JP2018143631A - Root canal forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a root canal forming device capable of notifying timing to perform operation of an operator during expanding and forming a root canal regardless of the operator's experience.SOLUTION: According to this invention, a root canal forming device 100 includes a handpiece 1, a motor driver 13 (a drive part), a control part 11, and a notification part 17 (an output part). The handpiece 1 holds a cutting tool 5 to be used for root canal formation of a tooth in a drivable manner in a head part 2. The motor driver 13 drives the cutting tool 5 held in the head part 2. The control part 11 controls the motor driver 13. The notification part 17 outputs suggestion information for urging the operator's operation according to predetermined timing.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a root canal former that enlarges and forms an inner wall of a root canal of a tooth.

  In the dental treatment, a treatment for enlarging and forming a root canal of a tooth may be performed. In the treatment, a root canal former in which a cutting tool called a file or a reamer is attached to the head portion of the handpiece is used, and the tooth root canal is enlarged by driving the cutting tool. When the root canal device drives the cutting tool to enlarge the root canal of the tooth, a root canal device that informs the driving state of the cutting tool by light, sound or vibration is proposed to the surgeon. (For example, Patent Document 1).

  In the root canal former disclosed in Patent Document 1, an LED (Light Emitting Diode), a speaker, a vibrator, and the like are provided as necessary to notify the driving state of the cutting tool. Specifically, in the root canal former disclosed in Patent Document 1, notification is made by changing the color of the LED that emits light when the cutting tool is driven in the forward direction and when the cutting tool is driven in the reverse direction, or a speaker. The sound output from is changed and notified.

Japanese Patent Laying-Open No. 2015-083116

  In treatment with a root canal former, the time required for the operation varies depending on the experience of the operator, and it is known that an inexperienced operator spends more time on the operation than an experienced operator. In addition, it is also known that inexperienced surgeons frequently cause accidents such as breakage of cutting tools. In order to prevent breakage of the cutting tool, when a load is applied to the cutting tool, it is essential to lift it from the root canal and release the load. It is difficult, and when it is lifted frequently, the cutting efficiency is lowered, and when the lifting frequency is low, the cutting tool is broken. Here, the specific operation of preventing the cutting tool from being broken and causing no reduction in cutting efficiency includes an operation of changing the position of the cutting tool (for example, moving up and down). However, in the conventional root canal former as disclosed in Patent Document 1, the timing of efficiently moving the cutting tool up and down during the formation of the root canal is not known simply by notifying the driving state of the cutting tool.

  The present invention has been made to solve the above-described problems, and a root canal former that can notify the timing of performing the operation of the operator during the expansion of the root canal regardless of the operator's experience. The purpose is to provide. It is also one of the purposes to notify the surgeon of the timing for performing the operation to promote the operation of reducing the load on the cutting tool and to prevent the cutting tool from breaking.

  A root canal former according to the present invention includes a handpiece for drivingly driving a cutting tool used for tooth root canal formation on a head portion, a driving portion for driving a cutting tool held on the head portion, and a driving portion. And an output unit that outputs suggestion information for encouraging the operator's action, and the output unit outputs the suggestion information according to a predetermined timing.

  Since the root canal former according to the present invention outputs the suggestion information in accordance with a predetermined timing, it is possible to notify the timing of performing the operation of the operator during the enlargement of the root canal.

It is a figure for demonstrating the timing of the suggestion information which the root canal generator which concerns on embodiment of this invention outputs. It is a figure for demonstrating the timing of the suggestion information which the root canal former which concerns on another embodiment of this invention outputs. It is the schematic which shows the structure of the external appearance of the root canal former which concerns on Embodiment 1 of this invention. It is a block diagram which shows the structure of the function of the root canal former which concerns on Embodiment 1 of this invention. It is a circuit diagram which shows the circuit structure of the root canal former which concerns on Embodiment 1 of this invention. It is the schematic diagram which showed the rotation direction of the cutting tool. It is a figure which shows the example of a display of the liquid crystal display panel provided in the display part shown in FIG. It is a figure for demonstrating the basic drive pattern used for the root canal former which concerns on Embodiment 1 of this invention. It is a figure for demonstrating an example of the drive sequence used for the root canal former which concerns on Embodiment 1 of this invention. 5 is a flowchart for explaining control based on a load applied to a cutting tool 5 in a root canal former according to Embodiment 2 of the present invention. It is a flowchart for demonstrating the control according to the position of the cutting tool in the root canal former which concerns on Embodiment 3 of this invention. It is the schematic which shows the structure of a cordless type root canal former.

(Overview)
The treatment for enlarging the root canal of the tooth is a very difficult treatment because the degree of curvature of the root canal and the situation where the root canal is calcified and blocked are different. The biggest cause of difficult treatment is the possibility of breakage of the cutting tool. An experienced surgeon appropriately moves the cutting tool up and down during the enlargement of the root canal. The effect of moving the cutting tool up and down here is to reduce the burden on the cutting tool, reduce the risk of breakage, make the cutting tool easier to enter along the shape of the root canal, For example, it is easy to release the biting into the root canal wall or shorten the cutting time itself. In particular, the up / down motion of pulling the cutting tool back to the crown side is clinically called pecking motion. Although overlapping with the above, the following effects can be obtained by performing the pecking motion in the enlarged formation of the root canal. (1) It is possible to enlarge the root canal safely by reducing the breakage of the cutting tool. (2) Since the cutting tool does not stay at the same position for a long period of time, the frequency of generating a dimple called ledge is set. (3) Elimination of restraint and biting in the inner wall of the root canal at the tip of the cutting tool, (4) Reduction of time for forming the root canal.

  An experienced surgeon knows when to change the position of the cutting tool during the root canal enlargement, and changes the position of the cutting tool at the appropriate time. Yes. On the other hand, an inexperienced operator does not know at what timing during the root canal enlargement formation, the operation of changing the position of the cutting tool, and the position of the cutting tool during the root canal enlargement formation is not known. In many cases, the changing operation is not consciously performed at all.

  Therefore, the root canal former according to the embodiment of the present invention outputs suggestion information (for example, sound or light) for encouraging the operation of the operator, so that the cutting tool can Prompt for movement to change position. That is, the root canal former according to the embodiment of the present invention generates a trigger signal for performing a pecking motion for moving the cutting tool up and down. Specifically, in the root canal former according to the embodiment of the present invention, light or sound from a light emitting diode (LED) or speaker provided in the control box is used as a trigger signal (indication information) at a certain time interval. The output prompts the surgeon to move.

  FIG. 1 is a diagram for explaining the timing of suggestion information output by a root canal former according to an embodiment of the present invention. FIG. 1 shows respective timing charts of a drive signal for the root canal former to drive the cutting tool, a sound output signal for outputting sound from the speaker, and a light output signal for causing the LED to emit light. First, the drive signal of the root canal former is changed from the OFF state to the ON state (timing a), and the cutting tool starts driving in the cutting direction (for example, clockwise). The root canal former starts processing to output a trigger signal when driving of the cutting tool is started.

