A chuck mechanism for a dental handpiece holds a columnar rotary tool for dental care rotatably with an annular rotor of the dental handpiece. The columnar rotor tool is concentrically detachable to the annular rotor which is rotatably attached to a head part of the dental handpiece. The chuck mechanism has an annular chucking member with a cylindrical base part into which the annular rotor is integrally fitted and an elastic chucking piece having a chucking pawl for engaging with a locking groove formed at a base end of the rotary tool. The chuck mechanism enables the rotary tool to be easily removed from the annular rotor by elastically deforming the elastic chucking piece against elastic force of the elastic chucking piece to disengage the chucking pawl from the locking groove.

The invention relates to a clamping device (1) for clamping a cylindrical instrument shank, in particular, a dental instrument, said clamping device comprising a spring-loaded element (2) for holding the instrument shank, a hollow shaft (3) for transmitting a rotational movement, and a plunger, wherein the spring-loaded element (2) is designed as a sleeve with a cylindrical wall, a first opening (6) and a second opening (7); and the wall has cut-outs (8). The spring-loaded element (2), the shaft (3) and the plunger (4) have axes of rotation that are arranged coaxially; the shaft (3) protrudes at least partially into the first opening (6) of the spring-loaded element (2); and the plunger (4) protrudes at least partially into the second opening (7) of the spring-loaded element (2).

A chuck assembly for a dental handpiece includes a hollow cylindrical tube portion having a first internal bore, and a chuck portion having a second bore. The chuck portion is supported within the first bore co-rotational with the tube portion about a common axis. The chuck portion has an annular body portion defining the second bore for supporting a cylindrical tool therein. A drive element comprising a drive pin inserted in a first end of the tube portion traverses the first internal bore at a first end of the tube portion. The drive pin cooperates with a distal end of a rotary tool insertable into the second bore to transfer torque to the tool. The tool has an elongated body portion having a driven portion and a working portion. The driven portion includes a shank portion with channels for receiving the drive pin.

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), anda 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).

A disposable prophy angle is provided, the prophy angle comprising a housing containing a drive shaft and a driven shaft; the drive shaft having a proximal end and a distal end and a longitudinal axis therebetween, the distal end having a substantially conical driving portion and a projection, the proximal end of the drive shaft configured to engage a dental hand piece; and the driven shaft having a driven portion comprising a recess configured for engagement by the projection and/or the substantially conical portion of the drive shaft to oscillate the driven shaft at an oscillation angle greater than 90 degrees. In some embodiments, there is a method of making a disposable prophy angle by overmolding a prophy cup to the prophy angle. In other embodiments, there is a method of using the prophy angle to prevent tooth decay.

A clamping structure is assembled in a handpiece. The clamping structure includes a connecting member for clamping a dental tool and a controlling member. Two or more clamping portions are disposed on the connecting member, and a distance between the clamping portions is changeable due to a control over the clamping portions. The controlling member corresponds to the connecting member and is abutted against the clamping portions. The controlling member can be moved relative to the clamping portions to form the control over the clamping portions so as to allow the clamping portions to clamp or to release the dental tool. A tungsten carbide coating layer is disposed on a contact surface of the controlling member, contact surfaces of the clamping portions, or both.

A piece of mechanized surgical equipment is provided, which includes an instrument holder having an element for receiving and retaining a surgical instrument for mechanized use. Also provided is a surgical instrument for mechanized use and configured to be mounted on the instrument holder. The element for receiving and retaining is mobile between an unlocking position, in which the element enables insertion of the instrument into the instrument holder or withdrawal thereof, and a locking position, in which the element prevents the withdrawal of the instrument from the instrument holder. Furthermore, the equipment includes a case in which an active blade of the instrument can be removably housed, the case having an engaging element for engaging with the receiving and retaining element so as to cause the element to move from the unlocking position to the locking position, or vice versa.

A dental prophylaxis tool handpiece includes a motor section having a first connector; a sleeve section having a second connector with a first end extending over a portion of the motor section and engaging a prophylaxis tool at a second end; the first and second connector configured for engagement with each other and configured to limit relative axial movement of the sleeve section relative to the motor section while allowing for free rotational movement of the sleeve section relative to the motor section; and upon engagement of the sleeve section with the motor section, a portion of the motor portion is covered to substantially isolate the portion of the motor section from contaminants. Other embodiments incorporate a positive air pressure feature and/or an ozone generator. Associated methods of preventing contamination of at least a distal portion of a motor section of a prophylaxis tool handpiece are also described.

Disclosed is a rotatable ultrasonic vibration device. The ultrasonic vibration device includes: a shell; a hollow locking rod having a center hole; a piezoelectric transducer surrounding the hollow locking rod; a first amplitude-change pole mounted in the center hole, one end of the first amplitude-change pole being fixedly connected to the hollow locking rod, and at least a portion of the length of the first amplitude-change pole being located in the space surrounded by the piezoelectric transducer; an instrument rod connected to the other end of the first amplitude-change pole, an instrument working portion being located outside the shell and connected to the instrument rod, and the instrument rod being rotatable relative to the first amplitude-change pole; and a rotation transmission assembly rotatably mounted on the shell and matched with the instrument rod to transmit rotation torque to the instrument rod.

A handpiece suitable for dental or chirurgical applications, including a device for clamping a drilling tool, able to be actuated in rotation about an axis of rotation by a drive mechanism. The drive mechanism has a drive shaft rotatable about the said axis of rotation. The clamping device includes a clamp disposed inside the drive shaft for axially securing the drilling tool with respect to the axis of rotation, the clamp co-operating with a plunger for releasing the drilling tool, as well as a radial guide bush of the drilling tool, rotating integrally with the drive shaft. A selective angular coupling mechanism exerting an angular holding torque between the clamp and the guide bush or respectively the drive shaft, the value of which being inferior to that corresponding to the slip threshold between the said clamp and the drilling tool.