CN1867300B - Dental handpiece with a body formed from a single piece and comprising an electronic and elastic element for connection between the mechanical transmission elements and the head of the instrument - Google Patents

Abstract

The invention relates to a dental handpiece (1) comprising mechanical elements, i.e. a tool holder unit for fixing and rotationally driving a dental instrument about a drive axis (6) and a movement transmission unit. The mechanical elements are mounted inside the body (2) with a head (4) and a handle (3). The invention is characterized in that it comprises means for electric connection between the mechanical elements of the handle and the head of the instrument. Said means are made up of an elastic and electrically conducting connecting element.

Description

Dental handpieces having a one-piece body - having elastic electrical connection means between the mechanical transmission means of the instrument and its head

technical field

The present invention relates to a new type of dental handpiece.

Background technique

There are two types of generally known dental handpieces, straight handpieces and contre-angle handpieces.

In the case of an elbow-type handpiece, the body consists of a handle with a crank and a head.

This construction leads to an embodiment that requires at least two, often three, parts for the body so that the internals can be fitted together, and that also requires multiple, at least three, bearings.

Obviously, this design cannot make the cost much lower.

Contents of the invention

The invention is firstly aimed at proposing a new constructional concept for handpieces, which can replace the current concept of handpieces and which, for mechanically driven handpieces or gas turbine driven handpieces, allows the main body to be implemented in a single piece .

This object is achieved by the present invention, wherein the invention proposes a dental handpiece having a mechanical mechanism comprising a gripper assembly and a chain of mechanical transmission elements for rotational movement, wherein the gripper assembly is For fixing and driving a dental instrument around a drive shaft, the mechanical parts are installed inside a main body having a head and a handle, characterized in that the main body consists of a single piece, namely an electrically insulating casing Formed, one part of which serves as the handle and the other part constitutes a head having a first lumen communicating with at least one opening sized to allow the The mechanism of the head is inserted and assembled therein, the handle has a second longitudinal cavity with a straight axis leading to the end of the handle through an opening on the one hand, and to the end of the handle on the other hand One side of the opening leads to the first inner cavity, and the opening is dimensioned so that the internal mechanism of the handle is inserted and fitted therein; in the handle, the current flows from a connection socket with a motor conducts; in said head a gear with a handle rod mounted on the drive shaft has teeth that mesh with the teeth of an output gear of the handle, the handle rod The gears are electrically conductive, which ensures the electrical connection and mechanical drive to the instrument.

According to a variant, the handpiece has an electrical connection consisting of a chain of mechanical transmission elements of rotational movement, ensuring the transmission of electrical energy and motion from a wire arranged at the end of the handle in order to ensure the transmission of electrical energy and movement to the instrument. An external motor cooperates.

According to another variant, it has an electrical connection formed by a wire.

According to another variant, it has an elastic connection means for ensuring the electrical connection between the mechanical transmission means and the appliance head.

According to another variant, the head is equipped with a turbine and the body of the handpiece has the fluid channels required for the work.

Preferably, the lumen of the head is adapted to receive a clamp assembly consisting of the mechanical transmission parts of the head, and to receive a fastening-loosening part of an implement or instrument, said lumen being communicated through an opening. To the head, the opening can be closed by a plug or a cover or by a push button switch.

Preferably, the handpiece has a fastening device for fastening a dental instrument to a clamp assembly for the fixation and rotational drive of a dental appliance or instrument about a drive shaft, said clamp assembly being integrated in a dental On a head of the handpiece, and connected with a transmission assembly integrated in a handle of the handpiece, and mainly composed of elastic and deformable fastening-releasing parts in the form of a strip, the At least a part of the fastening-releasing member has a section suitable for engaging in a neck or an annular groove arranged on the upper part of the instrument and adapted to hold the instrument by fastening the instrument, said fastening - The release element also has means for applying a release force in order to cancel the fastening force and thereby release the instrument.

Preferably, said fixing means is detachable relative to the clamp.

According to a variant, the strip of deformable and elastic material has a substantially parallelogram shape with a central area provided for fastening the head of the instrument at a groove.

