WO2002026153A2

WO2002026153A2 - Tubeless appliance for dental treatment

Info

Publication number: WO2002026153A2
Application number: PCT/EP2001/011187
Authority: WO
Inventors: Wolfgang Behringer; Kàroly NAGY; Nadjaf Mougoui; Manfred Franetzki
Original assignee: Cdi - Centrum Für Dentale Innovationen Gmbh
Priority date: 2000-09-29
Filing date: 2001-09-27
Publication date: 2002-04-04
Also published as: WO2002026153A3

Abstract

The invention relates to a tubeless appliance for dental treatment, comprising a handpiece which can be coupled to a dental tool, and a supply element. Said supply element comprises an electric energy source for a drive motor for the dental tool and/or a coolant unit and/or a compressed gas unit. The aim of the invention is to facilitate the handling of the handpiece during the treatment of the patient. To this end, the supply element and the handpiece are arranged on the treatment appliance in such a way that tilting moments around the handling area are essentially eliminated during the use of said treatment appliance.

Description

DESCRIPTION

Tubeless dental treatment device

The invention relates to a tubeless dental treatment device which has a handpiece which can be coupled to a dental tool and a supply part, the supply part comprising an electrical energy source for a drive motor for the dental tool and / or a coolant device and / or a compressed gas device.

A dental treatment device of the type mentioned above is known from US Pat. No. 4,445,860, in which the supply part screwed onto the handpiece contains a liquid gas container which continuously delivers drive gas for a drive motor for a dental tool housed in the head of the handpiece. It is difficult for the dentist or nurse to manipulate the handpiece precisely.

From document DE-A-195 20 765 a dental treatment device of the type mentioned is known, in which the supply part connected in one piece with the handpiece contains batteries for driving a motor mounted in the handpiece for the dental tool. The treatment device is voluminous and difficult to control with the desired sensitivity during the treatment of the patient. The handpiece known from the document DE-A-35 07 083 also has the same disadvantage, the rear section of which is coupled to batteries and to a coolant reservoir.

The dental treatment unit known from US Pat. No. 5,286,192 serves only for the removal of tartar and for the external treatment of the teeth and the oral cavity. It includes a handpiece in which a battery-powered compressor for generating compressed air is housed. This handpiece is also relatively cumbersome due to the compressor and the associated batteries. Finally, US Pat. No. 3,109,238 discloses a cordless handpiece with a supply part coupled on the rear, which contains the drive motor for a dental tool and the batteries required for its activation. The handpiece has a blower which supplies cooling air drawn in from the outside to the treatment site on the patient. The supply part is bent transversely relative to the longitudinal axis of the handpiece, a spur gear coupling coupling the output shaft of the drive motor to the drive shaft for the dental tool. When working in the rear area of the oral cavity, the lateral offset of the supply part is a problem. If the dentist grips the supply part by hand, sensitive guidance of the dental tool to and at the treatment site is considerably more difficult. If the dentist grips the handpiece, it is difficult, for example, to drill out root canals. The dental treatment unit known from document US-A-4,173,828 has similar disadvantages.

The invention has for its object to facilitate the handling of the handpiece during the treatment of the patient.

For this purpose, it is provided according to the invention in the treatment device mentioned at the outset that the supply part and handpiece are arranged on the treatment device in such a way that tilting moments around the handling point are essentially eliminated when the treatment device is used. As a result, the fingers of the user of the treatment device are relieved of the weight of the supply part, so that the dental tool can be easily brought to the treatment site and directed in the area thereof without any special effort on the part of the user. Furthermore, a large-volume supply part does not interfere with medical access to the rear part of the oral cavity because its support generally requires a greater distance from the head of the handpiece.