  The sound output signal shown in FIG. 1 is changed from the OFF state to the ON state 0.5 seconds after the timing a, and the sound is output from the speaker for 0.5 seconds. Thereafter, the sound output signal is changed from the ON state to the OFF state, and after 0.5 seconds, a sound for 0.5 seconds is output from the speaker. Thereafter, until the drive signal of the root canal former is changed from the ON state to the OFF state, sound is output from the speaker at regular time intervals like a metronome. The surgeon performs an operation to change the position of the cutting tool according to the sound of a certain time interval output from the speaker (for example, the cutting tool is pulled up to the root canal side and inserted to the position before being pulled up. By resuming the cutting operation), it is possible to reduce the load on the cutting tool, particularly the stress that leads to breakage.

  Similarly, the light output signal shown in FIG. 1 is changed from the OFF state to the ON state 0.5 seconds after the timing a, and causes the LED to emit light for 0.5 seconds. Thereafter, the light output signal is changed from the ON state to the OFF state, and after 0.5 seconds, the LED is caused to emit light for 0.5 seconds. Thereafter, the LED is caused to emit light at regular time intervals until the root canal former drive signal is changed from the ON state to the OFF state. The surgeon performs an operation of changing the position of the cutting tool in accordance with the blinking of the light of the LED that emits light at regular time intervals. In addition, in the timing shown in FIG. 1, although the case where sound was output from the speaker based on the sound output signal and the LED was caused to emit light based on the light output signal, only one of them may be used.

  Next, in the root canal former according to another embodiment of the present invention, instead of outputting light or sound as a trigger signal at a certain time interval from an LED or speaker provided in the control box, a cutting tool is used. A trigger signal is output in accordance with the driving timing. FIG. 2 is a diagram for explaining the timing of the trigger signal output by the root canal former according to another embodiment of the present invention. FIG. 2 shows respective timing charts of a driving signal for driving the cutting tool by the root canal former, a sound output signal for outputting sound from the speaker, and a light output signal for causing the LED to emit light. First, the root canal former drive signal is changed from the OFF state to the cutting direction state (timing a), and the cutting tool starts driving in the cutting direction (for example, clockwise). Thereafter, the drive signal of the root canal former is changed from the cutting direction to the non-cutting state (timing b), and the cutting tool starts driving in the non-cutting direction (for example, counterclockwise). Thereafter, the drive signal of the root canal former alternately repeats the state in the cutting direction and the state in the non-cutting direction to drive the cutting tool in a twisted manner.

  The sound output signal is changed from the OFF state to the ON state at timing b, and the sound is output from the speaker. Thereafter, the sound output signal is changed to the OFF state while maintaining the ON state for a certain period (for example, 0.5 seconds). Further, the sound output signal is changed to the ON state every time the drive signal is changed from the cutting direction to the non-cutting state, and the sound is output from the speaker. That is, the root canal former outputs sound from the speaker at the timing when the cutting tool rotates in the non-cutting direction. The surgeon performs the operation of changing the position of the cutting tool in accordance with the sound output from the speaker, so that the cutting tool is driven at the timing of driving in the non-cutting direction to release the biting of the cutting tool into the inner wall of the root canal. The operation | movement which changes the position of this can be performed, and the stress concerning cutting tools, especially the stress which leads to a fracture can be reduced more.

  Similarly, the light output signal is changed from the OFF state to the ON state at timing b, and causes the LED to emit light. Thereafter, the optical output signal is maintained in the ON state for a certain period (for example, 0.5 seconds) and changed to the OFF state. Further, the light output signal causes the LED to emit light each time the drive signal is changed from the cutting direction to the non-cutting state. That is, the root canal former causes the LED to emit light at the timing when the cutting tool rotates in the non-cutting direction. The surgeon performs the operation of changing the position of the cutting tool in accordance with the light emission of the LED, thereby adjusting the position of the cutting tool at the timing of driving in the non-cutting direction in which the cutting tool bites into the inner wall of the root canal is released. The operation to change can be performed and the burden concerning a cutting tool, especially the stress which leads to a fracture can be reduced. In addition, at the timing shown in FIG. 2, although the case where sound was output from the speaker based on the sound output signal and LED was emitted based on the light output signal was described, only one of them may be used.

  Furthermore, the operator can easily insert the cutting tool along the shape of the root canal by changing the position of the cutting tool in accordance with the timing of the trigger signal output by the root canal former. The root canal shape is improved. Further, by performing this operation, the cutting tool blade is not placed at the same position, and the deformation of the root canal is reduced. After that, the cutting waste is easily discharged by performing the operation.

  In addition to simply outputting sound from the speaker as a trigger signal output from the root canal former, the tone (frequency, magnitude, rhythm, etc.) of the sound may be changed. In addition to simply causing the LED to emit light as a trigger signal output from the root canal former, it changes the blinking cycle, changes the light parameters (color shade, density), etc. The parameters (hue, brightness), etc. may be changed.

  The outline of the embodiment of the present invention described above will be described below more specifically with reference to the drawings. In the following description, not only when a trigger signal for prompting an operator's operation is output at a certain time interval timing or timing based on the driving state of the cutting tool, but also a driving pattern in which the control unit controls the driving unit. A case of outputting at a timing based on the driving sequence will also be described.

(Embodiment 1)
The dental treatment apparatus according to Embodiment 1 of the present invention is a root canal former including a root canal enlargement and root canal length measurement system incorporating a dental root canal treatment handpiece. However, the dental treatment apparatus according to the present invention is not limited to a root canal former, and can be applied to a dental treatment apparatus having a similar configuration.

[Configuration of dental treatment device]
FIG. 3 is a schematic diagram showing an external configuration of the root canal former according to Embodiment 1 of the present invention. FIG. 4 is a block diagram showing a functional configuration of the root canal former according to Embodiment 1 of the present invention. A root canal former 100 shown in FIG. 3 includes a handpiece 1, a motor unit 6, and a control box 9 for dental root canal treatment.

  A dental root canal treatment handpiece 1 includes a head portion 2, a narrow neck portion 3 connected to the head portion 2, and a grip portion 4 connected to the neck portion 3 and gripped by fingers. Yes. A motor unit 6 for rotationally driving a cutting tool 5 (file or reamer or the like) held by the head unit 2 is detachably connected to the base of the grip unit 4. A dental instrument 10 is configured with the motor unit 6 connected to the handpiece 1.

  As shown in FIG. 4, the motor unit 6 has a built-in micromotor 7, a power supply lead 71 for supplying power to the micromotor 7, and a signal for transmitting a signal to the root canal length measuring circuit 12 described later. It is connected to the control box 9 via a hose 61 that houses a lead wire 8 and the like. Here, the signal lead 8 is part of a conductor that is electrically connected to the cutting tool 5 through the motor unit 6 and the handpiece 1 and transmits an electric signal. The cutting tool 5 serves as one electrode of the root canal length measurement circuit 12.

