JPS6058655B2 - dental treatment instruments - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a joint member having a flexible supply hose connected to the rear end, and a treatment instrument main body having an air turbine head or an ejection nozzle at the tip of the handle. This invention relates to a dental treatment instrument that can be easily attached and detached, and that ensures free rotation of a flexible supply hose relative to the treatment instrument body, thereby facilitating the replacement of the treatment instrument body and ease of operability during dental treatment. .

In general, for dental treatment instruments, especially dental handpieces, a plurality of handpiece bodies are prepared in advance, each having a drill or the like of a predetermined shape attached to an air turbine head. Alternatively, it is used for dental treatment by being connected to a joint member provided at the tip of a flexible supply hose led out from the treatment chair side. Therefore, there is a need for a connection mechanism that allows the handpiece body to be replaced with the joint member easily and quickly. Therefore, the present application provides a dental treatment instrument that has a simple structure, allows for easy attachment and detachment of the treatment instrument body and the joint member, and also allows for free rotation of a flexible supply hose relative to the treatment instrument body. Hereinafter, an example of the dental handpiece shown in the drawings will be described in detail. This dental handpiece has an air turbine head at the tip of the handle.
It consists of a treatment instrument main body, that is, a handpiece main body A, and a joint member B, which has a flexible supply hose attached to its rear end. The handpiece body A has an air passage 2 for driving and an air passage 3 for generating mist inside the shaft cylinder 1 at the front.
and a water passage 4 for generating mist, and a fitting cylindrical body 6 having a fitting recess 5 communicating with each of the passages 2, 3, and 4 in the rear interior thereof. The rear end of this fitting cylinder 6 protrudes from the rear end of the shaft cylinder 1, and the fitting cylinder 6 is provided on its outer periphery.
A connecting tube 7 is provided concentrically with the connecting tube 7, and an annular groove 8 is formed around the rear outer circumference of the connecting tube 7. On the other hand, the joint member B is
A plurality of annular grooves 9 are formed on the outer periphery of the front part, and an O-ring 10 is fitted into the grooves 9 so that the front half is rotatably connected to the fitting recess 5 of the handpiece body A. 11 is formed to have a large diameter, and a fitting shaft 14 has a recess 12 and a protruding ring 13 having a larger diameter concentrically formed in the center of the rear end, and the outer periphery of the rear half of this fitting shaft 14. It has an inner diameter that is approximately equal to the outer diameter of the connecting tube 7 of the handpiece body A, and the inner circumference of the rear end portion is the outer circumference of the front half of the large diameter rear portion 11 of the fitting shaft body 14. an outer intubation tube 16 that is threadedly connected to a threaded portion 15 provided in the outer intubation tube 6; 14 and external intubation 1
6 and the connecting tube 7 of the handpiece body A.
a slide ring 18 having a diameter approximately equal to S and capable of sliding in the axial direction; and a shaft-shaped connection for rotatably connecting a flexible supply hose 19 to the rear end of the fitting shaft body 14. body 2
It is composed of 0. There is. The operation ring 17 and the slide ring 18 are always biased forward with elastic force by coil springs 21 and 22, respectively, and the outer tube 16
A plurality of through holes 23 are opened in the circumferential direction at the tip of the
This through hole 23 has a wall thickness greater than that of the external intubation tube 16. Balls 24 with a large diameter are fitted and held in each slide ring 1, and normally these balls 24 are located inside the external tube 16.
The operating ring 17, which is pushed outward in contact with the outer circumferential surface of the outer tube 8 and located outside the outer intubation tube 16, has an inner diameter enlarged to form a large diameter portion 25 on the inner circumferential surface of the front end thereof;
This large diameter portion 25 is connected to a small diameter portion 27 via an inclined stepped portion 26 . Normally, the inclined stepped portion 26 comes into contact with the exposed portion of the sphere 24 pushed up by the slide ring 18 due to the elasticity of the coil spring 21, thereby causing the operating ring 17 to detach forward from the external tube 16. is prevented. Further, the rear end of the slide ring 18 has an inner flange 18'' that protrudes inward, and this inner flange 18'' is normally attached to a stopper ring 2 provided on the outer periphery of the fitting shaft 14.
8 and is prevented from coming off forward. An air supply path 29 and a water supply channel 30 are provided inside the fitting shaft body 14, which are open at the distal end thereof and communicate independently with each passage 2, 3, 4 in the handpiece body A. These extend rearward and are opened in the recess 12 and the protrusion ring 13.The connecting body 20 is integrally provided with a fitting protrusion 31 that fits into the recess 12 at the tip, and has an opening in the recess 12 and the protrusion ring 13. A connecting pipe 33 for connecting the water supply hose 32 is protruded from the end.In addition, a water pipe 33 is provided in the connecting body 20, the tip of which opens at the tip of the fitting convex portion 31, and the rear end of which communicates with the connecting pipe 33. A passage 34 and an air passage 35 whose front end opens within the protruding ring 13 and whose rear end opens at the rear end surface of the connecting body 20 are formed, and a collar 36 is provided at an intermediate position on the outer periphery. The connecting body 20 has a distal end rotatably fitted into the concave portion 12 via an O-ring 37, and a rear end thereof which is connected to the water supply hose 3.
2 and connected thereto is a flexible supply hose 19 that guides pressurized air from a pressurized air supply source. 39 is the connecting body 2
This bearing ring rotatably supports the middle part of the outer periphery of the bearing ring 13, and is fixed to the protruding ring 13 by a cap nut 40 screwed onto the outer periphery of the protruding ring 13, and the rear surface of this bearing ring 39 and the cap nut By positioning the collar 36 between the end face 4' of the connector 40, the connecting body 20 is prevented from coming off. 41 is a cover ring, and the front part of this is the connecting ring 4.
2 to the outer peripheral rear portion of the external intubation tube 16.

