An electrically driven device includes a housing, an electric motor with a drive shaft having a first rotary axis and a drive pin connected to the drive shaft eccentrically with respect to the rotary axis, and a driven shaft having a second rotary axis and mounted in the housing for performing a pivoting about the second rotary axis. The driven shaft is coupled to the drive shaft by a gear mechanism having a scotch yoke mechanism converting a rotary motion of the drive shaft into a reciprocating pivoting motion of the driven shaft. The scotch yoke mechanism includes a cross slider receiving the drive pin and having a sliding support extending perpendicular to the first rotary axis. The cross slider is guided in the housing by at least two elastically deformable elements. The driven shaft is coupled to the cross slider by a pivotable crank arm, converting a rotary motion of the drive shaft into a reciprocating of the driven shaft.

An electrically driven device includes a housing, an electric motor with a drive shaft having a first rotary axis and a drive pin connected to the drive shaft eccentrically with respect to the rotary axis, and a driven shaft having a second rotary axis and mounted in the housing for a pivoting about the second rotary axis. The driven shaft is indirectly coupled to the drive shaft by a gear mechanism converting a rotary motion of the drive shaft into a reciprocating pivoting motion of the driven shaft. The gear mechanism includes a cross slider having a sliding support extending perpendicular to the first rotary axis and receiving the drive pin. The cross slider is guided in the housing by a parallel lever in the form of a parallelogram by at least two pivotable links. The driven shaft is coupled to the cross slider by one of the said links, thereby converting a rotary motion of the drive shaft into a reciprocating pivoting of the driven shaft.

Different mechanical drive devices for a medical, dental or surgical tool are described that are designed to put the tool into an oscillating, rotational motion, wherein the oscillating, rotational motion comprises an alternating rotation of the tool by a first angle of rotation in a first rotational direction and by a second angle of rotation in a second rotational direction substantially opposed to the first rotational direction, wherein the first and second angles of rotation may have different values, so that during multiple sequential rotations in the first and second rotational directions, the tool cumulatively experiences a rotational motion in a preferred direction.

A wall portion of a dental handpiece accommodates a cam pin 111 with a cam hole 21 or a cam groove 211 designed so that the size of the cam hole 21 or the cam groove 211 is larger than the size of the cam pin 111 in each of the axial direction and the circumferential direction of a vibration cylinder 20. Therefore, a rotating member 110 is rotationally driven, and a vibrating force acts on the vibration cylinder 20 in the axial direction through the cam pin 111. In this manner, the vibration cylinder 20 vibrates or reciprocates in the axial direction with respect to a second cylindrical member 12, and vibrates or reciprocates in the circumferential direction. In addition, a needle portion 42 protruding from a through-hole 202 of the vibration cylinder 20 vibrates while being bent.

An electrically driven device includes a housing, an electric motor with a drive shaft having a first rotary axis and a drive pin connected to the drive shaft eccentrically with respect to the rotary axis, and a driven shaft having a second rotary axis and mounted in the housing for performing a pivoting about the second rotary axis. The driven shaft is coupled to the drive shaft by a gear mechanism including a scotch yoke mechanism converting a rotary motion of the drive shaft into a reciprocating motion of the driven shaft. The scotch yoke mechanism includes a cross slider having a sliding support extending perpendicular to the first rotary axis and receiving the drive pin either directly or through a sliding block with a bearing receiving the drive pin. The cross slider is guided in the housing by at least two pivotable links. The driven shaft is coupled to the cross slider by an arm, converting a rotary motion of the drive shaft into a reciprocating of the driven shaft.

A multi-directional handpiece that includes a motor drive extending along and configured for rotation about a body axis, the motor drive having: a motor gearing at a proximal end of the motor drive; and a file gearing in engagement with the motor gearing for transferring the rotational and axial movement to a workpiece; and a housing for the workpiece; and wherein through rotation of the motor drive, the workpiece moves in an axial oscillating motion while being rotated.

The present invention relates to a surgical dental tool for assisting with the implantation of a dental implant. The tool is designed to create an opening in a patient's jaw into which the dental implant will be inserted. In one embodiment, the tool includes a handle, a blade carrier, a pick and a blade stabilizing channel formed in at least a portion of the blade carrier and extends through at least a portion of the pick. The blade stabilizing channel receives and stabilizes a cutting blade. The blade carrier may include an adjustable clamping plate for removably securing the cutting blade in the blade stabilizing channel. The pick may include a sheath that receives and protects the tip of the cutting blade from breakage when the blade is in the blade stabilizing channel and is being used to cut a dental implant opening.

The present invention is concerned with an electric utility brush having a flexible drive shaft, and in particular an electric toothbrush having a substantially spherical head mounted on the flexible drive shaft and which can be driven rotationally in at least two different orientations in order to provide comprehensive brushing capabilities.

Dental hand piece, comprising a housing and a drive train with a coupling element for a drive, wherein the housing radially surrounds the drive train and wherein the housing has a first and a second housing end, and wherein the housing is held on the drive train on the first and on the second housing end. Between the first housing end and the coupling element is arranged a decoupling element, which is strictly springy or springy and damping in the axial direction, whereas the second housing end is braced rigidly against the drive train and the housing is braced with respect to the coupling element in the axial direction by means of the decoupling element.

A hand instrument, comprising: a tool-holding device for fastening a treatment tool on the hand instrument, a driveshaft for transmitting a driving movement to the tool-holding device and a stroke gear which is designed to induce the tool-holding device in a stroke movement. According to a first embodiment the hand instrument further has a rotary gear which is designed to induce the tool-holding device to a rotational movement, wherein a drive-side element of the rotary gear and a drive-side element of the stroke gear are arranged jointly on the driveshaft. According to a second embodiment the drive-side element of the stroke gear is designed such, that in a complete revolution of the drive-side element of the stroke gear the tool-holding device runs through more than a double stroke. According to another embodiment the drive-side element of the stroke gear is disposed concentrically around an axis of rotation of the driveshaft.