The present invention relates to a chucking device for a drilling tool for a dental handpiece, as well as a handpiece for dental or surgical applications comprising: —a head (10) in which is inserted in removable fashion a drilling tool (100) able to be actuated in rotation about an axis of rotation (R) by means of a drive mechanism comprising a drive shaft (2) rotating about this axis of rotation (R)—a clamping device for the drilling tool (100), comprising a chucking clamp (4) disposed inside said drive shaft (2) for axial retention of the drilling tool (100) with respect to the axis of rotation (R), the clamp (4) co-operating with a plunger (5), and—a push-button (61) arranged to act upon the plunger (5) in order to release the drilling tool (100); The handpiece (1) contains a permanent magnet (7) arranged symmetrically around the axis of rotation (R) and exerting a force of magnetic attraction (F) on the plunger (5) in direction of the push-button (61).

The present invention relates to a transmission rotor for a handpiece (1) suitable to dental or chirurgical applications, comprising a device for clamping a drilling tool (100), able to be actuated in rotation about an axis of rotation (R) by means of a drive mechanism which comprises a drive shaft (2) rotatable about the said axis of rotation (R).

The clamping device comprises a clamp (4) disposed inside the drive shaft (2) for axially securing the drilling tool (100) with respect to the axis of rotation (R), the clamp (4) co-operating with a plunger (5) for releasing the drilling tool (100), as well as a radial guide bush (3) of the drilling tool, rotating integrally with the drive shaft (2), and wherein it comprises a selective angular coupling mechanism (C.sub.s) between the clamp (4) and the guide bush (3) or the drive shaft (2) directly, according to the chosen preferred embodiment; the selective angular coupling mechanism (C.sub.s) exerting an angular holding torque (C) between the clamp (4) and the guide bush (3) or respectively the drive shaft (2), the value of which being inferior to that corresponding to the slip threshold between the said clamp (4) and the drilling tool (100).

Provided is a dental handpiece which can prevent degradation in visibility of a surgical field. The anti-reflection layer 100 is formed on the top surface and the side surface of the head portion 241 of the lid member 24 close to the root canal of the tooth, to which the operator pays attention, and further on the outer surface of the second cylindrical member 12 (refer to FIG. 3). Therefore, the reflection of light of a dental lighting tool provided with the anti-reflection layer 100 is suppressed, and degradation in visibility of a surgical field can be avoided. In addition, visibility of stains such as proteins adhering to the lid member 24 and the second cylindrical member 12 is improved, and cleaning thereof is facilitated.

A fixing structure of a dental handpiece has a transmission assembly for connecting a handpiece head, a positioning sleeve sleeved onto the transmission assembly and having a positioning member thereon, and a casing composed of a front casing and a rear casing. The front casing is sleeved onto the positioning sleeve. The rear casing is detachably connected to one end of the front casing. The front casing is provided with a push member. The push member is inserted inwardly to lean against the positioning member for the positioning member to be tightly pressed against an outer circumferential surface of the transmission assembly so that the front casing, the positioning sleeve and the transmission assembly are fixed and connected together.

A hand-held surgical device, particularly for use in oral surgery, includes a rotatable tool, a head of the tool having a hollow-cylindrical design, and an active region, particularly for machining bones, being arranged at a distal edge of the head. A protection device is arranged which partially surrounds the distal edge of the tool and in some sections extends in the axial direction beyond the distal edge such that only a circular arc of the distal edge serves as the active region. The protection device may have a connecting element for detachably securing to the hand-held surgical device.

The invention relates to a dental handpiece with a manually operable push button for actuating the trigger mechanism, wherein the push button is double-walled with an outer cover plate and an inner contact element, wherein for actuating the push button an upper side of the outer cover plate is pressable by a user against a bias, thereby actuating an actuator by an underside of the inner contact element to actuate the trigger mechanism, wherein a thermal insulation layer extends between the outer cover plate and the inner contact element which causes a thermal decoupling of the outer cover plate from the inner contact element.

A dental handpiece includes a barrel, an air turbine, a central shaft, a bearing and a seal. The barrel includes an axial open end. The air turbine is rotatably provided in the barrel. The central shaft is secured to the air turbine to rotate with the air turbine. The bearing is mounted in the barrel and supports the central shaft for rotation. The seal is trumpet-shaped and arranged between the open end of the barrel and the bearing. The seal includes a sealing portion sleeved over an outer cylindrical surface of the central shaft. The sealing portion is deformable to separate from the outer cylindrical surface of the central shaft or closely contact the outer cylindrical surface of the central shaft depending on a pressure difference between interior and exterior of the barrel.

An endodontic handpiece comprises a handle assembly and an endodontic tool. The handle assembly comprises a handle housing, a chuck assembly, a bearing system for supporting the chuck assembly for rotation relative to the handle housing, a first drive system for rotating the chuck assembly, and first and second drive systems. The endodontic tool defines a support portion and a working portion. The chuck assembly transfers movement of the chuck assembly to the endodontic tool. The endodontic handpiece operates in at least one of first, second, and third modes in which the first drive system causes rotation of the endodontic tool through the chuck assembly, the second drive system causes vibration of the endodontic tool, and/or the first drive system causes rotation of the endodontic tool through the chuck assembly.

A subassembly for a dental care or surgical handpiece comprises a push button (16) comprising a contact surface (23) adapted to receive a manual pressure able to actuate the push button (16) slidably in a sliding direction. This subassembly further comprises a piece (21) for retaining the push button (16), as well as a bayonet device (28a, 33, 35) able to keep assembled the push button (16) and the retaining piece (21).

A handle system for supporting a tool defining a tool axis during the performance of dental procedures comprises a handle defining a handle axis, a rotation sleeve, a head assembly and a gear set comprising first and second gear portions. The rotation sleeve supports the first gear portion. The head assembly supports the second gear portion. The handle supports the rotation sleeve for rotation relative to the handle. The handle supports the head assembly such that the first gear portion engages the second gear portion. With the head assembly supported by the handle, the head assembly engages the tool to support the tool such that the tool axis extends at a first angle relative to the handle axis and rotation of the rotation sleeve relative to the handle causes axial rotation of the tool about the tool axis.