When the handpiece body A is removed from the joint member B, the slide ring 18 pushes the sphere 24 outward as shown in FIG.
When connecting the handpiece body A to the coupling member B from this state, the fitting recess 5
Insert the fitting shaft body 14 inside. Then, the connecting tube 7 presses the slide ring 18 against the coil spring 22, and the sphere 2
4 falls into and engages with the annular groove 8 provided in the connecting tube 7, and at the same time, the inclined stepped portion 26 of the operation ring 17 comes off from the sphere 24, so the operation ring 17 moves forward and pushes down the sphere 24 with the small diameter portion 27. . Therefore, the state of engagement between the sphere 24 and the annular groove 8 is ensured, and the stopper 17'' provided on the operating ring 17 comes into contact with the sphere 24. In this way, the fitting shaft 14 is inserted into the fitting recess 5. The outer tube 16 is rotatably fitted via an O-ring, and the outer tube 16 is rotatably connected to the connecting tube 7 via a sphere 24. Therefore, the pressurized air supplied to the flexible supply hose 9 is The air passes through the air passage 35, the air supply passage 29, and the air passages 2 and 3 in the handpiece body A, and drives the air turbine installed in the air turbine head 1 at the tip thereof, and a part of the air is used as mist generation air. It ejects from the bottom of the air turbine head.

Further, the water supplied to the water supply hose 32 is guided to the water passage 4 in the handpiece body A through the water passage 34 and the water supply passage 30, and is ejected from the lower surface of the air turbine head together with air. Next, when separating the handpiece body A from the joint member B, pull the operating ring 17 backward against the coil spring 21 so that the sphere 24 faces the large diameter portion 25, and from this state, the handpiece body A is removed. When pulled forward, the sphere 24
The handpiece body A is disengaged from the ring groove 6, and the handpiece body A can be pulled out.