  The control box 9 includes a control unit 11, a comparison circuit 110, a root canal length measurement circuit 12, a motor driver 13, a setting unit 14, an operation unit 15, a display unit 16, a notification unit 17, and the like. As shown in FIG. 3, the control box 9 is provided with a holder 10a for holding the instrument 10 when not in use on the side of the main body. In the control box 9, a foot controller 18 is connected to the control unit 11, and a lead wire 19 is connected to the root canal length measuring circuit 12. The lead wire 19 is drawn from the control box 9, but may be drawn so as to branch from the middle of the hose 61. An oral electrode 19a hung on the patient's lips is attached to the tip of the lead wire 19 in an electrically conductive state. The oral electrode 19a serves as the other electrode of the root canal length measurement circuit 12.

  The control unit 11 controls the entire root canal enlargement and root canal length measurement system, and the main part is composed of a microcomputer. A comparison circuit 110, a root canal length measurement circuit 12, a motor driver 13, a setting unit 14, an operation unit 15, a display unit 16, a notification unit 17, and a foot controller 18 are connected to the control unit 11. The control unit 11 controls the rotation direction of the cutting tool 5 that cuts the object to be cut. Specifically, the control unit 11 rotates forwardly to rotate the cutting tool 5 in a clockwise (also referred to as clockwise) direction, reverse rotation drive to rotate the cutting tool 5 in a counterclockwise (also referred to as counterclockwise) direction, and Any one of twist drive (reciprocating drive) control for alternately rotating the cutting tool 5 in the clockwise direction and the counterclockwise direction is performed. Here, the direction in which the cutting tool is rotated (clockwise direction or counterclockwise direction) is considered based on the case where the cutting tool 5 is attached to the head unit 2 from the cutting tool 5 side. Further, the control unit 11 changes the parameters of the clockwise rotation angle, the rotation speed, or the rotation angular speed (rotation number), the counterclockwise rotation angle, the rotation speed, or the rotation angular speed (rotation number), The drive for rotating the cutting tool 5 can be controlled.

  Here, the rotation angle may be defined by a rotation time (also referred to as a drive period) when the rotation angular velocity (number of rotations) is constant. In the following description, the rotation angle is used for explanation, but it may be replaced with the number of rotations. For example, setting the number of rotations of the cutting tool 5 to 1/2 rotation is the same as rotating the cutting tool 5 180 degrees. Further, when the rotational speed of the cutting tool 5 is constant at 120 times per minute, driving the cutting tool 5 for 0.25 seconds is the same as rotating the cutting tool 5 180 degrees. Strictly speaking, depending on the load applied by the cutting tool or the motor, for example, there is a case where the correspondence relationship between the control rotation time and the actual rotation angle has to be corrected, but this can be ignored in the practice of the present invention. In the following embodiments, the rotation speed is used to represent the rotation speed of the cutting tool 5. In addition, the number of rotations per minute (rpm: revolutions per minute) is used.

  The comparison circuit 110 is a configuration necessary for detecting a load applied to the cutting tool 5 and can be selectively provided when the load needs to be detected. The comparison circuit 110 can compare the load at any time when the cutting tool 5 is rotated clockwise or counterclockwise by the motor driver 13. Specifically, the comparison circuit 110 rotates the cutting tool 5 in a clockwise direction or a counterclockwise direction by a predetermined rotation angle (for example, 180 degrees), and then adds a load applied to the cutting tool 5 and a reference load or a predetermined load. Can be compared.

  The root canal length measurement circuit 12 is a configuration necessary for detecting the position of the tip of the cutting tool 5 in the root canal, and can be selectively provided when the position needs to be detected. is there. The root canal length measurement circuit 12 forms a closed circuit with the cutting tool 5 inserted into the root canal of the tooth as one electrode and the oral electrode 19a hung on the patient's lip as the other electrode. The root canal length measurement circuit 12 applies a measurement voltage between the cutting tool 5 and the oral electrode 19a, and measures the impedance between the cutting tool 5 and the oral electrode 19a, whereby the tip of the cutting tool 5 is measured. Can be detected. In addition, the electrical root canal length measuring method for measuring the impedance between the cutting tool 5 and the oral electrode 19a and measuring the root canal length is a known method, and the root canal forming device 100 according to Embodiment 1 is known. Any known electrical root canal length measurement method can be applied to the method.

  The motor driver 13 is connected to the micromotor 7 via the power supply lead wire 71 and controls the power supplied to the micromotor 7 based on a control signal from the control unit 11. The motor driver 13 controls the power supplied to the micromotor 7 to control the rotation direction, rotation speed, rotation angle, etc. of the micromotor 7, that is, the rotation direction, rotation speed, rotation angle, etc. of the cutting tool 5. Can do. In the root canal former 100, at least the motor driver 13 and the micromotor 7 constitute a drive unit.

  The setting unit 14 sets a reference for controlling the rotation direction, the rotation number, the rotation angle, and the like of the cutting tool 5. The setting unit 14 also compares a load applied to the cutting tool 5 with a predetermined load (a load for starting a process for outputting a trigger signal for prompting an operator's operation) to be compared with a reference load (cutting). The driving of the tool 5 is stopped or the load for switching the driving such as turning the cutting tool 5 in the non-cutting rotation direction), the timing and the like are set. Further, the setting unit 14 uses the root canal length measurement circuit 12 to output the trigger signal for prompting the surgeon to operate the root apex position in advance as a reference position and a position at a predetermined distance from the apical position. Or a position for starting the processing). In addition, the root canal former 100 sets a reference position in the setting unit 14 in advance, so that when the tip of the cutting tool 5 reaches the reference position, the rotation direction, the rotation speed, and the rotation angle of the cutting tool 5. Parameters can be changed.

  The operation unit 15 can set parameters such as whether or not to perform root canal length measurement, in addition to setting parameters for the rotation speed and rotation angle of the cutting tool 5. Further, the operation unit 15 can manually perform switching between normal rotation driving and reverse rotation driving, and switching between normal rotation driving and twist driving.

  As will be described later, the display unit 16 displays the position of the tip of the cutting tool 5 in the root canal, the rotation direction, the rotation speed, the rotation angle, and the like of the cutting tool 5. Furthermore, information for the notification unit 17 to notify the surgeon can be displayed on the display unit 16.

