JPH0541513U - Ultrasonic therapy device with root canal length measurement function - Google Patents

Abstract

(57) [Summary] [Purpose] To make it possible to easily eliminate the bite of the treatment tool during automatic stop. [Structure] When the treatment tool 2 is detected to be in a restrained state when the ultrasonic output is stopped or powered down by the auto-stop function, the auto-stop is released for a certain period of time. [Effect] The conventional cumbersome operation of re-outputting ultrasonic waves by operating the foot switch after canceling the automatic stop with a manual switch is not necessary, and the operation when the therapeutic tool bites becomes easy.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to improvement of a dental ultrasonic treatment device having a root canal length measuring function.

[0002]

[Prior Art]

 In dental treatment, devices that expand root canals and clean root canals by vibrating ultrasonically the treatment tools such as files and reamers are widely used, but they are more efficient than the manual type, so be careful when using them. If this is not done, the root canal stenosis may be enlarged too much or accidents such as so-called perforations may occur. Therefore, while expanding and cleaning the root canal, at the same time the position of the tip of the treatment tool in the root canal is detected and displayed, or the ultrasonic wave is controlled according to the position of the tip of the treatment tool. An ultrasonic therapeutic device with a root canal length measuring function is known.As an example of the above ultrasonic control, the ultrasonic output is automatically stopped or the power down is performed when the tip of the therapeutic tool reaches a predetermined set position. There is control to do. In the following description, stopping or powering down the ultrasonic wave in this way is collectively referred to as “auto stop”.

However, in such a device having an automatic stop function, the treatment tool may not come off due to vibration stop or power down. That is, when the auto-stop position is set, for example, in the root canal stenosis to expand or clean the root canal, ultrasonic waves stop or power down with the tip of the treatment tool inserted in the root canal stenosis. Therefore, if the treatment tool is pushed into the narrow root canal stenosis or the contents of the root canal stenosis are hard, the treatment tool remains eroded. Such a situation is particularly likely to occur in the case of a curved root canal, and the operator operates a manual switch provided on the operation panel or the like each time to release the auto stop, and then further presses the foot switch. It is necessary to re-output the ultrasonic wave by operating it or power up to pull out the treatment tool, which is not only troublesome to operate, but also contributes to lowering medical treatment efficiency.

[0004]

[Problems to be solved by the device]

 The present invention focused on these problems, and its object was to make it possible to easily eliminate the bite of the treatment tool at the time of automatic stop.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, in the first invention, in the ultrasonic treatment device with a root canal length measuring function, the constraint state detecting means for detecting the constraint state of the treatment tool and the tip of the treatment tool are set to a predetermined setting. When the position is reached and the ultrasonic output is stopped or powered down, it is detected that the medical treatment tool is in a restrained state, and the releasing means releases the auto stop operation for at least a fixed time. In the second invention, the operating state of the foot switch is detected when the tip of the treatment tool reaches a predetermined set position and the ultrasonic output is stopped or powered down, and when the predetermined foot switch is operated. A release means is provided for releasing the auto stop operation for at least a fixed time.

[0006]

[Action]

 In the first aspect, when the tip of the treatment tool reaches a predetermined set position and is automatically stopped, the ultrasonic wave is automatically re-output or powered up if the treatment tool is in a restrained state due to bite. Therefore, it is possible to pull out the treatment tool. It should be noted that the treatment tool being in the restrained state can be detected because the vibration system is in the same state as when a heavy object is added to the vibration end. Specifically, changes in the resonance frequency, a decrease in dynamic impedance at the resonance frequency, fluctuations in the phase angle of the current and voltage, etc. occur, so these fluctuations are detected by the restraint state detection means and the magnitude of the fluctuations is detected. Whether or not the value exceeds the clinically confirmed standard value. Further, in the second invention, the ultrasonic switch is re-outputted or powered up by operating the foot switch in a predetermined pattern in a state where the tip of the treatment tool reaches a predetermined set position and is automatically stopped. It can be pulled out.

