JPH0346743Y2 - - Google Patents

Description

[Detailed description of the invention] "Field of industrial application" This invention relates to a contamination prevention device for a dental handpiece used in dental treatment, and in particular, the device is designed to prevent internal contamination by increasing the internal pressure of the head tip. This invention relates to pollution prevention equipment.

``Prior art and its problems'' In general, dental handpieces have a cutting tool attached to the rotary shaft of an air turbine that protrudes from the bottom of the head tip.The cutting tool is applied to the affected area in the mouth, and compressed air is used to generate the air turbine. The cutting tool is rotated to treat the affected area using a cutting tool.

By the way, when performing dental treatment using such a dental handpiece, the handpiece is inserted into the mouth, so sufficient consideration must be given to in-hospital infections from the handpiece.

Therefore, in the past, alcohol disinfection,
Methods such as sterilization and disinfection methods are used to disinfect handpieces, but the headtip that makes up the handpiece has a complex internal structure, so disinfecting it is troublesome, so it is necessary to reliably prevent contamination inside the headtip. It is required to have a structure that allows

``Means for Solving the Problems'' The present invention is to attach a cutting tool to the rotary shaft of an air turbine built into a head tip provided at the tip of the handpiece body, and to attach the cutting tool to the tip of the handpiece body toward the inside of the mouth. A nozzle tube that injects water into the mouth, and an injection tube that injects compressed air into the mouth are arranged coaxially with the nozzle tube inserted inside the injection tube, and the cutting tool is applied to the affected area in the mouth. In a dental handpiece that uses compressed air to rotate an air turbine to treat an affected area with a cutting tool, the internal pressure of the head tip is increased inside the handpiece body, and the pressure is injected to the outside from the injection pipe. The head tip is formed by screwing together an upper lid and a lower lid that cover the upper and lower openings of the casing above and below the casing, and furthermore, the upper lid has an outer circumferential surface. An annular groove communicating with the upper branch passage of the second supply passage is formed, and a through hole through which the rotating shaft of the air turbine passes through is provided in the center of the upper cover, and the air turbine is connected to the inner circumferential surface of the through hole. A circumferential groove forming an air pocket is formed at a position facing the rotating shaft, and a communication passage communicating with these grooves is provided between the circumferential groove and the annular groove, and furthermore, between the lower cover and the casing. An annular groove communicating with the lower branch pipe of the second supply passage is formed, and a through hole passing through the rotating shaft of the air turbine is formed in the center of the lower cover, and the air at the inner circumferential surface of the through hole is formed. A circumferential groove forming an air pocket is provided at a position facing the rotating shaft of the turbine, and a communication path is provided between the circumferential groove and the annular groove to communicate them.

"Operation" According to the contamination prevention device configured as described above, the internal pressure of the head chip is increased by the compressed air sent to the through hole, thereby reliably preventing contamination from the through hole through which the rotating shaft penetrates to the outside. Moreover, since the circumferential groove on the inner periphery of the through hole constitutes an air pocket, the film thickness of the air in this part becomes thicker, and it is possible to reliably prevent impurities and the like from being sucked in around the head chip.

``Embodiment'' Hereinafter, an embodiment of the present invention will be described with reference to FIG. A cylindrical head tip 3 containing an air turbine 2 is provided at the tip, and inside the handpiece body 1 there is a first supply passage 4 for supplying compressed air for the air turbine, and a first supply passage 4 for supplying compressed air for the air turbine. A second supply passage 5 for supplying compressed air and a water supply passage 6 for water are respectively formed. A nozzle pipe 7 for injecting water to the outside is disposed at the tip of the water supply passage 6, and an injection pipe 8 for ejecting compressed air is inserted into the outer periphery of the tip of the nozzle pipe 7.
A cutout hole 9 communicating with the second supply passage 5 is formed in the opening.

To explain the details of the head tip 3, this has a cylindrical casing 10 and an upper lid 11 and a lower lid 12 that cover the upper and lower openings of the casing 10, which are screwed together on the upper and lower sides of the casing 10. The air turbine 2 is rotatably supported by a pair of upper and lower bearings (ball bearings) 13 and 14. The air turbine 2 has a rotating shaft 15 on which a cutting tool (hereinafter referred to as a drill) such as a diamond point is attached, and the end of the cutting tool is attached to the lower cover 1.
It stands out from 2.