The invention, the preferred embodiments of which are specified in the subclaims, can advantageously be developed in a variety of ways. In one embodiment, the supply part can be axially displaceable with the handpiece be coupled so that the user can fix the supply part on the handpiece so that the supply part rests on the back of the hand. Alternatively, the supply part, which is axially displaceable along the handpiece, can be advanced by the user so far in the direction of the head of the handpiece that the supply part lies in the interior of the hand when in use and is supported there. As a further embodiment of the invention comes into consideration that the supply part is not only pivotable axially, but also transversely to the longitudinal axis of the handpiece, so that the user can easily turn the handpiece without any significant effort around its longitudinal axis, the supply part being in position which rests on the hand of the user. Said mobility of the supply part is preferably made possible in such a way that rail-like guides, which may be cross-shaped, are formed on the housing of the handpiece, in which protruding lugs are guided from the supply part, the handpiece housing having an opening for the passage of electrical connecting cables for a Handpiece accommodated drive motor for the dental tool and / or hoses of coolant storage housed in the supply part for water or gas. It is also advisable to make the front part of the handpiece rotatable or rotatable in relation to its rear part, to which the supply part is connected.

In a further embodiment of the invention, the supply part can have the shape of an inverted U, the base of the U on the handpiece being held, for example, in the manner mentioned, and the legs of the U encompassing the space between the thumb and index finger of the user from the inside and outside. In this form of the supply part, it rests on the bend between the thumb and forefinger.

The controls for the control of the drive motor or for the coolant supply are arranged in one embodiment of the invention on the front part of the handpiece for operation by the first or second middle hand finger; alternatively, at least part of the Operating elements arranged on a supply part housing accessible to the fingers or on a handle protruding therefrom. In a further embodiment of the invention, the supply part is detachably coupled to the rear end of the handpiece via a hose, which comprises electrical cables and supply lines for coolant. The length of the hose is dimensioned such that the supply part can be stored in a pocket of the user's clothing, for example in a pocket of the doctor's coat. The hose is expediently connected to the handpiece via a plug connection. An example of such a connector is described in DE-A-195 20 765.

If, in a further embodiment of the invention, the supply part housing is made of a magnetizable material or has a magnet, a holder with an electromagnet can be provided on a tray on which the unused handpiece can be attached or placed on it the supply part can be held when not in use. This embodiment of the invention is also recommended when the supply part can be plugged into the handpiece, i.e. a hose is not available, in which case the dentist only has to move his working hand, which encompasses the handpiece, to the magnet holder in order to hold the supply part in place, and the handpiece separate from the supply part. The electromagnet is expediently electrically coupled to a foot switch, during the actuation of which the electromagnet is so largely demagnetized that the supply part can be removed from it.

In a further embodiment of the invention, the housing of the supply part is provided with at least one connecting element, which allows the supply part to be temporarily fixed, for example, on the user's forearm. In one embodiment, the connecting element is part of a Velcro fastener, the other part of which is fastened on an elastic band which the user places around his forearm. Another one In the embodiment, the connecting element is a radially elastic clip, the two legs of which can grip around the forearm.

The invention in all of its embodiments explained above has the advantage that the storage for energy, coolant and compressed air can be dimensioned so that its content is sufficient for one or more treatments or treatment files of one or more patients, with the resulting size and Weight of the supply part no longer needs to be taken into account.

According to the invention, all media and the energy source are connected to the handpiece in an ergonomically good and functionally practical manner. The basic principle is the shifting of the necessary weight and volume to parts of the hand or arm of the user, where he feels nothing or much less of the weight and volume of the supply part, in particular he does not have to compensate for any tilting moments. Above all, the tilting moment becomes otherwise Supply part located at the back of the handpiece is drastically reduced. This is done in the following way:

I The weight and volume are not only held between the thumb and index finger, but the handpiece is designed so that part of the weight also rests on the back of the hand. In order to ensure good handling of the handpiece, the handpiece can be connected to the supply part such that it can be moved and rotated or tilted.

II Like I, but part of the weight and volume is transferred to the hand. Control elements can also be attached to this part, e.g. the starter for the engine.