[0007]

EXAMPLES Hereinafter, the illustrated examples will be described. FIG. 1 is a block diagram of an ultrasonic treatment device with a root canal length measuring function of the first invention, 1 is a handpiece, 2 is a file attached to the handpiece 1 through a tip 1a, and 3 is a handpiece Reference numeral 1 is an ultrasonic transducer built in 1, 4 is a transducer driver, 5 is a changeover switch, 6 is a switch operating circuit, 7 is an impedance measuring circuit, and 8 is a controller. The transducer driver 4 is controlled by the controller 8 and drives the ultrasonic transducer 3 to vibrate the file 2 when the switching switch 5 is switched as shown by the solid line in the figure. The impedance measuring circuit 7 is provided as a restraint state detecting means in the present invention, and may be appropriately configured so as to measure the dynamic impedance of the vibration system including the ultrasonic transducer 3, and is disclosed in, for example, Japanese Unexamined Patent Publication No. Hei 2 A circuit configuration as disclosed in Japanese Patent No. 144052 is possible.

Reference numeral 11 is a root canal length measuring circuit, 12 is a display unit, 13 is an auto stop setting unit, 14 is an operating unit, and 15 is a foot switch. The device for electrically measuring the root canal length is one that detects the resistance value between the measurement electrode inserted into the root canal and the oral electrode connected to the soft tissue in the mouth, or between both electrodes. There are methods for detecting the impedance of the root canal length measuring circuit 11, but the root canal length measuring circuit 11 is configured by appropriately adopting these methods, and the measurement results are sequentially displayed on the display unit 12. .. The auto-stop setting unit 13 sets an auto-stop position at which the ultrasonic output is stopped or the power is lowered when the tip of the file 2 reaches in the root canal. Various settings are made such as adjusting the output value, controlling the wash water, and selecting the control mode to determine whether or not the automatic stop of the automatic stop should be performed. The display unit 12, the automatic stop setting unit 13, and the operation unit 14 are respectively configured. It is properly installed in a location that is easy to see and operate, such as the operation panel of the equipment.

FIG. 3 is an explanatory view of the control mode. The mode is the same control mode as the conventional device that does not cancel the auto stop, and the mode is the control mode that cancels the auto stop according to the present invention. The controller 8 controls the operation of each circuit according to the setting contents by the setting unit 13 and the operation unit 14 and the selected control mode. For example, a predetermined control as described below is performed by using a microcomputer. The controller 8 is programmed to operate, but it is also possible to configure the controller 8 using a general discrete circuit without using a microcomputer.

This embodiment is configured as described above and operates as follows. First, the operator selects a desired control mode with the operation unit 14, and if the mode is selected, the setting unit 13 sets the auto stop position to a level determined by clinical experience, and then the foot switch 15 is turned on. The ultrasonic transducer 3 is operated to start driving, and the root canal is enlarged and cleaned. At this time, the changeover switch 5 is changed over as shown by the solid line in FIG. 1, and as shown by A in FIG. 3, the ultrasonic transducer 3 is driven and stopped depending on whether the foot switch 15 is turned on or off. In addition, when the root canal length measuring circuit 11 detects that the tip of the file 2 has reached the auto-stop position at the time t ₀ while the ultrasonic transducer 3 is in a driving state, the switch operating circuit 6 operates to switch. The switch 5 is switched to the broken line side. As a result, the ultrasonic transducer 3 is stopped and connected to the impedance measuring circuit 7, and the detected dynamic impedance is compared with a preset reference value to determine whether the tip of the file 2 is restricted. To be judged.

In the above judgment, when the file 2 is not restrained, the operation of the vibrator driver 4 is stopped, but when it is judged that the file 2 is restrained, the changeover switch 5 is again turned to the solid line in FIG. After switching to the position, as shown by B in FIG. 3, the vibrator driver 4 is continuously operated for about 0.5 seconds, for example. The file 2 is released from the restrained state by this re-vibration, so that the operator can pass through the file 2 during this period, and then the switching switch 5 is switched to the broken line side again to confirm the restrained state. As described above, in this embodiment, when the foot switch 15 is turned on during the automatic stop and the file 2 is in the restrained state, the ultrasonic transducer 3 is re-driven for a short time and the root canal wall, etc. It is possible to remove File 2 that has cut into.

The re-output period T of the ultrasonic wave after the release of the auto stop is not only automatically limited to a short time such as 0.5 seconds described above, but this period can be changed as necessary. Alternatively, as shown by the broken line in FIG. 3, re-outputting may be continued until the foot switch 15 is turned off, or another control pattern may be adopted. When the mode is selected, the ultrasonic transducer 3 is driven and stopped according to the on / off state of the foot switch 15 as shown in FIG. 3, and after stopping at the auto stop position, the foot switch 15 remains on. Even if they do, they will remain stopped.