According to another variant, the deformable and elastic strip has the shape of a split ring or a split ring jaw with an annular shoulder adapted to engage on the An annular neck and having a tapered portion for mating with a tapered complementary portion of a push button switch.

Depending on the operating and/or working speed variant of the appliance, the fastening device can have a push button switch, which is connected or not to the clamp and which can be held, for example by clamping, in an opening in the head.

Description of drawings

The invention will be better understood with reference to the following non-limiting description taken in conjunction with the accompanying drawings. The accompanying drawings are as follows:

Figure 1 is a three-dimensional general view of a handpiece according to the invention;

Fig. 2 is a longitudinal sectional view of the handpiece shown in Fig. 1;

Figure 3 is a partial longitudinal sectional view of a non-limiting embodiment of the present invention;

Figure 4 is a partial perspective view of another non-limiting embodiment having a manually releasable fastening-releasing member in the form of a diamond-shaped elastic band;

Fig. 5 is an axial sectional view of Fig. 4;

Figure 6 is a partial transverse sectional view of the head shown in Figure 4 which is implemented at the elastic band;

Fig. 7 is a partial sectional perspective view of the head shown in Fig. 4;

Figure 8 is an axial sectional view of another non-limiting embodiment having a fastening-releasing member in the form of an elastic band which can be released by the action of a button;

Fig. 9 is a partial sectional perspective view of the embodiment shown in Fig. 8;

Figure 10 is a perspective view of the elastic band shown in Figures 8 and 9;

Figure 11 is an axial sectional view of another non-limiting embodiment having a fastening-loosening member in the shape of a split ring;

Figures 12 and 13 are perspective views of the push button switch shown in Figure 11;

Figures 14 and 15 are perspective views of the fastening-loosening element shown in Figure 11 in the form of a split ring-jaw;

Fig. 16 is a perspective view of the button switch shown in Fig. 3;

FIG. 17 shows a variant of the embodiment shown in FIG. 3 with an elastic conductive connection means.

Detailed ways

General Concepts of the Handpiece Body

Reference is first made to the non-limiting examples shown in FIGS. 1 to 3 .

The handpiece 1 according to the invention consists of a one-piece body 2 comprising a part serving as a handle 3 and a part forming a head 4, said handle 3 having a straight axis, said head 4 being used for For securing and driving an instrument 5 along a drive shaft 6, said drive shaft 6 may be aligned with the shaft 7 of the handle, or may form a predetermined angle therewith, the angle being between 90° and 180°, and preferably between Between 100° and 130°, as shown in the non-limiting examples shown in the accompanying drawings.

The body is formed by an integral or non-integral housing or shell 8, which may be electrically insulating and may be made, for example, of a thermoplastic or thermosetting polymer material, preferably polyether-etherketone (hereinafter abbreviated as PEEK) , which houses the mechanical assembly of the handle and the head, as well as electrical connections, thereby ensuring the transmission of electrical energy and movement from the wire 9 to the instrument 5 fixed on the head 4, wherein said wire 9 is arranged at the end of the handle for use in Cooperate with an external motor (not shown).

The elbow piece 1 according to the invention shown in FIGS. 1 to 3 has two shafts 6 and 7 which limit the risk of friction in each bearing and which in this way ensure as stable an efficiency as possible, therefore, in this case Down, ball bearings are also housed in the housing 8. This arrangement of the elbow piece is particularly suitable for endodontics (medicine) with apex detectors.

Thus, a handpiece according to the invention coupled to a motor can thus, for example, rotate an instrument 5 (for example a trough instrument) and can thereby even transmit current with which peak detection can be performed. The electrical connection between the motor and the handpiece (see Figures 2 and 3) can be made by any connection between a connecting finger of the motor and a connecting neck 10 of a socket 11 (or for example by telescoping buttons) . The insulating housing 8 is held by the dentist, and its end on the head 4 side is surrounded by the patient's mouth. In this configuration, the chain of mechanical and electrical transmission parts is constituted in the handle as follows: the current passes from the socket 11 to an outer collar of a first bearing 12, and to a first spring 13, which in turn passes to An outer fixed collar of a second bearing 14, then passes to a collar 15 axially locked by a first shoulder on the housing 8, and then to a second shoulder axially locked by a second shoulder of the housing 8. A spring 16 to lock.

