JP2014090892A - Cartridge type dental handpiece - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cartridge type dental handpiece, capable of reducing component costs to lessen a user's burden, achieving an air mixed quantitative jet of two fluids, water and the air, and simplifying and facilitating maintenance work and cleaning work.SOLUTION: Water and the air are supplied from a handpiece body 2 side to a handpiece head part 11, and a storing area 12 for a cartridge housing 21, the lower end face inner peripheral side of which is opened is formed in the interior. The outlet side of one communicating passage 13 communicated with one fluid passage 3 is faced on the inner wall surface forming the storing area 12, and the outlet side of another communicating passage 14 communicated with another fluid passage 4 is taken as another fluid jet orifice 15 opened at the lower end face 11a. In the storing area 12 of the handpiece head part 11, the handpiece head part 11 is removably mounted with the lower end face 21a facing to the inside of the lower end face 11a.

Description

  The present invention relates to a cartridge-type dental handpiece, and more particularly to a cartridge-type dental handpiece having a water injection cooling function for a cutting working surface of a cutting tool.

  Conventionally, in a dental treatment, a cartridge with a cutting tool that is driven to rotate is built in the handpiece head part, and when the affected part is deleted, heat generated by the cutting is cooled and chips generated by the cutting are removed. For this reason, a cartridge-type dental handpiece configured to mix and spray water and air from the handpiece head side to the cutting action surface of a cutting tool has been proposed and put into practical use.

  In this type of cartridge-type dental handpiece, it is required to reduce the burden on the user by reducing the cost of parts, to realize the fixed injection of water and two air fluids, and to simplify the maintenance work and cleaning work. Is done.

  Patent Document 1 discloses a cartridge-type dental hand constructed by detachably mounting a cartridge case, a bar sleeve for holding a dental treatment tool, and a cartridge having upper and lower bearings on a head housing at the tip of a dental handpiece. In the piece, the cartridge includes a protrusion that protrudes to the lowermost end of the head housing beyond the lower bearing, and the outer peripheral surface of the protrusion is ring-shaped between the inner surface of the head housing in the mounted state. A concave groove forming a fluid passage is provided, and a fluid ejection hole (spray hole) communicating with the concave groove is formed in the lower end surface of the cartridge. Further, the head housing opens to the inner peripheral surface of the hand piece. A dental handpiece comprising a communication hole for feeding fluid from a fluid supply path disposed in the body to the fluid passage. There has been proposed.

  However, in the case of the dental handpiece of Patent Document 1, a spray mechanism for mixing water and air is provided between the inner surface of the head housing and the outer peripheral surface of the protruding portion located in the head housing of the cartridge. It is a structure that ejects fluid consisting of water and air mixed from the fluid ejection holes provided on the lower end surface, and has two concave grooves on the outer peripheral surface of the cartridge, and communicates with the two concave grooves inward from the lower end surface. Fluid injection holes must be provided, which increases the processing cost of the cartridge, and increases the burden on the user considering that the cartridge is a consumable part and a replacement part at the installation site.

  In addition, the dental handpiece of Patent Document 1 is an internal mixing system of two fluids composed of water and air, and there is a problem that it is difficult to quantitatively inject these two fluids due to the pressure balance of the two fluids.

  Furthermore, in the case of the dental handpiece of Patent Document 1, it is necessary to remove the cartridge from the head housing, and to perform maintenance and cleaning of the two concave grooves and the fluid ejection holes communicating with the two concave grooves. Work and cleaning work become complicated.

Japanese Patent Publication No. 7-14397

  The problems to be solved by the present invention are that the burden on the user can be reduced by reducing the cost of the components, the air-mixed fixed quantity injection of water and air can be realized, and further maintenance work and cleaning work There is no cartridge-type dental handpiece that can be simplified.