  The alerting | reporting part 17 alert | reports the drive state of the cutting tool 5 currently performed by the control part 11 by light, a sound, a vibration, etc. Furthermore, the alerting | reporting part 17 can output the trigger signal for encouraging operation | movement of an operator by light, a sound, a vibration, etc. Specifically, the notification unit 17 is provided with an LED, a speaker, a vibrator, or the like as necessary in order to notify the driving state of the cutting tool 5 and emits light by driving in the forward direction and driving in the reverse direction. Change the color of the sound or change the sound output from the speaker. In addition, the notification unit 17 outputs a trigger signal for encouraging the operator's action by, for example, causing the LED to emit light at a certain time interval or outputting a sound at a certain time interval, and moves the cutting tool up and down. The operator can be urged to move (peking motion) or the like. Of course, the notification unit 17 may prompt the operator to perform the same operation by causing the LED to emit light and outputting sound at regular time intervals. In addition, the notification part 17 does not need to provide LED, a speaker, a vibrator | oscillator, etc. separately, when the display part 16 can display the drive state of the cutting tool 5 with respect to an operator. Further, the trigger signal may be output to the display unit 16 without separately providing an LED, a speaker, a vibrator, or the like that outputs a trigger signal for prompting the surgeon's operation.

  The foot controller 18 is an operation unit that performs drive control of the cutting tool 5 by the micromotor 7 by a stepping operation. The drive control of the cutting tool 5 by the micromotor 7 is not limited to the foot controller 18, and an operation switch (not shown) is provided in the grip portion 4 of the handpiece 1, and the operation switch and the foot controller 18 are provided. And the drive control of the cutting tool 5 may be performed in combination. In addition, for example, when the foot controller 18 is being stepped on, the root canal length measurement circuit 12 detects that the cutting tool 5 has been inserted into the root canal, whereby the cutting tool 5 is rotated. You may make it start.

  In addition, although the control box 9 of the root canal former 100 has been described with respect to a configuration in which the control box 9 is placed on a tray table or a side table installed on the side of a dental examination table, the present invention is not limited thereto. The control box 9 may be incorporated in the tray table or the side table.

  Next, the circuit configuration of the root canal former 100 that controls the driving of the cutting tool 5 will be described in more detail. FIG. 5 is a circuit diagram showing a circuit configuration of root canal former 100 according to Embodiment 1 of the present invention. The root canal former 100 shown in FIG. 5 includes a micromotor 7, a control unit 11, a comparison circuit 110, a root canal length measurement circuit 12, a motor driver 13, and a setting unit 14 related to the drive control of the cutting tool 5. It is shown.

  Further, the motor driver 13 includes a transistor switch 13a, a transistor driver circuit 13b, a rotation direction changeover switch 13c, and a load detection resistor 13d. Although the rotation direction changeover switch 13c is described as a relay element, a motor drive circuit may be configured by a semiconductor switch element such as an FET. The setting unit 14 includes a variable resistor 14a for setting a load (reference load and a predetermined load), a variable resistor 14b for setting a duty, and a variable resistor 14c for setting a position (reference position and a predetermined position). The setting unit 14 includes a configuration for setting a rotation angle (or a rotation time) indicating timing for comparing the load detected by the comparison circuit 110 with a reference load or a predetermined load. Not shown in FIG. Further, the root canal former 100 shown in FIG. 5 is connected to the main power source 20 and the main switch 21. Although not shown, the cutting tool 5 is held by the micromotor 7 via an appropriate gear mechanism or the like.

  The transistor driver circuit 13b is operated by a control signal output from the port 11a of the control unit 11, and drives the micro motor 7 by controlling on / off of the transistor switch 13a. The micromotor 7 rotates clockwise or counterclockwise depending on the state of the rotation direction selector switch 13c. When the control signal output from the port 11a of the control unit 11 is, for example, a pulse waveform repeated at a constant period, the width of the pulse waveform, that is, the duty ratio is adjusted by the variable resistance 14b for setting the duty of the setting unit 14 Is done. The micromotor 7 drives the cutting tool 5 at a rotational speed corresponding to this duty ratio.

  The rotation direction change-over switch 13c is a control signal output from the port 11b of the control unit 11, and switches whether the cutting tool 5 is driven in the clockwise direction or the counterclockwise direction. The controller 11 detects the load applied to the cutting tool 5 based on the amount of current (or voltage value) of the load detection resistor 13d input to the port 11c. Therefore, the load detection resistor 13d functions as a load detection unit that detects a load applied to the cutting tool 5. The load detection unit is not limited to a configuration that detects a load applied to the cutting tool 5 based on the amount of current (or voltage value) of the load detection resistor 13d. For example, a torque is applied to a drive portion of the cutting tool 5. Another configuration such as a configuration in which a sensor is provided to detect a load applied to the cutting tool 5 may be used. The detected load is converted into, for example, a torque value applied to the cutting tool 5 by the control unit 11 and displayed on the display unit 16. The comparison circuit 110 compares the torque value converted by the control unit 11 with the torque value set using the load setting variable resistor 14a. Of course, the comparison circuit 110 may be configured to directly compare the current amount (or voltage value) of the load detection resistor 13d and the current amount (or voltage value) of the variable resistor 14a without converting the torque value.

  Further, the control unit 11 inputs the root canal length measurement data measured by the root canal length measurement circuit 12 to the port 11d. Therefore, the root canal length measurement circuit 12 functions as a position detection unit that detects the position of the tip of the cutting tool 5 in the root canal. Moreover, the control part 11 outputs the load added to the cutting tool 5 detected by the load detection part to the comparison circuit 110 from the port 11e, and inputs the comparison result which the comparison circuit 110 compared with the reference load or the predetermined load from the port 11e. . Therefore, the comparison circuit 110 functions as a load comparison unit that compares the load detected by the load detection unit with a reference load or a predetermined load. Note that the control unit 11 may combine the configuration described in the analog circuit as software in one microcomputer.

  FIG. 6 is a schematic diagram showing the rotation direction of the cutting tool 5. In the rotation direction of the cutting tool 5 shown in FIG. 6, the driving in the clockwise direction 5 a that rotates the cutting tool 5 clockwise from the side of the cutting tool 5 attached to the head portion 2 toward the tip of the cutting tool 5. The driving in the counterclockwise direction 5b that rotates counterclockwise is shown. In addition, the drive which rotates the cutting tool 5 in the clockwise direction 5a at a predetermined rotation angle and the drive which rotates the cutting tool 5 in the counterclockwise direction 5b at a predetermined rotation angle alternately. Twist drive.

  Next, the display of the liquid crystal display panel provided in the display unit 16 shown in FIG. 3 will be described. FIG. 7 is a diagram showing a display example of the liquid crystal display panel provided in the display unit 16 shown in FIG.

  The display unit 16 shown in FIG. 7 is a liquid crystal display panel, and includes a dot display unit 52 including a number of elements for displaying the measured root canal length in detail, and the root canal length divided into a plurality of zones in stages. A zone display unit 54 for displaying the boundary, a boundary display unit 56 indicating the boundary of each zone, and an arrival rate display unit 58 for displaying the arrival rate up to the apex.