III The hand-held handpiece contains only motor and gear. A short hose connects it to the supply part on the forearm, which contains the other elements. Coupling devices for the arm and / or treatment station or couplings between the handpiece and armpiece are provided for changing the handpiece. IV As III, but the handpiece contains only a part of the gear. A flexible shaft leads to the supply part on the arm, which also contains the motor and possibly another gear part.

V For all embodiments of the invention it is advantageous that with as little water and without air, i.e. without cooling the conventional spray. This possibility is described in detail in document EP-A-547468.

Different embodiments are possible for the individual components. With a view to cooling that is as versatile as possible and adapted to the respective requirements, water is used as usual.

With regard to a particularly effective cooling device, an advantageous embodiment of the invention provides that the water reservoir has a cylinder with a displaceable piston or a displaceable membrane. In another embodiment, the water reservoir is designed as a bellows, which brings structural advantages. In an alternative embodiment of the invention, the water reservoir has a container with a flexible wall, which is designed, for example, as a flexible sack. Such a memory adapts itself to the outer contours of the supply part and collapses when empty. The space available in the supply section can thus be optimally filled.

The mentioned configurations of the memory are suitable on the one hand for an embodiment of the handpiece in which the coolant is required by means of a delivery device, for example a pump, and on the other hand for an embodiment in which the coolant is released, for example via a valve, as required. In the first case, the coolant only has to be stored in the memory. In the second case, it is necessary to pressurize the coolant. In one embodiment, a particularly simple pressurization provides a spring. If the reservoir containing the coolant, for example air, is pressurized in the manner mentioned, the Compressed air can also be used to blow free the cavity or drill to be machined on the patient. In addition, the compressed air can be used to cool the drive motor, the treatment site or to remove precipitation on optical components.

All gases are suitable as coolants which, at a pressure of up to about 100 bar, can easily be kept in liquid form in smaller containers of, for example, a few 10 ml at room temperature and are gaseous at 1 bar and room temperature. From an ecological point of view, tetrafluoroethane (Frialin 134a), laughing gas or CO _{2 come} into consideration here. CO ₂ is easy to handle, inexpensive and usually already available in the dental practice. The cooling medium has three functions: to cool the drilling site, to remove abrasion, especially from the drilling tool itself (to avoid clogging), and to keep the non-abrasive parts of the drill on the tooth low (lubricate). These three functions can only be achieved with liquid cooling medium. Therefore, the medium must reach the drill in a liquid state.

This is achieved according to the invention in that the cooling medium is liquid until immediately before it exits the supply line provided in the handpiece, that is to say is under sufficient pressure there, and exits at the exit point as a liquid jet which is directed toward the drilling point. The beam evaporates after impacting the drilling site. It fulfills the three functions mentioned above. By evaporating on the drill, it cools and also cleans it particularly well.

These functions are realized in that after a possible pressure reduction by a pressure regulator to a pressure that still holds the medium, the cooling medium reaches a correspondingly thin and elongated outlet opening (of a few tenths of a millimeter opening cross-section). This is located at the smallest possible distance from the drilling site. By means of a temperature measurement, for example using an infrared probe, the cooling The amount of medium is controlled in such a way that on the one hand the tooth and the drill are not too cold, so that too much coolant is not supplied, and on the other hand the tooth is not too hot (overcooked), that is to say not too little coolant is provided. The infrared probe is expediently installed in the head of the handpiece and receives the infrared signals (heat radiation) from the drilling area with suitable optics, namely from the immediate vicinity of the drilling point. An alternative is to measure the temperature of the drill, which can be done either optically by infrared scanning or by thermocouple or thermistor. This is the first time that drilling temperature monitoring has been created. Such a temperature monitoring is not possible with the water cooling that has been practiced to date, because the aerosol mist scatters and absorbs the infrared, so the probe cannot look at the drilling site.