The first and second bearings 12 , 14 support a drive shaft along the longitudinal axis 7 of the handle, ie the first axis of the handpiece 1 , and the springs 13 and 16 are compression springs whose coils are arranged externally on the drive shaft 7 .

At this stage, the current is thus passed through the elbow piece, ie the handle of the handpiece 1 .

As a variant, a lead is conceivable, which leads out from the motor-side end until it makes contact with the instrument or implement 5 .

The head 4 of the elbow has its second shaft, the drive shaft 6, which supports two ball bearings (in inclined contact if possible), namely an upper bearing 17 and a lower bearing 18, the outer sleeve of which upper bearing 17 The ring cooperates with the second spring 16 of the shank, and the axial play of said lower bearing 18 is eliminated by means of an elastic washer 19 .

Due to this mounting of the bearing, the balls of the bearing are always in contact with the inner and outer rings of the bearing, thus ensuring the electrical connection between the fixed part and the moving part.

A gear with a shank mounted on the drive shaft 6 ( ) 20 has teeth 21 which mesh with teeth 22 of an output gear 23 of the handle.

The shafted gear 20 is electrically conductive and is connected to the inner collar of the bearing, which ensures the power supply to the instrument 5 and its mechanical drive. In view of the external insulation of the housing 8 and a push button switch 55 (which will be described later) arranged on the head 4, the current delivered to the end of the instrument defines a peak value by a resistance change effect.

As a variant, the electrical connection between the second bearing 14 and the instrument head 40 is ensured by an elastic and electrically conductive connecting member 88 , and the mechanical drive of the instrument is ensured by a gear 20 with a handle, as previously described.

The connecting member 88 is for example a thin plate or a rod with a circular or rectangular cross-section and has a first peripheral portion 89 and a second peripheral portion 91, wherein the first peripheral portion engages in a In the groove 90 in the bearing 14 collar 15, and the second peripheral part is located on the end opposite to the first peripheral part, it is supported on the instrument head 40, and the connecting mechanism is when the push button switch is not working. It is held perpendicular to the axis of the instrument by means of the groove 90 .

This variant is particularly advantageous, on the one hand because pressing the push button switch 55 pushes the instrument head 40, and on the other hand because the contact of the connecting element on the head 40 is centered on the axis of the instrument by means of the spherical surface of said head. Therefore, the friction velocity is close to zero.

Fixture and fastening-loosening concept for instruments in the head

A non-limiting preferred embodiment of the means for securing the instrument in the head 4 and the means for fastening and loosening the instrument will now be described.

Accessibility to molars is a guarantee of comfort and quality for dentists and patients, for example in endodontics. Therefore, the applicant intends to propose a clamp assembly 24, which is composed of head mechanical transmission parts, and has as small a volume and a compact structure as possible.

It achieves its purpose by designing the following components:

- a new type of fastening-loosening element 25 with a compact structure and low volume, which is an integral part of a fixed assembly and consists of an elastic and deformable strip made of plastic (eg PEEK) or non-plastic 25 components, separately ensuring the tightening and loosening functions, the loosening is performed by a manual centripetal action on the strip, and the tightening is performed by releasing this action,

- a lumen 26 in the head, adapted to receive the clamp assembly 24 and its fastening-loosening element 25, said lumen leading to the head through an opening 27 which can be formed by a plug or a The cover 28 is either closed by a push button switch.

The solution can be better understood by reading the following two examples.

First, a first embodiment shown in Figures 4 to 7 is described, in which the release is controlled by a direct manual action on the band.

Along the inner chamber 26 of the clamp assembly 24 there is on the one hand a cylindrical lower part 29 coaxial with the drive shaft 6 and having a diameter adapted to receive the stem 30 of the gear 20 with the stem, and the other Aspects have a substantially cylindrical upper part 31 also coaxial with the drive shaft 6, said upper part having a larger diameter, for receiving the toothing 21 of the gear with the handle rod of the instrument linkage and the following will be described Fastening-loosening device.

The open opening 27 of the upper part 31 of the inner chamber is closed by a plug or cover 28 which is preferably but not necessarily made of the same material as the housing 8 .