  The dot display unit 52 displays elements in order from top to bottom as the tip of the cutting tool 5 approaches the apex. The position of the scale “APEX” represents the position of the apex, and when the element reaches the scale, it indicates that the tip of the cutting tool 5 has almost reached the position of the apex.

  The display unit 16 includes a dot display unit 60 including a number of elements for displaying the load detected by the load detection unit (load detection resistor 13d, see FIG. 5), and the load divided into a plurality of zones. A zone display unit 62 for displaying in stages is provided. The dot display unit 60 displays elements in order from top to bottom as the load detected by the load detection unit increases.

  For example, on the dot display unit 60, the load of the cutting tool 5 applied when cutting a tooth is displayed by an element 60a indicated by diagonal lines.

  In addition, the dot display unit 60 may display an element 60b corresponding to a reference load or a predetermined load set by the setting unit 14 (see FIG. 5). By displaying the element 60b on the dot display unit 60, it is possible to visualize how much margin exists in the load detected by the load detection unit with respect to the reference load or the predetermined load.

  Further, the display unit 16 displays a numerical value display unit 64 that displays numerical values of the rotational speed of the cutting tool 5 and the load applied to the cutting tool 5, the direction of rotation of the cutting tool 5 (clockwise direction, counterclockwise direction), and A rotation display unit 68 that displays the magnitude of the rotation speed of the cutting tool 5 is provided.

  In the root canal former 100 according to the first embodiment, as shown in FIG. 2, even if a trigger signal for prompting the operation of the operator is output at a constant time interval as shown in FIG. You may output with the timing (for example, timing when the said cutting tool rotates in a non-cutting direction) based on the drive state of a cutting tool. Furthermore, the root canal former 100 according to the first embodiment may output a trigger signal for prompting the operation of the operator at a timing based on a drive pattern or drive sequence in which the control unit 11 controls the motor driver 13. .

  First, the driving of the cutting tool 5 can be classified into five basic driving patterns described below. Specifically, FIG. 8 is a diagram for explaining a basic drive pattern used in the root canal former 100 according to Embodiment 1 of the present invention. The arrows shown in FIG. 8 indicate the rotation direction of the cutting tool 5. In FIG. 8, the rotation direction is described with reference to the case where the cutting tool 5 attached to the head unit 2 is directed from the side of the cutting tool 5 toward the tip. Note that the normal cutting tool 5 can cut the tooth root canal when rotated in the clockwise direction, but cannot rotate the tooth root canal or can cut the cutting efficiency when rotated in the counterclockwise direction. descend. Therefore, hereinafter, the clockwise direction is the cutting direction, the counterclockwise direction is the non-cutting direction, the clockwise rotation angle is the cutting direction rotation angle, and the counterclockwise rotation angle is the non-cutting rotation angle. Define as

  The basic drive pattern shown in FIG. 8A rotates 180 degrees in the cutting direction and 90 degrees in the non-cutting direction. When driving the cutting tool 5 with the basic driving pattern shown in FIG. 8A, the root canal former 100 is triggered at the timing (circle in the figure) of starting driving that rotates 90 degrees in the non-cutting direction. A sound that is a signal (for example, a sound of 0.5 seconds) is output from a speaker. Then, when the rotation in the non-cutting direction is finished, the output from the speaker is stopped. Here, the trigger signal is output at the timing when the trigger signal is continuously output during the rotation in the non-cutting direction, and during the short period when the drive direction is switched to the non-cutting direction. Output case. When the trigger signal is continuously output during the rotation in the non-cutting direction, the surgeon performs the pecking motion during the period during which the trigger signal is output. In the case where a trigger signal is output in a short period of the moment when the driving direction is switched to the non-cutting direction, the surgeon immediately performs a pecking motion if the trigger signal is output. The timing is the same hereinafter.

  The basic drive pattern shown in FIG. 8B rotates 90 degrees in the cutting direction and 180 degrees in the non-cutting direction. When driving the cutting tool 5 with the basic driving pattern shown in FIG. 8B, the root canal former 100 is triggered at the timing of starting driving to rotate 180 degrees in the non-cutting direction (circle in the figure). The sound that is the signal is output from the speaker. Then, when the rotation in the non-cutting direction is finished, the output from the speaker is stopped.

  The basic driving pattern shown in FIG. 8C rotates 180 degrees in the cutting direction and 180 degrees in the non-cutting direction. When driving the cutting tool 5 with the basic driving pattern shown in FIG. 8C, the root canal former 100 is triggered at the timing of starting driving to rotate 180 degrees in the non-cutting direction (circle in the figure). The sound that is the signal is output from the speaker. Then, when the rotation in the non-cutting direction is finished, the output from the speaker is stopped.

  The basic drive pattern shown in FIG. 8D does not rotate in the cutting direction but rotates 360 degrees in the non-cutting direction. When driving the cutting tool 5 with the basic drive pattern shown in FIG. 8D, the root canal former 100 does not output a sound as a trigger signal from the speaker according to the drive pattern. In the case of FIG. 8D, the root canal former 100 outputs a sound as a trigger signal from the speaker at a predetermined timing.

  The rotation angle described in the basic drive pattern shown in FIG. 8 is an exemplification, and at least the rotation angle in the cutting direction is larger than the rotation angle in the non-cutting direction. That's fine. Further, the basic drive pattern shown in FIG. 8B only needs to have at least the rotation angle in the cutting direction smaller than the rotation angle in the non-cutting direction. The basic drive pattern shown in FIG. 8C only needs to have the same rotation angle in the cutting direction and rotation angle in the non-cutting direction.

  The cutting tool 5 is driven based on a drive sequence that combines the drive patterns shown in FIG. The root canal former 100 includes at least one drive pattern (FIGS. 8A to 8C) having a drive for rotating the cutting tool 5 in the non-cutting direction among a plurality of drive patterns included in the drive sequence. . Then, the root canal former 100 outputs a sound, which is a trigger signal, from the speaker at any timing during a period in which a drive pattern having a drive for rotating the cutting tool 5 in the non-cutting direction is executed. FIGS. 8A to 8C show an example in which a sound that is a trigger signal is output from a speaker at a timing when rotation in a non-cutting direction is started. Of course, the timing at which the sound that is the trigger signal is output from the speaker is not limited to the timing at which the rotation in the non-cutting direction is started, and may be the timing at which the cutting tool 5 is driven in the non-cutting direction or at the end. The timing for stopping the sound output from the speaker is the same.

  Furthermore, an example of a drive sequence used for the root canal former 100 according to Embodiment 1 will be described. FIG. 9 is a diagram for explaining an example of a drive sequence used in the root canal former 100 according to Embodiment 1 of the present invention. The solid line arrows shown in FIG. 9 indicate the rotation direction of the cutting tool, and the broken line arrows indicate the repetition of SET (described later) combining drive patterns. Also in FIG. 9, the rotation direction is described with reference to a case where the cutting tool attached to the head portion is directed to the tip direction of the cutting tool. Therefore, the clockwise arrow indicates the rotation of the cutting tool in the cutting direction, and the counterclockwise arrow indicates the rotation of the cutting tool in the non-cutting direction.

