JP2021090718A - Reciprocating motion generator for file, and reciprocating motion generator with file - Google Patents

Abstract

To provide a reciprocating motion generator for a dental file which can quickly apply a stronger force in a forward motion than in a reverse motion by improving driving means of a vibration cylinder housing a file in a configuration where the file is inserted from a rear side and the file is projected from a front side.SOLUTION: A reciprocating motion generator 1 is composed of a handle side housing 10 and a vibration side housing 11 at a tip end side of the handle side housing, and a vibration cylinder 13 is installed in the vibration side housing 11. Around a side face of the vibration cylinder 13 in which a file 3 can be inserted, there is provided, in a range of 90 degrees, a cam groove comprising a chevron-shaped cam groove upper edge part 14 and a flat cam lower edge part 15. At a tip end of a rotation shaft 20 connected to a rotation shaft of an electric motor of a chair unit, there is attached an oval cam 21 comprising a thinner side and a thicker side so that the rotation shaft 20 is positioned at the thicker side. The oval cam 21 engages with the cam groove so as to allow the vibration cylinder 13 to make the reciprocating motion.SELECTED DRAWING: Figure 1

Description

The present invention relates to a reciprocating motion generator for electrically generating a reciprocating motion to drive a file and cleanly treating a portion of the file that has tooth decay. The file referred to in the present invention is a term including a reamer for reaming and a file for filing, but the present invention includes a therapeutic device similar to these.

A root canal where a dentist scrapes the wall of the root of a patient's cavities, removes a lump of pus stuck at the tip of the root, a filler that is a trace of previous treatment, and denervates. It is common to use a handpiece called a file when performing treatments such as. This includes reamers and files as described above, with reamers named after reaming and files named after filing. These are color-coded on the pattern or have symbols and numbers written on them depending on the purpose and size. A root canal length measuring device is often used in combination with such root canal treatment.

The article on the following internet site is easy to understand about the above-mentioned dental nerve treatment method.

The inventor can reduce the fatigue of the dentist and maintain his concentration by making it easier to enlarge and clean the root canal of the tooth and denervate using the file. In order to provide such a dental tool, the inventions of International Publication WO 2019/022255 and Japanese Patent Application Laid-Open No. 2019-150569 have been disclosed. These have made significant progress, including: Since the file is reciprocated by driving a motor etc. using a cam, the force technique of sending the reamer to the apex of the root canal with just a finger is no longer necessary, and the dentist can use the needle-shaped part of this file. All you have to do is to address the tip of the root canal to the part you want to treat, and the procedure is not overwhelming, and you can work with less fatigue and maintain your concentration.

International release WO 2019/022255 JP-A-2019-150569 Internet WWW site <URL: http: // mustiba-labo. com /? p = 10133>

In developing such a therapeutic device, the present inventor considered that it would be convenient if it could be used while exchanging commercially available files. At this time, if the file is inserted from the rear side and the needle-shaped part is exposed from the front side, the dentist attaches or detaches the support shaft of the file from the front side in a manner of looking into the needle-shaped part of the file. I found that I didn't have to do it and I felt less psychological resistance. However, in order to realize this, neither in the international publication WO 2019/022255 nor in Japanese Patent Application Laid-Open No. 2019-150569, it becomes impossible to dispose the cam on the rear side of the file as in the first embodiment. As in the fifth embodiment, a pin hole is provided on the side surface of the vibrating cylinder for storing the file, and a pin provided eccentrically is engaged with the tip of the rotating shaft connected to a drive source such as a motor of the chair unit. By doing so, the reciprocating motion generating part was formed.

This gave us a better configuration for attaching and detaching files, but when using files for filing in the true sense of the word, the following new problems arise between pins and pin holes. It was. Since the pin is provided in an eccentric state on the rotating shaft connected to the drive source, the reciprocating forward and backward movements have the same force on the side of the pin hole that engages with the pin, that is, on the side of the vibrating cylinder that houses the file. It is done in the cycle of. However, in the filing in the international publication WO 2019/022255 and Japanese Patent Application Laid-Open No. 2019-150569, it may be said that the efficiency of the forward movement and the return movement is improved by applying a quick and strong force to the forward movement.

Therefore, in the present invention, in the configuration in which the file is inserted from the rear side and the needle-shaped portion is pulled out from the front side, the driving means of the vibrating cylinder that stores the file can be improved to apply a stronger force more quickly to the forward movement. The challenge is to be able to do it.

The above-mentioned problem comprises a housing, a reciprocating movement generating portion housed in the housing, a vibrating cylinder provided in the reciprocating movement generating portion, and a file attachment / detachment portion provided in the vibrating cylinder. The reciprocating movement generating portion is configured by engaging a cam provided eccentrically at the tip end portion of the connected rotating shaft with a cam groove provided on the side surface portion of the vibrating cylinder, and the detachable portion. Is configured to insert the file from the rear side and pull out the needle-shaped portion of the file from the front side, and is provided with a fixing means for stopping the inserted file at the rear portion of the attachment / detachment portion. Has a substantially chicken egg shape, and the rotation axis is provided so as to be eccentric to the thick side of the substantially chicken egg shape, and the cam groove has a chevron-shaped cam groove upper edge portion and a flat cam groove lower edge portion. This is achieved by using a file reciprocating generator consisting of.