The inner chamber upper part 31 also has a side opening 32 which leads into an inner chamber 33 of the handle 3 so that the toothing of the shaft gear 20 with the handle 20 meshes with the toothing of the output gear 23 of the handle 3 .

The gear with the shank rotates freely in the head and its axial stability is ensured on the one hand between the bottom 34 of the upper part of the cavity forming a shoulder and on the other hand the front face 35 of the plug. The axial degree of freedom created by the gear with the shank is a few hundredths of a millimeter.

The rotational movement of the output gear 23 is transmitted to the gear 20 with a handle and then to the instrument 5 by means of a flat part 36 arranged on the instrument, said flat part 36 being arranged in the inner hole 38 of the gear with a handle. A flat piece 37 cooperates.

According to this embodiment shown in FIGS. 4 to 7, the fastening-loosening element consists essentially of a strip 25 made of a deformable and elastic material substantially rhomboid in shape and There is a central region 39 for fastening the head 40 of the instrument at an annular locking groove 41 arranged at the upper end of the instrument.

The large diagonal of the rhomboid is arranged such that its two ends diametrically exceed the housing of the head 4 through two protrusions 42, said each protrusion 42 being arranged in a groove 43 of the head, each A groove 43 leads on the one hand to the upper part 31 of the inner cavity and on the other hand to the opening 27 for receiving the plug.

Simultaneously performing a direct manual centripetal action on both lugs 42 loosens the instrument and releasing said action ensures the fastening of said instrument.

The groove profile 44 ensures the rotational locking of the strip, which is centered in the head by a recess 45 which is arranged in the vicinity of the protrusion 42 and rests against the inner cavity 26 On the periphery 46 of the upper part.

The axial stability of the strip is ensured on the one hand by a shoulder 47 which is arranged on a side of the plug for receiving the instrument head 40 and on the other hand by the bottom 50 of the groove. The bottom 48 of the axial chamber 49 .

In this way, the band does not contact the rotating part of the gear with the handle.

In the free state, the band-shaped piece cooperates with an upper shoulder 51 of the annular groove of the head of the instrument to perform a first axial limitation of the instrument, the other axial limitation is provided by a gear of the handle rod. The flat part 52 ensures that said flat part 52 cooperates with the transverse end 53 of the instrument flat part.

The instrument is unlocked by applying two diametrically opposite pressures on the projection 42 , which are directed towards the axis of rotation. These two forces create an orthogonal force component that releases the instrument. Simultaneously pressing directly on the two ears of the strip (for example with thumb and forefinger) ensures fastening eg in the oral cavity with respect to the push button switch system. Due to the arrangement of a conical portion 64, which is implemented on the lower surface of the central region 39 of the strip, it is possible to connect the instrument without pressing the two ears of the strip, and the axial movement of the instrument expresses the tension of the strip through elastic action. With the radial movement performed, the strip recovers its shape to ensure the fastening effect.

A second embodiment of the fastening-loosening device will now be described with reference to FIGS. 8 to 10 .

The elastic band 25 having a rhomboid shape and a central zone 39 for fastening the instrument differs from the previous embodiment in that it has ears 54 forming lugs perpendicular to the The plane of the band is also located on the same side of this plane, with the difference that the elastic band is held axially and radially by a gear with a handle, as shown in FIGS. 8 to 9 .

to this end:

- The two ends of the band pass through two peripheral holes 61 arranged on the upper flange 62 of the gear with handle, diametrically opposed and arranged along a plane transverse to the drive shaft 6 ,

- The two ears 54 are locked in rotation by the two grooves 63 of said flange.

Furthermore, the head differs from the previous embodiment in that the plug is replaced by a push button switch 55 (for ease of manufacture) with for example a metal insert.

According to this embodiment, a pushbutton switch, for example made of PEEK, has several parts:

- an elastic ring 56, located at the lower end, which limits the axial freedom of the gear with the stem and holds the push button switch on the head 4,

- an intermediate elastic area 57, which acts as a return spring for said push button switch,

- a cylindrical inner insert 58 which can control the deformation of the elastic strip when pressing the push button switch, thereby releasing the appliance, for which reason pressing the push button switch 55 compresses its spring 57, and The inner taper 59 of the insert 58 mates with the complementary taper 60 of the strap ear. The radial force component occurring on the ear 54 of the strip causes a further radial deformation perpendicular to said primary force component. This deformation unlocks the instrument.