  The drive sequence shown in FIG. 9 is composed of SET1 and SET2, and SET2 is executed after SET1 is executed, and after returning to SET1 after SET2 is executed, it is repeatedly executed alternately thereafter. SET1 is configured by repeating the basic drive pattern shown in FIG. 8A four times. SET2 is configured by repeating the basic drive pattern shown in FIG. 8B four times. The root canal former 100 outputs a sound that is a trigger signal during a period in which SET2 is being executed, and does not output a sound that is a trigger signal in a period in which SET1 is being executed. The period in which SET2 is executed is a period in which a drive pattern in which the rotation angle by driving in the non-cutting direction is larger than the rotation angle by driving in the cutting direction is executed. Furthermore, the period during which SET2 is executed is a period in which the accumulated difference value obtained by accumulating the difference between the rotation angle by driving in the cutting direction and the rotation angle by driving in the non-cutting direction becomes the rotation angle in the non-cutting direction. Therefore, this period is a period during which the cutting tool 5 does not bite into the inner wall of the root canal and the operator can easily perform the vertical movement of the cutting tool 5.

  The timing at which sound is output during the period in which SET2 is being executed is, for example, the timing at which driving of the cutting tool 5 is started in SET2 (circles in the figure). Thereby, the root canal former 100 can suggest that it switched to the period when SET2 is performed. The surgeon may move the cutting tool 5 up and down according to the trigger signal. Note that the timing for outputting sound during the period in which SET2 is being executed may be the entire period in which SET2 is being executed. That is, the sound is continuously emitted during the period in which SET2 is being executed, and the sound is not output (mute) in the period in which SET1 is being executed. The surgeon may move the cutting tool 5 up and down at any timing during the period in which sound is produced. The trigger signal output during the period in which SET2 is being executed may be light emission of an LED instead of sound output.

  In addition, when driving the cutting tool 5 with SET2, the root canal former 100 is not limited to the case where the sound that is the trigger signal is output from the speaker at the timing when the driving that first rotates 180 degrees in the non-cutting direction is started. . When the root canal former 100 drives the cutting tool 5 with SET 2, the root canal former 100 selects from the timing of starting the driving that rotates 180 degrees in the non-cutting direction for the second and subsequent times, and outputs a sound as a trigger signal from the speaker. Good.

  As described above, the root canal former 100 has a cumulative difference value obtained by accumulating a difference between a rotation angle by driving in the cutting direction and a rotation angle by driving in the non-cutting direction for each drive pattern as A sound as a trigger signal is output from the speaker at any timing during a period in which the drive pattern is executed (period in which SET2 is executed). In the diagram shown in FIG. 9, an example in which a sound that is a trigger signal is output from a speaker at a timing at which the period during which SET2 is driven starts. Then, the sound output is stopped as the period during which SET2 is executed ends. Of course, the timing at which the sound that is the trigger signal is output from the speaker is not limited to the timing at which the period in which SET2 is driven is started, but may be the entire period in which SET2 is being executed, or the timing at which the period is ended or ended.

  In addition, the root canal former 100 may be configured to output a trigger signal for urging the operator's operation according to a predetermined timing without being limited to the driving sequence. Specifically, the root canal former 100 outputs a trigger signal at a certain time interval timing or outputs a trigger signal at a timing when the cutting tool rotates in a non-cutting direction. It is possible to notify the timing of performing the operation of the operator to reduce the burden on the cutting tool.

  The operation of the surgeon not only reduces the burden on the cutting tool 5 during the formation of the root canal, but also promotes the operation for safely performing the formation of the root canal and the formation of the root canal. It may be an operation to do this. Specifically, the operation of the surgeon may be not only an operation for changing the position of the cutting tool 5 but also an operation for changing the drive of the cutting tool 5. Further, the operation of changing the position of the cutting tool 5 is not only the operation of moving the cutting tool 5 back to the crown side, but also the operation of simply lifting the cutting tool 5 to the crown side, For example, an operation of pushing toward the apex side or an operation of moving the cutting tool 5 left and right may be used.

(Embodiment 2)
In addition to the control described in the first embodiment of the present invention for outputting a trigger signal (suggesting information) for prompting an operator's operation (for example, pecking motion) while the cutting tool 5 is being driven, The case where the control based on the applied load is combined will be described. Since root canal former 100 according to the second embodiment uses the same configuration as root canal former 100 according to the first embodiment shown in FIGS. 3 to 5, detailed description is repeated using the same reference numerals. Absent.

  FIG. 10 is a flowchart for explaining control based on a load applied to the cutting tool 5 in the root canal forming device 100 according to Embodiment 2 of the present invention. First, the control unit 11 reads a preset drive sequence, and drives the cutting tool 5 in order from the drive pattern adopted in SET1 of the read drive sequence (step S101). For example, the control unit 11 has a drive sequence shown in FIG. 9 set in advance, and drives the cutting tool 5 according to the drive pattern adopted in the drive sequences SET1 and SET2. Specifically, the control unit 11 rotates the cutting tool 5 by 180 degrees × 4 times = 360 degrees in the cutting direction as a result of driving SET1 in the driving sequence.

  Next, the control part 11 acquires the load added to the cutting tool 5 detected by the load detection part (step S102). Specifically, the control unit 11 detects a load applied when the cutting tool 5 is driven by being rotated in the cutting direction by the load detection unit, and acquires the detected load. Next, the comparison circuit 110 compares the acquired load with the predetermined load set by the setting unit 14 (step S103). Thereby, it is possible to detect that a load more than necessary is applied to the cutting tool 5 in the driving sequence. Here, the predetermined load is set according to the type of the cutting tool 5, and is set to a value that can achieve the purpose of preventing the cutting tool 5 from being damaged.

  When it is determined that the acquired load is equal to or greater than the predetermined load (step S103: YES), the control unit 11 is configured to generate a sound (trigger signal) for prompting the operator to change the position of the cutting tool in order to reduce the load. ) Is started (step S104). That is, the root canal former 100 according to the second embodiment does not start the control for outputting the trigger signal for prompting the operation of the operator immediately after the driving of the cutting tool 5 is started. When a load greater than or equal to a predetermined load is applied, control for outputting a trigger signal for prompting the operation of the surgeon is started. Therefore, the root canal former 100 according to the second embodiment can output a trigger signal for urging the operator's operation when the burden on the cutting tool needs to be reduced. The output of the sound (trigger signal) that is started in the process of step S104 is performed at the timing shown in FIGS. 1 and 2 even if it is performed at the timing of starting the operation of SET2 shown in FIG. 9 (circled in the drawing). You may go.

