JP5599103B2 - Dental handpiece and suction prevention ring sheet thereof - Google Patents

Description

  The present invention prevents foreign matter from entering the head portion by the suction pump action generated in the head portion of the dental air turbine handpiece, and is generated between the patient and the operator and between the patient and the patient through the hand piece. The present invention relates to a dental handpiece designed to prevent cross infection.

Such handpieces are described in, for example, Japanese Patent Application Laid-Open No. 2000-060870 and Japanese Patent No. 3795722.
That is, in Japanese Patent Application Laid-Open No. 2000-060870, in a turbine chamber of a dental handpiece, a supply line for a flowing pressure medium is opened at a position of an inlet opening, and a discharge line is a position of an outlet opening. In this way, after the supply of the pressure medium is stopped, the rotating pressure medium rotating in the turbine chamber is discharged through the discharge line after the turbine impeller is in operation. Means for preventing this are provided. This means is characterized in that the pressure medium rotating in the turbine chamber is deflected beyond the outlet opening, protruding into the flow of the rotating pressure medium and rotating in functional operation. By having a flow web that forms a flow step for the medium, it prevents the pressure medium from exiting through the outlet opening, in other words, forms a curtain and provides pumping, suction or suction back. It is supposed to prevent.

  Further, for example, in Japanese Patent No. 3795722, a sealing member is provided in a portion where an annular gap is formed around a cutting tool or a cutting tool holder mounted on a head portion of a dental handpiece, and the cutting tool Alternatively, a contact piece that contacts the cutting tool holder and closes the gap is formed in the seal member in an annular shape, and at least a portion of the contact piece that contacts the cutting tool or the cutting tool holder is formed of an elastic body, The contact piece is pushed outward by the pressure of the working gas inside the head that rises when the cutting tool is operated to move away from the cutting tool or the cutting tool holder, and closes and closes the gap when the cutting tool is inactive. There has been proposed a medical cutting machine that is configured and prevents foreign substances that are contaminants from entering.

JP 2000-060870 A Japanese Patent No. 3795722

The object of the present invention is to focus on such problems, and to prevent foreign substances such as saliva and blood from entering from the gaps generated around the cutting tool. • To provide a dental handpiece that can prevent cross-contamination between patients.
Another object of the present invention is to provide a suction prevention ring sheet that can be attached to such a dental handpiece and can prevent cross-contamination between patients and surgeons and between patients and patients.

The dental handpiece of the present invention rotatably accommodates an impeller in a head portion, and rotates the impeller and a required tool held by the air by air injected from an air supply port formed in the head portion. In a dental handpiece for discharging air that rotates and moves with an impeller from an exhaust port formed in the head part,
The ring seat is mounted and fixed so that it is sandwiched between the bearing lower surface and the head bottom located at the lower part of the impeller,
The ring sheet is formed so that at least the inner diameter does not contact the rotating shaft, and a plurality of cuts are provided from the inner diameter to the outer diameter direction.
When the impeller rotates and the pressure in the head becomes positive, the fan-shaped piece formed by cutting the ring sheet is pushed open by bending toward the bottom of the head,
When the rotation of the impeller is stopped, the pressure in the head becomes negative, so that the fan-shaped piece is sucked into the head and closely contacts the lower surface of the bearing, thereby closing the annular gap between the inner ring and the outer ring of the bearing. Thus, the structure is such that foreign matter can be prevented from entering the head.

As described above, according to the present invention, the structure according to claim 1 prevents foreign matter from entering the head even when the pressure in the head becomes negative when the cutting tool stops rotating. be able to.
In particular, the conventional ring sheet prevents the suction action by contacting a member that rotates at a high speed, whereas the present invention does not cause wear due to the contact of the ring sheet, so that the durability is improved in each stage. be able to. Accordingly, it is possible to prevent foreign substances such as saliva and blood from entering the head due to deterioration over time, and safety and reliability can be improved.
Moreover, there is an effect of preventing the turbine sound rotating at a high speed by the ring sheet from being reflected to the outside.
Furthermore, since it is possible to remove the head cap and easily attach the ring sheet to a dental handpiece that has not taken measures against foreign object intrusion, the suction prevention ring sheet of the present invention is a foreign object to conventional products. It is also effective as an intrusion prevention measure.

The ring sheet according to claim 1 is made of an elastic material, and is provided with a plurality of cuts that are equally divided radially from an inner diameter to an outer diameter direction.
According to the second aspect of the present invention, the ring sheet is made of an elastic material, and a plurality of cuts that are equally divided radially from the inner diameter to the outer diameter direction are provided. The impeller is rotated by the air jetted from the air mouth, and the fan-shaped thin cantilever formed by the cut of the ring sheet can be appropriately bent by the air flow discharged from the bottom of the head portion.