The upper lid 11 is formed with an annular groove 16 that communicates with the upper branch passage 5a of the second compressed air supply passage 5, and is also provided with a through hole 17 through which the rotating shaft 15 of the air turbine 2 passes. The inner peripheral surface of this through hole 17 has a circumferential groove 1 that forms an air pocket.
8 is formed, and a communication path 19 is formed between this circumferential groove 18 and the annular groove 16 and communicates with these grooves.
is provided.

An annular groove 20 is formed between the lower lid 12 and the casing 10, which communicates with the lower branch pipe 5b of the second supply passage 5. Further, a through hole 21 is formed in the lower lid 12 and passes through the rotating shaft 15 of the air turbine 2, and a circumferential groove 22 for forming an air pocket is provided on the inner peripheral surface of the through hole 21. . This circumferential groove 22 and the annular groove 2
0, a communication path 23 is provided to communicate these.

The supply means for supplying compressed air to the second supply passage 5 is provided with a control means for supplying compressed air even after the air turbine 2 is stopped, so that the internal pressure of the head chip 3 is maintained even after the air turbine 2 is stopped. By increasing this, it is possible to reliably prevent surrounding impurities from entering the interior of the head tip 3 from the through holes 17, 21 and the pipes 7, 8 of the spray portion.

Further, reference numeral 25 in the figure indicates an O-ring provided on the outer periphery of the outer periphery 13, 14 of the bearing of the air turbine 2;
Reference numeral 26 indicates gaskets disposed above and below the bearings 13 and 14.

Next, the operation of this embodiment configured as above will be explained.

To treat the affected area in the mouth with the dental handpiece configured as described above, compressed air is sent to the second supply passage 5, compressed air is sent to the first supply passage 4 to operate the air turbine 2, and the nozzle is While jetting water from the tube 7, a cutting tool such as a drill needle is applied to the affected area in the mouth.

When compressed air is sent to the second supply passage 5, a part of this compressed air is injected from the tip of the injection pipe 8 through the notch hole 9 of the injection pipe 8, and is mixed with the water in the nozzle pipe 7 to form a spray state. form. On the other hand, the compressed air that has passed through the branch pipes 5a and 5b above and below the second supply passage 5 passes from the annular grooves 16 and 20 through the communication passages 19 and 23, and then passes through the circumferential groove 18 on the inner peripheral surface of the through holes 17 and 21. 22
In addition to increasing the internal pressure of the head chip 3, air pockets are formed in the through holes 17 and 21 to thicken the air film in the part where the rotating shaft 15 of the air turbine 2 passes through. The suction of impurities is reliably prevented,
Contamination within the head chip 3 can be reliably prevented. Furthermore, by blowing compressed air onto this rotating shaft 15, there is an advantage that the durability of this portion can be improved.

Moreover, the compressed air sent to the second supply passage 5 is
Needless to say, since the air is supplied even after the air turbine 2 has stopped operating, the internal pressure of the head tip 3 will not drop, and contamination from inside the mouth can be reliably prevented. In the embodiment described above, even after water spraying from the nozzle pipe 7 has stopped, compressed air is sent from the tip of the injection pipe 8 through the second supply passage 5, so that the nozzle pipe 7 can be reliably drained. Moreover, since a so-called air curtain is formed at the tip of the nozzle pipe 7, there is an advantage that impurities, water droplets, etc. can be prevented from entering from this part.

FIG. 2 shows another embodiment of the present invention, in which the communication passage 23 of the lower lid 12 is formed in a downwardly inclined state, thereby directing the compressed air passing through the communication passage 23 downward. The structure is such that it is sprayed towards the target.

In this embodiment, since the compressed air passing through the communication path 23 is injected toward the outside of the through hole 21, the effect of preventing contamination in this area can be further improved.

"Effects of the Invention" As explained above, the present invention provides the following excellent effects.

