beam melting device, perform secondary melting at 400-500 °C, and form a standard alloy bar through annealing and cooling processes;

[0016] Step 2: Secondary forging: Quench the standard alloy bar at a temperature of 680-800 °C, cool it at a temperature of 200-300 °C, and process the standard alloy bar into nitinol alloy wire through an extrusion machine;

[0017] Step 3: Machining and forming: According to the standard size, twist three strands of nitinol alloy wire into one strand through a wire twisting device, stamp them into one body at a temperature of 100-200 °C to form a file needle prototype, and machine a blade on the file needle prototype;

[0018] Step 4: Keep the nitinol alloy root file needle at 250-450 °C for 80-120 min, then air-cool it. The particle size of the nitinol alloy in the obtained nitinol alloy root file needle is 100 nm-150 nm.

[0019] After adopting the above technical solutions, the beneficial effects of the present invention are:

[0020] 1. In the present invention, by setting a root canal file with adjustable length, on the one hand, the length of the pulp root canal can be detected, and on the other hand, telescopic control can be performed in sequence to ensure that the root canal operation surface is fully in place.

[0021] 2. In the present invention, by utilizing the characteristics of nitinol alloy, according to the temperature change during its cutting operation, measuring its resistance to judge whether the file needle of the root canal file reaches the yield or is close to being damaged, thereby reducing the breakage of the file needle.

[0022] 3. In the present invention, by setting an initial threshold and a display unit, the working state of the root canal file is intuitively expressed. Description of the Drawings

[0023] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 It is a schematic structural diagram of a root canal file provided by an embodiment of the present application.

[0025] Figure 2 It is a schematic connection diagram of the middle section and the file needle of a root canal file provided by an embodiment of the present application.

[0026] Figure 3 It is a schematic diagram of the outer sheath tube of a root canal file provided by an embodiment of the present application.

[0027] Figure 4 It is a schematic electrical connection diagram of a root canal file provided by an embodiment of the present application

[0028] Explanation of reference numerals:

[0029] 1 - end connection seat, 2 - outer sheath tube, 3 - file needle, 4 - middle section, 5 - adjustment component, 6 - impedance unit, 7 - bottom electrical contact, 8 - file needle spur gear, 9 - threaded knob, 10 - impedance circuit, 11 - display unit. Specific embodiments

[0030] Through the following description of the embodiments, it will be more helpful for the public to understand the present invention. However, the specific embodiments given by the applicant should not be regarded as a limitation to the technical solutions of the present invention. Any change in the definition of components or technical features, or a formal rather than substantial transformation of the overall structure should be regarded as the protection scope defined by the technical solutions of the present invention.

[0031] In the present application, unless otherwise clearly specified or limited, terms such as "installation", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or indirectly connected through an intermediate medium, or the internal communication of two components, or only surface contact, or surface contact connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0032] The present invention is implemented by adopting the following technical solutions:

[0033] Such as Figure 1As shown, a rotary root canal file includes a head connection seat 1 for connecting to a root canal motor, and the head connection seat is connected to an outer sheath tube 2 and a file needle 3.

[0034] Preferably, the outer sheath tube is rotatably connected to an intermediate section 4. A through hole is provided in the intermediate section, and a telescopic file needle is provided in the intermediate section. The file needle passes through the intermediate section and is connected to an adjustment component 5 of the outer sheath tube;

[0035] Preferably, the adjustment component is used to adjust the length of the file needle. An impedance unit 6 is connected to the intermediate section. The file needle includes a bottom electrical contact 7, and the file needle and the impedance unit form a potential connection to detect the voltage of the file needle after power-on;

[0036] Preferably, the adjustment component 5 is arranged inside the outer sheath tube 2. The adjustment component includes a file needle spur gear 8 and a threaded knob 9. Half of the threaded knob is arranged inside the outer sheath tube and half is arranged outside, which is convenient for manual adjustment;

[0037] Preferably, the impedance unit includes an impedance circuit 10 and a display unit 11. The impedance circuit 10 is electrically connected to the display unit 11. The impedance circuit can display different voltage levels through the resistance change of the file needle. The display unit is provided with three-color scales of red, green, and blue and a displayed voltage value V. When the root canal file is not rotating, it is displayed in blue, and the voltage value is the preset initial value V0 at this time. When the root canal file is rotated, as the temperature of the file needle changes, its resistance changes. When the display unit shows red, the operating voltage is too high, and it is reminded to pause the operation; when the display unit shows green, the voltage meets the threshold, and the work continues to be maintained.

[0038] Preferably, a cross-shaped card joint is provided at the bottom of the head connection seat, and the cross-shaped card joint is connected to the root canal motor in a matching manner. The position of the bottom of the intermediate section where it is connected to the file needle is set as a conical surface, which ensures that the file needle is not interfered as much as possible during rotation. When the root canal motor is driving, the intermediate section serves as a brush part, and its inner wall forms a path with the file needle in the impedance circuit.

[0039] Preferably, the file needle includes a cutting edge and a straight rod that is connected to the file needle spur gear in a matching manner. The cutting edge is processed from nitinol alloy.

[0040] Preferably, the length of the file needle is 17 - 19 mm, and the cutting edge includes a cutting edge with a triangular cross-section.

[0041] Preferably, the cutting length of the cutting edge is 9 mm, the applied rotation speed is 150 - 300 rpm, the tip diameter is 0.21 mm, and the taper is 1.2%.