Furthermore, when the head part becomes a negative pressure according to the change in the pressure in the head part, the bending of the fan-shaped thin cantilever beam of the ring sheet returns to its original state, and can be surely brought into close contact with the bearing lower surface by the negative pressure.
Furthermore, the amount of bending can be adjusted by changing the thickness of the ring sheet and the number of cuts, and the number of cuts can be set according to the pressure of various air turbines and supply air. it can.

In the suction prevention ring sheet according to claim 3, the ring sheet is made of a heat resistant material.
By configuring as in claim 3, the ring sheet can be composed of a heat-resistant material such as Teflon (registered trademark), and therefore, sterilization can be performed with a sterilizer such as an autoclave while the ring sheet is mounted. It becomes possible.

  Due to the negative pressure generated in the head due to inertial rotation of the impeller after the stop of air injection to the impeller, the bending of the fan-shaped thin cantilever beam of the ring sheet returns to the original, and the fan-shaped piece eventually becomes a bearing due to the negative pressure. This makes it possible to prevent foreign matter from entering the head portion.

It is a bottom view of the dental handpiece of the present invention. It is the partial enlarged bottom view similarly. 2 is a cross-sectional view taken along the line A-A in FIG. 2, showing the head portion of the dental handpiece of the present invention. It is BB sectional drawing of FIG. 3 which shows the head part of this invention dental handpiece. (A) is a perspective view which shows the suction prevention ring sheet of this invention dental handpiece, (b) is a top view which shows the suction prevention ring sheet of this invention dental handpiece. It is the top view which removed the impeller from the head part of this invention dental handpiece, and was seen from the upper part of the head part.

  FIG. 1 is a bottom view of a dental handpiece according to the present invention, FIG. 2 is a partially enlarged bottom view of the head portion of the present invention as seen from the direction of attaching / detaching a tool, and FIG. 3 is a diagram of the head portion of the present invention. It is AA sectional drawing of 2. 4 is a cross-sectional view (cross-sectional view taken along the line BB in FIG. 3) of the head portion cut in the horizontal direction with respect to the impeller.

Embodiments of the present invention will be described below.
As shown in FIGS. 1 and 2, the dental handpiece 1 of the present invention comprises a head portion 2 and a main body portion 3, and is connected to a dental treatment apparatus (not shown) behind the main body portion 3. A hose joint 4 is provided. The compressed air supplied from the dental treatment apparatus is supplied into the head unit 2 through an air supply port (see FIG. 4) in the head unit 2 via the hose joint 4.

As shown in FIGS. 3 and 4, an impeller 11 is rotatably accommodated in the head portion 2, and the impeller 11 and a tool (not shown) held by the tool holding member 12 are included in the head portion 2. The air that is rotated by the air injected from the air supply port 14 of the air supply pipe 13 formed in the above and rotates together with the impeller 11 flows from the exhaust port 15 formed in the head portion 2 to the exhaust pipe 16.
At this time, the rotating and moving air flows into the exhaust pipe 16 and at the same time, is released to the atmosphere from the gap of the push cap 21 and the gap 22 of the bottom 22 of the head 2, but the discharge from the head bottom 22 is It passes through the space between the inner ring and the outer ring of the bearing A (24) located at the lower part of the impeller 11, reaches the head part bottom part 22 (FIG. 3), and is discharged.

  In the present invention, the ring sheet 41 shown in FIGS. 5a and 5b is attached and fixed so as to be sandwiched between the lower surface of the bearing A (24) and the head portion bottom portion 22, thereby preventing foreign matter from entering.

Further details will be described with reference to the drawings.
As shown in FIG. 3, a clearance groove 25 is formed on the head bottom 22 so as not to interfere with the inner ring of the bearing A (24), and a ring seat 41 is mounted and mounted thereon. FIG. 6 is a plan view of the head portion 2 from which the head cap 28 and the impeller 11 are removed and viewed from the top of the head portion 2. In this way, the ring sheet 41 is placed on the head portion bottom portion 22 and the O-ring. The impeller 11 is incorporated into the cartridge installation space 42 (see FIG. 6) via A (26), and is fixed by the head cap 28 via the O-ring B (27), and the ring sheet 41 is stored.