Since a cam groove is provided around the side surface of the vibrating cylinder and a cam having a substantially chicken egg shape is engaged in the cam groove, the reciprocating movement of the vibrating cylinder largely depends on the outer peripheral shape of the cam. That is, the cam groove is composed of a chevron upper edge portion of the cam groove and a flat cam groove lower edge portion.

This reciprocating device is held by the dentist and the force is applied in the direction of the teeth very naturally rather than strongly. Therefore, the egg-shaped cam pushes the lower edge of the flat cam groove more strongly on the side where the needle-shaped part of the file of the cam groove is located, while the opposite side becomes the upper edge of the chevron cam groove. By doing so, it acts to release the pressure of the cam having a substantially chicken egg shape. That is, the phenomenon of pushing the lower edge of the flat cam groove more strongly occurs when the tip of the needle-shaped part of the file enters the root canal, and this result is faster and stronger in the forward movement in the reciprocating movement. It means that you can apply force.

Now, in root canal treatment, in order to send the needle-shaped part of the file to the apex of the root canal, the file is designed so that it can be reciprocated at any distance within the width of 0.5 mm to 2.0 mm. The inventor was able to find out that it is preferable to do so. This is actually the same distance range as in the case of grasping the hand file with a fingertip and manually moving it up and down finely. At this time, the tip of the needle-shaped part of the file strongly penetrates into the root canal.

The speed of the reciprocating motion generated by the reciprocating motion generating unit can also be changed by controlling the electric motor. Then, for example, it becomes possible to perform a treatment that adjusts the reciprocating movement of the reamer according to the degree of bending of the root canal, which varies from person to person. More specifically, the reamer is slowly reciprocated in places where the degree of bending is large.

Next, the fixing means may be a screw cap for the attachment / detachment portion. The screw type cap is easy to use, and it is possible to securely fix the cap in the reciprocating movement, and the file is exchanged by attaching and detaching this screw type cap. Although there is no response at the beginning of tightening or loosening the screw cap, it is actually possible to tighten or loosen the cam from the time when the egg-shaped cam comes into contact with the wall in the circumferential direction of the cam groove. The fixing means may be a push-in cap for the detachable portion.

Next, in the reciprocating motion generator of the file according to claim 1, the cam provided on the rotating shaft can be attached to and detached from the rotating shaft. The shape of the cam is roughly the shape of a chicken egg, but prepare several cams with slightly different sizes and shapes, and replace them with ones that suit the dentist's preference or root canal treatment for each patient. It becomes possible to do so.

By the way, in the reciprocating movement generator of the file according to claim 1, it is possible to assume that the file is composed of a needle-shaped portion and a support shaft and includes a dental file in which the needle-shaped portion flexibly bends. .. That is, the reciprocating motion generator as described above is provided with a file in which the needle-shaped portion flexibly bends.

According to the present invention, a cam having a substantially chicken egg shape is engaged with a cam groove provided around the side surface of the vibrating cylinder to which the file is mounted, so that a force is naturally applied to the reciprocating generator in the direction of the teeth. The rotating cam will push the lower edge of the flat cam groove more strongly on the side with the needle-shaped part of the cam groove file, while the opposite side will be the upper edge of the chevron cam groove. By being, it became possible to release the pressure of the cam in the shape of a roughly chicken egg. As a result, it is possible to apply a stronger force more quickly to the forward movement in the reciprocating movement.

It is explanatory drawing which cutout and represented a part of Example 1. FIG. It is explanatory drawing of the engagement state of an egg-shaped cam 21 and a cam groove 16. It is explanatory drawing of the operation state represented by (A) and (B). It is explanatory drawing of the operation state of the file 3.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings, but the present invention is not limited to this. The file 3 referred to in the following embodiment is composed of an insertion portion 30 (a knob portion) and a needle-shaped portion 31, and the needle-shaped portion 31 flexibly bends (FIG. 4: F). It is a file for filing based on the above definition, but it can also be designed to use a reamer for reaming or a cutting tool similar to these.

The reciprocating motion generator 1 will be described with reference to FIGS. 1 to 4. The reciprocating movement generator 1 includes a handle-side housing 10 and a vibration-side housing 11 at the tip thereof. A vibrating cylinder mounting port 12 is opened at the tip of the vibrating side housing 11, and the vibrating cylinder 13 is mounted there. The vibrating cylinder 13 is inside the vibrating side housing 11 and is provided so as to be vibrable in the front-rear direction (vertical direction in FIG. 1). Further, a file mounting port 18 is opened at the rear end of the vibrating cylinder 13, and when the file 3 is mounted from here, the needle-shaped portion 31 comes out of the needle through hole 17 of the vibrating cylinder 13 and is inserted. It is configured so that the tip portion of the 30 can be pushed in until it comes into contact with the inside of the needle through hole 17. The file 3 can be fixed by screwing the screw cap 19 into the file mounting port 18. Therefore, the file 3 is exchanged by attaching and detaching the screw cap 19. This file 3 is composed of an insertion portion 30 (a knob portion) and a needle-shaped portion 31, and the needle-shaped portion 31 flexibly bends. As the file 3, a commercially available hand file can be used in this embodiment.