With regard to a particularly simple supply of the functional elements with operating media, in particular coolant, the handpiece in a preferred embodiment of the invention has a coupling device for filling the memory and / or the functional elements with operating media and / or for charging a memory for electrical energy. Such filling or loading can be carried out in parallel or sequentially by one and the same coupling device.

Alternatively, it is provided that the supply part has a separate coupling for filling the storage and / or the functional elements with operating media and / or for loading a storage for electrical energy. In a particularly practical manner, the coupling is designed for coupling the supply part to the transmission and / or to the motor. The coupling is particularly advantageously designed as a universal coupling which, on the one hand, allows the functional elements to be filled or loaded and, on the other hand, allows them to be connected to the transmission and / or the motor.

In a preferred embodiment of the invention, a battery, an accumulator, a capacitor or a comes for the storage for electrical energy Fuel cell into consideration. In a further preferred embodiment of the invention, a receiver for remote control is built into the handpiece, with which the electronic and pneumatic control elements in the handpiece and / or supply part can be wirelessly controlled, for example from a foot switch for the dentist.

There are several options for reloading or refilling the functional elements of the tubeless han piece. Reloading or refilling can take place at the treatment center and on the dentist's device, on the assistant's element or on a tray on an existing coupling. A separate device can be provided for refilling or reloading the memory and / or the functional elements. This is preferably set up near the treatment center. With a charging or refill option at the treatment center, it is possible to always charge the handpiece when not in use or during treatment breaks, i.e. to store it in the charging state, or to do this only when there is a need to refill or recharge.

Between the treatment of different patients, the handpiece has to be serviced, lubricated, cleaned and sterilized in the usual way and possibly topped up or charged. For this purpose, a refill and / or recharge device is provided, which is also designed for cleaning and / or for disinfecting and / or sterilizing the handpiece or the gear and / or the supply part. In a separate device, nozzles are arranged in or onto which the motors designed as intermediate members can be plugged in or plugged. After treatment of the gear unit, the supply part and, if necessary, the intermediate link, the individual components can be removed, put together and put ready for use on a tray, optionally in a holder. This means that the handpiece is properly prepared and quickly available. With regard to the operation of the handpieces, control elements, push buttons, capacitive or optical elements can be built into the handpiece in a preferred embodiment of the invention. Furthermore, it can preferably be operated via a voice input or via a remote control from a control panel, for example at the treatment station. The remote control is particularly advantageously triggered via one or more foot pedals. Furthermore, position detection can also be provided with respect to the handpiece, via which the handpiece is controlled.

It is advisable to control the speed of the dental tool as usual using the pedal and to preselect all other functions such as the direction of rotation, cooling and lighting with controls on the handpiece.

The following components can be accommodated in an exemplary embodiment of a tubeless drilling handpiece:

Drill head with different ratios and drill thicknesses, with collet, light window, coolant and air outlet, gearbox with different ratios / gear ratios and drilling directions, possibly with lamps, electric motor, possibly with lamps, coupling between motor and gearbox, storage for electrical energy, e.g. accumulator (e.g. lithium-ion battery or nickel-carbon battery) or capacitor or fuel cell, storage for coolant, air storage, control electronics for engine, fluidics and remote control, fluidic actuators for metering coolant and air, operating elements, coupling elements to a charging station for electricity, Coolant and air, combined coupling for coupling the gearbox and coupling piece and for loading or refilling operating media and coupling between coupling piece and engine.

The invention is described below with reference to the embodiments shown in the accompanying drawings. Show it: 1: a schematic perspective view from above of a treatment device according to a first embodiment;

2 shows a schematic perspective view from below of the treatment device according to FIG. 1;

3 shows a schematic perspective view according to FIG. 2 after removal of the supply part housing;

4: a schematic perspective view from above of the treatment device according to FIG. 1 after removal of the supply part housing;

5: a schematic perspective side view of a further embodiment of a treatment device;

6: a view similar to FIG. 3 of the treatment device according to FIG. 5 after removal of the supply part housing;

7: a schematic side view of a third embodiment of a treatment device;

8: a schematic perspective view of a treatment device placed on the tray of a treatment station;

9 shows a representation similar to FIG. 8 of another embodiment of a tray;

FIG. 10 shows an illustration explaining the handling of a treatment device; FIG.