  When it is determined that the acquired load is less than the predetermined load (step S103: NO), the control unit 11 stops the control to output a sound (trigger signal) for prompting the operator to change the position of the cutting tool. (Step S105). In addition, the control part 11 continues a stop state by the process of step S115, when the control which outputs a sound (trigger signal) has stopped before performing the process of step S105.

  Next, the control unit 11 determines whether or not an operation to end driving is input from the operation unit 15 (step S106). When an operation to end driving is input from the operation unit 15 (step S106: YES), the control unit 11 stops driving and sound output (step S107). When the operation to end the drive is not input from the operation unit 15 (step S106: NO), the control unit 11 proceeds to the process of step S102.

  As described above, the root canal former 100 further includes the load detection unit (load detection resistor 13d) that detects the load applied to the cutting tool 5, and the load detected by the load detection unit is equal to or higher than a predetermined load. Then, output of a trigger signal (for example, sound or light) is started. Therefore, the root canal former 100 according to the second embodiment can output a trigger signal for encouraging the operator's operation in accordance with the load applied to the cutting tool 5, and reduces the load applied to the cutting tool 5. When it is necessary to do this, the trigger signal can be output appropriately.

  Note that the root canal former 100 does not start outputting a trigger signal (for example, sound or light) when the load detected by the load detection unit exceeds a predetermined load, but the type of trigger signal to be output. May be changed. For example, when the load detected by the load detection unit exceeds a predetermined load, the root canal former 100 changes the type of sound (eg, length, tone, etc.) or outputs it at the timing of a certain time interval. The sound may be output at a timing based on the drive sequence.

(Embodiment 3)
In addition to the control described in the first embodiment of the present invention for outputting a trigger signal (suggestion information) for prompting an operator's operation (for example, pecking motion) while the cutting tool 5 is being driven, root canal length measurement The case where the control based on the position of the cutting tool 5 acquired from the circuit 12 (the position in the root canal at the tip of the cutting tool 5 obtained by the root canal length measurement circuit 12 (position from the apical position)) is combined will be described. To do. The root canal former 100 according to the third embodiment uses the same configuration as the root canal former 100 according to the first embodiment shown in FIGS. Do not repeat.

  FIG. 11 is a flowchart for explaining control according to the position of the cutting tool 5 in the root canal forming device 100 according to Embodiment 3 of the present invention. First, the control unit 11 reads a preset drive sequence, and drives the cutting tool 5 in order from the drive pattern adopted in SET1 of the read first drive sequence (step S111). For example, the control unit 11 has a drive sequence shown in FIG. 9 set in advance, and drives the cutting tool 5 according to the drive pattern adopted in the drive sequences SET1 and SET2. Specifically, the control unit 11 rotates the cutting tool 5 by 180 degrees × 4 times = 360 degrees in the cutting direction as a result of driving SET1 in the driving sequence.

  Next, the control unit 11 acquires the position of the cutting tool 5 (position from the apex position) obtained by the root canal length measurement circuit 12 (step S112). The controller 11 determines whether or not the position of the cutting tool 5 acquired from the root canal length measurement circuit 12 has reached a predetermined position (step S113). Here, the predetermined position is set to a value that can achieve the purpose of preventing the cutting tool 5 from being damaged. For example, the predetermined position is a position where an excessive load is applied to the cutting tool 5 at a position where the root canal begins to be bent.

  When it is determined that the position of the acquired cutting tool 5 has reached a predetermined position (step S113: YES), the control unit 11 generates a sound (trigger signal) for prompting the operator to change the position of the cutting tool. The output control is started (step S114). That is, in the root canal forming device 100 according to the third embodiment, even if the driving of the cutting tool 5 is started, control for outputting a trigger signal for prompting the operation of the operator is not started immediately, but the cutting tool 5 is started. When the position reaches the predetermined position, control is started to output a trigger signal for urging the operator's action. Therefore, in the root canal former 100 according to the third embodiment, when the cutting tool 5 reaches a position where it is considered necessary to reduce the burden on the cutting tool, a trigger signal for urging the operator's operation Can be output. The output of the sound (trigger signal) that is started in the process of step S114 is performed at the timing shown in FIGS. 1 and 2 even if it is performed at the timing of starting the driving of SET2 shown in FIG. You may go.

  When it is determined that the acquired position of the cutting tool 5 has not reached or passed through the predetermined position (step S113: NO), the control unit 11 prompts the operator to change the position of the cutting tool. The control for outputting the sound (trigger signal) is stopped (step S115). In addition, the control part 11 continues a stop state by the process of step S115, when the control which outputs a sound (trigger signal) has stopped before performing the process of step S115.

  Next, the control unit 11 determines whether or not an operation to end driving is input from the operation unit 15 (step S116). When an operation to end driving is input from the operation unit 15 (step S116: YES), the control unit 11 stops driving and sound output (step S117). When the operation to end the driving is not input from the operation unit 15 (step S116: NO), the control unit 11 proceeds to the process of step S112.

  As described above, the root canal former 100 further includes the root canal length measurement circuit 12 that detects the position of the tip of the cutting tool 5 in the root canal, and the position detected by the root canal length measurement circuit 12 is determined by the operation. When a person reaches a predetermined position set in advance, the output of a trigger signal (for example, sound or light) is started. Therefore, the root canal former 100 according to the third embodiment can output a trigger signal for encouraging the operation of the operator according to the position of the cutting tool 5, and reduces the load applied to the cutting tool 5. Therefore, the trigger signal can be appropriately output at a necessary position.

  The root canal former 100 does not start outputting a trigger signal (for example, sound or light) when the position detected by the root canal length measurement circuit 12 reaches a predetermined position, but outputs a trigger. The type of signal may be changed. For example, when the position detected by the root canal length measurement circuit 12 reaches a predetermined position, the root canal former 100 changes the type of sound (for example, length, tone, etc.) or at the timing of a certain time interval. The output sound may be output at a timing based on the drive sequence.

(Modification)
Furthermore, in the root canal forming device 100 according to the first to third embodiments, the configuration in which the handpiece 1 is connected to the control box 9 via the hose 61 has been described, but the present invention is limited to this. It may be configured as a cordless type root canal former. FIG. 12 is a schematic view showing a configuration of a cordless type root canal former. The cordless type root canal former shown in FIG. 12 incorporates a control system corresponding to a battery pack, a micromotor, and a control box in the grip portion 4 of the handpiece 1, and various operation portions are provided on the surface of the grip portion 4. . Further, the cordless type root canal former is provided with a display unit 16 and a not-illustrated notification unit in the grasping unit 4. Therefore, the surgeon is driving the cutting tool 5 in the cutting direction or the non-cutting direction without greatly changing the line of sight, and what is the current position of the cutting tool 5, the cutting tool Information such as how much load is applied to 5 and what is the rotational speed can be confirmed on the display unit 16. Further, even a cordless type root canal former can output a trigger signal (suggestion information) for prompting an operator's action from a notification unit (for example, a speaker). Furthermore, a trigger signal for prompting the operation of the operator may be output by changing the color of the display unit 16 or the like. Although not shown, the lead wire 19 for the oral electrode 19 a may be led out from the grip portion 4.