  The cartridge-type dental handpiece according to the present invention has a cartridge housing containing area in which water and air are fed from the handpiece main body side by two fluid flow paths and the inner peripheral side of the lower end surface is opened inside. Formed and communicated with one of the two fluid flow paths, the outlet side of one of the communication flow paths faces the inner wall surface forming the housing region, and communicates with the other fluid flow path. A handpiece head portion that has the other fluid flow outlet opening on the lower end surface at the outlet side of the other communication flow path, and a lower end surface below the handpiece head portion in the receiving area of the handpiece head portion. Removably mounted facing the inside of the end face, and the rotationally driven cutting tool protrudes from the center of the lower end face and is detachably held, corresponding to the outlet side of the one communication channel The outer wall A cartridge housing having a cartridge housing flow path leading to one fluid ejection opening that opens to the lower end surface through the inside, and one fluid ejection in the cartridge housing flow path through the one fluid flow path and the communication flow path Either water or air from the mouth, the other fluid flow path and the communication flow path, the other fluid injection port of the handpiece head part, either water or air is mixed with water or air in the atmosphere The most important feature is that it is configured to spray toward the cutting surface area of the cutting tool.

  According to the first aspect of the present invention, the water and air are mixed outside the cartridge housing and the handpiece head, and the pressure balance of water and air in the handpiece head is based on the air-air mixing method. It is possible to make a fixed-discharge spray structure that does not act, simplify the structure of the cartridge housing, and reduce the burden on the user by reducing the processing cost. In a state where it is removed from the head part, the recessed groove part and the fluid ejection port of the cartridge housing flow path are exposed to the outside, and the fitting member including the other fluid ejection port is also exposed to the outside on the handpiece head part side, Simplified maintenance and cleaning work for cartridge housing and handpiece head It is possible to provide a dental handpiece of cartridge that can be achieved also of.

  According to the second aspect of the present invention, water is ejected from one fluid ejection port on the cartridge housing side toward the cutting action surface area by the cutting tool, and air is ejected from the other fluid ejection port on the handpiece head side. Can be provided on the basis of the structure in which the cutting tool is sprayed toward the cutting action surface area of the cutting tool.

  According to the third aspect of the present invention, air is ejected from one fluid ejection port on the cartridge housing side toward the cutting action surface area by the cutting tool, and water is ejected from the other fluid ejection port on the handpiece head side. Can be provided on the basis of the structure in which the cutting tool is sprayed toward the cutting action surface area of the cutting tool.

FIG. 1 is a schematic sectional view of a handpiece head portion and a cartridge housing in a cartridge type dental handpiece according to an embodiment of the present invention. FIG. 2 is a schematic view showing the appearance of the cartridge housing removed from the handpiece head portion of the cartridge-type dental handpiece according to the present embodiment. FIG. 3 is a schematic perspective view of the cartridge housing holding the handpiece head portion and the cutting tool in the cartridge type dental handpiece according to the present embodiment as seen from the lower end surface side. FIG. 4 is a plan view of the fitting member in the cartridge-type dental handpiece according to the present embodiment. FIG. 5 is a schematic view showing the appearance of the cartridge-type dental handpiece according to the present embodiment. FIG. 6 is a schematic cross-sectional view showing another example of water and air jets in the cartridge type dental handpiece according to the present embodiment.

  The cartridge of the present invention can reduce the burden on the user by reducing the cost of the parts, can perform the air-mixed fixed quantity injection of water and air, and can simplify the maintenance work and the cleaning work. The purpose of providing a dental handpiece of the type is a housing area for a cartridge housing in which water and air are fed from the handpiece main body side through two fluid flow paths and the inner peripheral side of the lower end surface is opened inside The outlet side of one communication channel that communicates with one of the two fluid channels is exposed to the inner wall surface that forms the housing region, and communicates with the other fluid channel. A handpiece head portion having an outlet side of the other connecting flow path formed as the other fluid ejection port opened in the lower end surface, and a lower end surface of the handpiece head portion in the accommodation region of the handpiece head portion. The cutting tool to be rotationally driven is mounted so as to protrude from the center of the lower end surface, and is detachably held so as to face the inside of the lower end surface of the head portion. A cartridge housing having a cartridge housing flow path from the outer wall corresponding to the outlet side to the one fluid ejection port that opens to the lower end surface through the inside, and the cartridge passes through the one fluid flow path and the communication flow path. The cutting tool is configured to mix water from one fluid ejection port in the housing channel, air from the other fluid ejection port of the handpiece head portion through the other fluid channel and the communication channel, and a water / air atmosphere mixing method. This is achieved by spraying toward the cutting action surface area.