Next, an embodiment of the second invention shown in FIG. 2 will be described. As shown in the block diagram of FIG. 2, this embodiment has a configuration in which the changeover switch 5, the switch operating circuit 6, and the impedance measuring circuit 7 are removed from FIG. 1, and the control mode is the mode of FIG. When the mode is set and the mode is selected, the auto stop can be released by operating the foot switch 15. That is, the drive and the stop of the ultrasonic transducer 3 are performed according to the on / off of the foot switch 15 as in the normal device except when the auto stop is performed, but the foot switch 15 is once turned off and then turned on again at the auto stop. As a result, this operation is performed and the auto stop is released when the power is turned on again, and the ultrasonic transducer 3 is re-driven as shown in C of FIG.

Therefore, the operator only needs to pass through the file 2 during this re-driving, and since the leading end of the file 2 moves from the auto-stop position, the release of the auto-stop is continued and the normal driving state is restored. In this way, when the ultrasonic wave is stopped by the auto stop function, the ultrasonic wave is re-output by operating the foot switch in a pre-set operation sequence, so there is no need to provide an impedance measurement circuit. It is possible to remove the file 2 that has been bitten by turning off the auto stop. In order to prevent malfunction, the foot switch operation pattern for canceling the auto stop may be more complicated than the simple on / off described above.

In each of the above-mentioned embodiments, when the automatic stop is released and the ultrasonic wave is re-outputted, the ultrasonic wave may be re-outputted with the same power as before, but the output is reduced to damage the root canal stenosis. It is desirable to re-output with power that is not given. Further, in the above description, the case where the ultrasonic wave is turned on and off is described, but it is also possible to employ a control for powering down the ultrasonic wave during auto stop. The magnitude of the power for these re-outputs, whether to stop or power down the ultrasonic waves, and whether the above-mentioned re-output period is fixed or variable may be set at the time of manufacturing the device. It is also possible to provide the operation unit 14 with means for selecting these so that the operator can select them. Since the function of canceling the auto stop in the embodiment of FIG. 2 can be realized by recognizing the operation of the foot switch by the controller 8, it is easy to add this function to the embodiment of FIG.

[0016]

[Effect of the device]

 As is clear from the above description, the first invention is to release the automatic stop for at least a fixed time when the treatment tool is detected to be in the restrained state when the ultrasonic output is stopped or powered down by the automatic stop function. I decided to do so. Therefore, if the treatment tool is restrained by biting into the root canal wall, etc., operate the manual switch as in the past to release the auto stop, and then operate the foot switch to restart the ultrasonic wave. The troublesome operation of outputting the data is not necessary, and the operation is easy and the medical examination can be performed efficiently.

A second invention is to release the automatic stop for a fixed time by operating the foot switch in a predetermined pattern when the ultrasonic output is stopped by the automatic stop function. Therefore, it is possible to perform the automatic stop release for pulling out the bitten treatment tool with a relatively simple circuit configuration.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a block diagram of another embodiment of the present invention.

FIG. 3 is a timing chart illustrating a control mode in the embodiment.

[Explanation of symbols]

 2 File 3 Ultrasonic transducer 5 Changeover switch 7 Impedance measurement circuit 8 Controller 11 Root canal length measurement circuit 13 Auto stop setting section 15 Foot switch

Claims (2)

[Scope of utility model registration request] 1. A root which has a root canal length measuring function and is configured to automatically stop or power down ultrasonic output when the tip of a therapeutic tool also serving as a measuring electrode reaches a predetermined set position. An ultrasonic therapeutic device with a pipe length measuring function,
Constraint state detecting means for detecting a constraint state of the treatment tool, and at least when it is detected that the treatment tool is in the constraint state when the tip of the treatment tool reaches a predetermined set position and ultrasonic output is stopped or powered down. An ultrasonic therapeutic device with a root canal length measuring function, comprising: a releasing means for releasing ultrasonic power output or releasing power down for a predetermined time. 2. A root having a root canal length measuring function and configured to automatically stop or power down the ultrasonic output when the tip of the treatment tool which also serves as a measuring electrode reaches a predetermined set position. An ultrasonic therapeutic device with a pipe length measuring function,
The operating state of the foot switch is detected when the tip of the treatment tool reaches the specified position and the ultrasonic output is stopped or powered down, and when the specified foot switch operation is performed, the ultrasonic wave is generated for at least a certain time. An ultrasonic therapeutic device with a root canal length measuring function, which is provided with a releasing means for releasing output or releasing power down.