JPH0698898A - Dental handpiece - Google Patents

Abstract

PURPOSE:To enable the prevention of contamination by a pathogen in a clinic and cross infection between a patient and an operator. CONSTITUTION:A handpiece 1 is provided internally with a drive air circuit 2, an exhaust circuit 3, a chip air circuit 4 and a water circuit 5. A check valve 7 whose tip is made up of an elastic member is mounted in the exhaust circuit 3 at a head part 6 of the handpiece 1. With such an arrangement, reversion is blocked to a hose mounted on a dental handpiece 1 and a dental treatment machine connected to the hose involved. Contamination from a pathogen or the like as caused by sucking action is checked within the dental handpiece even in the worst case and the dental handpiece is sterilized thereby enabling the prevention of contamination in the clinic and cross infection between a patient and an operator.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dental handpiece for preventing pathogenic bacteria and bacteria of the handpiece from contaminating a dental treatment machine through the hose and preventing cross infection between a patient and an operator. About Su

[0002]

2. Description of the Related Art Conventionally, in a handpiece, a drive air circuit for rotating a rotor, a water circuit for cooling a bar and teeth, a blown powder for blowing off cutting powder and atomizing water. Four circuits, a chip air circuit and a drive air exhaust circuit, are internally provided.

[0003]

However, no suction or backflow treatment is taken in the four circuits of the prior art. Therefore, in the dental handpiece, due to the inertial rotation of the rotor after the supply of the drape air is stopped, the suction action is generated in the exhaust circuit or the gap between the handpiece head and sucks the contaminants in the patient's oral cavity. However, there was a risk of cross-infection to other patients or operators or contamination in the clinic.

Therefore, the present invention was developed in view of the above-mentioned drawbacks of the prior art, and a check valve is provided in at least one of the circuits provided in the handpiece to provide drive air. It is an object of the present invention to provide a dental handpiece capable of preventing suction and backflow that occur when the supply is stopped.

[0005]

SUMMARY OF THE INVENTION The present invention provides a drive air circuit, an exhaust circuit, a chip air circuit, and a water circuit in a handpiece for rotating a rotor supported by a bearing by compressed air for cutting treatment. At least one of the circuits is provided with a check valve having a structure that allows flow only in one direction.

[0006]

According to the present invention, at least one of the circuits provided in the handpiece is provided with a check valve having a structure that allows only one direction of flow, so that contaminants generated when the air and water sources are stopped. Can be prevented from being sucked.

[0007]

Embodiment 1 FIGS. 1 to 4 show this embodiment, FIG. 1 is a sectional view of a hand piece, FIG. 2 is a partial bottom view of the tip of the hand piece, and FIGS. 3 and 4 show the operation of a check valve. It is an explanatory view shown.

1 is a hand piece, and this hand piece 1
A drive air circuit 2, an exhaust circuit 3, a chip air circuit 4 and a water circuit 5 are internally provided in. The exhaust circuit 3 in the head portion 6 of the handpiece 1 is fitted with a check valve 7 whose tip is formed of an elastic member.

In the handpiece 1 having the above-described structure, the opening of the check valve 7 attached to the exhaust circuit 3 is closed at normal times and at the time of reverse flow of the pressurized fluid 8, and the fluid pressure at the time of forward flow of the pressurized fluid. This opens the opening of the check valve 7.

According to this embodiment, the check valve 7 can prevent the backflow of pollutants from the exhaust circuit 3.

[0011]

Embodiment 2 FIGS. 5 to 9 show this embodiment, FIG. 5 is a sectional view of a hand piece, FIG. 6 is a partial bottom view of the tip of the hand piece, and FIGS. 7 and 8 show the operation of a check valve. FIG. 9 is a sectional view of a hand piece showing a modified example.

The handpiece 11 of the present embodiment has check valves 12, 13, respectively for the drive air circuit 2, the chip air circuit 4 and the water circuit 5 of the first embodiment.
The structure is different from that of FIG. 14 except that the other structure is composed of the same constituent parts, and the same constituent parts are designated by the same reference numerals, and the description of the structure will be omitted.

The hand piece 11 having the above structure is
At normal times and when the pressurized fluid 8 flows backward, the openings of the check valves 12, 7, 13, 14 attached to the drive air circuit 2, the exhaust circuit 3, the chip air circuit 4 and the water circuit 5 are closed to pressurize. When the fluid flows forward, the fluid pressure causes the openings of the check valves 12, 7, 13, and 14 to open.

According to this embodiment, the drive air circuit 2,
By providing the check valves 12, 7, 13, and 14 in all of the exhaust circuit 3, the chip air circuit 4, and the water circuit 5, it is possible to further prevent suction of contaminants as compared with the first embodiment.

The present invention does not limit the mounting positions of the check valves 12, 7, 13 and 14 to the drive air circuit 2, the exhaust circuit 3, the chip air circuit 4 and the water circuit 5, but is shown in FIG. Similarly, it may be attached to the central portion of the hand piece 11 or the like.

[0016]

As described above, according to the dental handpiece of the present invention, the drive air circuit, the exhaust circuit,
By providing a check valve in at least one of the tip air circuit and the water circuit, backflow to the hose attached to the dental handpiece and the dental treatment machine to which the hose is connected is prevented. In the worst case, contamination from a pathogen or the like due to the suction action can be stopped in the dental handpiece. Therefore, by sterilizing and disinfecting the dental handpiece, it is possible to prevent contamination in the medical office,
Cross-infection of patients and operators can be prevented.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a hand piece showing a first embodiment.

FIG. 2 is a partial bottom view of the handpiece tip according to the first embodiment.

FIG. 3 is an explanatory diagram of the operation of the check valve according to the first embodiment.

FIG. 4 is an explanatory diagram of the operation of the check valve according to the first embodiment.

FIG. 5 is a sectional view of a hand piece showing a second embodiment.

FIG. 6 is a partial bottom view of the handpiece tip according to the second embodiment.

FIG. 7 is an explanatory diagram of the operation of the check valve according to the second embodiment.

FIG. 8 is an explanatory diagram of the operation of the check valve according to the second embodiment.

FIG. 9 is a sectional view of a hand piece showing a modification of the second embodiment.

[Explanation of symbols]

 1 Handpiece 2 Drive air circuit 3 Exhaust circuit 4 Chip air circuit. 5 Water Circuit 6 Head 7 Check Valve 8 Pressurized Fluid 11 Hand Pace 12 Check Valve 13 Check Valve 14 Check Valve

Claims (1)

[Claims] 1. In a handpiece for cutting treatment by rotating a rotor supported by a bearing with compressed air, at least one of a drive air circuit, an exhaust circuit, a chip air circuit and a water circuit is provided. A dental handpiece characterized by being provided with a check valve
Su.