  Hereinafter, a cartridge type dental handpiece according to an embodiment of the present invention will be described in detail with reference to the drawings.

  A cartridge-type dental handpiece 1 according to this embodiment is used for dental treatment. As shown in FIG. 5, a hand in which a cartridge housing 21 to be described later in detail is built in one end of a handpiece body 2. A piece head 11 is provided.

  The handpiece head portion 11 and the cartridge housing 21 will be described in detail with reference to FIGS.

  As shown in FIG. 1, the handpiece head portion 11 in the cartridge type dental handpiece 1 according to the present embodiment is formed in a substantially cylindrical shape as a whole, and in FIG. In addition, the taper shape is reduced in diameter as it reaches the lower end surface 11 a, and a part of the outer peripheral portion is connected to one end of the handpiece body 2.

  A storage area 12 for the cartridge housing 21 is formed inside the handpiece head portion 11 and has an inner peripheral side of the lower end surface 11a opened in a circular shape.

  One of the fluid passages 3 provided on the handpiece body 2 side and the other fluid passage 4 communicated with each other inside the connection portion of the handpiece head portion 11 with the handpiece body 2. A communication channel 13 and the other communication channel 14 are provided.

  The other communication channel 14 communicated with the other fluid channel 4 with the outlet side of the one communication channel 13 communicated with the one fluid channel 3 facing the inner wall surface forming the accommodating region 12. The other fluid ejection port 15 is opened at the lower end surface 11a.

  That is, the inner peripheral region of the lower end surface 11 a of the handpiece head portion 11 is formed with an inner peripheral notch recess 11 b over the entire circumference, and the outer peripheral notch recess 21 b is formed on the outer peripheral portion of the lower end surface 21 a of the cartridge housing 21. Forming.

  And in the area | region of the inner periphery notch recessed part 11b and the outer periphery notch recessed part 21b, it has a cyclic | annular form and has the rising part 16a in the outer peripheral part, and it is located inside the rising part 16a in the bottom plate part 16b, for example in the circumferential direction The fitting member 16 in which three fluid ejection ports 15 are formed at intervals of 120 degrees is fitted, and the three fluid ejection ports 15 are positioned immediately next to the outer periphery of the lower end of the cartridge housing 21.

  The cartridge housing 21 is detachably mounted in the accommodation area 12 of the handpiece head portion 2 with the lower end surface 21a facing the lower end surface 11a of the handpiece head portion 11.

  Inside the cartridge housing 21, bearings 22, 22 are arranged in an up-and-down arrangement, a rotary shaft 23 is rotatably held by the upper and lower bearings 22, 22, and the outer periphery of the rotary shaft 23 is rotationally driven by air pressure. Ruru rotor 24 is attached.

  In addition, the upper side of the cutting tool 31 is detachably attached to the rotating shaft 23, and the lower side (protruding end side) of the cutting tool 31 protrudes downward from the lower end central portion of the cartridge housing 21. It is configured to face the cutting surface area.

  Further, the cartridge housing 21 includes a cartridge housing flow path 25 that extends from the outer wall corresponding to the outlet side of the one communication flow path 13 to the one fluid ejection port 26 that opens to the lower end surface 21a through the inside. Yes.

  The cartridge housing flow path 25 includes a recessed groove portion 27 formed from the outer wall portion to the inside, and three portions, for example, spaced 120 degrees in the circumferential direction, drilled from the inner end portion of the recessed groove portion 27 toward the lower end surface 21a. Each of the injection flow paths 28 is formed in an inverted L shape with each of the lower end surfaces 21a of the respective injection flow paths 28 as one fluid injection port 26.