Insertion of the instrument into the head can be performed by pressing the pushbutton switch or not, in which case a tapered portion 64 on the lower surface of the central zone 39 of the band allows the insertion of the instrument.

The configuration of the band helps to ensure fastening by centrifugal action during rotation.

Push button switch concept

Miniaturization is an ongoing goal in the field of medical devices such as dental elbow heads. New materials such as thermoplastic or thermoset polymeric materials meet this desire. Known components can be rethought according to the mechanical, physical and chemical properties of these new materials, and this can reduce the number of components, increase the quality and reduce the cost of components; these plastic components can be machined or injected. Obviously, for dynamic instruments, these plastics, besides miniaturization, therefore also have lightness, sliding properties, good sterilization or disinfection properties, good elastic properties. Therefore, these plastics can be used in the manufacture of dental handpieces. The tightening or loosening control of the appliance is generally performed by applying a manual action on a push button switch on the head of the handpiece. According to the design, the pushbutton switch can be connected with a dynamic (rotation, vibration, etc...) device for example for endodontic treatment, and it is a fixed pushbutton switch independent of the dynamic device.

As an example, a handpiece head has been described above with a drill tail, as shown in FIGS. 2 and 3 .

Attention is drawn here to the fact that the body of the head 4 , integral or without the handle 3 , receives a rotating handle gear 20 which is driven in rotation by an output gear 23 of the handle. Thus, the gear with the stem has a rotational degree of freedom and an axial connection ensured, for example, by ball bearings.

Obviously, as shown in Figures 5 and 7, a solution without ball bearings could be considered, with smooth bearings embedded or integrated with the body of the head.

The transmission of the rotary movement of the drill is ensured by the engagement of the flat 36 implemented on the gear 4 of the shank and the flat 37 of the appliance. The axial stability of the appliance is ensured in one direction by the shoulder of the flat part of the gear with shank and the shoulder of the complementary flat part of the appliance.

From this common description, two pushbutton switches according to the invention can be distinguished, namely:

- A pushbutton connected to a dynamic device called a gripper , indicated with reference number 55 in Figures 3 and 16, the solution is characterized by a permanent contact between the rotating locking assembly and the pushbutton. In the rest state, the pushbutton switch 55 (for example made of PEEK) ensures axial restraint and centering of an elastic split ring 65 (for example made of PEEK) relative to the shaft 6 . The ring 65 is externally cylindrical and its inner wall has a conically inclined upper flange 71 , with a central portion in the form of a transverse shoulder 66 facing the shaft 6 . The shoulder 66 of the elastic ring 65 holds the instrument 5 in the axial direction by engaging in the annular neck 41 . The pushbutton switch 55 is radially guided in the bore 38 of the stem gear by one or more sectors or elements 87 arranged on the lower surface of the pushbutton 55 and each terminating in A tapered end for bearing on the elastic ring 65 . Axial movement of the push button switch 55 is limited between the upper and lower ends of one or more holes 68 implemented in the upper body of the gear with the stem and one or more hooks arranged on the lower surface of the push button. A piece 67 fits in said hole. The elastic ring 65 exerts an axial component force on the push button switch 55, thereby returning it to its original position. The hook 67 enables the push button switch to be clamped in the gear shank thanks to its radial elasticity caused by the slot 69 provided between the hook and the sector 87 . By pressing the push button switch 55 , the appliance 5 can be unlocked by means of a tapered portion 70 which engages into a complementary tapered slope 71 of the elastic ring to separate the shoulder 66 . The insertion of the instrument 5 in the gear with handle can be done automatically, without pressing a button, by means of the tapered portion 73 provided on the lower surface of the elastic ring at the end of the shoulder 66 .

As shown in Figure 3, the fastening-loosening part is an elastic ring that is opened along a radial plane shown in the sectional view of Figure 3 and has an opening, and the member for applying the loosening force is formed by a conical slope 71 .

A pushbutton switch independent of dynamic components

In terms of keeping the appliance in place, this solution is characterized in that the push button switch and the latch are separate.