[0042] The processing method of the file needle includes:

[0043] Step 1: Rod preparation:

[0044] Take titanium sponge raw materials, melt them at 1000 - 1200 °C according to the equal - proportion ratio of Ni and Ti alloys, conduct primary vacuum consumable melting using a plasma beam melting device, conduct secondary melting at 400 - 500 °C, and form a standard alloy rod through annealing and cooling processes;

[0045] Step Two: Secondary forging: Quench the standard alloy rod at a temperature of 680 - 800 °C, cool it at a temperature of 200 - 300 °C, and process the standard alloy rod into nickel - titanium alloy wire through an extrusion machine;

[0046] Step Three: Processing and forming: According to the standard size, twist three strands of nickel - titanium alloy wire into one strand through a wire - twisting device, stamp them into an integral file needle prototype at a temperature of 100 - 200 °C, and machine a cutting edge on the file needle prototype;

[0047] Step Four: Keep the nickel - titanium alloy root file needle at 250 - 450 °C for 80 - 120 min, then air - cool it. The particle size of the nickel - titanium alloy in the obtained nickel - titanium alloy root file needle is 100 nm - 150 nm.

[0048] The processing method of the outer sheath tube includes:

[0049] Step One: Rod preparation:

[0050] Take titanium sponge raw materials, melt them at 1000 - 1200 °C according to the equal - proportion ratio of Ni and Ti alloys, conduct primary vacuum consumable melting using a plasma beam melting device, conduct secondary melting at 400 - 500 °C, and form a standard alloy rod through annealing and cooling processes;

[0051] Step Two: Secondary forging and processing: Quench the standard alloy rod at a temperature of 800 °C, cool it at a temperature of 300 °C, and process the standard alloy rod into an outer sheath tube through an extrusion machine;

[0052] The annealing process of the NiTi alloy rod includes heating the blank at a threshold temperature and heating for a time of more than 120 min to make the blank reach a state with a desired crystal structure of more than 95% austenite and more than 95% martensite. The crystal structure preferably includes a certain percentage of rhombohedral - phase crystal structure.

[0053] The operation mode of the present invention is to first connect the end connecting seat to the root canal motor, and pre - select to measure the depth of the root canal or perform internal root canal shaping according to different conditions of the patient.

[0054] When measuring the root canal depth, the thread knob can be used to illuminate with a searchlight, and the depth of the file needle can be manually adjusted. Whether the root canal bottom is reached is judged according to the operator's experience. At the same time, the display unit is used to display the resistance, and the resistance value between the periodontal tissue and the oral mucosa is maintained at about 6.5 KΩ.

[0055] When performing root canal shaping or treatment, the motor can be started according to the established length of the file needle. In cooperation with the high cutting and memory performance of the nickel-titanium alloy root file needle, the uneven positions can be polished and cut. The start and stop are controlled according to the color scale of the display unit, which is beneficial to prevent and ensure the file needle.

[0056] Those skilled in the art should understand that those skilled in the art can implement variations in combination with the prior art and the above embodiments, which will not be elaborated here. Such variations do not affect the essence of the present invention and will not be elaborated here.

[0057] The preferred embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above specific embodiments. The equipment and structures not described in detail should be understood to be implemented in a common way in the art; any person skilled in the art can make many possible changes and modifications to the technical solution of the present invention, or modify it into an equivalent embodiment with equivalent changes, without departing from the scope of the technical solution of the present invention, which does not affect the essence of the present invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the protection of the technical solution of the present invention.

Claims

1. A machine-use root canal file, comprising a head connection seat for connecting with a root canal motor, the head connection seat is connected with an outer sheath tube and a file needle. Characterized in that: The outer sheath tube is rotatably connected with an intermediate section, a through hole is arranged in the intermediate section, a telescopic file needle is arranged in the intermediate section, and the file needle passes through the intermediate section and is connected to an adjusting component of the outer sheath tube; The adjusting component is used for adjusting the length of the file needle, an impedance unit is connected to the intermediate section, the file needle includes a bottom electrical contact, and the file needle and the impedance unit form a potential connection to detect the voltage of the file needle after being energized; The adjusting component is arranged in the outer sheath tube, and the adjusting component includes a file needle spur gear and a threaded knob. Half of the threaded knob is arranged inside the outer sheath tube and half is arranged outside, which is convenient for manual adjustment; The impedance unit includes an impedance circuit and a display unit. The impedance circuit is electrically connected with the display unit. The impedance circuit can display different voltage grades through the resistance change of the file needle. The display unit is provided with three-color scales of red, green and blue and a displayed voltage value V. When the root canal file is not rotating, it is displayed in blue, and the voltage value at this time is a preset initial value V0. When the root canal file is rotated, with the temperature change of the file needle, its resistance changes. When the display unit is displayed in red, the operating voltage is too high, and it is reminded to pause the operation; when the display unit is displayed in green, the voltage meets the threshold, and the work continues to be maintained; The bottom of the head connection seat is provided with a cross card joint, and the cross card joint is connected with the root canal motor in a matching manner; when the root canal motor is driven, the intermediate section serves as a brush piece, and its inner wall forms a path with the file needle in the impedance circuit; The file needle includes a cutting edge and a straight rod that is connected with the file needle spur gear in a matching manner, and the cutting edge is processed from nitinol alloy.

2. The machine-use root canal file according to claim 1, Characterized in that: The position of the connection between the bottom of the intermediate section and the file needle is set as a conical surface.

3. The machine-use root canal file according to claim 1, Characterized in that: The length of the file needle is 17-19 mm, and the cutting edge includes a cutting edge with a triangular cross section.

4. The machine-use root canal file according to claim 1, Characterized in that: The cutting length of the cutting edge is 9 mm, the applied rotation speed is 150-300 rpm, and the tip diameter is 0.21 mm.

Images