  The opening positions of the fluid ejection ports 26 are arranged adjacent to the three fluid ejection ports 15.

A lid 17 covering the upper part of the cartridge housing 21 mounted in the handpiece head 11 is detachably fitted to the upper part of the handpiece head 11, and an inner bottom protrusion of the lid 17 17a is brought into contact with the upper surface of the rotary shaft 23 in the cartridge housing 21, and the coil spring 18 disposed around the rotary shaft 23 on the lower side of the inner bottom of the lid body 17 via the rotary shaft 23 The cartridge housing 21 is biased downward in FIG. 1, that is, so as to be integrated with the handpiece head portion 11.
The pneumatic drive system for rotating the rotor 24 is the same as that known in the art, and a description thereof will be omitted.

  Next, operations and effects of the cartridge-type dental handpiece 1 according to the present embodiment having the above-described configuration will be described mainly with respect to the operations and effects related to the cartridge housing 21.

  In the cartridge-type dental handpiece 1 according to the present embodiment, the cutting tool 31 supplies water from one fluid ejection port 26 in the cartridge housing channel 25 via the one fluid channel 3 and the communication channel 13. Injecting air toward the cutting action surface area, and cutting air from the other fluid injection port 15 of the handpiece head part 11 through the other fluid flow path 4 and the communication flow path 14. It injects towards

  Thereby, according to the cartridge-type dental handpiece 1 according to the present embodiment, water and air are mixed outside the cartridge housing 21 and the handpiece head unit 11, based on a mixing system in the air atmosphere. A constant discharge spray structure that is not affected by the pressure balance of water and air in the handpiece head unit 11 can be obtained. Cooling of heat generated by cutting when the affected part is deleted, and cutting generated by cutting. It is possible to provide a cartridge-type dental handpiece 1 that is effective for removing debris.

  In addition, according to the cartridge-type dental handpiece 1 according to the present embodiment, the cartridge housing 21 includes a cartridge housing that extends from the outer wall portion on the lower end side to the fluid ejection port 26 that opens to the lower end surface 21a. Since the flow path 25 is provided, it is only necessary to form the flow path 28 in the cartridge housing 21 with the recessed groove portion 27 and the three fluid ejection ports 26, and the structure of the cartridge housing 21 is simplified. Compared to the conventional example, the burden on the user can be reduced by reducing the processing cost of the cartridge housing 21.

  Furthermore, according to the cartridge-type dental handpiece 1 according to the present embodiment, the cartridge housing flow path 25 is configured as shown in FIG. 2 when the cartridge housing 21 is detached from the handpiece head portion 11. Since the concave groove portion 27 and the fluid ejection port 26 are exposed to the outside, the fitting member 16 including the other fluid ejection port 15 is also exposed to the outside on the handpiece head portion 11 side. 21 and the maintenance work and cleaning work of the handpiece head part 11 can be simplified.

  FIG. 6 shows another example of the water and air injection mode in the cartridge-type dental handpiece 1 according to the present embodiment. In contrast to the case shown in FIG. Air is ejected from one fluid ejection port 26 in the cartridge housing channel 25 to the cutting action surface region by the cutting tool 31 through the communication channel 13, and the other fluid channel 4 and the communication channel 14. In this manner, water is ejected from the other fluid ejection port 15 of the handpiece head portion 11 toward the cutting action surface area by the cutting tool 31.

  Even when such a usage mode as shown in FIG. 6 is adopted, the same actions and effects as those described above can be exhibited.

  The present invention can be widely applied not only to the above-described air turbine type dental handpiece, but also to various two-fluid jet type dental handpieces that jet water and air to the cutting action surface.