Further, the reciprocating movement generator 1 is configured to be connected to a rotation shaft of an electric motor of a chair unit (not shown) and to be rotationally driven. A rotating shaft 20 is provided at the tip of the transmission shaft 2 connected to the rotating shaft of the electric motor, and an oval cam 21 composed of a thin side 22 and a thick side 23 is provided at the tip of the rotating shaft 20. It is attached so as to be eccentric (the rotating shaft 20 is located) on the thick side 23. As shown in FIG. 2, the egg-shaped cam 21 is engaged with a cam groove 16 provided in a range of 90 degrees around the side surface portion of the vibrating cylinder 13.

The cam groove 16 is composed of a chevron upper edge portion 14 of the cam groove and a flat cam groove lower edge portion 15. The half circumference of the rotating oval cam 21 pushes the lower edge portion 15 of the cam groove toward the needle-shaped portion 31 of the file 3 so as to strongly hit the lower edge portion 15 of the flat cam groove (FIG. 3 (A)). The remaining half circumference tries to push the chevron cam groove upper edge portion 14, but since the chevron cam groove upper edge portion 14 has a chevron shape, it acts to release the pressure of the oval cam 21.

When the electric motor of the chair unit is turned on, the egg-shaped cam 21 starts rotating via the transmission shaft 2. The vibrating cylinder 13 in which the force is applied in the direction of the teeth naturally rather than strongly by the dentist's hand is the one in which the narrow side 22 of the oval cam 21 has the needle-shaped portion 31 of the file 3 of the cam groove 14. The side side, that is, the flat cam groove lower edge portion 15, is pushed more continuously and strongly on the thick side 23 and on the thinner side 22. This phenomenon occurs when the tip of the needle-shaped portion 31 of the file 3 enters the root canal, and it can be said that a stronger force (FIG. 4: S) can be applied more quickly to the inward movement of the reciprocating movement. Become.

Regarding the engagement between the cam groove 14 of the vibrating cylinder 13 and the oval cam 21, it is eager to set the reciprocating distance of the needle-shaped portion 31 within a width of 0.5 mm to 2.0 mm. As a result of the research, the inventor was able to find out. This was actually the same distance range as in the case of grasping the hand file with a fingertip and manually moving it up and down finely.

Although not shown, the egg-shaped cam 21 may be detachable from the rotating shaft 20. If the cam shape is a substantially chicken egg shape like the oval cam 21, prepare several cams with slightly different sizes and shapes, and suit the root canal treatment according to the dentist's preference or for each patient. You will be able to exchange it for something and use it.

This invention has made it possible to reduce the burden on dentists and improve treatment techniques, thereby contributing to the development of industry. The present invention is not limited to the above-described examples. For example, the outer peripheral portion of the egg-shaped cam 21 may be covered with a cover.

1: Reciprocating movement generator 10: Handle side housing 11: Vibration side housing 12: Vibration cylinder mounting port 13: Vibration cylinder 14: Cam groove upper edge 15: Cam groove lower edge 16: Cam groove 17: Needle through hole 18: File mounting port 19: Screw cap 2: Transmission shaft 20: Rotating shaft 21: Oval cam 22: Thin side 23: Thick side 3: File 30: Insertion part 31: Needle-shaped part

Claims (4)

It consists of a housing, a reciprocating movement generator housed in the housing, a vibrating cylinder provided in the reciprocating movement generating part, and a file attachment / detachment part provided in the vibrating cylinder, and is connected to a motor. The reciprocating movement generating portion is configured by engaging the cam provided eccentrically at the tip end portion of the shaft with the cam groove provided on the side surface portion of the vibrating cylinder, and the detachable portion rearlies the file. It is configured to be inserted from the side and the needle-shaped part of the file is pulled out from the front side, and a fixing means for stopping the inserted file is provided at the rear part of the detachable part, and the cam has a substantially chicken egg shape. The rotation axis is provided so as to be eccentric to the thick side of the substantially chicken egg shape, and the cam groove is composed of a chevron cam groove upper edge portion and a flat cam groove lower edge portion. A featured reciprocating device for files. The file reciprocating generator according to claim 1, wherein the fixing means is a screw cap for the attachment / detachment portion. The file reciprocating motion generator according to claim 1, wherein the cam provided on the rotating shaft is detachable from the rotating shaft. The file reciprocating motion generator according to claim 1, wherein the file reciprocating motion generator comprises a needle-shaped portion and a support shaft, and includes a dental file in which the needle-shaped portion flexibly bends.

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