  The impeller 11 has a structure in which blades are formed around a tool holding member 12 that allows a tool (not shown) to be attached and detached. A cartridge structure is configured so that the bearing A (24) and the bearing B (29) are press-fitted into the tool holding member 12 with the impeller 11 interposed therebetween. The tool holding member 12 has a structure in which the holding portion is opened and closed by pushing the push cap 21 from above, and the tool can be attached and detached. The bearing A (24) and the bearing B (29) are constituted by an inner ring 31 and an outer ring 32, and a ball 33 provided between the inner ring 31 and the outer ring 32, respectively.

Next, the ring sheet will be described.
As shown in FIG. 5a, the ring sheet 41 is provided with a plurality of incisions 43 radially from the inner diameter to the outer diameter direction so that a so-called fan-shaped piece 44, that is, a fan-shaped thin cantilever 45 can be formed. .

  The ring seat 41 shown in FIG. 5a and FIG. 5b is divided into four equal parts, but this may be divided into a plurality of equal parts, whether it is five equal parts or six equal parts. The fractional number is arbitrary. The fraction of the ring sheet 41 can be determined in relation to the adjustment of the deflection amount.

  The material of the ring sheet 41 is made of an elastic material, and is preferably a Teflon (registered trademark) material that is heat resistant even when sterilized by a sterilizer such as an autoclave, but is not limited to a Teflon (registered trademark) material. The thickness of the material can be set to any thickness as long as the thickness is flexible in response to a change in air pressure in the head.

  As shown in FIG. 3, the impeller 11 is rotatably accommodated, and the impeller 11 and a tool (not shown) held by the impeller 11 are supplied from an air supply port 14 formed in the head portion 2. The fan-shaped thin cantilever 45 of the ring sheet 41 is rotated by the jetted air (see FIG. 4), and the fan-shaped piece 44 is pushed downward.

  And after stopping the injection of the air to the said impeller 11 from the said air inlet 14 (refer FIG. 4), it moves toward the said exhaust port 15 from the said impeller 11 during the inertial rotation of the said impeller 11 The air that flows into the exhaust pipe 16 flows at the same time, but at the same time, in the vicinity of (in the vicinity of) the air inlet 14, “positive pressure” to “same pressure (relative to atmospheric pressure)” and “same pressure” to “negative”. The pressure decreases to “pressure” and the entire inside of the head portion 2 becomes negative pressure.

The bending of the fan-shaped thin cantilever 45 of the ring sheet 41 returns to the original according to the change in the pressure in the head portion 2, and the fan-shaped piece 44 eventually comes into close contact with the lower surface of the bearing 24 by negative pressure.
Such behavior of the ring sheet 41 prevents foreign matter from entering the head portion 2.

  The present invention is not limited to a dental handpiece, and can be widely used to reduce the cause of infection caused by foreign objects entering the instrument and improve the safety of medical care in dental micromotors, medical cutting instruments, etc. Is.

DESCRIPTION OF SYMBOLS 1 Dental handpiece 2 Head part 3 Main body part 4 Hose joint 11 Impeller 12 Tool holding member 13 Air supply pipe 14 Air supply port 15 Exhaust port 16 Exhaust pipe 21 Push cap 22 Head part bottom part 23 Head part bottom part clearance 24 Bearing A
25 Relief groove 26 O-ring A
27 O-ring B
28 Head cap 29 Bearing B
31 Inner ring 32 Outer ring 33 Ball 41 Ring sheet 42 Cartridge installation space 43 Notch 44 Fan-shaped piece 45 Fan-shaped thin cantilever (cantilever)

Claims (3)

An air that rotatably accommodates an impeller in a head portion, rotates the impeller and a required tool held by the air injected from an air supply port formed in the head portion, and rotates together with the impeller. In the dental handpiece that discharges from the exhaust port formed in the head part,
The ring seat is mounted and fixed so that it is sandwiched between the bearing lower surface and the head bottom located at the lower part of the impeller,
The ring sheet is formed so that at least the inner diameter does not contact the rotating shaft, and a plurality of cuts are provided from the inner diameter to the outer diameter direction.
When the impeller rotates and the pressure in the head becomes positive, the fan-shaped piece formed by cutting the ring sheet is pushed open by bending toward the bottom of the head,
When the rotation of the impeller is stopped, the pressure in the head becomes negative, so that the fan-shaped piece is sucked into the head and closely contacts the lower surface of the bearing, thereby closing the annular gap between the inner ring and the outer ring of the bearing. The dental handpiece is configured to prevent foreign matter from entering the head.   The ring sheet according to claim 1, wherein the ring sheet is made of an elastic material, and is provided with a plurality of cuts that are equally divided radially from an inner diameter to an outer diameter direction.   The dental ring for preventing dental handpiece according to claim 2, wherein the ring sheet is made of a heat-resistant material.

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