  In the root canal former 100 according to the first to third embodiments, the case where the micromotor 7 is used as the power source for driving the cutting tool 5 has been described. However, the present invention is not limited to this, and the air motor It may be another drive source such as.

  In root canal former 100 according to the first to third embodiments, at least one set value is stored in FIG. 4 from recipes that store set values such as a drive sequence, a predetermined load, a predetermined position, a reference load, and a reference position. It may be configured to be set by the setting unit 14 shown. For example, the setting unit 14 may be configured to automatically set a setting value such as a driving sequence from a predetermined recipe by selecting the sex and height of the patient. Further, the setting unit 14 may be configured to previously store setting values such as a driving sequence preferred by the surgeon as a recipe, or to store setting values such as an optimal driving sequence for each patient in advance as a recipe.

  Furthermore, in the root canal forming device 100 according to the first to third embodiments, the drive sequence, the predetermined load, the predetermined position, the reference load, the reference position, and the like are set according to the type of the cutting tool 5 held in the head unit 2. A value is stored in the setting unit 14 as a recipe in advance, and a recipe stored based on the type of the cutting tool 5 held by the operator on the head unit 2 is read from the setting unit 14, so that a drive sequence or the like can be obtained. A configuration in which a set value is set may be used. Of course, the setting unit 14 is provided with a sensor capable of identifying the type of the cutting tool 5 in the head unit 2 and reads a recipe stored based on a detection result from the sensor, thereby setting a drive sequence or the like. It may be configured to set a value.

  Moreover, you may comprise combining the structure of the root canal former 100 which concerns on Embodiment 1-3 suitably. For example, in the root canal former 100 in which the second embodiment and the third embodiment are combined, the load applied to the cutting tool 5 detected by the load detection unit and the position of the cutting tool 5 detected by the root canal length measuring circuit 12 are set. In response, control for outputting a trigger signal for prompting the operation of the surgeon may be started.

  Furthermore, in the root canal forming device 100 according to the first to third embodiments, the timing for outputting the trigger signal (suggestion information) for prompting the operation of the operator is the timing for starting the driving of the cutting tool 5 in the non-cutting direction. However, the present invention is not limited to this. For example, the root canal former 100 may output the trigger signal for urging the operator's operation during or after driving the cutting tool 5 in the non-cutting direction. Further, the root canal former 100 outputs a trigger signal for urging the operator to operate at a timing at which driving of the cutting tool 5 is started in the cutting direction, and during or after driving of the cutting tool 5 in the cutting direction. It may be the timing.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  DESCRIPTION OF SYMBOLS 1 Handpiece, 2 Head part, 3 Neck part, 4 Gripping part, 5 Cutting tool, 6 Motor unit, 7 Micro motor, 8 Signal lead wire, 9 Control box, 10 Instrument, 10a Holder, 11 Control part, 11a to 11d ports, 12 root canal length measurement circuit, 13 motor driver, 13a transistor switch, 13b transistor driver circuit, 13c rotation direction selector switch, 13d load detection resistor, 14 setting unit, 14a, 14b, 14c variable resistor, 15 Operation unit, 16 display unit, 17 notification unit, 18 foot controller, 19 lead wire, 19a oral electrode, 20 main power source, 21 main switch, 52, 60 dot display unit, 54, 62 zone display unit, 56 boundary display unit, 58 arrival rate display, 60a element, 61 64, numerical display, 68 rotation display, 71 power supply lead, 100 root canal former, 110 comparison circuit.

Claims (15)

A hand piece that holds the cutting tool used for tooth root canal formation on the head portion in a drivable manner;
A drive unit for driving the cutting tool held by the head unit;
A control unit for controlling the driving unit;
An output unit that outputs suggestion information for encouraging the operation of the surgeon,
The output unit is a root canal former that outputs the suggestion information in accordance with a predetermined timing.   The root canal former according to claim 1, wherein the predetermined timing is a timing at a constant time interval.   The root canal former according to claim 1, wherein the predetermined timing is a timing at which the cutting tool rotates in a non-cutting direction opposite to a cutting direction in which a cutting target is cut. The control unit controls the driving unit based on a driving sequence;
The driving sequence includes a plurality of driving patterns,
The plurality of drive patterns include at least one drive pattern having a drive for rotating the cutting tool in a non-cutting direction opposite to a cutting direction for cutting a cutting object;
The root canal former according to claim 1, wherein the predetermined timing is any timing of a period in which a drive pattern having a drive for rotating the cutting tool in the non-cutting direction is executed. The control unit controls the driving unit based on a driving sequence;
The driving sequence includes a plurality of driving patterns,
At least one drive pattern of the plurality of drive patterns is different from other drive patterns,
The plurality of drive patterns include a drive pattern for rotating the cutting tool in a cutting direction for cutting a workpiece and a drive for rotating the cutting tool in a non-cutting direction opposite to the cutting direction. Including at least one
The said predetermined timing is any timing of the period when the rotation angle by the drive of the said non-cutting direction is performed with the drive pattern larger than the rotation angle by the drive of the said cutting direction. Root canal former.   The root canal former according to claim 4 or 5, wherein at least one parameter among the plurality of drive patterns is predetermined for each drive pattern among a rotation angle, a rotation angular velocity, and a repetition count.   The plurality of drive patterns are different in each drive pattern in a difference between a rotation angle by driving in the cutting direction and a rotation angle by driving in the non-cutting direction in one repetition. A root canal former according to any one of the preceding claims.   The root canal former according to any one of claims 3 to 7, wherein the timing for outputting the suggestion information is a timing for starting rotation in the non-cutting direction. A load detecting unit for detecting a load applied to the cutting tool;
The root canal former according to any one of claims 1 to 8, wherein the output unit starts outputting the suggestion information when a load detected by the load detection unit exceeds a predetermined load. A position detector for detecting a position in the root canal of the tip of the cutting tool obtained by electrical root canal length measurement;
The root canal former according to any one of claims 1 to 9, wherein the output unit starts outputting the suggestion information when the position detected by the position detection unit reaches a predetermined position.   The root canal former according to any one of claims 1 to 10, wherein the suggestion information is a sound.   The root canal former according to any one of claims 1 to 10, wherein the suggestion information is light.   The root canal former according to any one of claims 1 to 10, wherein the suggestion information is sound and light.   The root canal former according to any one of claims 1 to 13, wherein the operation of the surgeon urged by the suggestion information is an operation of changing a position of the cutting tool held by the handpiece.   The root canal former according to claim 14, wherein the operation of changing the position of the cutting tool is a vertical movement operation of pulling up the cutting tool back to the crown side.

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