Such an embodiment is shown by way of example in FIGS. 11 to 15 .

In the rest state, dynamic or not, and not acting on the push button switch, a tapered elastic annular jaw 72 holds the appliance 5 axially by means of its arms 73 (for example 6 arms), each of said arms 73 It ends in a shoulder 79 facing the axis 6 . The jaws 72 are connected to the rotating gear of the gear by means of the peripheral projections 74 of said jaws engaging in corresponding openings 76 formed on the gear of the gear. A slot 77 extending completely through the jaws provides the necessary radial elasticity to the jaws for installation in and removal of the jaws from the bore of the gear with shank.

The pushbutton switch 55 is axially held and centered in the opening 27 of the head by resilient tabs 75 cut in its cover; these resilient tabs, mounted under pressure in the head body, provide axial movement of the pushbutton switch. Elastic degrees of freedom (along axis 6). FIGS. 12 and 13 show said elastic strip 75 in a stressed state and show the clamping groove 80 at the end of the elastic strip for clamping the button 55 in the opening 27 . A manual axial push on the pushbutton is reacted by an axial movement of the tapered base 78 of the pushbutton to cooperate with the complementary cone 82 of the internal tapered chamber of the jaw arm; thus, the unlocking of the appliance This is ensured by the separation of the arms and the disengagement of the shoulder 79 . Release the manual pressing, the button switch returns to its initial position, and the respective cones of the two members 55 and 72 are no longer in contact.

According to this solution shown in FIGS. 11 to 15, the fastening-releasing means are elastic conical jaws 72, the shoulders 79 of which are adapted to engage in the grooves or annular necks 28 of the instrument, and The means for exerting the release force are formed by the inner cone 82 of the clamping jaw 72 , wherein the radial deformation of the clamping jaw is ensured by the slot 77 .

Lubrication concept

Figure 8 is an axial sectional view of Figure 9 showing that the head has a chamber 83 disposed around or beside the shank of the shank gear for containing a solid state lubricant This solid grease is released in small amounts through a hole 84 in the partition wall 85 between the chamber and the gear shank to lubricate said shank each time it is used.

installation concept

- Housing 8 can be molded in a single piece with plastic and thus electrically insulating material (eg PEEK) or with metal inclusions (eg by Metal Injection Molding - M.I.M for short) and electrically conductive sintered material or any other material Mode. The housing has:

- in the head, it has a first lumen 26 for mounting a gripper and an instrument along a drive shaft 6, said lumen leading to both sides of the head along two openings, wherein at least one of the openings, the opening 27, has dimensions adapted to allow insertion and assembly of all parts of the head,

- In said handle it has a second lumen 33 with a straight shaft 7 leading on the one hand through an opening 81 to the distal end of the handle and on the other hand at the proximal end of the head A side opening 32 leads into the first internal cavity 26 to enable cooperation between the mechanical parts of the head and the mechanical parts of the handle. Furthermore, the opening 81 is dimensioned such that all the components of the handle are inserted and mounted therein along a straight axis 7 called the arbor. To form an elbow piece, a housing is provided, the axes 6 and 9 of which form an angle, for example, between 90° and 180°, preferably between 100° and 130°, and to form a straight handpiece, it is possible to design Shafts 6 and 7 are parallel to each other and offset so as to leave an opening 27 in the head for fitting the internals and fitting in place a plug for a push button switch.

This concept is particularly advantageous because it can:

- reduce the number of bearings, or even eliminate them,

- reduce the cost of handpieces,

- reduce the size of the handpiece,

- easy to clean (smooth shape),

- Improved hygiene (one-piece, thus no contact surfaces).