DESCRIPTION OF SYMBOLS 1 Dental handpiece 2 Handpiece head part 3 One fluid flow path 4 The other fluid flow path 11 Hand piece head part 11a Lower end surface 11b Inner peripheral notch recessed part 12 Accommodating area 13 One communication flow path 14 The other communication flow path 15 Other fluid injection port 16 Fitting member 16a Rising part 16b Bottom plate part 17 Cover body 17a Inner bottom protrusion 18 Coil spring 21 Cartridge housing 21a Lower end surface 21b Outer peripheral notch recess 22 Bearing 23 Rotating shaft 24 Rotor 25 Cartridge housing flow path 26 One fluid injection port 27 Concave groove portion 28 Injection flow path 31 Cutting tool

Claims (3)

Water and air are fed from the handpiece main body side by two fluid flow paths, and an accommodation area for the cartridge housing having an inner peripheral side opened at the lower end surface is formed inside. The outlet side of one communication channel communicated with one fluid channel faces the inner wall surface forming the housing region, and the outlet side of the other communication channel communicated with the other fluid channel is the lower side. A handpiece head portion which is the other fluid ejection opening opened in the end surface;
In the receiving area of the handpiece head part, the lower end surface faces the inner side of the lower end surface of the handpiece head part and is detachably mounted, and the cutting tool driven to rotate protrudes from the center part of the lower end face And a cartridge housing comprising a cartridge housing flow path that is detachably held and extends from the outer wall portion corresponding to the outlet side of the one communication flow path to the one fluid ejection port that opens to the lower end surface through the inside.
Have
Either one of water or air from one fluid ejection port in the cartridge housing channel through the one fluid channel and the communication channel, and the other of the handpiece head part through the other fluid channel and the communication channel A cartridge-type dental hand characterized in that either one of water and air is jetted from a fluid jet port of the nozzle toward the cutting working surface area of the cutting tool by a water / air-air mixing method. piece. Water and air are fed from the handpiece main body side by two fluid flow paths, and an accommodation area for the cartridge housing having an inner peripheral side opened at the lower end surface is formed inside. The outlet side of one communication channel communicated with one fluid channel faces the inner wall surface forming the housing region, and the outlet side of the other communication channel communicated with the other fluid channel is the lower side. A handpiece head portion which is the other fluid ejection opening opened in the end surface;
In the receiving area of the handpiece head part, the lower end surface faces the inner side of the lower end surface of the handpiece head part and is detachably mounted, and the cutting tool driven to rotate protrudes from the center part of the lower end face And a cartridge housing comprising a cartridge housing flow path that is detachably held and extends from the outer wall portion corresponding to the outlet side of the one communication flow path to the one fluid ejection port that opens to the lower end surface through the inside.
Have
Water from one fluid ejection port in the cartridge housing channel through the one fluid channel and the communication channel, and air from the other fluid ejection port in the handpiece head portion through the other fluid channel and the communication channel. Is a cartridge-type dental handpiece characterized in that it is jetted toward the cutting surface area of the cutting tool by a water / air-air mixing method. Water and air are fed from the handpiece main body side by two fluid flow paths, and an accommodation area for the cartridge housing having an inner peripheral side opened at the lower end surface is formed inside. The outlet side of one communication channel communicated with one fluid channel faces the inner wall surface forming the housing region, and the outlet side of the other communication channel communicated with the other fluid channel is the lower side. A handpiece head portion which is the other fluid ejection opening opened in the end surface;
In the receiving area of the handpiece head part, the lower end surface faces the inner side of the lower end surface of the handpiece head part and is detachably mounted, and the cutting tool driven to rotate protrudes from the center part of the lower end face And a cartridge housing comprising a cartridge housing flow path that is detachably held and extends from the outer wall portion corresponding to the outlet side of the one communication flow path to the one fluid ejection port that opens to the lower end surface through the inside.
Have
Air from one fluid ejection port in the cartridge housing channel through the one fluid channel and the communication channel, and water from the other fluid ejection port in the handpiece head section through the other fluid channel and the communication channel. Is a cartridge-type dental handpiece characterized in that it is jetted toward the cutting surface area of the cutting tool by a water / air-air mixing method.

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