11 shows a schematic perspective illustration of a further embodiment of the supply part of a treatment device; Fig. 12 is a schematic representation of the head part of another treatment device.

The dental treatment device 30 shown in FIGS. 1 to 4 is composed of a handpiece 32 and a supply part 36, which is detachably connected to the rear part 33 of the handpiece 32 via coupling members. At the front, the handpiece 32 has a head 31 into which a dental tool such as a drill 5 can be inserted.

The supply part 36 contains a plurality of stores, specifically a store for electrical energy in the form of two cells 35, 37 charged with batteries, a store 38 for coolants, for example pressurized water, and a cartridge 34 which contains a pressurized gas, for example compressed air. The cells 35, 37, the memory 38 and the cartridge 34 are fastened along the side edges to the underside 29 of an approximately triangular circuit board 39, on the top 28 of which the electronic control of the treatment device 30, which is not shown, is also accommodated. The board 39 has a central through opening 26 of such a size that the rear part 33 of the handpiece 32 can extend through it at a flat angle of approximately 30 ° to the board plane. The memory 38 is provided with a corresponding opening 27 for the passage of the handpiece 32.

From the essentially cylindrical rear part 33 protrude two radially opposite hollow pins 22, 24, on which the plate 39 is rotatably mounted about the common axis of the hollow pins 22, 24, this axis extending essentially transversely to the longitudinal axis of the handpiece 32. A drive motor for the dental tool 5 is accommodated in the rear part 33. It receives its drive energy from the cells 35, 37 via electrical lines that pass through the hollow pins 22, 24. The mounting of the hollow pins 22, 24 on the board 39 is carried out in such a way that the supply part 36 can also be moved along the rear part in addition to the pivotability mentioned. Otherwise, the front part 23 of the handpiece 32 is connected to the rear part 33 via a swivel joint indicated at 25, which can also be designed as a swivel plug joint. The front part 23 encloses a gear mechanism, which is coupled to the output shaft of the motor by the swivel joint 25, for driving the dental tool 5.

As FIGS. 1 and 2 show, the circuit board 39, with the components attached to it, encloses a supply part housing 21, which is sealed at the rear with an elastic seal 19 against the rear part 33. It can be seen that the handpiece 32 passes through the supply part 36 at the above-mentioned angle from top to bottom. The handling point 20 is close to the supply part housing 21. The weights in the latter and in the handpiece 32 are distributed in such a way that there is no tilting moment with respect to the handling point 20 that the user would have to compensate for. Nevertheless, depending on the requirements in the course of a patient treatment, the user can change the inclination of the supply part 36 to the handpiece 32, the position of the supply part 36 along the rear part 33 and the rotational position of the front part 23 as desired. He can also choose this change so that the supply part 36 is supported on the back of his hand. This can also be done by a light spring in the supply part or its own weight.

In the embodiment of the treatment device 50 according to the invention shown in FIGS. 5 and 6, the supply part 56 has a different arrangement of its components and a different shape of the supply part housing 41. First, there are water containers 58 and electrical energy cells 55, 57 on both sides of the rear part 53 of the handpiece 52 and in each case directed rearward downward on a board 59 which is essentially transverse to the rear part 53. Furthermore, a rear end plate 47 is fastened to the rear side of the board 59 via spacer bars 44, 45. This creates an intermediate space between the circuit board 59 and the end plate 47, in which electronic and possibly also fluidic components can be accommodated. On the end piece protruding rearward over the end plate 47 of the rear part 53, a coupling piece 54 is provided, the meaning of which will be discussed below. Otherwise, there is mobility of the front part 43 relative to the rear part 53 of the handpiece 52 and mobility of the supply part 56 relative to the rear part 53 in the same manner as has been described in connection with the exemplary embodiment according to FIGS. 1 to 4. In contrast, the shape of the supply part housing 41 directed backwards and downwards from the rear part 53 is easier to support on the back of the hand of the user, the handling point 40 being located directly in front of the supply part housing 41.