Claims (30)

1. dental handpiece (1), it has mechanical parts, comprise the mechanical transmission elements chain that a clamp assembly and rotatablely moves, described clamp assembly wherein is used for a dental instruments fixing and driving rotation around a driving shaft (6), described mechanical parts are installed in the inside of the main body (2) with a head (4) and handle (3), it is characterized in that:

A) described main body (2) is that electric insulation housing (8) forms by a monomer spare, its part is as described handle (3), and another part constitutes a head, described head has one first inner chamber (26), described first inner chamber is connected with at least one opening (27), described opening (27) is sized to allow the parts of described head to insert and assemble within it, described handle has one second vertical inner chamber (33), described second vertical inner chamber has straight axle (7), lead to pommel by an opening (81) on the one hand, lead to described first inner chamber by a side opening (32) on the other hand, described opening (81) is sized to make the internal works of described handle to insert and assemble within it

B) in described handle, electric current conducts from a connection jack (11) that has motor by the mechanical transmission elements chain that rotatablely moves,

C) in described head (4), one gear (20) that is installed in the band handle bar on the driving shaft (6) has tooth (21), described tooth is meshed with the tooth (22) of an output gear (23) of handle, and the gear of band handle bar conducts electricity, and it is guaranteed and being electrically connected and Mechanical Driven of apparatus (5).

2. dental handpiece according to claim 1 is characterized in that, the axle (7) of axle of described head (6) and described handle forms a predetermined angle between them, thereby makes an elbow piece.

3. dental handpiece according to claim 2 is characterized in that, α is between 100 ° to 130 °.

4. dental handpiece according to claim 1 is characterized in that, the axle (7) of axle of described head (6) and described handle is parallel to each other and stagger, so that make handpiece always.

5. according to each described dental handpiece in the claim 1 to 4, it is characterized in that described housing (8) forms by molded.

6. dental handpiece according to claim 5 is characterized in that, described housing (8) is made with polymeric material.

7. dental handpiece according to claim 6 is characterized in that, described housing (8) is preferably made with PEEK.

8. handpiece according to claim 7 is characterized in that, described machinery and fax motivation part chain are constructed as follows:

-in described handle, electric current leads to an external stability collar of a clutch shaft bearing (12) from a jack (11), and lead to one first spring (13), an external stability collar that leads to one second bearing (14) that continues, lead to a collar (15) then by one first convex shoulder axial locking on the described housing (8), lead to a spring (16) again by one second convex shoulder axial locking of described housing (8), described first and second bearings (12,14) longitudinal axis (7) along described handle is first supporting one power transmission shaft of described handpiece (1), described spring (13 and 16) is the compression spring, its spiral coil externally is arranged on the described power transmission shaft (7)

-in the head (4) of described elbow piece, it is driving shaft (6) that described head has its second, described axle supporting two ball bearings, i.e. a upper bearing (metal) (17) and a lower bearing (18), the external collar of described upper bearing (metal) (17) matches with second spring (16) of described handle, the end play of described lower bearing (18) is eliminated by means of an elastic washer (19), the gear (20) of band handle bar is connected with the inner sleeve of described bearing, and it guarantees that power supply is to described apparatus (5) and Mechanical Driven thereof.

9. according to claim 6 or 7 described handpieces, it is characterized in that it has the electrical connector that is made of a lead.

10. according to claim 6 or 7 described handpieces, it is characterized in that it has electrical connector, have an elasticity and connect parts (88), with the electrical connection between the head that is used to guarantee described mechanical transmission elements and described utensil.

11. handpiece according to claim 10, it is characterized in that, described elasticity connects parts and has one first peripheral part (89) and one second peripheral part (91), described first peripheral part (89) wherein is bonded in the groove (90), this groove is implemented in the collar (15) of described bearing (14), and described second peripheral part (91) is relative with described first peripheral part, and is bearing on the head (40) of described apparatus.

12. handpiece according to claim 1, it is characterized in that, the inner chamber of described head (26) is suitable for admitting a clamp assembly of being made up of the mechanical transmission elements of described head, and be suitable for admitting a fastening-unlocking element (25) of described utensil or apparatus (5), described inner chamber leads on the described head by an opening (27), and described opening (27) can be by a plug or a lid (28) or by a press button obturation.

13. dental handpiece according to claim 1 is characterized in that, described head is equipped with a turbine, and the main body of described handpiece has the needed fluid slot of work.

14. dental handpiece according to claim 1, it is characterized in that described head has a chamber that is used to accommodate a solid lubrication fat, when using at every turn, described solid lubrication fat is disengaged by the hole on the wall of separating described chamber and described gear handle bar, so that lubricated described handle bar.