With this pulling operation, the slide ring 18 moves forward due to the coil spring 22 and receives the sphere 24 again on its outer peripheral surface, resulting in the state shown in FIG. 2. As described above, according to the present application, the connection between the therapeutic instrument main body and the joint member to which the flexible supply hose is attached is automatically performed by simply inserting the fitting shaft into the fitting cylinder, and Since its removal is easily performed by moving the connecting ring, it is possible to easily and quickly replace the therapeutic instrument body with respect to the joint member, and the connection state is reliable, and the fitting shaft body can be inserted into the fitting cylinder. By inserting the treatment instrument body into the joint member, the treatment instrument body and the joint member become rotatable. In particular, according to the present application, the joint member is formed by rotatably fitting and connecting a connecting body with a flexible supply hose attached to the rear end of the fitting shaft.
At the fitting part between the fitting cylinder and the fitting shaft, the pressure of the pressurized air in the fitting recess increases due to the tightness of the pressurized air, and the smooth relative rotation between them is impaired. However, since relative rotation is made between the fitting shaft and the connecting body, smooth rotation of the flexible supply hose with respect to the therapeutic device main body is ensured, and the operability of the therapeutic device main body is improved. This has the advantage of eliminating the risk of damage due to excessive twisting force being applied to the flexible supply hose.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, and FIG. 1 is an overall side view, FIG. 2 is a side view of the main parts with the treatment instrument main body and the joint member separated and shown partially longitudinally, and FIG. Figure 3 is a longitudinal sectional side view showing the main parts of the connected state.
5 is a fitting recess, 6 is a fitting cylinder, 7 is a connecting tube, 12 is a recess, 13 is a protruding ring, 14 is a fitting/shaft body, 16 is an external tube, 17 is an operating ring, 18 is a slide ring, 19 is a flexible supply hose, 20 is a connecting body, 21 and 22 are coil springs, 23 is a through hole, 24 is a sphere, 25 is a large diameter portion, 26 is an inclined stepped portion, 27 is a small diameter portion, and 29 is an air supply road, 30 is water supply)
31 is a fitting projection, 32 is a water supply hose, 33 is a connecting pipe, 34 is a water passage, 35 is an air passage, 36 is a collar, 39 is a bearing ring, and 40 is a nut.

Claims (1)

[Claims] 1 A fitting cylinder having a piping system inside the front end and a fitting recess communicating with the piping system inside the rear end is provided in the shaft cylinder, and a connecting cylinder is arranged concentrically around the outer periphery of the rear end of the fitting cylinder. A treatment instrument main body is provided in the body and has an annular groove formed on the rear outer periphery of the connecting tube, and a fitting shaft body rotatably fitted and connected to the fitting tube is provided with a feed supply opening at the distal end thereof. An air passage and a water supply channel are respectively provided, and the rear end thereof is opened into large and small recesses provided concentrically around the rear end of the fitting shaft body, and a flexible tube is inserted into the large and small recesses at the rear end. The distal end of the connecting body has a fluid passage inside which connects the sex supply hose and guides one fluid supplied by the hose into a large diameter recess and the other fluid into a small diameter recess. The fitting shaft is rotatably fitted and connected, and further has a thickness on the outer periphery of the fitting shaft to receive the rear part of the connecting cylinder on the inner periphery when the fitting shaft is fitted and connected to the fitting recess. The outer tube is provided in a concentric manner, and a through hole is formed at the distal end of the outer tube to hold a sphere having a diameter larger than the wall thickness of the outer tube and to engage with the annular groove, and the inner circumference of the outer tube is and the outer periphery of the fitting shaft body, the sphere is constantly pressed in the front end direction to push the sphere outward, and when the fitting shaft body is fitted and connected to the fitting recess, the rear end of the connecting cylinder A slide ring that retreats when pressed, and an operating ring that has a large diameter part and a small diameter part connected to each other on the inner surface of the front end via an inclined stepped part on the outer periphery of the external intubation tube, and that is always pressed forward. When the fitting shaft body is fitted and connected to the fitting recess, the small diameter portion of the operation ring presses the sphere to engage it in the annular groove of the connecting cylinder. A dental treatment instrument that is made by tightening.