FIG. 7 shows a variant of the exemplary embodiment described with reference to FIGS. 1 to 4, in which a handle 46 extends from the supply part housing 51, on which operating elements, not shown, such as switches or other actuators, are arranged in the access area of the user's fingertips. In addition, the handle 46 can also serve to move the supply part housing relative to the rear part.

FIG. 8 schematically shows a tray 92 as an essential part of a treatment station, which has on one side 91 with a receptacle 94 for a treatment device, for example the treatment device 50. The user can simply insert the treatment device into the bowl-shaped receptacle 94 as shown. To charge the batteries contained in the cells 35, 37 overnight, an electrical connecting cable 93 is fastened to an upright rod 95 fastened to the tray 92 and laterally resilient, the plug of which can be inserted at the free end into a socket provided on the supply part. Furthermore, an upright coupling counterpart 96 is attached to the tray 92, which is connected to a pressurized gas source, not shown, and to a pressurized water source. A gas and water pipe each open in the coupling counterpart 96. During treatment breaks, the user can place the treatment device 50 with its coupling piece 54 on the coupling counterpart 96, so that the memory for compressed gas and coolant in the supply part 56 can be recharged.

In the further embodiment of a dental treatment device 60 shown in FIG. 10, a U-shaped supply part with a front leg 68, a rear leg 66 and a base part 65 is coupled to the end facing away from the head 61 of a handpiece 62, the rear leg 66 Storage for water and air and the front leg 68 contains a storage for electrical energy (batteries). The supply part 65, 66, 68 is connected at its base part 65 to the handpiece 62, care being taken for suitable bushings for hoses for the flowable media contained in the rear leg 66 and for the electrical connections to the batteries in the front leg 68. An essential aspect of this embodiment of the supply part is that the supply part 65, 66, 68 is supported in the bend between the index finger and thumb of the user's hand gripping the handpiece 62, the front leg 68 of the supply part inside the hand and the rear leg 66 of the supply part lies on the ball of the thumb. A plurality of operating elements 63, 67 protrude from the front housing section of the front leg 68 and can be operated comfortably by the ring finger R and / or the little finger K of the hand gripping the handpiece 62. It is understood that in this embodiment of the treatment device 60, the supply part 65, 66, 68 is displaceable along the handpiece 62 and the handpiece 62 is rotatable relative to the supply part 65, 66, 68 about the longitudinal axis of the handpiece 62. The embodiment of the treatment device 60 explained above and shown in FIG. 10 can be modified in such a way that the supply part consists only of the leg 68, the base part 65 and the rear leg 66 are therefore omitted. Then the supply part 68 contains all the memories for the said operating resources as well as the operating elements 63, 67 and is completely taken up by the user's palm with regard to its weight and volume. The handpiece 62 can therefore also be light in this case rotated relative to the supply part 68 and otherwise manipulated in the required manner by the hand of the dentist.

For storing a treatment device 50 that is not used, the tray 72 attached to a support tube 73 according to FIG. 9 is provided at a treatment place, from whose one end face 71 a retaining bar 74 protrudes. In the example shown, the holding bar 74 is provided with three receiving bays 75, 76, 77, into each of which a handpiece 52 can be inserted. The housing 57 of the supply part 56 either consists of a magnetizable material or, if it consists of a preferred plastic, it is provided with a permanent magnet (not shown) on its top. Extending from the tray is an angularly bent, essentially upright holding tube 78, the free end 79, which rises above the level of the tray 72, carries three electromagnets 81, 82, 83 which are exposed downwards. Each electromagnet is via the holding tube 78 and the support tube 73, each with an associated foot switch in electrical connection, which is in the associated power supply circuit for one of the electromagnets. The electromagnet 81, 82, 83 assigned to the actuated foot switch can be temporarily de-energized by operating a foot switch.

When a treatment device that is temporarily or no longer used is stored, the dentist brings the magnetic part of the supply part 56 under one of the electromagnets 81, 82, 83 with the hand that grips the handpiece 52, with the result that the supply part 56 is attached to one of these magnets is. The dentist then pulls the handpiece 52 from the supply part 56 with the same hand and hangs the handpiece in one of the receptacles 75, 76, 77. It is assumed here that the second supply part 58 is integrated into the first supply part 56.

If the treatment device 50 is to be used again, the dentist's hand grips the handpiece 52 held ready in one of the receptacles 75, 76, 77, attaches it to the supply part 56 located under one of the electromagnets 81, 82, 83 and excites it associated electromagnet by depressing the foot switch assigned to it. The complete treatment device can then be removed.

The embodiment of a dental treatment device 80 shown in FIG. 11 has a handpiece 84 and a supply part 86, which are detachably connected to one another by a hose 85. For this purpose, the hose 85 has at its end facing away from the supply part 86 a coupling piece 89 which can be coupled to a coupling counterpart, not shown in detail, at the end facing away from the head 87 of the handpiece 84. When using the treatment unit 80, as shown, the hand H of the user grips the handpiece 84 in the vicinity of his head 87. The forearm UA of the user is wrapped in a non-slip manner by a sleeve 88, which on its upper side is covered with a not-shown, Velcro extending in the longitudinal direction of the forearm UA, for example, is provided. Another Velcro strip (not shown) is attached to the outside of the housing of the supply part 86 at the bottom. If, as explained above, the supply part 86 is held on one of the electromagnets 81, 82, 83, in order to remove the supply part 86, the user must make the Velcro fastener between the supply part 86 and the cuff 88 and deactivate the associated electromagnet by actuating a foot switch. The supply part can then be easily removed from the holder 79.

The treatment device according to FIG. 12 has a drill head 105, from the free annular end face 102 of which, in the example shown, three outflow openings 104, 106, 108 protrude in the form of nozzles with an opening cross section of a few tenths of a millimeter. In the center of the drill head 105 there is a receptacle 103 for a dental tool 107, which is a drill here. A drive motor (not shown) for the dental tool 107 is accommodated in the drill head 105 or in the rear parts of the handpiece. Radially inside the drain openings 104, 106, 108, an annular optic 109 is installed in the drill head 105, which is connected to electronics housed inside the drill head. Electronics and optics 109 are designed so that they from the drilling site 110 on the tooth 120 absorbs heat radiation, evaluates it and controls the amount of liquid coolant, in this case CO ₂ , emitted through the outflow openings 104, 106, 108 according to predetermined parameters as explained at the beginning. The coolant cones discharged from the outflow openings 104, 106, 108 are designated 111, 112, 113, which are directed towards the lower part of the dental tool 107, cool it, clean it and cool the drilling site as evaporating CO ₂ .

Claims

EXPECTATIONS

1. Tubeless dental treatment device (30, 50, 60, 80), which has a handpiece (32, 52, 62, 84) that can be coupled with a dental tool and a supply part (36, 56, 66, 68, 65), the supply part comprises an electrical energy source (35, 37; 55, 57) for a drive motor for the dental tool (5) and / or a cooling medium device (38; 58) and / or a compressed gas device, characterized in that the supply part and handpiece are arranged on the treatment device in this way that when the treatment device is used, tilting moments around the handling point (20; 40) are essentially eliminated.

2. Treatment device according to claim 1, characterized in that the supply part is movable relative to the handpiece.

3. Treatment device according to claim 2, characterized in that a rotary or rotary plug connection is provided between the supply part and the handpiece.

4. Treatment device according to one of the preceding claims, characterized in that the supply part can be tilted relative to the handpiece.

5. Treatment device according to one of the preceding claims, characterized in that the supply part has a portable electrical energy source which can be connected to the handpiece via an electrical cable.

6. Treatment device according to one of the preceding claims, characterized in that the handpiece with an electrical cable with a treatment station, in particular with an existing at the treatment station Luminaire can be connected.

7. Treatment device according spoke 6, characterized in that the electrical cable is preferably connected to a holding arm provided at the treatment site in the form of a resilient rod.

8. Treatment device according to one of the preceding claims, characterized in that at least one quick-charging connector for air and water and / or propellant gas and / or electrical energy is provided at a treatment place, soften the treatment device can be plugged on.

9. Treatment device according to one of the preceding claims, characterized in that the compressed gas is a liquid gas, for example carbon dioxide.

10. Treatment device according to one of the preceding claims, characterized in that the coolant is a liquid gas, for example carbon dioxide, which evaporates at room temperature and ambient pressure.

11. Treatment device according to one of the preceding claims, characterized in that a gas-tight envelope is provided around at least part of the components contained in the supply part, in which air or liquid gas can be stored under pressure.

12. Treatment device according spoke 11, characterized in that the pressure is selected such that it expels the coolant from the coolant device.

13. Treatment device according to one of the preceding claims, characterized in that the housing (57) of the supply part (56) consists of a magnetizable material or has a magnet, and that a holder (79) is provided on a tray (72), which an electromagnet (81, 82, 83), which can be optionally activated and deactivated.

14. Treatment device according to one of the preceding claims, characterized in that the handpiece and / or the supply part houses a transceiver such that the functional elements

(Drive motor, valves) can be controlled wirelessly via one or more foot switches.

15. Treatment device according to one of the preceding claims, characterized in that the supply part is axially displaceably coupled to the handpiece.

16. Treatment device according to one of the preceding claims, characterized in that on the housing of the handpiece, cross-shaped rail-like guides are optionally formed, in which from the

Supply part protruding lugs are guided, wherein the handpiece housing has an opening for the passage of electrical connection cables for a drive motor accommodated in the handpiece for the dental tool and / or hoses of coolant stores for gas or water accommodated in the supply part.

17. Treatment device according to one of the preceding claims, characterized in that the supply part has the shape of an inverted U.

18. Treatment device according to one of the preceding claims, characterized in that controls for the handpiece are arranged on a supply part housing.

19. Treatment device according to one of the preceding claims, characterized in that the supply part housing consists at least partially of a magnetizable material or at least one magnet having.

20. Treatment device according spoke 19, characterized in that the magnet is an electromagnet which is electrically coupled to a foot switch.

21. Treatment device according to one of the preceding claims, characterized in that the supply part is provided with a connecting element, for example a Velcro fastener tape, for fixing it to a body part, preferably the forearm of the user.

22. Treatment device in particular according to one of the preceding claims, in which a handpiece that can be coupled to a dental tool and a supply part are provided, the supply part comprising an energy source for a drive motor for the dental tool and a coolant device and / or a compressed gas device, characterized in that the Coolant device holds a liquefied gas such as CO ₂ stored under pressure, which evaporates at room temperature and ambient pressure.

23. Treatment device according spoke 22, characterized in that the

Handpiece has at least one outflow opening (104, 106, 108) of a pressure line for the liquid gas.

24. Treatment device according spoke 22 or 23, characterized in that a temperature measuring device (109) is provided on the handpiece, which the temperature of the drilling object (tooth 120) in the vicinity of the processing point (110) or that of the dental tool (107) on the Processing location allowed to be recorded.

25. Treatment device according to claim 24, characterized in that the

Temperature measuring device consisting of at least one infrared receiver Optics (109) with downstream electronics.

26. Treatment device according to one of claims 24 or 25, characterized in that the temperature measuring device controls the liquid gas stream leaving the hand-held device as a function of the detected temperature, for example by means of control valves.