15. dental handpiece according to claim 1, it is characterized in that, it has a fixture, described fixture is fixed on a dental instruments on one clamp assembly, so that a dental instrument or apparatus are fixed and rotating drive around a driving shaft (6), described clamp assembly (24) is integrated on the head (4) of a dental handpiece, and be connected with a transmission component that is integrated in the handle (3) of described handpiece (1), and mainly by the elasticity of a band-like body form and deformable fastening-unlocking element (25) forms, described fastening-at least a portion of unlocking element has a cross section, this cross section is suitable for being bonded on one and is arranged in the cervical region or cannelure on described apparatus top, and be suitable for maintaining described apparatus by fastening, described fastening-unlocking element also has the member that is used to apply the power of unclamping, so that the cancellation fastening force, thereby unclamp described apparatus.

16. dental handpiece according to claim 15 is characterized in that, described fixture is dismountable with respect to described anchor clamps (24).

17. dental handpiece according to claim 15, it is characterized in that, the band-like body made from deformable and elastic material (25) has the shape of a parallelogram, and a middle section (39) arranged, this middle section is provided for the head (40) at the fastening described apparatus in a groove place, the big diagonal of described parallelogram body is designed to: its two ends exceed the housing of described head (4) by two lobe (42) on diameter, described each lobe is arranged in the groove (43) of described head, and described two lobe are configured for directly also manually applying the member of the power of unclamping on described band-like body.

18. dental handpiece according to claim 17 is characterized in that, described band-like body (25) has concave part (45), and described concave part is arranged near the lobe (42) and is bearing on the periphery (46) of an inner chamber (26) of described head.

19. dental handpiece according to claim 17, it is characterized in that, described elastic belt-shaped (25) that shape and with a parallelogram is used for the middle section (39) of fastening described apparatus have two ears (54), described ear forms lobe, perpendicular to the plane that is positioned at described band-like body and be positioned at this planar the same side, described two ears are configured for applying the member of the power of unclamping by being arranged in a press button on the described handpiece head.

20. dental handpiece according to claim 19 is characterized in that, described ear has tapered portion (60).

21. dental handpiece according to claim 17 is characterized in that, described band-like body has a tapered portion (64), and described tapered portion is implemented in the lower surface of described middle section (39).

22. dental handpiece according to claim 20 is characterized in that, described fixture also has a press button, and described press button is made up of a plurality of parts, that is:

-one elastic ring (56), it is positioned at the lower end, and described press button is remained on the described head (4),

Hookean region (57) in the middle of-one, it plays the back-moving spring of described press button,

Insert (58) in-one cylindricality, it can control described elastic belt-shaped distortion when pushing described press button, thereby releases out described utensil.

23. dental handpiece according to claim 22 is characterized in that, described insert (58) has an inner conical shape (59), matches with the tapered portion (60) of the ear of described band-like body being used for.

24. dental handpiece according to claim 15, it is characterized in that, described deformable and elastic band-like body have the shape of a split ring (65) or an open annular jaw (72), this split ring or open annular jaw have an annular convex shoulder (66) (79), this convex shoulder is suitable for being bonded in the annular neck portion (28) of described apparatus, and have a tapering part (71), match with a complementary tapering part of a press button being used for.

25. dental handpiece according to claim 24 is characterized in that, described split ring has a tapering part (73), and described tapering part is arranged on the lower surface of described split ring, is used for the insertion of described apparatus.

26. dental handpiece according to claim 25, it is characterized in that, described fixture also has a press button (55), described press button is by axially channeling conduct of one or more sectors (87), and described sector is arranged in lower surface and each all ends at a tapered end (70).

27. dental handpiece according to claim 25, it is characterized in that, described fixture also has a press button (55), described press button has a flexure strip (75) and a taper base portion (78), and described flexure strip wherein covers cutting at it and forms and end at holding tank (80).

28. dental handpiece according to claim 15 is characterized in that, described fixture also has a press button, be used for described fastening-apply the power of unclamping on the unlocking element.

29. dental handpiece according to claim 28 is characterized in that, described press button is connected with described anchor clamps.

30. dental handpiece according to claim 28 is characterized in that, described press button remains in the opening of described head by clamping.

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