(a) A dental device that can spray water from a nozzle tube at the tip of the handpiece body and also spray compressed air from the spray tube, mixing the water in the nozzle tube and the compressed air in the spray tube to form a spray state. In particular, it is possible to provide a suitable contamination prevention device for a handpiece, which utilizes compressed air injected from an injection pipe, sends this compressed air into the head tip to increase the internal pressure in the head tip, and blows the top cover from the annular groove. By passing through the communicating passages of the lower cover and into the circumferential groove on the inner circumferential surface of the through hole, compressed air forms an air pocket in each of the through holes of the upper cover and the lower cover, and the rotation axis of the air turbine is Since the air film at the penetrating portion of the head chip is thickened, it is possible to reliably prevent impurities from being blown in from around the head chip, thereby reliably preventing contamination within the head chip. Furthermore, even after the spraying of water from the nozzle pipe has stopped, compressed air is sent from the tip of the injection pipe through the second supply passage, making it possible to ensure that water is drained from the nozzle pipe. Since an air curtain is formed by the compressed air from the injection tube at the tip of the nozzle tube, there is also the effect that it is possible to prevent impurities, water droplets, etc. from entering from this part.

Moreover, in the present invention, the circumferential groove is formed in the through-holes of the upper and lower covers that cover the upper and lower openings of the head tip, and the circumferential groove that forms the air pocket for compressed air is formed at the position of the through-hole. Since the air film in this area is thickened, it is possible to effectively prevent contamination from near the boundary between the inside and outside of the head chip.

(b) Since the circumferential grooves are formed in the upper and lower covers that are removable from the head tip, cleaning of the circumferential grooves and the like can be carried out by removing the upper and lower covers from the head tip, thereby reducing maintenance. There are some effects that can be made easier.

(c) Through the above, it is possible to effectively prevent nosocomial infections.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the present invention;
The figure is a sectional view of essential parts showing another embodiment of the present invention. 1...Handpiece body, 2...Air turbine, 3...Head tip, 4...First supply passage,
5... Second supply passage, 6... Water supply passage, 7... Nozzle pipe, 8... Injection pipe, 10... Casing, 1
1... Upper cover, 12... Lower cover, 13, 14... Bearing, 15... Rotating shaft, 16, 20... Annular groove, 1
7, 21... Through hole, 18, 22... Circumferential groove, 1
9, 23...Communication hole.

Claims (1)

[Claims for Utility Model Registration] A cutting tool is attached to the rotating shaft of an air turbine built into a head tip provided at the tip of the handpiece body, and a nozzle that sprays water toward the inside of the mouth at the tip of the handpiece body. A tube and an injection tube that injects compressed air into the mouth are arranged coaxially with the nozzle tube inserted inside the injection tube, and the cutting tool is applied to the affected area in the mouth, and the compressed air is used to inject the air into the mouth. In a dental handpiece that rotates a turbine to treat an affected area with a cutting tool, the handpiece main body has compressed air inside the handpiece body to increase the internal pressure of the head tip and to inject compressed air to the outside from the injection pipe. A second supply passage for feeding is formed, and the head tip is formed by screwing together an upper cover and a lower cover covering the upper and lower openings of the casing on the upper and lower sides of the casing. An annular groove communicating with the upper branch passage is formed, and a through hole through which the rotating shaft of the air turbine passes through is provided in the center of the upper cover, and a through hole through which the rotating shaft of the air turbine passes through the inner peripheral surface of the through hole. A circumferential groove forming an air pocket is formed at the facing position, and a communication passage communicating with these grooves is provided between the circumferential groove and the annular groove, and furthermore, the lower cover and the casing are connected to each other. An annular groove communicating with the lower branch pipe of the second supply passage is formed between the lower cover and a through hole passing through the rotating shaft of the air turbine in the center of the lower cover. A circumferential groove forming an air pocket is provided at a position facing the rotating shaft of the air turbine on the inner circumferential surface of the air turbine, and a communication path is provided between the circumferential groove and the annular groove to communicate them. A dental handpiece contamination prevention device featuring: